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Large-Scale Test Model of the Progressive Deformation and Failure of cracked soil slopes

Journal of Earth Science 2020年第6期31卷 1097-1108页

作者： Zhi Zhou Jiaming Zhang Fulong Ning Yi Luo Lily Chong Kuangbiao Sun School of Engineering China University of GeosciencesWuhan 430074China Anhui Transportation Holding Group Co. Ltd.Hefei 230088China

A large-scale test bed(LWH=6 m×3 m×2.8 m)instrumented with various sensors is used to examine the effects of rainfall infiltration and evaporation on the deformation and failure of cracked soil slopes,taking the Anhui area along the Yangtze River as a field *** results indicate that(1)during rainfall,the soil around the shallow shrinkage fissures attains transient saturation,and the attendant decrease of matric suction is the primary cause of the shallow slope failure;(2)slope deformation continues during post-rainfall evaporation;(3)if a period of evaporation is followed by heavy rainfall,soil creep is concentrated near the deepest cracks,and two zones of steep gradients in pore pressure form at the crest and toe of the ***,a saturated zone forms near each crack base and gradually enlarges,eventually forming a continuous saturated layer that induces the slope instability or failure.

关键词： slope failure geological engineering cracked soil slope large-scale test progressive deformation

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Geometry and Maximum Width of a Stable slope Considering the Arching Effect

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Journal of Earth Science 2020年第6期31卷 1087-1096页

作者： Kun Fang Huiming Tang Xuexue Su Wentao Shang Shenglong Jia Faculty of Engineering China University of GeosciencesWuhan 430074China School of Civil Engineering Shandong Jianzhu UniversityJinan 250101China Faculty of Engineering University of AlbertaEdmonton ABT6G2R3Canada

The stability of an arching slope in deformable materials above strong rocks strongly depends on the shape and width of the *** for a free surface problem that incorporate these two parameters were derived using a simplified two-dimensional arching slope model,and were validated using physical model tests under 1 g and centrifugal *** results are used to estimate the maximum excavation width for a weak claystone slope in a lignite mine,for which we calculate a safety factor of 1.31.

关键词： slope failure geological engineering cracked soil slope large-scale model test deformation mechanism arching slope

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