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Study on the Structure of Heavy-duty Cement Concrete Pavement for Resisting the Extra-heavy Load Traffic

Author: NieMin
Tutor: LiYueGuang
School: Wuhan University of Technology
Course: Road and Railway Engineering
Keywords: Special heavy load traffic Cement Concrete Pavement Finite Element Analysis
CLC: U416.216
Type: Master's thesis
Year: 2011
Downloads: 70
Quote: 0
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Abstract

Especially heavy load transport refers to transport specific cargo with special requirements, axle load exceeds a certain limit traffic, such as nuclear power plant, generator rotor and stator, chemical synthesis reactor is not removable load oversized cargo. Without the reinforcement of the existing cement concrete pavement in especially heavy traffic load, it will produce a variety of damage, such as squirt mud, dislocation and fracture. Research especially heavy load traffic characteristics, analysis of stress distribution of cement concrete slab roads especially heavy load on the prevention and treatment of various diseases, improve the performance of road use, extend road life of great significance. In this paper, by analyzing the characteristics of the especially heavy load traffic, especially heavy load traffic defined and given special heavy load traffic axle load limit formula. The study is divided into three parts: 1) analysis of cement concrete pavement early damage, for special heavy load traffic characteristics, pointed out that the unique failure mode of especially heavy load traffic road. Especially heavy load traffic accelerated and intensified the destruction of erosion damage and wear. Erosion damage caused by the most important reason for the broken plate, with the broken plate destruction complement each other and promote each other, thereby causing the pavement transverse cracks, longitudinal cracks and crack Net generation. 2) taking into account especially heavy load transport axis axle load, finite element analysis, taking into account the concrete slab stress distribution and deflection control two aspects to determine the plate worst load position; using the finite element analysis of different board thick and Kiki top resilient modulus of the concrete slab under stress variation. Especially heavy traffic load can be divided into two types of concentrated loads and intensive loads, concentrated loads and intensive loads the most unfavorable load position is located at the corner of the concentrated load in the same circumstances than intensive load caused board bottom stress large. 3) Concrete sheet thickness increases to reduce the bottom of the plate. Tensile stress effect is obvious, increased to radical top equivalent modulus of elasticity for reducing the bottom of the plate tensile stress effect is not obvious. Increase the thickness of the selection of better strength, the foundation of a strong anti-erosion ability to reduce concrete slab bottom stress, to extend the life of especially heavy load transport concrete pavement. By finite element analysis, to draw especially heavy load traffic under the concrete slab reasonable thickness of 0.42-0.50 m. 4) analysis of especially heavy loads heavy cement concrete pavement temperature stress, and summed up the length and width of different combinations of pavement slab temperature stress law. Ordinary concrete sheets 6 meters in length when the maximum temperature stress, especially heavy load transport cement concrete slab temperature stress plate length and plate width increase linearly This paper analyzes based on reasonable plate size range: length 4 -5 meters wide and 3.5-4 m.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Cement concrete pavement
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