长山子煤矿大倾角松软厚煤层综放工作面运输巷支护技术研究

发布时间：2018-03-28 17:16

本文选题：围岩稳定性　切入点：非对称载荷　出处：《西安科技大学》2015年硕士论文

【摘要】：大倾角松软厚煤层综放工作面运输巷围岩应力环境复杂,顶板易冒落,支护困难,影响矿井安全生产。研究大倾角松软厚煤层综放工作面运输巷支护技术,对丰富复杂条件下回采巷道支护技术具有重要意义。本文针对长山子煤矿1123综放工作面运输巷,通过现场调研、模拟研究、理论分析和现场监测相结合的研究方法,对大倾角松软厚煤层综放工作面运输巷围岩进行了较为系统地研究,结果表明:(1)支护体受载和围岩变形破坏呈非对称性特征。巷道以顶板失稳为特点,失稳形式分为两种,一种为从下帮侧拱角处诱发的围岩失稳,围岩首先从下帮侧拱角处发生破坏,破坏方式为:产生裂隙—弯曲—断裂—回转—垮落,顶板垮落过程分为回转垮落和下沉垮落,另一种为顶板离层诱发的顶板失稳,该失稳方式以下沉垮落为特点。(2)直墙圆弧拱形巷道下帮侧拱角处是围岩-支护‖结构体失稳诱发点,较矩形巷道,其围岩结构最大剪力平均降低46.5%,最大弯矩平均降低56.5%。(3)巷道顶板浅基点和深基点的离层预警值可由上覆岩层载荷、巷道宽度、围岩弹性模量、锚杆控制范围及锚索特性确定,长山子煤矿1123综放工作面运输巷顶板离层仪浅基点预警值为60mm,深基点预警值为140mm。(4)采用综掘工艺和以大、小结构理论‖为基础的锚网索+钢筋梯协调支护技术确定支护参数为锚杆间排距800×800mm,锚索间距1200mm,排距为1600mm。。现场监测表明,锚索受载锚杆受载,顶板锚杆受载下帮锚杆受载上帮锚杆受载,巷道支护参数适合于1123综放工作面运输巷,取得了良好的经济效益。
[Abstract]:The surrounding rock stress environment of transportation roadway is complex, the roof caving is easy to fall and the support is difficult, which affects the safe production of coal mine. This paper studies the supporting technology of the transportation roadway of the fully-mechanized caving face in the large inclined soft and thick coal seam. This paper aims at the transportation roadway of 1123 fully-mechanized caving face of Changshanzi Coal Mine, through field investigation, simulation study, theoretical analysis and field monitoring. This paper makes a systematic study on the surrounding rock of the transportation roadway in the fully-mechanized caving face with large dip angle and soft and thick coal seam. The results show that the load-bearing and the deformation failure of the wall rock are asymmetrical. The roadway is characterized by roof instability, which is divided into two types. One is the instability of the surrounding rock induced by the arch corner of the lower side side. The failure of the surrounding rock occurs from the arch corner of the lower side side at first. The failure mode is as follows: fissure-bending, fracture, revolution and collapse, and the process of roof collapse is divided into rotary collapse and sinking collapse. The other is the roof instability induced by roof separation, which is characterized by subsidence and collapse. The arch corner of the bottom side of the arc-arched roadway with straight wall is the point induced by the instability of surrounding rock and support structure, which is more than that of rectangular roadway. The maximum shear force of surrounding rock structure is reduced by 46.5, and the maximum bending moment is reduced by 56.55.The maximum bending moment is reduced by 56.5and 56.50.The early warning values of shallow base point and deep base point of roadway roof can be determined by the load of overlying rock, the width of roadway, the elastic modulus of surrounding rock, the control range of anchor rod and the characteristic of anchor cable. In Changshanzi Coal Mine 1123 fully mechanized caving face, the early warning value of shallow base point and 140mm. 4) is 60mm and 140mm respectively. Based on the theory of small structure, the supporting parameters are determined as 800 脳 800mm between anchors, 1200mm between anchors and 1600mm.The field monitoring shows that the anchor cables are loaded with anchors, and the supporting parameters are determined as 800 脳 800mm, 1200mm and 1600mm.The results of field monitoring show that the anchor cables are loaded. The roof bolt is loaded and the upper side bolt is loaded and the supporting parameters of roadway are suitable for the transportation roadway of 1123 fully mechanized caving face and good economic benefits have been obtained.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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