水平受荷桩桩土相互作用研究  

Interaction of Pile-soil in Horizontal Loaded Piles

作　　者：戈迅 赵其华[1,2] 薛秋池[1,2] GE Xun;ZHAO Qihua;XUE Qiuchi(State Key Laboratory of GeoHazard Prevention and GeoEnvironment Protection, Chengdu University of Technology,Chengdu, Sichuan 610059, China;College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]成都理工大学环境与土木工程学院,四川成都610059

出　　处：《水利与建筑工程学报》2018年第1期36-39,47,共5页Journal of Water Resources and Architectural Engineering

基　　金：国家重点基础研究发展计划项目(2011CB013501);长江学者和创新团队发展计划项目(IRT0812)

摘　　要：水平受荷桩通过调动桩周土体的抗力来抵抗水平荷载,现有对于水平受荷桩桩土相互作用的研究主要集中在桩身的变形模式上,而忽略了桩土相互作用过程中桩周土体及其抗力的变化。针对这个问题,进行了不同坡度的斜坡场地单桩水平荷载现场实验。研究了加载过程中桩土相互作用和其变化过程,并对被动土压力的变化进行了分析研究。实验结果表明:桩后、桩前被动土压力总值之比随荷载的增加都出现一个先下降后上升,最后趋于平稳的过程;桩后被动土压力相对于桩前被动土压力对桩基础稳定性的影响更大;随着坡度的增加,桩后被动土压力所起到的作用在桩土作用后期会明显增加。Horizontally loaded piles are able to resist horizontal loads by mobilizing the resistance of piles.The existing researches on pile soil interaction of laterally loaded piles mainly focus on the deformation mode of piles,therefore ignore the changes of soil around piles and their resistance.In order to solve this problem,a field experiment of horizontal load of single pile in a slope site with different slopes is carried out.The interaction and change process of pile and soil during loading process are studied,and the change of the passive earth pressure is analyzed.The experimental results show that the ratio of the total passive earth pressure behind piles and the total passive earth pressure before piles increases with the increase of loads,then decreases first and then rises,finally tends to be stable.The effect of passive earth pressure be-hind pile on the stability of pile foundation is greater than the effect of passive earth pressure before pile on the stability of pile foundation.With the increase of slope,the role played by the passive earth pressure behind pile will increase ob-viously in the late stage of pile-soil interaction.

关 键 词：水平荷载 桩土相互作用 桩后被动土压力 斜坡坡度 

分 类 号：TU473.1[建筑科学—结构工程]