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標題: Analysis of the Chiufengershan landslide triggered by the 1999 Chi-Chi earthquake in Taiwan
作者: Shou, K.J.
Wang, C.F.
關鍵字: Chi-Chi earthquake;landslide;back analysis;probability analysis;southwestern taiwan;slopes
Project: Engineering Geology
期刊/報告no:: Engineering Geology, Volume 68, Issue 3-4, Page(s) 237-250.
A disastrous earthquake rocked Taiwan on September 21, 1999, with magnitude M-L = 7.3 and an epicenter near the small town of Chi-Chi in central Taiwan. The Chi-Chi earthquake triggered landslide on the dip slope at the Chiufengershan. In this study, a review of the topography and geology of this area was followed by field investigations. Laboratory testing was applied to understand the geomaterial composing the slope. Then, based on a series of limit equilibrium analyses, the failure mechanism of this landslide and the risk of the residual slope were studied. According to the stability analyses, the pre-quake slope is quite stable, with factor of safety of 1.77 (dry) to 1.35 (full groundwater level); explaining why there is no written record of a landslide here for the past 100 years. In contrast, a back analysis shows that the Chi-Chi earthquake-induced dynamic loading is far more than the dip slope can sustain, due in part to the short distance to the epicenter. A Monte Carlo type probability analysis suggests that the residual slope is more dangerous than the pre-quake slope and needs more attention. (C) 2002 Elsevier Science B.V. All rights reserved.
ISSN: 0013-7952
DOI: 10.1016/s0013-7952(02)00230-2
Appears in Collections:土木工程學系所

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