热力耦合下大型岩质滑坡滑面“干”摩擦动力演化机理研究

The high speed and long-runout motion of large-scale rock landslides usually cause great damage. However, its mechanism special for those rock landslides which occur without the action of favorable topography, rainfall or other special conditions is not clear. In essence, the slide of these slope is a kinematics process that controlled by dry friction on sliding face. With the transformation of mass potential energy, the heat generates and aggregates on sliding face constantly, which results in the incensement of the sliding face temperature. During this process, the friction property changes and the contact face is lubricated first, then the decrease of sliding friction weakens the heat generation and restricts the temperature rise conversely. In other words, the negative feedback coupling effect of friction heat, temperature and sliding friction determines the dynamic evolution of sliding friction, and also influences the sliding character eventually. Unfortunately, research of academe on this aspect is very weak and lacks the corresponding theoretical analysis. Hence, in this project, the dry friction model with considering of thermo-mechanical coupling effects will be built first by using methods such as field model tests, theoretical analysis and numerical simulation. Then the dynamic evolution of sliding friction and the motion mechanism of high speed Landslides will be studied clearly. The outcomes of this project are expected to use in the hazard mitigation of large scale landslides.

大型岩质滑坡因高速远程性而危害巨大，但目前针对不具备气体封闭、降雨入渗或解体破碎等特殊条件的“干”摩擦型岩质滑坡高速机理还不清晰。实际上，这类滑坡的滑动可视为具有“热力耦合”特性的滑面摩擦控制下的运动学问题，即滑面“干”摩擦阻碍滑动并做功生热，而集聚的热量反过来又改变摩擦特性和生热效率，并最终影响运动。然而，这种从“热力耦合”角度讨论滑面“干”摩擦的研究还较少，相关成果在定量表达并高效求解问题上还存在不足，难以很好给出滑速、运距等减灾防灾关键动力学参数。为此，本项目针对“干”摩擦型大型岩质滑坡高速远程运动特征问题，重点从“热力耦合”角度出发，综合模型试验、理论分析、数值计算等手段，在构建滑动滑面“干”接触摩擦模型的基础上，研究岩质滑面摩擦的动力演化机制，阐明“干”摩擦型岩质滑坡高速远程运移机理，实现滑坡动力特征参数定量评估，以期为大型岩质滑坡灾害防灾减灾提供理论参考。

大型岩质滑坡因高速远程性而危害巨大，但目前针对“干”摩擦型岩质滑坡高速机理还不清晰。为此，本项目针对“干”摩擦型大型岩质滑坡高速远程运动特征问题，重点从“热力耦合”角度出发，综合模型试验、理论分析、数值计算等手段，在构建滑动滑面“干”接触摩擦模型的基础上，研究了岩质滑面摩擦的动力演化机制，阐明了“干”摩擦型岩质滑坡高速远程运移机理，实现了滑坡动力特征参数定量评估，很好的给出了滑速、运距等减灾防灾关键动力学参数，为大型岩质滑坡灾害防灾减灾提供理论参考。