引水隧洞复杂裂隙围岩高压灌浆浆液扩散过程研究  

Study on high-pressure grouting fluid diffusion process in complex fractured surrounding rock of water diversion tunnel

作　　者：窦金熙 赵卫全[1,2,3] 路威 周建华[1,2,3] DOU Jinxi;ZHAO Weiquan;LU Wei;ZHOU Jianhua(China Institute of Water Resources and Hydropower Research,Beijing 100048,China;State Key Laboratory of Water Cycle Simulation and Regulation,Beijing 100044,China;Beijing IWHR Corporation,Beijing 100044,China)

机构地区：[1]中国水利水电科学研究院,北京100038 [2]流域水循环模拟与调控国家重点实验室,北京100038 [3]北京中水科工程集团有限公司,北京100048

出　　处：《中国水利水电科学研究院学报（中英文）》2023年第6期565-573,共9页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家重点研发计划项目(FZ2105-2021-28);广东省水利水电勘测设计研究院科研专项(WW2020466);中国水利水电科学研究院科研专项(EM0145B442019)。

摘　　要：随着我国抽水蓄能电站的大量兴建,超高水头引水隧洞逐渐增多,高压固结灌浆是保证隧洞围岩稳定的一种有效技术措施,其中灌浆参数的取值对于工程设计至关重要。本文利用COMSOL多物理场耦合软件平台,采用蒙特卡洛方法,结合MATLAB进行二次开发生成三维随机裂隙,基于浆液流变理论、流体连续性方程和对流扩散运动方程,以阳江抽水蓄能电站引水隧洞围岩高压灌浆为例,研究了不同水灰比、灌浆压力、灌浆时间对于三维网络裂隙岩体的浆液扩散过程的影响。模拟分析结果表明:水灰比对浆液扩散影响较大,浆液扩散距离和水灰比成正比;灌浆起始阶段水泥颗粒运移距离与灌浆历时呈正相关,但灌浆范围内的裂隙达到饱和后颗粒运移距离不再随时间延长而增加;在灌浆过程中需要逐步提高压力,以保证浆液充分渗透到裂隙内部,当灌浆压力超过一定数值,水泥颗粒运移量受灌浆压力影响较小。本研究可为同类型灌浆数值模拟开发和灌浆工程设计提供参考。With the extensive construction of pumped storage power stations in our country,the number of high-head water diversion tunnels has gradually increased.High-pressure cement grouting is an effective technical measure to ensure the stability of tunnel surrounding rocks,and the selection of grouting parameters is crucial for engineering design.In this study,the COMSOL multiphysics coupling software platform was utilized,and the Monte Carlo method was employed along with MATLAB for secondary development to generate three-dimensional random fractures.Based on the rheological theory of slurry,the fluid continuity equation,and the advection-diffusion equation,the impact of different water-cement ratios,grouting pressures,and grouting durations on the slurry diffusion process in a three-dimensional network of fractured rock mass was investigated,taking the high-pressure grouting of the Yangjiang pumped storage power station's water diversion tunnel as an example.The simulation analysis results indicate that the water-cement ratio has a significant influence on slurry diffusion,with the diffusion distance being directly proportional to the water-cement ratio.During the initial stage of grouting,the displacement of cement particles exhibits a positive correlation with the grouting duration.However,once the fractures within the grouting range reach saturation,the displacement of particles no longer increases with time.It is necessary to gradually increase the pressure during the grouting process to ensure the full penetration of slurry into the fractures.When the grouting pressure exceeds a certain value,the displacement of cement particles is less affected by the grouting pressure.This study provides a reference for numerical simulation development and grouting engineering design of similar nature.

关 键 词：抽水蓄能电站 隧洞围岩 复杂裂隙 超高压灌浆 浆液扩散模拟 

分 类 号：TV223.3[水利工程—水工结构工程]