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受“4.25”地震影响,国道G216线K81km处发生特大型滑坡,通往尼泊尔的交通要道中断,抢险工作难以开展。为确保抢险保通顺利进行,推进灾后恢复重建,提升道路抗灾能力和口岸可持续发展,巩固西南边防,对G216国道K81特大型滑坡深入研究具有重要的政治和经济意义。通过地质勘察,以地质演化分析为基础,认识了滑坡的规模、性质及机理。分析认为,强震与地下水是滑坡的诱发因素,距坡顶高差约200m的滑塌体下落产生的冲击力是滑坡启动的必要条件。滑坡是由滑移—压致拉裂变形的岩质崩塌形成的崩坡堆积体演变而成的一个滑移—拉裂变形的碎石土滑坡。
Affected by the earthquake of “4.25”, an extra large landslide occurred at K81km of State Highway G216 and the traffic thoroughfare to Nepal was interrupted and the rescue work was difficult to carry out. In order to ensure the smooth progress of emergency rescue, promote post-disaster recovery and reconstruction, enhance the resilience of roads and the sustainable development of ports, and consolidate the southwest border defense, it is of great political and economic significance to carry out an in-depth study on the K81 super large landslide along National Highway G216. Through geological survey, based on the analysis of geological evolution, we know the scale, nature and mechanism of landslides. The analysis shows that strong earthquakes and groundwater are the inducing factors of landslide. The impact force of the landslide falling from the top of the mountain about 200m is the necessary condition for landslide initiation. Landslide is a slip-crack deformation rock-soil-gravel landslide evolved from the landslide deposits formed by the slip-and-piezoresistive deformation of rock mass.