单井与群井抽水引发地面沉降数值模拟研究  

NUMERICAL SIMULATION STUDY ON THE GROUND SUBSIDENCE INDUCED BY SINGLE WELL AND MULTI-WELL PUMPING

作　　者：罗奇端 苏朋辉 晏泽霖 柯一帆 张宏锰 LUO Qiduan;SU Penghui;YAN Zelin;KE Yifan;ZHANG Hongmeng(China Railway Fourth Bureau Group Shanghai Engineering Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]中铁四局集团上海工程有限公司,上海200070

出　　处：《低温建筑技术》2025年第2期76-80,共5页Low Temperature Architecture Technology

摘　　要：复杂场地条件下,基于不同抽水试验反演的水文地质参数差异很大。为研究不同方式抽水试验对基坑降水诱发地面沉降预测的影响,文中基于同一场地的单井、群井抽水试验结果,采用Modflow以及FLAC 3D分别建立三维渗流模型以及沉降模型进行地面沉降计算,并结合现场监测数据对比分析了沉降趋势及最终沉降值。结果表明在本场地条件下单井反演的渗透系数和贮水系数均大于群井试验反演值;抽水试验方式的不同并不会影响沉降趋势;在进行基坑降水开挖的短期地面沉降计算,单井和群井抽水试验都有不错的拟合结果;在对地面最终沉降的预测中,单井结果偏差较大,群井抽水试验预测效果较好。研究为预估降水带来的环境影响提供合理的依据,而且研究实现了通过不同试验反演水文地质参数,为更加准确地得到地面沉降值的降水方法提供了理论依据。Under complex site conditions,hydrogeological parameters derived from different pumping test methods can sometimes vary significantly.To study the impact of various pumping test methods on predicting ground settlement induced by foundation pit dewatering,this paper uses the results of single-well and multi-well pumping tests conducted at the same site.Based on these results,three-dimensional seepage and settlement models are established using Modflow and FLAC 3D,respectively,to calculate ground settlement.A comparative analysis of settlement trends and final settlement values was performed using field monitoring data.The results show that the permeability coefficient and storage coefficient derived from single-well tests are greater than those obtained from multi-well tests at this site.The method of pumping tests does not affect the settlement trend.For short-term ground settlement calculations during foundation pit dewatering,both single-well and multi-well pumping tests yield good fitting results.However,for predicting final ground settlement,single-well test results exhibit larger deviations,while multi-well test predictions are more accurate.This study provides a reasonable basis for assessing the environmental impact of dewatering and offers a theoretical foundation for selecting dewatering methods to more accurately predict ground settlement values by leveraging hydrogeological parameters derived from different tests.

关 键 词：基坑降水 单井抽水试验 群井抽水试验 地面沉降 

分 类 号：TU433[建筑科学—岩土工程]