矿山巷道矿压数值模拟推演及监测技术研究

为进一步掌握矿山窄矿柱沿空掘巷成巷技术,提高资源采出率。针对具体的生产地质条件,通过矿压监测、数值模拟等手段分析了窄矿柱巷道掘进、工作面推进和二次采动窄矿柱支承应力分布特征及影响。结果表明:1)巷道掘进期间,巷道前50 m压力较大,尤其是巷道两帮移近较为明显,两帮最大移近量约200 mm;2)巷道掘进阶段、采动影响时期,回风顺槽与上运输顺槽之间留设5 m矿柱,形成较大的应力集中,矿柱内最大垂直应力为21.38 MPa,工作面前后方矿壁内的垂直应力约为30 MPa,应力集中系数约为3,影响范围约为84 m,矿柱最大垂直应力为41 MPa;3)受二次采动影响,矿柱内的应力约为40 MPa,与一次采动相比变化不大,而应力峰值出现在工作面前方的三角区域,最大可达57.4 MPa,表明该区域是工作面回采期间的防治重点。矿压监测与数值模拟结果较为一致,进一步证明了研究结果的可靠性。

Study on ground pressure deduction and monitoring technology of roadway

In order to further master the tunneling technology of mining small coal pillars along the gob and improve the resource recovery rate. According to the specific production geological conditions, this paper analyzes the distribution characteristics and influence of small coal pillar support stress in small coal pillar roadway excavation, working face advance and secondary mining by means of ground pressure monitoring and numerical simulation. The results show that: (1) during roadway excavation, the pressure in the first 50 meters of the roadway is large, especially the two sides of the roadway move closer, and the maximum distance of the two sides is about 200 mm; (2) During the roadway excavation stage and the mining influence period, a 5m coal pillar is left between the return air chute and the upper transportation chute, forming a large stress concentration, and the maximum vertical stress in the coal pillar is 21.38 MPa; The vertical stress in the coal wall behind the front of the work is about 30 MPa, the stress concentration factor is about 3, the influence range is about 84 m, and the maximum vertical stress of the coal pillar is 41 MPa; (3) Affected by the secondary mining, the stress in the coal pillar is basically about 40 MPa, which changes little compared with the primary mining, while the peak stress appears in the triangle area in front of the working face, up to 57.4 MPa, indicating that this area is the focus of prevention and control during the mining of the working face. The results of ground pressure monitoring and numerical simulation are relatively consistent, which further proved the reliability of the research results.