文献类型：期刊文献

中文题名：岩石裂隙内浆液–水两相流可视化试验与驱替规律研究

英文题名：Displacement laws of grout-water two-phase flow in a rough-walled rock fracture through visualization tests

作者：李博[1,2];王晔[1];邹良超[3];杨磊[4]

机构：[1]绍兴文理学院岩石力学与地质灾害浙江省重点实验室,浙江绍兴312000;[2]同济大学地下建筑与工程系,上海210092;[3]瑞典皇家理工学院可持续发展与环境工程系,斯德哥尔摩SE-10044,瑞典;[4]山东大学土建与水利学院,山东济南250100

年份：2022

卷号：44

期号：9

起止页码：1608

中文期刊名：岩土工程学报

外文期刊名：Chinese Journal of Geotechnical Engineering

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20224112866690)、Scopus、北大核心、CSCD、北大核心2020

基金：国家自然科学基金项目(42011530122,42077252);浙江省自然科学基金项目(LR19E090001)。

语种：中文

中文关键词：粗糙裂隙;注浆;两相流;PIV;驱替

外文关键词：rough-walled fracture;grouting;two-phase flow;PIV;displacement

中文摘要：富水裂隙岩体中的注浆是一个将浆液压入裂隙内空腔并驱替地下水的过程,开展浆液–水两相流驱替渗流规律研究对优化工程注浆方案具有重要意义。研发了基于粒子图像测速技术(PIV)的可视化驱替试验系统与方法,获取了3D打印的透明粗糙裂隙内的流场分布以及流速与压差的关系;基于有限元法求解Navier-Stokes偏微分方程组模拟驱替过程,与试验测试结果进行了对比验证。结果表明:在恒定流速条件下,注浆压力会随着时间的增加呈现先缓慢增大再加速增大,最终趋于一个定值的演变趋势;浆液首先沿优势渗流通道驱替水,在到达出口后压力增速减缓,随后在较长的时间内逐渐驱替残余水;残余水的分布主要集中在连通主要渗流通道边缘的盲端孔隙和开度大小发生突变的细小孔隙处,具有较低的流速;采用平行平板模型评价具有相同开度的粗糙裂隙中的注浆过程将低估注浆压力达45%。注浆压力是工程注浆中的一个关键控制参数,在理论计算中应充分考虑粗糙度的影响以确定合理的注浆压力,提升注浆效果。

外文摘要：The grouting in water-rich fractured rock masses is a process in which the pressurized grouts gradually displace the existing water. It is important to thoroughly investigate the grout-water displacement laws for improving the engineering grouting efficiency. In this study, a visualization technique that incorporates the particle image velocimetry(PIV) into the grout-water displacement tests is established, and is used to capture the flow field distribution in a 3D-printed transparent rough-walled fracture along with the flow velocity and hydraulic pressure measurements. The Navier-Stokes equations are solved based on the finite element method to simulate the displacement process, and the simulation is compared with the experimental observations. The results show that under the constant flow rate, the injection pressure first increases gently,followed by a rapid increase stage, and finally approaches a constant value. The grouts preferentially flow through some major channels, and the injection pressure tends to increase gently after the grout reaches the outlet. The residual water is mainly distributed in the dead end close to the edge of main flow channels and the locations where sudden changes in aperture happen.The parallel-plate model can underestimate the injection pressure by up to 45% comparing to the corresponding rough-walled model. It is therefore necessary to consider fracture roughness in the theoretical assessment of grouting pressures to achieve better grouting performance.