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The ground vibration input method based on viscous-spring boundary simulates the incidence of plane SV and P waves at different angles, and the acoustic structure coupling method is used to simulate the dynamic water pressure inside the lock chamber to study the seismic response of the lock roof displacement, acceleration and plastic damage in the ultra-high head lock chamber at different water depths. The study shows that when the seismic waves are obliquely incident, the seismic response of the ultra-high head locks varies significantly with the water depth compared to the vertical incidence, and the general degree of seismic response is greater than that of the vertical incidence. Under the same water depth conditions, the peak horizontal relative displacement and peak horizontal acceleration of the top of locks increases with the increases of the incidence angle in most cases. The seismic response of the lock chamber structure of the ultra-high head lock is significantly affected by the variation of the water depth. The area near the general gate wall with relative height of 0.2 is more likely to have serious damage, and when the relative water depth is 0.97, the tensile damage range on the waterfront side of the gate wall reaching serious damage is the largest. It is suggested that the combined effect of oblique incident seismic waves and different water depths within the gate should be considered.

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基于黏弹性边界的地震动斜入射方法模拟平面SV波和P波不同角度入射情况,采用声固耦合法模拟闸室内动水压力,研究超高水头船闸闸室在不同水深下闸顶位移、加速度和塑性损伤等地震反应。研究表明:地震波斜入射时,超高水头船闸的地震反应随水深变化的规律较垂直入射时明显不同,地震反应的程度一般较垂直入射时更大;相同水深条件下,闸顶水平相对位移峰值、水平加速度峰值多数情况下随入射角增大而增大。超高水头船闸闸室结构地震反应结果受水深变幅影响显著。一般闸墙相对高度为0.2附近的区域更易出现严重受拉损伤,相对水深为0.97时,闸墙临水侧达到严重破坏程度的受拉损伤范围最大。对综合考虑斜入射地震波和闸室内不同水深共同作用有一定的影响。

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曹周红(1978—),男,副教授,博士,主要从事港航工程结构仿真研究。E-mail:
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刘力侨(1999—),男,硕士研究生,主要从事港航工程结构仿真研究。E-mail:

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刘力侨(1999—),男,硕士研究生,主要从事港航工程结构仿真研究。E-mail:

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刘力侨(1999—),男,硕士研究生,主要从事港航工程结构仿真研究。E-mail:

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Relationship between damage factors and damage degree[29]

, figureFileSmall=null, figureFileBig=null, tableContent=
损伤因子[0,0.2](0.2,0.4](0.4,0.6](0.6,0.9](0.9,1]
损伤程度基本完好轻微损坏中等破坏严重破坏倒塌
), ArticleFig(id=1245389885859803969, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=CN, label=表1, caption=

损伤因子与损伤程度对应关系[29]

, figureFileSmall=null, figureFileBig=null, tableContent=
损伤因子[0,0.2](0.2,0.4](0.4,0.6](0.6,0.9](0.9,1]
损伤程度基本完好轻微损坏中等破坏严重破坏倒塌
), ArticleFig(id=1245389885968855876, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=EN, label=Table 2, caption=

Parameters of materials

, figureFileSmall=null, figureFileBig=null, tableContent=
材料密度/(kg/m3初始弹性模量/MPa泊松比初始黏聚力/kPa内摩擦角/(°)极限抗拉强度/MPa极限抗压强度/MPa剪切波速/(m/s)压缩波速/(m/s)体积模量/MPa流体声速/(m/s)
混凝土250027870.70.1671.916.8
基岩230035000.00.20025184111
回填石渣190030.00.3501035
水体100022501500
), ArticleFig(id=1245389886061130568, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=CN, label=表2, caption=

材料参数

, figureFileSmall=null, figureFileBig=null, tableContent=
材料密度/(kg/m3初始弹性模量/MPa泊松比初始黏聚力/kPa内摩擦角/(°)极限抗拉强度/MPa极限抗压强度/MPa剪切波速/(m/s)压缩波速/(m/s)体积模量/MPa流体声速/(m/s)
混凝土250027870.70.1671.916.8
基岩230035000.00.20025184111
回填石渣190030.00.3501035
水体100022501500
), ArticleFig(id=1245389886165988171, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=EN, label=Table 3, caption=

Range of severe damage to the gate wall under the plane SV wave as a percentage of the total height

, figureFileSmall=null, figureFileBig=null, tableContent=
相对水深闸墙严重破坏程度范围占总高度百分比/%
入射角0°入射角5°入射角10°入射角15°入射角20°
0.1508.7119.1021.7020.58
0.311.4516.5243.2333.3843.23
0.4817.9836.2555.6348.7155.63
0.648.7124.5238.7437.4038.74
0.8122.5129.7139.6544.6348.65
0.9753.0755.8659.9964.0766.81
), ArticleFig(id=1245389886275040078, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=CN, label=表3, caption=

