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针对深基坑降水引起地面沉降给周边环境带来的问题,基于最优化法的降水设计方案,以地下水动力学原理和耦合固结理论为基础,建立地下水渗流场和应变场耦合数学模型。以某地长江大桥锚碇基坑为例,采用有限差分数值分析法求解,模拟得到最优化降水的渗流场和地面沉降量,以及地面沉降主要影响因素的影响程度。模拟结果表明,基于最优化法降水设计能够达到设计要求,产生的长江大堤沉降量较小,其中渗透系数的变化对地面沉降影响较大,长江定水头边界和基坑防渗墙一定程度上减小了地面沉降量。
In view of the problems caused by surface subsidence caused by precipitation in deep foundation pit to the surrounding environment, the precipitation design scheme based on optimization method is established based on groundwater hydrodynamics and coupling and consolidation theory, and a coupled groundwater seepage and strain field mathematical model is established. Taking the anchorage foundation pit of a certain Yangtze River Bridge as an example, finite difference numerical method is used to solve the problem. The seepage field and ground subsidence of the optimal precipitation and the influence degree of the main factors of land subsidence are simulated. The simulation results show that the design of precipitation based on optimization method can meet the design requirements, resulting in less settlement of the Yangtze River dike, in which the permeability coefficient changes have a greater impact on the land subsidence, the Yangtze River boundary and foundation pit cut-off wall to some extent reduced Small amount of ground subsidence.