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Study and Application on 3D Limit Equilibrium Method

Author: YuanFuQiang
Tutor: YaoLeiHua
School: Chinese Geology University (Beijing)
Course: Geological Engineering
Keywords: 3D limit equilibrium method Slope Stability Safety factor 3D slip surface Genetic Algorithms
CLC: TU43
Type: Master's thesis
Year: 2011
Downloads: 111
Quote: 0
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Abstract


Our country is a mountainous country, mountain accounts for about 2/3 of the land area; economic development, the mountains fill bound to create a lot of new slope. According to the Ministry of Land and Resources Statistics, in 2010 there were 22329 landslide hazard, 72.8% of the total geological disasters. Built on the Mohr-Coulomb yield criteria and static balance on the basis of two-dimensional limit equilibrium method is widely used in slope stability analysis, but the two-dimensional limit equilibrium method of slope approximately as a plane strain problem, ignore the slip surface The side barrier FORCES role calculation is too conservative. Reality slope itself is a three-dimensional problem, as a two-dimensional problem analysis, there must be limitations and imperfections, and therefore the two-dimensional analysis is extended to three-dimensional analysis, the results can be more realistic. Based on actual research needs, the three-dimensional limit equilibrium method and the proposed model is applied to the engineering examples calculated, the paper mainly include the following aspects: 1) the three-dimensional limit equilibrium method for slope stability analysis model built on IWHR three-dimensional limit equilibrium analysis of the basis of the method and model the slope stability analysis model of the three-dimensional limit equilibrium method, mainly in the three-dimensional mechanical model of the limit equilibrium method and geometric model force on column a partial improvement, to increase the shear force on the column column interface R, and provides the magnitude and direction of the R. 2) the establishment of the force, torque balance equation and solving safety factor analysis of the force on Article column, solving Article column bottom sliding surface method forces N i; establish the S direction of the overall static equilibrium equation, the establishment of a static overall in the y direction The force balance equation, as well as to establish the overall moment equilibrium equation around the y-axis. Iterative solution based on the Newton - le sang method safety factor F force E line interface bar with the x-axis angle β, the end of the angle between the plane of the shear force T and xoz slip surface for ρ. 3) the establishment of the slope 3D slip surface search model slope slip surface three-dimensional dual quadric surface Bezier slip surface search model to simplify the control parameters of the surface S = S (w, h, v d, x, y, z, θ, φ), in order to facilitate the use of genetic algorithms to search the most dangerous sliding surface 4) implementation study test programming search slip surface and slope safety factor calculation, and by the Zhang Xing ellipsoid slip surface slope example detection analysis of this model as well as the program's reliability. 5) engineering instance application to the High Fill Subgrade Slope Stability Evaluation of the small post Kunming International Airport for the engineering analysis instance, its two-dimensional, three-dimensional stability evaluation, and proposed the corresponding slope protection opinions.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Mechanics
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