發(fā)布時(shí)間：2018-05-01 02:40

  本文選題：煤的成塊率 + 煤的動(dòng)態(tài)特性�。� 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：我國(guó)西部煤炭?jī)?chǔ)量豐富,是目前煤炭生產(chǎn)的主產(chǎn)地。然而,由于其成煤特性和生產(chǎn)工藝(包括綜采、機(jī)運(yùn)、轉(zhuǎn)載等)的影響和作用,到達(dá)用戶時(shí)原煤較為破碎,粉煤多、成塊率低,嚴(yán)重制約了煤炭的使用價(jià)值。鑒于此,人們已著手進(jìn)行各方面的研究,意欲提高原煤的成塊率,煤層內(nèi)超長(zhǎng)深孔爆破是為有效技術(shù)手段之一,研究煤的動(dòng)態(tài)力學(xué)性質(zhì)是其基礎(chǔ)。為此,論文以楊伙盤礦煤的原煤為例,采用實(shí)驗(yàn)室沖擊試驗(yàn)和數(shù)值模擬相結(jié)合,進(jìn)行煤的沖擊動(dòng)態(tài)力學(xué)特性研究。利用分離式霍普金森壓桿(SHPB)實(shí)驗(yàn)裝置,采用Φ50mm錐形桿對(duì)煤進(jìn)行沖擊試驗(yàn),探究不同氣壓(0.15MPa、0.20MPa、0.30MPa、0.40MPa、0.50MPa)下煤的動(dòng)態(tài)力學(xué)特性。試驗(yàn)分別在無(wú)圍壓和被動(dòng)圍壓下進(jìn)行,速度為2m/s～7m/s。通過(guò)采集到的數(shù)據(jù),用三波法得到應(yīng)力、應(yīng)變和應(yīng)變率;再用數(shù)據(jù)處理軟件進(jìn)行處理分析得獲得了應(yīng)力、應(yīng)變和應(yīng)變率時(shí)程曲線以及應(yīng)力-應(yīng)變曲線。實(shí)驗(yàn)結(jié)果表明:(1)應(yīng)變率和加載速度相關(guān)性明顯,通過(guò)擬合得到ε=3.750v2-3.624v + 43;隨著加載速度的增加,應(yīng)力-應(yīng)變曲線整體上升,曲線在加載初期,存在短時(shí)間的彈性階段,之后呈現(xiàn)明顯的塑形變形,達(dá)到峰值以后,在很短的時(shí)間內(nèi),應(yīng)變繼續(xù)增加,應(yīng)力保持不變,最后進(jìn)入卸載階段,應(yīng)變會(huì)出現(xiàn)回彈現(xiàn)象;(2)被動(dòng)圍壓下,煤的抗破壞能力有所增強(qiáng),應(yīng)力-應(yīng)變曲線有所上升,軸向應(yīng)力比無(wú)圍壓下增加1.0～1.3倍,應(yīng)變回彈明顯,說(shuō)明套筒可以增強(qiáng)煤試件的抗變形能力。利用ANSYS/LS-DYNA對(duì)煤的動(dòng)態(tài)力學(xué)性質(zhì)進(jìn)行模擬,結(jié)果以發(fā)現(xiàn)煤的破壞從兩端和中間開始,并逐漸貫通,直至破碎。整合數(shù)值模擬的應(yīng)力與應(yīng)變數(shù)據(jù),得到煤的動(dòng)態(tài)應(yīng)力-應(yīng)變曲線,相應(yīng)的加載速度為3m/s、4m/s、5m/s和6m/s。通過(guò)比較,該應(yīng)力與應(yīng)變的變化趨勢(shì)與實(shí)驗(yàn)曲線吻合,從而證明了實(shí)驗(yàn)的正確性。
[Abstract]:The west of China is rich in coal reserves and is the main producing area of coal production at present. However, due to the influence and effect of coal forming characteristics and production technology (including fully mechanized coal mining, mechanical transportation, reloading, etc.), the raw coal is more broken, the pulverized coal is more, and the lump rate is low, which seriously restricts the use value of coal. In view of this, people have begun to carry out various aspects of research, with the intention to improve the block rate of raw coal, the ultra-long deep-hole blasting in coal seam is one of the effective technical means, and the study of dynamic mechanical properties of coal is its basis. Therefore, taking the raw coal of Yangyangpan Coal Mine as an example, the dynamic mechanical properties of coal impact are studied by combining the laboratory impact test with numerical simulation. In this paper, the impact test of coal with 桅 50mm conical rod was carried out by using split Hopkinson pressure bar SHPB. the dynamic mechanical properties of coal under different pressure of 0.15 MPA ~ 0.20 MPA ~ 0.30 MPA ~ 0.40 MPa ~ (0. 50 MPA ~ (-1) were investigated. The experiments were carried out at a speed of 2 m / s to 7 m / s under no confining pressure and passive confining pressure respectively. The stress, strain and strain rate are obtained by three wave method, and the stress, strain and strain rate time history curves and stress-strain curves are obtained by data processing software. The experimental results show that the strain rate has obvious correlation with the loading speed, and the fitting results show that 蔚 = 3.750v2-3.624v 43. With the increase of loading speed, the stress-strain curve increases as a whole, and the curve has a short elastic stage in the early stage of loading. The strain continues to increase in a very short period of time, and the stress remains unchanged. Finally, when the strain enters the unloading stage, the strain will appear springback under passive confining pressure. The failure resistance of coal is enhanced, the stress-strain curve is increased, the axial stress is increased by 1.0 ~ 1.3 times than that without confining pressure, and the strain springback is obvious, which indicates that the sleeve can enhance the deformation resistance of the coal specimen. The dynamic mechanical properties of coal are simulated by ANSYS/LS-DYNA. The results show that the destruction of coal starts from the two ends and the middle, and goes through gradually until it is broken. The dynamic stress-strain curves of coal are obtained by integrating the stress and strain data of numerical simulation. The corresponding loading speeds are 3 m / s ~ 4 m / s ~ 4 m / s ~ 5 m / s and 6 m / s / s. By comparison, the variation trend of the stress and strain is in agreement with the experimental curve, which proves the correctness of the experiment.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD315

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