综采工作面推进速率与矿压显现关系的研究
发布时间：2019-04-02 18:31
【摘要】：经过多年的发展,我国煤矿综采比例有很大增长,合理的综采工作面推进速率是实现矿井安全、高效生产的关键,工作面推进速率与矿压显现之间关系的相关理论有待进一步开展研究。论文综合采用了理论分析、数值模拟、相似实验和现场观测的研究方法和手段,总结了影响工作面推进速率的主要影响因素,对工作面不同推进速率下的塑性区、应力场、位移场进行了数值模拟研究,对工作面不同推进速率的影响下上覆岩层垮落、位移特征以及工作面前方煤体应力分布规律进行了相似实验研究,并进一步通过现场实测进行了验证,主要得到了以下结论:1)总结了影响工作面推进速率的主要影响因素。通过层次分析法计算,自燃发火、瓦斯排放、采煤机性能、刮板输送机性能、矿山压力显现和顶板活动的影响权重分别为0.11、0.17、0.10、0.10、0.26和0.24,可见矿山压力显现对杨伙盘矿20105综采工作面推进速率的影响权重是最大的。2)模拟研究了工作面不同推进速率下的塑性区、应力场、位移场。随着工作面推进速率的加快,工作面前方的垂直应力不断向煤壁靠近,且应力集中系数增大,应力降低区域减小;工作面前方煤体的塑性破坏区范围随着工作面推进速率的降低而不断向深部扩展,推进速率过慢,煤壁的水平位移变大,加快推进速率对防止工作面片帮、控顶都有积极作用。3)实验研究了工作面不同推进速率的影响下上覆岩层垮落、位移特征以及工作面前方煤体应力分布规律。工作面推进速率加快,对周期来压步距影响相对较小,对来压影响范围影响较大,支承压力的峰值会增大且会更接近工作面,工作面上方的高应力区范围增加,导致工作面发生顶板突发性垮落的概率增大,过高的弹性能聚集可能诱发岩爆等动力灾害的产生。4)完成了杨伙盘矿20105综采工作面的现场实测分析。得到了工作面不同推进速率下支架工作阻力曲线,发现工作面速度加快后,对周期来压步距影响较小,但是对来压持续长度影响较大,进一步验证了前文实验研究成果。工作面顶板周期来压时,顶板断裂、地表塌陷,顶板里的赋存水会全部侵入到工作面。来压时工作面要组织快速推进,避免长时间停留。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323
本文编号：2452802
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323
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