HR: 0800h
AN: MR31C-0528    [Abstracts]
TI: Development of Techniques for Subsidence Estimation Considering the Bulking Factor of Rock Mass
AU: Lee, H
EM: lhj3601@kangwon.ac.kr
AF: Kangwon National University, 192-1 Hyoja-2 Dong, Chuncheon, 200-701, Korea, Republic of
AU: * Choi, S O
EM: choiso@kangwon.ac.kr
AF: Kangwon National University, 192-1 Hyoja-2 Dong, Chuncheon, 200-701, Korea, Republic of
AB: Since 1990s, the surface subsidence in an abandoned mine area has been dealt as a serious public problem in Korea. In order to minimize the damage from the subsidence, many researchers have continued their researches about the mechanism of subsidence, the restoration of subsidence area, the compensation for a public welfare, etc. The great part of researches on the subsidence has been performed by numerical study. In these cases, the physical properties of rock masses and the dimension of gangway were used for major input data. The volumetric expansion ratio of rock mass according to the collapse of roof in gangway has never been used for major input data in numerical studies. When the bulking factor of rock mass is overlooked in numerical study, the mined-out area will be considered as an empty space rather than a filled space which is piled up high with the broken rocks in the gangway. Therefore the new estimation techniques for subsidence considering the bulking factor of rock mass would be reapplied to the studied area to check whether the amount of subsidence has been overestimated or not. In this study, most popular types of rock mass in Korea have been chosen for obtaining their bulking factors. Gneiss, granite, shale and limestone have been crushed in laboratory. After the particle size distribution, each particles were piled up and the bulking factors were identified with every steps; naturally stacked step, well interlocked step, and particle squeezed step in which the rock mass behaviors like a new intact rock. With the bulking factor of rock mass, the subsidence area will be re-estimated and their results would be used for generation of geo-hazard map in Korea. Key Words: subsidence, bulking factor, geo-hazard map.
DE: 5120 Plasticity, diffusion, and creep
DE: 8099 General or miscellaneous
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting