东坡煤矿综放开采区段煤柱稳定性研究

发布时间：2018-05-19 22:41

本文选题：综放开采 + 区段煤柱　；参考：《西安科技大学》2015年硕士论文

【摘要】：综合机械化放顶煤开采是我国厚煤层的主要开采方法之一,但具有回采率低的缺点,其中区段煤柱的损失量占到了36.7%。研究综放开采区段煤柱的稳定性及合理宽度留设,对保障回采巷道的稳定,提高煤炭资源回采率,具有重要的意义。本论文以东坡煤矿4号煤层综放工作面地质条件为背景,通过现场实测、力学实验、物理相似模拟、数值计算、理论分析等研究方法,对综放工作面区段煤柱的合理宽度进行了研究。通过现场实测和岩石力学测定,得出了东坡煤矿404综放工作面的矿压显现规律和煤岩物理力学参数,为工作面合理煤柱宽度的研究提供了基础。运用岩体的极限平衡理论得出了煤柱塑性区宽度,取中央弹性核宽度为2倍煤柱高度得出煤柱最小宽度为17.57 m。采用FLAC3D软件,得出了综放面不同宽度煤柱的变形破坏特征和支承压力分布规律,分析了煤柱的稳定性和合理宽度。通过物理相似模拟不同宽度煤柱,根据其变形、破坏状态和支承压力分布,得出煤柱宽度应不小于18 m。结合以上研究结果,在压力拱理论,有效区域理论和Wilson理论的基础上,按照充分采动的程度,将煤柱分为三种状态,提出了煤柱动态载荷模型。第一种为首区段煤柱“拱形”结构模型,煤柱主要承受采空区上方形成的“拱形”结构下部的载荷;第二种为多工作面非充分采动模型,为多煤柱支撑“拱形”结构,随着跨距增大,煤柱载荷也随之增大,载荷公式在第一种模型基础上按照拱高进行修正;第三种为充分采动模型,煤柱承受控制区上覆岩层的重量,计算煤柱载荷。在煤柱载荷模型的基础上,结合Obert-Dwvall/Wang岩体强度理论,进而给出了区段煤柱宽度的理论计算公式。论文的研究成果为东坡煤矿4号煤层综放工作面合理区段煤柱宽度留设提供了理论基础,并对相似条件下煤柱宽度的留设具有一定的借鉴参考价值。
[Abstract]:Synthetical mechanized top coal caving is one of the main mining methods of thick coal seam in our country, but it has the shortcoming of low recovery rate, in which the loss of coal pillar in section accounts for 36.7%. It is of great significance to study the stability and reasonable width of coal pillar in fully mechanized caving mining section to ensure the stability of mining roadway and to improve the recovery rate of coal resources. This paper takes the geological condition of No. 4 fully mechanized caving face in Dongpo Coal Mine as the background, through field measurement, mechanical experiment, physical similarity simulation, numerical calculation, theoretical analysis and other research methods. The reasonable width of coal pillar in fully-mechanized caving face is studied. Based on field measurement and rock mechanics measurement, the regularity of rock pressure behavior and the physical and mechanical parameters of coal and rock in 404 fully mechanized caving face of Dongpo Coal Mine are obtained, which provides a basis for the study of reasonable coal pillar width. The plastic zone width of coal pillar is obtained by using the limit equilibrium theory of rock mass, and the minimum width of coal pillar is 17.57 m when the width of central elastic core is 2 times the height of coal pillar. By using FLAC3D software, the characteristics of deformation and failure and the distribution of supporting pressure of coal pillars with different widths of fully mechanized caving face are obtained, and the stability and reasonable width of coal pillars are analyzed. According to its deformation, failure state and distribution of supporting pressure, it is concluded that the width of coal pillar should not be less than 18 m by simulating the different width of coal pillar by physical similarity. On the basis of the pressure arch theory, effective region theory and Wilson theory, and according to the degree of full mining, the coal pillar is divided into three kinds of states, and the dynamic load model of coal pillar is put forward. The first is the "arch" structure model of the coal pillar in the first section, which mainly bears the load of the "arch" structure formed above the goaf, and the second one is the multi-face incomplete mining model, which supports the "arch" structure with the multi-coal pillar. With the increase of span, the load of coal pillar also increases, the load formula is modified according to the arch height on the basis of the first model, and the third is the full mining model, the coal pillar bears the weight of overlying strata in the control area, and calculates the load of coal pillar. Based on the load model of coal pillar and Obert-Dwvall/Wang rock mass strength theory, the theoretical calculation formula of pillar width is given. The research results of this paper provide a theoretical basis for the reasonable length of pillar width in No. 4 fully mechanized caving face of Dongpo Coal Mine, and have a certain reference value for retaining the width of coal pillar under similar conditions.
【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】：TD822.3

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