The Hungtsaiping landslides: From ancient to recent

Kuang Tsung Chang, Ming Lang Lin, Jia Jyun Dong, Chang Hai Chien

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A large and deep-seated landslide at Hungtsaiping was triggered by the 1999 Chi-Chi earthquake with the magnitude of 7. 3. Extensive site investigations for the landslide were conducted including field reconnaissance, geophysical exploration, borehole logs, and laboratory experiments. Thick colluvium was found around the landslide area and indicated the occurrence of a large ancient landslide. The Hungtsaiping area involves at least two large landslides events, an ancient rockslide and the 1999 colluvium slide. With the consideration of a source collapse mass, the two landslides in sequence are reasonably reproduced by the distinct element modeling. The modeling is calibrated by rock mass strength behavior through a procedure with the Hoek-Brown failure criterion, statistical experimental design, and optimization techniques. The mechanism of the 1999 landslide that cannot be revealed by the underground exploration data alone is clarified. The proposed procedure enables a rational and efficient way to determine micro-parameters for the distinct element modeling of landslides.

Original languageEnglish
Pages (from-to)205-214
Number of pages10
JournalLandslides
Volume9
Issue number2
DOIs
StatePublished - Jun 2012

Keywords

  • Colluvium
  • Distinct element modeling
  • Landslide
  • Site investigation

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