【摘要】：經(jīng)過多年的發(fā)展,我國煤礦綜采比例有很大增長,合理的綜采工作面推進速率是實現(xiàn)礦井安全、高效生產(chǎn)的關鍵,工作面推進速率與礦壓顯現(xiàn)之間關系的相關理論有待進一步開展研究。論文綜合采用了理論分析、數(shù)值模擬、相似實驗和現(xiàn)場觀測的研究方法和手段,總結了影響工作面推進速率的主要影響因素,對工作面不同推進速率下的塑性區(qū)、應力場、位移場進行了數(shù)值模擬研究,對工作面不同推進速率的影響下上覆巖層垮落、位移特征以及工作面前方煤體應力分布規(guī)律進行了相似實驗研究,并進一步通過現(xiàn)場實測進行了驗證,主要得到了以下結論:1)總結了影響工作面推進速率的主要影響因素。通過層次分析法計算,自燃發(fā)火、瓦斯排放、采煤機性能、刮板輸送機性能、礦山壓力顯現(xiàn)和頂板活動的影響權重分別為0.11、0.17、0.10、0.10、0.26和0.24,可見礦山壓力顯現(xiàn)對楊伙盤礦20105綜采工作面推進速率的影響權重是最大的。2)模擬研究了工作面不同推進速率下的塑性區(qū)、應力場、位移場。隨著工作面推進速率的加快,工作面前方的垂直應力不斷向煤壁靠近,且應力集中系數(shù)增大,應力降低區(qū)域減小;工作面前方煤體的塑性破壞區(qū)范圍隨著工作面推進速率的降低而不斷向深部擴展,推進速率過慢,煤壁的水平位移變大,加快推進速率對防止工作面片幫、控頂都有積極作用。3)實驗研究了工作面不同推進速率的影響下上覆巖層垮落、位移特征以及工作面前方煤體應力分布規(guī)律。工作面推進速率加快,對周期來壓步距影響相對較小,對來壓影響范圍影響較大,支承壓力的峰值會增大且會更接近工作面,工作面上方的高應力區(qū)范圍增加,導致工作面發(fā)生頂板突發(fā)性垮落的概率增大,過高的彈性能聚集可能誘發(fā)巖爆等動力災害的產(chǎn)生。4)完成了楊伙盤礦20105綜采工作面的現(xiàn)場實測分析。得到了工作面不同推進速率下支架工作阻力曲線,發(fā)現(xiàn)工作面速度加快后,對周期來壓步距影響較小,但是對來壓持續(xù)長度影響較大,進一步驗證了前文實驗研究成果。工作面頂板周期來壓時,頂板斷裂、地表塌陷,頂板里的賦存水會全部侵入到工作面。來壓時工作面要組織快速推進,避免長時間停留。
[Abstract]:After many years of development, the proportion of fully mechanized coal mining in China has greatly increased, and a reasonable advancing rate of fully mechanized mining face is the key to realizing mine safety and high efficiency production. The theory of the relationship between working face propelling rate and mine pressure behavior needs to be further studied. In this paper, theoretical analysis, numerical simulation, similarity experiment and field observation are adopted to summarize the main influencing factors of working face propulsion rate, and to the plastic zone and stress field of the working face under different propulsion rates. The numerical simulation of displacement field is carried out, and similar experiments are carried out to study the overlying strata collapse, displacement characteristics and stress distribution in front of the working surface under the influence of different advancing rates of the working face. The main conclusions are as follows: 1) the main influencing factors of working face propulsion rate are summarized. The influence weights of spontaneous combustion, gas discharge, shearer performance, scraper conveyor performance, mine pressure behavior and roof activity are 0.11,0.17,0.10,0.10,0.26 and 0.24,respectively, calculated by analytic hierarchy process (AHP). It can be seen that the influence weight of mine pressure behavior on the propulsion rate of 20105 fully mechanized mining face in Yanghuopan Mine is the largest. 2) the plastic zone, stress field and displacement field of the working face under different propulsion rates are simulated and studied. With the speed up of the working face, the vertical stress in front of the working surface approaches to the coal wall, and the stress concentration coefficient increases and the stress reduction area decreases. The plastic failure zone of the coal body in front of the working face expands to the deep with the reduction of the working face propulsion rate, the propulsion rate is too slow, the horizontal displacement of the coal wall becomes larger, and the acceleration of the propulsion rate prevents the working surface strip from being helped. The roof control has a positive effect. 3) the overlying strata collapse, displacement characteristics and stress distribution law in front of the working surface are studied experimentally under the influence of different advancing speed of the working face. The driving speed of the working face is quickened, the influence on the periodic pressure step distance is relatively small, the influence range of the coming pressure is greater, the peak value of the supporting pressure will increase and will be closer to the working face, and the range of the high stress area above the working face will increase. The probability of roof sudden collapse in working face is increased, and high elastic performance aggregation may induce rock burst and other dynamic disasters. 4) the field measurement and analysis of 20105 fully mechanized mining face in Yanghuopan Mine have been completed. The working resistance curves of the support under different propulsion rates are obtained. It is found that the working resistance curves of the support under different driving rates show that the speed of the working face has little effect on the periodic pressure step distance, but the influence on the continuous length of the pressure is greater, which further validates the results of the experimental research in the previous paper. When the roof is periodically pressed, the roof breaks, the surface collapses, and the water stored in the roof will all invade the working face. To press the face to organize rapid progress, avoid a long stay.
【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】：2015
【分類號】：TD323

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