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Abstract Through 7 clayey sand consolidation tests of suction and net mean stress both changing，the variation laws of 7 stress paths were studied in the p-s-v，p-s- ，p-s- and p-s-w spaces with the variation between suction and net mean stress included angle ?. Where p is net mean stress；s is suction；v is specific volume； is volume deformation； is volume deformation in water phase；w is moisture content；? is angle. The test results indicate that net mean stress is a very important factors to the volume deformation；the suction is the first conditions to the moisture changing. The yielding point locus is studied and given a unifying parabola expression in the p-s plane. Finally，using the predecessor test data forecasted yielding point locus laws in the p-s plane that proved the unifying parabola expression is credible.
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Received: 13 January 2011
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2011, Vol. 30 
