双圆环形超深基坑支护结构的数值模拟与监测分析  

Numerical Simulation and Monitoring Analysis of Double-ring Bracing System in Super Deep Foundation Pit

作　　者：陈希[1] 徐伟[1] 段朝静[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《同济大学学报（自然科学版）》2012年第2期179-185,共7页Journal of Tongji University:Natural Science

摘　　要：结合某锚碇基础双圆环形超深基坑支护结构的工程实例,采用全三维有限元分析方法模拟整个基坑的施工开挖过程,考虑土和支护结构的相互作用,并结合现场的监测数据进行对比分析,得出了双圆环形超深基坑支护结构的变形特征和受力特性,以及周围土体的变形特征和塑性区分布.从结果看出双圆环形超深基坑具有明显的空间效应和拱效应特点,按照传统方法进行设计是偏于保守的;同时因双圆环形超深基坑支护结构本身变形较小,所以内衬由于地下连续墙位移而产生的内力并不占主导地位,而施工期间的温度变化等其他因素对其受力有很大影响,因而,内衬环向应力基本以受拉为主.A study was made of the deformation law and the mechanics characteristic of the double-ring bracing system in super deep foundation pit through numerical simulation and monitoring analysis. Based on the example of double-ring bracing system in foundation pit for anchor, the full three- dimensional finite element model was used to simulate the excavation of the whole foundation pit. Interaction between the bracing structure and the soil were also taken into account into calculation. Compared with the measured, the results indicate that traditional design is conservative when applied to the design of d6uble-ring bracing system characterized by space effect and arching effect, and the stress of lining is affected mainly by temperature change during the construction rather than the deformation of concrete diaphragm wall due tothe small deformation of bracing structure.

关 键 词：超深基坑 双圆环形支撑体系 三维有限元 接触 受力和变形 

分 类 号：TU94[建筑科学—建筑技术科学]