碎石土密实度对地基水平承载力影响研究  

Preliminary study on influence of gravel soil compactness on horizontal bearing capacity of foundation

作　　者：黄宇轩 赵其华 刘斌[3] 刘俊鹏 HUANG Yuxuan;ZHAO Qihua;LIU Junpeng;LIU Bin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu 610059,China;College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点试验室,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 [3]江西省地质环境监测总站,江西南昌330095

出　　处：《人民长江》2019年第5期180-184,204,共6页Yangtze River

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：地基土密实度是影响地基水平抗力系数的比例系数m值的重要因素之一。通过室内物理模拟试验,使用碎石土作为地基模型材料,将地基土密实度进行了量化。通过单桩水平静载试验,获得不同地基密实度的情况下地基水平承载力特征值及m值的变化规律,为桩基设计提供参考依据。试验研究表明:①增大碎石土地基的密实度可以显著提高单桩水平承载力及m值;②密实度与地基参数m值呈线性关系;③碎石土地基密实度每提高20%,m值增加1.39倍,水平承载力特征值增加1.38～3.01倍。The compactness of foundation soil is one of the important factors affecting the m value of the horizontal resistance coefficient of the foundation. The compactness of foundation soil,with gravel soil as the foundation model material,is qualified by indoor physical simulation test. Through the horizontal static load test of single pile, the law of the characteristic value and m value of the horizontal bearing capacity of the foundation under different foundation compactness is obtained to provide a reference for the design of the pile foundation. The experimental study shows that:(1) Increasing compactness of the gravel soil foundation can significantly improve the horizontal bearing capacity and m value of the single pile;(2) The density keeps a linear relation with the m value of the foundation;(3) Density increase of the gravel soil foundation by 20% can lead to the amplification the m value by 1.39 times, and the horizontal bearing capacity characteristic value by 1.38~3.01 times.

关 键 词：水平承载力 密实度 碎石土地基 M值 单桩水平静载试验 

分 类 号：P642[天文地球—工程地质学]