喷射钢纤维混凝土在鹤煤八矿深部软岩巷道支护中的应用

The Application of Steel Fiber Concrete in Support of Soft Rock Roadway at Depth in the No.8 Hebi Coal Mine

对钢纤维混凝土与素混凝土的整体力学特性进行了对比分析,研究了钢纤维的阻裂、增强、增韧机理。针对鹤煤八矿深部软岩巷道变形特点,分析了巷道变形破坏原因,提出通过素喷混凝土中掺入适量钢纤维的方法来改善混凝土的整体力学性能,使之更好地适应软岩巷道大变形的需要。借助数值模拟软件FLAC3D对支护方案进行了对比分析,并提出了合理的支护方案。该方案在鹤煤八矿3105岩中巷试验获得成功,取得了良好的技术经济效益。

The whole mechanical properties between steel fiber concrete and plain concrete are compared and analyzed,and the mechanism of the crack resistance,reinforcement,and toughing of steel fiber are studied.According to the deformation characteristics of the deep soft rock roadway in No.8 Hebi Coal Mine,the factors for roadway deformation is analyzed.The approach of improving the overall mechanical properties through incorporation of fiber in plain concrete is proposed,which can adapt with the large deformation of soft rock roadway.The numerical model with FLAC3D is employed to compare the support schemes and a reasonable support scheme is put forward.The support scheme is practiced successfully at the middle section of 3105 tunnel of Hebi No.8 coal mine with the excellent technical and economic results obtained.