Article(id=1241321701208814448, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241321691524158287, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-6099.2025.02.004, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1728662400000, receivedDateStr=2024-10-12, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773883756210, onlineDateStr=2026-03-19, pubDate=1743436800000, pubDateStr=2025-04-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773883756210, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773883756210, creator=13701087609, updateTime=1773883756210, updator=13701087609, issue=Issue{id=1241321691524158287, tenantId=1146029695717560320, journalId=1235980550691926019, year='2025', volume='45', issue='2', pageStart='1', pageEnd='204', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773883753901, creator=13701087609, updateTime=1773884632018, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241325374676726363, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241321691524158287, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241325374676726364, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241321691524158287, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=20, endPage=25, ext={EN=ArticleExt(id=1241321701607273374, articleId=1241321701208814448, tenantId=1146029695717560320, journalId=1235980550691926019, language=EN, title=Application of INRBO-SVM Model in Predicting Slope Safety Factors, columnId=1236276106018484431, journalTitle=Mining and Metallurgical Engineering, columnName=MINING, runingTitle=null, highlight=null, articleAbstract=

Aiming at addressing the difficulty in selecting parameters for the support vector machine (SVM) model in predicting slope safety factors, a Newton-Raphson Backtracking Optimization (NRBO) algorithm was optimized to assist the SVM model in rapidly selecting appropriate hyperparameters. The NRBO algorithm was improved by introducing a dynamic opposition-based learning strategy, horizontal and vertical crossover strategies, and a modified adaptive coefficient calculation formula, so as to construct an INRBO-SVM model for predicting slope safety factors. Six factors, including bulk density, cohesion, internal friction angle, slope angle, slope height and pore water pressure ratio, were selected as model inputs, with the safety factor as the output. The trained INRBO-SVM model, NRBO-SVM model, SVM model and RBF model were used to predict the safety factors of nine test samples. The results show that the INRBO-SVM model exhibits the best performance in safety factor prediction, with a correlation coefficient of 0.999 9, higher than those of the other models. Its root-mean-square error and mean absolute error are significantly lower than those of the other models. Engineering application results indicate that the prediction errors of the INRBO-SVM model for safety factors are all less than 10%, with most below 5%, confirming the accuracy and practical application value of the model in predicting safety factors.

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针对支持向量机(SVM)模型在预测边坡安全系数中选取参数困难的问题,优化牛顿-拉夫逊算法(NRBO)帮助SVM模型快速选取适当的超参数。引入动态反向学习策略、横向与纵向交叉策略和修正自适应系数计算公式对NRBO算法进行改进,构建INRBO-SVM边坡安全系数预测模型。选取容重、黏聚力、内摩擦角、边坡角、边坡高度和孔隙水压比6个因素为模型输入,安全系数为输出,将训练后的INRBO-SVM模型、NRBO-SVM模型、SVM模型、RBF模型对9组测试样本进行安全系数预测。结果表明:INRBO-SVM模型安全系数预测性能最好,相关系数R2为0.999 9,高于其他模型;均方根误差和平均绝对误差均显著低于其他模型。工程应用结果表明,INRBO-SVM模型的安全系数预测误差均小于10%,大部分低于5%,证实了该模型预测安全系数的准确性以及实际应用价值。

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熊朝林(1998—),男,云南昭通人,硕士研究生,主要研究方向为岩土安全。E-mail:

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熊朝林(1998—),男,云南昭通人,硕士研究生,主要研究方向为岩土安全。E-mail:

