摘要
岩体是一种非均质、各向异性的非连续性材料,其力学特性研究较为复杂。Mohr-Coulomb强度准则(以下简称M-C)是岩土工程当中使用较多,且应用经验较为丰富的强度准则,采用能量型的M-C强度准则开展岩体理论研究具有一定的研究意义。基于此,以弹性应变能广义M-C强度准则(简称为GM-C)为基础,建立能量型广义M-C岩体强度准则(简称为EGM-C强度准则),同时将EGM-C强度准则嵌入到FLAC 3D软件中并进行模拟计算,验证该准则的适用性。理论分析表明:当岩体完整性系数K v等于1时该准则蜕变为GM-C强度准则;当岩体完整性系数K v等于1、材料变形参数νmc等于0.5时该准则蜕变为M-C强度准则。EGM-C强度准则是对GM-C强度准则和M-C强度准则的继承与发展,是以材料变形参数νmc、岩体完整性系数K v为参数的强度准则集合,并非单一强度准则;EGM-C岩体强度准则能够完全利用已有的M-C强度准则的研究成果,并将其应用于实际工程中;两组岩体试验数据验证得出:EGM-C强度准则略高于L.Y.Zhang提出的广义三维H-B岩体强度准则的计算值;同时将EGM-C本构模型嵌入到FLAC 3D有限元软件中并成功调用,在有限元软件中建立一个坡高为30m、未设边坡支护的边坡模型,采用M-C本构模型与EGM-C本构模型作对比分析,结果表明:M-C本构模型与EGM-C本构模型的塑性变形区域大致相似,但EGM-C本构模型与M-C本构模型计算得出的位移分别为8.6318cm、4.6117cm,EGM-C本构模型计算出的结果更偏于安全,这可能与EGM-C本构模型考虑了岩体完整性系数和材料变形参数有关。
Rock mass is a heterogeneous,anisotropic,and discontinuous material,making its mechanical properties complex to study.The Mohr-Coulomb strength criterion(hereinafter referred to as M-C)is widely used in geotechnical engineering and has extensive application experience.Conducting theoretical research on rock mass using the energy-based M-C strength criterion holds significant research value.Based on this,an energy-based generalized M-C rock mass strength criterion(referred to as EGM-C strength criterion)is established,grounded on the elastic strain energy generalized M-C strength criterion(referred to as GM-C).The EGM-C strength criterion is embedded into FLAC 3D software for simulation and calculation to verify its applicability.Theoretical analysis indicates:when the rock mass integrity coefficient K v equals 1,the criterion degenerates into the GM-C strength criterion;when the rock mass integrity coefficient K v equals 1 and the material deformation parameterνmc equals 0.5,the criterion degenerates into the M-C strength criterion.The EGM-C strength criterion is an inheritance and development of the GM-C and M-C strength criteria,forming a collection of strength criteria parameterized by the material deformation parameterνmc and rock mass integrity coefficient K v,rather than a single strength criterion.The EGM-C rock mass strength criterion can fully utilize existing research results of the M-C strength criterion and apply them to practical engineering.Verification with two sets of rock mass test data shows that the EGM-C strength criterion is slightly higher than the calculated values of the generalized three-dimensional H-B rock mass strength criterion proposed by L.Y.Zhang.Additionally,the EGM-C constitutive model is embedded into the FLAC 3D finite element software and successfully invoked.A slope model with a height of 30 meters and without slope support is established in the finite element software.Comparative analysis using the M-C constitutive model and the EGM-C constitutive model shows that the plastic deformation regions are roughly similar.However,the displacements calculated by the EGM-C constitutive model and the M-C constitutive model are 8.6318cm and 4.6117cm,respectively,with the EGM-C constitutive model yielding results that are more inclined towards safety.This may be related to the EGM-C constitutive model considering the rock mass integrity coefficient and material deformation parameter.
作者
蒋磊
孔信
熊健
JIANG Lei;KONG Xin;XIONG Jian(Guizhou Wujiang Qingshuihe Hydropower Development Co.,Ltd.,Guiyang 550025,China)
出处
《水利建设与管理》
2024年第9期35-43,共9页
Water Conservancy Construction and Management
关键词
岩体边坡
强度准则
弹性应变能
数值分析
rock slope
strength criterion
elastic strain energy
numerical analysis
