發(fā)布時(shí)間：2018-11-12 13:22

【摘要】：由于新嶺煤礦早期采用巷采等落后的采煤工藝,遺留了大量的殘煤資源。近年來隨著新嶺煤礦剩余儲(chǔ)量逐漸較少,煤炭產(chǎn)能不斷下降,殘煤回收成為煤炭生產(chǎn)的主要任務(wù)。但由于殘煤復(fù)采工作面原始煤層遭到破壞,工作面存有大量老巷和煤柱,使得工作面開采條件復(fù)雜,面臨著老巷對(duì)頂板穩(wěn)定性、礦壓顯現(xiàn)規(guī)律、煤巖穩(wěn)定性的影響及工作面支護(hù)等諸多技術(shù)問題需要解決。本文以新嶺煤礦殘煤復(fù)采工作面地質(zhì)條件為基礎(chǔ),采用理論分析、相似模擬、數(shù)值模擬及現(xiàn)場(chǎng)實(shí)測(cè)等方法對(duì)殘采工作面的支柱工作阻力及工作面煤巖的穩(wěn)定性進(jìn)行了分析。通過理論計(jì)算得出了支柱的合理支護(hù)阻力及煤柱的失效寬度;通過相似模擬實(shí)驗(yàn)研究了工作面前方有老巷時(shí)的煤巖體破壞規(guī)律及礦壓顯現(xiàn)規(guī)律;通過udec數(shù)值模擬軟件分析了不同的采放比及不同的老巷間距對(duì)殘采工作面礦壓顯現(xiàn)和煤巖穩(wěn)定性的影響;通過現(xiàn)場(chǎng)實(shí)測(cè),研究分析了工作面超前支承壓力的分布規(guī)律、頂煤的運(yùn)移規(guī)律及單體液壓支柱的適應(yīng)性。研究分析得出工作面合理的支護(hù)阻力為552k N/m2,煤柱的失效寬度為1.92m;老巷造成工作面片幫冒頂嚴(yán)重;工作面采放比采用1:2時(shí),可以有效減弱工作面的礦壓顯現(xiàn),有利于提高煤巖的穩(wěn)定性;工作面在不同的老巷間距下煤巖體有不同的破壞特征;現(xiàn)場(chǎng)實(shí)測(cè)總得出超前支承應(yīng)力影響范圍約為30m,峰值約3.13MPa,工作面上方的冒空是導(dǎo)致支柱工作阻力偏小的主要原因。
[Abstract]:Because of the backward mining technology such as roadway mining in early stage, Xinling coal mine left a large amount of residual coal resources. In recent years, as the remaining reserves of Xinling Coal Mine are gradually less and the coal production capacity is declining, the recovery of residual coal has become the main task of coal production. However, due to the destruction of the original coal seam and the existence of a large number of old roadways and pillars in the working face, the mining conditions of the working face are complicated, and it is faced with the stability of the old roadway to the roof and the regularity of the rock pressure appearance. The influence of the stability of coal and rock and the support of working face and many other technical problems need to be solved. Based on the geological conditions of the residual coal mining face in Xinling Coal Mine, this paper analyzes the working resistance of the pillar and the stability of the coal and rock in the residual mining face by means of theoretical analysis, similarity simulation, numerical simulation and field measurement. The reasonable support resistance and the failure width of coal pillar are obtained by theoretical calculation, and the failure law of coal and rock mass and the law of rock pressure are studied by similar simulation experiment. Through udec numerical simulation software, the influence of different mining / drawing ratio and different old roadway spacing on mine pressure behavior and coal rock stability of residual mining face is analyzed. Through the field measurement, the distribution law of the leading support pressure, the movement law of the top coal and the adaptability of the single hydraulic prop are studied and analyzed. The reasonable support resistance is 552 K N / m 2 and the failure width of coal pillar is 1.92 m. When the mining caving ratio is adopted at 1:2, it can effectively weaken the appearance of coal pressure in the working face, which is helpful to improve the stability of coal and rock, and the coal and rock mass have different failure characteristics under different old roadway spacing. The results show that the influence range of the leading support stress is about 30 m and the peak value is about 3.13 MPA. The caving above the working face is the main reason leading to the low working resistance of the pillar.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD823.253

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