![]() They deduct from the test results that earthquake vibration brings about transient load to the weak layer of the slope, so the weak intercalated layer suffers not only greater compression force but also greater tensile force (more than 30 times that on upper and lower hard layers). ![]() have conducted 12 shaking table tests on the block model with saturated soft intercalated layer 7, 8. 6 find that vertical shaking makes great contributions to DGB landslide according to the discontinuous deformation analysis (DDA) results. discovers that horizontal seismic acceleration could promote the release of steep vertical plane of the Landslide 3. By FLAC 3D process simulation, Yin et al. Huang has carried out research on the DGB landslide first and proposes that the landslide is the coupling result of earthquake, geology and landform 2. To the south of its sliding source area, there is a 1.8 km long (in sliding direction) oblique shear face with the area of 0.3 km 2. ![]() It is concluded that low friction feature of fault materials caused by the influence of groundwater is the main reason for destabilization of DGB landslide.ĭGB landslide is the largest landslide triggered by the 2008 Ms8.0 Wenchuan Earthquake, of which the area is 7.1 km 2, maximum accumulative thickness about 600 m, length 4.6 km, width 3.7 km and estimated volume 12 × 10 8 m 3 1. In saturated undrained dynamic shear conditions, fault internal friction angle could be reduced to 23.1° and 4.2°. In saturated undrained cases, shear strength of fault materials could drop to 9.7°, with S3 down to 0. Both mylonitic materials and breccia materials are strong in liquefying. Compared with argillaceous materials in the same fault, the mylonitic materials are of higher shear strength and internal friction angle. The lower fragmentation degree the more obvious strain softening characteristics of materials, the higher fragmentation degree the poorer shearing resistance of materials. Shearing strength of interlayer fault materials is related to fragmentation degree of structure. The test results show that fault material cohesion ranges from 20 to 320 kPa and internal friction angle from 15° to 41°. Different kinds of materials in the interlayer fault of DGB landslide are taken for direct shear test, medium scale shear test, in-situ shear test and ring shear test. After the landslide, a 1.8 km long (in the sliding direction) oblique shear face is exposed. Daguangbao (DGB) Landslide (12 × 10 8 m 3) is the largest landslide triggered by the 2008 Ms8.0 Wenchuan Earthquake, in which basal shear failure develops on an interlayer fault at 400 m deep under the ground.
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