【摘要】：由于淮南潘謝礦區(qū)煤炭資源的緊張形勢,因此開發(fā)潘謝礦區(qū)的A組煤具有重要意義。本文針對淮南礦區(qū)潘二煤礦11223工作面地質(zhì)條件,理論分析了大采高工作面破碎頂板冒落的力學(xué)機理和破碎頂板的注漿加固機理。數(shù)值模擬和現(xiàn)場實測相結(jié)合的方法,對大采高工作面薄層松軟破碎頂板穩(wěn)定性及控制技術(shù)進行研究。 運用FLAC3D數(shù)值模擬軟件建立了三維數(shù)值計算模型,分別采用不同采厚和不同采寬的數(shù)值模擬手段,比較分析了工作面覆巖應(yīng)力分布特征和薄層松軟破碎頂板中應(yīng)力特征；并利用數(shù)值模擬手段,比較分析了注漿前后工作面頂板下沉量和超前支承壓力分布規(guī)律。研究結(jié)果表明： (1)不同采高條件下,工作面煤壁前方應(yīng)力峰值位置、工作面切眼后方煤柱內(nèi)應(yīng)力峰值位置均與采高成一定的正比例關(guān)系,而采動影響范圍與采高沒有明顯的關(guān)系； (2)在不同工作面長度條件下,隨著工作面長度的增加,工作面采空區(qū)應(yīng)力拱由平頂拱趨向馬鞍形應(yīng)力拱,工作面前方煤壁以及工作面后方煤柱側(cè)應(yīng)力拱擴展變化及范圍基本相同； (3)沿走向工作面切眼后方煤柱內(nèi)應(yīng)力峰值及最大相對應(yīng)力集中系數(shù),與工作面長度成非線性正比；沿走向工作面煤壁前方應(yīng)力峰值及最大相對應(yīng)力集中系數(shù),與工作面長度成非線性正比。 (4)隨著距煤壁距離的增加,工作面后方頂板下沉量先逐漸增大,然后趨于穩(wěn)定。頂板最大下沉量在未注漿時為345mm,注漿時為169mm,注漿段比未注漿段頂板下沉量明顯減小,注漿對工作面頂板下沉起到了顯著的控制左右。 (5)未注漿段工作面前方超前支承壓力最大值為33MPa,超前應(yīng)力集中系數(shù)峰值為3,注漿段工作面前方超前支承壓力最大值為30MPa,超前應(yīng)力集中系數(shù)為2.72,較未注漿段減小了9.3%；注漿后應(yīng)力集中系數(shù)變小,頂板完整性增強,注漿段受超前壓力影響程度較未注漿段小。 研究成果可為現(xiàn)場提供理論參考,對淮南潘謝礦區(qū)大采高采場薄層松軟破碎頂板的煤層安全回采提供一定的指導(dǎo)意義。
[Abstract]:Because of the shortage of coal resources in Panxie mining area in Huainan, it is of great significance to develop group A coal in Panxie mining area. According to the geological conditions of 11223 face of Paner Coal Mine in Huainan mining area, the mechanical mechanism of broken roof caving and grouting reinforcement mechanism of broken roof in large mining face are analyzed theoretically in this paper. The stability and control technology of thin layer soft broken roof in large mining face are studied by combining numerical simulation and field measurement. Three dimensional numerical simulation model was established by using FLAC3D software. The stress distribution characteristics of overburden and the stress characteristics in thin soft broken roof were compared and analyzed by using different mining thickness and different mining width respectively. By means of numerical simulation, the law of roof subsidence and leading support pressure distribution before and after grouting are compared and analyzed. The results show that: (1) under different mining height conditions, the peak position of stress in front of coal face wall and the peak position of stress in pillar behind cutting face are positively proportional to mining height. However, there is no obvious relationship between the influence range of mining and mining height. (2) under the condition of different working face length, with the increase of working face length, the stress arch in goaf of working face changes from flat top arch to saddle type stress arch, The variation and range of stress arch expansion in front coal wall and back coal pillar are basically the same. (3) the peak stress and the maximum relative stress concentration factor in the pillar are directly proportional to the length of the face; The peak stress and the maximum relative stress concentration factor in front of the coal wall along the strike face are nonlinear proportional to the face length. (4) with the increase of the distance from the coal wall, the amount of roof subsidence at the rear of the face increases gradually and then tends to be stable. The maximum subsidence of roof is 345mm without grouting and 169mm with grouting. The roof subsidence of grouting section is obviously smaller than that of non-grouting section, and grouting plays a significant role in controlling the roof subsidence of working face. (5) the maximum value of the leading support pressure, the peak value of the leading stress concentration factor and the leading stress concentration factor are 33MPa, 3and 30MPa, respectively, and the lead stress concentration factor is 2.72, respectively. Compared with the ungrouted section, the ratio of 9.3% was decreased. After grouting, the stress concentration factor becomes smaller, the roof integrity is enhanced, and the grouting section is less affected by the lead pressure than the non-grouting section. The research results can provide a theoretical reference for the field and provide certain guiding significance for the safe mining of thin layer soft broken roof of large mining height stope in Panxie mining area of Huainan.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD323

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