不规则柱状节理玄武岩变形参数反分析研究  

Back Analysis of Jointed Deformation Parameters of Irregular Columnar Jointed Basalts

作　　者：狄圣杰[1,2] 单治钢[1] 李良权[1] 

机构地区：[1]中国水电顾问集团华东勘测设计研究院有限公司,浙江杭州310014 [2]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058

出　　处：《水力发电》2013年第12期16-20,共5页Water Power

基　　金：国家自然科学基金(50911130366);浙江省博士后科研项目二类择优资助(BSH1302013)

摘　　要：在力学分析时,柱状节理玄武岩可视为玄武岩刚性材料与节理面接触材料的复合型二元介质,其物理力学特性主要由节理面控制。同时,节理面法向刚度K n和切向刚度K s选取标准直接影响到等效岩体变形模量。结合白鹤滩水电站坝址区柱状节理玄武岩原位变形载荷试验,基于广义回归神经网络(GRNN)及三维离散元模拟(3DEC)方法进行节理变形参数的反分析,分析计算结果与实测结果吻合较好。The columnar jointed basalt can be considered as a composite binary medium of rigid basalt material and joint surface contact materials when analyzing its mechanical properties, and its mechanical properties are regarded to be mainly controlled by the joint surface. So the choices of joint surface normal stiffness Kn and tangential stiffness K will directly affect the equivalent deformation modulus of rock mass. Based on on-site load-bearing plate tests of the columnar jointed basalt in dam site area of Baihetan Hydropower Station, the back analysis on jointed deformation parameters are conducted by using General Regression Neural Network （GRNN） and 3 Dimension Discrete Element Code （3DEC）. The results of back analysis agree well with test results.

关 键 词：玄武岩 柱状节理 节理刚度 反分析 

分 类 号：TU459[建筑科学—岩土工程]