【摘要】 高速远程滑坡具有较强的灾害性,已逐渐成为国内外地质灾害领域研究的热点。大型滑坡滑动过程中滑带剧烈摩擦和生热,使得局部温度升高,改变岩土体的抗剪强度等性质、以及产生气垫效应等,可能促进高速远程滑坡运动。为了定量地研究滑坡滑带中热量的生成和温度场分布规律,本研究改进自主开发的MatDEM离散元软件,建立了约23万单元的二维边坡模型,对滑坡的启动、高速滑动和堆积全过程进行了数值模拟。结果表明:MatDEM较为准确地模拟了滑坡典型特征,同时展示了边坡模型的热量生成特征;模拟结果表明滑带附近形成明显的"核形"高热量带,100 m高的边坡滑带单元热量增加值最高达3×10~5J,理想条件下造成比热容为550 J/kg·℃的1 kg土体升高545.5℃左右;高热量带依附于滑带并随着滑体最厚处向前扩展;MatDEM单元连接状态图和热量场图直观地展现了滑体和滑床中的裂隙发育过程。本研究为滑坡数值模拟研究提供了一个新手段。更多还原

【Abstract】 High-speed remote landslide has become a hotspot in geological disasters due to the strong disaster.During the process of large-scale landslide,the heat generated by friction of the sliding zone increases the temperature of the local area,which changes the mechanical properties of the rock and soil.In order to explore the heat generated and accumulated in the sliding zone quantitatively,this paper developes a slope model of 230,000particles by using the Mat DEM discrete element software.It simulates the sliding process of landslide.The results show that Mat DEM simulates the typical characteristics of landslide accurately and shows the law of heat in discrete element model.The simulation results show that the"kerosene"high heat zone is formed near the sliding zone.With the highest heat at 3×10~5J in sliding zone cause the temperature increase 545.5℃with heat capacity of550J/kg·℃when the slope heights 100 m.The high speed is caused by high temperature in the slidezone.Highcalorie belt attaching to the sliding zone occur displacement accompanying the thickest sliding body.Morever,it is proved that the Mat DEM can use unit connection state and the thermal field demonstrate the development law of cracks directly in the sliding body and sliding bed,which provides a new numerical calculation in landslides.更多还原