https://scholars.lib.ntu.edu.tw/handle/123456789/576085
標題: | Quantified features of field monitoring from a mountain tunnel before and after reinforcement | 作者: | Chiu Y.C Wang T.T. TAI-TIEN WANG |
關鍵字: | Deformation; Linings; Maintenance; Monitoring; Railroad tunnels; Characteristic matrices; Displacement modes; Image mosaic technologies; Micro displacement; Operational tunnel; Safety evaluations; Standard procedures; Tunnel maintenances; Reinforcement | 公開日期: | 2020 | 來源出版物: | ISRM International Symposium - EUROCK 2020 | 摘要: | After completion, a structure enters its operational stage, and maintenance initiates. A standard procedure of maintenance and management includes monitoring and safety evaluation based on interpretation of monitoring results. Ideal tunnel maintenance procedures are hard to deliver because of the difficulties in connecting monitoring results and the causes. In recent years, novel technology has helped the administration collect massive monitoring data of operational tunnels. The crucial obstacle lies ahead now is how to define the integrity of a tunnel according to the monitoring results. Since 2009, a mountain tunnel in southeast Taiwan have been monitored through self-developed tunnel lining micro-displacement monitoring and image-mosaic technology. By the end of 2011, the lining displacement and crack monitoring showed that the degradation started to accelerate. Reinforcement is then conducted on some seriously deformed area in 2012. This manuscript introduces results analysed from tunnel displacement through characteristic matrix method. Characteristic matrix method is an approach established to analyse displacement of tunnel profiles. The method disassembles displacement of a tunnel profile into the sum of several displacement modes. There are two categories of displacement modes, rigid-body-motion type that includes translation and rotation, and deformation-type that comprises uniform, elliptic, triangular, square deformation, and other polygonal deformation. Distinct differences were found between the lining displacements before and after reinforcement. Before the reinforcement, the tunnel degrades as time goes by. In the meanwhile, the composition of higher degree deformation-type modes, square and pentagonal deformation, increases. After the reinforcement, lower degree deformation-type modes dominate, and higher degree deformation-type modes diminish. ? International Society for Rock Mechanics and Rock Engineering Norwegian Group for Rock Mechanics |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097629778&partnerID=40&md5=4bb15216f05a80ab65de4bb8cb769a4e https://scholars.lib.ntu.edu.tw/handle/123456789/576085 |
顯示於: | 土木工程學系 |
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