Abstract
Shield tunneling is one of the most important technologies for building of underground engineering. Many grouting holes were prefabricated for the requirement of backfill grouting, which is easy to induce local damages and potential disasters, such as leakage and cracking. Accordingly, an integrated workflow for damage detection and stability evaluation was performed based on nondestructive testing (NDT) and numerical simulation. As a case study, this method was applied to an underwater shield tunnel. Firstly, Ground Penetrating Radar (GPR) was used to detect the conditions in grouting holes. Then, the infrared camera was used to determine the damaged positions induced by grouting holes. According to NDT results, the numerical models were developed to analyze the mechanical behaviors of structure. It indicated the geophysical inversion results are consistent with field conditions. The influence area increases with a significant value of water pressure, and stress magnitude would increase to 45KPa if the increment of water pressure reaches to 10KPa. As a promising application, structure stability was evaluated in the light of analytical results.
Highlights
Maintaining the stability of infrastructure is crucial to the development of national economy
An integrated workflow for damage detection and stability evaluation was performed based on nondestructive testing (NDT) and numerical simulation
The Proposed Workflow for Structure Stability Evaluation Based on the research statues and the background of the Nanjing Yangtze River, this study developed a framework for the local damage assessment of structure
Summary
Maintaining the stability of infrastructure is crucial to the development of national economy. In the past few years, a mass number of researches are focused on the instability prevention of structure [1]. For the shield tunnel, it is easier to suffer abnormal conditions because the complex structure and the existing of segment joints, such as leakage [2]. Many grouting holes were prefabricated in shield tunnels, and they were blocked off with special plugs and aged with time. In contrast to the previous studies, there are limited works about the detection of grouting holes and the investigation of local instability on the overall stability for an underground structure [3]. Based on the state-of-art for tunnel disasters prevention, the presented study focused on the development of an integrated workflow for local damages detection and its impact on structural stability using nondestructive testing (NDT) and numerical simulation
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