深部巷道破碎围岩注浆加固效果综合评价

为了研究深部巷道破碎围岩注浆加固效果,以山西某矿2301巷道作为试验巷道,采用P-Q-t参数法、浆液填充率法、岩体力学参数法、分段注水法、钻孔电视法、物探法对破碎围岩注浆加固效果进行综合评价,并对锚杆、锚索预紧力进行测试和巷道变形进行监测。研究结果表明:P-Q-t参数法以定压与定量作为注浆结束依据,注浆压力达到预设压力,且注浆速度小于5 L/min的时间持续一定时间,则结束注浆。注浆后地层注浆填充率为93.2%,岩层整体性得到提高且孔隙率降低了39.35%,地层注水量明显减少,裂隙发育度降低;注浆后,钻孔裂隙被白色浆液填充,围岩完整性得到提高,条纹消失,地层成为连续的整体;锚杆、锚索,预紧力均达到150 kN,巷道变形量较小,满足了工作面回采的要求。

Comprehensive Evaluation for Grouting Effect of Fractured Surrounding Rock in Deep Roadway

In order to study on grouting effect of crushing surrounding rock, taking 2301 roadway of a coal mine in Shanxi as the experimental roadway, by using method of P-Q-t、grouting fill rates method, physical exploration method, method of inspection hole, borehole televiewer method, physical exploration method,grouting effect of crushing surrounding rock was evaluated. The results show that: (1) P-Q-t method is with constant pressure and quantitative as a basis for gouting end. When the speed is less than 5 L/min grouting last to a certain time, grouting pressure reaches the preset pressure, and the grouting is ended; (2) Grouting fill rates is 93.2%;(3) The integrity of floor strata is improved and the porosity is reduced by 93.3% after grouting; (4) The strata water injection rate decreases significantly and the degree of fracture decreases after grouting; (5) The fractures in borehole are filled by white grout and improved rock integrity after grouting; (6) The fringes disappeared and strata become a continuous whole after grouting; (7) The pre-tightening force of bolt and anchor cable are 150 kN and roadway deformation is relative less, which meets the mining need of face.