考虑内坑影响的坑中坑基坑被动土压力叠加算法  

Superposition Algorithm for the Outer Pit Passive Earth Pressure Influenced by Inner Pit for Pit-in-Pit

作　　者：申明亮[1] 廖少明[1] 邵伟[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《上海交通大学学报》2012年第1期79-83,88,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(51078292)

摘　　要：以Coulomb土压力理论为基础,考虑内坑的影响,采用叠加原理分析坑中坑基坑的外坑被动土压力,根据滑裂楔体的不同形状,分别给出4种具体计算公式,并通过具体算例对比了本文算法与《上海市基坑工程技术规范》中推荐算法的计算结果.结果表明:内坑的存在,将降低坑中坑基坑的外坑被动土压力;如果以《上海市基坑工程技术规范》中推荐的算法为理论依据设计坑中坑基坑,将会高估基坑的稳定性而使设计偏于危险.The concerning passive pressure was analyzed based on Coulomb soil pressure theory and superposition principle.According to different shapes of slide wedges,four analytical models and formulas were proposed respectively.The mechanical results calculated by the method in this paper and that of Shanghai technical code for excavation engineering were compared,which demonstrates that the existence of inner pit will greatly reduce the passive pressure of outer one while the design based on Shanghai technical code for excavation engineering will lead to overestimating stability of pit-in-pit excavation.

关 键 词：坑中坑 内坑 被动土压力 力矩叠加法 

分 类 号：TU443[建筑科学—岩土工程]