摘要
针对传统注浆扩散模型的扩散机制未考虑裂隙开度、注浆压力等因素的问题,研究分析机械开挖岩体裂隙注浆扩散模型。基于流体力学理论计算岩体裂隙的等效水力开度,在定义裂隙注浆扩散模型基本假设条件的同时,构建由流核高度、岩体裂隙界面平均流速、裂隙注浆扩散运动方程组成的机械开挖岩体裂隙注浆扩散模型,并依据该模型推导裂隙注浆扩散区内的压力时空分布方程,利用该方程分析注浆压力、时间以及扩散距离等岩体裂隙注浆扩散特征。实验结果表明:岩体裂隙注浆时,扩散半径与裂隙开度、注浆压力以及水流速度呈正相关关系,与静水压力、裂隙注浆粘度呈负相关关系;该模型基本满足实际注浆压力与时空变化规律,可估算出灌注工程设计的合理参数,提升其工作效率。
Aiming at the problem that the diffusion mechanism of traditional grouting diffusion model does not consider the factors such as crack opening and grouting pressure,the grouting diffusion model of mechanically excavated rock mass is studied.Based on the hydrodynamics theory,the equivalent hydraulic opening of rock fracture is calculated.While defining the basic assumptions of the fracture grouting diffusion model,a mechanical excavation rock fracture grouting diffusion model composed of flow core height,average velocity of rock fracture interface and fracture grouting diffusion motion equation is constructed,and the pressure space-time distribution equation in the fracture grouting diffusion area is deduced according to the model,The equation is used to analyze the grouting diffusion characteristics of rock cracks,such as grouting pressure,time and diffusion distance.The experimental results show that,when rock fracture grouting,the diffusion radius is positively correlated with crack opening,grouting pressure and water flow velocity,and negatively correlated with hydrostatic pressure and crack grouting viscosity.The model basically meets the actual grouting pressure and temporal and spatial variation law,and the reasonable parameters of grouting engineering design can be estimated and its work is efficiency improved.
作者
詹志明
ZHAN Zhiming(Department of Tourism,Chizhou Vocational and Technical College,Chizhou AnHui 247000,China)
出处
《兰州工业学院学报》
2022年第2期46-51,共6页
Journal of Lanzhou Institute of Technology
基金
安徽省教育厅高校优秀青年骨干人才国内访问研修项目(gxgnfx2019130)。
关键词
机械开挖
岩体裂隙
注浆扩散模型
等效水力开度
压力时空分布
mechanical excavation
Rock fracture
crack grouting
grouting diffusion model
equivalent hydraulic opening
spatiotemporal distribution of pressure
