节理岩体的等效“层理”方法及其工程应用  

Equivalent"Bedding"Method of Jointed Rock Mass and its Engineering Application

作　　者：谭文辉 刘慧敏 梁爽 张亚飞 王培涛 TAN Wenhui;LIU Huimin;LIANG Shuang;ZHANG Yafei;WANG Peitao(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083

出　　处：《矿业研究与开发》2023年第4期116-124,共9页Mining Research and Development

基　　金：国家自然科学基金资助项目(52074020)。

摘　　要：现有等效方法难以考虑岩体力学参数的各向异性,基于统计优势结构面理论,提出研究岩体各向异性的等效“层理”方法。首先,在利用ShapeMetrix 3D测量系统进行现场结构面实测和室内常规试验基础上,采用真实破裂过程分析(RFPA)软件进行了岩体力学参数尺寸效应的研究,分析了表征单元体(Representative Elementary Volume, REV)力学特性的各向异性,确定了各向异性力学参数。然后,基于优势结构面理论,根据弹性主方向确定了等效“层理”方向。最后,采用横观各向同性弹性损伤理论和有限元方法,分析了不同等效层理下巷道围岩变形与破坏的特点。研究表明,节理角度不同,损伤分布区域存在明显差异,其分布情况基本上与岩体等效“层理”方向呈互相垂直的分布关系。等效“层理”方向同样会影响巷道顶板的最大主应力,因此,巷道支护设计考虑岩体的各向异性才能更好地保证矿山工程的安全性。The existing equivalent method is difficult to consider the anisotropy of rock mechanical parameters.Based on the theory of statistical dominant structural plane,an equivalent"bedding"method for studying the anisotropy of rock mass was proposed.Firstly,based on the field measurement of structural plane and indoor routine test by using ShapeMetrix 3D measurement system,the size effect of rock mass mechanical parameters was studied by using the real fracture process analysis(RFPA)software.The anisotropy of the mechanical properties of representative elementary volume(REV)was analyzed,and the anisotropic mechanical parameters were determined.Then,based on the theory of dominant structural plane,the equivalent"bedding"direction was determined according to the elastic principal direction.Finally,the deformation and failure characteristics of roadway surrounding rock under different equivalent"bedding"were analyzed by transverse isotropic elastic damage theory and finite element method.The research shows that there are obvious differences in the damage distribution area with different joint angles,and the distribution is basically perpendicular to the equivalent bedding direction of the rock mass.The equivalent"bedding"direction also affects the maximum principal stress of the roadway roof.Therefore,the roadway support design considering the anisotropy of rock mass can better ensure the safety of mine engineering.

关 键 词：节理岩体 等效“层理” 各向异性 表征单元体 力学参数 优势结构面 

分 类 号：TD31[矿业工程—矿井建设]