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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
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)
关键词
柱状节理
节理刚度
各向异性
变形试验
离散元法
columnar joints
joint stiffness
anisotropy
deformation test
discrete element method
