An equivalent method for calculating the seepage coefficient of clay based on solidified micro-bound water #br#
ZHANG Yu1，CHEN Tielin1，WANG Zhifen2，ZHANG Yujun3
(1. Key Laboratory of Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China；2. The Fourth Engineering Division，Beijing Municipal Construction Co.，Ltd.，Beijing 100079，China；3. State Key Laboratory of Geomechanics and Geotechnical Engineering，Wuhan Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：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.
张 玉1，陈铁林1，王志芬2，张玉军3. 微观结合水“固化”黏性土渗流系数等效计算方法研究[J]. 岩石力学与工程学报, 2018, 37(4): 1004-1010.
ZHANG Yu1，CHEN Tielin1，WANG Zhifen2，ZHANG Yujun3. An equivalent method for calculating the seepage coefficient of clay based on solidified micro-bound water #br#. , 2018, 37(4): 1004-1010.
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2018, Vol. 37 
