俯仰斜开采工作面煤壁失稳破坏机理及控制

发布时间：2018-07-23 12:44

【摘要】：工作面煤壁失稳破坏机理与控制一直是矿山压力与岩层控制研究的热点与难点之一。已有研究表明,影响俯斜、仰斜工作面煤壁失稳破坏形式的因素较多,目前的研究多集中在宏观规律的观测与总结,而进行微细观研究以探究其失稳机理的研究较少。因此,进一步开展俯仰采工作面煤壁失稳破坏机理及控制研究具有重要现实与理论意义。本文利用数值计算方法从煤壁失稳的宏观和微观角度出发,研究了俯仰采工作面煤壁失稳破坏机理及控制以期为工作面煤壁稳定性的控制提供有益帮助。论文基于实验室受压煤体的塑性软化特征对俯仰斜开采工作面煤壁失稳破坏机理进行了理论分析,利用弹塑性力学推导出了俯仰斜开采工作面前方煤体塑性区宽度的计算公式,并分析了影响俯仰采工作面煤壁塑性区宽度的主要因素。采用数值计算方法对比分析了水平开采、俯斜开采、仰斜开采工作面煤壁上方支承压力分布的差异;从煤壁宏观和微观破坏角度总结了不同开采角度下工作面煤壁主要破坏形式与破坏位置,阐明了俯斜、仰斜开采后方顶板破断特征对工作面煤壁稳定性的影响,系统分析了埋深、采高、工作面推进速度、煤体强度、支架支护阻力、俯仰角对工作面煤壁稳定性的影响。以单节理岩块为基础,从岩块的变形破坏、裂隙发育、强度损伤等角度,采用数值模拟方法研究了节理的尺寸、位置、角度对岩块的影响;数值分析了俯仰斜开采时含单节理及考虑节理与煤层层理交叉时工作面煤壁失稳破坏机理,初步阐明了节理对俯仰斜开采工作面煤壁稳定性的影响,揭示了节理与煤层层理交叉时,俯仰斜开采工作面煤壁的不同破坏特征。针对论文研究结果提出了俯仰斜开采工作面煤壁控制技术思路。通过现场观测卧龙湖矿工作面煤壁片帮特征,实测工作面超前支承压力、监测工作面支架初撑力等,总结了卧龙湖矿工作面煤壁片帮的主要原因,并结合论文研究结果,提出了卧龙湖矿工作面煤壁稳定性控制措施。
[Abstract]:The failure mechanism and control of coal face wall instability has been one of the hot and difficult points in the study of mine pressure and strata control. It has been shown that there are many factors that affect the failure form of coal wall in inclined face and upside-down working face. At present, most of the researches focus on the observation and summary of macroscopic law, but there are few studies on microscopical study to explore the mechanism of instability of coal wall. Therefore, it is of great practical and theoretical significance to further study the failure mechanism and control of coal wall in pitching mining face. Based on the macroscopic and microscopic aspects of coal wall instability, this paper studies the failure mechanism and control of coal wall instability in pitching mining face in order to provide useful help for the control of coal wall stability. Based on the plastic softening characteristics of coal body under pressure in laboratory, the failure mechanism of coal wall in pitching inclined mining face is theoretically analyzed, and the formula for calculating the width of plastic zone in front of pitching coal mining face is derived by using elastoplastic mechanics. The main factors influencing the width of plastic zone of coal wall in pitching mining face are analyzed. The difference of supporting pressure distribution on coal wall in horizontal mining, inclined mining and inclined mining face is analyzed by using numerical calculation method. From the macroscopic and microscopic failure angles of coal wall, the main failure forms and failure positions of coal wall in different mining angles are summarized, and the influence of roof breaking characteristics on the stability of coal face wall is expounded. The influence of the depth of the coal, the mining height, the speed of working face, the strength of coal body, the support resistance and the pitch angle on the stability of coal wall are analyzed systematically. Based on single jointed rock block, the influence of joint size, position and angle on rock mass is studied by numerical simulation from deformation failure, fracture development, strength damage and so on. In this paper, the failure mechanism of coal face wall with single joint in pitching inclined mining and considering the intersection of joint and seam stratification is analyzed numerically, and the influence of joint on coal wall stability in pitching inclined mining face is preliminarily expounded. The different failure characteristics of coal face wall in pitching inclined mining face are revealed when joint and seam bedding cross. Based on the research results of the paper, the technical thinking of coal wall control in pitching inclined mining face is put forward. By observing the characteristics of coal wall in Wolong Lake coal face, measuring the leading supporting pressure of working face and monitoring the initial support force of coal face, this paper summarizes the main reasons of coal wall slab in Wolong Lake coal face, and combines the research results of this paper. The stability control measures of coal face wall in Wolong Lake Coal Mine are put forward.
【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】：TD323

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