基坑回弹变形计算方法研究及应用  

RESEARCH AND APPLICATION OF CALCULATION METHODS FOR REBOUND DEFORMATION OF FOUNDATION PITS

作　　者：李德宁[1,2] 楼晓明[1,2] 杨敏[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩石力学与工程学报》2012年第9期1921-1927,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50978201)

摘　　要：基坑卸荷回弹变形计算对基坑稳定性分析具有重要意义。现阶段基坑回弹量估算方法有几种,包括传统估算方法、经验公式、残余应力法等,但估算结果往往与实测值相差较大。根据坑底土残余应力为开挖卸荷坑底土层回弹影响范围内有效自重应力原理的方法,以自重应力修正偏大的卸荷应力,配合常规压缩试验所得回弹模量或提出的经验公式估算回弹模量,给出一种新型实用基坑回弹变形计算方法。该方法概念清晰,易于操作,可计算出影响范围内任意深度回弹量,经与实测对比分析,证明该方法计算结果可靠,概念清晰,具有一定的先进性,对完善基坑设计理论具有重要意义。The rebound deformation of foundation pits has significant influence on their stability. Nowadays, there are several calculation methods for rebound deformation, such as traditional method, empirical formula, residual stress method and so on. But there were always obvious errors between calculation results and measured values. According to the residual stress equal to the weight of removed soil, the larger unloading stress can be modified by residual stress. The corresponding rebound modulus can be gotten through the ordinary compression tests or empirical formulas. A new practical calculation method for rebound deformation was proposed. The conception of the method is easier to be understood and to be put into effect. The rebound deformation at any depth below the ground surface can be calculated by the method. By comparing the calculating results to the measured values, the method was proved to be feasible and advanced. It is of great significance to improve the design theories of foundation pits.

关 键 词：基坑工程 残余应力 回弹变形 影响深度 

分 类 号：TU473[建筑科学—结构工程]