公路滑坡侵蚀运动过程的仿真分析

为了研究公路滑坡运动的机理,减轻公路建设中滑坡灾害的影响,以陕西铜川-王石凹公路2#滑坡侵蚀为实例,论述了公路滑坡侵蚀的地质地貌条件和变形特征。认为2#滑坡为牵引式滑坡,是古滑坡的复活,2#滑坡的滑移方式和方向与老滑坡不同,2#滑坡处于非稳定状态。建立了地质模型和计算模型,采用离散元法对滑坡侵蚀运动过程进行了仿真分析,对该滑坡滑动后可能造成的灾害程度及侵蚀量进行了评估。结果表明:2#滑坡的运动过程可分为:启动破坏阶段、剧动加速阶段、高速运动阶段、碰撞减速阶段和停滞缓动阶段5个阶段;2#滑坡滑动后,潜在滑坡侵蚀量将达到1409×104m3,因此该段公路必须进行滑坡治理或改道。

Simulation on moving process of landslide erosion in highway

In order to study the mechanism of landslide movement and reduce landslide disaster in the construction of highway,the geological and physiognomic conditions and deformation behavior of the landslide were analyzed with the case of the 2# landslide erosion of Tongchuan-Wangshiao Highway.The 2# landslide which renewed from the old landslide was a pull-type landslide,while the slip style and direction of the 2# landslide varied from the old one and is in an unstable situation.The geological model and the calculating model was put forward.In addition,by using the discrete element method,the simulation analysis of the erosion movement process of the landslide was carried out,and the disaster degree and erosion amount caused by the landslide erosion movement were evaluated.The erosion movement process of the landslide could be divided into five periods,i.e.,start-up phase,accelerating phase,high-speed movement phase,bumping-deceleration phase and stopping phase.Based on the results of landslide disaster evaluation,the potential landslide erosion caused by the movement of the 2# landslide of Tongchuan-Wangshiao Highway could reach 14,090,000 m3,which means that the 2# landslide must be controlled or the portion of TongchuanWangshiao Highway must be relocated.1 tab,7 figs,10 refs.