黏度对浆液在裂隙岩体中扩散与充填规律的影响

Study on the law of influence by slurry viscosity on the fractured aquifer grouting and diffusion

为研究浆液黏度对注浆加固过程中浆液在裂隙中扩散、充填规律的影响,基于新研发的实验系统模拟了三种黏度浆液在承压含水层裂隙中扩散过程,总结了浆液扩散及充填规律;采用Fluent对注浆过程进行仿真,得到了不同黏度浆液充填过程中应力分布及变化规律,解释了物理实验过程中出现的异常现象,并通过超声波探测得出不同黏度浆液改造后的岩体弹性模量变化规律。结果表明:高黏度浆液注浆过程中形成的区域高应力驱动裂隙不规则发育,浆液扩散向右侧偏转;相同应力下岩块弹性模量增强度(λ)与浆液黏度(μe)成正比,实验中λmax=108.07%(μe=16.67);中等黏度浆液改造效果最好,非完全充填区域面积占比23.35%,未出现浆液堆积等异常现象。

This study is to investigate the influence of slurry viscosity on the diffusion and filling of slurry during grouting reinforcement.Firstly,based on the newly developed test device,the diffusion process of three kinds of viscosity slurry in the aquifer of confined aquifer was simulated,and the law of slurry diffusion and filling was summarized.Fluent was adopted to simulate the grouting process.The stress distribution and variation law during the filling process of different viscosity slurries was obtained,the abnormal phenomena appearing in the physical test process was explained,and the elastic modulus of the rock mass after different viscosity slurry transformation by ultrasonic measurement was obtained.The results show that:In the process of high-viscosity slurrygouting,the formation of high-stressed cracks in the region is irregularly developed,and the slurry diffusion is deflected to the right;Under the same stress,the elastic modulus(λ)of the rock block is proportional to the viscosity of the slurry(μe),and theλmax=108.07%(μe=16.67)in the experiment;The medium viscosity slurry has a good transformation effect,and the area of the non-complete filling area is 23.35%,and no abnormal phenomenon such as slurry accumulation occurs.