本文選題：孤島工作面　切入點：內(nèi)錯尾巷　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：由于跳采的采煤方式不僅能有效解決采掘接替緊張的矛盾，還能降低工作面巷道應(yīng)力集中，，因此，受到很多煤炭企業(yè)的青睞，但是這種采煤方式無法避免地形成孤島工作面。這種工作面與普通工作面相比，除了受到采動引起的超前支承壓力的影響以外，而且還受到相鄰采空區(qū)側(cè)向支承壓力的影響，這就導(dǎo)致應(yīng)力集中程度很高，圍巖變形很難控制，給回采巷道的維護(hù)帶來嚴(yán)峻挑戰(zhàn)。 雖然我國許多煤礦企業(yè)都有對孤島工作面成功回采的先例和經(jīng)驗，也取得了很多寶貴的現(xiàn)場實測數(shù)據(jù)和研究成果，但大多數(shù)都是通過加強(qiáng)錨固支護(hù)、注漿加固等方式來提高工作面巷道的圍巖自身承載力，達(dá)到控制圍巖變形的目的。雖然內(nèi)錯尾巷和進(jìn)風(fēng)巷、回風(fēng)巷一樣同屬于回采巷道，但是巷道用途不同決定了加強(qiáng)錨固支護(hù)、注漿加固等方法都不適用于對內(nèi)錯尾巷圍巖的控制，巷道破損嚴(yán)重的問題一直沒有得到有效解決。 本文以陽煤二礦80704工作面內(nèi)錯尾巷為工程背景，對15＃煤層賦存條件、采煤工藝、現(xiàn)有支護(hù)方式進(jìn)行系統(tǒng)調(diào)研，理論分析了孤島工作面上覆巖層結(jié)構(gòu)特征、巷道變形破壞形式、影響因素，掌握了圍巖控制原理，結(jié)合現(xiàn)場實際情況首次提出了采用分節(jié)組裝式高強(qiáng)度鋼筋混凝土支柱對內(nèi)錯尾巷進(jìn)行加強(qiáng)支護(hù)的圍巖控制技術(shù)；利用有限元軟件ANSYS建立不同承載面積的混凝土支柱模型，加載后觀察其受力破壞情況，確定了混凝土支柱主承載面直徑為0.3m；根據(jù)巷道圍巖受力情況，采用FLAC3D軟件建立80704工作面的數(shù)值模擬模型，分別對內(nèi)錯尾巷采用原有錨固支護(hù)方案和加強(qiáng)支護(hù)方案兩種情況進(jìn)行模擬，對比分析結(jié)果表明：采用混凝土支柱加強(qiáng)支護(hù)后，巷道塑性區(qū)分布范圍大幅縮小，頂?shù)装逑鄬ξ灰屏繙p少了65%，兩幫收縮量減少了60%，巷道變形量控制在合理范圍內(nèi)，能夠保證通風(fēng)有效斷面；最終確定了80704內(nèi)錯尾巷支柱布置方案，并定期進(jìn)行礦壓觀測，根據(jù)觀測數(shù)據(jù)、巷道變形破壞現(xiàn)象、混凝土支柱受力變形情況、有效通風(fēng)斷面等方面分析內(nèi)錯尾巷加強(qiáng)支護(hù)的效果。 現(xiàn)場實測結(jié)果表明，觀測期間混凝土支柱支護(hù)段巷道表面位移較小，未出現(xiàn)明顯底鼓現(xiàn)象，支柱底端未插入底板，只有少數(shù)支柱接頂部分出現(xiàn)外皮脫落現(xiàn)象，但不影響對巷道圍巖穩(wěn)定性控制，內(nèi)錯尾巷斷面積普遍保持在7.2m2以上，斷面收縮率僅為18%，可見分節(jié)組裝式混凝土支柱對巷道圍巖穩(wěn)定性控制效果顯著，驗證了“采用分節(jié)組裝式混凝土支柱將頂板壓力傳遞到底板中央控制底鼓，同時減輕兩幫受力，進(jìn)而控制兩幫相對移近量”支護(hù)方案的正確性。 本文的研究成果在陽泉礦區(qū)具有廣泛的推廣前景，同時為面臨同類巷道支護(hù)難題的其他礦區(qū)提供參考。
[Abstract]:Because the mining method of jumping mining can not only effectively solve the tension contradiction of mining replacement, but also reduce the stress concentration in the face roadway, so it is favored by many coal enterprises. However, this mining method can not avoid the formation of isolated island face. Compared with ordinary working face, this kind of face is not only affected by the leading support pressure caused by mining movement, but also affected by the lateral supporting pressure of adjacent goaf. As a result, the stress concentration is very high and the deformation of surrounding rock is difficult to control, which brings serious challenge to the maintenance of mining roadway. Although many coal mining enterprises in our country have the precedent and experience of successful mining of isolated island face, and have also obtained a lot of valuable field measured data and research results, most of them are through strengthening anchor support. Grouting reinforcement is used to improve the bearing capacity of surrounding rock and to control the deformation of surrounding rock. However, the different uses of roadway determine the strengthening of bolting support, grouting reinforcement and other methods are not suitable for the control of the surrounding rock of the roadway. The serious problem of roadway breakage has not been effectively solved. Based on the engineering background of staggered roadway in No. 80704 working face of No. 2 Coal Mine in Yangyang Coal Mine, this paper makes a systematic investigation on the occurrence conditions of No. 15 coal seam, coal mining technology and existing supporting methods, and theoretically analyzes the structural characteristics of overlying strata and the deformation and failure form of roadway in Gudao face. Influence factors, master the principle of surrounding rock control, combined with the actual situation of the site for the first time proposed the use of segmented assembly of high strength reinforced concrete pillar to strengthen the support of the surrounding rock roadway wall rock control technology; The finite element software ANSYS is used to establish concrete strut model with different bearing area. After loading, the main bearing surface diameter of concrete pillar is determined to be 0.3m.According to the stress situation of roadway surrounding rock, the concrete bearing surface diameter is determined to be 0.3 m. The numerical simulation model of 80704 working face was established by FLAC3D software. The original bolting support scheme and the strengthening support scheme were simulated respectively. The comparison and analysis results show that: the concrete prop is used to strengthen the support, The distribution range of plastic zone of roadway has been reduced greatly, the relative displacement of roof and floor has been reduced by 65 percent, the amount of contraction of two sides has been reduced by 60, the amount of deformation of roadway has been controlled within a reasonable range, which can ensure the effective ventilation section, and the layout scheme of pillar of 80704 cross tail roadway has been determined finally. According to observation data, deformation and failure phenomenon of roadway, stress deformation of concrete prop, effective ventilation section and so on, the effect of strengthening support in inner staggered tail roadway is analyzed. The field measured results show that during the observation period, the surface displacement of the roadway in the concrete pillar support section is relatively small, there is no obvious bottom bulging phenomenon, the bottom end of the pillar is not inserted into the bottom slab, and only a few of the pillars are connected to the roof. But it has no influence on the stability control of roadway surrounding rock, the area of inner staggered tail roadway is generally above 7.2 m2, the shrinkage rate of section is only 188.It can be seen that the effect of segmented assembled concrete pillar on the stability control of roadway surrounding rock is remarkable. The correctness of the supporting scheme of "adopting segmented and assembled concrete pillars to transfer the roof pressure to the bottom plate to control the central floor drum, and at the same time reducing the force on the two sides and then controlling the relative movement of the two sides" is verified. The research results in this paper have a broad prospect in Yangquan mining area, and provide reference for other mining areas facing similar roadway support problems.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD353

