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Case study on structural safety evaluation of existing multi arch tunnel

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Document pages: 11 pages

Abstract: Structural health assessment is one of the key activities to maintain the performance of tunnel during its service life. With the development of modern detection technology, the comprehensive evaluation system of structural health of operating tunnel is being established. In order to evaluate the actual operation state of shitigou tunnel, modern detection technologies such as crack width monitoring technology, concrete strength monitoring technology and electromagnetic wave nondestructive monitoring technology are used to comprehensively detect the lining cracks, tunnel leakage and lining voids. Through the statistical analysis of the test results, the distribution characteristics, development law and damage grade of structural defects are obtained. The tunnel lining crack is minly located on the middle wall; serious water leakage is encountered on the side wall, middle wall, and vault; the strength of foundation and liner structure of left tunnel does not meet the design requirement; the liner voids are mostly located at the tunnel entrance section, especially, on the tunnel vault; and the proportion of influence factors of structural defects should be considered. The research results presented for this study can serve as references for effective design and health assessment of existing multiarch tunnel projects.

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