基于单元重构与节点分离的大型地下洞室软弱结构面模拟方法
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摘要
针对在大型地下洞室中软弱结构面难以合理模拟的问题,通过引进"单元重构-节点分离"思想,提出了新的非连续软弱结构面模拟方法.将该方法用于实际地下厂房模型中并模拟出非连续结构面,并将该重构模型导入计算程序,与常规连续有限元模型的计算结果进行对比.结果表明,重构模型能够用于数值计算,计算结果在非连续结构面附近呈现非连续性,且计算结果所反映的规律与所认识规律基本一致,能够反映真实的结构面赋存状态.因此,该软弱结构面建模方法实现了结构面的非连续化,为大型地下洞室的复杂地质非连续结构面模拟提供了新的实现途径.
As weak structural planes are difficult to be simulated reasonably in large underground chamber,"element reconstruction and node separation"was introduced,and the new simulation methodology of discontinuous weak structural planes was proposed in this study.The proposed methodology was used in the actual numerical model of underground powerhouse to simulate the discontinuous weak structural planes.The reconstructed model was then imported into calculation program,and the result was compared with the prediction by conventional continuous finite element model.The comparison shows that the reconstructed model can be used in the numerical calculation,and the discontinuity feature is presented near the discontinuous structural planes.Moreover,the rules in the calculation results are consistent with the general rules,which can describe the actual occurrence mode of the structural planes.Therefore,the simulation methodology of discontinuous weak structural planes achieves the transformation into the discontinuity of the structural planes,and it provides a new way for the simulation of complex geological discontinuous weak structural planes in large underground chamber.
As weak structural planes are difficult to be simulated reasonably in large underground chamber,"element reconstruction and node separation"was introduced,and the new simulation methodology of discontinuous weak structural planes was proposed in this study.The proposed methodology was used in the actual numerical model of underground powerhouse to simulate the discontinuous weak structural planes.The reconstructed model was then imported into calculation program,and the result was compared with the prediction by conventional continuous finite element model.The comparison shows that the reconstructed model can be used in the numerical calculation,and the discontinuity feature is presented near the discontinuous structural planes.Moreover,the rules in the calculation results are consistent with the general rules,which can describe the actual occurrence mode of the structural planes.Therefore,the simulation methodology of discontinuous weak structural planes achieves the transformation into the discontinuity of the structural planes,and it provides a new way for the simulation of complex geological discontinuous weak structural planes in large underground chamber.
引文
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[17]黄生文,司铁汉,陈文胜,等.断层对大跨度隧道围岩应力影响的有限元分析[J].岩石力学与工程学报,2006,25(z2):3788-3793.HUANG Shengwen,SI Tiehan,CHEN Wensheng,et al.Finite element analyses of influence of fault on large-span tunnel surrounding rock stress[J].Chinese Journal of Rock Mechanics&Engineering,2006,25(z2):3788-3793.(In Chinese)
[2]邱颖,孙云贵.断层力学模型及其数值模拟方法评述[J].水利与建筑工程学报,2004,2(1):14-16.QIU Ying,SUN Yungui.Study on fault mechanics model and numerical simulation methods[J].Journal of Water Resources&Architectural Engineering,2004,2(1):14-16.(In Chinese)
[3]肖明,陈俊涛.大型地下洞室复杂地质断层数值模拟分析方法[J].岩土力学,2006,27(6):880-884.XIAO Ming,CHEN Juntao.Numerical simulation and analysis method of complex geologic faults in large underground chamber[J].Rock&Soil Mechanics,2006,27(6):880-884.(In Chinese)
[4]雷显权,陈运平.应用非连续模型研究断层对地壳应力的影响[J].中南大学学报:自然科学版,2011,42(8):2379-2386.LEI Xianquan,CHEN Yunping.Effects of faults on crustal stress using discontinuous model[J].Journal of Central South University:Science and Technology,2011,42(8):2379-2386.(In Chinese)
[5]GOODMAN R E,TAYLOR R L,BREKKE T L.A model for the mechanics of jointed rock[J].Journal of Soil Mechanics&Foundations Div,2015,94:637-660.
