考虑渗流影响的深基坑开挖三维弹塑性数值模拟

3D elastic-plastic numerical simulation on deep foundation pit excavation with considering dewatering effect

为了分析在降水影响下地铁车站基坑的稳定性和现场实测的精确性,以沈阳某地铁车站深基坑为研究对象,根据工程地质条件及围护结构的深度和基坑开挖深度,运用ABAQUS对基坑进行了地下水渗流与开挖的三维数值模拟分析,利用试验推理法来模拟渗流问题.对基坑降水条件下开挖和支护体系的变形情况进行了验证,并将模拟结果与实测值进行了对比.结果表明,理论分析和实际监测结果较吻合,该方法对ABAQUS在基坑渗流数值模拟方面具有良好的借鉴性.

To analyze the stability and field measurement accuracy of metro station foundation pit under dewatering effect, a certain metro station in Shenyang was taken as the research object, and the three-dimensional （3D） numerical simulation analysis for the groundwater dewatering and excavation of foundation pit was performed with ABAQUS according to the engineering geological conditions and the depth of both supporting structure and foundation pit excavation, The dewatering problem was simulated with the experimental organum method. The deformation situation of excavation and supporting structure under the dewatering condition of foundation pit was verified, and the simulated and measured results were compared. The results show that the theoretical analysis is in agreement with the actual monitoring results. And the proposed method can provide the good reference for the ABAQUS numerical simulation of dewatering of foundation pit.