煤巖組合體動(dòng)力破壞規(guī)律實(shí)驗(yàn)研究
發(fā)布時(shí)間：2018-09-01 13:37
【摘要】：沖擊地壓威脅著煤礦的安全和高效生產(chǎn)。隨著開采深度的增加、開采強(qiáng)度不斷加大以及開采條件越來越復(fù)雜,我國煤礦發(fā)生沖擊地壓的現(xiàn)象越來越多,危害越來越大,必須及早引起重視。沖擊地壓是煤巖地層受采動(dòng)影響而發(fā)生的動(dòng)力災(zāi)害現(xiàn)象,是煤巖體在外部應(yīng)力作用下快速破裂的結(jié)果,是典型的能量突然釋放與能量耗散過程。沖擊地壓一定是在能量突然釋放的驅(qū)使下發(fā)生的,既然如此,引發(fā)沖擊地壓的能量到底積聚在哪兒?對(duì)于這些積聚的能量,能否在釋放速度和強(qiáng)度上予以人為控制,以此來避免發(fā)生沖擊地壓呢?基于上述問題,本論文從能量積聚和釋放的角度出發(fā),開展組合巖體動(dòng)力破壞規(guī)律實(shí)驗(yàn)研究,目的是確定能量積聚的具體層位,從理論上提出減緩能量釋放的有效措施,從而為有針對(duì)性的防治沖擊地壓提供支撐。對(duì)煤巖體及組合體沖擊破壞過程及能量轉(zhuǎn)化規(guī)律進(jìn)行理論分析,結(jié)果表明,受巖石內(nèi)部裂紋及空隙不同的影響,其能量積聚能力的大小及能量耗散的方式有很大差別,材料強(qiáng)度、材料均質(zhì)度及能量輸入率決定了煤樣能量耗散的方式;組合體煤巖在沖擊破壞過程中,內(nèi)部巖石之間相互作用,不斷的進(jìn)行能量的傳遞與整體的平衡自組織,其中一部分巖層對(duì)組合體的能量積聚量及能量耗散特征起主要作用。對(duì)峻德礦17煤層的煤、細(xì)砂巖和粗砂巖單體進(jìn)行變形破壞實(shí)驗(yàn),分析對(duì)比煤巖單體的全過程應(yīng)力應(yīng)變曲線,結(jié)果表明煤峰前積聚能量較低,發(fā)生破壞時(shí)消耗能量少,具有強(qiáng)沖擊傾向性,粗砂巖和細(xì)砂巖峰前積聚能量比煤高得多,能發(fā)生瞬間破壞,將能量大量釋放,具有中等沖擊傾向性。巖石的強(qiáng)度越大,極限儲(chǔ)能越大,脆性越強(qiáng),彈性能釋放的越徹底。將細(xì)砂巖、粗砂巖和煤三種巖石按照設(shè)計(jì)要求進(jìn)行組合,對(duì)比分析組合試件各組分的能量儲(chǔ)存情況,實(shí)驗(yàn)結(jié)果表明在軟硬不同的組合煤巖層中,彈性模量大的堅(jiān)硬巖塊,雖不易發(fā)生變形,但儲(chǔ)能較小,不易積聚能量。而彈性模量較小的軟弱巖層,在能量儲(chǔ)存上更占優(yōu)勢,更容易積聚能量,在發(fā)生整體沖擊地壓時(shí),起主導(dǎo)作用。組合煤巖體中的能量主要積聚在軟弱巖層中,軟弱巖層是能量積聚的關(guān)鍵層。組合體中硬度差別越大,沖擊效應(yīng)越強(qiáng)。研究成果有助于更加深入的從能量積聚角度解釋沖擊地壓發(fā)生的本質(zhì),對(duì)組合巖體內(nèi)的能量分布有了較深的認(rèn)識(shí),對(duì)現(xiàn)場有針對(duì)性的防治沖擊地壓問題具有重大的理論意義。
[Abstract]:Rock burst threatens the safety and efficiency of coal mine production. With the increase of mining depth, the mining intensity is increasing and the mining conditions are becoming more and more complicated. The phenomenon of rock burst in coal mines in our country is more and more, and the harm is becoming more and more serious. Therefore, attention must be paid to it as soon as possible. Rock burst is a dynamic disaster phenomenon of coal and rock strata affected by mining. It is the result of rapid rupture of coal and rock mass under the action of external stress. It is a typical process of sudden energy release and energy dissipation. Shock ground pressure must have been driven by the sudden release of energy. In that case, where does the energy that triggers the impact pressure accumulate? Can these accumulated energies be artificially controlled in terms of release speed and intensity to avoid shock ground pressure? Based on the above problems, this paper, from the angle of energy accumulation and release, carries out an experimental study on the dynamic failure law of composite rock mass, the purpose of which is to determine the specific horizon of energy accumulation and to put forward effective measures to slow down the energy release theoretically. So as to provide support for the prevention and treatment of shock ground pressure. The impact failure process and energy transformation law of coal, rock mass and assemblage are theoretically analyzed. The results show that the magnitude of energy accumulation ability and the energy dissipation mode are very different due to different cracks and voids in rock. Material strength, material homogeneity and energy input rate determine the energy dissipation mode of coal sample. Some of them play an important role in energy accumulation and energy dissipation characteristics of the assemblage. The deformation and failure experiments of coal, fine sandstone and coarse sandstone in 17 