摘要
针对岩体劈裂注浆纵向起裂与扩散机制问题,考虑被注岩体的力学特性及地应力因素,分析浆液流变性的运动规律和裂缝的扩展形态,建立了考虑浆液流变性的纵向劈裂扩散模型,给出了纵向劈裂的起劈压力及劈裂通道扩展条件;推导了考虑裂缝几何形态及浆液流变性的纵向劈裂扩散运动方程并得到试验验证。研究表明,纵向劈裂注浆扩散时,除注浆压力与注浆速率因素外,其扩散范围亦受控于注浆段高度、被注岩体强度以及浆液流变性,三者与劈裂扩散半径均负相关,与注浆压力均正相关。岩体强度越高,液黏度越大,劈裂注浆所遇到阻力越高,裂缝扩展越加困难。研究结果可为今后基岩劈裂注浆设计提供理论参考。
To investigate the longitudinal initiation and diffusion mechanism of rock fracturing and grouting,the movement law of the rheological property of slurry and the form of the crack propagation are analyzed considering the mechanical properties of the injected rock mass and ground stress.In addition,the longitudinal fracturing diffusion model considering the rheological property of slurry is established,and the initial pressure of longitudinal fracturing and the expansion conditions of fracturing channel are given.Taking the fracture geometry and the rheological property of the slurry into account,the slurry diffusion equation is derived and verified by experiments.Studies have shown that,in addition to the factors such as grouting pressure and grouting rate,the diffusion range is also controlled by the height of the grouting section,the strength of the injected rock body,and the rheological property of the slurry during longitudinal fracture grouting.These influencing factors are all negatively correlated with the fracturing diffusion radius and positively correlated with the grouting pressure.The rock mass with high strength and the liquid with great viscosity can lead to high resistance encountered by the fracturing grouting,which can further result in difficult crack propagation.The research results can provide a theoretical reference for fracture grouting designs of the bedrock in the future.
作者
刘向阳
程桦
黎明镜
王雪松
张亮亮
周瑞鹤
LIU Xiang-yang;CHENG Hua;LI Ming-jing;WANG Xue-song;ZHANG Liang-liang;ZHOU Rui-he(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei,Anhui 230041,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China;School of Resource and Environmental Engineering,Anhui University,Hefei,Anhui 230031,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2021年第5期1373-1380,1394,共9页
Rock and Soil Mechanics
基金
国家自然科学基金项目(No.51874005)
国家重点研发计划资助项目(No.2016YFC0600902)。
关键词
岩体注浆
浆液黏度
纵向劈裂
扩散机制
rock grouting
grout viscosity
longitudinal fracturing
diffusion mechanism
