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System Identification Method for Backcalculating the Voids Beneath Rigid Pavement Slabs Based on GPR

Author: LiZuoLin
Tutor: ZhangZuo；ZhongYanHui
School: Zhengzhou University
Course: Geotechnical Engineering
Keywords: Ground penetrating radar (GPR) Rigid Pavement Void System identification Inversion
CLC: U418.6
Type: Master's thesis
Year: 2010
Downloads: 65
Quote: 1
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Abstract


Void common diseases of cement concrete pavement , if not timely repair it , be pavement structural safety a serious impact , endangering the quality and safety of passage . The accurate the Void recognition is the premise and foundation repair its targeted . The use of ground penetrating radar (GPR) to detect the Void under Rigid Pavement Slab ground penetrating radar applications in recent years, the research focus . But due to the difficulties of the theoretical model and signal analysis , identification Void is still stuck in the exploratory stage . In this paper, more than the status quo , to study the inversion method based on the thickness of the ground penetrating radar under the rigid pavement Void , in order to attempt to study the quantitative identification of the Void . This paper studies the content and conclusions are as follows : (1) Based on the basic theory of radar waves , were established radar model the propagation of electromagnetic waves in a gas filled Void the Void road and water charge structure , synthesis gas charge and water according to the model simulation radar reflectivity signal charge Void pavement structure for further development of the inversion of rigid Pavement Slab Void parameters provide a rigorous theoretical model ; ( 2 ) based on the principle of system identification and sensitivity analysis , the basis of the forward model on Void thickness inversion under the rigid pavement system identification method , and the preparation of the corresponding program , to achieve efficient automation of the process of adjustment of the model parameters ; (3 ) for a rectangular cross-shaped and round three special off empty conditions , respectively, of its gas charge and the thickness of the water filled Void inversion . The evaluation results show that the inversion method to determine the thickness of rigid pavement Void feasibility . In this paper, based on the thickness of the Void ground penetrating radar under the rigid pavement quantitative judgment feasibility study , which provides a theoretical basis for further study of engineering in general shape Void quantitative identification .

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CLC: > Transportation > Road transport > Road works > Road maintenance and repairs > Road maintenance and repair
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