平面SV波下闸墙严重破坏程度范围占总高度百分比

, figureFileSmall=null, figureFileBig=null, tableContent=
相对水深闸墙严重破坏程度范围占总高度百分比/%
入射角0°入射角5°入射角10°入射角15°入射角20°
0.1508.7119.1021.7020.58
0.311.4516.5243.2333.3843.23
0.4817.9836.2555.6348.7155.63
0.648.7124.5238.7437.4038.74
0.8122.5129.7139.6544.6348.65
0.9753.0755.8659.9964.0766.81
), ArticleFig(id=1245389886388286289, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=EN, label=Table 4, caption=

Range of severe damage to the gate wall under the plane P waves as a percentage of the total height

, figureFileSmall=null, figureFileBig=null, tableContent=
相对水深闸墙严重破坏程度范围占总高度百分比/%
入射角0°入射角15°入射角30°入射角45°入射角60°入射角75°
0.1500012.7313.9719.55
0.3100015.6322.3425.14
0.4800027.3361.7245.75
0.6400038.8869.6073.73
0.8100038.9369.3172.16
0.9700058.5476.3079.03
), ArticleFig(id=1245389886581224276, tenantId=1146029695717560320, journalId=1241701559352995854, articleId=1245389862422033188, language=CN, label=表4, caption=

平面P波下闸墙严重破坏程度范围占总高度百分比

, figureFileSmall=null, figureFileBig=null, tableContent=
相对水深闸墙严重破坏程度范围占总高度百分比/%
入射角0°入射角15°入射角30°入射角45°入射角60°入射角75°
0.1500012.7313.9719.55
0.3100015.6322.3425.14
0.4800027.3361.7245.75
0.6400038.8869.6073.73
0.8100038.9369.3172.16
0.9700058.5476.3079.03
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地震波斜入射时不同水深超高水头船闸地震反应分析
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刘力侨 1 , 曹周红 1, 2 , 李贤 1 , 苏颖 1 , 谭芝兰 1
地震工程与工程振动 | 2024,44(2): 194-207
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地震工程与工程振动 | 2024, 44(2): 194-207
地震波斜入射时不同水深超高水头船闸地震反应分析
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刘力侨1 , 曹周红1, 2 , 李贤1, 苏颖1, 谭芝兰1
作者信息
  • 1.长沙理工大学 水利与环境工程学院,湖南 长沙 410114
  • 2.洞庭湖水环境治理与生态修复湖南省重点实验室,湖南 长沙 410114
  • 刘力侨(1999—),男,硕士研究生,主要从事港航工程结构仿真研究。E-mail:

通讯作者:

曹周红(1978—),男,副教授,博士,主要从事港航工程结构仿真研究。E-mail:
Analysis of the seismic response of ultra-high head lock at different water depths under oblique incidence of seismic waves
Liqiao LIU1 , Zhouhong CAO1, 2 , Xian LI1, Ying SU1, Zhilan TAN1
Affiliations
  • 1.School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
  • 2.Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China
doi: 10.13197/j.eeed.2024.0220
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基于黏弹性边界的地震动斜入射方法模拟平面SV波和P波不同角度入射情况,采用声固耦合法模拟闸室内动水压力,研究超高水头船闸闸室在不同水深下闸顶位移、加速度和塑性损伤等地震反应。研究表明:地震波斜入射时,超高水头船闸的地震反应随水深变化的规律较垂直入射时明显不同,地震反应的程度一般较垂直入射时更大;相同水深条件下,闸顶水平相对位移峰值、水平加速度峰值多数情况下随入射角增大而增大。超高水头船闸闸室结构地震反应结果受水深变幅影响显著。一般闸墙相对高度为0.2附近的区域更易出现严重受拉损伤,相对水深为0.97时,闸墙临水侧达到严重破坏程度的受拉损伤范围最大。对综合考虑斜入射地震波和闸室内不同水深共同作用有一定的影响。

超高水头船闸  /  斜入射地震波  /  相对水深  /  黏弹性边界  /  声固耦合  /  地震反应

The ground vibration input method based on viscous-spring boundary simulates the incidence of plane SV and P waves at different angles, and the acoustic structure coupling method is used to simulate the dynamic water pressure inside the lock chamber to study the seismic response of the lock roof displacement, acceleration and plastic damage in the ultra-high head lock chamber at different water depths. The study shows that when the seismic waves are obliquely incident, the seismic response of the ultra-high head locks varies significantly with the water depth compared to the vertical incidence, and the general degree of seismic response is greater than that of the vertical incidence. Under the same water depth conditions, the peak horizontal relative displacement and peak horizontal acceleration of the top of locks increases with the increases of the incidence angle in most cases. The seismic response of the lock chamber structure of the ultra-high head lock is significantly affected by the variation of the water depth. The area near the general gate wall with relative height of 0.2 is more likely to have serious damage, and when the relative water depth is 0.97, the tensile damage range on the waterfront side of the gate wall reaching serious damage is the largest. It is suggested that the combined effect of oblique incident seismic waves and different water depths within the gate should be considered.

