The Pore Water Press of Granite Residual Soil With Different Consolidation Degree Under Cyclic Loading

The underlying soil sometimes has different consolidation degree. Cyclic loading will result in the change of pore water pressure as well as the differential settlement. In order to study the effect of the consolidation degree on pore water pressure, a series of dynamic cyclic tests of saturated soils were carried out by dynamic triaxial test system. This study investigated the influence of the different initial consolidation degree 80%, 90%, 100% and the confining stress on pore water pressure with the same cyclic stress ratio. As the number of cycles increases, the pore water pressure increases. Under the same consolidation degree and cyclic stress ratio, the peak pore water pressure increased with increasing the confining pressure. During cyclic loading, the peak pore water pressure in not fully consolidation soil is found to be higher than in fully consolidation soil for the same cyclic stress ratio, frequency and confining stress. In order to simulate the development of the pore water pressure under the cyclic loading, a hyperbolic model has been proposed. The model can simulate the whole process for pore water pressure development under different initial consolidation degree of the soil. The results indicate that the theoretical value agrees well with the measured data.