發(fā)布時(shí)間：2018-07-16 20:34

【摘要】：大同礦區(qū)雙系煤層開采條件下堅(jiān)硬頂板大面積懸露突然垮斷時(shí),易造成工作面礦壓顯現(xiàn)加劇,來壓強(qiáng)度大,嚴(yán)重影響工作面正常生產(chǎn),威脅井下人員的生命安全,因此,研究大同礦區(qū)雙系煤層開采頂板大范圍運(yùn)動(dòng)規(guī)律及頂板結(jié)構(gòu)失穩(wěn)條件,對(duì)于堅(jiān)硬頂板條件下工作面礦壓顯現(xiàn)規(guī)律及頂板控制具有重要的現(xiàn)實(shí)意義和理論價(jià)值。采用物理相似模擬及計(jì)算機(jī)數(shù)值計(jì)算的方法,研究了雙系煤層開采過程中覆巖破斷結(jié)構(gòu)特征及應(yīng)力場(chǎng)、位移場(chǎng)的分布規(guī)律。研究表明,侏羅系遺留煤柱影響深度約63m,水平影響區(qū)域范圍為35~40m,最大應(yīng)力集中系數(shù)為3.14,石炭系綜放煤層下位堅(jiān)硬直接頂呈不同步垮落失穩(wěn),上位關(guān)鍵層初次斷裂步距較大,且主關(guān)鍵層的失穩(wěn)導(dǎo)致雙系煤層采空區(qū)貫通,覆巖頂板結(jié)構(gòu)漸次向上擴(kuò)展,結(jié)構(gòu)形態(tài)為“下位組合懸臂梁結(jié)構(gòu)-上位多層砌體梁結(jié)構(gòu)”,該結(jié)構(gòu)作為石炭系煤層覆巖頂板中的骨架,對(duì)工作面礦壓顯現(xiàn)起到?jīng)Q定性作用。通過理論分析,對(duì)頂板結(jié)構(gòu)的漸次擴(kuò)展范圍進(jìn)行判定,分析不同結(jié)構(gòu)形式下其失穩(wěn)的力學(xué)條件及失穩(wěn)方式,并結(jié)合同忻煤礦8101工作面實(shí)際生產(chǎn)條件,對(duì)現(xiàn)場(chǎng)礦壓顯現(xiàn)規(guī)律進(jìn)行實(shí)測(cè),結(jié)果顯示,工作面下位堅(jiān)硬頂板初次來壓步距約106m左右,上位亞關(guān)鍵層初次來壓步距為133.5m,工作面周期來壓步距約17m,來壓強(qiáng)度呈一強(qiáng)一弱周期性交替顯現(xiàn),強(qiáng)弱周期性交替來壓與下位堅(jiān)硬直接頂及上位亞關(guān)鍵層的周期性破斷一致,該礦壓顯現(xiàn)規(guī)律與“漸次擴(kuò)展結(jié)構(gòu)”失穩(wěn)運(yùn)動(dòng)的理論分析相吻合。研究結(jié)果對(duì)大同礦區(qū)石炭系煤層開采礦壓顯現(xiàn)規(guī)律及支架選型具有指導(dǎo)意義及理論價(jià)值。
[Abstract]:When the hard roof overhanging suddenly collapses under the condition of double-system coal seam mining in Datong mining area, it is easy to cause the coal pressure of the working face to appear worse and the pressure intensity is large, which will seriously affect the normal production of the working face and threaten the life and safety of the downhole personnel. It is of great practical significance and theoretical value to study the large range movement law of roof and the unstable condition of roof structure in Datong coal mining area, which is of great practical significance and theoretical value for the rock pressure behavior law and roof control of working face under the condition of hard roof. By using the method of physical similarity simulation and computer numerical calculation, the characteristics of overburden fracture structure and the distribution of stress field and displacement field in the mining process of double system coal seam are studied. The results show that the influence depth of Jurassic coal pillar is about 63 m, the horizontal influence area is 35 ~ 40 m, the maximum stress concentration factor is 3.14, the hard direct roof of coal seam in the coal seam of Carboniferous fully mechanized caving seam is unstable and the first fault step of the upper key layer is large, the influence depth of the coal pillar is about 63 m, and the maximum stress concentration factor is 3.14 m. And the instability of the main key layer leads to the goaf of the double system coal seam through, the roof structure of overlying rock expands gradually up, and the structure form is "the structure of the lower position combination cantilever beam structure-the upper multistory masonry beam structure". As the skeleton of overburden roof of Carboniferous coal seam, the structure plays a decisive role in the coal face pressure. Through theoretical analysis, the gradual extension range of roof structure is determined, the mechanical conditions and instability modes of the roof structure under different structural forms are analyzed, and the actual production conditions of 8101 face in Tongxin Coal Mine are combined. The measured results show that the first step distance of the hard roof in the working face is about 106m. The first step distance of upper subcritical layer is 133.5 m, and the interval of working face periodic pressure is about 17 m. The intensity of incoming pressure appears as a strong and weak periodic alternately, and the strong and weak periodic alternating pressure is consistent with the periodic breaking of the lower hard direct roof and the upper sub-key layer. The behavior of the rock pressure is consistent with the theoretical analysis of the instability of the "gradual spread structure". The results of the study are of guiding significance and theoretical value to the mining pressure behavior law and support selection of Carboniferous coal seam in Datong mining area.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD325

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