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The Deformation Mechanics and Stability Study of Bedding Bank Rock Slopes in the Head Area of the Three Gorges Reservoir

Author: LiYuanYao
Tutor: YinKunLong
School: China University of Geosciences
Course: Geological Engineering
Keywords: Three Gorges reservoir area The variable inclination Shun bank layer Bank Structure model Deformation and failure mode Sensitivity analysis Numerical Simulation
CLC: P642.22
Type: Master's thesis
Year: 2007
Downloads: 371
Quote: 6
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Abstract


Widely distributed with variable angle structure BEDDING bank slope, normal development of large and medium-sized rocky landslide in the Three Gorges Reservoir area. Under normal circumstances, they are often in a state of \However, when its destruction, but also has huge, sudden, serious harm significantly. Three Gorges reservoir area of ??geological context is the most special, by the impoundment affect one of the biggest of the lot, at the same time the most intensive area of ??these variables ANGLE DIP BEDDING bank slope at the population and construction facilities. Therefore, the Three Gorges reservoir area and dip angle of bedding bank slope deformation mechanism and stability to carry out a study has important theoretical value and social significance. In this paper, on the basis of the actual work of data collection, field engineering geological survey, deep drilling and indoor test, statistical analysis, geomechanical analysis, limit equilibrium analysis and numerical simulation of a variety of research tools. First of all proceed from the Regional Bedding bank slope development and distribution characteristics, geological structural characteristics of the typical BEDDING bank slope, rock bedding landslide development characteristics, mechanism of action of various factors affecting the, and Shun layer of bedrock slope deformation failure modes; Furthermore, soil slope region of the Israeli-Palestinian thing as a typical instance, from a quantitative point of view of the various factors affecting the primary and secondary size and explore this nascent exogenic factors in the Three Gorges Reservoir, bank slope deformation mechanisms and the change of stability characteristics. Through the above study, reached the following conclusions: (1) in the Three Gorges reservoir area, BEDDING bank slope distribution, the breaking strength is much larger than the reverse slope and transverse slope, the development of large and medium-sized landslide highest probability of bank slope type. (2) the area along the bank layer can be divided into two types of flat levels and variable inclination. Which variable inclination BEDDING slope is the main bank slope type, its various forms. Five typical bank slope and dip angle of bedding geological structure of the model: on the steep relief under the chair-like dip slope (broken down into three categories), on steep - slow - steep dip slope, wavy (or ladder like) dip slope. Their breaking strength was significantly greater than the slope of the straight level BEDDING, wire deformation and failure modulus at 450 Articles / km or more. (3) The area of ??rock bedded landslides, mainly developed into the fold turning part and to the anticline transition parts, as well as hard and soft white stratum or strata with thin weak interlayer scale to large and medium-sized. The impact of gravity in progressive slow extrusion deformation. Exogenic geological, such as rainfall, reservoir storage, such as earthquakes, are important causes of of rock bedded landslide generated. (4) combined with the work of their predecessors, the impact area of ??bedding slope stability of internal factors and external dynamic action, their main mechanism of action. Area and dip angle of bedding slope sliding failure mode is sliding - bending - BEDDING. (5) Measured Bank Structure, West marina slope of bedrock slope deep in T 2 the b 3 limestone formations development of a total of three layers broken belt, broken with cis-layer, continuous, with certain changes in the thickness of the space features. A fracture zone between these layers and of T 2 the b 3 / T 2 b 2 of the contact surface of the West marina the bottom of the slope bank bedrock deformation boundaries. (6) limit equilibrium analysis method, calculate the slope bedrock of West marina bank slope stability of the four potential landslide. Found in the design of a variety of conditions and load combinations, the slope is stable: bank slope from the surface to deep levels of potential landslide stability coefficient showed a decreasing trend, the lower landslide (grade III slip level IV landslide) plays a controlling role in the overall stability of the bank slope. Level III slip and Ⅳ stage rotary stability reserve is not high, the role of the VII degree earthquake will be in a stable critical state, West marina slope of bedrock slope may slip deep. (7) try to combine the orthogonal design with SPSS statistical software analysis of variance module, bank slope of multivariate sensitivity analysis, draw potential slip weight of gamma potential slip bands cohesion c, internal friction angle ? and earthquake α h and reservoir water level H and other factors, Ⅰ, II, III and IV level of landslide stability affect the size of the order is not the same. (8) GEO-SLOPE finite element simulation software to simulate in a hydrological year fluctuation in the Three Gorges Reservoir, West marina slope bank bedrock of steady state and transient seepage field changes. Found: ① bank slope groundwater hydraulic gradient is very small, in the natural steady state groundwater depth of the great. (2) Library rapid rise in the water level, the groundwater level of the slope is not fast with the reservoir water level to rise, with a certain time lag; limited pore water pressure distribution in the reservoir with a bank slope deep within the range of approximately 100m. ③ drawdown process, groundwater saturation line was bent to the outside of the slope, the distribution of pore water pressure as the water level dropped significantly downward and inward bending; drawdown seepage field of the following parts in the the bank slope deep and reservoir level have an important impact, little more than 175m seepage field. (9) bank slope the transient seepage field of simulation results based on the analysis of reservoir water level fluctuation under the action of bank slope stability variation. Found that the rising reservoir water, the bank slope stability factor of gradually declined; With the decline of the reservoir water level, the bank slope stability factor is gradually increased, but the value and can not be restored to the extent of the reservoir water level when the initial state.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Engineering Geology > The geological and engineering geological > Landslide
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