巷道复合结构破坏机理及锚注支护控制技术研究

Study on Failure Mechanism of Composite Structure of Roadway and Control Technology of Bolt-grouting Support

以宏岩煤矿轨道下山顶板离层破坏控制为工程背景,采用材料力学理论计算和数值分析的方法,对巷道复合顶板破坏机理进行分析研究。分析结果表明,由于巷道顶板岩层的复合结构,在覆岩载荷和相邻工作面的采动影响下,致使巷道出现顶板下沉严重及支护体失效等矿压现象。提出利用注浆加固在顶板形成的多介质结构与注浆锚杆锚索联合控制顶板结构稳定性技术,根据轨道下山围岩结构确定深浅孔锚注加固方案并实施现场工程对比试验,加固区域顶板最大下沉量控制在59 mm左右,对顶板的复合结构取得了良好的控制效果。

Based on the engineering background of control of roof separation failure under track in Hongyan Coal Mine,the failure mechanism of compound roof was studied by means of material mechanics theory calculation and numerical analysis.The analysis results show that,due to the compound structure of the roadway roof,under the influence of overburden load and mining of the adjacent working face,the roof subsidence of roadway is serious and the supporting body fails.By combining the multi-medium structure formed by grouting reinforcement and grouting bolt anchor cable,the technology of controlling the stability of roof structure is put forward.The scheme of deep and shallow borehole anchor grouting reinforcement is determined according to the surrounding rock structure of track downhill,and field engineering contrast test is carried out,the maximum roof subsidence in the reinforced area should be controlled at about 59 mm,the composite structure of the roof obtains good control effect.