A new estimation method and an anisotropy index for the deformation modulus of jointed rock masses

作     者：Bohu Zhang Junyan Mu Jun Zheng Qing Lv Jianhui Deng Bohu Zhang;Junyan Mu;Jun Zheng;Qing Lv;Jianhui Deng

作者机构：State Key Laboratory of Oil and Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu610500China School of Geoscience and TechnologySouthwest Petroleum UniversityChengdu610500China Department of Civil EngineeringZhejiang UniversityHangzhou310058China Center for Balance ArchitectureZhejiang UniversityHangzhou310007China State Key Laboratory of Hydraulics and Mountain River EngineeringCollege of Water Resource and HydropowerSichuan UniversityChengdu610065China 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2022年第14卷第1期

页      面：153-168页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：funded by the National Key R&D Program of China(Grant Nos.2017YFE0119500 and 2018YFC1505005) the National Natural Science Foundation of China(Grant No.41972264) 

主　　题：Deformation modulus Analytical method Anisotropy index Jointed rock masses Mechanical behavior Discrete fracture network(DFN) 

摘      要：The deformation modulus of a rock mass is an important parameter to describe its mechanical *** this study,an analytical method is developed to determine the deformation modulus of jointed rock masses,which considers the mechanical properties of intact rocks and joints based on the superposition *** to incorporating the variations in the orientations and sizes of joint sets,the proposed method is applicable to the rock mass with persistent and parallel joints as well as that with nonpersistent and nonparallel *** addition,an anisotropy index AIdmfor the deformation modulus is defined to quantitatively describe the anisotropy of rock *** range of AIdmis from 0 to 1,and the more anisotropic the rock mass is,the larger the value of AIdmwill *** evaluate the proposed method,20 groups of numerical experiments are conducted with the universal distinct element code(UDEC).For each experimental group,the deformation modulus in 24 directions are obtained by UDEC(numerical value)and the proposed method(predicted value),and then the mean error rates are *** that the mean error rate is the mean value of the error rates of the deformation modulus in 24 directions,where for each direction,the error rate is equal to the ratio of numerical value minus predicted value to the numerical *** results show that(i)for different experimental groups,the mean error rates vary between 5.06%and 22.03%;(ii)the error rates for the discrete fracture networks(DFNs)with two sets of joints are at the same level as those with one set of joints;and(iii)therefore,the proposed method for estimating the deformation modulus of jointed rock masses is valid.