Article(id=1322164547436261608, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322164546295410919, articleNumber=null, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1733328000000, receivedDateStr=2024-12-05, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793158192691, onlineDateStr=2026-10-28, pubDate=1764000000000, pubDateStr=2025-11-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793158192691, onlineIssueDateStr=2026-10-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793158192691, creator=13701087609, updateTime=1793158192691, updator=13701087609, issue=Issue{id=1322164546295410919, tenantId=1146029695717560320, journalId=1225396423026438145, year='2025', volume='45', issue='11', pageStart='1', pageEnd='284', issueExtLink='null', onlineDate='null', pubDate='1764000000000', pubDateStr='2025-11-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793158192465, creator='13701087609', updateTime=1793158905697, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322167537857573862, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322164546295410919, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322167537861768167, tenantId=1146029695717560320, journalId=1225396423026438145, issueId=1322164546295410919, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=38, endPage=45, ext={EN=ArticleExt(id=1322164547608228073, articleId=1322164547436261608, tenantId=1146029695717560320, journalId=1225396423026438145, language=EN, title=Stability Analysis and Optimization of Structural Parameters of a Broken and Thick Ore Body, columnId=null, journalTitle=Mining Research and Development, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Ensuring the stope stability is the foundation for the efficient and safe extraction of broken and thick ore bodies. Taking the mining of a broken and thick ore body in a certain mine as the engineering background, researches were conducted on optimizing the structural parameters of the stope during the orebody mining process using the downward wall filling mining method. The influences of drift dimensions, drift layout patterns, and filling frequencies on stope stability were analyzed in detail from three perspectives of principal stress, vertical displacement, and plastic zone. The findings indicate that the principal stress in the roof of the excavation zone exhibits an approximately uniform distribution, with the minimum principal stress showing tensile stress in the hanging wall and adjacent areas, while the maximum principal stress remains compressive. The central roof of the stope experiences the greatest settlement, while significant settlement is also observed in the hanging wall area, with no settlement but slight bulging in the footwall. The recommended optimal structural parameters are as follows, drift dimensions of 3.0 m×3.0 m, a vertical cross-shaped layout of drift, and a full-height filling process. Industrial trials demonstrate that this optimized solution can control the loss and dilution rate of the stope to approximately 5%, with mining costs maintained at 150 yuan per ton. The resource recovery efficiency and economic benefits are effectively enhanced, providing reliable technical support for subsequent safe and efficient mining operations in the mine.

, authors=Yuejin PENG1, 2, Zhicheng OU3, Yuansheng LIN1, 2, Ning YANG1, 2, Renze OU1, 2, Huilin WANG3, authorsList=Yuejin PENG, Zhicheng OU, Yuansheng LIN, Ning YANG, Renze OU, Huilin WANG, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322164551697674501, articleId=1322164547436261608, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=某破碎厚大矿体稳定性分析及结构参数优化研究, columnId=1226462294490657775, journalTitle=矿业研究与开发, columnName=采矿与矿山充填, runingTitle=null, highlight=null, articleAbstract=

保证采场稳定性是支撑破碎厚大矿体高效安全开采的基础。以某矿破碎厚大矿体开采为工程背景,围绕下向壁式充填采矿法在矿体回采过程中的采场结构参数开展优化研究,从主应力、竖向位移和塑性区3个角度重点分析了进路尺寸、进路布置形式及充填次数对采场稳定性的影响。研究结果表明:开挖区域顶板主应力近似呈均匀分布,最小主应力在上盘及邻近区域表现为拉应力,而最大主应力始终为压应力;采场顶板中央沉降量最大,上盘区域沉降亦较明显,下盘未见沉降,仅出现轻微鼓胀现象。推荐的最优结构参数为:进路尺寸3.0 m × 3.0 m,进路垂直交叉呈“十”字形布置,并采用一次全高充填工艺。工业试验表明,该优化方案可将采场损失贫化率控制在约5%,采矿成本控制在150元/t,有效提升了资源回收效率与经济效益,为矿山后续安全高效开采提供了可靠的技术支撑。

