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以兰州地铁1号线马滩站深基坑工程为依托,根据场地工程地质和水文地质条件,设计单井抽水试验及完整基坑降水工程,并完成了现场监测工作。得到各自的地下水位及地表沉降量的变化规律,对比发现两者水位变化趋势、沉降量基本相同。在裘布依假定的前提下首先求出基坑降水后地下水位的降落曲线方程,忽略土体的侧向变形及群井效应对降水效果的影响,采用分层总和法分别计算水位降落曲线上下疏干土与饱和土的地面沉降量,叠加后得到最终坑周地面沉降量。采用大型有限元软件对该基坑降水工程进行数值模拟,现场监测数据与数值计算及理论计算结果基本吻合,表明本文提出的计算方法具有较高的工程实用价值。
Based on the deep foundation pit project of Ma Tan Station of Lanzhou Metro Line 1, according to the site engineering geology and hydrogeological conditions, the single well pumping test and complete foundation pit dewatering project are designed and the on-site monitoring work is completed. Get their own variation of groundwater level and surface subsidence, compared the trend of water level change between the two, the settlement is basically the same. Based on the hypothesis of Qiu Buyi, firstly, the equation of landing curve of groundwater level after foundation pit dewatering is obtained, and the effect of lateral deformation and well-group effect of soil on precipitation effect is neglected. The stratified summation method is used to calculate the vertical and horizontal distribution Ground subsidence of dry soil and saturated soil, superimposed to get the final pit circumference of the ground subsidence. The large-scale finite element software is used to simulate the foundation pit dewatering project. The on-site monitoring data are in good agreement with the numerical and theoretical calculation results, indicating that the calculation method proposed in this paper has high engineering practical value.