摘要
基于分数布朗运动,采用随机中点位移法生成粗糙裂隙面,通过COMSOL软件建立岩体粗糙裂隙注浆数值模型,分析了浆液黏度及裂隙面粗糙度对浆液扩散的影响。结果表明:粗糙裂隙中浆液流场与光滑裂隙截然不同,浆液扩散速度在过流断面缩小区域,流速增大,过流断面增大区域,流速减小;裂隙粗糙度越大,低流速区域越大;裂隙面越粗糙,浆液压力越大,压力场非线性程度越强,相应的粗糙与光滑裂隙中浆液压力间的差值越大;浆液压力差随着浆液动力黏度的增加而增大,浆液黏度越大,裂隙粗糙度对浆液压力的影响越显著。
The random midpoint displacement method is used to generate rough fracture surface based on fractional Brownian motion. The numerical model of grouting in rough fracture of rock mass was established with COMSOL software. The influence of grouts viscosity and fracture roughness on grout diffusion is analyzed. The results show that the flow field of grout in rough fracture is different from that in smooth fracture. For the area of reduced flow section, the velocity increases. For the area of increased flow section, the velocity decreases. The greater the fracture roughness is, the larger the low velocity area is. The fracture surface gets more rougher, the larger the pressure,the more nonlinear the pressure field and the larger the difference between the corresponding rough and smooth grout pressures. The pressure difference increases with the increase of the viscosity of the grout. The greater the viscosity of the grout, the more significant the influence of the fracture roughness on the grout pressure.
作者
刘洋
覃祥瑞
张慧梅
张嘉凡
LIU Yang;QIN Xiangrui;ZHANG Huimei;ZHANG Jiafan(China Coal Technology and Engineering Group Xi'an Research Institute,Xi'an 710076,China;Department of Mechanics,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《煤炭技术》
CAS
北大核心
2022年第3期120-123,共4页
Coal Technology
基金
国家自然科学基金(41907259)
陕西省自然科学基金重点资助项目(2020JZ-53)。
关键词
围岩加固
注浆
分数布朗运动
粗糙裂隙
浆液黏度
扩散规律
surrounding rock reinforcement
grouting
fractional Brownian motion
rough fracture
grout viscosity
diffusion law
