Study on the coupling model of seepage-land subsidence considering variations in total stress and soil parameters during foundation pit dewatering
To investigate the mechanisms and calculation methods of land subsidence caused by foundation pit dewatering under the condition of variations in total stress and soil parameters,a three-dimensional numerical model of groundwater seepage in the study area is constructed in this research,with the foundation pit dewatering project in the head inverted siphon section of the Xixiayuan Water Conservancy and Irrigation Project as a case.The changes in stress,parameters and subsidence during the dewatering process of foundation pit are analyzed and compared by the method of theoretical derivation and case study.Calculation formula and methodology of seepage-subsidence coupling model in view of variation in total stress and soil parameters are proposed,and the calculation results of land subsidence under different theoretical models are compared and analyzed.The results show that the seepage-subsidence coupling model built in consideration of variation in total stress and soil parameters has the smallest calculation value and the best fitting effect with the measured value.This can reasonably explain the phenomenon that the calculated subsidence value is obviously greater than the measured value in the previous studies,which is more consistent with the actual subsidence process.The research outcomes are able to provide references and guidance for land subsidence prediction in similar projects,which is of great practical significance.
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