基于离散元模型的深基坑降压井模拟分析及沉降控制

在深基坑施工过程中,基坑围护及降排水措施是保障安全施工及工程质量的重要环节。常规降排水方案在满足正常施工的前提下,保持基坑底水位处于一定深度以下,并减小对周围环境的影响。在基坑底存在承压含水层时,应充分考虑基坑突涌风险,采取有效降压措施保持基坑稳定。本文针对存在承压含水层的深基坑降水,采用离散元模型进行数值模拟,检验方案的降水、降压效果及对周边沉降影响,为建筑施工提供行之有效的降排水方案。

Numerical simulation analysis of step-down well in deep foundation pit based on the discrete element model

In the process of construction of foundation pit construction,foundation pit retaining and draining measures is an important link in guaranteeing construction safety and engineering quality.On the premise of meet the normal construction,conventional draining scheme keeps the water level at a certain depth below foundation pit bottom,and reduces the impact on the surrounding environment.If confined aquifer is below the bottom of the foundation pit,the pit outburst flood risk should be considered,and stability of the foundation pit should be maintained by the effective decompression measures.Precipitation design of deep foundation pit containing confined aquifer was simulated by the discrete element model,precipitation,decompression effect and the impact on the subsidence were tested,effective drainage design was provided for the construction.