【摘要】：本文以平煤十二礦的矸石充填協(xié)同垮落式混合綜采工作面的開采技術(shù)為背景,在分析其系統(tǒng)布置、工作面關(guān)鍵設(shè)備選型配套、充填與采煤工藝的基礎(chǔ)上,通過相似模擬與數(shù)值模擬手段研究了矸石充填協(xié)同垮落式混合綜采工作面礦壓顯現(xiàn)規(guī)律,取得以下成果:(1)基于相似模擬實(shí)驗(yàn),揭示了混采面垮落段、矸石充填段以及過渡段的裂隙發(fā)育與巖層移動(dòng)規(guī)律,得出垮落段覆巖移動(dòng)表現(xiàn)為“三帶”規(guī)律,而矸石充填段覆巖以裂隙帶和彎曲下沉帶為主,垮落帶發(fā)育相對(duì)較弱,且隨矸石充填段長度與垮落段長度之比減小而裂隙帶高度增加,頂板活動(dòng)明顯增加,礦壓顯現(xiàn)明顯。(2)揭示了混采面推進(jìn)長度和矸石充填段長度對(duì)混采面覆巖垂直應(yīng)力影響規(guī)律,得出覆巖垂直應(yīng)力主要集中在采空區(qū)邊界及工作面過渡段處,且隨著工作面的推進(jìn)和矸石充填段的減小逐漸增加,同時(shí)垮落段覆巖垂直應(yīng)力明顯小于矸石充填段。(3)探討了混采面推進(jìn)長度和矸石充填段長度對(duì)頂板下沉形式以及過渡段長度的影響規(guī)律,得出混采面垮落段采空區(qū)覆巖移動(dòng)明顯大于矸石充填段,且頂板下沉總體呈現(xiàn)“瓢型”分布,同時(shí)其最大下沉處偏離混采面中心位置,且位置隨著工作面推進(jìn)保持不變,但下沉量隨矸石充填段長度的增加而增加。對(duì)于混采面過渡段長度而言,其隨著混采面推進(jìn)及矸石充填段長度的減小而增加,并最終趨于穩(wěn)定,具體變化范圍為6.2m~13.5 m,若對(duì)應(yīng)于1.5 m寬度的液壓支架為4~9架。(4)依據(jù)平煤十二礦己15-31010矸石充填協(xié)同垮落式混合綜采工作面工程實(shí)踐,基于過渡段隨混采面推進(jìn)長度的變化規(guī)律,同時(shí)考慮過渡段瓦斯積聚、液壓支架支護(hù)強(qiáng)度給出了過渡段液壓支架個(gè)數(shù),并分析了垮落段、矸石充填段和過渡段的液壓支架支撐阻力大小及分布規(guī)律,確定了混采面以上三段的初次來壓及周期來壓步距,給出了矸石充填段和垮落段的煤體支承應(yīng)力隨混采面推進(jìn)的變化規(guī)律,并印證了混采面矸石充填段與垮落段的覆巖垂直應(yīng)力特征。
[Abstract]:Based on the mining technology of coal gangue filling combined with caving type fully mechanized mining face in No. 12 Coal Mine, this paper analyzes its system arrangement, key equipment selection and matching, filling and coal mining technology. By means of similarity simulation and numerical simulation, the regularity of rock pressure behavior of coal gangue filling combined caving combined fully mechanized mining face is studied. The following results are obtained: (1) based on the similarity simulation experiment, the caving section of mixed mining face is revealed. The law of fracture development and strata movement in gangue filling section and transition section shows that the overburden movement of caving section is characterized by "three zones", while the overburden rock of gangue filling section is dominated by fracture zone and bending subsidence zone, and the development of collapse zone is relatively weak. With the decrease of the ratio of the length of the gangue filling section to the length of the caving section, the height of the fracture zone increases, and the roof activity increases obviously. (2) the influence of the length of mixing face and the length of gangue filling section on the vertical stress of overburden is revealed. It is concluded that the vertical stress of overburden is mainly concentrated at the boundary of goaf and the transitional section of working face. And with the advance of working face and the decrease of gangue filling section, At the same time, the vertical stress of overburden in caving section is obviously smaller than that in gangue filling section. (3) the influence of the propulsive length of mixed mining face and the length of gangue filling section on the roof subsidence and the length of transition section are discussed. It is concluded that the overlying rock movement of goaf in caving section of mixed mining face is obviously larger than that of gangue filling section, and the roof subsidence is generally "ladle" distribution, and its maximum subsidence deviates from the central position of mixed mining face, and the position remains unchanged with the advance of working face. However, the amount of subsidence increases with the increase of the length of the gangue filling section. For the length of the transitional section of the mixed mining face, it increases with the mixing face advancing and the length of the gangue filling section decreases, and finally tends to be stable, and the specific range of variation is 6.2m~13.5 m. If there are 49 hydraulic supports corresponding to 1.5 m width. (4) according to the engineering practice of 15 ~ 31010 gangue filling and combined caving type fully mechanized mining face in No. 12 Coal Mine, based on the changing law of transition section with the advancing length of mixed mining face, At the same time, considering the gas accumulation in the transition section, the support strength of the hydraulic support gives the number of the hydraulic support in the transition section, and analyzes the size and distribution of the supporting resistance of the hydraulic support in the caving section, the gangue filling section and the transition section. The initial pressure and periodic pressure step of the three sections above the mixed mining face are determined, and the variation law of the supporting stress of coal body in the gangue filling section and the caving section with the advance of the mixed mining face is given. The vertical stress characteristics of overburden in gangue filling section and caving section of mixed mining face are confirmed.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD32;TD823

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