斜向荷载作用下岩质地基基础应力分布  

Stress distribution of rock foundation under the action of slant load

作　　者：李珂 阴可[1] 姚舜禹 LI Ke;YIN Ke;YAO Shunyu(School of Civil Engineering,Chongqing University,Chongqing 400044,China;Chongqing Hi-new Geotechnical Investigation and Design Institute Co.,Ltd.,Chongqing 400047,China)

机构地区：[1]重庆大学土木工程学院,重庆400044 [2]重庆市高新工程勘察设计院有限公司,重庆400047

出　　处：《哈尔滨工程大学学报》2018年第9期1526-1531,共6页Journal of Harbin Engineering University

基　　金：高等学校博士学科点科研基金项目(20110191110027)

摘　　要：针对含有斜向支撑或斜向传力构件的岩土体支护结构嵌岩基础存在力学机理不明晰的问题,采用斜向荷载作用下岩质地基基础模型试验与三维有限元模型的分析方法,得到了斜向荷载作用下岩质地基基础应力分布规律和基础破坏模式。通过引入Goodman层状岩体内应力求解中的等效各向同性介质理论对基础压应力核心体边界进行了求解;在Southwell基本方程基础上通过Hankel积分变换对压应力核心体边界计算中的主要参数kn与ks的理论算法进行了推导。本文通过对比理论计算与三维有限元分析结论,验证了基于等效各向同性介质理论提出的基础压应力核心体边界和参数kn与ks的理论计算方法,得到了斜向荷载作用下岩质地基基础应力分布的特点及其应力边界求解方法,为岩质地基基础的内应力后续研究与设计提供了理论依据。The paper discussed the problem that implicit mechanical mechanism exists in the rock-embedded foundation of rock&earth mass support structure containing slant support or slant stress transfer structure.By carrying out rock foundation model test under the condition of acting slant load and utilizing the analysis method of three-dimensional FE model,the stress distribution law and destruction mode of rock foundation under the condition of acting slant load were obtained.By introducing the equivalent isotropic medium theory for solving the internal stress of Goodman layered rock mass,the boundary of the compressive-stress core of foundation was solved;on basis of Southwell basic equation,Hankel integral transformation was adopted to deduce the theoretical algorithm of the main parameter kn and ks in the calculation process of the boundary of the compressive-stress core.By comparing with theoretical calculation and the three-dimensional FE analysis conclusion,the paper verified the theoretical algorithm on the boundary of the compressive-stress core and the parameter kn and ks proposed on basis of the“equivalent isotropic medium”theory,obtained the stress distribution characteristics and the its boundary solution method of rock foundation under the condition of acting slant load,providing a theoretical basis for the subsequent research and design of the internal stress of rock foundation.

关 键 词：斜向荷载 岩质地基基础 应力分布 压应力核心体 法向刚度 切向刚度 

分 类 号：TU456[建筑科学—岩土工程]