水文地质工程地质2026，Vol.53Issue(2)：105-114,10.DOI:10.16030/j.heg.202412074
强渗透地层管井降水的滤料设计方法及应用
Design method and application of filter material for tube well dewatering in highly permeable strata
摘要
Abstract
As an effective approach to avoid environmental problems caused by dewatering,the design of filter material for tube well dewatering in water-rich and highly permeable strata is critical to dewatering engineering in complex urban environment.Although theory of seepage has been well developed,a rational method for determining the particle size of filter materials has not yet been established.Based on soil filtration and pressure-reduction mechanisms of filter layers,this study proposed a design criterion of tube well dewatering filter material with effective interlayer coefficient Ec=2-3 and non-uniformity coefficient Cu≤2 as control indexes.Through discrete element numerical simulation,the particle loss characteristics and porosity variation of the formation-filter material system in the seepage process were analyzed.The microscopic mechanism of the filter material to achieve a self-stable state by intercepting fine particles was revealed.The results show that when the effective interlayer coefficient Ec≤3,the fine particle loss is less than the critical value of 3%,and the porosity stabilizes accordingly.The proposed design criterion was further validated through field pumping tests.This study provides a theoretical basis for the design of tube well dewatering filter material,which can improve the safety of foundation pit dewatering projects in water-rich and highly permeable strata.关键词
强渗透地层/管井降水/滤料设计/有效层间系数/离散元模拟Key words
highly permeable strata/tube well dewatering/design method of filter material/effective interlayer coefficient/discrete element method分类
天文与地球科学引用本文复制引用
李达,刘宁毅,赵耀威,焦雷,刘中欣,马建军..强渗透地层管井降水的滤料设计方法及应用[J].水文地质工程地质,2026,53(2):105-114,10.基金项目
国家重点研发计划项目(2020YFB1712105 （）
2019YFC0605104) （）
