金凤煤矿大采高工作面沿空留巷应用研究

发布时间：2018-10-21 08:35

【摘要】：金凤煤矿011802综采工作面为一采区首采工作面,平均煤层厚度4.2m,煤层倾向6°,走向5~14°,平均埋深180m。由于接续工作面走向长度较长,两巷掘进过程中断层、地质构造带多,很难保证正常掘进速度。为确保新建矿井采掘正常接续及原煤生产产量,并尽快实现达产,结合金凤煤矿地质及开采条件,决定在首采工作面实施沿空留巷。但是,我国大采高工作面在日均推采8m、留巷巷宽5m条件下成功进行沿空留巷的工程实例较少,尚无成熟经验借鉴,为此开展金凤煤矿大采高工作面沿空留巷应用研究。本论文采用理论分析及计算、数值模拟及工业性试验相结合的方法,对矿井地质条件及沿空留巷工作面开采条件进行了梳理,在分析围岩活动及变形规律的基础上,总结了大采高工作面沿空留巷的支护特点;采用“分离岩块法”进行理论计算并结合前述支护特点进行了大采高工作面沿空留巷相关支护设计,基于上述分析及设计,进行了工业性试验。金凤煤矿011802综采工作面回风巷采用柔模混凝土支护技术进行沿空留巷,针对回采工作面推进速度快、巷旁日均混凝土充填量大的特点,采用柔模混凝土制备输送机组成套设备进行沿空留巷施工,并成功留巷610m,留巷巷道作为011801综采工作面运输巷使用。巷道稳定后,顶板最大下沉量240mm,两帮最大移近量95mm,所留巷道断面保持在13m2以上。留巷达到预期效果,满足后续生产需要。011802综采工作面实施沿空留巷后,少掘巷道产生的经济效益为73.2万元,回收煤柱产生的经济效益为1148万元。截至目前该技术已在金凤煤矿十八煤后续三个工作面推广,为类似地质及开采条件矿井开展沿空留巷提供了技术途径及借鉴经验。
[Abstract]:The 011802 fully mechanized mining face of Jinfeng Coal Mine is the first mining face in a mining area, with an average thickness of 4.2 m, a tendency of 6 掳, a strike of 5 掳and an average depth of 180 m. Due to the long strike length of the connecting face and the faults and many geological structural zones during the driving process of the two roadways, it is difficult to guarantee the normal tunneling speed. In order to ensure the normal continuity of mining and the production of raw coal, and realize the production of raw coal as soon as possible, combined with the geology and mining conditions of Jinfeng coal mine, it is decided to carry out the gob-side roadway in the first mining face. However, the large mining face in our country has been pushed 8 ma per day, and the engineering examples of retaining roadway along the gob under the condition of 5 m wide of roadway are few, and there is no mature experience for reference. Therefore, the research on the application of high mining face along goaf in Jinfeng coal mine is carried out. In this paper, the method of theoretical analysis and calculation, numerical simulation and industrial test are used to sort out the geological conditions of the mine and the mining conditions along the goaf roadway, and on the basis of analyzing the movement and deformation of surrounding rock. This paper summarizes the supporting characteristics of gob retaining roadway in large mining face, carries out theoretical calculation by using "separating rock block method" and carries on the related support design along gob retaining roadway in large mining face with the above-mentioned characteristics, based on the above analysis and design, Industrial tests were carried out. In 011802 fully mechanized coal mining face of Jinfeng Coal Mine, flexible concrete supporting technology is used to keep the roadway along the goaf. Aiming at the characteristics of fast speed of advance and large amount of daily concrete filling beside the roadway, A complete set of equipment for preparing conveyer group of flexible formwork concrete was used to construct the roadway along the goaf, and 610m was successfully retained, and the roadway was used as the transportation roadway of 011801 fully mechanized mining face. After the roadway is stabilized, the maximum subsidence of roof is 240 mm, the maximum movement of two sides is 95 mm, and the section of roadway remains above 13m2. After the 011802 fully mechanized mining face was implemented along the goaf, the economic benefit of less roadway excavation was 732000 yuan, and the economic benefit of recovering coal pillar was 11.48 million yuan. Up to now, the technology has been popularized in the following three working faces of 18 coal in Jinfeng coal mine, which provides a technical way and experience for similar geological and mining conditions to carry out gob-side roadway.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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