富水地层基坑群开挖降水及水位变动影响研究  

Study on the influence of precipitation and water level change in excavation of foundation pit group in water-rich strata evaluation

作　　者：唐林 崔立根 王经伦 朱利明[2] 邵毅安 Tang Lin;Cui Ligen;Wang Jinglun;Zhu Liming;Shao Yi’an(Jiangsu Leiwei Construction Engineering Co.,Ltd.,Nanjing 210003,China;Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]江苏雷威建设工程有限公司,江苏南京210003 [2]南京工业大学,江苏南京210009

出　　处：《山西建筑》2022年第11期68-72,共5页Shanxi Architecture

摘　　要：为研究富水地层基坑群开挖的影响,基于杭州民祥路市政道路工程,利用MIDAS GTS NX软件建立有限元模型,对比分析了无水地层和富水地层条件下单一基坑和基坑群开挖降水的影响,并分析了基坑群开挖邻近桥梁墩柱变形和铁路路基变形,以及坑外地下水位变动对基坑围护结构变形的影响。结果表明:无水地层条件下单个基坑开挖的影响范围约为2H,富水地层条件下的影响范围约为4H;无水地层条件下基坑群开挖的影响范围约为2.5H_(max),富水地层条件下的影响范围约为5H_(max);富水地层基坑开挖对周边地表及邻近构筑物的影响均比无水地层大,富水地层的路基沉降峰值差(最大峰值-最小峰值)是无水地层的2.2倍左右;短时间内坑外水位变动会使基坑围护结构产生少量变形。To study the effect of excavation of foundation pit group in water-rich stratum.Based on the municipal road project of Minxiang Road in Hangzhou,the finite element model was established by using MIDAS GTS NX software to compare and analyze the influence of precipitation of single pit and pit group excavation under the conditions of waterless stratum and water-rich stratum,and the influence of deformation of bridge piers and railroad roadbed adjacent to pit group excavation,as well as the influence of groundwater level change outside the pit on the deformation of pit enclosure structure.The results show that:the influence range of single pit excavation under the condition of waterless stratum is about 2H,and the influence range under the condition of water-rich stratum is about 4H;the influence range of pit group excavation under the condition of waterless stratum is about 2.5H_(max),and the influence range under the condition of water-rich stratum is about 5H_(max);the influence of pit excavation under the condition of water-rich stratum on the surrounding surface and adjacent structures is larger than that of waterless stratum,and the peak settlement of road foundation under the condition of water-rich stratum is larger than that of water-rich stratum.The peak difference of roadbed settlement(maximum peak-minimum peak)of water-rich strata is about 2.2 times of that of water-free strata;the change of water level outside the pit within a short time will cause a small amount of deformation of the pit enclosure structure.

关 键 词：基坑群 基坑开挖 水位变动 

分 类 号：TU463[建筑科学—结构工程]