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Optimization study of slope stability prediction model based on machine learning[D]. Kunming: Kunming University of Science and Technology, 2023., articleTitle=Optimization study of slope stability prediction model based on machine learning, refAbstract=null)], funds=[Fund(id=1241327683645264229, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, awardId=U1602232, language=CN, fundingSource=国家自然科学基金联合项目(U1602232), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241327675067913004, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, xref=1., ext=[AuthorCompanyExt(id=1241327675093078829, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, companyId=1241327675067913004, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1.Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China), 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figureFileSmall=JNCEPi9yAUKF/DMbIew1kA==, figureFileBig=hBcq19T3IS+kN82ziWKQxA==, tableContent=null), ArticleFig(id=1241327679627120734, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=图2, caption=特征皮尔逊相关性热图, figureFileSmall=JNCEPi9yAUKF/DMbIew1kA==, figureFileBig=hBcq19T3IS+kN82ziWKQxA==, tableContent=null), ArticleFig(id=1241327679748755559, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Fig.3, caption=Construction steps of INRBO-SVM model, figureFileSmall=MCUHzL4a1w4Dc9Ay/gJw1g==, figureFileBig=KG5qgY+s8nl+Hmoz/8EIfw==, tableContent=null), ArticleFig(id=1241327679891361914, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=图3, caption=INRBO-SVM模型构建步骤, figureFileSmall=MCUHzL4a1w4Dc9Ay/gJw1g==, figureFileBig=KG5qgY+s8nl+Hmoz/8EIfw==, tableContent=null), ArticleFig(id=1241327679996219525, 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language=CN, label=图5, caption=INRBO-SVM模型预测结果与实际值对比, figureFileSmall=BxxxSXK8oe3D34/DE4gH+Q==, figureFileBig=VWV7ydPOzrhCOOUT7GqWzQ==, tableContent=null), ArticleFig(id=1241327680398872763, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Fig.6, caption=Comparison between predicted values by each model and actual values of safety factor, figureFileSmall=WhwPbhm6JoC6sQeQIEpleQ==, figureFileBig=12EquR+rDiMUUKCED9fxYw==, tableContent=null), ArticleFig(id=1241327680549867718, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=图6, caption=各模型安全系数预测值与实际值对比, figureFileSmall=WhwPbhm6JoC6sQeQIEpleQ==, figureFileBig=12EquR+rDiMUUKCED9fxYw==, tableContent=null), ArticleFig(id=1241327682013679828, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Fig.7, caption=IAE of predicted results of different models, figureFileSmall=5tLR9U89G32LOGBA5k9N4Q==, figureFileBig=hOPsH3wdUW9Rt2wtcCZfmw==, tableContent=null), ArticleFig(id=1241327682118537440, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=图7, caption=各模型预测结果的IAE

(a)INRBO-SVM模型;(b)NRBO-SVM模型;(c)SVM模型;(d)RBF模型

, figureFileSmall=5tLR9U89G32LOGBA5k9N4Q==, figureFileBig=hOPsH3wdUW9Rt2wtcCZfmw==, tableContent=null), ArticleFig(id=1241327682223395054, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Table 1, caption=

Test results of benchmark function

, figureFileSmall=null, figureFileBig=null, tableContent=
函数名称指标INRBONRBOPSOSSAWOA
f1Sphere平均值1.176×10-2772.869×10-2823.430×1026.734×10-553.032×10-76
标准差001.716×1022.860×10-549.918×10-76
最优值01.694×10-2978.096×1014.872×10-1906.842×10-87
f2Schwefel 2.22平均值1.161×10-1686.940×10-1411.523×1011.550×10-347.703×10-51
标准差02.513×10-1407.8965.458×10-343.754×10-50
最优值4.459×10-2104.167×10-1486.73301.829×10-59
f3Quartic平均值3.978×10-52.510×10-42.0721.638×10-33.558×10-3
标准差2.617×10-52.493×10-44.5861.678×10-34.125×10-3
最优值5.854×10-78.609×10-65.601×10-21.186×10-41.579×10-4
f4Schwefel's Problem 2.26平均值-1.257×104-4.912×103-7.508×103-8.526×103-1.012×104
标准差1.940×10-127.752×1027.448×1027.579×1021.989×103
最优值-1.257×104-7.084×103-9.332×103-1.057×104-1.257×104
f5Griewank's平均值1.571×10-322.754×10-15.8382.801×10-122.458×10-2
标准差5.567×10-488.083×10-22.6097.709×10-122.599×10-2
最优值1.571×10-321.567×10-11.6887.647×10-167.971×10-3
f6Kowalik's平均值3.380×10-41.255×10-35.832×10-33.326×10-48.347×10-4
标准差1.672×10-43.633×10-37.780×10-37.676×10-55.619×10-4
最优值3.075×10-43.075×10-47.959×10-43.075×10-43.168×10-4
), ArticleFig(id=1241327682386972921, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=表1, caption=

