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Abstract The idea that the water film around soil particles should be brought into bearing surface area of effective stress is presented. Based on the mechanical calculation model bringing the water film into bearing surface area，the equation of extended effective stress principle is obtained. Combined with the physical meaning of permeability coefficient and substantial experimental data，the fitting equation between new physical parameters of channel rate and the permeability coefficient is established. According to Mohr-Coulomb criterion，the soil strength index under groundwater is obtained. Based on above，we obtained a unified algorithm for water and soil pressure，which realizes the transition between separate calculation and combined calculation of water and earth pressures. The unified algorithm makes water and earth pressures calculation more closely linked with basic physical and mechanical properties of soil，which has a significant meaning on the comprehensive and systematic study with clay soil mechanics problems.
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Received: 24 May 2013
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2014, Vol. 33 
