HR: 0800h
AN: G51A-0145    [Abstracts]
TI: Inter-comparison of multi-sensor results for high-speed rail risk analysis
AU: * Hung, W
EM: khung@itri.org.tw
AF: Industrial Technology Research Institute, Bldg. 24, 195 Sec.4, Chung Hsing Rd. Chutung. Hsinchu, Taiwan, Hsinchu, 310, Taiwan
AU: Hwang, C
EM: cheinway@mail.nctu.edu.tw
AF: Department of Civil Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 300, Taiwan, Hsinchu, 300, Taiwan
AU: Chang, C
EM: cpchang@csrsr.ncu.edu.tw
AF: National Central University, No.300, Jhongda Rd., Jhongli City, Taoyuan County , Taiwan, Taoyuan, 320, Taiwan
AU: Yen, J
EM: jyyen@csrsr.ncu.edu.tw
AF: National Central University, No.300, Jhongda Rd., Jhongli City, Taoyuan County , Taiwan, Taoyuan, 320, Taiwan
AU: Liu, C
EM: CHLiu@itri.org.tw
AF: Industrial Technology Research Institute, Bldg. 24, 195 Sec.4, Chung Hsing Rd. Chutung. Hsinchu, Taiwan, Hsinchu, 310, Taiwan
AB: The Taiwan high speed rail (THSR) is one of the most important national infrastructures. Because of its high speed, a stringent code of construction is demanded. To ensure a safe operation, the differential settlement rate of rail track should be less than 1/1000. Surface or underground subsidence will lead to failures of the foundations of rail structures and deformations of rail tracks. The effect of subsidence on the THSR structure varies with the depth of soil formation where consolidation (or groundwater withdrawal) occurs. If soil consolidation occurs above the bearing layer of the pile foundation, it will interact with the pile foundation and produce a negative skin friction, which reduces the pile bearing capacity and degrades the vertical capacity of the viaduct foundation. In the Yunlin County of Taiwan, a section of the THSR rail passes through an area undergoing significant subsidence (the current maximum rate is 10 cm/year). In an area close to the THSR, the cumulative subsidence between 1992 and 2006 is 100 cm. In order to monitor the subsidence along this section, an integrated sensor system, including INSAR, GPS, leveling and monitoring well, are deployed. INSAR will be used to map the 2-d surface deformation. Wells with observing rings at different depths are used to measure the compaction rates at various layers of strata. GPS receivers are mounted on pillars attached to the rail track to observe its vertical motion. A precision leveling network is established to measure the surface deformation. These sensors provide data revealing the surface and underground deformations around this area. This paper presents an inter- comparison of the deformations from these sensors and presents vital information for drafting a safety code for the THSR
DE: 1225 Global change from geodesy (1222, 1622, 1630, 1641, 1645, 4556)
SC: Geodesy [G]
MN: 2007 Fall Meeting