岩土力学2024，Vol.45Issue(8)：2492-2501,2514,11.DOI:10.16285/j.rsm.2023.1461
基于CFD-DEM方法的饱和砂土场地液化模拟研究
Simulation of saturated sand site liquefaction based on the CFD-DEM method
摘要
Abstract
Soil liquefaction is a prevalent seismic hazard.However,current indoor and model experiments studying the dynamic characteristics of sand liquefaction struggle to accurately represent the actual soil liquefaction process.The computational fluid dynamics(CFD)coupled with discrete element method(DEM)simulation method can accurately simulate various soil-water coupling problems.The CFD-DEM flow-solid coupling module facilitated the exchange of mechanical information between the commercial discrete element software PFC3D and the open-source computational fluid dynamics software OpenFOAM.The feasibility of this approach was confirmed through particle underwater free settling experiments.Calibration of numerical sand specimens with dynamic characteristics of real saturated sand was conducted using PFC3D software through simulated indoor cyclic triaxial tests.Based on the existing parameter information and the coupled simulation method,a site liquefaction model of saturated sand was established.The simulation results indicate that the discrete element method(DEM)can replicate indoor sand liquefaction experiments,and the calibrated parameters can be applied to site liquefaction simulations.The consistency between the settling velocity of individual particles and theoretical solutions validates the accuracy of the CFD-DEM coupling method.Under a peak acceleration of 0.25g,liquefaction occurs at various depths,and the ratio of excess pore pressure does not exceed 1 during liquefaction.The cumulative excess pore pressure increases from shallow layers to deep layers.After liquefaction,the soil strength gradually recovers from bottom to top,and the soil structure in the re-consolidated site shows a trend of homogenization.关键词
砂土液化/CFD-DEM耦合方法/颗粒自由沉降/场地液化模拟Key words
soil liquefaction/CFD-DEM coupling method/particle free settling/site liquefaction simulation分类
土木建筑引用本文复制引用
许文昊,王志华,申志福,高洪梅,刘殷强,张鑫磊..基于CFD-DEM方法的饱和砂土场地液化模拟研究[J].岩土力学,2024,45(8):2492-2501,2514,11.基金项目
国家自然科学基金面上项目(No.51678300,No.52178336,No.52108324) （No.51678300,No.52178336,No.52108324）
江苏省高等学校自然科学研究重大项目(No.18KJA560002) （No.18KJA560002）
江苏省高校"青蓝工程"中青年学术带头人 （）
江苏省研究生科研与实践创新计划项目(No.KYCX22_1354).This work was supported by the General Program of National Natural Science Foundation of China(51678300,52178336,52108324),the Major Research Project in Natural Sciences for Higher Education Institutions of Jiangsu Province(18KJA560002),the Young Academic Leader in the"Qinglan Project"of Universities in Jiangsu Province and the Jiangsu Provincial Graduate Research and Practice Innovation Program(KYCX22_1354). （No.KYCX22_1354）