, authors=彭跃金1, 2, 欧志成3, 林元生1, 2, 杨宁1, 2, 欧任泽1, 2, 王辉林3, authorsList=彭跃金, 欧志成, 林元生, 杨宁, 欧任泽, 王辉林, authorCompany=null, correspAuthors=null, authorNote=

彭跃金(1993—),男,山西怀仁人,硕士,工程师,主要从事采矿技术研究。E-mail:

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彭跃金(1993—),男,山西怀仁人,硕士,工程师,主要从事采矿技术研究。E-mail:

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彭跃金(1993—),男,山西怀仁人,硕士,工程师,主要从事采矿技术研究。E-mail:

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Rock mechanics parameters and backfill parameters

, figureFileSmall=null, figureFileBig=null, tableContent=
材料弹性模量E/GPa体积模量K/GPa剪切模量G/GPa抗拉强度T/MPa密度ρ/(kg/m3)黏聚力C/MPa内摩擦角φ/(°)
矿体3.002.781.140.052 8000.8025
围岩10.007.253.940.152 9802.0027
高强度充填体1.100.920.420.162 2000.3022
低强度充填体0.700.580.270.142 1000.2520
), ArticleFig(id=1322164564167340375, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=CN, label=表1, caption=

岩体力学参数及充填体参数

, figureFileSmall=null, figureFileBig=null, tableContent=
材料弹性模量E/GPa体积模量K/GPa剪切模量G/GPa抗拉强度T/MPa密度ρ/(kg/m3)黏聚力C/MPa内摩擦角φ/(°)
矿体3.002.781.140.052 8000.8025
围岩10.007.253.940.152 9802.0027
高强度充填体1.100.920.420.162 2000.3022
低强度充填体0.700.580.270.142 1000.2520
), ArticleFig(id=1322164564251226456, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=EN, label=Table 2, caption=

Layout schemes

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试验分组进路高度/m进路宽度/m进路布置方式充填次数备注
13.02.5~5“十”1进路高度
24.02.5~5“十”1进路高度
35.02.5~5“十”1进路高度
43.02.5“十”1进路宽度
53.03.0“十”1进路宽度
63.04.0“十”1进路宽度
73.05.0“十”1进路宽度
83.03.0“器”1进路布置方式
93.03.0“品”1进路布置方式
103.03.0“十”1进路布置方式
113.03.0“十”1充填次数
123.03.0“十”2充填次数
), ArticleFig(id=1322164564339306841, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=CN, label=表2, caption=

布置方案

, figureFileSmall=null, figureFileBig=null, tableContent=
试验分组进路高度/m进路宽度/m进路布置方式充填次数备注
13.02.5~5“十”1进路高度
24.02.5~5“十”1进路高度
35.02.5~5“十”1进路高度
43.02.5“十”1进路宽度
53.03.0“十”1进路宽度
63.04.0“十”1进路宽度
73.05.0“十”1进路宽度
83.03.0“器”1进路布置方式
93.03.0“品”1进路布置方式
103.03.0“十”1进路布置方式
113.03.0“十”1充填次数
123.03.0“十”2充填次数
), ArticleFig(id=1322164564418998618, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=EN, label=Table 3, caption=

Minimum principal stress of model under different filling times

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充填次数上盘监测点/MPa中部监测点/MPa下盘监测点/MPa
10.005 70.05-2.58
20.067 00.05-2.43
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不同充填次数下模型最小主应力

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充填次数上盘监测点/MPa中部监测点/MPa下盘监测点/MPa
10.005 70.05-2.58
20.067 00.05-2.43
), ArticleFig(id=1322164564582576476, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=EN, label=Table 4, caption=

Maximum principal stress of model under different filling times

, figureFileSmall=null, figureFileBig=null, tableContent=
充填次数上盘监测点/MPa中部监测点/MPa下盘监测点/MPa
1-0.23-0.41-7.12
2-0.30-0.50-7.35
), ArticleFig(id=1322164564666462557, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=CN, label=表4, caption=

不同充填次数下模型最大主应力

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充填次数上盘监测点/MPa中部监测点/MPa下盘监测点/MPa
1-0.23-0.41-7.12
2-0.30-0.50-7.35
), ArticleFig(id=1322164564741960030, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=EN, label=Table 5, caption=

