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为节约宝贵的地下水资源,北京等城市的管理部门提出在一定条件下必须采用基坑周边隔水,在坑内进行施工降水的政策法规。坑内降水将导致围绕支护结构渗流的发生,从而影响到作用在支护结构上的土水压力。而在一般情况下计算基坑支护结构上的土水压力时,由于没有考虑地下水渗流的影响,因此计算结果可能出现偏差。本文首先探讨了基坑渗流情况下支护结构上水压力简化计算的一般表达式,然后用数值模拟的方法分析了几种典型情况下基坑渗流对水压力的影响,并与简化计算的结果进行了对比,给出了相应的水压力分布模式图。最后通过一个工程实例的计算说明了考虑渗流对基坑水压力的影响。
In order to save precious groundwater resources, the management departments in Beijing and other cities proposed that under certain conditions, the policies and regulations on water separation around foundation pit and precipitation in the pit should be adopted. Precipitation in the pit will cause seepage around the support structure, thus affecting the soil-water pressure acting on the support structure. In general, when calculating the soil-water pressure on the foundation pit supporting structure, the calculation results may be deviated due to the effect of groundwater seepage is not considered. In this paper, firstly, the general expression of simplified calculation of water pressure on the supporting structure under the condition of foundation pit seepage is discussed. Then the influence of the seepage of foundation pit on the water pressure under several typical conditions is analyzed by numerical simulation and compared with the simplified calculation The comparison of water pressure distribution patterns is given. Finally, the calculation of an engineering example shows that considering the influence of seepage on the water pressure of foundation pit.