本文選題：淺埋近距煤層　切入點(diǎn)：過煤柱　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：淺埋近距煤層上層開采結(jié)束后遺留的煤柱對(duì)下層開采影響很大,經(jīng)常導(dǎo)致下部煤層開采礦壓顯現(xiàn)明顯,甚至誘發(fā)沖擊礦壓等事故。因此本文以哈拉溝煤礦12101工作面為工程背景,對(duì)淺埋近距下煤層開采過煤柱時(shí)覆層垮落特征、裂隙演化規(guī)律及采場(chǎng)應(yīng)力分布特征進(jìn)行研究,對(duì)后續(xù)類似工作面的安全生產(chǎn)和穩(wěn)定開采具有一定指導(dǎo)意義。論文建立下煤層工作面進(jìn)煤柱、過煤柱、出煤柱(過空巷)三個(gè)不同階段煤柱上方關(guān)鍵塊體結(jié)構(gòu)的力學(xué)模型,并對(duì)其穩(wěn)定性進(jìn)行了分析。通過FLAC3D模擬軟件和相似材料模擬實(shí)驗(yàn),對(duì)過煤柱時(shí)圍巖應(yīng)力分布和覆巖運(yùn)動(dòng)規(guī)律進(jìn)行監(jiān)測(cè),將光纖Bragg光柵傳感器與PPP-BOTDA技術(shù)應(yīng)用到模擬實(shí)驗(yàn)中,對(duì)上覆關(guān)鍵層變形移動(dòng)進(jìn)行監(jiān)測(cè)。結(jié)合12101工作面現(xiàn)場(chǎng)礦壓觀測(cè)數(shù)據(jù),對(duì)工作面末采階段過煤柱時(shí)的礦壓規(guī)律進(jìn)行分析。研究表明,哈拉溝煤礦12101工作面在過輔回撤巷道時(shí),上覆1段煤柱整體隨亞關(guān)鍵層在巷道底鼓破斷線處回轉(zhuǎn),導(dǎo)致工作面壓力突然增大,出現(xiàn)強(qiáng)礦壓顯現(xiàn);進(jìn)煤柱、過煤柱和出煤柱時(shí)的超前支承壓力峰值分別為2.64 MPa、2.79 MPa和3.26 MPa,應(yīng)力集中系數(shù)平均為1.48。工作面過1段煤柱時(shí)超前支承壓力從上覆煤柱轉(zhuǎn)移至12101工作面,出輔回撤巷及排矸巷時(shí)應(yīng)力峰值達(dá)到最大,塑性區(qū)分析表明淺埋煤層開采條件下,工作面頂板呈切落式破斷�，F(xiàn)場(chǎng)監(jiān)測(cè)結(jié)果表明在過空巷時(shí)支架支護(hù)阻力明顯大于過煤柱階段時(shí)支架的支護(hù)阻力。在相似模型中光纖Bragg光柵監(jiān)測(cè)結(jié)果與巖層移動(dòng)規(guī)律一致,且過輔回撤巷時(shí)光纖H1的布里淵頻移曲線右側(cè)峰值發(fā)生突增,證明了上覆煤柱在此階段發(fā)生整體下沉,導(dǎo)致出現(xiàn)強(qiáng)礦壓顯現(xiàn)。
[Abstract]:The pillar left over from the upper layer of shallow and close coal seam has a great influence on the lower coal mining, which often leads to obvious mining pressure in the lower coal seam, and even induces accidents such as impact mine pressure. Therefore, this paper takes the 12101 working face of Haragou Coal Mine as the engineering background. The characteristics of overburden collapse, fracture evolution and stope stress distribution during coal pillar mining in shallow and short distance coal seam mining are studied. It has certain guiding significance for the safety production and stable mining of the following similar coal face. This paper establishes the mechanical model of the key block structure above the coal pillar in three different stages: the coal pillar, the coal pillar and the coal pillar in the next coal face. Through FLAC3D simulation software and similar material simulation experiment, the stress distribution of surrounding rock and the law of overlying rock movement during coal pillar are monitored, and the fiber Bragg grating sensor and PPP-BOTDA technology are applied to the simulation experiment. The deformation movement of the overlying key strata is monitored. Combined with the field pressure observation data of 12101 face, the law of mine pressure during the coal pillar passing in the final mining stage of the working face is analyzed. The study shows that the 12101 face of Hagagou coal mine is in the process of over-auxiliary retracement roadway. The whole coal pillar of the first section of the overlying layer rotates with the sub-key layer at the break line of the roadway bottom, which results in the sudden increase of the working face pressure and the appearance of the strong mine pressure. The peak value of leading support pressure in coal pillar and coal pillar is 2.64 MPa and 3.26 MPA, respectively, and the average stress concentration factor is 1.48.The leading support pressure is transferred from overlying pillar to 12101 face. The peak stress of roadway and gangue roadway reaches the maximum. The plastic zone analysis shows that under the condition of shallow coal seam mining, The field monitoring results show that the support support resistance is obviously higher than the support support resistance in the coal pillar stage. In the similar model, the monitoring results of the fiber Bragg grating are consistent with the rock movement law. Moreover, the peak value of Brillouin frequency shift curve of fiber H1 on the right side of the Brillouin frequency shift curve of fiber H1 increases suddenly when the roadway is retreated, which proves that the overlying coal pillar is sinking as a whole at this stage, which leads to the appearance of strong ground pressure.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD323

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