Vertical displacement of model under different filling times

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充填次数上盘监测点/mm中部监测点/mm下盘监测点/mm
1-8.79-14.020.91
2-9.00-14.701.02
), ArticleFig(id=1322164564830040415, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=CN, label=表5, caption=

不同充填次数下模型竖向位移

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充填次数上盘监测点/mm中部监测点/mm下盘监测点/mm
1-8.79-14.020.91
2-9.00-14.701.02
), ArticleFig(id=1322164564922315104, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=EN, label=Table 6, caption=

Main technical and economic indicators

, figureFileSmall=null, figureFileBig=null, tableContent=
进路生产能力/(t/d)采切比/(m/kt)损失率/%贫化率/%采矿成本/(元/t)
357.555150
), ArticleFig(id=1322164565006201185, tenantId=1146029695717560320, journalId=1225396423026438145, articleId=1322164547436261608, language=CN, label=表6, caption=

主要技术经济指标

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进路生产能力/(t/d)采切比/(m/kt)损失率/%贫化率/%采矿成本/(元/t)
357.555150
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某破碎厚大矿体稳定性分析及结构参数优化研究
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彭跃金 1, 2 , 欧志成 3 , 林元生 1, 2 , 杨宁 1, 2 , 欧任泽 1, 2 , 王辉林 3
矿业研究与开发 | 采矿与矿山充填 2025,45(11): 38-45
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矿业研究与开发 |采矿与矿山充填 2025 , 45 (11) : 38 -45
某破碎厚大矿体稳定性分析及结构参数优化研究
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彭跃金1, 2 , 欧志成3, 林元生1, 2, 杨宁1, 2, 欧任泽1, 2, 王辉林3
作者信息
  • 1.长沙矿山研究院有限责任公司,湖南 长沙 410012
  • 2.国家金属采矿工程技术研究中心,湖南 长沙 410012
  • 3.西部矿业股份有限公司,青海 西宁市 810008
作者简介:

彭跃金(1993—),男,山西怀仁人,硕士,工程师,主要从事采矿技术研究。E-mail:

Stability Analysis and Optimization of Structural Parameters of a Broken and Thick Ore Body
Yuejin PENG1, 2 , Zhicheng OU3, Yuansheng LIN1, 2, Ning YANG1, 2, Renze OU1, 2, Huilin WANG3
Affiliations
  • 1.Changsha Institute of Mining Research Co., Ltd., Changsha, Hunan 410012, China
  • 2.National Engineering Research Center for Metal Mining, Changsha, Hunan 410012, China
  • 3.Western Mineral Co., Ltd., Xining, Qinghai 810008, China
出版时间: 2025-11-25
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保证采场稳定性是支撑破碎厚大矿体高效安全开采的基础。以某矿破碎厚大矿体开采为工程背景,围绕下向壁式充填采矿法在矿体回采过程中的采场结构参数开展优化研究,从主应力、竖向位移和塑性区3个角度重点分析了进路尺寸、进路布置形式及充填次数对采场稳定性的影响。研究结果表明:开挖区域顶板主应力近似呈均匀分布,最小主应力在上盘及邻近区域表现为拉应力,而最大主应力始终为压应力;采场顶板中央沉降量最大,上盘区域沉降亦较明显,下盘未见沉降,仅出现轻微鼓胀现象。推荐的最优结构参数为:进路尺寸3.0 m × 3.0 m,进路垂直交叉呈“十”字形布置,并采用一次全高充填工艺。工业试验表明,该优化方案可将采场损失贫化率控制在约5%,采矿成本控制在150元/t,有效提升了资源回收效率与经济效益,为矿山后续安全高效开采提供了可靠的技术支撑。

