【摘要】：厚煤層大采高工作面頂板下沉空間大,煤體承擔(dān)載荷較高,同時(shí)受大采高開采工藝影響,片幫事故多發(fā),嚴(yán)重影響井下安全高效生產(chǎn)。論文針對(duì)厚煤層片幫機(jī)理進(jìn)行研究,解決大采高液壓支架片幫控制問(wèn)題,對(duì)厚煤層安全高效生產(chǎn)具有一定的工程應(yīng)用價(jià)值。論文首先根據(jù)厚煤層工作面實(shí)際工況條件,使用UDEC建立數(shù)值模型,分析厚煤層工作面頂板運(yùn)動(dòng)破壞規(guī)律;通過(guò)FLAC3D模擬分析頂板巖層結(jié)構(gòu)對(duì)煤壁穩(wěn)定性的影響,同時(shí)建立厚煤層圍巖耦合模型,分析不同裂斷步距造成應(yīng)力變化情況,以確定煤體穩(wěn)定受圍巖運(yùn)動(dòng)影響變化特征;依據(jù)厚煤層頂板運(yùn)動(dòng)破壞規(guī)律,明確支護(hù)強(qiáng)度,基于該強(qiáng)度范圍提出大采高液壓支架主要部件設(shè)計(jì)要求并提出改進(jìn)措施,通過(guò)頂板支護(hù)實(shí)現(xiàn)片幫控制;同時(shí)論文通過(guò)開采工藝對(duì)煤壁穩(wěn)定性影響,進(jìn)行大采高液壓支架對(duì)工作面推進(jìn)速度、順槽布置、開采截深的適應(yīng)性分析,并基于不同開采工藝提出片幫控制措施;分析干擾變量,結(jié)合FLAC3D模擬確定厚煤層煤壁最佳護(hù)幫長(zhǎng)度,明確大采高液壓支架護(hù)幫機(jī)構(gòu)主要參數(shù),并提出改進(jìn)方案,基于煤壁護(hù)幫實(shí)現(xiàn)片幫控制。論文通過(guò)厚煤層片幫機(jī)理研究,確定最佳支護(hù)強(qiáng)度,優(yōu)化其頂板支護(hù)能力,降低煤體承擔(dān)載荷;結(jié)合大采高開采工藝與煤壁片幫影響關(guān)系,進(jìn)行大采高液壓支架適應(yīng)性分析,優(yōu)化液壓支架在不同開采工藝下防片幫能力;根據(jù)煤體應(yīng)力變化特征提出護(hù)幫板等關(guān)鍵部件設(shè)計(jì)及尺寸要求,論文研究有助于提高大采高液壓支架防片幫能力,對(duì)生產(chǎn)現(xiàn)場(chǎng)具有一定指導(dǎo)作用。
[Abstract]:The roof subsidence space of large mining face in thick coal seam is large, the load of coal body is high, and at the same time, influenced by mining technology of large mining height, the accidents of sheet side are frequent, which seriously affects the safety and efficiency of underground production. In this paper, the mechanism of thick coal seam cover is studied to solve the control problem of hydraulic support for large mining height, which has certain engineering application value for safe and efficient production of thick coal seam. Firstly, according to the actual working conditions of thick coal seam working face, UDEC is used to establish a numerical model to analyze the rule of roof motion failure in thick coal seam working face. The influence of roof rock structure on the stability of coal wall is analyzed by FLAC3D simulation. At the same time, the coupling model of surrounding rock in thick coal seam is established, and the stress change caused by different crack step distance is analyzed to determine the change characteristics of coal stability affected by surrounding rock movement. According to the rule of roof motion and failure in thick coal seam, the support strength is defined. Based on the strength range, the design requirements of main components of hydraulic support with large mining height are put forward, and the improvement measures are put forward. At the same time, through the influence of mining technology on the stability of coal wall, the paper analyzes the adaptability of the hydraulic support with large mining height to the speed of working face, the arrangement of trench, the depth of mining, and puts forward the control measures of sheet cover based on different mining technology. Based on the analysis of interference variables and FLAC3D simulation to determine the best length of coal wall in thick coal seam, the main parameters of hydraulic support caving mechanism with large mining height are determined, and an improved scheme is put forward, which is based on coal wall protection to realize slab control. By studying the mechanism of thick coal seam, this paper determines the best supporting strength, optimizes its roof support ability, and reduces the load of coal body. According to the relation between the mining technology of high mining height and the influence of coal wall blade cover, the adaptability analysis of large mining height hydraulic support is carried out, and the ability of preventing sheet cover under different mining technology is optimized. According to the characteristics of stress variation of coal body, the design and size requirements of key components such as bevel plate are put forward. The research in this paper is helpful to improve the ability of preventing flake cover of hydraulic support with large mining height and has a certain guiding effect on production site.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD355.4

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