基准函数测试结果

, figureFileSmall=null, figureFileBig=null, tableContent=
函数名称指标INRBONRBOPSOSSAWOA
f1Sphere平均值1.176×10-2772.869×10-2823.430×1026.734×10-553.032×10-76
标准差001.716×1022.860×10-549.918×10-76
最优值01.694×10-2978.096×1014.872×10-1906.842×10-87
f2Schwefel 2.22平均值1.161×10-1686.940×10-1411.523×1011.550×10-347.703×10-51
标准差02.513×10-1407.8965.458×10-343.754×10-50
最优值4.459×10-2104.167×10-1486.73301.829×10-59
f3Quartic平均值3.978×10-52.510×10-42.0721.638×10-33.558×10-3
标准差2.617×10-52.493×10-44.5861.678×10-34.125×10-3
最优值5.854×10-78.609×10-65.601×10-21.186×10-41.579×10-4
f4Schwefel's Problem 2.26平均值-1.257×104-4.912×103-7.508×103-8.526×103-1.012×104
标准差1.940×10-127.752×1027.448×1027.579×1021.989×103
最优值-1.257×104-7.084×103-9.332×103-1.057×104-1.257×104
f5Griewank's平均值1.571×10-322.754×10-15.8382.801×10-122.458×10-2
标准差5.567×10-488.083×10-22.6097.709×10-122.599×10-2
最优值1.571×10-321.567×10-11.6887.647×10-167.971×10-3
f6Kowalik's平均值3.380×10-41.255×10-35.832×10-33.326×10-48.347×10-4
标准差1.672×10-43.633×10-37.780×10-37.676×10-55.619×10-4
最优值3.075×10-43.075×10-47.959×10-43.075×10-43.168×10-4
), ArticleFig(id=1241327682533773572, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Table 2, caption=

Original sample database

, figureFileSmall=null, figureFileBig=null, tableContent=
容重/(kN·m-3黏聚力/MPa内摩擦角/(°)边坡角/(°)边坡高度/m孔隙水压比安全系数
18.52503060.151.09
254635474430.251.28
25553645.52990.251.52
27403547.12920.251.15
273535423590.251.27
1039.8120.360.9832.50.701.01
5045200360.250.79
2003645500.250.79
19303535110.202.00
19.6311.97202212.190.4051.35
254635474430.251.28
), ArticleFig(id=1241327682672185615, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=表2, caption=

原始样本数据库

, figureFileSmall=null, figureFileBig=null, tableContent=
容重/(kN·m-3黏聚力/MPa内摩擦角/(°)边坡角/(°)边坡高度/m孔隙水压比安全系数
18.52503060.151.09
254635474430.251.28
25553645.52990.251.52
27403547.12920.251.15
273535423590.251.27
1039.8120.360.9832.50.701.01
5045200360.250.79
2003645500.250.79
19303535110.202.00
19.6311.97202212.190.4051.35
254635474430.251.28
), ArticleFig(id=1241327682798014749, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Table 3, caption=

Relative errors of different models

, figureFileSmall=null, figureFileBig=null, tableContent=
样本编号INRBO-SVMNRBO-SVMSVMRBF
10.151.524.114.13
20.090.902.0615.08
30.142.622.417.64
40.181.323.1224.70
50.181.863.0240.02
60.110.851.884.98
70.181.8415.5725.16
80.691.160.728.05
90.171.552.9519.99
), ArticleFig(id=1241327682911260965, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=表3, caption=

各模型相对误差

, figureFileSmall=null, figureFileBig=null, tableContent=
样本编号INRBO-SVMNRBO-SVMSVMRBF
10.151.524.114.13
20.090.902.0615.08
30.142.622.417.64
40.181.323.1224.70
50.181.863.0240.02
60.110.851.884.98
70.181.8415.5725.16
80.691.160.728.05
90.171.552.9519.99
), ArticleFig(id=1241327683037090099, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Table 4, caption=

Evaluation metrics of different models

, figureFileSmall=null, figureFileBig=null, tableContent=
模型R2RMSEMAE
INRBO-SVM0.999 90.003 70.002 6
NRBO-SVM0.996 30.018 80.017 9
SVM0.962 90.058 10.043 4
RBF0.763 80.146 40.120 9
), ArticleFig(id=1241327683141947707, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=表4, caption=

不同模型的评价指标

, figureFileSmall=null, figureFileBig=null, tableContent=
模型R2RMSEMAE
INRBO-SVM0.999 90.003 70.002 6
NRBO-SVM0.996 30.018 80.017 9
SVM0.962 90.058 10.043 4
RBF0.763 80.146 40.120 9
), ArticleFig(id=1241327683234222404, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=EN, label=Table 5, caption=