破碎厚大矿体  /  结构参数优化  /  下向壁式充填法  /  采场稳定性  /  数值模拟

Ensuring the stope stability is the foundation for the efficient and safe extraction of broken and thick ore bodies. Taking the mining of a broken and thick ore body in a certain mine as the engineering background, researches were conducted on optimizing the structural parameters of the stope during the orebody mining process using the downward wall filling mining method. The influences of drift dimensions, drift layout patterns, and filling frequencies on stope stability were analyzed in detail from three perspectives of principal stress, vertical displacement, and plastic zone. The findings indicate that the principal stress in the roof of the excavation zone exhibits an approximately uniform distribution, with the minimum principal stress showing tensile stress in the hanging wall and adjacent areas, while the maximum principal stress remains compressive. The central roof of the stope experiences the greatest settlement, while significant settlement is also observed in the hanging wall area, with no settlement but slight bulging in the footwall. The recommended optimal structural parameters are as follows, drift dimensions of 3.0 m×3.0 m, a vertical cross-shaped layout of drift, and a full-height filling process. Industrial trials demonstrate that this optimized solution can control the loss and dilution rate of the stope to approximately 5%, with mining costs maintained at 150 yuan per ton. The resource recovery efficiency and economic benefits are effectively enhanced, providing reliable technical support for subsequent safe and efficient mining operations in the mine.

