Li J Y,Luo Y H,Zhou Z,Nan K. 2024. Analysis of characteristics and failure mechanism of Paodili seismic landslide in Qingchuan County. Acta Seismologica Sinica,46(3):1−12. doi: 10.11939/jass.20230058
Citation: Li J Y,Luo Y H,Zhou Z,Nan K. 2024. Analysis of characteristics and failure mechanism of Paodili seismic landslide in Qingchuan County. Acta Seismologica Sinica,46(3):1−12. doi: 10.11939/jass.20230058

Analysis of characteristics and failure mechanism of Paodili seismic landslide in Qingchuan County

  • The problem of slope stability in high-intensity mountainous area is prominent. It is of great significance to study the relationship between geological structure and strata structure and the triggering mechanism of landslide under earthquake action. In this paper, the geological characteristics of the landslide in Qingchuan County are investigated, and the dynamic response and deformation and failure process of 1st landslide are analyzed based on discrete element software (UDEC). The field investigation shows that the slope of Paodili 1st has a near-horizontal “upper-hard, lower-soft” stratigraphic structure, in which faults pass through the back edge of the slope. The lithologic zonation of landslide deposits shows that the lower phyllite of Paodili 1st was destroyed earlier than the upper siliceous rock, and the broken time was earlier than 2nd and 3rd. The numerical simulation study reveals that the peak acceleration amplification effect is strongest in phyllite near the fault zone, with an amplification factor of 6.79. This leads to the lower phyllite first experiencing tensile failure along the steep dip surface, then the upper siliceous rock mass produced tension failure. The results are in good agreement with the characteristics of the deposits in the field investigation. The dynamic response, deformation, and failure of the landslide are controlled by the fault and the hard and soft strata structure. This study can provide a reference for seismic landslides evaluation in regions characterized by faulting and “upper-hard, lower-soft” strata.
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