Dissertation > Excellent graduate degree dissertation topics show

Xiangxi River Three Gorges Reservoir Development of Landslides and Slope Stability studies on

Author: FanDaBo
Tutor: ShenJunHui
School: Chengdu University of Technology
Course: Geotechnical Engineering
Keywords: Three Gorges Reservoir Area Xiangxi River Slope deformation and failure mode Resurrection landslide mechanism Stability Prediction
CLC: P642.22
Type: Master's thesis
Year: 2011
Downloads: 156
Quote: 1
Read: Download Dissertation

Abstract

Xiangxi River in Three Gorges Reservoir northwest of Hubei Province, library segment length of 34km, the estuary from the dam approximately 34.5km. The library section of geological environment is fragile, landslides, avalanches and development. Three Gorges Reservoir, destroyed the slope original natural state of equilibrium, not only in a stable storage before the resurrection of old landslides, collapsed along the roadbed, but also may lead to the occurrence of new landslides. Slope stability issues related to the safety of residents along the coast, waterways and highways normal operations. Therefore, the study Xiangxihe Landslide development characteristics, deformation and failure mechanisms and resulting impoundment slope deformation behavior, disaster prevention and mitigation section of the library work has important practical significance, but the action of water on the slope rich library deformation and failure mechanism also has some theoretical value. This geological environment conditions in the study area, slope deformation and failure characteristics of the geological structure and the system on the basis of research, focusing on the slope deformation and failure mode, mechanism of landslide occurrence and development were studied. And through the mechanism of water-rock interaction in geology and mechanical analysis of the thinking of combining action of reservoir water slide mechanism of the resurrection; consider the impact of water level scheduling, the application of limit equilibrium method and finite element analysis of the stability of the landslide resurrection . Landslides induced under conditions and factors analysis, rock slope stability evaluation predictor system, using fuzzy comprehensive geological prediction and forecasting are two methods to predict reservoir study area after the conditions of stability of rock slope. Main results obtained are as follows: (a) in the study area are mainly rocky slope slope and slope soil types; among rocky slope to reverse Layered Slope poured, poured forward layered slope, a small amount oblique layered slope, horizontal layered slope; soil slope to slope landslide accumulation body mainly small body slope colluvium, alluvium slope, slope eluvial body, artificial accumulation body slope . According to lithology, rock slope toward the direction and development of relationships and characteristics of landslides and other differences, the left and right sides of Xiangxi segment is divided into seven segments each, and describes the engineering geological characteristics of each segment. (2) around the study area slope deformation and failure modes, the left bank of the tilting forward layered slope to the term \HYPERGENE poured Reverse layered with \damage is not obvious. Landslides density varies due to different geological structure slope, where the forward development of the highest density of landslide, reverse slope, followed by the lowest density development oblique landslide, lateral landslide not developed. (3) Three Gorges reservoir water level scheduling study the effect of the resurrection of the landslide mechanism. The results show that water-rock interaction leading to the root cause of the landslide resurrection. Mudding role, erosion and other physical effects of water-rock interaction and ion exchange, dissolution, hydration and other chemical effects, reducing the landslide of rock and soil mechanics parameters, thus deteriorating the stability of landslide; generated hydrostatic water-rock interaction pressure and hydrodynamic pressure and other mechanical effects, changing the dynamic action of landslide occurrence system, create the conditions for the resurrection of the landslide. (4) used to consider the role of reservoir water limit equilibrium method and finite element method resurrection obvious signs of Bazimen landslide stability studies. The results show that when the reservoir water level raised to 175m landslide is less stable state; reservoir water plunged from 175m to 145m when the landslide instability may exist. To investigate the stability of landslide impoundment whether the impact is universal, papers selected study area development 8 typical landslide stability analysis and calculation. The results showed that 62.5% of the landslide affected by the impact of impoundment, its stability from stable - stable state down to less stable state. (5) slope deformation and failure by many factors influence and control, in order to develop conditions and landslide based on analysis of predisposing factors were used fuzzy comprehensive geological prediction and forecasting are two ways to predict the study area after the impoundment of the reservoir rock slope stability conditions, ie, good stability - better slope and poor stability - poor slope 50-50. Forecast results also showed that reservoir rocky slope on the right bank of the reverse effect is weak, but the left bank of the landslide and rock slope forward more significant impact. Therefore, that reservoir, the main study area is on the right bank slope engineering geological problems of the resurrection and the left bank of the old landslide occurrence of new landslides.

Related Dissertations

CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Engineering Geology > The geological and engineering geological > Landslide
© 2012 www.DissertationTopic.Net Mobile