Broken and thick ore body  /  Optimization of structural parameter  /  Downward wall filling mining method  /  Stope stability  /  Numerical simulation
彭跃金, 欧志成, 林元生, 杨宁, 欧任泽, 王辉林. 某破碎厚大矿体稳定性分析及结构参数优化研究. 矿业研究与开发, 2025 , 45 (11) : 38 -45 .
Yuejin PENG, Zhicheng OU, Yuansheng LIN, Ning YANG, Renze OU, Huilin WANG. Stability Analysis and Optimization of Structural Parameters of a Broken and Thick Ore Body[J]. Mining Research and Development, 2025 , 45 (11) : 38 -45 .
矿产资源是生产生活的物质基础,实现矿产资源的高效安全开发对保障经济增长与资源回收具有不可或缺的意义。破碎厚大矿体在我国分布广泛,但尚未形成一种行之有效的开采方法。优化采场结构参数是解决这一问题的关键。常见的采场结构参数包括采场尺寸、采场布置形式等。目前,针对采场结构参数的优化大致可分为5个方法:综合理论分析[1-3]、数值模拟法[4-5]、经验类比法[6-7]、相似模拟试验法[8]和力学分析法[9-10]。李加州等[11]基于AHP-TOPSIS模型,选取评价指标优选采矿方案,并利用综合评价模型优选出最佳采场结构参数;徐祥熙等[12]综合岩体质量分级,基于Mathews图解法给出某铁矿间柱回采最佳结构参数;展卫露等[13]通过数值模拟手段,对拟定采矿方案进行参数优化,提升了采场生产能力,取得了较好的经济技术指标;朱晨迪等[14]利用数值模拟软件优化了不同顶板条件下矿柱的厚度及采场尺寸;刘冬等[15]根据现场节理扫描等手段确定了地质特性,建立了破碎矿体数值模型以优化采场进路跨度;李夕兵等[16]研发了相似模拟试验平台,通过正交试验建立了岩体计算函数,得到对应矿山的最优采场结构参数。在现有研究中,力学分析虽基于各类理论公式进行了一定的简化,但与实际情况存在一定的出入。相似模拟试验耗时耗力,成本较高;经验类比则高度依赖于专业能力和从业经验。而数值模拟手段具有简便可靠的优势,计算工具以及模拟软件能够支持大尺度模型的仿真分析,已被广泛地应用于采场结构参数优化。
针对某矿矿岩条件破碎但开采价值较高的特点,为实现该矿矿产资源的高效安全回采,本研究基于折减后的矿体力学参数建立数值模型,对开采过程进行仿真模拟,科学地确定了最优采场结构参数,以期为该矿矿产资源回收提供技术依据。
某矿矿体极为破碎,呈块状、片状及粉末状,易破碎,上下盘围岩和夹石节理裂隙发育,多呈碎裂状,岩体稳定性较差。整个矿体呈现出层状,倾向南,倾角为40°~45°,平均走向长350 m,矿体平均厚度为35 m。在该矿岩条件下,最终选择采用下向分层壁式充填采矿法进行开采。
下向分层壁式充填采矿法合理的采场结构参数与回采顺序是支撑井下采场安全高效生产的关键。根据矿体赋存条件和下向分层壁式充填采矿法的技术特点,建立矿体开采模型,长80 m,高48 m(+30~+78 m),倾角45°,矿体厚35 m,矿体模型参数见表1。选取进路高度、进路宽度、进路布置方式及合理充填次数为不同结构参数。在采场(Z=60 m)中线上盘、中部和下盘3个位置布置监测点,得到不同结构参数条件下最大、最小主应力,位移沉降量和塑性区分布的模拟结果,具体布置方案见表2。其中进路布置方式以“器”字代表竖向平行布置,以“品”字代表竖向平行横向交错布置,以“十”字代表横竖垂直交错布置。图1为矿体可视化模型,图2为采场正视图。
模拟设置进路高度分别为3.0 m、4.0 m、5.0 m,模拟整个矿房的回采充填全过程。得到不同进路高度下盘区最大、最小主应力的模拟结果,如图3所示,数据符号用于区分应力状态,拉应力表示为正值,压应力表示为负值(下同)。随着采场“开挖—充填”循环的进行,采场上盘和中部的最小主应力逐渐变小,表现为拉应力,而下盘的最小主应力一直保持增大的趋势,始终表现为压应力。这是由于矿体呈40°~50°倾斜状态,且矿体厚大,上盘围岩和矿体对充填体存在倾覆压应力,采场中线附近的充填体在倾覆压应力场作用下发生沉降,且沉降量最大,从而表现为受拉。与前两者不同的是,下盘充填体前部和上部虽也受到倾覆压应力,但其始终受到下盘围岩的支撑应力,故下盘监测点的最小主应力一直增大,表现为压应力。
由图3(a)可知,采场开挖充填循环完成后,最小主应力随着进路高度的增加而逐渐降低,但降低幅度并不大,上盘监测点的最小主应力为0.079~0.093 MPa,中部监测点的最小主应力为0.017~0.050 MPa,下盘则表现为压应力,进路高度越高,压应力越大。