ultra-high head lock  /  oblique incidence of seismic waves  /  relative water depth  /  viscous-spring boundary  /  acoustic structure coupling  /  seismic response
刘力侨, 曹周红, 李贤, 苏颖, 谭芝兰. 地震波斜入射时不同水深超高水头船闸地震反应分析. 地震工程与工程振动, 2024 , 44 (2) : 194 -207 . DOI: 10.13197/j.eeed.2024.0220
Liqiao LIU, Zhouhong CAO, Xian LI, Ying SU, Zhilan TAN. Analysis of the seismic response of ultra-high head lock at different water depths under oblique incidence of seismic waves[J]. Earthquake Engineering and Engineering Dynamics, 2024 , 44 (2) : 194 -207 . DOI: 10.13197/j.eeed.2024.0220
近年来,中西部航运迅速发展,船闸不断向高水头、大型化迈进,一些水头大于30 m的高水头船闸,甚至超过40 m的超高水头船闸逐步进入大众视野,如已建大藤峡船闸的最大水头达到了40.3 m。然而,我国中西部地区地震频发,地震对超高水头船闸结构地震反应影响如何,亟待深入研究。
针对这一问题,战博[1]和崔春义等[2]在地基边界直接施加惯性力,探讨了船闸结构的地震响应。张丽等[3]通过在固定边界截断处直接施加加速度时程,采用黏弹性边界使平面S波从地基底部垂直入射的方式,研究不同地基模型下坞式闸室结构的动力响应差异。徐明磊[4]和薛静静[5]采用黏弹性人工边界模拟无限域地基,研究了水平地震作用下船闸闸室-土体相互作用体系的动力响应。张涛[6]依托设计水头为37.65 m的安谷高水头船闸,采用黏弹性边界探讨水平地震作用下闸室结构的地震动力特性。上述研究对地震多采用传统振动输入方式,且假设地震波垂直进行传播。实际上,地震波大多为倾斜向上传至建筑物且对结构影响更复杂[7-10],而这方面的研究在船闸领域目前较欠缺。
部分学者还考虑了闸室内水体地震动水压力,对单一水深条件下船闸结构的地震响应进行研究。XU等[11]通过BEM-FEM方法研究水平地震作用下水-闸室-土系统的动力响应。梁梁[12]通过附加质量法模拟闸室内动水压力,研究闸室结构的非线性地震反应。MALTIDIS[13]将水体视为声学介质,研究了水平地震作用下Iffezheim船闸和Fankel船闸的动力特性。MENDES等[14]通过声学单元考虑了闸室与水体的相互作用,研究了闸室内无水和水深为55 m时结构在水平强震作用下的动力反应特性。KONTOE等[15]考虑了水体对闸室的作用,研究了某大型复杂系统中高度为38.6 m的闸室结构在水平强震作用下的地震反应。然而,超高水头船闸由于闸室内水深变幅大,水体变幅对超高水头船闸地震反应是否存在影响,影响程度如何,还缺乏相关研究。
本文基于黏弹性边界的地震动斜入射方法,采用声固耦合法模拟闸室与水体之间的相互作用,考虑混凝土塑性损伤模型,建立不同深度水体与超高水头船闸闸室-地基-回填土耦合的三维有限元模型,研究平面SV波和P波不同角度入射时,超高水头船闸闸室在不同水深下的位移、加速度和塑性损伤等地震反应,为后续超高水头船闸的抗震安全评估提供参考。
1)人工边界及参数
采用杜修力等[16]提出的一种黏弹性人工边界来模拟无限地基辐射阻尼效应,相当于在有限域边界上施加并联的线性弹簧和阻尼器,三维黏弹性人工边界的弹簧-阻尼器元件参数取值为
法向:
切向:
式中:ρ为介质密度;KNKT分别为法向和切向的弹簧系数;CNCT分别为法向和切向的阻尼系数;AB为无量纲参数,较优取值分别建议为0.8、1.1;r可取为近场结构几何中心到该人工边界所在面的距离;cPcS分别为P波的波速和S波的波速;λ为拉梅常数;G为介质剪切模量。
2)地震波三维等效荷载实现方法
刘晶波等[17]提出了黏弹性边界的地震动输入方法,即把地震波输入转化为作用在人工边界节点上的等效荷载,其表达式为
