深井层状围岩挠曲褶皱性底鼓机理与控制技术

发布时间：2018-06-25 07:32

本文选题：深井 + 层状围岩　；参考：《中国矿业大学》2015年硕士论文

【摘要】：针对深井层状围岩挠曲褶皱性底鼓的重大技术难题,应用理论分析、数值模拟和工程验证等综合手段,研究了巷道底板岩层变形破坏的挠曲方程、岩层内弯曲应力以及底板岩层的极限承载力,分析了底板分区滑移破坏及岩层运移规律,提出了反底拱锚固梁和U型钢封闭支架两种控制技术,得出的主要结论如下：(1)应用弹塑性板壳理论,建立了巷道层状底板的弹性薄板力学模型,基于矩形薄板小挠度理论,得出了底板岩层的挠曲变形方程的解析解,根据底板岩层发生挠曲褶皱性底鼓的临界破断条件,分析了层状底板岩层的弯曲应力,推导并求解出底板关键岩层的极限承载力下限值的表达式。(2)根据底板岩层失稳的滑移线场模型,可将底板层状围岩划分为主动破坏区、挤压过渡区和挤压被动区三种破坏区域,其中底板主动区(帮部塑性区下方的底板岩层)与地平线分别成方向做整体移动,挤压过渡区岩层分别绕底角两点与径向正交做整体移动,而挤压被动区则是在挤压被动区的带动下向巷道临空方向变形,位移方向为垂直向上运动。(3)研究了U型钢反拱梁控制底鼓的失稳破坏过程,建立了两铰反拱受力模型,采用ANSYS软件分析得出了U25、U29和U36等型钢反拱梁临界屈曲载荷与极限承载力的关系,反拱圆心角为70。(即反拱拱高为0.8m)时屈曲载荷最达,承载系统较为稳定；通过建立反底拱锚固梁结构力学模型,分析锚固梁协同承载,推导了反底拱锚固梁的支护强度力学表达式,提出了设计方法和校对准则；通过求解直墙半圆拱U型钢封闭支架的内力弯矩,利用强度校核法求得支架承受的的最大均布载荷q,并通过叠加原理可计算出封闭支架的承载力,形成了封闭支架控底的设计思路。(4)结合淮南潘一东矿-848西翼胶带机大巷三联巷以及大屯孔庄矿-1015水平马头门底鼓治理工程,进行了U型钢全封闭支架和反底拱锚固梁工业性试验,两处巷道维护周期均已达3a左右,底鼓变形量控制在安全使用范围内,尤其是孔庄矿-1015水平马头门底鼓量小于10mm,验证技术方案的可靠和有效,为深井层状围岩巷道挠曲褶皱性底鼓的一条行之有效的技术途径。
[Abstract]:In view of the major technical problems of deep well bedded wall rock flexural folded floor heave, the deflection equation of roadway floor rock is studied by means of theoretical analysis, numerical simulation and engineering verification. The bending stress in rock layer and the ultimate bearing capacity of bottom rock layer are analyzed. The law of subdivision slip failure and rock layer migration are analyzed. Two control techniques, Anchorage beam with reverse bottom arch and closed support with U-shaped steel, are put forward. The main conclusions are as follows: (1) based on the theory of elastic-plastic plate and shell, the elastic thin plate mechanics model of layered floor of roadway is established. Based on the theory of small deflection of rectangular thin plate, the analytical solution of deflection equation of floor rock is obtained. According to the critical breaking condition of flexural folded floor bulge in bottom rock, the bending stress of layered bottom rock is analyzed. The expression of the lower limit value of the ultimate bearing capacity of the key rock layer of the bottom plate is derived and solved. (2) according to the slip line field model of the instability of the rock layer of the bottom plate, the layered surrounding rock of the bottom plate can be divided into three kinds of failure areas: active failure zone, extrusion transition zone and squeeze passive zone. Among them, the active zone of the bottom plate (the rock layer below the plastic zone of the help part) and the horizon move in the direction of the whole respectively, and the strata of the extrusion transition zone move around the bottom angle two points and the radial direction respectively. While the extrusion passive zone is driven by the extrusion passive zone and the direction of displacement is vertical upward. (3) the unstable failure process of the U-shaped steel reverse arch beam controlled by the bottom drum is studied, and the stress model of the two-hinged reverse arch is established. The relationship between critical buckling load and ultimate bearing capacity of U25U29 and U36 steel invert arch beams is obtained by ANSYS software. The center angle of reverse arch is 70. When the height of the reverse arch is 0.8m, the buckling load is the best and the bearing system is more stable. By establishing the structural mechanics model of the Anchorage beam of the reverse bottom arch, the mechanical expression of the supporting strength of the Anchorage beam is deduced by analyzing the synergistic bearing capacity of the Anchorage beam. The design method and proofreading criterion are put forward, by solving the internal force bending moment of the U-shaped steel closed support of the straight wall semi-circular arch, the maximum uniform load Q of the support is obtained by using the strength check method, and the bearing capacity of the closed support can be calculated by the superposition principle. The design idea of controlling bottom of closed support is formed. (4) combined with Sanlian roadway of belt machine in West Wing of Panyidong Mine in Huainan, and horizontal Horsehead Gate bottom Drum treatment Project in Kongzhuang Coal Mine of Datun, The industrial tests of U-shaped steel fully closed support and reverse bottom arch Anchorage beam are carried out. The maintenance period of both roadways has reached about 3 years, and the deformation of bottom heave is controlled within the safe application range. Especially in Kongzhuang Mine -1015 horizontal Horsehead Gate floor bulging is less than 10mm, which verifies the reliability and effectiveness of the technical scheme, and is an effective technical way for flexural folded bottom heave in deep well surrounding rock roadway.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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