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滑坡体运动模型是计算滑速、滑距及滑体动能等运动特征参数的基础,是滑坡致灾范围及致灾强度评估的关键技术,现有运动模型将滑体作为质点或刚性块体,没有考虑下滑过程中内部崩解摩擦耗散的能量,而实际滑坡中这部分能量对滑坡致灾强度指标有较大影响,为此,基于滑体下滑运动机理提出了一种考虑内部耗能的运动模型,该模型将滑体下滑运动抽象为变形体平面运动问题,并将滑体简化为内部变形受力服从滑体土直剪实验破坏后应力应变关系的质点黏壶系统,从而建立其运动学控制方程。还推导了黏阻力计算公式,与运动方程联立得出滑速、滑体动能、滑体重力势能、滑体内部耗能及滑距的计算公式。结合实际滑坡工程进行计算分析得出,该模型一定程度上反映了滑体运动过程中内部崩解摩擦耗能的规律,计算结果与离散单元模拟结果及模型试验规律相近,比传统的运动模型更贴近实际,且比数值模拟更简捷,为滑体运动模型理论研究和工程推广提供了一种新的途径。
The landslide movement model is the basis for calculating the movement characteristic parameters such as sliding speed, sliding distance and kinetic energy of the sliding body, and is the key technology for evaluating the disaster-affected range and the disaster-induced strength of the landslide. The existing moving model uses the sliding body as a mass or rigid block, However, the energy dissipated by internal disintegration friction does not take into account during the descending process. However, the energy of this part of landslide has a great influence on the index of disastrous intensity of landslide. Therefore, based on the mechanism of gliding motion, The model abstracts the sliding motion of the sliding body into the plane movement problem of the deformed body and simplifies the sliding body into the mass-sticking pot system whose inner deformation is subjected to the stress-strain relationship after the failure of the sliding body under direct shear test, so as to establish its movement Learn control equations. The formula of viscosity resistance is also deduced, and the equations of sliding speed, kinetic energy of sliding body, gravitational potential energy of sliding body and energy consumption and sliding distance of sliding body are derived simultaneously with the equations of motion. According to the actual landslide engineering calculation and analysis, the model shows that the model can reflect the internal collapse frictional energy dissipation to a certain extent. The calculation results are similar to the discrete element simulation results and the model test laws, more than the traditional model Close to reality, and simpler than the numerical simulation, providing a new way for theoretical research and project promotion of the sliding body motion model.