coal seam in Junde Mine were carried out, and the stress-strain curves of coal and rock monomers were analyzed and compared. The results show that the accumulated energy before coal peak is lower, and the energy consumption is less when failure occurs. It has strong impact tendency. The accumulation of energy in front of coarse sandstone and fine sand rock is much higher than that of coal. The greater the strength of rock, the greater the limit energy storage, the stronger the brittleness and the more thoroughly the elastic energy is released. Three kinds of rocks, fine sandstone, coarse sandstone and coal, are combined according to the design requirements, and the energy storage of each component of the combination specimen is compared and analyzed. The experimental results show that in the soft and hard coal and rock combination, the hard rock with high elastic modulus is the hard rock. Although it is not easy to deform, the energy storage is small and it is difficult to accumulate energy. The weak rock with lower elastic modulus has more advantages in energy storage and accumulates energy more easily, which plays a leading role when the whole rock burst occurs. The energy in the combined coal and rock mass is mainly accumulated in the weak rock stratum, which is the key layer of the energy accumulation. The greater the hardness difference in the combination, the stronger the impact effect. The research results are helpful to explain the nature of rock burst from the perspective of energy accumulation, to understand the energy distribution in the assemblage rock, and to have great theoretical significance for the prevention and treatment of shock ground pressure in the field.
【學(xué)位授予單位】：黑龍江科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD324
本文編號(hào)：2217370
[Abstract]:Rock burst threatens the safety and efficiency of coal mine production. With the increase of mining depth, the mining intensity is increasing and the mining conditions are becoming more and more complicated. The phenomenon of rock burst in coal mines in our country is more and more, and the harm is becoming more and more serious. Therefore, attention must be paid to it as soon as possible. Rock burst is a dynamic disaster phenomenon of coal and rock strata affected by mining. It is the result of rapid rupture of coal and rock mass under the action of external stress. It is a typical process of sudden energy release and energy dissipation. Shock ground pressure must have been driven by the sudden release of energy. In that case, where does the energy that triggers the impact pressure accumulate? Can these accumulated energies be artificially controlled in terms of release speed and intensity to avoid shock ground pressure? Based on the above problems, this paper, from the angle of energy accumulation and release, carries out an experimental study on the dynamic failure law of composite rock mass, the purpose of which is to determine the specific horizon of energy accumulation and to put forward effective measures to slow down the energy release theoretically. So as to provide support for the prevention and treatment of shock ground pressure. The impact failure process and energy transformation law of coal, rock mass and assemblage are theoretically analyzed. The results show that the magnitude of energy accumulation ability and the energy dissipation mode are