基于PFC^(3D)的无黏性土渗流临界水力梯度模拟分析

Simulation of Critical Hydraulic Gradient in No Cohesive Soil with PFC^(3D)

为了实现渗流作用下无黏性土临界水力梯度的计算,应用PFC3D中的渗流模型,对渗流实验算例进行了数值计算模拟,计算结果与实验结果基本吻合,说明该模型用来模拟渗流问题是正确和有效的.对不同颗粒摩擦系数下的无黏性颗粒模型进行了渗流破坏的数值模拟.结果表明:无黏性土的渗流临界水力梯度随着颗粒摩擦系数增加而增大;计算结果与使用经验公式计算所得到的结果基本一致,表明了对渗流临界水力梯度模拟计算的正确有效性.而相较经验公式,应用PFC3D进行渗流数值计算适用于更为复杂的工程和地质条件,因而具有更强的适用性,可为复杂条件下的渗透稳定计算提供可靠的参考和依据.

In order to calculate the critical hydraulic gradient of no cohesive soil during water seepage,numerical simulation on seepage experiments was conducted with PFC3 D.The numerical results agree well with the seepage experiments,thus verifying the effectiveness of PFC3 D model.Then,the damage during seepage of no cohesive soils with different particle friction coefficient was numerically simulated.The results showed that critical hydraulic gradient of no cohesive soil during water seepage increases with the raising of particle friction coefficient.The PFC3 D results agree well with the empirical results,and the effectiveness of calculation in seepage critical hydraulic gradient is validated.Compared to empirical formula,PFC3 D can be available for analyzing the seepage under complex engineering and geological conditions.It can provide a scientific reference and basis for seepage calculation under complex conditions.