深圳上软下硬地层中超深基坑的性状分析  

Analysis on the Performance of Ultra-Deep Foundation Pit in Weathered Rock Ground Covered by Sand in Shenzhen

作　　者：吴双武[1,2] 李辉[1,3] 许烨霜[1,2] 沈水龙[1,2] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]海洋工程国家重点实验室,上海200240 [3]中铁十六局深圳项目部,广东深圳518031

出　　处：《地下空间与工程学报》2016年第2期330-335,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41102175)

摘　　要：深圳地层上部为松散的富水性砂性土与黏性土沉积地层,10 m以下为风化花岗岩地层,在此地层中施工超深基坑需要防止上部松散土层的变形。运用数值模拟方法对深圳地层某超深基坑工程进行模拟分析。数值模拟中把包括地基土体在内的整个围护结构作为一个结构体系。考虑开挖过程、围护结构和土的共同作用、时间等因素的影响,实现对施工逐级开挖、支撑的装拆进行动态模拟,综合分析围护结构的内力、变形及开挖引起的环境效应。数值模拟结果符合实际工程情况和规范要求,得出的结论适用于深圳地区类似基坑工程的变形预测和优化设计。The upper strata of the ground in Shenzhen city is composed of loose sandy soil and clayey soil with high water content,and the deformation of soil should be avoided when an ultra-deep foundation pit is excavated in weathered granite strata at a depth of 10 m below the ground surface. This paper simulated an ultra-deep foundation pit in Shenzhen FEM. The entire building envelope is taken as a structural system in the numerical simulation method. Considering the joint action of excavation process,retaining structures and soil,this paper achieved the progressive dynamic simulation of construction,including excavation,support system assembling and disassembling. The environmental effects caused by the internal forces and deformation of retaining structures and excavation were also analyzed. Results of the numerical simulation are similar to the actual engineering situation and meet the requirements of code. The conclusions can be used for the deformation prediction and the design optimization of similar foundation pit.

关 键 词：深圳地层 基坑开挖 围护结构 环境影响 数值模拟 

分 类 号：O319.56[理学—一般力学与力学基础]