very different due to different cracks and voids in rock. Material strength, material homogeneity and energy input rate determine the energy dissipation mode of coal sample. Some of them play an important role in energy accumulation and energy dissipation characteristics of the assemblage. The deformation and failure experiments of coal, fine sandstone and coarse sandstone in 17 coal seam in Junde Mine were carried out, and the stress-strain curves of coal and rock monomers were analyzed and compared. The results show that the accumulated energy before coal peak is lower, and the energy consumption is less when failure occurs. It has strong impact tendency. The accumulation of energy in front of coarse sandstone and fine sand rock is much higher than that of coal. The greater the strength of rock, the greater the limit energy storage, the stronger the brittleness and the more thoroughly the elastic energy is released. Three kinds of rocks, fine sandstone, coarse sandstone and coal, are combined according to the design requirements, and the energy storage of each component of the combination specimen is compared and analyzed. The experimental results show that in the soft and hard coal and rock combination, the hard rock with high elastic modulus is the hard rock. Although it is not easy to deform, the energy storage is small and it is difficult to accumulate energy. The weak rock with lower elastic modulus has more advantages in energy storage and accumulates energy more easily, which plays a leading role when the whole rock burst occurs. The energy in the combined coal and rock mass is mainly accumulated in the weak rock stratum, which is the key layer of the energy accumulation. The greater the hardness difference in the combination, the stronger the impact effect. The research results are helpful to explain the nature of rock burst from the perspective of energy accumulation, to understand the energy distribution in the assemblage rock, and to have great theoretical significance for the prevention and treatment of shock ground pressure in the field.
【學(xué)位授予單位】：黑龍江科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD324
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 徐文彬;宋衛(wèi)東;王東旭;楊寶貴;潘衛(wèi)東;;三軸壓縮條件下膠結(jié)充填體能量耗散特征分析[J];中國礦業(yè)大學(xué)學(xué)報(bào);2014年05期
2 蔡美峰;冀東;郭奇峰;;基于地應(yīng)力現(xiàn)場實(shí)測與開采擾動(dòng)能量積聚理論的巖爆預(yù)測研究[J];巖石力學(xué)與工程學(xué)報(bào);2013年10期
3 梁昌玉;李曉;王聲星;李守定;赫建明;馬超鋒;;巖石單軸壓縮應(yīng)力-應(yīng)變特征的率相關(guān)性及能量機(jī)制試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年09期
4 黃達(dá);譚清;黃潤秋;;高圍壓卸荷條件下大理巖破碎塊度分形特征及其與能量相關(guān)性研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年07期
5 張志鎮(zhèn);高峰;;單軸壓縮下紅砂巖能量演化試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年05期
6 黃達(dá);黃潤秋;張永興;;粗晶大理巖單軸壓縮力學(xué)特性的靜態(tài)加載速率效應(yīng)及能量機(jī)制試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年02期
7 劉鎮(zhèn);周翠英;;隧道變形失穩(wěn)的能量演化模型與破壞判據(jù)研究[J];巖土力學(xué);2010年S2期
8 李忠華;潘一山;張嘯;尹亮亮;;高壓水射流切槽煤層卸壓機(jī)理[J];遼寧工程技術(shù)大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年01期
9 陸菜平;竇林名;吳興榮;牟宗龍;陳國祥;;煤巖沖擊前兆微震頻譜演變規(guī)律的試驗(yàn)與實(shí)證研究[J];巖石力學(xué)與工程學(xué)報(bào);2008年03期
10 孫振武;代進(jìn);楊春苗;楊建飛;;礦山井巷和采場沖擊地壓危險(xiǎn)性的彈性能判據(jù)[J];煤炭學(xué)報(bào);2007年08期
相關(guān)博士學(xué)位論文 前1條
1 張志鎮(zhèn);巖石變形破壞過程中的能量演化機(jī)制[D];中國礦業(yè)大學(xué);2013年
，本文編號(hào)：2217370
本文鏈接：http://sikaile.net/kejilunwen/kuangye/2217370.html
最近更新
教材專著
