Jining Jinqiao Coal Mine

为解决2303工作面梯形巷道回采期间围岩变形量大、难控制等问题,采用现场调研、理论计算及数值模拟得出了造成巷道围岩变形大的原因,并进行了支护参数优化。结果表明:通过理论计算得出煤柱宽度为10.8~12.4m,并通过数值模拟验证了12m宽度煤柱的合理性。将锚杆长度由2000mm增加至2400mm,锚索长度由5400mm增加至8000mm。现场采用该优化方案后,监测点1、监测点2巷道顶板下沉量及两帮收敛量分别达到36mm、49mm、34mm、47mm,有效控制了巷道围岩变形。

In order to solve the problems of large deformation amount of surrounding rock, difficult to control and others during the stoping period of the trapezoidal roadway in the 2303 working face, the reasons for the large deformation of roadway surrounding rock are obtained through on-site investigation, theoretical calculation, and numerical simulation, and the support parameters are conducted to be optimized. The results show that the width of the coal pillar is obtained to be 10.8-12.4 m through theoretical calculation, and the rationality of the 12 m width coal pillar is verified through numerical simulation. Increase the length of the anchor rod from 2000 mm to 2400 mm and increase the length of the anchor cable from 5400 mm to 8000 mm. After adopting this optimization scheme on site, the roof subsidence amount and the two sides convergence amount of monitoring point 1 and monitoring point 2 reaches 36 mm, 49 mm, 34 mm, and 47 mm, respectively, effectively controlling the deformation of the roadway surrounding rock.