【摘要】：雖然我國(guó)煤炭行業(yè)還沒有脫離寒冬期,但是作為每年消費(fèi)量超過35億噸煤炭的我國(guó)來說,不管是現(xiàn)在還是未來幾十年,依然不會(huì)有撼動(dòng)煤炭地位的新能源出現(xiàn)。所以研究煤炭開采新技術(shù),提高煤炭開采的安全性,依然是擺在我國(guó)煤炭科技工作者面前的重要課題。堅(jiān)硬石灰?guī)r頂板在邯邢礦區(qū)發(fā)育較多,該類型頂板具有垮落步距大、來壓顯現(xiàn)強(qiáng)烈,并伴隨有一定程度的沖擊地壓等特點(diǎn),而且頂板的含水量也較大,對(duì)采煤工作面的安全生產(chǎn)造成一定的威脅。所以查明堅(jiān)硬頂板的運(yùn)動(dòng)形式及運(yùn)動(dòng)規(guī)律,對(duì)指導(dǎo)井下生產(chǎn)、提高作業(yè)安全性具有很大的意義。本文以冀中能源峰峰礦業(yè)集團(tuán)萬年礦9#煤層的首采面13902工作面為實(shí)例,通過理論計(jì)算、分析井下支架壓力數(shù)據(jù)和離散元(UDEC)數(shù)值模擬技術(shù),確定了萬年礦9#煤層老頂大青灰?guī)r的運(yùn)動(dòng)形式及礦壓規(guī)律,為該層煤以后的開采工作提供了有力的技術(shù)支持。通過分析得出以下結(jié)論:1.經(jīng)過理論計(jì)算和結(jié)合工作面實(shí)際情況,得出大青灰?guī)r老頂作來壓屬于不明顯級(jí)別;2.老頂初次來壓步距為40m,周期來壓步距25m;3.老頂周期來壓強(qiáng)度能達(dá)到3500-4000KN,接近或超過支架安全閥開啟值的3700KN,因此造成安全閥開啟頻繁,從此可以看出該工作面支架選取存在不合理之處;4.文章分析了老頂壓力持續(xù)較大的原因,主要在于老頂巖塊斷裂后緊密結(jié)合而不垮落,前后巖塊之間存在較大向下方向的摩擦力。
[Abstract]:Although China's coal industry has not been out of the cold winter period, as the annual consumption of more than 3.5 billion tons of coal in China, no matter now or in the next few decades, there will still be no new energy to shake the status of coal. Therefore, the study of new coal mining technology to improve the safety of coal mining is still an important task for our coal science and technology workers. The hard limestone roof is more developed in Hanxing mining area. The roof of this type has the characteristics of large collapse step distance, strong coming pressure, and accompanied by a certain degree of impact ground pressure, and the water content of the roof is also large. It poses a certain threat to the safety production of coal mining face. So it is of great significance to find out the movement form and law of hard roof to guide underground production and improve the safety of work. In this paper, taking the first mining face 13902 face of 9# Coal seam in Wannian Coal Mine of Jizhong Energy Fengfeng Mining Group as an example, through theoretical calculation, the pressure data of underground support and the numerical simulation technology of discrete element (UDEC) are analyzed. The movement form and rock pressure law of Daqing limestone in the old roof of 9# coal seam in Wannian Coal Mine are determined, which provides a strong technical support for the mining work after the seam. The following conclusion is drawn from the analysis: 1. Through theoretical calculation and combined with the actual situation of the working face, it is concluded that the old roof pressure of Daqing limestone belongs to the unobvious grade 2. The first step distance of the main roof is 40 m, and the periodic pressure step distance is 25 m ~ 3. The pressure intensity of the main roof cycle can reach 3500-4000KN, which approaches or exceeds 3700KN of the open value of the support safety valve, which causes the safety valve to open frequently. From this, it can be seen that the selection of the support in the working face is unreasonable. This paper analyzes the reasons for the persistence of the roof pressure, which mainly lies in the tight combination of the main roof rock blocks after fracture without collapse, and the large downward friction between the front and back rock blocks.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD327

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本文編號(hào)：2123270