式中:FB为边界节点处的等效节点力;KBCB分别为该节点上的弹簧刚度系数和阻尼系数;u0v0分别为入射波场的位移和速度时程;σ0为自由场应力,可由u0v0求出。
地震波斜入射时各人工边界内行场的位移、速度和应力计算公式参照文献[18-19],通过编制程序将等效节点荷载施加到人工边界节点上。三维平面地震波斜入射示意图如图1所示。其中SV波入射角度为0°、5°、10°、15°、20°,P波入射角度为0°、15°、30°、45°、60°、75°。
3)地震波入射方法精度验证
为验证地震波入射程序的模拟精度,分析了三维均匀弹性半空间在地震波不同入射角度下的动力反应问题。有限元模型如图2所示,模型相关尺寸和材料参数参照文献[20],黏弹性人工边界施加在有限元模型的侧面和底面,时间积分步长取为0.001 s,持续时长为2 s,地震波脉冲如图3所示。脉冲波位移时程的函数表达式为
限于篇幅,仅展示部分入射角度下O点的水平、竖向位移时程,如图4所示。结果表明数值解与理论解吻合度较好。
1)声固耦合模型
将流体视为声学介质,进而模拟闸室内水体与闸室结构间的动力相互作用,基于流体微幅运动、无旋、无粘基本假定,得出的以动水压力P为未知量的波动方程为[21]
式中:P为动水压力;t为时间;c为流体中的声速;∇2为二维拉普拉斯算子;,其中K为流体体积模量,ρw为声学流体密度。
基于线性波动理论,利用声学介质边界阻抗条件模拟闸室水体-闸墙间的相互作用边界,如图5所示。
声学介质边界上任意一点的阻抗边界条件方程为[22]
式中:为声学介质边界外法线方向的速度;1/k和1/c分别为声压和声学介质边界法线方向上位移和速度之间的比例系数。闸室水体-闸墙交界面Γ1施加tie约束,主面为闸室内表面,从面为闸室水体;闸室水体自由表面Γ2考虑微幅重力波的影响,1/k1取为1/ρfg,1/c1取为0;闸室流体截断处设置Γ3边界,在ABAQUS中设置为平面无反射条件[23]
2)模型验证
为验证声固耦合法在船闸结构中应用的可靠性,参照文献[24]建立水深为5 m的闸室水体-闸墙耦合的有限元模型,得出宽深比分别为2.0、2.5和3.0时的动水压力分布曲线,如图6所示,有限元结果与文献解析解吻合良好。此外,储液罐内水体与闸室内水体较为类似,均属于有限域内水体,参照文献[25]中的矩形储液罐模型及参数建立有限元模型,得到储液罐水体自由表面晃动波高,结果如图7所示,有限元结果与文献解吻合较好。从上述两案例结果看,通过声固耦合法模拟闸室水体与闸墙的动力相互作用是可行的。
混凝土在单轴受拉和单轴受压情况下的应力应变曲线公式为[26]
式中:下标t和c为拉伸和压缩;dtdc分别为拉伸和受压损伤因子,取值在0(无损伤)到1(完全损伤)之间,在ABAQUS中用以表示混凝土的破坏机制[27]E0为材料的无损伤弹性模量;分别为等效拉伸应变和压缩应变。
损伤因子计算公式为[28]
式中:分别为受拉、受压下的开裂应变;bcbt均取值于试验数据,建议取值为bc =0.7,bt =0.1。损伤因子与损伤破坏程度的关系如表1所示。
某超高水头船闸工程级别为四级,闸室为分离式结构,左右闸墙对称;最低通航水深10.53 m,最高通航水深70.13 m,最大水头59.6 m;闸室有效尺寸140 m×12 m×4 m(长×宽×门槛最小水深),闸墙总高76 m,闸墙顶部宽7 m,底板厚3.87 m,墙后回填料距顶部30 m。各项主要材料参数如表2所示。
有限元模型中地基横向宽度250 m,竖向高度130 m,顺流向长度8 m。最低通航水深下水体-闸室-地基-填土的有限元模型及特征部位如图8所示,水体采用声学单元模拟,闸室、地基和填土部分均采用实体单元划分,声学单元968个,实体单元54064个,共68915个节点,其中地基边界为黏弹性人工边界,填土和闸室部分在顺流向进行法向约束。闸室结构采用混凝土塑性损伤本构,其中混凝土塑性参数参照文献[30],基岩假设为线弹性材料,回填料采用摩尔库伦本构,通过在回填料与结构间建立接触单元模拟土压力,其中闸室内水体与闸墙相互作用采用声固耦合法模拟。
本文计算工况为船闸运行时突发地震状况,地震波波阵面平行于人工边界底面的棱边入射(图1图8),平面SV波入射角度选取为0°、5°、10°、15°、20°,平面P波入射角度选取为0°、15°、30°、45°、60°、75°;以最低通航水深为起始工况,最高通航水深为终末工况,将闸室内水深工况分为6组,故各相邻工况间水头差均为11.92 m,同时以闸室内净高为最大高度进行归一化处理,分别对应相对水深为0.15、0.31、0.48、0.64、0.81、0.97;地震荷载选取为人工波,峰值加速度为0.3 g,时间步长为0.01 s,持续时间为12 s,并对生成的人工地震波进行基线校正,地震波加速度时程曲线如图9所示。