Comparison of predicted results

, figureFileSmall=null, figureFileBig=null, tableContent=
编号容重/(kN·m-3黏聚力/MPa内摩擦角/(°)边坡角/(°)边坡高度/m孔隙水压力原始安全系数安全系数预测值相对误差/%
126.8120035581380.251.551.551 50.09
226.5730038.745.3800.150.9720.970 80.12
326.7830038.7541550.250.700.688 61.63
431.36837463660.251.351.328 61.59
520.4133.52111645.720.200.940.858 78.65
620.9634.9627.9940.02120.501.891.961 33.77
727263150920.251.791.841 32.86
820.4124.9132210.670.351.671.661 40.52
9182430.1545200.120.9410.967 32.80
1018.8414.36252030.50.450.780.831 46.59
), ArticleFig(id=1241327683343274319, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241321701208814448, language=CN, label=表5, caption=

预测结果对比

, figureFileSmall=null, figureFileBig=null, tableContent=
编号容重/(kN·m-3黏聚力/MPa内摩擦角/(°)边坡角/(°)边坡高度/m孔隙水压力原始安全系数安全系数预测值相对误差/%
126.8120035581380.251.551.551 50.09
226.5730038.745.3800.150.9720.970 80.12
326.7830038.7541550.250.700.688 61.63
431.36837463660.251.351.328 61.59
520.4133.52111645.720.200.940.858 78.65
620.9634.9627.9940.02120.501.891.961 33.77
727263150920.251.791.841 32.86
820.4124.9132210.670.351.671.661 40.52
9182430.1545200.120.9410.967 32.80
1018.8414.36252030.50.450.780.831 46.59
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INRBO-SVM模型在边坡安全系数预测中的应用
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熊朝林 1 , 陈俊智 2
矿冶工程杂志 | 采矿 2025,45(2): 20-25
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矿冶工程杂志 | 采矿 2025, 45(2): 20-25
INRBO-SVM模型在边坡安全系数预测中的应用
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熊朝林1 , 陈俊智2
作者信息
  • 1.昆明理工大学 公共安全与应急管理学院,云南 昆明 650093
  • 2.昆明理工大学 国土资源工程学院,云南 昆明 650093
  • 熊朝林(1998—),男,云南昭通人,硕士研究生,主要研究方向为岩土安全。E-mail:

Application of INRBO-SVM Model in Predicting Slope Safety Factors
Chaolin XIONG1 , Junzhi CHEN2
Affiliations
  • 1.Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
  • 2.Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
出版时间: 2025-04-01 doi: 10.3969/j.issn.0253-6099.2025.02.004
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针对支持向量机(SVM)模型在预测边坡安全系数中选取参数困难的问题,优化牛顿-拉夫逊算法(NRBO)帮助SVM模型快速选取适当的超参数。引入动态反向学习策略、横向与纵向交叉策略和修正自适应系数计算公式对NRBO算法进行改进,构建INRBO-SVM边坡安全系数预测模型。选取容重、黏聚力、内摩擦角、边坡角、边坡高度和孔隙水压比6个因素为模型输入,安全系数为输出,将训练后的INRBO-SVM模型、NRBO-SVM模型、SVM模型、RBF模型对9组测试样本进行安全系数预测。结果表明:INRBO-SVM模型安全系数预测性能最好,相关系数R2为0.999 9,高于其他模型;均方根误差和平均绝对误差均显著低于其他模型。工程应用结果表明,INRBO-SVM模型的安全系数预测误差均小于10%,大部分低于5%,证实了该模型预测安全系数的准确性以及实际应用价值。

