柱状节理岩体原位变形试验力学浅析与模拟  

Mechanical analysis and simulation of in-situ deformation test of columnar jointed rock mass

作　　者：狄圣杰[1,2] 徐卫亚[1,2] 王伟[1,2] 吴关叶[3] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程科学研究所,南京210098 [3]中水顾问集团华东勘测设计研究院,杭州310014

出　　处：《岩土力学》2012年第2期501-508,553,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50911130366);国家自然科学基金(No.50979030)

摘　　要：在白鹤滩坝址区柱状节理岩体原位变形试验成果的基础上,针对节理刚度的取值进行讨论,利用柔性中心孔试验值反算得到柱状节理岩体节理面刚度值。岩体变形是由岩块和节理两部分组成,分析含单节理岩体概念模型的单轴加、卸载规律性和其变形特性,发现其滞回特性是节理力学行为造成的;推导得到了岩体变形计算公式,可用于多组相交节理岩体等效弹性模量的计算,能够反映出节理岩体的各向异性特征;建立了柱状节理随机模型,采用离散元方法和反算的刚度值进行了仿真分析,得到等效变形参数在试验结果范围内。The value of joint stiffness based on in-situ deformation experimental results of columnar jointed rock mass in Baihetan dam region was discussed.The value of columnar joint stiffness is obtained by using experimental data of flexible central hole deformation test.The regulation and deformation properties of rock single concept model are analyzed.Rock deformation is made up of two parts,one of rock and one of rock joint,and its hysteretic properties are determined by joints＇ mechanical behavior.Moreover,the formula of deformation deduced can calculate the equivalent elastic modulus of multi-set intersection joint rock and describe the anisotropic characteristics of jointed rock.A random model of columnar jointed rock mass is established.The rock mass is stimulated by using discrete element method and the stiffness of reverse calculation;and equivalent deformation parameters obtained are in the range of test results.

关 键 词：柱状节理 节理刚度 各向异性 变形试验 离散元法 

分 类 号：TU452[建筑科学—岩土工程]