以左闸墙为分析对象,探讨平面SV波和P波不同角度入射时、不同闸室水深下超高水头船闸闸顶水平相对位移峰值、水平加速度峰值和塑性损伤等地震反应,闸顶部位和损伤路径如图8所示。其中,“正向”表示沿X轴正方向,“负向”表示沿X轴负方向,符号为“-”。
1)闸顶水平相对位移峰值分析
平面SV波入射角度为0°、20°时闸顶水平相对位移时程曲线如图10所示,限于篇幅,未将所有入射角度下的位移时程曲线列出,下同。平面SV波不同角度入射时,闸顶水平相对位移峰值随水深变化的情况如图11所示(以R1为相对位移参考点,见图8)。由图11(a)可知,当平面SV波垂直入射时,正向水平相对位移峰值随水深增大而减小,最大为4.59 cm,最小为2.60 cm,相差43.36%;入射角为5°时,正向水平相对位移峰值随水深增大先基本保持不变,后逐渐减小,相对水深为0.48时最大为4.25 cm,相对水深为0.97时最小为2.81 cm,相差33.88%;入射角为10°~20°时,正向水平相对位移峰值随水深增大呈先增大后减小趋势,均在相对水深为0.48时最大,分别为4.33、4.40、4.44 cm,相对水深为0.97时最小,分别为2.98、3.04、3.11 cm,分别相差31.18%、30.91%、29.95%;当SV波斜入射,相对水深较小时,闸顶正向水平相对位移峰值随入射角增大呈先减小后增大趋势;当相对水深较大时,闸顶正向水平相对位移峰值随入射角增大而增大。
图11(b)可知,当平面SV波垂直入射时,负向水平相对位移峰值随水深增大而增大,最大和最小值分别为3.37、1.97 cm,相差41.54%;入射角为5°~15°,相对水深为0.15~0.64时,负向水平相对位移峰值随水深增大而增大,相对水深为0.64~0.97时,随水深增大呈先减小后增大趋势;负向水平相对位移峰值最大值均出现在相对水深为0.97时,分别为3.37、3.34、3.33 cm,最小值均出现在相对水深为0.15时,分别为1.97、2.03、2.04 cm,分别相差41.54%、39.22%、38.74%;入射角为20°时,负向水平相对位移峰值随水深增大而增大,最大和最小值分别为3.42、2.02 cm,相差40.94%;当平面SV波斜入射,水深条件相同时,闸顶负向水平相对位移峰值随入射角增大而增大。
可见,平面SV波斜入射时,闸顶水平相对位移峰值随水深变化的规律较垂直入射时明显不同,多数情况下斜入射时结果更大,不同入射角度和不同水深对闸顶水平相对位移响应有显著影响。
2)闸顶水平加速度峰值分析
平面SV波入射角度为0°、20°时闸顶水平加速度时程曲线如图12所示。平面SV波不同角度入射时,闸顶水平加速度峰值随水深变化的情况对比如图13所示。由图13(a)可知,当平面SV波垂直入射时,正向水平加速度峰值随水深变化的规律并不明显,相对水深为0.31时最大为3.91 m/s2,相对水深为0.97时最小为2.56 m/s2,相差34.53%;入射角为5°~20°时,正向水平加速度峰值随水深增大整体呈先减小后增大再减小趋势,均在相对水深为0.64时最大,分别为4.14、4.55、4.71、4.85 m/s2,相对水深为0.97时最小,分别为2.81、3.03、3.17、3.23 m/s2,分别相差32.13%、33.41%、32.70%、33.40%。
图13(b)可知,平面SV波垂直入射时,负向水平加速度峰值随水深增大而增大,最大为2.82 m/s2,最小为2.02 m/s2,相差28.37%;入射角为5°~20°,相对水深为0.15~0.64时,负向水平加速度峰值随水深增大而增大,相对水深为0.64~0.97时,随水深增大呈先减小后增大趋势;负向水平加速度峰值均在相对水深为0.64时最大,分别为2.76、2.80、2.90、2.91 m/s2,在相对水深为0.97时最小,分别为2.00、2.06、2.07、2.07 m/s2,分别相差27.54%、26.43%、28.62%、28.86%。
可见,平面SV波斜入射时,闸顶水平加速度峰值随水深变化的规律较垂直入射时明显不同,多数情况下斜入射时结果更大。另外,当平面SV波斜入射,水深条件相同时,闸顶正向和负向水平加速度峰值整体上随入射角增大而增大,加速度响应在不同入射角度和不同水深条件下有较大差异。