由图3(b)可知,采场上盘的最大主应力先逐渐变大,随着进路高度的进一步增加,最大主应力又会逐渐变小,而采场下盘和中部的最大主应力一直保持增大的趋势。上盘和中部测点压应力整体小于下盘,表明靠近采场上盘的张拉变形程度较靠近下盘更为剧烈。采场开挖充填循环完成后,最大主应力随着进路高度的增加而逐渐增大,上盘监测点的最大主应力为0.16~0.21 MPa,中部监测点的最大主应力为0.26~0.47 MPa,下盘监测点的最大主应力为7.1~8.3 MPa。
图4为不同进路高度条件下,采场上盘、中部、下盘各监测点的位移变化情况。图中纵坐标符号代表位移状态,负号表示下沉,正号表示底鼓(下同)。
由图4可知,随着采场“开挖—充填”循环的进行,采场上盘竖向位移逐渐变大。采场发生沉降,且最大沉降量位于采场中部,下盘有一定程度的鼓胀,越靠近下盘鼓胀量越大。随着进路高度的增大,采场顶板发生沉降的范围逐渐扩大,沉降量也逐渐增大,采场中部的沉降最大,各模型顶板沉降量为14.12~15.11 mm,上盘边界的沉降量次之,为10.38~10.82 mm,下盘边界未发生沉降,有轻微鼓胀。
不同进路高度条件下,采场塑性区分布状态如图5所示。采场回采过程中,模型出现了不同状态的塑性区分布,在靠近采场上盘和中部大部分区域出现了塑性区,越靠近上盘,塑性区面积越大,塑性破坏种类越多,主要为拉伸塑性破坏,下盘基本无塑性区,与围岩交界的局部偶见剪切塑性破坏。同时,随着进路高度的增加,模型整体的塑性区面积分布呈现逐渐增加的趋势,对整个采场稳定性造成不利的影响。
对比主应力、位移沉降和塑性区分布的情况,优选出最佳进路高度为3 m。
在确定进路高度为3 m的基础上,设置进路宽度分别为2.5 m、3.0 m、4.0 m、5.0 m,开展回采盘区第5个分层中间位置回采过程的模拟分析,采场主应力、位移沉降、塑性区分布情况见图6至图8。
由图6(a)可知,模拟采场开挖至第5分层中间位置时,上盘监测点的最小主应力表现为拉应力和压应力,数值范围为-0.008 4~0.001 7 MPa,中部监测点的最小主应力为拉应力,数值范围为0.000 4~0.002 8 MPa,下盘表现为压应力,进路宽度越大,压应力越大,但数值较小,为-2.7~-2.9 MPa。
由图6(b)可知,随着进路宽度的增加,采场上盘的最大主应力先变小后逐渐增大,数值范围为0.24~0.27 MPa,而中部和下盘的最大主应力一直保持增大的趋势,中部监测点数值范围为0.21~0.34 MPa,下盘监测点数值范围为7.4~7.7 MPa。上盘和中部测点压应力整体小于下盘,表明靠近上盘的采场顶板张拉变形程度较靠近下盘的采场顶板更为剧烈。
从图7可以看出,采场上盘和中部竖向位移逐渐变大,最大沉降量位于采场中部,下盘有一定程度的鼓胀,越靠近下盘,鼓胀量越大。随着进路宽度的增大,采场中部发生沉降的范围逐渐扩大,沉降量也逐渐增大。模拟开采至第5分层中间位置且进路未充填的情况下,各模型中部沉降量最大为13.12~14.00 mm,上盘边界的沉降量次之,为7.21~7.69 mm,下盘边界未发生沉降,有轻微鼓胀。
由图8可知,随着进路宽度的增加,模型塑性区的体积逐渐增加。当进路宽度为2.5~3.0 m时,塑性区体积最小,靠近上盘部分区域主要为拉伸破坏,但塑性区未贯穿整个采场,无大面积垮落风险;当进路宽度为4.0 m时,塑性区范围往下盘延伸;当进路宽度为5.0 m时,塑性区体积最大,塑性区贯通整个采场,塑性破坏较为严重。因此,基于上述分析,本文优选进路宽度为3.0 m。
设置进路布置方式分别为“器”字形上下平行布置、“品”字形上下交错布置、“十”字形垂直交叉布置,模拟回采完盘区前5个分层并充填完毕的情况,各模型主应力、位移沉降、塑性区分布情况见图9至图11。
由图9(a)可知,模拟采场回采充填完前5个分层,上盘监测点的最小主应力表现为拉应力和压应力,数值范围为-0.051~0.023 MPa,中部监测点的最小主应力均为拉应力,数值约为0.050 MPa。由应力云图也可得知,顶板大部分区域拉应力较小;下盘则表现为压应力,但数值较小,为-2.37~-2.40 MPa。
由图9(b)可知,3种进路布置方式下,最大主应力始终表现为压应力,“器”字形和“品”字形进路布置模型的最大主应力较大,“十”字形进路布置模型的最大主应力最小。其中,上盘监测点的最大主应力约为0.30 MPa,中部监测点的最大主应力为0.16~0.28 MPa,下盘监测点的最大主应力为6.95~6.99 MPa。
从图10可以看出,模拟开采至第5分层中间位置且进路未充填的情况下,各模型中部沉降量为13.59~14.20 mm,上盘沉降量次之,沉降量为7.77~7.85 mm,下盘未发生沉降,有轻微鼓胀。对比3种进路布置形式,“十”字形布置方案下,上盘、中部和下盘的沉降量均较小。
从图11可以看出,进路布置方式为“十”字形垂直交叉布置时,塑性区体积最小,靠近上盘部分区域主要为拉伸破坏,但塑性区未贯穿整个采场,无大面积垮落风险;当进路布置方式为“器”字形上下平行布置、“品”字形上下交错布置时,塑性区范围往下盘延伸,破坏较为严重,顶板垮塌风险较大。
