Back-analysis of Donghekou landslide using improved DDA considering joint roughness degradation

Autor:	Fu Haiying, Lianheng Zhao, Chenlin Xiang, John X. Zhao, Pan Wang, Jinmei Wang, Yingbin Zhang, Wang Qingdong, Yan-long Chen
Rok vydání:	2021
Předmět:	021110 strategic defence & security studies business.product_category 0211 other engineering and technologies Landslide Fracture mechanics 02 engineering and technology Geotechnical Engineering and Engineering Geology Displacement (vector) Geotechnical engineering Direct shear test Inclined plane business Shear strength (discontinuity) Joint (geology) Discontinuous Deformation Analysis Geology 021101 geological & geomatics engineering
Zdroj:	Landslides. 18:1925-1935
ISSN:	1612-5118 1612-510X
DOI:	10.1007/s10346-020-01586-1
Popis:	Currently, the dynamic behavior of high-speed long-runout landslides triggered by earthquakes remains unclear due to the complexity of such phenomena. Degradation in the shear strength of rock masses is considered a primary factor contributing to the high velocities and long runout distances of these landslides. In this study, the strength degradation induced by changes in rock joint morphology is analyzed considering a numerical model of the Donghekou landslide, by using discontinuous deformation analysis (DDA). First, an exponential joint roughness degradation function (i.e., JRCm) that depends on displacement is incorporated with the nonlinear Barton–Bandis (B–B) shear strength criterion, and this modified B–B criterion is combined with the DDA. Moreover, a virtual joint is introduced in the DDA to model the propagation of cracks in intact rock masses, in order to simulate the dynamic phenomenon of earthquake-induced landslides. Subsequently, this improved DDA (IDDA) is validated via simulations of a shear test and a sliding block over an inclined plane. Finally, the IDDA is employed to simulate the Donghekou landslide, which was induced by the 2008 Wenchuan earthquake in China. Furthermore, the entire dynamic process of the landslide, including crack propagation, instability, initiation, and motion, is depicted. The simulated deposit patterns obtained via the IDDA are in good agreement with the results of field investigations. The simulation results also prove that the IDDA can reflect key movement behaviors of Donghekou landslide and that the degradation of rock joints significantly influences the long runout distance and high velocity of sliding mass.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4b4cc5c6f0048d1bfbf026ef3c0d2fe5 https://doi.org/10.1007/s10346-020-01586-1 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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