發(fā)布時間：2018-05-02 13:26

  本文選題：斷層活化 + 采動影響　； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：原始地應(yīng)力的分布因斷層的存在導(dǎo)致了不連續(xù)及復(fù)雜狀態(tài),當(dāng)采掘工作面推進到斷層附近時,工作面超前支承壓力因斷層的存在也出現(xiàn)了明顯的不連續(xù)性。研究表明,正是由于應(yīng)力的不連續(xù)狀態(tài)導(dǎo)致斷層附近應(yīng)力與能量的積聚,而當(dāng)斷層活化時,大量能量在瞬間釋放,輕則引起斷層滑移破壞,重則導(dǎo)致整個頂板失衡垮落發(fā)生冒頂事故。斷層角度的不同也影響斷層附近應(yīng)力分布及斷層穩(wěn)定性,上/下盤開采的不同會對斷層附近應(yīng)力分布的擾動不同,正/逆斷層應(yīng)力分布差異及對采動的響應(yīng)也有差異,各因素影響程度各有不同。論文首先總結(jié)了常見的可能影響斷層活化規(guī)律的各種因素,重點分析工作面采動、正/逆斷層差異、上/下盤開采的不同、不同斷層角度四個因素的影響,對各因素影響下斷層活化的規(guī)律進行分析。其次借助FLAC3D模擬軟件,對不同斷層角度、正/逆斷層、上/下盤開采、工作面采動步距四個因素綜合作用下斷層活化規(guī)律進行模擬。數(shù)值模擬結(jié)果顯示斷層角度、正/逆斷層對斷層賦存穩(wěn)定性有顯著影響,斷層角度越大,斷層活化危險性越高,正斷層穩(wěn)定性小于逆斷層;上盤開采對斷層穩(wěn)定性的破壞更大,下盤開采時巖層變形更大;工作面距離斷層越近,斷層活化危險性越大,斷層穩(wěn)定性越低,工作面過斷層對斷層穩(wěn)定性的破壞非常大,應(yīng)避免斷層附近的工作面開采;高角度正斷層上盤開采對斷層的破壞最大,斷層滑移危險性也最大;斷層角度對斷層活化危險性的影響最大,工作面布置方式次之,正逆斷層的影響最小。
[Abstract]:The distribution of original ground stress causes discontinuity and complexity due to the existence of faults. When the mining face advances to the vicinity of the fault, the leading supporting pressure of the working face also appears obvious discontinuity due to the existence of the fault. The results show that it is the discontinuous state of stress that leads to the accumulation of stress and energy near the fault, and when the fault is activated, a large amount of energy is released in an instant, which causes the slip failure of the fault. Heavy causes the whole roof unbalance to collapse to produce the roof to fall the accident. The difference of fault angle also affects the stress distribution and fault stability near the fault, and the disturbance of stress distribution in the upper / lower face mining is different, and the difference of the stress distribution and the response to the mining movement are also different. The degree of influence varies from factor to factor. At first, the paper summarizes the common factors which may affect the law of fault activation, and analyzes the influence of four factors, such as mining movement, difference of positive / reverse fault, different mining of upper / lower face, different fault angle, etc. The law of fault activation under the influence of various factors is analyzed. Secondly, with the help of FLAC3D simulation software, this paper simulates the law of fault activation under the combined action of four factors: different fault angle, normal / reverse fault, upper / lower plate mining, and working face mining step distance. The numerical simulation results show that the normal / reverse fault has a significant effect on the fault occurrence stability. The greater the fault angle, the higher the risk of fault activation, and the lower the normal fault stability is than the reverse fault. The closer the face is to the fault, the greater the risk of fault activation is, the lower the fault stability is, the greater the damage to the fault stability is when the face passes through the fault, and the mining face near the fault should be avoided. Mining of upper face of high angle normal fault has the greatest damage to fault and fault slip risk is also the biggest, fault angle has the greatest influence on fault activation risk, working face layout is the second, and positive thrust fault is the least.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD32;TD163.1

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本文編號：1834114