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Analysis of Stress-Strain and Stability for Longitudinal RCC Cofferdam Foundation in Liuku Hydropower Station

Author: LiuZuo
Tutor: ZhangJianHai
School: Sichuan University
Course: Geotechnical Engineering
Keywords: Cofferdam Finite Element Method Seepage Stress Strain Stability Particle Swarm Optimization
CLC: TV551.3
Type: Master's thesis
Year: 2005
Downloads: 123
Quote: 0
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Abstract


Cofferdam foundation stability of the key factors affecting the normal construction . The six library hydropower longitudinal RCC cofferdam base alluvium and bedrock for extrusion broken rock weir Kiki rock low variable modulus (E0 = 0.04 ~ 0.048Gpa), poor geological conditions , therefore Liuku hydropower the RCC cofferdam foundation longitudinal stability is the key technical issues of the project . This paper , three-dimensional nonlinear finite element method , seepage , stress , strain and stability of calculation and analysis , and particle swarm optimization algorithm the weir base slope stability . Content and calculation results include the following aspects: 1. Nonlinear finite element analysis of the cofferdam three typical two-dimensional cross-section and of 3D seepage field . The analysis results show that the D seepage flow analysis obtained profile head distribution and osmotic pressure similar distribution pattern . Showed for the rapid reduction of the head at two cut-off wall at ; in sandy cobble alluvium and bedrock Department of decay . The effect of seepage cutoff wall in two significant . First , the two-dimensional nonlinear finite element method to analyze the stress and strain of the the cofferdam three typical two - dimensional profile , calculated based on the cut-off wall and cushion shear , axial force and bending moment verification and improvement of the cutoff wall and cushion reinforcement . The results show that low weir Kiki rock variable modulus , the three typical cross-section of the weir body displacement are larger ; weir and the weir base minor principal compressive stress decreased with the increase with elevation in the cofferdam cushion the two cutoff wall near the joints existence phenomenon of stress concentration ; studies have shown that the reinforcement ratio should increase the cushion . Using strength reserve method to analyze the failure mechanism of various operating conditions the cofferdam three typical two-dimensional cross-section and three-dimensional whole and undermine development path , and ultimately determine the strength of the weir - reserve safety factor . Flood season water level , three-dimensional strength reserve method to get the overall factor of safety against sliding Kc = 1.80 4. Research on particle swarm optimization algorithm of this novel artificial intelligence search methods in engineering , and to apply in the cofferdam slope stability analysis of the subject . Demonstrated the practicality of the particle swarm optimization algorithm engineering .

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic engineering construction > A variety of engineering,types > Construction of diversion and the closure of cofferdam and excavation engineering > Cofferdam
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