受采动顶板回采巷道围岩稳定性分析及控制技术研究

发布时间：2018-03-05 19:05

本文选题：坚硬顶板　切入点：采空区下　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以10202运输巷为工程背景,在系统研究新生矿巷道矿压特征、巷道的支护现状及围岩变形破坏特征的基础上,采用现场取样、实验室试验、数值模拟和理论分析等研究方法,对新生矿9#煤层采空区下10#煤层回采巷道围岩稳定性分类及控制技术进行研究。为了达到矿井安全、经济、有效的目标,以便于实现新生矿巷道支护设计的系统化、科学化和定量化,改变巷道支护靠工程类比或经验设计的历史状况,降低一次成巷支护成本,减少由于巷道受到变形破坏的维修工程量。其主要研究结论如下： (1)对9#煤底板采空区破坏深度范围及煤柱载荷作用下底板应力分布规律进行了研究,为研究10#煤回采巷道的变形破坏程度及受力情况提供了理论依据。 (2)根据现场取芯及实验室测定,得到了得到了新生煤矿10102运输巷的围岩力学参数,巷道围岩参数测试结果为理论计算及数值模拟提供了参数依据,同时也将为后续的支护参数设计及顶板管理提供科学依据。 (3)针对10202运输巷的地质条件,提出了采用顶板锚网索+钢带、帮部锚网的支护方式,并在掘进期间对10202运输巷道进行了现场实测,测试结果表明在掘进期间掘进工作面前、后方21m左右的范围内巷道围岩基本处于稳定阶段,锚杆受力变化较小,没有发生离层现象。 (4)根据10202运输巷赋存及地质条件及岩石力学试验参数为数值模拟的基础参数,建立模型,对10202运输巷在掘进及工作面回采期间巷道围岩变形破坏特征进行三维有限差分数值模拟研究,并结合10202运输巷在掘进期间的现场矿压观测结果,确定了10煤主采巷道为锚杆支护形式,提出了锚网索联合支护方式并给出了支护参数。
[Abstract]:Based on the engineering background of 10202 transport roadway, on the basis of systematically studying the characteristics of roadway pressure, the supporting status of roadway and the characteristics of deformation and failure of surrounding rock, the research methods such as field sampling, laboratory test, numerical simulation and theoretical analysis are adopted in this paper. The stability classification and control technology of surrounding rock in mining roadway of No. 10# coal seam under the goaf of No. 9# coal seam in new coal mine are studied. In order to achieve the goal of safety, economy and efficiency of coal mine, it is convenient to realize the systematization of roadway support design in new coal mine. Scientific and quantitative, changing the historical situation of engineering analogy or experience design of roadway support, reducing the cost of primary roadway support and reducing the amount of maintenance works due to roadway deformation and destruction. The main research conclusions are as follows:. 1) the depth of damage in goaf of 9# coal floor and the stress distribution law of floor under the action of coal pillar load are studied, which provides a theoretical basis for studying the degree of deformation and failure and the stress situation of coal mining roadway of 10#. The mechanical parameters of surrounding rock of No. 10102 transport roadway in Xinxing Coal Mine are obtained according to the field coring and laboratory measurements. The test results of surrounding rock parameters of the roadway provide a parameter basis for theoretical calculation and numerical simulation. At the same time, it will provide scientific basis for the design of supporting parameters and roof management. In view of the geological conditions of 10202 transport roadway, the supporting method of roof bolting net cable steel belt and bolting net is put forward, and the site measurement of 10202 transport roadway is carried out during the excavation. The test results show that in front of the tunneling work during the excavation period, The surrounding rock of roadway is basically in the stable stage in the range of 21 m or so in the rear, and the stress of the bolt changes little, and there is no phenomenon of separation. According to the occurrence, geological conditions and rock mechanics test parameters of 10202 transport roadway as the basic parameters of numerical simulation, the model is established. The deformation and failure characteristics of surrounding rock of 10202 transport roadway during tunneling and mining face are studied by 3D finite difference numerical simulation, and combined with the field ground pressure observation results of 10202 transport roadway during tunneling. The bolting support form of 10 coal main mining roadway is determined, and the combined support mode of anchor, mesh and cable is put forward and the supporting parameters are given.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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