深部软弱破碎复合顶板煤巷稳定控制技术

针对深部软弱破碎复合顶板矩形断面煤巷易冒顶、大变形、难支护等特点,基于锚杆和锚索支护理论,提出了兼具组合梁和组合拱承载效应的梁-拱锚固承载结构,分析了梁-拱锚固结构的几何特征,揭示了不同锚固参数条件下梁-拱锚固结构的形成过程及演化规律,反映了不同支护形式下煤巷顶板的锚固结构效应。采用FLAC~(3D)模拟研究了4种支护技术方案条件下深部软弱破碎复合顶板煤巷围岩位移与塑性区损伤扩展演化规律,揭示了不同支护技术方案对矩形断面煤巷围岩的控制效果,验证了采用基于梁-拱锚固结构的深部软弱破碎复合顶板矩形断面煤巷支护技术方案的合理性,并进行了井下工业性试验。监测结果表明,采用"梁-拱锚固结构"支护技术方案有效地控制了深部软弱破碎复合顶板煤巷离层与大变形,维持了深部软弱破碎复合顶板煤巷围岩与支护结构的稳定及安全。

Stability control technology for deep soft and broken composite roof in coal roadway

In terms of the roof fall,large deformation and difficult support of deep soft broken composite roof in rectangular section coal roadway,based on the support theory of bolting and rope,this study put forward the beam arch bearing structure which had the feature of composite beams and composite arch.The geometrical charac teristics of the anchorage of beam arch structure was analyzed,it revealed the formation process and evolution law of the beam arch anchorage structure with different anchorage parameters and reflected the anchorage structure effects for different supporting programs.Four kinds of supporting technology solutions were studied by FLAC3D to simulate the surrounding rock displacement of deep soft broken composite roof and the damage extension evolution of plastic zone.It reveals the control effect of different supporting technology solutions in rectangular cross section coal roadway.The rationality of supporting technology scheme based on beam arch structure in deep soft broken composite roof was validated,and the underground industrial test was carried out.Monitoring results show that the supporting technology of beam arch structure effectively controls the deep soft broken composite roof abscission layer and large deformation.It can maintain the deep soft broken compound roof coal roadway surrounding rock and supporting structure stability and safety.