| Tibet autonomous region mainly by way of road transport.The road network in the area is mainly composed of 318 main roads such as the national highway and the other 14 provincial highways.The road network is responsible for the vast majority of goods and materials in and out of Tibet transportation,related to the lifeblood of economic development in Tibet autonomous region.Due to the limitation of the terrain and the requirements of the highway exhibition in Tibet,the Tibetan roads are distributed along the river,the foot of the mountain,the mountain and the mountain.The area belongs to the plateau area,complex topography and geological structure,climate variability,temperature difference between day and night,landslide and other geological disasters are well developed.G318 line from east to west through the Hengduan Mountains Himalaya Range,the Nyainqentanglha mountains 3 mountains,hills,mountains,east to Kyaw Ba Shan,an industry pull long hill,Shergyla Mountain,Mira mountain 6 mountains.In recent years,the road geological disasters frequently,often caused by traffic disruption,a serious impact on traffic safety.Therefore,this paper choose plateau G318 line bamboo Barone Linzhi,carried out geological disaster investigation,statistical analysis of geological disasters,geological disasters classification,analyzed the distribution features,explore the causes of geological disasters,it has very important practical significance for disaster prevention and mitigation G318 Barone-Linzhi section of the line of bamboo.The main results are as follows:(1)the field geological survey was carried out to find out the engineering geological conditions of the G318-Barone-Linzhi section of the line,and to provide the geological factors for the engineering geological zoning.The area dominated by alpine canyon;strata in hard rock,soft rock;fault through the fault zone,mainly in Jinsha River,Nu River fault and Brahmaputra Jiali fault fracture zone,the development of anticline and Syncline area,the main north-south trending.The groundwater is mainly composed of loose rock pore water and bedrock fissure water.(2)the use of multi factor interaction matrix method,discusses the influence factors of leading role of engineering geological zoning of national highway 318 line Linzhi section of bamboo Barone and the,and according to its leading role in size,using Arcgis spatial analysis module of engineering geological zoning on national highway 318 line Linzhi section of bamboo Barone that is divided into 5 primary partitions,15 sub zones,37 sub district.(3)the investigation and statistical analysis on the types of geological disasters in the Barone-Linzhi section of the national highway 318-line,the development of major geological disasters along the line of a total of more than 318(section).Among them,a total of 108 landslides,318 geological disasters(section 33.96%);the deformation and failure of slope(landslide,rock and unstable rock pile of 145 and 22,the total landslide)318 geological disasters(section 45.60%);snow road 8,road 25 iceberg,water damage the 10 section.(4)the distribution of various types of geological hazards in the Barone-Linzhi section of the national highway 318 line is uneven,the topography is relatively concentrated,the lithology is relatively concentrated,and has the characteristics of seasonal development.The distribution characteristics and causes of various types of geological disasters are as follows:Distribution characteristics and genesis of debris flow:Along the road debris flow is mainly distributed in the Bomi County primary partition IV area,the development degree of the most exuberant,accounting for 35% of total amount of debris flow in this area,especially by V-3-1 distribution sub region accounted for the largest,accounting for 40% of the total area of the debris flow.In addition,V-1-1 sub district(Linzhi province),the main sub district III-1-1,III District,III-2-1 III-2-3,III-3-2,I in I-1-1 sub region partition and I-1-2 to partition IV area of debris flow development(Bomi county)development exuberant degree;the remaining districts have scattered debris flow development.The distribution characteristics are controlled by the following factors : topography,lithology,geological structure and rainfall.Distribution characteristics and origin of deformation and failure of slope:Along the road collapse,rockfall and unstable rock pile and distributed mainly in the primary partition V district(Linzhi)across the board,IV-1-2 and IV-3-1 sub district(county,Bomi region of III-1-1(eight)sub sub district,Suxian territory)II-2-1(end point paragraph zogang county territory)and sub district I-1-1,I-1-2,I-2-1,I-3-1 and the insertion of I-3-2 on the slope deformation and failure(including collapse,rock and unstable rock pile and landslide),development density.This area a total of 220 km km,accounting for only about 867 kilometers across the board,but the distribution of this type of unstable slope deformation and destruction of 25.02% of the number of 90.57%.Along the road collapse,rock mass and unstable rock pile a total of 145(section),accounting for 318 of the total geological disaster(section)of the total number of landslides,a total of 22,accounting for the total geological disaster of 318(section)of the 6.92%(45.60%).The two accounted for 52.52%.The rest of the unstable slope and deformation of sporadic development,accounting for only 9.43%.The distribution characteristics are controlled by the following factors :topography,slope rock mass structure,geological structure and rainfall;Distribution characteristics and causes of other geological hazards:Affected by meteorological conditions,topography,distribution and main road above the snow snow and snow area of Yinshan is more serious.Aufeis affected by hydrogeological conditions,groundwater is mainly developed in the development area,and in the development of large-scale snow road.Effect of the damaged section by debris flow,and the dynamic characteristics of river water changed significantly,and concentrated in the downstream area of debris flows. |
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