本文選題：覆巖關(guān)鍵層 + 采空區(qū)壓力　； 參考：《中國礦業(yè)大學》2017年碩士論文

【摘要】：煤炭開采引起的一系列采動損害與環(huán)境問題都與覆巖的內(nèi)部運動有關(guān)。而覆巖關(guān)鍵層破斷后會對采空區(qū)壓力產(chǎn)生最直接的影響。因此本文將結(jié)合關(guān)鍵層理論,研究采空區(qū)壓力變化規(guī)律與覆巖關(guān)鍵層破斷之間的對應關(guān)系,從而實現(xiàn)深入掌握覆巖內(nèi)部運動規(guī)律的目標。論文綜合運用理論分析、物理模擬、數(shù)值模擬以及現(xiàn)場實測等方法,首先通過物理模擬研究得到覆巖關(guān)鍵層破斷對采空區(qū)壓力變化規(guī)律影響的特征。運用數(shù)值模擬對影響采空區(qū)壓力變化規(guī)律的各因素進行了分析。最后采用自行研制的采空區(qū)壓力監(jiān)測系統(tǒng)進行了現(xiàn)場實測,初步得出了覆巖關(guān)鍵層破斷對采空區(qū)壓力變化影響的基本規(guī)律。物理模擬實驗表明,煤層開采后采空區(qū)的壓力隨著上覆關(guān)鍵層的破斷呈階梯狀增長。初采期時采空區(qū)壓力呈階梯狀增長直至最終穩(wěn)定,且采空區(qū)最終壓力值遠小于其原巖應力值。正常回采期時測點上方不同層位關(guān)鍵層破斷時采空區(qū)壓力呈階梯狀增長,而當上方主關(guān)鍵層破斷后,采空區(qū)壓力以不同斜率曲線恢復原巖應力的穩(wěn)定值。數(shù)值模擬實驗表明,無關(guān)鍵層條件下采空區(qū)壓力會以線性增長方式從零增加至最終穩(wěn)定值。覆巖存在關(guān)鍵層時,當測點布置在切眼附近時,采空區(qū)壓力始終隨關(guān)鍵層破斷呈階梯狀增長方式,壓力最終值會小于原巖應力值。當測點布置在正常回采階段時,采空區(qū)壓力變化情況會受到關(guān)鍵層層位、關(guān)鍵層厚度、采高等各因素的綜合影響。根據(jù)上述研究并結(jié)合采空區(qū)復雜的條件,運用自行研制的采空區(qū)壓力監(jiān)測系統(tǒng)及其工藝方法,在淄博王莊煤礦進行了現(xiàn)場實測,驗證了監(jiān)測系統(tǒng)的準確可行性以及采空區(qū)壓力變化的基本規(guī)律。
[Abstract]:A series of mining damage and environmental problems caused by coal mining are related to the internal movement of overburden. The key strata of overburden have the most direct effect on the pressure of goaf after breaking. Therefore, combining with the theory of critical layer, this paper will study the corresponding relationship between the law of pressure variation in goaf and the breaking of key strata of overburden, so as to realize the goal of mastering the law of motion inside overburden. In this paper, theoretical analysis, physical simulation, numerical simulation and field measurement are used to study the characteristics of the influence of the breakage of the key strata of overburden on the pressure variation in the goaf. The factors influencing the variation of goaf pressure are analyzed by numerical simulation. Finally, the field measurement is carried out by using the self-developed goaf pressure monitoring system, and the basic law of the influence of the breakage of the key strata of overburden on the pressure variation of the goaf is preliminarily obtained. The physical simulation results show that the pressure of the goaf increases with the breaking of the overlying key layer. During the first mining period, the pressure of goaf increases step by step until it is finally stable, and the final pressure of goaf is much less than the stress value of the original rock. In normal mining period, the pressure of goaf increases step by step when the key strata above the measuring point break, and the pressure of goaf recovers the stable value of the original rock stress with different slope curves after the main key layer is broken. The numerical simulation results show that the goaf pressure increases from zero to final stability in a linear way without critical layer. When there is a critical layer in overburden, when the measuring points are arranged near the cutting hole, the pressure of goaf always increases in step with the breakage of the critical layer, and the final value of pressure will be less than the stress value of the original rock. When the measuring points are arranged in the normal mining stage, the pressure changes in the goaf will be affected by the key layers, the thickness of the critical layer, the mining height and other factors. According to the above research and combined with the complicated conditions of goaf, using the self-developed goaf pressure monitoring system and its technological method, the field measurement was carried out in Wangzhuang Coal Mine, Zibo. The accurate feasibility of the monitoring system and the basic law of the pressure variation in the goaf are verified.
【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】：2017
【分類號】：TD325

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本文編號：1949288