碎石土斜坡土体水平抗力分布规律研究  

STUDAY ON HORIZONTAL RESISTANCE DISTRIBUTION OF GRAVEL SOIL SLOPE

作　　者：陈继彬[1] 赵其华[1] 彭社琴[1] CHEN Jibin;ZHAO Qihua;PENG Sheqin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection（Chengdu University of Technology）,College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059)

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

出　　处：《工程地质学报》2018年第4期959-968,共10页Journal of Engineering Geology

基　　金：国家自然科学基金面上项目(41272333);国家重点基础研究发展计划(2011CB013501)资助

摘　　要：斜坡上或临近斜坡顶部设置工程结构(桩基础)时,桩身变形将导致基桩对桩侧岩土体产生水平挤压作用,如果因桩身变形过大而导致桩前坡体失稳,即桩侧岩土体抗力弱化甚至消失,则会引发工程事故,土体抗力的实际分布规律并未探明。本文统计分析碎石土斜坡场地4根桩基(深入覆盖层)的水平静载荷试验数据,来分析同一坡度碎石土场地土体水平抗力沿深度的变化、土体抗力随桩身位移的变化特点,进而获得土体在不同抵抗变形阶段(弹性、塑性阶段)土体水平抗力分布的一般规律。The building structure in the southwest of China crosses into the mountain areas. Many pile foundations are located in slope terrain grounds that the overburden is gravel soil. The pile-soil interaction caused by pile deformation can generate soil horizontal resistance. If the soil resistance is too small to prevent slope deformation,the slope can be unstable and destroyed. However,the existing codes do not provide the methods to calculate the soil resistance on slope ground. This paper presents four piles that are in gravel soil under in-situ lateral loading tests on terrain with 30° slope angle. Based on the measured data,the relationship between deflection and soil resistance for the four piles is compared. The results of the above analyses are used to establish the mode of horizontal resistance distribution for gravel soil slope ground in elastic and plastic phases.

关 键 词：碎石土 斜坡 土体水平抗力 桩基础 

分 类 号：TU443[建筑科学—岩土工程] P642[建筑科学—土工工程]