基坑周边荷载引起支护结构上土压力的分析  

ANALYSIS OF EARTH PRESSURE ON THE RETAINING STRUCTURE DUE TO SURCHARGE NEAR THE EXCAVATION

作　　者：王洪亮[1] 宋二祥[1] 宋福渊 

机构地区：[1]清华大学土木工程系,北京100084 [2]中国建筑股份有限公司技术中心,北京101300

出　　处：《工业建筑》2012年第9期90-95,60,共7页Industrial Construction

摘　　要：通过理论分析和数值模拟对现行规范规程中有关基坑周边局部荷载引起支护结构上附加土压力的计算进行讨论。从弹性理论解确定了附加土压力值最大点的位置;利用有限元法对比分析了土体抗剪参数c和φ对附加土压力弹塑性解的影响,发现其与静止侧压力系数呈正比;针对土体分层情况,利用有限元法分析附加土压力的分布形式,并与均质地基时的情况进行对比;针对基坑周边建筑物荷载的作用,分析基础埋深对附加土压力的影响。In this paper,earth pressure on the retaining structure due to surcharge near the excavation was analyzed,and the proposals from different technical codes were compared.The location of the maximum additional pressure was determined according to the theoretical elastic solution.The influence of soil friction angle φ and cohesion c on elastic-plastic solution of the additional earth pressure was investigated by using finite element method,and it was found that the additional earth pressure and the static pressure were directly proportional.For layered soil,the additional earth pressure was compared with that for homogeneous soil and their difference was shown.When the surcharge was caused by buried foundation nearby,the influence of the embedment depth of the foundation on the additional earth pressure was analyzed.

关 键 词：附加土压力 超载 基坑开挖 土体分层 埋深 

分 类 号：TU432[建筑科学—岩土工程]