基于空芯包体原位应力测试的巷道差异性变形机制及控制技术研究

Research on Differential Deformation Mechanism and Control Technology of Roadway Based on In-situ Stress Test of Hollow Inclusion

为了研究不同方向巷道差异变形的地应力机制,采用空芯包体式应力解除法对彬长矿区北部雅店煤矿变形程度不同的巷道进行了地应力测量,结果显示地应力为σ_(H)>σ_(h)>σ_(V),地应力场以水平应力场为主,最大水平主应力方向为NEE-SWW,受控于华北区域构造应力场,此类型地应力场对巷道顶底板的稳定最为不利,南北巷道与东西巷道差异变形的主要因素为水平地应力不均衡和应力集中。中央大巷及井底车场区域最大主应力在12.30~15.41 MPa,属于中等应力区;ZC1101工作面回风顺槽区域最大主应力约为28.10 MPa,属于高应力区,后期回采期间该区域冲击地压影响将较其他区域更为严峻。南北向巷道变形趋于稳定时间为1~2个月,东西向巷道稳定时间5~10 d。实践表明,锚固注浆、U型钢棚喷浆联合支护、锚索+槽钢和锚杆+钢筋网的补强支护能有效地控制巷道变形。

In order to study the in-situ stress mechanism of different deformation of roadways in different directions, uses the hollow inclusion stress relief method to measure the in-situ stress of roadways with different deformation degrees in Yadian coal mine in the north of Binchang mining area.The results show that the in-situ stress is σ_(H)>σ_(h)>σ_(V), the in-situ stress field is mainly horizontal stress field, and the maximum horizontal principal stress direction is NEE-SWW is controlled by the tectonic stress field in north China, which is the most unfavorable to the stability of roadway roof and floor. The main factors of differential deformation between north-south roadway and east-west roadway are horizontal in-situ stress imbalance and stress concentration. The maximum principal stress of the central roadway and the bottom of shaft yard area is between 12.30 and 15.41 MPa, which belongs to the medium stress area;the maximum principal stress of the return air channel area of ZC1101 working face is about 28.10 MPa, which belongs to the high stress area, and the impact of rock burst in this area will be more severe than other areas during the later mining period. The deformation of North-South roadway tends to be stable in 1 to 2 months, and that of east-west roadway tends to be stable in5 to 10 days. The practice shows that the combined support of anchor grouting, U-shaped steel shed shotcreting, anchor cable + channel steel and anchor bolt +steel mesh can effectively control the roadway deformation.