微观结合水“固化”黏性土渗流系数等效计算方法研究  

An equivalent method for calculating the seepage coefficient of clay based on solidified micro-bound water

作　　者：张玉[1] 陈铁林[1] 王志芬 张玉军[3] ZHANG Yu;CHEN Tielin;WANG Zhifen;ZHANG Yujun(Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;The Fourth Engineering Division, Beijing Municipal Construction Co., Ltd., Beijing 100079, China;State Key Laboratory of Geomechanics and Geotechnical Engineering, Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei430071, China)

机构地区：[1]北京交通大学城市地下工程教育部重点实验室,北京100044 [2]北京市政建设集团有限责任公司第四工程处,北京100079 [3]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩石力学与工程学报》2018年第4期1004-1010,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(C16JB00110);国家重点研发计划重点专项项目(2017YFC0805406)~~

摘　　要：针对黏性土渗流系数较难准确测定和既有经验计算方法参数获取困难、误差较大等问题,基于较为成熟的粗粒土渗流系数经验计算方法,进一步寻求较为简单准确的途径。首先总结黏性土和粗粒土渗流系数经验计算方法;然后针对黏性土,定义无效孔隙和有效孔隙,按照微观结合水"固化"的等效原则将黏性土等效成粗粒土,并引入参数"等效孔隙比",得出黏性土渗流系数等效计算方法;最后,阐释液塑限综合法测定无效孔隙体积的原理,并通过三组算例评价黏性土渗流系数等效计算方法的准确性。结果表明:(1)计算方法中引入"等效孔隙比"实现了黏性土和粗粒土渗流系数计算的统一;(2)土体微观结合水含量的最大值约为液限的0.9倍;(3)黏性土Mesri方程,以及粗粒土太沙基、柯森–卡门渗流系数等效的计算方法所得结果和实测值最为接近,适用于黏性土渗流系数的计算。It＇s hard to correctly determine the seepage coefficient of clay by experiment,and the existing empirical methods are difficult in parameter acquisition and poor in calculation accuracy. On the other hand, the empirical methods to derive the seepage coefficient of coarse-grained soil are mature. Therefore,the empirical methods of clay and coarse-grained soil were summarized and listed firstly. The ineffective and effective pores were defined for clay,putting it equivalent to the coarse-grained soil according to micro-bound water solidification. The parameter of equivalent void ratio was introduced to establish the equivalent method of calculation. The liquid-plastic limit method to determine the volume of ineffective pore was explained,and the feasibility of equivalent calculation method was also evaluated in three examples. The results show that the introduction of the equivalent void ratio unifies the calculation of the seepage coefficient for clay and coarse-grained soil. The maximum micro-bound water content is about 0.9 time the size of liquid limit. The seepage coefficients from Mesri Equation of clay and the method of Terzaghi or Curson-Karman after the application of equivalent method are in agreement with the experimental values.

关 键 词：土力学 黏性土 渗流系数 结合水 无效孔隙 等效孔隙比 

分 类 号：TU43[建筑科学—岩土工程]