大型地下输水管涵运行期地表渗水数值模拟分析

Numerical simulation analysis of surface water seepage during operation of large underground water conveyance culvert

摘要

城市大型地下输水管涵运行期，地表渗水问题引起各方关注。以某城市大型地下输水管涵地面渗水为背景，针对工程地质和水文地质条件，进行地表渗水数值模拟分析研究。选取典型断面，通过设置衬砌不同的渗透系数来反映管涵的不同渗漏程度，进而分析对地表渗水的影响。结果表明：衬砌的渗漏越严重，衬砌孔压消散越小，衬砌顶部土体孔压增加越明显，地表孔压随之增大；在衬砌渗透系数达到1 m/d,长期渗流作用下地表有点状水出漏；对比现场地下水监测资料，与模拟值比较接近。研究成果对于类似城市大型地下输水管涵设计与运行具有借鉴和参考价值。

Abstract

The surface seepage problem has attracted attention during the operation period of Urban large underground water conveyance culvert. Taking the surface seepage of a large urban underground water conveyance culvert as the background, the numerical simulation analysis of surface seepage is carried out according to the engineering geological and hydrogeological conditions. Typical sections are selected to reflect the different leakage degrees of the culvert by setting different permeability coefficients of the lining, and then the influence on surface water seepage is analyzed. The result show that the more serious the leakage of the lining, the smaller the dissipation of the pore pressure of the lining, the more obvious the increase of the pore pressure of the soil at the top of the lining, and the increase of the surface pore pressure. When the permeability coefficient of the lining reaches 1 m/d, the surface water is exposed under long-term seepage. Compared with the field groundwater monitoring data, it is close to the simulation value. The research result have reference value for the design and operation of similar urban large underground water conveyance culvert.

关键词

地下 / 输水 / 管涵 / 地表渗水 / 数值模拟

Key words

underground / water conveyance / pipe culvert / surface water seepage / numerical analysis

Author summay

袁鸿鹄(1984—), 男, 正高级工程师, 书记、副院长, 博士, 主要从事水利工程勘察设计和科研工作。E-mail: [e-mail]

基金资助

北京市水务五个一人才培养计划项目