刀具冲击作用下岩石损伤破坏过程数值模拟

发布时间：2018-05-24 12:29

本文选题：冲击破岩 + 节理岩体　；参考：《大连理工大学》2013年硕士论文

【摘要】：近年来,随着社会发展的需求和科学技术水平的不断提高,地下活动空间及各类资源的开发和利用己然成为人类重点关注的领域之一。随着各类挖掘机广泛应用于矿山开采、隧道开挖、油气井钻进等实际工程中,对岩石破碎理论和技术提出了新的挑战。冲击破岩作为一种主流的破岩手段,具有破碎岩块较大,作业效率高等优点,并且在大量的理论研究和工程实践的相互促进下,冲击破岩技术被广泛的应用于各行业之中。本文运用RFPA2D动态软件,基于细观损伤力学和动力有限元方法,从高效求解动力有限元方程着手,分析了不同现实条件中岩体在刀头冲击作用下损伤破碎的全过程。具体研究可分为以下几个方面： (1)从求解动力有限元大型稀疏对称矩阵着手,探讨了几种不同大型稀疏对称矩阵方程组的求解方法在求解耗时和系统内存消耗方面的差异,针对普通SSOR-PCG法由于需要组装总体刚度矩阵而导致消耗系统内存量较大这一问题,改善了传统的KV存储方式,并通过OpenMP共享内存编程模型技术,实现单机多核多线程的动力有限元并行计算,进一步提高了求解效率。 (2)研究了不同间距、不同倾角的节理分布岩体在刀具冲击荷载作用下的破坏力学行为,探讨了节理面对应力波的削弱作用,数值分析了不同节理的分布对岩体裂纹生成、贯通和延伸的影响。 (3)深入探讨了刀具冲击荷载和静荷载联合破岩过程。通过对比分析岩体在刀具单一动载、动静联合荷载和静态围压条件下动静联合荷载三种情况下岩体破碎的全过程,以揭示动静联合荷载下,静压与动载对岩体破碎形式的影响。
[Abstract]:In recent years, with the development of society and the improvement of the level of science and technology, the development and utilization of underground space and all kinds of resources have become one of the most important fields of human attention. With the wide application of various excavators in mining, tunnel excavation, oil and gas well drilling and other practical projects, new challenges to rock breaking theory and technology have been put forward. As a mainstream method of rock breaking, impact rock breaking has the advantages of large broken rock mass and high working efficiency. Under the mutual promotion of a large number of theoretical research and engineering practice, impact rock breaking technology has been widely used in various industries. In this paper, based on the mesoscopic damage mechanics and dynamic finite element method, RFPA2D dynamic software is used to solve the dynamic finite element equations efficiently. The whole process of rock damage and breakage under the impact of the blade head in different practical conditions is analyzed in this paper. Specific studies can be divided into the following areas: 1) starting from solving large sparse symmetric matrix of dynamic finite element, this paper discusses the differences in solving time consuming and system memory consumption of several methods of solving different large sparse symmetric matrix equations. In order to solve the problem that the general SSOR-PCG method needs to assemble the total stiffness matrix, which leads to the consumption of large amount of system memory, the traditional KV storage mode is improved, and the programming model technology of OpenMP shared memory is used. Dynamic finite element parallel computation of single machine with multi-core and multi-thread is realized, and the efficiency of solving is improved. (2) the destructive behavior of jointed rock mass with different spacing and inclination under the impact loading of cutting tools is studied. The weakening of joints to stress waves is discussed. The distribution of different joints on the formation of rock mass cracks is numerically analyzed. The effect of penetration and extension. The rock breaking process combined with tool impact load and static load is discussed in detail. In order to reveal the influence of static and dynamic loads on rock mass breakage, the whole process of rock mass breakage under single dynamic load, combined dynamic and static load and static confining pressure is compared and analyzed in order to reveal the influence of static pressure and dynamic load on rock mass breakage under combined dynamic and static loads.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU45

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