3)塑性损伤分析
平面SV波不同角度入射时,不同水深下闸墙临水侧受拉损伤沿高程分布的情况如图14所示。
平面SV波垂直入射时闸墙临水侧受拉损伤沿高程分布如图14(a)所示,当相对水深为0.15~0.48时,受拉损伤因子随高度增大呈先增大后缓慢减小的趋势,最大受拉损伤因子均出现在相对高度0.237附近,分别为0.56、0.60、0.67;当相对水深为0.64时,受拉损伤因子随高度增大整体先增大后减小,最大受拉损伤因子出现在相对高度0.215附近,为0.63;当相对水深为0.81~0.97时,受拉损伤因子随高度增大先增大,随后在一定高度范围内保持平缓,最后再急剧减小,最大受拉损伤因子分别出现在相对高度0.319、0.425附近,分别为0.65、0.79;随水深增大,最大受拉损伤因子先增大后减小再增大,相对水深为0.97时出现最大值。
图14(b)可知,入射角为5°时不同水深下受拉损伤沿高程分布情况和最大损伤因子随水深变化的情况与图14(a)基本一致,但相同相对高度,不同相对水深下受拉损伤因子的相对大小关系发生明显改变,相对水深为0.64时最为明显。
平面SV波入射角为10°时闸墙临水侧受拉损伤沿高程分布如图14(c)所示,当相对水深为0.15~0.48时,受拉损伤因子随高度变化的规律与垂直入射时基本一致,最大受拉损伤因子均出现在相对高度0.21附近,分别为0.72、0.77、0.84;当相对水深为0.64时,受拉损伤因子随高度变化的规律与垂直入射时基本一致,最大受拉损伤因子出现在相对高度0.185附近,为0.88;当相对水深为0.81~0.97时,受拉损伤因子随高度增大先增大,随后在一定高度范围内呈先减小再增大最后再急剧减小的趋势,受拉损伤因子沿高程分布有2个极大值分别为0.670、0.698和0.811、0.826,分别在相对高度0.215、0.41和0.215、0.483附近;随水深增大,最大受拉损伤因子先增大后减小再增大,相对水深为0.64时出现最大值。
图14(d)、(e)可知,入射角为15°和20°时受拉损伤因子沿高程分布情况和最大损伤因子随水深变化的情况与图14(c)基本一致,但相同相对高度,不同相对水深下受拉损伤因子的相对大小关系有明显区别,相对水深为0.81时最为显著。
可见,相较于垂直入射,斜入射时不同水深下受拉损伤因子极值更大;平面SV波不同入射角度和不同水深下的闸墙临水侧受拉损伤沿高程分布规律差异显著;另外,综合SV波不同入射角和不同水深下的塑性损伤分布特征,多数情况下相对高度为0.2附近的区域更易出现严重受拉损伤。
平面SV波作用下,闸墙在各水深下为严重破坏程度的范围占总高度百分比如表3所示。
表3可知,平面SV波作用下,闸墙临水侧的受拉损伤达到严重破坏程度的范围,均在相对水深为0.97时最大,平面SV波斜入射时,相同水深下闸墙出现严重破坏的损伤范围要比垂直入射时大。
1)闸顶水平相对位移峰值分析
平面P波入射角度为0°、75°时闸顶水平相对位移时程曲线如图15所示。平面P波不同角度入射时,闸顶水平相对位移峰值随水深变化的情况如图16所示。由图16(a)可知,当平面P波垂直入射时,正向水平相对位移峰值随水深增大呈先增大后减小趋势,相对水深为0.31时最大为1.36 cm,相对水深为0.97时最小为0.59 cm,相差56.62%;入射角为15°~75°时,正向水平相对位移峰值随水深增大而减小,最大值分别为2.19、3.79、4.98、6.02、6.04 cm,最小值分别为0.76、1.99、2.60、3.45、3.51 cm,分别相差65.30%、47.49%、47.79%、42.69%、41.89%。
图16(b)可知,当平面P波垂直入射时,负向水平相对位移峰值随水深增大而增大,相对水深小于0.48时,闸墙顶部相对位移偏向X轴正方向,当相对水深大于0.48时,闸墙顶部相对位移偏向X轴负方向,从最低通航水深到最高通航水深闸顶负向水平相对位移峰值变化了271%;入射角为15°时,负向水平相对位移峰值随水深增大呈先增大后减小再增大趋势,最大为0.91 cm,最小为0.04 cm,相差95.60%;入射角为30°~75°时,负向水平相对位移峰值随水深增大整体上呈下降趋势,最大和最小值分别相差43.10%、49.31%、63.9%、67.4%,且随入射角增大,不同水深下负向水平相对位移峰值差异越大。
