承压水基坑变形稳定性因素影响分析  

Analysis of Influence Factors of Foundation Pit Deformation Stability under Confined Water

作　　者：秦羽 李雄威[2] 刘正明 肖金花 QIN Yu;LI Xiong-wei;LIU Zheng-ming;XIAO Jin-hua(School of Environmental & Safety Engineering, Changzhou University, Changzhou 213032, China;Changzhou Institute of Technology Civil Engineering, Changzhou 213032, China;The 2nd Geological Brigade of Jiangsu Geology & Mineral Exploration Bureau, Changzhou 213300, China;Changzhou Rail Transit Development Co.,Ltd., Changzhou 213000, China)

机构地区：[1]常州大学环境与安全工程学院,常州213032 [2]常州工学院土木建筑工程学院,常州213032 [3]江苏省地质矿产局第二地质大队,常州213300 [4]常州市轨道交通发展有限公司,常州213000

出　　处：《科学技术与工程》2020年第31期12974-12979,共6页Science Technology and Engineering

基　　金：江苏省地矿局委托科研项目(2017-KY2);常州市轨道交通发展有限公司科研项目(2018)。

摘　　要：以常州地区青枫公园地铁深基坑为例,利用Plaxis有限元软件建立基坑模型,并将计算结果与现场监测成果进行了比较,验证数值模拟计算的准确性。在此基础上,分析了基坑在承压水条件下的变形稳定特征,对围护墙入土深度、不透水层厚度、承压水降压幅度等进行参数探讨。结果表明:基坑开挖数值模拟手段合理,符合实际工况。随着承压水头的降低、地连墙深度增加以及不透水层厚度增大,围护墙体水平变形减小,基坑趋于更稳定。工程中需结合实际情况制定相应的抗突涌方案,确保基坑稳定,节约工程成本。The deep foundation pit of Qingfeng Park Subway in Changzhou area was taken as an example,and the PLAXIS finite element software was used to establish the foundation pit model.The simulation results were compared with the on-site monitoring results to verify the accuracy of the digital-to-analog calculation.On this basis,the parameters of the depth of the retaining wall,the thickness of the impervious layer and the pressure drop of the confined water were discussed.The results show that the numerical simulation of foundation pit excavation is reasonable and meets the actual working conditions.With the reduction of the confining head and the increase of the depth of the ground wall and the thickness of the impervious layer,the horizontal deformation of the retaining wall is reduced,and the foundation pit tends to be more stable.In the project,a variety of foundation pit anti-surge stability measures should be made with the considering of the actual situation.It can ensure the stability of the foundation pit and reduce the engineering cost.

关 键 词：基坑突涌 数值模拟 现场监测 参数分析 变形 

分 类 号：TU463[建筑科学—结构工程]