破碎围岩锚注加固浆液扩散规律研究  

Slurry diffusion within cracked wall rock during the bolt-grouting process

作　　者：李慎举[1,2] 王连国[3] 陆银龙[3] 张蓓[1] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]霍州煤电集团公司,山西霍州031400 [3]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《中国矿业大学学报》2011年第6期874-880,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50874103);国家重点基础研究发展计划(973)项目(2010CB226805)

摘　　要：基于连续介质力学和渗流力学理论,运用渗透张量法得出浆液在破碎围岩中扩散的基本方程;并通过对实际锚注支护工程进行假设与简化,建立锚注加固系统浆液在包含正交裂隙组的围岩中渗透扩散的数学模型.在此基础上,运用COMSOL软件对锚注支护工程进行实时模拟,研究了不同注浆压力和不同注浆锚杆布置方式对浆液流动扩散规律的影响.结果表明:对于巷道锚注支护工程,合理的注浆压力约为1.0～4.0MPa,合理的钻孔间距约为浆液扩散半径的1.3倍左右.将研究成果用于祁南煤矿新掘大巷锚注支护设计,取得了良好的效果.Continuum mechanics were used with seepage theory to obtain a basic equation for slurry diffusion within cracked wall rock.The permeability tensor method was used to obtain the diffusion behavior.A mathematical model of slurry diffusion in a bolt grouting system within a wall rock having orthogonal fractures was developed.Certain assumptions and simplifications of field grouting and support methods were used during this derivation.A numerical simulation of the bolt grouting process was conducted using COMSOL.The slurry diffusion at different grouting pressures and for different bolt layouts were studied.The results show that a rational grouting pressure is from 1.0 to 4.0 MPa for roadway bolt supports.The borehole spacing should be nearly 1.3 times the slurry diffusion radius.These results were applied to the design of roadway supports in the Qinan coal of the Huaibei mine to good effect.

关 键 词：锚注支护 注浆时间 注浆压力 浆液 渗透 扩散 

分 类 号：TD31[矿业工程—矿井建设]