Earthquake-Induced Stress Amplification and Rock Fragmentation within a Deep-Seated Bedding Fault: Case Study of the Daguangbao Landslide Triggered by the 2008 Wenchuan Earthquake (Ms=8.0)
نویسندگان
چکیده
Abstract The 2008 Wenchuan Ms 8.0 earthquake triggered the Daguangbao (DGB) landslide, of which shear surface belongs to a thrust bedding fault 400 m below carbonate slope. After 1.8 km-long inclined sliding face (0.3 km2) was exposed in south source area. By using shaking table test, contributions landslide have been studied this paper. test model is simplified as weak layer with small elasticity and layers hard high elastic modulus, 296 times one. records larger displacement amplitude upper than that lower one pressure ones. We ascribed stress amplification time delay wave velocity only 1/15 layers. Such gives rise phase differences between during shaking. compressive occurs when moves downwards relative one; otherwise, tensile occurs. It suggested kind an extensive fragmentation rock mass earthquake, can be verified by good deal gentle-dip steep-dip cracks observed on site. proposed had caused fast dropping strength enhance suddenness DGB initiation.
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ژورنال
عنوان ژورنال: Lithosphere
سال: 2022
ISSN: ['1941-8264', '1947-4253']
DOI: https://doi.org/10.2113/2022/6387274