【參考文獻(xiàn)】

中國期刊全文數(shù)據(jù)庫 前10條

1 賈靖,王洪軍;“孤島”工作面礦壓顯現(xiàn)規(guī)律分析[J];河北煤炭;1999年04期

2 樊友景;高建華;李大望;;均布荷載作用下兩端固支梁的彈性力學(xué)解析解[J];河南科學(xué);2006年02期

3 張曉君;靖洪文;鄭懷昌;;深部高應(yīng)力巷道圍巖破裂演化過程數(shù)值模擬[J];金屬礦山;2009年01期

4 丁乃峰;邢延團(tuán);張洪鵬;;深部孤島面回采巷預(yù)應(yīng)力錨桿支護(hù)技術(shù)[J];能源技術(shù)與管理;2007年03期

5 徐洪永;聶其能;孟凡敬;;孤島工作面沿空巷道窄煤柱控制技術(shù)研究[J];能源技術(shù)與管理;2008年01期

6 劉寧;朱維申;于廣明;;基于Mohr-Coulomb準(zhǔn)則的初期支護(hù)與圍巖耦合作用分析[J];隧道建設(shè);2007年S2期

7 柏建彪,張金亮,王龍芳;孤島綜放面巷道支護(hù)機(jī)理和技術(shù)研究[J];礦山壓力與頂板管理;2002年04期

8 梁誠成;瓦斯尾巷變形破壞機(jī)理分析及支護(hù)技術(shù)[J];礦山壓力與頂板管理;2002年04期

9 王進(jìn)義,王睿;綜放工作面窄煤柱護(hù)巷礦壓觀測與分析[J];礦山壓力與頂板管理;2003年02期

10 徐龍倉,張明杰;受跨采影響巖巷穩(wěn)定性分析[J];礦山壓力與頂板管理;2003年04期

中國博士學(xué)位論文全文數(shù)據(jù)庫 前1條

1 李佃平;煤礦邊角孤島工作面誘沖機(jī)理及其控制研究[D];中國礦業(yè)大學(xué);2012年

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