岩体尺寸效应数值模拟及参数识别研究  

Numerical Simulation and Parameter Identification of Rock Mass Size Effect

作　　者：毛振凯 杨柱 王文瑞 苏振坤 MAO Zhenkai;YANG Zhu;WANG Wenrui;SU Zhenkun(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Department of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]西安科技大学建筑与土木工程学院,西安710054

出　　处：《西北水电》2024年第5期20-25,共6页Northwest Hydropower

基　　金：国家自然科学基金项目(U1965107).

摘　　要：岩体力学参数是工程设计与建设的基石,直接影响着设计计算的准确性与工程建设的稳定性。基于岩体结构力学,采用数值模拟手段以随机裂隙网络构建裂隙岩样尺寸与裂隙岩样力学参数指标关系,确定可用于工程实际的岩体力学参数,并将数值模拟法与常用各类折减法所获取的岩体力学参数进行对比分析。结果表明:随裂隙岩样尺寸增加,内部裂隙数目增加,各项力学指标逐渐减小并趋于稳定。根据不同方法确定岩体力学参数对比结果,数值模拟法能较好地获取岩体力学参数,且在弹性模量、摩擦角指标获取上具有一定优势,以随机裂隙数值模拟方法进行参数识别具有一定可行性。Mechanical parameters of rock mass are the cornerstone of engineering design and construction,which directly affect the accuracy of design calculation and the stability of engineering construction.Based on the structural mechanics of rock mass,the relationship between fracture rock sample size and fracture rock sample mechanical parameters index is constructed using numerical simulation and random fracture network,and the rock mass mechanical parameters that can be used in engineering practice are determined.The numerical simulation method is compared with the rock mass mechanical parameters obtained by various common reduction methods.The results show that with the increase in fracture sample size,the number of internal cracks increases,and the mechanical indexes decrease gradually and tend to be stable.According to the comparison results of rock mass mechanical parameters determined by different methods,the numerical simulation method can better obtain rock mass mechanical parameters and has certain advantages in obtaining elastic modulus and friction angle indexes.It is feasible to identify parameters by random fracture numerical simulation method.

关 键 词：裂隙岩体 尺寸效应 数值模拟 折减法 岩体力学参数 

分 类 号：TU457[建筑科学—岩土工程]