The Tectonics Activity & Engineering Hazard Effects In The Northeast Margin Of Qinghai-Tibet Plateau

Owing to the Qinghai-Tibet Plateau is uplifted by a big margin, border district of the plateau becomes a natural geographic environment in which the water resources can be stored up and develop efficiently, and at the same time, as a result of the strong and persistent uplift of the plateau, the engineering geology environmental condition of these districts gets extremely complex, and the regional stability condition is very adverse. This paper takes Daliushu dam site of Heishan gorge on Yellow River as a example, the tectonics activity effect and engineering risk effect which the plateau uplift cause are studied systematically.This paper based on the study of large numbers of data, firstly advanced a dynamics model of progressive compression uplift of the plateau, in which the cause of the plateau uplift is that India plate pushes and forces Qinhai-Tibet plate northwards. And besides the author also studied the tectonics activity effect which the plateau uplift cause, the major types of active fractures in the Qinghai-Tibet Plateau, the distribution regularity of the fractures and their seismic activity in detail. Based on this, the author studied the tectonic activity effect along northeastern margin of Qinghai-Tibet Plateau, the recent activity of the Zhongwei-Tongxing fault, and the fault resistance effect.The paper also based on mechanics of fracture, rock mechanics, mechanics of materials, sort the rock failure and spread into four models, and the model of the thrust spread of fault is firstly advanced. In the study of fault rupturing, the displacement of the fault surface is studied in detail. And sort the estimate of fault displacement into three ways. By numerical analysis, studied the problem of the fault resistance effect of Daliushu dam site and the stability of dynam-relaxed rockmass. Finally Predicted the problems of fault resistance.