本文選題：地下工程　切入點(diǎn)：圍巖損傷　出處：《內(nèi)蒙古科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：我國(guó)作為發(fā)展中國(guó)家，煤炭在國(guó)民經(jīng)濟(jì)中依然起著至關(guān)重要的作用。隨著我國(guó)煤炭開(kāi)采深度的不斷加大以及露天煤礦必然轉(zhuǎn)入地下開(kāi)采的發(fā)展趨勢(shì)，巷道作為地下工程開(kāi)挖的交通命脈，不僅承擔(dān)著煤炭生產(chǎn)工作的正常進(jìn)行，而且保證人員的安全、保護(hù)煤炭資源的合理運(yùn)用等方面都有至關(guān)重要的作用。一般地，掘進(jìn)巷道采用的方法中，最為經(jīng)濟(jì)和實(shí)用方法的是鉆爆法。如何控制爆破產(chǎn)生的巖石損傷，就成為目前及未來(lái)一段時(shí)間重要的課題。本文以LS-DYNA平臺(tái)，對(duì)巷道爆破施工進(jìn)行了數(shù)值模擬，預(yù)測(cè)了圍巖石損傷范圍。 論文由以下幾部分組成： 1.深入比較了巷道掘進(jìn)時(shí)掘進(jìn)機(jī)法和鉆爆法的優(yōu)缺點(diǎn)，從巷道的地質(zhì)構(gòu)造、掘進(jìn)效率、施工方投資能力、開(kāi)挖方向的控制四個(gè)方面闡述了鉆爆法在可預(yù)見(jiàn)的年代不可能完全被掘進(jìn)機(jī)取代，確立本文的研究意義。 2.理論上研究了巖石爆破破碎機(jī)理，分別介紹了巖石爆破的本構(gòu)模型：彈性模型、斷裂模型、損傷模型及分形損傷模型，結(jié)合各種理論分析，，確定了本文巖體爆破時(shí)的理論基礎(chǔ)。 3.介紹了巖體爆破損傷的特征，從理論出發(fā)，在不考慮巖體初始損傷的情況下，初步預(yù)測(cè)了本文巷道爆破施工中巖體的損傷范圍，即壓碎區(qū)81mm,損傷因子0.92和破裂區(qū)的半徑281.4mm，損傷因子0.43。 4.利用LS-DYNA軟件平臺(tái)，系統(tǒng)討論了LS-DYNA的計(jì)算方法、控制方程、時(shí)間積分、人工體積粘性控制、時(shí)間步長(zhǎng)控制和無(wú)反射邊界等方面的參數(shù)設(shè)置，為后續(xù)工作提供理論依據(jù)。 5.在LS-DYNA軟件平臺(tái)上，分別對(duì)被爆巖體進(jìn)行了數(shù)值模擬，通過(guò)應(yīng)力分析，得出相應(yīng)的巖體損傷范圍約為炮孔半徑的9.2倍，驗(yàn)證理論的正確性，促進(jìn)計(jì)算機(jī)模擬技術(shù)的推廣與應(yīng)用。 6.從應(yīng)力角度出發(fā)，分析了巷道中應(yīng)力集中的地方，為施工方提供一定的理論依據(jù)。
[Abstract]:As a developing country, coal still plays an important role in the national economy in China. As the traffic lifeline of underground engineering excavation, roadway not only undertakes the normal work of coal production, but also ensures the safety of personnel and the rational utilization of coal resources. Generally speaking, The most economical and practical method used in tunneling is drilling and blasting. How to control rock damage caused by blasting has become an important subject at present and in the future. In this paper, LS-DYNA platform is used to control rock damage. The blasting construction of roadway is simulated and the damage range of surrounding rock is predicted. The thesis consists of the following parts:. 1.Compared the advantages and disadvantages of tunneling machine method and drilling blasting method, from the geological structure of roadway, tunneling efficiency, construction investment ability, This paper expounds that drilling and blasting method can not be completely replaced by roadheader in the foreseeable time from four aspects of the control of excavation direction. The research significance of this paper is established. 2. The fracture mechanism of rock blasting is studied theoretically, and the constitutive models of rock blasting are introduced, including elastic model, fracture model, damage model and fractal damage model. The theoretical basis of rock blasting in this paper is determined. 3. The characteristics of rock mass blasting damage are introduced. Based on the theory and without considering the initial damage of rock mass, the damage range of rock mass in the blasting construction of roadway in this paper is preliminarily predicted. The crushing area is 81 mm, the damage factor is 0.92, the radius of the rupture area is 281.4 mm, and the damage factor is 0.43. 4. The calculation method, control equation, time integral, artificial volume viscosity control, time step control and non-reflection boundary setting of LS-DYNA are discussed systematically by using LS-DYNA software platform, which provides theoretical basis for further work. 5. On the platform of LS-DYNA software, numerical simulation of exploded rock mass is carried out. Through stress analysis, the corresponding damage range of rock mass is about 9.2 times of the radius of the hole, which verifies the correctness of the theory and promotes the popularization and application of computer simulation technology. 6. From the stress point of view, the stress concentration in the roadway is analyzed, which provides a theoretical basis for the construction.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD235;TD263.2

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