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粘性土中可能存在的初始水力坡度现象会影响其固结特性。通过GDS高级固结仪系统开展了不同塑性指数的粘性土和粉土在不同总固结压力和孔压条件时的孔压消散试验,研究结果表明:粘性土中存在初始水力坡度现象,土的塑性指数越高初始水力坡度也越大;孔压对初始水力坡度值有显著影响,孔压越小初始水力坡度越大;孔压相同时初始水力坡度随有效应力的增大无明显变化。
The initial hydraulic gradient that may exist in cohesive soil affects its consolidation characteristics. The pore pressure dissipation test of clay with different plasticity indices and silt under different total consolidation pressure and pore pressure conditions was carried out by GDS advanced consolidation instrument system. The results show that there is an initial hydraulic slope phenomenon in clay soil, The higher the plasticity index, the larger the initial hydraulic gradient. The pore pressure has a significant effect on the initial hydraulic gradient. The smaller the pore pressure, the larger the initial hydraulic gradient. The same initial hydraulic gradient does not change obviously with the increase of effective stress.