边坡稳定性  /  预测模型  /  安全系数  /  SVM模型  /  INRBO算法  /  机器学习

Aiming at addressing the difficulty in selecting parameters for the support vector machine (SVM) model in predicting slope safety factors, a Newton-Raphson Backtracking Optimization (NRBO) algorithm was optimized to assist the SVM model in rapidly selecting appropriate hyperparameters. The NRBO algorithm was improved by introducing a dynamic opposition-based learning strategy, horizontal and vertical crossover strategies, and a modified adaptive coefficient calculation formula, so as to construct an INRBO-SVM model for predicting slope safety factors. Six factors, including bulk density, cohesion, internal friction angle, slope angle, slope height and pore water pressure ratio, were selected as model inputs, with the safety factor as the output. The trained INRBO-SVM model, NRBO-SVM model, SVM model and RBF model were used to predict the safety factors of nine test samples. The results show that the INRBO-SVM model exhibits the best performance in safety factor prediction, with a correlation coefficient of 0.999 9, higher than those of the other models. Its root-mean-square error and mean absolute error are significantly lower than those of the other models. Engineering application results indicate that the prediction errors of the INRBO-SVM model for safety factors are all less than 10%, with most below 5%, confirming the accuracy and practical application value of the model in predicting safety factors.

slope stability  /  prediction model  /  safety factor  /  SVM model  /  INRBO algorithm  /  machine learning
熊朝林, 陈俊智. INRBO-SVM模型在边坡安全系数预测中的应用. 矿冶工程杂志, 2025 , 45 (2) : 20 -25 . DOI: 10.3969/j.issn.0253-6099.2025.02.004
Chaolin XIONG, Junzhi CHEN. Application of INRBO-SVM Model in Predicting Slope Safety Factors[J]. Mining and Metallurgical Engineering, 2025 , 45 (2) : 20 -25 . DOI: 10.3969/j.issn.0253-6099.2025.02.004
边坡稳定性是岩土工程领域的研究重点,目前,学者们主要采用机器学习方法预测边坡稳定性,常见的机器学习方法有BP神经网络、决策树(DT)、随机森林(RF)、径向基函数(RBF)神经网络、最小二乘支持向量机(LSSVM)以及支持向量机(SVM)等。BP神经网络对高度非线性回归预测问题具有较强的适应性,但依赖初始权值,容易收敛到局部最优[1],导致一定误差。DT模型可以预测连续变量,便于理解和解释[2],但对数据比较敏感,存在过拟合情况,输入数据微小变化就可能导致预测值与实际值存在较大误差,有时无法得到全局最优结果。RF模型是一种集成学习方法,能克服DT模型中经常出现的过拟合问题,但在一定程度上也失去了其内在可解释性[3],同时可能无法预测连续变量中的极值。RBF模型的收敛速度比BP神经网络快,同时也具有较强的非线性逼近能力[4],但其中心点数量和位置的变换对性能影响较大,存在过拟合的风险。SVM模型泛化能力强,适合小样本数据,弥补了BP神经网络、RF模型、DT模型以及RBF模型泛化能力容易受影响的缺点,但在使用过程中其模型超参数(最优核函数和惩罚因子)的选取比较困难,而这两个参数对模型的性能影响较大[5-6]。LSSVM模型是在SVM模型基础上,通过将二次规划问题中的不等式约束转换为等式约束,并采用最小二乘损失函数发展而来,保留了SVM模型的泛化优势,但其最小二乘损失对异常值较为敏感,因而导致其鲁棒性比传统SVM模型弱。
