Study on the law of influence by slurry viscosity on the fractured aquifer grouting and diffusion
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摘要: 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。Abstract: 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 the λmax=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.
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Key words:
- Fractured aquifer /
- grouting and diffusion /
- physical simulation /
- numerical simulation
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图 5 改造后裂隙岩体区域划分示意图
Figure 5. Schematic diagram of regional division of fractured rock mass after reconstruction
图 12 Lx23、Lx34、Lx45裂隙中应力分布
Figure 12. Stress distribution contour in fracture Lx23, Lx34, Lx45
图 14 未充填区域预制裂隙开度减小及闭合
Figure 14. Pre-fracture aperture reduction and closure in the unfilled area
表 1 实验参数
Table 1. Experimental parameter
实验编号 注浆实验参数 注浆浆液参数 实际注入体积/mL 注浆时间/min 水灰比 密度/(g·cm-3) 马氏黏度/s 有效黏度/cP 备注 A 2 356 9.7 1.8∶1 1.18 29.69 7.32 低黏度 B 2 420 10.0 1.5∶1 1.26 33.02 11.82 中黏度 C 2 590 11 1.2∶1 1.37 36.13 16.67 高黏度 
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表 2 浆液充填扩散结果
Table 2. Diffusion result parameter of cement filling
实验编号 扩散区域 完全充填区域 非完全充填区域 最远距离/cm 面积/cm2 总占比/% 最远距离/cm 面积/cm2 面积/cm2 最大长度Y/cm 占比/% A 74.8 3 139.8 52.33 50.8 2 114.6 1 025.2 24.0 32.65 B 65.2 3 033.6 50.56 51.1 2 325.4 708.2 14.1 23.35 C 80.8 3 704.4 61.74 60.6 2 910.5 793.9 20.3 21.43
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表 3 注浆前后超声波测缺陷结果
Table 3. Ultrasonic defect measurement results before and after grouting
试块编号 实验编号 注浆前波速v/(km·s-1) 注浆后波速v′/(km·s-1) 注浆前弹性模量Ed/GPa 注浆后弹性模量E′d/GPa 增强度λ/% B43-B53 A 3.21 3.55 14.38 23.45 63.07 B 3.21 3.61 14.38 24.25 68.63 C 3.21 4.01 14.38 29.92 108.07 B44-B54 A 3.07 3.59 17.54 23.98 36.75 B 3.07 3.66 17.54 24.93 42.13 C 3.07 3.87 17.54 27.87 58.91
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