【摘要】：工作面煤壁失穩(wěn)破壞機理與控制一直是礦山壓力與巖層控制研究的熱點與難點之一。已有研究表明,影響俯斜、仰斜工作面煤壁失穩(wěn)破壞形式的因素較多,目前的研究多集中在宏觀規(guī)律的觀測與總結,而進行微細觀研究以探究其失穩(wěn)機理的研究較少。因此,進一步開展俯仰采工作面煤壁失穩(wěn)破壞機理及控制研究具有重要現(xiàn)實與理論意義。本文利用數(shù)值計算方法從煤壁失穩(wěn)的宏觀和微觀角度出發(fā),研究了俯仰采工作面煤壁失穩(wěn)破壞機理及控制以期為工作面煤壁穩(wěn)定性的控制提供有益幫助。論文基于實驗室受壓煤體的塑性軟化特征對俯仰斜開采工作面煤壁失穩(wěn)破壞機理進行了理論分析,利用彈塑性力學推導出了俯仰斜開采工作面前方煤體塑性區(qū)寬度的計算公式,并分析了影響俯仰采工作面煤壁塑性區(qū)寬度的主要因素。采用數(shù)值計算方法對比分析了水平開采、俯斜開采、仰斜開采工作面煤壁上方支承壓力分布的差異;從煤壁宏觀和微觀破壞角度總結了不同開采角度下工作面煤壁主要破壞形式與破壞位置,闡明了俯斜、仰斜開采后方頂板破斷特征對工作面煤壁穩(wěn)定性的影響,系統(tǒng)分析了埋深、采高、工作面推進速度、煤體強度、支架支護阻力、俯仰角對工作面煤壁穩(wěn)定性的影響。以單節(jié)理巖塊為基礎,從巖塊的變形破壞、裂隙發(fā)育、強度損傷等角度,采用數(shù)值模擬方法研究了節(jié)理的尺寸、位置、角度對巖塊的影響;數(shù)值分析了俯仰斜開采時含單節(jié)理及考慮節(jié)理與煤層層理交叉時工作面煤壁失穩(wěn)破壞機理,初步闡明了節(jié)理對俯仰斜開采工作面煤壁穩(wěn)定性的影響,揭示了節(jié)理與煤層層理交叉時,俯仰斜開采工作面煤壁的不同破壞特征。針對論文研究結果提出了俯仰斜開采工作面煤壁控制技術思路。通過現(xiàn)場觀測臥龍湖礦工作面煤壁片幫特征,實測工作面超前支承壓力、監(jiān)測工作面支架初撐力等,總結了臥龍湖礦工作面煤壁片幫的主要原因,并結合論文研究結果,提出了臥龍湖礦工作面煤壁穩(wěn)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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD323

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