承压水条件下基坑抗突涌安全措施分析  

Safety Measures for Anti-surge Stability of Deep Excavation under Artesian Groundwater

作　　者：李雄威 何亮[3] 黄开林 秦羽[3] LI Xiongwei;HE Liang;HUANG Kailin;QIN Yu(Jiangsu Tunnel and Underground Engineering Research Center,Nanjing 210041;Jiangsu Geo-Engineering Investigation Institute,Nanjing 210041;School of Civil Engineering Architecture,Changzhou Institute of Technology,Changzhou 213002)

机构地区：[1]江苏省隧道与地下工程技术研究中心,南京210041 [2]江苏南京地质工程勘察院,南京210041 [3]常州工学院土木建筑工程学院,江苏常州213002

出　　处：《土工基础》2020年第5期602-606,611,共6页Soil Engineering and Foundation

基　　金：江苏省第五期“333工程”培养资金(BRA2016113);江苏省隧道与地下工程技术研究中心开放基金资助项目。

摘　　要：以常州地铁2号线青枫公园站标准段深基坑工程为研究对象,利用有限元软件Plaxis建立承压水作用下的基坑开挖计算模型,计算承压水对基坑及周围环境的影响,对比分析布置降压井和增加地连墙深度两种措施的作用效果。对基坑及环境变形状态进行分析,结果表明:增加地连墙深度远不如布置降压井的措施有效,针对常州城区有Ⅰ-2承压水分布的区域,建议采取按需降压措施,预防基坑突涌,控制环境变形,建议承压水水头降至12 m。In this paper,an example of the deep foundation excavation project of Qingfeng Park Station in Changzhou Metro Line 2 is presented.The finite element software was used to establish an analytical model for the deep excavation under the artesian groundwater conditions.The stability of the excavation under the confined water conditions and the surrounding environment were analyzed.The effect of deformation was studied to reduce the height of water head and increase the depth of the ground connecting wall by well points to control the stability of the excavated areas and the deformation of the adjacent environment.The results show that the effect of increasing the depth of the ground wall on the stability of the deep excavation under the artesian groundwater conditions and the deformation control of the surrounding environment is far less effective than the arrangement of a depressurization well to reduce the groundwater height.Groundwater pressure reduction measures to prevent surges in the excavated bottom and the control the deformation of the surrounding environment are also resented in the paper.

关 键 词：基坑开挖 数值模拟 基坑抗突涌 环境变形控制 

分 类 号：TU473[建筑科学—结构工程]