深井复杂条件下煤巷快速掘进支护参数调整可行性研究与应用

Feasibility Study and Application of Parameter Adjustment for Rapid Excavation Support Under Complex Conditions of Deep Coal Roadways

为实现煤巷快速掘进,探究支护参数调整可行性问题,以顾桥矿1211工作面运输顺槽为研究对象,采用FLAC3D数值模拟和现场验证等方法,分析了煤巷开掘后各种支护密度条件下巷道围岩的受力与变形破坏特征。结果表明:煤巷在原有支护方案(方案5)条件下支护效果最好,巷道支护密度最为适宜;通过数值模拟得出支护优化后方案(方案3),顶底板垂直应力峰值为4.1 MPa,最大顶底板位移量平均值为36.25 mm,塑性区发育高度为2.2 m,支护效果与原支护方案相近,验证了该方案的理论可行性;现场采用方案3支护后支护效果较好,巷道整体稳定,巷道变形量较小,且取得了良好的经济效益。

In order to achieve rapid excavation of coal roadways and explore the feasibility of support parameters adjustment,the transportation roadway of the 1211 working face in Guqiao Mine was taken as the research object.FLAC3D numerical simulation and on-site verification methods were used to analyze the stress and deformation failure characteristics of the roadway surrounding rock under various support density conditions after excavation of the coal roadway.The results indicate that the coal roadway has the best support effect under the original support scheme(scheme 5),presenting the most suitable support density for the roadway.Through numerical simulation,it is found that the optimized support scheme(scheme 3)can achieve a peak vertical stress of 4.1MPa,an average maximum displacement of 36.25mm of the roof and floor,and a plastic zone height of 2.2 m.The support effect of scheme 3is similar to the original support scheme,verifying the theoretical feasibility of the scheme.Implementation of support scheme 3on site has favorable outcomes,with overall stability and small deformation of the roadway,which achieved notable economic benefits.