An Experimental Study on the Hydromechanical Behaviours of the Evolution of Postearthquake Landslide Deposits

Autor: Huan Cai, Zong-Ji Yang, Li-Yong Wang, Xiao-Qin Lei, Xiao-Long Fu, Shi-Hao Liu, Jian-Ping Qiao
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Geofluids, Vol 2019 (2019)
Druh dokumentu: article
ISSN: 1468-8115
1468-8123
DOI: 10.1155/2019/3032494
Popis: In this study, a series of experiments of the full-scale physical model was employed to investigate the hydromechanical behaviours of the postearthquake landslide evolution, in forms of rill erosion and shallow headward failure on the rill bank slopes under unsaturated conditions. Soil-water characteristic curves (SWCC) were established using the Brooks-Corey (BC) and van Genuchten (VG) models. The stability of the shallow failure was then analyzed via a one-dimensional and unsaturated stability analysis model of the infinite slope. This measurement revealed that the preferential flow and the matrix flow coexisted when infiltration occurred and the VG model performs better in fitting the SWCC than the BC model. Consistent feedback between stability calculations and experimental observations enables the analysis of mechanisms of rill erosion and slope failure of postseismic landslide under the impact of preferential flow. Furthermore, the seepage-induced internal erosion phenomenon was observed in the experiment. This work thus provides a new perspective on the triggering mechanisms of debris flow during the postseismic period.
Databáze: Directory of Open Access Journals
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