基于基坑施工工况及环境要求的地下水控制设计

Based on the requirement of foundation pit construction condition and environment of groundwater control design

基坑工程设计的安全性与地下水控制设计密不可分。本文根据基坑施工中的各种工况及环境保护的要求对由于地下水的作用而产生的浮力、渗流、地面变形、突涌等问题进行计算分析,并根据计算分析结果及地下水作用机理采取相应的应对控制措施。地下水控制设计所涉及的基坑施工工况主要有:基坑开挖前、基坑开挖中、基坑开挖至坑底、底板浇筑完成、地下每层建筑施工及回填完成;环境保护要求主要有:基坑内外地下水位控制、基坑外建(构)筑物的变形控制、围护墙体本身的各类变形控制等。针对各工况及环境要求而进行的地下水控制设计为基坑工程安全有效的施工提供了保障和指导,确保了基坑及周边环境的安全,也为类似基坑工程的地下水控制设计提供了借鉴。

The security of foundation pit engineering design and groundwater control design are inseparable. According to the foundation pit construction and environmental protection requirements under various working conditions in the produced by the action of groundwater buoyancy, seepage, ground deformation calculation and analysis, the problem such as a sudden surge, and according to the results of calculation and analysis and effect mechanism of groundwater to take corresponding control measures. Groundwater condition of construction of foundation pit in the control design, mainly include： before the excavation, excavation, excavation to bottom,bottom pouring in complete,each layer of underground construction and backfilling;Environmental protection requirements are：inside and outside the foundation pit of underground water level control,outside the foundation pit, the deformation control of content,retaining wall itself of all kinds of deformation control, etc.T For each condition and environmental requirements of the groundwater control design provides guarantee for the construction of the foundation pit engineering safe and effective and guidance,ensure the safety of the excavation and surrounding environment,also for similar excavation engineering of groundwater control design provides reference.