本文選題：斷層防水煤柱 + 力學(xué)測試�。� 參考：《安徽建筑大學(xué)》2017年碩士論文

【摘要】：斷層防水煤柱的合理留設(shè)關(guān)系到礦井安全生產(chǎn)與煤炭資源的采出率,若留設(shè)的斷層防水煤柱既能保證礦井的安全生產(chǎn)又能最大限度的開采煤炭資源,正是秉承了“以人為本、科技興礦,安全高效和減少資源損失、走可持續(xù)發(fā)展”社會(huì)宗旨和理念。至今留設(shè)斷層防水煤柱的方法也是層不窮出,但因斷層的賦存條件千差萬別,所以針對(duì)不同的工程背景要根據(jù)其具體的賦存條件選用多種方法進(jìn)行研究。論文以昌恒煤礦的9102工作面外側(cè)F1斷層為研究對(duì)象,首先,為明確F1斷層帶的力學(xué)及水理性質(zhì),在9102工作面風(fēng)巷靠近斷層處施工頂1、頂2、底1、底2四個(gè)鉆孔并取巖樣,對(duì)巖樣做巖石力學(xué)與水理性質(zhì)測試,水理性質(zhì)測試包括含水率、吸水率、滲透性、膨脹性與耐崩解性,結(jié)果表明:F1斷層的巖樣構(gòu)成復(fù)雜,是斷層角礫巖、斷層泥、糜棱狀巖石的混雜堆積,并具有“松、散、軟、弱”的特點(diǎn);平均含水率2.53%;平均滲透系數(shù)為0.35cm/s,屬于“強(qiáng)透水性”類型巖土;平均膨脹率為0.656%;軟巖中多半樣品十分破碎,遇水即崩解,而且速度較快;大部分巖石穩(wěn)定性不好,浸水泥化程度較高,屬于不穩(wěn)定、極不穩(wěn)定巖石。其次,采用FLAC~(3D)軟件模擬的方法模擬研究不同工作面推進(jìn)距離時(shí)采空區(qū)圍巖與斷層的采動(dòng)應(yīng)力變化、位移變化及塑性區(qū)的變化,結(jié)果表明:采空區(qū)圍巖與斷層的采動(dòng)壓力、位移量、塑性區(qū)范圍均隨采空區(qū)范圍的增大而增大,另工作面中部剖切面上的采動(dòng)礦壓、位移量、塑性區(qū)范圍均比工作面端部的值要大,即留設(shè)斷層防水煤柱時(shí)應(yīng)根據(jù)工作面中部剖切面上的破壞范圍留設(shè)。采動(dòng)工作面推進(jìn)140m時(shí),工作面底板破壞深度為19m,斷層帶內(nèi)出現(xiàn)小區(qū)域的塑性破壞區(qū),底板的塑性破壞區(qū)沒有波及至斷層帶,斷層上下盤的界面位移差為0.005dm,斷層沒有發(fā)生活化,預(yù)留設(shè)45m的斷層防水煤柱。再次,采用煤柱彈塑性分區(qū)法計(jì)算留設(shè)的斷層防水煤柱的寬度,煤柱彈塑性分區(qū)法運(yùn)用彈塑性極限平衡理論、材料力學(xué)理論及斷層兩盤的巖性分別計(jì)算煤柱極限平衡區(qū)、彈性區(qū)與斷層影響帶的寬度,計(jì)算得煤柱極限平衡區(qū)寬度為14.27m,彈性區(qū)寬度為28.23m,斷層影響帶寬度為6.88m,三者之和為49.38m。為保證工作面的安全開采,F1斷層防水煤柱的合理寬度取50m。
[Abstract]:The reasonable setting of fault waterproof coal pillar is related to mine safety production and mining rate of coal resources. If the fault waterproof coal pillar can not only guarantee the safety of mine production but also maximize the exploitation of coal resources, it is precisely the "people-oriented" policy. Science and technology, safe and efficient, reduce the loss of resources, sustainable development "social purpose and concept." Up to now, the method of keeping fault waterproof coal pillar is not out of bed, but because the occurrence condition of fault is very different, it is necessary to select many methods according to its specific occurrence condition to study different engineering background. This paper takes the F1 fault outside the 9102 face of Changheng Coal Mine as the research object. Firstly, in order to clarify the mechanical and hydrological properties of F1 fault zone, four boreholes are constructed near the fault in the wind roadway of 9102 working face, namely, the top 1, the top 2, the bottom 1 and the bottom 2, and the rock samples are taken. The rock samples are tested for rock mechanics and hydrological properties, which include water content, water absorption, permeability, expansibility and collapse resistance. The results show that the rock samples of the W F 1 fault are complicated, they are fault breccia, fault gouge. The mixed accumulation of mylonitic rocks with the characteristics of "loose, soft and weak"; the average moisture content is 2.53; the average permeability coefficient is 0.35 cm / s, which belongs to the "strong permeability" type of rock and soil; the average expansion rate is 0.656; and most of the samples in the soft rock are very broken, Most rocks are unstable and unstable because of their poor stability and high degree of cement leaching. Secondly, the dynamic stress, displacement and plastic zone of surrounding rock and fault in goaf are simulated by using the software FLACY 3D. The results show that the mining pressure of wall rock and fault in goaf is analyzed. The range of displacement and plastic zone increases with the increase of goaf, and the range of mining pressure, displacement and plastic zone in the middle of the face is larger than that at the end of the face. The fault waterproof coal pillar should be set according to the damage range of the middle face. When the mining face is advancing 140 m, the floor failure depth of the working face is 19 m, the plastic failure zone of small area appears in the fault zone, the plastic failure area of the bottom plate does not spread to the fault zone, the displacement difference between the upper and lower face of the fault is 0.005 dm, and the fault is not activated. A 45 m fault waterproof coal pillar is reserved. Thirdly, the width of the remaining fault waterproof coal pillar is calculated by the elastoplastic partition method of coal pillar, and the limit equilibrium zone of coal pillar is calculated by the elastoplastic limit equilibrium theory, the theory of material mechanics and the lithology of the two plates of the fault. The width of elastic zone and fault-affected zone is calculated, the width of limit equilibrium zone of coal pillar is 14.27 m, the width of elastic zone is 28.23 m, the width of influence zone of fault is 6.88 m, the sum of the three is 49.38 m. In order to ensure the safe mining of working face, the reasonable width of F1 fault waterproof pillar is 50 m.
【學(xué)位授予單位】：安徽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD745;TD822.3

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