对比分析不同布置形式的应力分布、位移沉降量和塑性区分布可知,“十”字形为最佳布置形式。
分别设置一次充填进路采空区全部高度、两次各充填进路采空区一半高度的条件,对回采完盘区前7个分层及充填过程进行模拟分析,各模型主应力、位移沉降结果见表3至表5,塑性区分布情况如图12所示。
从表3和表4可以看出,模拟采场上盘监测点的最小主应力均表现为拉应力,数值范围为0.005 7~0.067 MPa,中部监测点的最小主应力均为拉应力,约为0.05 MPa。最大主应力始终表现为压应力,上盘监测点的最大主应力为-0.23~-0.30 MPa,中部监测点的最大主应力为-0.41~-0.50 MPa,下盘监测点的最大主应力为-7.12~-7.35 MPa。
从表5可以看出,各模型顶板中部沉降量为14.02~14.70 mm,上盘边界的沉降量次之,为8.79~9.00 mm,下盘边界未发生沉降,有轻微鼓胀。
由图12可知,一次全高充填完成的模型的塑性区体积更小,一次充填进路采空区一半高度,分两次充填完成的模型的塑性区体积更大。一次全高充填完成的模型顶板靠近上盘部分区域存在当前状态的塑性区,主要为拉伸破坏,但塑性区未连通贯穿整个顶板,无大面积垮落风险;一次充填半高,分两次充填完成的模型盘区顶板塑性区范围往下盘及两侧有所延伸,同样以拉伸破坏为主,但出现了更多当前状态的剪切破坏区,顶板塑性破坏有较大的贯通趋势,顶板垮塌风险较大。
因此,在实际生产过程中推荐对采空区进行一次性全部充填,以确保采场的稳定性。
采场沿矿体走向划分盘区,盘区长度为80 m,中段高度为60 m,每隔12 m划分一个分段,在每个分段内再划分进路,根据模拟结果,进路断面规格为3.0 m×3.0 m,上下层进路布置“十”字形,每分层回采结束后充填宽度为2 m,预留1 m空间作为相邻进路的隔离空间和崩矿自由面。当进路沿走向布置时,回采顺序为由上盘向下盘开采,当进路垂直走向布置时,回采顺序为由一侧向另一侧开采。进路回采完成后在一侧采用钢骨架和钢筋网沿进路长度方向架设柔性充填挡墙进行充填,在相邻进路回采时,采用后退式撤出并回收挡墙材料。采矿方法如图13所示。
根据优化的结构参数对矿体应用下向壁式充填法,不留间柱和顶底柱,单向连续回采,简化了回采步骤,提高资源的回收率。得到的主要技术经济指标见表6。进路生产能力达35 t/d,损失率和贫化率均控制在5%左右,有效提升了资源回收效率与经济效益。
在确定矿体和围岩的条件下,归纳确定了影响某矿一分矿下向分层壁式充填采矿法的采场结构参数和回采顺序研究的关键因素为:进路高度、进路宽度、进路布置方式、充填次数,通过数值模拟软件建立模型并进行采充模拟,得到以下主要结论。
(1)主应力在开挖区域顶板均匀分布,最小主应力在靠近上盘区域表现为拉应力,说明受拉区域主要为采场上盘,最大主应力始终表现为压应力。采场中部沉降量最大,上盘沉降量也较大,下盘无沉降,仅有轻微鼓胀。
(2)基于数值模拟分析了不同模型的主应力、位移沉降、塑性区分布情况,在保证回采安全的前提下同时考虑生产实际,推荐进路高度为3.0 m,进路宽度为3.0 m,进路布置方式为“十”字形垂直交叉布置,充填次数为一次全高充填。
(3)将参数优化结果应用于现场,在保证采场安全回采和生产能力的前提下,实现了技术经济指标的优化,将损失贫化率控制在5%左右,采矿成本控制在150元/t。
  • “十四五”国家重点研发计划项目(2022YFC2904001)
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2025年第45卷第11期
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  • 接收时间:2024-12-05
  • 首发时间:2026-10-28
  • 出版时间:2025-11-25
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  • 收稿日期:2024-12-05
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“十四五”国家重点研发计划项目(2022YFC2904001)
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    1.长沙矿山研究院有限责任公司,湖南 长沙 410012
    2.国家金属采矿工程技术研究中心,湖南 长沙 410012
    3.西部矿业股份有限公司,青海 西宁市 810008
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
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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