巷道顶板蝶叶塑性区穿透致冒机理与控制方法
发布时间：2019-02-13 01:32
【摘要】：针对高偏应力环境下层状顶板巷道冒顶事故频发、支护困难等问题,采用理论分析、数值模拟、现场探测和现场工程试验等综合研究方法,揭示了层状顶板巷道蝶叶塑性区的分布规律,阐明了蝶叶塑性区穿透分布致使巷道冒顶的力学机制,结果表明:蝶叶塑性区具有隔层穿透发育的特征,未发生塑性破坏岩层的存在不能阻断蝶叶塑性区在软弱岩层形成;顶板蝶叶塑性区穿透分布伴有强烈的变形压力,使软弱岩层塑性区下位未发生塑性破坏岩层受到持续巨大的"挤压"载荷,致使其发生断裂破坏,是巷道存在冒顶隐患的内在原因。据此提出了防止此类巷道冒顶的关键在于维护塑性区围岩稳定,需锚杆(索)长度大于塑性区边界,且具备可承受大变形而不破断的能力。基于以上研究,对神东保德矿81306二号回风巷进行了支护补强设计和试验,试验结果表明该支护对策能够有效维持巷道顶板稳定。
[Abstract]:In order to solve the problems of frequent roof fall accidents and difficult support in the high deflection stress environment, a comprehensive research method, such as theoretical analysis, numerical simulation, field detection and field engineering test, is adopted. The distribution law of the sphenoid leaf plastic zone in the layered roof roadway is revealed, and the mechanical mechanism of the sphenoid leaf plastic zone penetration distribution resulting in the roof falling of the laneway is clarified. The results show that the sphenoid leaf plastic zone has the characteristics of the development of interlayer penetration. The absence of plastic failure can not block the formation of the sphenoid plastic zone in the weak rock strata. The penetrating distribution of plastic zone of the sphenoid leaves of the roof is accompanied by strong deformation pressure, so that no plastic damage occurs in the plastic zone of the weak rock layer, and the rock layer is subjected to a continuous "extrusion" load, which results in the fracture failure. It is the inherent reason of the hidden danger of roof fall in roadway. The key to prevent the roof fall of this kind of roadway is to maintain the stability of surrounding rock in plastic zone, the length of anchor rod (cable) is larger than the boundary of plastic zone, and the ability to withstand large deformation without breaking is put forward. Based on the above research, the supporting reinforcement design and test of No. 81306 backwind roadway in Shendong Baode Mine are carried out. The experimental results show that the supporting countermeasures can effectively maintain the roof stability of the roadway.
【作者单位】： 河南理工大学能源科学与工程学院;煤炭安全生产河南省协同创新中心;中国矿业大学(北京)资源与安全工程学院;
【基金】：河南省教育厅高等学校重点科研项目资助(16A440006) 河南理工大学博士基金项目资助(660207/007)
【分类号】：TD353;TD327.2
本文编号：2421033
[Abstract]:In order to solve the problems of frequent roof fall accidents and difficult support in the high deflection stress environment, a comprehensive research method, such as theoretical analysis, numerical simulation, field detection and field engineering test, is adopted. The distribution law of the sphenoid leaf plastic zone in the layered roof roadway is revealed, and the mechanical mechanism of the sphenoid leaf plastic zone penetration distribution resulting in the roof falling of the laneway is clarified. The results show that the sphenoid leaf plastic zone has the characteristics of the development of interlayer penetration. The absence of plastic failure can not block the formation of the sphenoid plastic zone in the weak rock strata. The penetrating distribution of plastic zone of the sphenoid leaves of the roof is accompanied by strong deformation pressure, so that no plastic damage occurs in the plastic zone of the weak rock layer, and the rock layer is subjected to a continuous "extrusion" load, which results in the fracture failure. It is the inherent reason of the hidden danger of roof fall in roadway. The key to prevent the roof fall of this kind of roadway is to maintain the stability of surrounding rock in plastic zone, the length of anchor rod (cable) is larger than the boundary of plastic zone, and the ability to withstand large deformation without breaking is put forward. Based on the above research, the supporting reinforcement design and test of No. 81306 backwind roadway in Shendong Baode Mine are carried out. The experimental results show that the supporting countermeasures can effectively maintain the roof stability of the roadway.
【作者单位】： 河南理工大学能源科学与工程学院;煤炭安全生产河南省协同创新中心;中国矿业大学(北京)资源与安全工程学院;
【基金】：河南省教育厅高等学校重点科研项目资助(16A440006) 河南理工大学博士基金项目资助(660207/007)
【分类号】：TD353;TD327.2
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