鉴于SVM模型参数选取困难的问题,学者们探索采用优化算法来帮助SVM模型快速选取适当的超参数[7],本文采用改进的牛顿-拉夫逊算法(INRBO)来寻找SVM模型的最优核函数和惩罚因子,构建了INRBO-SVM边坡安全系数预测模型,并与NRBO-SVM、SVM以及RBF模型的预测结果进行了对比;将INRBO-SVM模型应用于边坡工程案例中,验证了该模型在预测边坡安全系数方面具有较高的准确性和实用性。
牛顿-拉夫逊算法(Newton-Raphson method,NRBO)是一种寻找方程根的元启发式优化算法[8],其主要包括种群初始化、牛顿-拉夫逊搜索规则(NRSR)以及陷阱避免操作(TAO)三个阶段,该算法创新性地将牛顿-拉夫逊数值方法与群体智能搜索进行结合,在算法搜索过程中引入自适应系数δ,有助于搜索过程中的平衡与开发,同时加入陷阱避免操作,帮助算法跳出局部最优。但是,原算法还存在以下缺点:①种群的多样性可能会快速丧失,导致过早收敛;②自适应系数δ在算法中的动态适应性较差;③算法一旦陷入局部最优就很难跳出,导致算法的收敛性以及适用性较弱。因此,提出以下改进策略:首先,在算法的初始阶段引入动态反向学习策略,并将其贯穿于算法的整个迭代循环过程;其次,对自适应系数δ进行修改,增强其动态适应性,从而更好地控制种群位置更新幅度,实现从探索到开发的平稳过渡;最后,在算法中增加横向与纵向交叉策略,以增强种群多样性,避免算法由于陷入局部最优而过早收敛,从而提高算法的整体性能。
为了避免算法过早丧失种群多样性,增强种群对搜索空间中未知区域的探索能力,本文引入动态反向学习策略。该策略不仅在种群初始阶段中使用,还在算法的每次迭代后期使用,从而持续增强种群的多样性,提高算法跳出局部最优的能力。该策略计算公式为:
式中:xij为随机获得的正常初始种群;为由DOL获得的一个群体,比正常初始群体的解更优质;i∈[1,Np],j∈[1,dim],dim是解的空间维度;[blbu]是解的边界;r1ir2i为[0,1]区间的随机数。按照式(3)进行边界检查,最后从中选择具有N个适应度最优解的个体作为初始化种群。
NRBO算法中自适应系数δ计算如下:
式中:I为当前迭代次数;Imax为最大迭代次数。
针对该公式动态适应性较差的问题,提出了改进后的自适应系数计算公式,使自适应系数δ在算法每次迭代开始时更新,并应用于算法整个迭代过程,从而控制种群位置更新幅度,提高种群从探索到开发的更平稳过渡,增强算法的动态适用性,改进后的公式如下:
图1为改进后的自适应系数δ1在迭代过程中的变化趋势,改进后的δ1值随迭代次数增加过渡更加平稳,有利于算法的探索和开发。
为增强种群搜索的多样性以及局部搜索能力,帮助种群跳出局部最优解,引入类似遗传算法的横向与纵向交叉策略[9],将其应用于NRBO算法的NRSR和TAO阶段后,先执行横向交叉策略,之后再执行纵向交叉策略,共同提高种群的多样性和局部搜索能力,在不影响算法收敛速度的前提下,提高算法求解的精确度。
横向交叉策略是在不同种群的相同维度中进行交叉运算,通过横向交叉策略对探索者进行位置更新,计算公式为:
式中:分别为探索者XidXjd经过横向交叉后产生的第d维个体;r1r2是[0,1]区间的随机数;c1c2是[-1,1]区间的随机数。
横向交叉后,需要对新产生的个体进行纵向交叉操作,从而提高算法跳出局部最优解的能力,计算公式为:
式中:为探索者Xidd1d2维度内通过纵向交叉产生的个体;r是[0,1]区间的随机数。
为了验证改进NRBO算法(INRBO)的性能,选取粒子群算法(PSO)[10]、麻雀搜索算法(SSA)[11]、鲸鱼优化算法(WOA)[12]、NRBO算法与INRBO算法从CEC2005测试函数集中选择6个基准测试函数进行性能比较,在比较过程中将各算法的运行次数设置为30次,种群数为500,分别计算得到每个算法的平均值、标准差以及最优值,运行结果如表1所示。由表1可知,INRBO算法在6个基准测试函数上的平均值、标准差以及最优值大多数优于NRBO算法、PSO算法、SSA算法和WOA算法,说明INRBO算法性能较其余几种算法更优。
研究表明,影响边坡安全系数的主要因素有容重、黏聚力,内摩擦角,边坡角、边坡高度和孔隙水压比[13]。因此,从文献[14-16]中选取200组边坡案例的6个因素建立样本数据库,部分样本数据如表2所示。
首先对选取的样本数据库进行特征相关性分析,如果特征之间具有相关性,在进行预测时需要进行降维,以防特征之间的相关性影响预测结果。采用MATLAB软件绘制特征之间的皮尔逊相关性热图,如图2所示。两两特征之间具有一定相关性,内摩擦角和边坡角之间的相关性系数最大,为0.59,其余两两特征之间的相关性系数均小于0.5,由此可见,所有特征之间的相关系数均小于0.6,特征之间的相关性程度均属于非强相关,存在明显的非线性关系,因此,不需要对数据进行降维操作。
