Structure Capacity Evaluation for Utility Cuts
Date Issued
2016
Date
2016
Author(s)
Lin, Yi-Chun
Abstract
Utility pipelines are essential facilities and most of them are separately placed underneath the urban roads in Taiwan. To install and maintain, pavement is repeatedly cut and excavated. In the consequence, the pavement service performance is impacted seriously and the pavement management becomes a challenge. To overcome this problem, Taiwan Executive Yuan promoted the Road Smoothing Project and requested each city/county municipal government must set the standards for requiring the minimum depth of pipeline, the quality of refill material, and the construction process. However, the results were not very effective. The pavement distresses related to utility cuts, such as the reflection cracking in the cut interface and the alligator cracking in the repair area, still appear frequently. This paper presents a study of using Light Weight Deflectometer (LWD) to establish an inspection method to evaluate the influence of utility cuts in pavement structural capacity. The appropriate combination of drop height and load plate size of LWD, the templates of testing points, and inspection procedure were studied and recommended. Temperature adjustment model of the LWD test result was also developed by field tests in this research. In this study, seven in situ utility cuts constructions were conducted the LWD test in three stages, i.e. before utility cuts, after temporary repair, and after formal milling and overlay repair. In addition, four of them did the extra LWD test every two months after formal milling and overlay repair for about half year. According to the test results, the original structure capacity E_LWD were about 400 to 800 MPa, and the structure capacity E_LWD after utility cuts construction became 1200 to 1800 MPa due to using the Controlled Low Strength Materials (CLSM) as refilling materials. Moreover, the Finite Element (FEM) model of this inspection method were created to simulate the LWD tests.
Subjects
Utility Cuts Construction
Structural Capacity
Light Weight Deflectometer (LWD)
Temperature Adjusted model
Pavement Maintenance Management
Type
thesis
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