Strengthening the rigidity of landslide materials measured by seismic interferometry

Keng Hao Kang, Wei-An Chao*, Che Ming Yang, Ming Chien Chung, Yu Ting Kuo, Chih Hsiang Yeh, Hsin-Chang Liu, Chun Hung Lin, Chih Pin Lin, Jyh-Jong Liao, Jui Ming Chang, Yin Jeh Ngui, Chien Hsin Chen, Tung Lin Tai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Landslides have caused extensive infrastructure damage and caused human fatalities for centuries. Intense precipitation and large earthquakes are considered to be two major landslide triggers, particularly in the case of catastrophic landslides. The most widely accepted mechanistic explanation for landslides is the effective-stress dependent shear strength reduction due to increases in pore water pressure. The Chashan landslide site, selected for the present study, has been intensively studied from geological, geophysical, geodetic, geotechnical, hydrological, and seismological perspectives. Our seismic monitoring of daily relative velocity changes (dv/v) indicated that landslide material decreases coincided with the first half of the rainy period and increased during the latter half of the rainy period. The geodetic surveys before and after the rainy period identified vertical subsidence without horizontal movement. The results from the multidisciplinary investigation enabled us to draw a conceptual model of the landslide recovery process induced by water loading. Where all sliding materials were stable (safety factor > 1.0), unconsolidated landslide colluvium and impermeable sliding surfaces trapped the seepage water to form a water tank, provided that compact forces were acting on the materials below the sliding boundary. The vertical force of compaction facilitates an increase in the cohesion and strength of landslide materials, thereby increasing the landslide materials’ stability. We demonstrated that the recovery process periodically occurs only under the combined conditions of prolonged and intense precipitation and the related stability conditions.

Original languageAmerican English
Article number2834
Pages (from-to)1-17
Number of pages17
JournalRemote Sensing
Volume13
Issue number14
DOIs
StatePublished - 2 Jul 2021

Keywords

  • landslide recovery process
  • relative velocity changes
  • water loading

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