【作者】 范文胜；

【导师】 张飞；

【作者基本信息】 内蒙古科技大学 ， 采矿工程， 2010， 硕士

【摘要】 本课题为内蒙古科技大学矿业工程学院与神华集团海勃湾矿业公司合作研究的项目。由于路天矿现有开采储量有限,若按照原来短工作面布置方式,留设区段保护煤柱太多,煤炭资源损失较大。为进一步提高工作面的单产水平,减少工作面搬家次数,降低开采成本,减少资源损失,把工作面加长到300m开采,但顶板管理难度增大,矿压显现规律有别于普通工作面。本文通过计算机数值模拟研究和现场实测对厚煤层综采放顶煤工作面矿压显现规律以及围岩应力分布规律进行了深入研究。得出了综放工作面顶煤板矿压显现规律、顶煤板运移规律、围岩应力分布规律、巷道变形规律以及相邻工作面之间留设合理宽度的保护煤柱。得到1604超长工作面直接顶初次来压步距18m～22m,老顶初次来压步距27m～30m,老顶周期来压步距9m～12m。工作面加长以后,老顶来压显现呈现出工作面中间段超前、工作面靠近两端头滞后的特征。当工作面推进30m左右时,煤壁出现片帮,认为加快工作面的推进速度和提高工作面支架阻力是防治冒顶事故和降低煤壁片帮的有效手段。工作面两端头上方7m左右的地方形成一个应力集中区,应力大小4～5Mpa,这是因为工作面加长以后顶板的破断由原来的竖“X”破断变为横“X”破断,顶板首先在工作面的推进方向上破断,破断后就像一条“横梁”搭在工作面两侧的保护煤柱上形成应力集中的现象。应力大小没有达到煤柱的极限载荷,所以不影响生产。分析得出路天矿1604超长工作面和下一个工作面之间留设保护煤柱的尺寸应为9～10m。该研究成果为超长综放面矿压控制设计、支架的选型和保护煤柱合理的尺寸优化提供了理论依据,对提高综放工作面煤炭回收率有重要的现实意义,为其他类似条件下的综放面提供了有益的借鉴,有较高的应用价值。更多还原

【Abstract】 The topic is co-operative research projects of College of Resources and Security of Inner mongolia university of science and technology and Wuhai Shenhua energy company.Due to the existing open pit mining reserves are limited,if the original layout, leaving in so many section of the coal pillar, loss of coal resources are greater.To further enhance the yield level of face, reduce moving times of face,reduce mining costs, reduce loss of resources, the mining face lengthened to 300m,but the management of roof is difficult, rockburst behavior is different from the general face.In this paper, through theoretical analysis, computer numerical simulation research methods and field measurement to conduct in-depth study of the thick coal seam caving face stress distribution of surrounding rock and regularity of mine pressure of thick coal fully mechanized caving face.The result is that get the law of top roof to pressure, movement laws of top-coal and roof, deformation laws of gates surrounding rock and the width of a reasonable size of the coal pillar for adjacent face. Get step away from the initial pressure of Immediate roof of 1604 long face is 18m～22m,step away from the initial pressure of roof is 27m～30m, step away from the periodic pressure of roof is 9m～12m.When the face is lengthened, roof pressure appear showing a face in the middle is lead,near both ends of the face is lag. When the face advanced 30m, coal wall spalling occurred, the effective method of controlling coal wall spalling and roof fall accident prevention is accelerating advance speed and Improving setting load of support.About 7m high of both ends of the face,there is stress concentration zone,stress is 4～5Mpa, this is because when the face is lengthened, roof breaking by the original vertical "X" breaking into a horizontal "X" breaking,roof first breaking happened in the advancing direction of the face,when the roof breaking,it is liking a beam pressed on the protection pillar,the formation of stress concentration. Stress does not meet the size limit of coal pillar load, so does not affect production. Analysis obtained the size of protective pillar section of 1604 face is 9m～10m.The results provide a theoretical basis for rock pressure and strata control and the width of a reasonable size of the coal pillar and contribute to further study top-coal caving in fully mechanized top-coal caving face. The results also benefit to improve the recovery of coal in fully mechanized caving face. At the same time it provides beneficial lessons for other similar fully mechanized long wall top-coal caving mining. Having a higher application value in this paper.更多还原