摘要
为了解决深部高地应力巷道普遍存在的变形严重、支护困难等问题,对深部高应力巷道围岩变形破坏特征及其影响因素进行了分析,探讨了高强锚注支护作用机理,并对组合锚索注浆支护技术及配套施工工艺进行了研究,设计了组合锚索高压注浆技术方案及工艺参数,并研制了新型组合锚索注浆封孔装置。研究结果表明:组合锚索注浆分为封口注浆和封孔注浆2部分,一次注浆后孔口被固化,承受注浆压力明显增强,由原来的3 MPa增大到8 MPa,注浆压力提高后浆液扩散半径明显增大,浆液沿着岩层的裂隙扩散,增加了破碎岩层的黏聚力和围岩整体强度,在巷道周围形成了稳定的承压组合拱,提高了巷道的稳定性;通过对比分析,组合锚索注浆支护段的巷道围岩控制效果明显好于普通支护段,通过组合锚索注浆的应用,大幅增强了巷道围岩支护强度,巷道围岩变形较普通支护段减小50%以上,较好控制了巷道围岩变形。
In order to solve the problems commonly existed in deep roadway with serious deformation,and difficult support of surrounding rock,etc.,the deformation and failure characteristics of deep high stress roadway surrounding rock and its influencing factors were analyzed,and the mechanism of high strength bolting support was discussed,the combined anchor cable grouting support technology and supporting construction technology were studied,the combined anchor cable high-pressure grouting technology scheme and process parameters were designed,and a new type of combined anchor cable grouting sealing device was designed.The results show that:the grouting of the combined anchor cable can be divided into two parts:sealing grouting and hole sealing grouting.After the first grouting,the orifice is solidified and the grouting pressure is significantly increased from 3 MPa to 8 MPa.After the grout pressure is increased,the grout diffusion radius is obviously increased,the grout spreads along the cracks of the rock layer,which increases the cohesion of the fractured rock strata,and improves the overall strength of surrounding rocks,and forms a stable pressurized composite arch around the roadway,which will improve the stability of the roadway.Through comparison and analysis,the control effect of the roadway surrounding rock in the combined anchor cable grouting support section is significantly better than that of the ordinary support section.The supporting strength of surrounding rock of roadway is greatly strengthened,and the integrity of surrounding rock is improved,the surrounding rock of roadway deformation is reduced by more than 50%compared with the ordinary support section,and the surrounding rock deformation is better controlled.
作者
孙海良
赵静雅
孙家悦
SUN Hailiang;ZHAO Jingya;SUN jiayue(Driving office,Pingdingshan Tian’an Coal Industry Co.,Ltd.,Pingdingshan 467000,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第12期68-73,共6页
Coal Science and Technology
关键词
高地应力
封孔装置
组合锚索
高压注浆
high ground stress
sealing device
combined anchor
high-pressure grouting
作者简介
孙海良(1965-),男,河南济源人,高级工程师。E-mail:469512163@qq.com。
