淺埋特大采高綜采面沿空側(cè)強礦壓顯現(xiàn)機理研究
發(fā)布時間：2018-08-27 11:16
【摘要】：神東礦區(qū)大柳塔煤礦7m特大采高52303工作面回采過程中,沿空側(cè)機尾區(qū)域以及回風(fēng)順槽出現(xiàn)了強烈的礦壓顯現(xiàn),給安全高效生產(chǎn)帶來了嚴(yán)重的影響。論文綜合運用現(xiàn)場實測、理論分析以及數(shù)值模擬等手段,對沿空側(cè)區(qū)域強礦壓顯現(xiàn)機理、影響因素及其防治對策展開了深入研究。對比分析了三個不同開采區(qū)域各類礦壓顯現(xiàn)強度指標(biāo),發(fā)現(xiàn):機尾130#~151#支架范圍內(nèi)的工作面礦壓顯現(xiàn)規(guī)律與回風(fēng)順槽礦壓顯現(xiàn)規(guī)律,在不同開采區(qū)域有著顯著的差異性。運用巖體的極限平衡理論,得出:埋深達250m時,兩側(cè)采空的20m寬區(qū)段煤柱發(fā)生塑性失穩(wěn),這將引起施加其上的集中應(yīng)力向前方轉(zhuǎn)移而施加到一側(cè)采空煤柱區(qū)域及工作面超前實體煤上,加劇了煤體塑性區(qū)寬度擴展,進而導(dǎo)致了52303工作面機尾區(qū)域及回風(fēng)順槽的強礦壓顯現(xiàn)。同時,UDEC數(shù)值模擬結(jié)果及現(xiàn)場實測進一步驗證了兩側(cè)采空區(qū)段煤柱失穩(wěn)是引發(fā)此類強礦壓顯現(xiàn)的關(guān)鍵環(huán)節(jié)。通過FLAC3D數(shù)值模擬,掌握了煤層埋深、工作面采高、區(qū)段煤柱寬度3個因素對強礦壓顯現(xiàn)的影響規(guī)律。結(jié)果表明:當(dāng)埋深大于250m或采高大于7m時,區(qū)段煤柱臨近塑性失穩(wěn)狀態(tài),勢必引起工作面沿空側(cè)的強礦壓顯現(xiàn);而當(dāng)煤柱寬度為大于25m時,區(qū)段煤柱能保證其自身穩(wěn)定性,則不會對工作面沿空側(cè)礦壓造成影響�；诨⌒稳菈K回轉(zhuǎn)運動和煤柱寬度的影響,提出了增加區(qū)段煤柱的留設(shè)寬度、超前工作面對區(qū)段煤柱實施注漿加固煤柱、爆破強放工作面頂板減輕煤柱上覆載荷等防治對策,指導(dǎo)了鄰近52302工作面的安全回采。
[Abstract]:During the mining process of the 7m mining height 52303 working face of Daliuta Coal Mine in Shendong Mining area, strong mine pressure appeared along the goaf tail area and the return air trench, which brought serious influence to the safe and efficient production. By means of field measurement, theoretical analysis and numerical simulation, the mechanism, influencing factors and control measures of strong rock pressure along the goaf are studied in this paper. By comparing and analyzing the intensity indexes of various kinds of rock pressure in three different mining areas, it is found that the law of mine pressure behavior in working face within the range of 130#n151# support and the law of mine pressure appearing in return air in the same trench have significant differences in different mining areas. Based on the limit equilibrium theory of rock mass, it is concluded that when the buried depth is 250 m, the plastic instability of coal pillar in 20m wide section of both sides of mining occurs. This will cause the concentration stress on the coal to be transferred forward and applied to the coal pillar area of one side and the coal face leading to the solid coal, which will aggravate the width expansion of the plastic zone of the coal body. This result in the strong mine pressure in the tail area of 52303 face and the return air trench. At the same time, the numerical simulation results of UDEC and the field measurements further verify that the instability of coal pillar in both goaf sections is the key link to trigger this kind of strong rock pressure behavior. Through FLAC3D numerical simulation, the influence of three factors, including coal seam depth, face mining height and section pillar width, on the behavior of strong rock pressure is grasped. The results show that when the buried depth is more than 250 m or the mining height is more than 7 m, the section pillar is near the plastic instability state, which will inevitably cause the strong rock pressure along the face, and when the coal pillar width is more than 25 m, the section pillar can guarantee its own stability. It will not affect the mine pressure along the gob side of the face. Based on the influence of rotary movement of arc triangle block and the width of coal pillar, this paper puts forward some preventive countermeasures such as increasing the retaining width of coal pillar in the section, strengthening the pillar with grouting in front of the pillar in advance, and reducing the overburden on the coal pillar by blasting the roof of strong caving working face. It guides the safe mining of the adjacent 52302 working face.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD323
本文編號：2207112
[Abstract]:During the mining process of the 7m mining height 52303 working face of Daliuta Coal Mine in Shendong Mining area, strong mine pressure appeared along the goaf tail area and the return air trench, which brought serious influence to the safe and efficient production. By means of field measurement, theoretical analysis and numerical simulation, the mechanism, influencing factors and control measures of strong rock pressure along the goaf are studied in this paper. By comparing and analyzing the intensity indexes of various kinds of rock pressure in three different mining areas, it is found that the law of mine pressure behavior in working face within the range of 130#n151# support and the law of mine pressure appearing in return air in the same trench have significant differences in different mining areas. Based on the limit equilibrium theory of rock mass, it is concluded that when the buried depth is 250 m, the plastic instability of coal pillar in 20m wide section of both sides of mining occurs. This will cause the concentration stress on the coal to be transferred forward and applied to the coal pillar area of one side and the coal face leading to the solid coal, which will aggravate the width expansion of the plastic zone of the coal body. This result in the strong mine pressure in the tail area of 52303 face and the return air trench. At the same time, the numerical simulation results of UDEC and the field measurements further verify that the instability of coal pillar in both goaf sections is the key link to trigger this kind of strong rock pressure behavior. Through FLAC3D numerical simulation, the influence of three factors, including coal seam depth, face mining height and section pillar width, on the behavior of strong rock pressure is grasped. The results show that when the buried depth is more than 250 m or the mining height is more than 7 m, the section pillar is near the plastic instability state, which will inevitably cause the strong rock pressure along the face, and when the coal pillar width is more than 25 m, the section pillar can guarantee its own stability. It will not affect the mine pressure along the gob side of the face. Based on the influence of rotary movement of arc triangle block and the width of coal pillar, this paper puts forward some preventive countermeasures such as increasing the retaining width of coal pillar in the section, strengthening the pillar with grouting in front of the pillar in advance, and reducing the overburden on the coal pillar by blasting the roof of strong caving working face. It guides the safe mining of the adjacent 52302 working face.
【學(xué)位授予單位】：中國礦業(yè)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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本文編號：2207112
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