长江漫滩区软土渗透系数计算方法对比分析  

Comparative Analysis of Calculation Methods for Permeability Coefficient of Soft Soil in the Yangtze River Floodplain Area

作　　者：张杰 黄勇[1] ZHANG Jie;HUANG Yong(School of Earth Science and Engineering,Hohai University,Nanjing,Jiangsu 211100)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100

出　　处：《中国煤炭地质》2024年第2期37-42,共6页Coal Geology of China

基　　金：长江水科学研究联合基金(U2240217)。

摘　　要：软土(弱透水层)是地下水系统的重要组成部分,主要由黏土、亚黏土及粉质黏土等渗透系数较小的土体组成,其渗透系数在实际工程渗流计算中具有重要意义。以长江软土地区海太过江通道工程南岸弱透水层为研究对象,采用经验公式法(室内土工颗分试验)、微水试验配线法以及数值模拟反演法,对于弱透水层的渗透系数进行计算,所得结果分别为7.196×10^(-5)、1.50×10^(-5)、8.10×10^(-5)cm/s;多方法相互验证,降低了单一方法影响范围小、取样存在偶然性等因素的影响。根据工程最不利原则,研究区弱透水层渗透系数建议取值为8.1×10^(-5)cm/s。Soft soil(Aquitard)is an important component of groundwater systems,mainly composed of soils with lower permeability coefficients such as clay,sub clay,and silty clay.Its permeability coefficient is of great significance in practical engineering seepage calculation.The study focuses on the weak permeable layer on the south bank of the Haitai River Passage Project in the soft soil area of the Yangtze River.The empirical formula method(indoor geotechnical particle size test),micro water test wiring method,and numerical simulation inversion method are used to calculate the permeability coefficient of the weak permeable layer.The results obtained are:7.196×10^(-5),1.50×10^(-5) and 8.10×10^(-5)cm/s;Multi method mutual verification reduces the impact of factors such as small scope of influence and sampling randomness of a single method.According to the most unfavorable principle of engineering,the recommended permeability coefficient of the aquitard in the research area is 8.1×10^(-5)cm/s.

关 键 词：水文地质参数计算 渗透系数 经验公式法 微水试验 数值反演 软土地区 

分 类 号：P641[天文地球—地质矿产勘探]