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Research team of professor Cheng Qianggong successfully completed the field investigation of the key project 2016 National Science Foundation

October 20th to November 10th, 2016, with the support of key project of the National Science Foundation (NSF) of China, "research on the mechanism of self-excited vibration drag reduction, rheological transformation and stop accumulation of high-speed remote landslide in Sichuan-Tibet Railway Alpine Gorge area and prevention of energy-dissipation compound", Prof. Cheng and his research team: Cai Fei (Japan Gunma University , Wang Yufeng, Yang Qingqing, Dai Zili (Japan Shimane University), Yang Hufeng, and doctoral student Lin Qiwen, Li Kun, Kong Kongming and Liu Feicheng a total of 10 people, on the planned Sichuan-Tibet railway along the geological hazards of the detailed field geological survey work.

Sichuan-Tibet Railway is on the southeastern edge of the Qinghai-Tibet Plateau, the "roof of the World", through the Sanjiang tectonic belt, the Himalayan orogenic belt of the Alpine Gorge area, and is the world's most complex geological conditions, the most types of engineering geology problems, the most difficult terrain and geography. Railway planning through the southeast edge of the Qinghai-Tibet Plateau, the Alpine Gorge area, because of the Indian plate and Eurasian Plate Collision belt, the new tectonic movement is strong, the earthquake activity is frequent, the Qinghai-Tibet Plateau strongly uplifting, the river unceasingly cuts, causes remark differences in topography, the Alpine canyon aspect, the high steep slope development; In recent years, along with the global climate warming, gacier retreat, resulting in extreme weather and other unusual climatic events. Under these active crustal and internal forces, the major geologic disasters, such as collapse, landslide and debris flow induced in the Alpine Canyon area, not only have the characteristics of complete type, large distribution density and high frequency of explosion, but also have large scale of activities, high degree of harm and wide influence, It is rare in other regions with similar topography and geological environment, so it can be called as a special geological hazard museum created by natural geography and geological environment. Many major geologic hazards processes and their products, especially the geometric, kinematic and dynamic characteristics of high speed remote landslide events, are also very representative, which is a natural laboratory for studying the dynamic mechanism of high speed and long-range landslides in China.

 

The giant potential landslides caused by the complex geological environment in the alpine gorge area of the southeastern margin of the Qinghai-Xizang Plateau is a major engineering geology problem which affects the prophase planning, medium construction and safe operation of Sichuan-Tibet railway. The major geological hazard chain, represented by high speed and long distance landslide, not only affects railway line selection, but also restricts the safety of future railways. Therefore, it is necessary to carry out the research on the dynamics of high speed remote landslide and the mechanism of disaster prevention and control in the Alpine Gorge area of Sichuan-Tibet railway on the basis of comprehensive research on the field investigation, Series physical model experiment, fine numerical simulation and deep theoretical analysis. To explore the mechanism of the internal and external dynamics of the Qinghai-Xizang plateau uplift mechanism to the high speed and long-range landslide disaster events, and reveal the mechanism of major geological disasters and large-scale human engineering activities.

 


According to the key Project research project, this year the Geological disaster investigation work mainly along the National Highway 318 line. Research team members, crossed the Hengduan mountains (successively over several mountains with the altitude more than 10 elevation 4100-5130m of the high mountain Wu Kou Zheduo Mountain, Gaoer Temple Mountain, Scissors Bend Mountain, Kazila, Haizi Mountain, Zombara, Dondashan, Yala, Andura, Sejila and Mila, etc.), and crossed the Sanjiang River (Jinsha River, Lancang River, Nu River). The trip lasted 22 days with cumulative itinerary of 12200 km; overcome the high altitude hypoxia, high and difficult terrain and other unfavorable environmental factors, unity and struggle, work together to complete the National Science Foundation of China's key projects 2016 geological disaster scientific investigation.


The field survey work, included the following three aspects of the work: (1) The use of advanced space information technology and in-depth and meticulous field geological survey methods, to investigate and obtain the development of geological disasters and their occurrence of topographic landforms, geological structure, geological structure, seismic activities, abnormal climatic events, The basic characteristics of human engineering activities such as the environment of pregnancy and disaster; (2) by focusing on the large scale mapping of engineering geology in the landslide area, this survey work preliminarily reveals the motion regularity and characteristics of the whole process of high speed and long distance landslide, and the engineering geology model of its formation and evolution, and establishes its basic disaster mode. (3) The sample collection of rock and soil body in landslide area is carried out.

The geological hazard investigation has preliminarily established the geological prototype of subsequent physical simulation and numerical simulation, which lays a good foundation for the smooth development of the next work.