大断面综放沿空煤巷顶板破坏机制与锚索桁架控制

发布时间：2018-04-08 11:43

本文选题：煤巷　切入点：沿空掘巷　出处：《采矿与安全工程学报》2017年01期

【摘要】：针对大断面综放沿空煤巷掘进过程中存在的支护难题,以王家岭煤矿20103区段运输平巷为工程背景,采用现场调研、数值模拟和井下试验等手段进行破坏机制与控制技术研究。结果表明:1)综放沿空煤巷顶板存在强烈的不对称下沉和水平挤压错动变形,煤柱侧顶板破碎严重,煤柱帮挤出变形显著;2)关键块回转运动引起沿空煤巷围岩性质和支承压力沿巷道中心轴两侧存在明显不对称性分布,其必然导致矿山压力显现的不对称性,关键块回转使得顶板岩层产生水平运动,进而导致岩层错动、滑移、膨胀形成挤压破碎带并压迫支护结构;3)关键块B的回转运动是综放沿空煤巷异常矿压显现的根本原因,顶板最大垂直位移位于巷道中心偏煤柱侧200~600mm范围内,最大水平位移量达250 mm,0水平位移点向实体煤侧偏移约0.9 m。提出了以不对称锚梁桁架为核心的综合控制系统,阐述了其减弱外部应力传递,加强煤柱侧顶板支护,适应顶板岩层水平运动及防治冒顶的原理。在上述研究基础上,结合王家岭地质生产条件进行支护参数设计,并进行现场应用。工程实践表明,该支护技术能够有效保证巷道顶板围岩稳定。
[Abstract]:In view of the difficult supporting problems existing in the driving process of large-section fully-mechanized caving caving along goaf roadway, taking the 20103 section transportation roadway of Wangjialing Coal Mine as the engineering background, field investigation, numerical simulation and underground test were adopted to study the failure mechanism and control technology.The results show that there are strong asymmetrical subsidence and horizontal extrusion staggered deformation in the roof along the goaf of fully-mechanized caving caving, and the roof of the coal pillar side is broken seriously.(2) the rotational movement of the key blocks causes obvious asymmetry distribution of surrounding rock and supporting pressure along the central axis of the roadway, which will inevitably lead to the asymmetry of mine pressure.The rotation of the key block causes horizontal movement of the roof strata, which leads to the dislocation, slip and expansion of the strata to form a crushing zone and press the supporting structure. The rotational movement of the key block B is the fundamental cause of abnormal rock pressure in the coal roadway along the goaf of fully mechanized caving caving.The maximum vertical displacement of roof is located within the 200~600mm range of coal pillar side in the center of roadway, and the maximum horizontal displacement is 250mm / 0 and the displacement point is about 0.9 m to the solid coal side.A comprehensive control system with asymmetric anchor beam truss as the core is put forward. The principles of reducing the external stress transfer, strengthening the side roof support of coal pillar, adapting to the horizontal movement of roof strata and preventing roof falling are expounded.On the basis of the above research, combined with Wangjialing geological production conditions, the supporting parameters are designed and applied in the field.Engineering practice shows that the supporting technology can effectively ensure the stability of roadway roof surrounding rock.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;
【基金】：国家自然科学基金项目(51574243) 中央高校基本科研业务费专项资金项目(2010YZ02;2010YZ02)
【分类号】：TD327.2;TD353

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