[6]方涛,柴军瑞,胡海浪,等.Monte Carlo方法在岩体裂隙结构面模拟中的应用[J].露天采矿技术,2007(1):7-9.FANG Tao,CHAI Junrui,HU Hailang,et al.Application of Monte Carlo method to simulating the fracture interconnectivity of rock mass[J].Opencast Mining Technology,2007(1):7-9.(In Chinese)
[7]张雨霆,肖明,左双英.基于单元重构的岩土工程复杂地质断层建模方法[J].岩石力学与工程学报,2009,28(9):1848-1855.ZHANG Yuting,XIAO Ming,ZUO Shuangying.Methodology for modeling of complex geological faults in geotechnical engineering based on element reconstruction[J].Chinese Journal of Rock Mechanics&Engineering,2009,28(9):1848-1855.(In Chinese)
[8]张雨霆,肖明,丁秀丽,等.复杂岩石块体识别的单元重构-聚合方法[J].岩石力学与工程学报,2012,31(3):507-523.ZHANG Yuting,XIAO Ming,DING Xiuli,et al.Identification method of complex rock blocks using element reconstruction and aggregation technique[J].Chinese Journal of Rock Mechanics&Engineering,2012,31(3):507-523.(In Chinese)
[9]朱伯芳.有限单元法原理与应用[M].2版.北京:中国水利水电出版社,1998:112-124.ZHU Bofang.Principles and applications of finite element method[M].2nd ed.Beijing:China Water&Power Press,1998:112-124.(In Chinese)
[10]龙述尧,侯淑娟.关于无网格方法中点插值形函数的研究[J].湖南大学学报:自然科学版,2004,31(3):94-97.LONG Shuyao,HOU Shujuan.A study on shape functions in the meshless point interpolation method[J].Journal of Hunan University:Natural Sciences,2004,31(3):94-97.(In Chinese)
[11]卞康,肖明.退化单元位移场插值计算方法研究[J].武汉大学学报:工学版,2008,41(6):16-20.BIAN Kang,XIAO Ming.Research on calculation methods for displacement field interpolation of degenerate elements[J].Engineering Journal of Wuhan University,2008,41(6):16-20.(In Chinese)
[12]李新强,杨松青,汪小刚.岩体随机结构面三维网络的生成和可视化技术[J].岩石力学与工程学报,2007,26(12):2564-2569.LI Xinqiang,YANG Songqing,WANG Xiaogang.Generation and visualization technologies of three-dimensional network of rockmass stochastic structural plane[J].Chinese Journal of Rock Mechanics&Engineering,2007,26(12):2564-2569.(In Chinese)
[13]SHYU K.Nodal-based discontinuous deformation analysis[D].Berkeley,USA:Department of Civil Engineering,University of California,Berkeley,1993:10-20.
[14]TIAN Q,ZHAO Z,BAO H.Block fracturing analysis using nodal-based discontinuous deformation analysis with the double minimization procedure[J].International Journal for Numerical&Analytical Methods in Geomechanics,2013,81(4):409-415.
[15]曹代勇,吴李泉,占文锋,等.断层应力封闭性的FLAC模拟研究[J].煤田地质与勘探,2005,33(1):1-3.CAO Daiyong,WU Liquan,ZHAN Wenfeng,et al.Application of FLAC in simulation of fault stress seal[J].Coal Geology&Exploration,2005,33(1):1-3.(In Chinese)
[16]翟晓荣,吴基文,彭涛,等.断层对煤层开采应力分布影响的数值模拟分析[J].煤矿开采,2013,18(5):14-16.ZHAI Xiaorong,WU Jiwen,PENG Tao,et al.Numerical simulation for influence of faults on mining stress distribution[J].Coal Mining Technology,2013,18(5):14-16.(In Chinese)
[17]黄生文,司铁汉,陈文胜,等.断层对大跨度隧道围岩应力影响的有限元分析[J].岩石力学与工程学报,2006,25(z2):3788-3793.HUANG Shengwen,SI Tiehan,CHEN Wensheng,et al.Finite element analyses of influence of fault on large-span tunnel surrounding rock stress[J].Chinese Journal of Rock Mechanics&Engineering,2006,25(z2):3788-3793.(In Chinese)
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