软土地区沉井施工引起地表沉降预测计算方法  

Predicted Calculating Method of Surface Subsidence Caused by Caisson Construction in Soft Soil

作　　者：谢晓蕾 何金辉 李明广[1] 唐宏华 陈锦剑[1] Xie Xiaolei;He Jinhui;Li Mingguang;Tang Honghua;Chen Jinjian(Department of Civil Engineering,Shanghai Jiao tong University,Shanghai 200240,P.R.China;China Railway 24 th Bureau Group Co Ltd.,Shanghai 200433,P.R.China)

机构地区：[1]上海交通大学土木工程系,上海200240 [2]中铁二十四局,上海200433

出　　处：《地下空间与工程学报》2024年第1期241-250,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41977216);上海市科委科技攻关项目(18DZ1205304);上海市优秀学术带头人计划(20XD1422100)。

摘　　要：沉井已被广泛应用于软土区的地下空间建设,但其下沉过程引起的地表沉降大小及分布不清,缺乏预测方法。本文以上海地区某沉井工程为背景,基于上海典型土层的HSS模型计算参数,采用有限差分法模拟圆形沉井下沉,基于对96个数值结果的系统分析和归一化研究,提出了一套沉井施工引起的地表沉降快速预测方法。该方法能够综合考虑沉井直径B、下沉深度H和井内留土高度h对地表沉降的影响。最后采用该计算方法预测了5个工程的地表沉降并同实测数据进行了对比,结果表明,该方法能够很好地预测软土区的沉井施工引起的地表沉降,可为快速评估沉井施工的环境效应提供有效方法。Open caisson has been widely used in the construction of underground space in soft soil area,but the distribution of surface subsidence caused by its settlement process is not clear and there is no prediction method.Based on the background of a caisson project in Shanghai area and the calculation parameters of HSS model of typical soil layer in Shanghai,this paper simulates the sinking of circular caisson by finite difference method.Based on the systematic analysis and normalization study of 96 numerical results,a fast prediction method of surface settlement caused by caisson construction is put forward.This method can comprehensively consider the influence of sinking diameter B,sinking depth H and plug height h in the well on surface settlement.Finally,the ground settlement of 5 projects is predicted by this calculation method and compared with the measured data.The result shows that this method can well predict the ground settlement caused by the construction of caisson in soft soil area,and it can provide an effective method for quickly evaluating the environmental effects of caisson construction.

关 键 词：沉井 地表沉降 数值方法 软土 

分 类 号：TU91[建筑科学—建筑理论]