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Research on Cement Concrete Overlay Stress Analysis and Cracking Prediction in the Rubblization of Old Cement Concrete Pavement

Author: LvJiangFeng
Tutor: ZhangHongLiang
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Cement Concrete Pavement Rubblization Traffic load Temperature gradient Void Structural stress ABAQUS Stress intensity factor Cracking estimate
CLC: U416.216
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 0
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Abstract


At present, China has a large number of old cement concrete pavement has been close to or exceeded its design life, widespread damage has occurred or will soon appear in the rapid development of the use of road transport demand must be rebuilt or overhaul. The rubble of an old cement concrete pavement broken Treatment Technology, overhaul or renovation of old cement concrete pavement, an important means of good because it has the effect of anti-reflective cracking, fast construction, environmental and traffic impacts of the advantages of small widely used. But the research and application of domestic of Rubblization technology is not very mature, domestic need to do a systematic study of the rubble of the technology and its overlay structure, has important theoretical value and practical significance. Thesis refers to a large number of domestic and international layer of gravel structure model, drawing on existing gradient of humidity and temperature gradients research methods, nonlinear temperature distribution into a linear temperature distribution, humidity gradient transformation for the calculation of the temperature gradient method. On this basis, the combination the rubble of structural layer, different structural layer modulus characterization Rubblization introduced the spring element simulation seams and road panel with hard shoulders load transfer through the ABAQUS finite element software, according to Chong Luo road test section of the road structure Ⅲ establish the bottom of the plate. Void and the Void simulation model to analyze the impact of various parameters on the rubble of the old cement road cement concrete overlay structure stress. Consider to concrete overlay layer thickness, void size gravel layer lower modulus joint load transfer coefficient and the temperature gradient changes, given the rubble after the old cement road cement concrete overlay in the vehicle load, humidity and temperature gradients under stress analysis of the the nomogram given the the query design case, and the fatigue damage estimated program. With the stress intensity factor of the pavement fracture mechanics theory and finite element simulation model of whether Rubblization technology cement concrete pavement overlay slowed reflective cracking under the rubble of the old cement road cement concrete overlay structure and load characteristics the effect of doing the study, and the old cement gravel road cement concrete overlay fracture mechanism was analyzed. Hammerhead gravel construction process parameters and construction process, based on the test results of the test road test pavement structure mechanical model test and the test results are combined with the actual situation, in order to reflect more realistically the stress of the pavement structure.

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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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