基于非达西渗流的砂井地基固结解

Analytical Solution for Consolidation of Sand Drains Foundation Based on Non-Darcy Seepage

摘要:

采用考虑起始水力梯度的非达西渗流模型，修正了砂井地基固结理论。建立了相应的控制方程，并对其求解，给出了便于应用的显式解答，在此基础上研究了考虑起始水力梯度时砂井地基的固结性状。结果表明，由于起始水力梯度的存在，应力固结度最终将稳定在一个小于100%的数值上，最终的固结度随着起始水力梯度增大而减小。初始孔压也会对固结性状产生影响，初始孔压越大孔压消散越充分，最终达到的应力固结度越大。但是初始孔压增大到一定值之后，最终固结度对其的灵敏度降低。

Abstract:

Sand drains foundation consolidation theory is modified based on the non-Darcy seepage model which considering the initial hydraulic gradient. The control equations are derived and then explicit solutions are obtained. The consolidation behavior of sand drains foundation considering initial hydraulic gradient has been researched. The results show that because of the existence of initial hydraulic gradient, the consolidation degree of stress finally reached a value less than 100%, and the final degree of consolidation decreases with the increase of initial hydraulic gradient. Meanwhile, the initial pore water pressure also influences the consolidation characters, higher initial pore water pressure lead to faster dissipating of pore water pressure and consequently higher degree of consolidation.However, the sensitivity of consolidation degree with initial pore water pressure will reduced as the initial pore water pressure increases to a certain value.