地下构筑物对地下水渗流的阻挡效应

针对地下构筑物改变了地下水渗流条件这一问题,建立三维有限元模型.该模型是地下水渗流与地面沉降计算的一体化模型,采用该模型分析地下构筑物对地下水渗流的阻挡效应.该方法在地下水渗流计算中考虑三维地下水渗流,在土体固结计算中采用基于Terzaghi固结理论的一维固结方法.结果表明,地下构筑物对地下水及地面沉降的影响程度与构筑物在含水层中的埋置深度及挡水宽度有关.地下构筑物的埋置深度越深,抽水侧水位降深及沉降量越大.构筑物对水流的阻挡宽度越大,对地表沉降的影响越大.

Cutoff effect of groundwater seepage due to existence of underground structure

A three dimensional finite element model was established to analyze the cutoff effect of groundwater seepage due to the existence of underground structure. The model was an integrative model by considering groundwater seepage and soil consolidation. The groundwater seepage was simulated in three dimensional condition, and the compression of soil layers was calculated in one dimensional consolidation based on Terzaghi consolidation theory. Numerical results indicate that the degree of this kind of impact depends on the depth and width of the underground structures penetrated into the aquifer. The drawdown of groundwater level and land subsidence at the lower side of the underground structure increases with the increase of the inserted depth of the wall in soil,and increases with the increase of the width of the wall.