弹性抗滑桩桩底支承条件对其内力和位移的影响分析  

Impact of Pile Bottom Bearing Conditions on Internal Force and Displacement of Elastic Anti-slide Pile

作　　者：焦世杰 苏爱军[1] 何啸 JIAO Shijie;SU Aijun;HE Xiao(Three Gorges Research Center for Geo-hazard,Ministry of Education, China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074

出　　处：《安全与环境工程》2018年第1期39-44,共6页Safety and Environmental Engineering

基　　金：教育部长江三峡库区地质灾害研究中心开放基金项目(TGRC2001409)

摘　　要：采用传统的抗滑桩内力计算方法"K"法,推导了弹性抗滑桩受荷段和嵌固段桩身内力和位移的计算公式,结合具体的工程实例,将抗滑桩桩底支承条件分别按自由支承、铰支承和固定支承考虑,利用MATLAB软件进行编程,分别计算出3种支承条件下抗滑桩桩身内力和位移,并进行了对比分析。结果表明:当抗滑桩嵌固段长度一定时,嵌固段地基系数K值的变化对桩底约束为固定支承的抗滑桩桩身内力的影响最大,对桩底约束为自由支承的抗滑桩桩身位移的影响最大;当嵌固段地基系数K值一定时,对桩底约束为固定支承的抗滑桩桩身弯矩的影响最大,剪力和位移的影响最小,对桩底约束为自由支承的抗滑桩桩身弯矩的影响最小,剪力和位移的影响最大,故在抗滑桩工程设计中,桩底支承条件应尽量按铰支承考虑。This paper derives the formula to calculate the internal force and displacement of the loaded and embedded segment of the elastic anti-slide pile by using traditional“K”method.Combined with specific engineering example,the paper calculates and compares the internal force and displacement of anti-slide pile with MATLAB software programming by considering three types of pile bottom bearing conditions,namely,free bearing,hinged bearing and fixed bearing respectively.The results show that when the length of the embedded section of the anti-slide pile is constant,the variation of the foundation coefficient of the embedded section has the greatest influence on the internal force of the anti-slide pile with fixed bearing condition,and on the displacement of the anti-slide pile with free bearing condition.When the foundation coefficient of the embedded section is constant,the bending moment of the anti-slide pile with fixed bearing condition is the highest,the shear stress and the displacement are the lowest.And the anti-slide pile with free bearing condition has the lowest bending moment and the displacement is the highest.Therefore,it is suggested to consider the hinged bearing condition in the design of anti-slide pile.

关 键 词：弹性抗滑粧 粧底支承条件法 粧身内力'立移 地基系数 MATLAB软件 

分 类 号：X43[环境科学与工程—灾害防治] TU473.1[建筑科学—结构工程]