摘要
为有效减小地表沉降,针对富水粉砂土地质条件下深基坑降水对周边环境影响较大的问题,提出了坑外回灌井和止水帷幕两种优化措施。依据渗流-应力耦合理论,采用有限元分析方法建立了深基坑降水-回灌系统模型,并对不同工况下的地表沉降效应进行了数值模拟分析。研究结果表明:采用坑外回灌井后,地表沉降最大值减少至5.6 mm,为未采用回灌井工况的21.1%;增加止水帷幕深度后,地表沉降最大值分别减少0.92 mm(素墙增加3 m)、8.92 mm(素墙增加6 m)和10.72 mm(素墙增加9 m),但当素墙增加超过6 m后,减沉效果将趋于饱和。两种优化措施均能有效减小深基坑降水对周边环境的影响,并可通过合理选择止水帷幕深度实现减沉效果与经济性的平衡。
To effectively reduce surface settlement,this study addresses the issue of deep foundation pit dewatering under water-rich silty soil conditions,which significantly impacts the surrounding environment.Two optimization measures are proposed:external recharge wells and waterproof curtains.Based on the seepage-stress coupling theory,a deep foundation pit dewatering-recharge system model was established using the finite element method,and numerical simulations were conducted to analyze surface settlement effects under different working conditions.The results show that the maximum surface settlement is reduced to 5.6 mm with the use of external recharge wells,which is only 21.1%of that without recharge wells.By increasing the depth of the waterproof curtain,the maximum surface settlement is reduced by 0.92 mm(increased by 3 m),8.92 mm(increased by 6 m),and 10.72 mm(increased by 9 m),respectively.However,when the depth exceeds 6 m,the settlement reduction effect becomes saturated.Optimizing the design of external recharge wells and waterproof curtains effectively reduces the environmental impact of deep foundation pit dewatering and achieves a balance between settlement reduction and economic efficiency through the rational selection of waterproof curtain depth.
作者
曹犇
吕茂
CAO Ben;LYU Mao(POWERCHINA Huadong Engineering Corporation Limited,Hangzhou,Zhejiang 311122,China;China Electric Power Construction Jiangsu Survey and Design Institute Co.,Ltd.,Nanjing,Jiangsu 210000,China)
出处
《黑龙江交通科技》
2025年第12期79-83,共5页
Communications Science and Technology Heilongjiang
关键词
粉砂土
深基坑降水
数值模拟
回灌井
止水帷幕
silty soil
deep foundation pit dewatering
numerical simulation
recharge well
waterproof curtain
