巷道掘进爆破中围岩损伤范围的数值模拟

发布时间：2018-03-20 13:13

本文选题：地下工程　切入点：围岩损伤　出处：《内蒙古科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国作为发展中国家，煤炭在国民经济中依然起着至关重要的作用。随着我国煤炭开采深度的不断加大以及露天煤矿必然转入地下开采的发展趋势，巷道作为地下工程开挖的交通命脉，不仅承担着煤炭生产工作的正常进行，而且保证人员的安全、保护煤炭资源的合理运用等方面都有至关重要的作用。一般地，掘进巷道采用的方法中，最为经济和实用方法的是钻爆法。如何控制爆破产生的岩石损伤，就成为目前及未来一段时间重要的课题。本文以LS-DYNA平台，对巷道爆破施工进行了数值模拟，预测了围岩石损伤范围。论文由以下几部分组成： 1.深入比较了巷道掘进时掘进机法和钻爆法的优缺点，从巷道的地质构造、掘进效率、施工方投资能力、开挖方向的控制四个方面阐述了钻爆法在可预见的年代不可能完全被掘进机取代，确立本文的研究意义。 2.理论上研究了岩石爆破破碎机理，分别介绍了岩石爆破的本构模型：弹性模型、断裂模型、损伤模型及分形损伤模型，结合各种理论分析，，确定了本文岩体爆破时的理论基础。 3.介绍了岩体爆破损伤的特征，从理论出发，在不考虑岩体初始损伤的情况下，初步预测了本文巷道爆破施工中岩体的损伤范围，即压碎区81mm,损伤因子0.92和破裂区的半径281.4mm，损伤因子0.43。 4.利用LS-DYNA软件平台，系统讨论了LS-DYNA的计算方法、控制方程、时间积分、人工体积粘性控制、时间步长控制和无反射边界等方面的参数设置，为后续工作提供理论依据。 5.在LS-DYNA软件平台上，分别对被爆岩体进行了数值模拟，通过应力分析，得出相应的岩体损伤范围约为炮孔半径的9.2倍，验证理论的正确性，促进计算机模拟技术的推广与应用。 6.从应力角度出发，分析了巷道中应力集中的地方，为施工方提供一定的理论依据。
[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.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD235;TD263.2

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