摘要
脉动注浆虽已在注浆防渗加固工程中得到推广应用,但浆液在脉动压力下的渗透扩散机制却鲜有报道,导致理论远滞后于工程实践。以宾汉流体流变方程、渗流方程及颗粒沉积理论为基础,推导了脉动压力下宾汉流体的渗透扩散理论计算公式,分析了脉动注浆参数对浆液扩散距离的影响,并通过室内注浆模拟试验对其进行了验证。结果表明,脉动压力下宾汉流体渗透注浆扩散理论计算值与试验实测值间存在一定误差,但能满足工程要求,可用于指导工程施工。随着脉动注浆连续时间的增长或地层初始孔隙率的增大,浆液扩散距离随之增大,而随着脉动注浆间隔时间的增长或地层初始孔隙率的减小,浆液扩散距离随之减小,实际注浆工程中为确保有效的浆液扩散距离,宜根据岩土体孔隙率合理地调节脉动连续时间和脉动间隔时间。研究成果可为脉动注浆理论研究提供借鉴,为实际施工提供理论指导。
Pulsating grouting has been widely used in seepage prevention and reinforcement grouting and engineering, but the mechanism of infiltration grouting is not clear, which impairs theory development and current theory could not guide engineering practice. Based on the Bingham fluid rheological equation, the seepage equation, and the particle deposition theory, the infiltration grouting theory of Bingham fluid under pulsating pressure is deduced. Also, the effect of pulsating grouting parameters on slurry diffusion range is analyzed, and it is verified by the self-made indoor experimental device. The results show that there is an error between the calculated value based on the theory and the value measured in the test, but it can meet engineering requirements and can be used to guide project construction. The slurry diffusion range increases with the increase of grouting time and the initial porosity of the formation, and the slurry diffusion range decreases with the increase of grouting interval time and the decrease of the initial porosity of the formation. Therefore, it is necessary to adjust pulsation grouting parameters according to initial porosity of the formation to ensure the effective slurry diffusion range in grouting engineering. The research results can provide references for the study of theory and guidance for practical construction.
作者
张聪
梁经纬
张箭
阳军生
张贵金
叶新田
ZHANG Cong;LIANG Jing-wei;ZHANG Jian;YANG Jun-sheng;ZHANG Gui-jin;YE Xin-tian(School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;Hunan Water Resources and Hydropower Research Institute,Changsha,Hunan 410007,China;College of Civil and Transportation Engineering,Hohai University,Nanjing,Jiangsu 210098,China;School of Hydraulic Engineering,Changsha University of Science and Technology,Changsha,Hunan 410114,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2018年第8期2740-2746,2754,共8页
Rock and Soil Mechanics
基金
国家自然科学基金项目(No.51279019)
中南大学中央高校基本科研业务费专项资金资助项目(No.2016zzts075)~~
关键词
脉动注浆
宾汉流体
渗透扩散
室内试验
pulse grouting
Bingham fluid
penetration diffusion
laboratory test