可见,平面P波斜入射时,闸顶水平相对位移峰值随水深变化的情况较垂直入射时区别显著,多数情况下斜入射时结果更大;另外,当平面P波斜入射,水深条件相同时,闸顶正向和负向水平相对位移峰值随入射角增大而增大。
2)闸顶水平加速度峰值分析
平面P波入射角度为0°、75°时闸顶水平加速度时程曲线如图17所示。平面P波不同角度入射时,闸顶水平加速度峰值随水深变化的情况如图18所示。由图18(a)可知,当平面P波垂直入射时,正向水平加速度峰值随水深增大呈先减小后增大再减小的趋势,相对水深为0.81时最大为1.13 m/s2,相对水深为0.97时最小为0.66 m/s2,相差41.59%;入射角为15°时,正向水平加速度峰值随水深增大而减小,最大为1.31 m/s2,最小为0.80 m/s2,相差38.93%;入射角为30°~60°时,正向水平加速度峰值随水深增大整体呈先增大后减小的趋势;入射角为30°和45°时,正向水平加速度峰值均在相对水深为0.31时最大,分别为2.77、4.17 m/s2,相对水深为0.97时最小,分别为1.93、2.79 m/s2,分别相差30.32%、33.09%;入射角为60°时,正向水平加速度峰值在相对水深为0.48时最大为5.63 m/s2,相对水深为0.97时最小为3.54 m/s2,相差37.12%;入射角为75°时,正向水平加速度峰值随水深增大而减小,最大为6.09 m/s2,最小为3.77 m/s2,相差38.10%。
图18(b)可知,当平面P波垂直入射时,负向水平加速度峰值随水深增大呈先减小后增大再减小趋势,相对水深为0.64时最大为0.81 m/s2,相对水深为0.97时最小为0.64 m/s2,相差20.99%;入射角为15°时,负向水平加速度峰值随水深变化规律与垂直入射时基本一致,相对水深为0.15时最大为1.30 m/s2,相对水深为0.31时最小为0.99 m/s2,相差23.85%;入射角为30°~75°时,负向水平加速度峰值随水深增大整体上呈先减小后增大趋势;入射角为30°时,在相对水深为0.97时最大为2.22 m/s2,相对水深为0.64时最小,为1.65 m/s2,相差25.68%;入射角为45°~75°时,均在相对水深为0.97时最大,分别为2.78、2.81、2.84 m/s2,在相对水深为0.31时最小,分别为1.98、2.34、2.55 m/s2,分别相差28.78%、16.73%、10.21%。
可见,在平面P波斜入射时,闸顶水平加速度峰值随水深变化的规律较垂直入射时有明显区别,多数情况下斜入射时结果更大;闸顶水平加速度峰值随水深变化的规律受入射角度的影响显著,不同水深条件下加速度响应差异明显。另外,当P波斜入射,水深条件相同时,闸顶正向和负向水平加速度峰值随入射角增大而增大。
3)塑性损伤分析
平面P波不同角度入射时,不同水深下闸墙临水侧受拉损伤沿高程分布情况如图19所示。平面P波垂直入射和入射角为15°时,闸墙临水测处于线弹性阶段,未发生受拉损伤破坏。
平面P波入射角为30°时受拉损伤沿高程分布如图19(a)所示,当相对水深为0.15~0.48时,受拉损伤因子随高度增大整体先增大,随后在一定范围内先急剧减小再缓慢减小,最大受拉损伤因子均出现在相对高度0.2附近,分别为0.588、0.534、0.388;当相对水深为0.64~0.97时,受拉损伤因子随高度增大呈先增大后减小趋势,整体呈弧形状,最大受拉损伤因子分别出现在相对高度0.244、0.301、0.425附近,分别为0.018、0.074、0.375;最大受拉损伤因子随水深增大先减小后增大,相对水深为0.15时出现最大值。
平面P波入射角为45°时受拉损伤沿高程分布如图19(b)所示,当相对水深为0.15~0.97时,受拉损伤因子随高度增大整体呈先增大后减小趋势,在分布型式上有所区别;最大受拉损伤因子均出现在相对高度0.2附近,分别为0.698、0.703、0.765、0.827、0.85、0.836;最大受拉损伤因子随水深增大先增大后减小,相对水深为0.81时出现最大值。
平面P波入射角为60°时受拉损伤沿高程分布如图19(c)所示,当相对水深为0.15~0.64时,受拉损伤因子随高度增大整体呈先增大后减小,随后又增大再减小的趋势,受拉损伤因子沿高程分布均有2个极大值,在中下部区域,最大受拉损伤因子分别出现在相对高度为0.215、0.229、0.215、0.185附近,极大值分别为0.451、0.554、0.682、0.845,在中上部区域最大受拉损伤因子分别出现在相对高度为0.637、0.637、0.608、0.637附近,极大值分别为0.63、0.656、0.732、0.79;当相对水深为0.81~0.97时,受拉损伤因子随高度增大整体呈先增大后减小趋势,最大值分别出现在相对高度0.185、0.215附近,分别为0.927、0.947;最大受拉损伤因子随水深增大而增大,相对水深为0.97时出现最大值。
