不同方法求解疏排水引起的地面沉降对比研究

A comparative study of land subsidence caused by drainage with different methods

地下水开发利用和疏排水过程引起的地面沉降是一个渗流场与应力场耦合的过程。基于算例模型,分别采用目前常用的基于渗流-沉降分步计算的土力学经验公式、渗流-沉降部分耦合的GMS软件中SUB模型以及目前少用的基于渗流-沉降全耦合的COMSOL Multiphysics模型对疏排水引起的地面沉降量进行了计算。对比不同方法计算结果表明,COMSOL Multiphysics计算疏排水引起的地面沉降可行且计算结果较经验公式法、GMS中SUB模型的结果更为合理、更符合实际沉降特征。在此基础上,采用COMSOL Multiphysics和GMS中SUB模型对比研究了不同渗透系数对地面沉降计算的影响,结果进一步验证了COMSOL Multiphysics求解疏排水引起地面沉降的可靠性。

Land subsidence caused by groundwater exploitation and drainage is a process of coupling between the seepage field and the stress field.An example based on the model,using the current flow-settlement formula of soil mechanics calculation based on the commonly used step by step,seepage and settlement of partially coupled GMS software SUB model and the current use of drainage caused by COMSOL multiphysics model based on coupling seepage and settlement of ground settlement are calculated.Comparing the results of different methods,it is feasible to calculate land subsidence caused by drainage by COMSOL Multiphysics.The calculated results are more reasonable than the empirical formula method and the SUB model in GMS,which are more consistent with the actual settlement characteristics.The influence of different coefficients of permeability on the calculation of land subsidence is compared with the SUB model in COMSOL multiphysics and GMS.The results further verify the reliability of COMSOL multiphysics for solving the land subsidence caused by drainage.