土木工程与管理学报2017，Vol.34Issue(4)：30-38,9.
砂土注浆的颗粒流细观力学数值模拟
Micromechanics Particle Flow Numerical Simulation on Sandy Soil Grouting
摘要
Abstract
As the strong invisibility of grouting, diffusion mechanisms is still immature.PFC2D simulation test technology, which based on meso-mechanics, could study the displacement, deformation of the particles and its coupling with the slurry,opening up a new route for grouting mechanism research.Based on the principle of fluid-structure coupling numerical simulation program, PFC2D particles flow, which uses its built-in FISHTANK function library and FISH language, and the flow equation and pressure equation of fluid domain have been defined, and the process of grouting slurry diffusion in the formation and shape are simulated and calculated.By adjusting the parameter of step and perm in PFC's command stream, grouting effects in different penetration gravels were obtained.Numerical simulation indicates that action modes between serous fluid and ground soil are mutually affected by the grouting pressure, and ideal splitting injection effects could be obtained as the grouting pressure increase, while foundation structure will be destroyed as the pressure increase excessively.Stressed states around the drilling hole have been analyzed.Split seams around the drilling hole occur as the circumferential tension increase, and penetration modes of the slurry transits to splitting modes.Its results comply with the simulation.When split grouting method occurs,porosity and strain increase.Thin slurry with superior flowing property is fit for penetration grouting, while thick slurry with inferior flowing property is fit for compaction grouting and split grouting.Conductivity of the slurry affects the grouting little in high-pressure grouting.关键词
砂砾石土/注浆/颗粒流/数值模拟/注浆压力/注浆时间/渗透性质Key words
sandy soil/grouting/particle flow/numerical simulation/grouting pressure/grout time/penetration分类
建筑与水利引用本文复制引用
秦鹏飞..砂土注浆的颗粒流细观力学数值模拟[J].土木工程与管理学报,2017,34(4):30-38,9.基金项目
郑州工业应用技术学院博士科研启动基金(201602001) （201602001）