图19(d)可知,平面P波入射角为75°时,不同水深下受拉损伤沿高程分布情况和最大损伤因子随水深变化的情况与图19(c)基本一致。
可见,平面P波不同角度入射时,不同水深下的闸墙临水侧受拉损伤沿高程分布情况和最大受拉损伤因子随水深变化情况有明显差异,综合P波不同入射角度和不同水深下的塑性损伤分布特征,多数情况下相对高度为0.2附近的区域更易出现严重受拉损伤。
平面P波作用下,闸墙在各水深下为严重破坏程度的范围占总高度百分比如表4所示。
表4可知,平面P波作用下,闸墙临水侧受拉损伤达到严重破坏程度的范围均在相对水深为0.97时最大,平面P波斜入射时,相同水深下闸墙出现严重破坏的损伤范围要比垂直入射时大。
本文基于黏弹性边界的地震动斜入射方法模拟平面SV波和P波不同角度入射情况,采用声固耦合法模拟水体与闸墙之间相互作用,考虑混凝土塑性损伤,建立了超高水头船闸水体-闸室-地基-回填土耦合的三维有限元模型,研究地震波不同入射角度和闸室内不同水深下超高水头船闸的地震反应,得到如下主要结论:
1)地震波斜入射时,超高水头船闸的地震反应随水深变化的规律较垂直入射时明显不同,地震反应的程度一般较垂直入射时更大;另外,当地震波斜入射,水深条件相同时,闸顶正向和负向的水平相对位移峰值、水平加速度峰值多数情况下随入射角增大而增大,应考虑斜入射地震波对超高水头船闸结构的影响。
2)地震波斜入射时,水深变幅会对超高水头船闸结构地震反应结果造成较大影响,在实际工程中应考虑水深变幅的影响。
3)多数情况下闸墙相对高度为0.2附近的区域更容易达到严重受拉损伤破坏的程度;相对水深为0.97时,闸墙临水侧达到严重破坏程度的受拉损伤范围最大。
综上,本文建议在进行类似的超高水头船闸地震反应分析时,应综合考虑斜入射地震波和闸室内不同水深共同作用的影响。
本文在顺水流方向只选取一个结构段长度进行研究,后续还可考虑地震波不同方位角入射和闸室结构段之间的碰撞问题,以便更加全面地探讨超高水头船闸闸室在三维空间上的地震反应规律。另外,不同入射角度和不同水深共同影响下结构受力特性差异的成因有待进一步研究。
  • 国家自然科学基金项目(51309037)
  • 洞庭湖水环境治理与生态修复湖南省重点实验室开放基金项目(2018DT04)
  • 长沙理工大学水利与环境工程学院研究生“双一流”建设项目(2022040201)
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2024年第44卷第2期
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doi: 10.13197/j.eeed.2024.0220
  • 接收时间:2022-12-05
  • 首发时间:2026-03-30
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  • 收稿日期:2022-12-05
  • 修回日期:2023-03-21
基金
国家自然科学基金项目(51309037)
洞庭湖水环境治理与生态修复湖南省重点实验室开放基金项目(2018DT04)
长沙理工大学水利与环境工程学院研究生“双一流”建设项目(2022040201)
作者信息
    1.长沙理工大学 水利与环境工程学院,湖南 长沙 410114
    2.洞庭湖水环境治理与生态修复湖南省重点实验室,湖南 长沙 410114

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曹周红(1978—),男,副教授,博士,主要从事港航工程结构仿真研究。E-mail:
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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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