漳村煤矿采动巷道底鼓机理分析与控制研究

发布时间：2019-05-09 19:58

【摘要】：底鼓是一种极为普遍的巷道变形现象，直接关系到巷道安全和煤炭生产。对采动巷道底鼓机制及控制技术的研究是采矿业一个重要的课题，许多专家学者也做了很多的深入研究，并获得了大量的结论和成果。然而，基于巷道状况和应力环境具有复杂多变的特性，这些理论和成果不能够充分解决巷道底鼓的问题。除此之外，传统的底鼓控制措施主要集中在巷道的两帮或顶板进行，至于底板及角部对底鼓的影响相关经验却并不充分。基于此，本文以漳村煤矿21材料巷道为研究背景，运用实地考察、理论分析、数值模型相结合的手段探讨了采动影响下煤层巷道的底鼓机理及其防治对策。本文主要内容如下：（1）运用岩石力学、土力学、弹塑性力学等相关理论分析了采动巷道的底鼓机制及力学特性；（2）对漳村煤矿材料巷道的工程地质情况进行了现场调研，并通过现场观测以及漳村煤矿已有资料得到巷道变形情况和弹性模量、泊松比、抗压强度等物理力学参数；（3）研究分析漳村煤矿材料巷道底鼓的主要因素，包括应力状态、围岩性质、水理性质、支护强度等，得出此巷道为挤压流动性底鼓；从理论上对巷道的情况进行分析，得知围岩性质、支护方法和采动所引起的支承应力是底鼓主要原因，应主要侧重这三方面来控制底鼓；（4）基于对漳村煤矿材料巷道底鼓机理的研究，在现有支护基础上提出三种防治对策：①定向水力压裂巷道顶板②定向水力压裂巷道顶板+锚杆加固底板和底角③锚杆加固底板和底角，并运用Flac3D数值模拟软件对现有支护及三种方案下的巷道变形分别进行数值模拟，从弹塑性区域分布、应力分布和位移分布三个角度对模拟结果进行分析，对比三种支护方案的优劣。
[Abstract]:Bottom heave is a very common phenomenon of roadway deformation, which is directly related to roadway safety and coal production. The research on the mechanism and control technology of mining roadway bottom heave is an important subject in mining industry. Many experts and scholars have also done a lot of in-depth research, and have obtained a lot of conclusions and results. However, based on the complex and changeable characteristics of roadway condition and stress environment, these theories and achievements can not fully solve the problem of roadway bottom heave. In addition, the traditional bottom drum control measures mainly focus on the two sides of the roadway or roof, as for the bottom plate and the corner of the influence of the bottom drum experience is not sufficient. Based on this, this paper takes 21 material roadway in Zhangcun Coal Mine as the research background, and discusses the bottom heave mechanism and prevention countermeasures of coal seam roadway under the influence of mining by means of field investigation, theoretical analysis and numerical model. The main contents of this paper are as follows: (1) using rock mechanics, soil mechanics, elasto-plastic mechanics and other related theories to analyze the mechanism and mechanical characteristics of floor bulging of mining roadway; (2) the engineering geological conditions of the material roadway in Zhangcun Coal Mine are investigated on the spot, and the physical and mechanical parameters such as deformation and elastic modulus, Poisson's ratio, compressive strength and so on are obtained through the field observation and the existing data of Zhangcun Coal Mine. (3) the main factors of bottom heave of material roadway in Zhangcun Coal Mine are studied and analyzed, including stress state, surrounding rock property, hydraulic property, support strength and so on. Based on the theoretical analysis of the situation of roadway, it is found that the nature of surrounding rock, the supporting method and the supporting stress caused by mining are the main reasons for the bottom heave, and these three aspects should be mainly emphasized to control the bottom heave. (4) based on the study of the mechanism of bottom heave of material roadway in Zhangcun Coal Mine, On the basis of the existing support, three preventive measures are put forward: (1) Roof of directional hydraulic fracturing roadway (Roof) and (2) Roof of directional hydraulic fracturing roadway (Roof) and 3 anchors (bottom angle) to reinforce the floor and bottom angle, And using Flac3D numerical simulation software to carry on the numerical simulation to the existing support and the tunnel deformation under the three kinds of schemes separately, from the elasto-plastic area distribution, the stress distribution and the displacement distribution to carry on the analysis to the simulation result. The advantages and disadvantages of the three support schemes are compared.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD327.3

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