INRBO-SVM模型的构建步骤如图3所示。将表2中200组样本数据的前191组作为训练集,后9组作为测试集,影响边坡安全系数的因素作为输入,安全系数作为输出,建立基于INRBO-SVM边坡安全系数预测模型,并对该模型性能进行检验。采用INRBO-SVM模型与NRBO-SVM模型对表2数据进行迭代收敛,收敛曲线如图4所示。由图4可知,INRBO-SVM模型寻找最优值的速度比NRBO-SVM模型快。INRBO-SVM模型最终预测结果与实际值的对比如图5所示,可见实际值与预测值高度吻合。
采用INRBO-SVM模型与NRBO-SVM模型、SVM模型和RBF模型对9组测试样本的安全系数进行预测,并将各模型的预测值与实际值进行对比,从而检验INRBO-SVM模型的性能。INRBO初始化设置种群数为50,迭代次数为100。结果如图6所示。由图6可知,INRBO-SVM模型预测的安全系数与实际安全系数基本保持一致,各模型安全系数预测值与实际值的绝对值差从大到小排序为:RBF模型>SVM模型>NRBO-SVM模型>INRBO-SVM模型。
为了更直观地了解各模型安全系数预测值与实际值的拟合程度,采用积分绝对误差(integral absolute error,IAE)作为判断标准,IAE越小,说明模型预测效果越好。其计算公式为:
式中:EIA为积分绝对误差;Mol为模型预测值;Exp为实际值。
各模型IAE如图7所示。由图7可知,INRBO-SVM模型的IAE最小,说明INRBO-SVM模型预测值与实际值的拟合效果最好。
为了更好地对比模型的预测性能,采用相关系数(R2),均方根误差(RMSE)以及平均绝对误差(MAE)作为评价指标,计算公式分别为:
式中:E1为均方根误差值;E2为平均绝对误差值;n为数据长度;Yii时刻边坡安全系数的预测值;yii时刻边坡安全系数的实际值;为实际安全系数的均值。R2越大越好、RMSE和MAE越小,预测结果越好。
各模型安全系数预测值的相对误差如表3所示。采用INRBO-SVM模型预测的边坡安全系数相对误差最大值为0.69%,所有相对误差均控制在1%之内;NRBO-SVM模型、SVM模型、RBF模型相对误差最大值分别为2.62%,15.57%,40.02%,与前文验证结果一致。
由公式(10)~(12)计算得到各模型的R2、RMSE、MAE如表4所示。与其他3种模型相比,INRBO-SVM模型的R2最大,RMSE和MAE最小,说明INRBO-SVM模型预测精度高,性能好,可信度高。
为了验证INRBO-SVM模型预测未知边坡安全系数的准确性,从文献[17]中引入10组边坡实例,采用该模型预测这10组边坡的安全系数,预测结果与原始安全系数的对比如表5所示。由表5可知,INRBO-SVM模型预测边坡安全系数的相对误差均在10%以内,且有8组边坡的安全系数相对误差小于5%,可见,该模型在边坡安全系数预测中有较高的准确率和工程应用价值。
1)针对SVM模型参数选取困难的问题,引入动态反向学习策略、横向与纵向交叉策略对NRBO算法进行改进,帮助种群在搜索时跳出局部最优解,增强搜索能力,并对原算法自适应系数δ进行修改。采用基准函数测试,证明了改进NRBO算法(INRBO)在平均值、标准差以及最优值方面优于NRBO、PSO、SSA和WOA算法,显著提升了原算法的寻优效率和精确度。最后,基于INRBO算法构建了INRBO-SVM边坡安全系数预测模型。
2)从预测精度、统计指标和拟合效果3个方面对构建的INRBO-SVM模型进行验证分析,INRBO-SVM模型对边坡安全系数的预测性能显著优于其他模型。
3)INRBO-SVM模型在10组实际边坡工程案例中的应用结果表明,INRBO-SVM模型在预测边坡安全系数方面具有较高的准确率,可为边坡的安全设计提供技术支持。
  • 国家自然科学基金联合项目(U1602232)
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2025年第45卷第2期
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doi: 10.3969/j.issn.0253-6099.2025.02.004
  • 接收时间:2024-10-12
  • 首发时间:2026-03-19
  • 出版时间:2025-04-01
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  • 收稿日期:2024-10-12
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国家自然科学基金联合项目(U1602232)
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    1.昆明理工大学 公共安全与应急管理学院,云南 昆明 650093
    2.昆明理工大学 国土资源工程学院,云南 昆明 650093
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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