预应力锚索的非线性分析  

NON-LINEAR ANALYSIS ON PRESTRESSED CABLE

作　　者：何思明[1] 张小刚[1] 王成华[1] 

机构地区：[1]中国科学院成都山地灾害与环境研究所,成都610041

出　　处：《岩石力学与工程学报》2004年第9期1535-1541,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：交通部西部工程(D20204035);中国科学院知识创新工程(KZCX2-306)资助项目。

摘　　要：首先,将预应力锚索锚固段离散化,并将预应力锚索体系分解成承受侧阻力荷载作用的岩土体部分及锚固段部分并分别加以研究;然后,基于Mindlin应力解及应力叠加原理计算岩土体内任意点处的应力分布,根据修正分层总和法计算预应力荷载下锚固段稳定岩土体内任意点处的变形值,根据锚索锚固段荷载传递特性来计算其变形量;最后,根据两者荷载、变形协调关系建立联立方程组,采用迭代法求解,可以获得各锚索锚固段的侧阻力分布及荷载、变形特性。Firstly anchoring body of prestressed cable is discretized, and prestressed cable system is decomposed into two parts, anchoring body and rock, which are investigated separately. Secondly, the 3D stress of arbitrary point of rock is calculated based on Mindlin stress solution and stress superposition principle. The deformation of arbitrary point of rock under prestress loading is determined according to modified layered summation, and the deformation of anchoring body is obtained according to loading transfer differential equation. Then, the compatibility equation group of loading and deformation is established. Lateral resistance distribution and deformation character of prestressed cable is obtained with iterative method. A case calculation with comparison with test results shows that the presented methodology is reasonable.

关 键 词：岩土力学 非线性 MINDLIN应力解 荷载传递 迭代法 

分 类 号：TD352.5[矿业工程—矿井建设]