基于有效孔隙分布特征的黏土渗透系数公式推导  

Formula derivation of clay permeability coefficient based on effective pore distribution characteristics

作　　者：房营光[1] 徐亚飞 谷任国[1,2] 吴永康 FANG Yingguang;XU Yafei;GU Renguo;WU Yongkang(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Architectural Science,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《人民长江》2023年第1期227-232,共6页Yangtze River

基　　金：华南理工大学亚热带建筑科学国家重点实验室自主研究项目(2017kb16);国家自然科学基金项目(51208211)。

摘　　要：常用的渗透系数经验公式未能较好地考虑黏土的孔隙结构及矿物成分对土的渗透性影响,造成黏土渗透系数计算值与实测值具有较大的偏差,有必要对常用的渗透系数经验公式进行修正。首先考虑土的孤立孔隙、表面孔隙,并结合水层对黏土渗透性能的影响,定义对黏土渗流贡献最大的连通孔隙为有效孔隙,并给出针对黏土渗流的有效孔隙率计算方法,然后结合孔隙分布特征推导出渗透系数公式。选取广州市南沙区原状土及重塑土进行渗透试验对比,发现修正的渗透系数公式计算结果与实测值偏差较小,远优于传统斯托克斯孔隙流渗透系数公式计算结果。The commonly used empirical formula for permeability coefficient calculation fails to consider the influence of pore structure and mineral composition of clay on the permeability of soil,so the calculated value has a large deviation from the measured value.Therefore,it is necessary to correct the commonly used empirical formula of clay permeability coefficient.Firstly,considering the isolated pores and surface pores of soil as well as the influence of water layer on the permeability of clay,we define the connected pores with the greatest contribution to clay seepage as effective pores,and the calculation method of effective porosity for clay seepage is given.Then the permeability coefficient formula is derived combined with pore distribution characteristics.Comparing the permeability test of undisturbed soil and remolded soil in Nansha District of Guangzhou City,it is found that the deviation between the calculated results by the modified permeability coefficient formula and the measured values was small,which was much better than that by the traditional Stokes pore flow permeability coefficient formula.

关 键 词：渗透系数 经验公式 有效孔隙 黏土 

分 类 号：TU43[建筑科学—岩土工程]