三维离散元模型的滑坡能量守恒模拟研究
发布时间：2019-05-22 16:10
【摘要】：岩土体的破坏涉及复杂的断裂、摩擦作用、弹性波和能量转换过程。本文给出了离散元模型中各类机械能,以及断裂热、阻尼热和摩擦热的计算理论。同时,考虑外力做功,建立了离散元能量转化和能量守恒计算法则。基于此理论改进Mat DEM软件,实现了31.2万单元三维滑坡的滑动过程和能量转化模拟。模拟中,各类机械能相互转化,并在阻尼、断裂和摩擦作用下转化为热量,但是总能量始终保持不变,有效地实现了离散元能量守恒模拟。模拟中发现滑坡滑带产生大量摩擦热,并提高滑带的温度。能量转化和热量生成曲线反映了滑坡在滑动各阶段的运动特征。此模型可广泛应用于岩土体破坏和多场耦合数值模拟研究。
[Abstract]:The failure of the rock and soil body involves complex fracture, friction, elastic wave and energy conversion process. In this paper, various kinds of mechanical energy in the discrete element model, as well as the calculation theory of fracture heat, damping heat and friction heat are given. At the same time, considering the work of external force, the method of discrete element energy conversion and energy conservation is established. Based on this theory, the MtDEM software is improved, and the sliding process and energy conversion simulation of the 31.2 million unit three-dimensional landslide are realized. In the simulation, various kinds of mechanical energy are mutually converted and converted into heat under the action of damping, fracture and friction, but the total energy is always kept constant, and the energy conservation simulation of discrete elements is effectively realized. In the simulation, the sliding belt of the landslide is found to generate a large amount of friction heat and the temperature of the sliding belt is improved. Energy conversion and heat generation curves reflect the motion characteristics of the landslide during the sliding stages. The model can be widely used in the numerical simulation of rock-soil damage and multi-field coupling.
【作者单位】： 南京大学地球科学与工程学院;南京大学(苏州)高新技术研究院;地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金(41225011,41302216) 青岛海洋科学与技术国家实验室开放基金(QNLM2016ORP0110) 苏州市科技计划项目(SYG201614)
【分类号】：P642.22
，
本文编号：2483056
[Abstract]:The failure of the rock and soil body involves complex fracture, friction, elastic wave and energy conversion process. In this paper, various kinds of mechanical energy in the discrete element model, as well as the calculation theory of fracture heat, damping heat and friction heat are given. At the same time, considering the work of external force, the method of discrete element energy conversion and energy conservation is established. Based on this theory, the MtDEM software is improved, and the sliding process and energy conversion simulation of the 31.2 million unit three-dimensional landslide are realized. In the simulation, various kinds of mechanical energy are mutually converted and converted into heat under the action of damping, fracture and friction, but the total energy is always kept constant, and the energy conservation simulation of discrete elements is effectively realized. In the simulation, the sliding belt of the landslide is found to generate a large amount of friction heat and the temperature of the sliding belt is improved. Energy conversion and heat generation curves reflect the motion characteristics of the landslide during the sliding stages. The model can be widely used in the numerical simulation of rock-soil damage and multi-field coupling.
【作者单位】： 南京大学地球科学与工程学院;南京大学(苏州)高新技术研究院;地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金(41225011,41302216) 青岛海洋科学与技术国家实验室开放基金(QNLM2016ORP0110) 苏州市科技计划项目(SYG201614)
【分类号】：P642.22
，
本文编号：2483056
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