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在颗粒流方法 PFC~(3D)的基础上发展了颗粒-流体耦合模型。在耦合模型中引入了孔隙度,其可考虑孔隙结构的可变性,并开发了可以考虑孔隙水压力和孔隙结构变化的颗粒-流体耦合计算程序。在此基础上模拟了饱和土的不排水剪切试验,与北京黏质粉土的试验数据及常体积模拟方法进行了对比。结果表明:采用颗粒-流体耦合方法计算得到的结果和常体积法计算结果与北京黏质粉土的试验结果相比均是一致的,验证了耦合算法的可靠性;分析比较了相同计算条件下耦合方法和常体积法计算得到的偏应力及径向应变曲线,研究了不同围压下试样的不排水剪切特性。颗粒-流体耦合计算结果表明:饱和土不排水剪切过程随着围压升高,孔隙水压力和偏应力均升高,而应力比曲线变得平滑,应力比有所降低。
Based on the particle flow method PFC ~ (3D), a particle-fluid coupling model was developed. Porosity is introduced into the coupled model to account for the variability of pore structure and a particle-fluid coupling calculation program that takes into account changes in pore water pressure and pore structure is developed. On this basis, the unconsolidated shear tests of saturated soils are simulated, and the experimental data and the normal volume simulation methods of Beijing clay are compared. The results show that the results obtained by using the particle-fluid coupling method and the results of the normal volume method are consistent with the experimental results of Beijing clay soil, and the reliability of the coupling algorithm is verified. The analysis and comparison under the same calculation conditions Coupled method and the normal volume method to calculate the deviatoric stress and radial strain curve, studied the undrained shear characteristics of specimens under different confining pressure. The results of particle-fluid coupling show that the undrained shear process of saturated soil increases with the increase of confining pressure and the pore water pressure and deviatoric stress increase, while the stress ratio curve becomes smooth and the stress ratio decreases.