中国铁道科学2023，Vol.44Issue(6)：1-12,12.DOI:10.3969/j.issn.1001-4632.2023.06.01
反倾层状软岩切层滑坡空间形态与演化机制研究
Research on Spatial Morphology and Evolution Mechanism of Cutting-Layer Landslide in Anti-Dip Stratified Soft Rock
摘要
Abstract
To investigate the significance of the spatial morphological characteristics of landslide on the effective landslide renovation,this research takes a cutting-layer landslide in an anti-dip stratified soft rock along Lanzhou-Xinjiang Passenger Dedicated Line as the research object,fine tracking was carried out based on the landform and surface landmark features of the landslide.Combined with geomechanical analysis,the spatial morphological characteristics of the landslide perimeter and slope angle were studied.The local strength reduction method was used for finite element numerical simulation to restore the evolution process of landslide and analyze and predict its development trend.The results show that 12 groups of structural fracture planes can be formed under the unidirectional compression of principal stress of the structure NE80°∠20° in the landslide area.The folded-line-shaped back boundary of the landslide,the two sides of multi-segment lateral boundary are formed by the structural plane of multi-group shear and tension joints.The sliding surfaces of the 46° traction section and the 20° main section are formed by the first and second level shear sliding surfaces produced by gravity dislocation along the 70°-76° flexural surface.The landslide has the forming conditions which include soft rock slippery strata,weak structural plane(belt)along slope direction and groundwater reserve.The mechanical evolution mechanism can be summarized as strength softening,gravity diastrophism and shear sliding.The stability coefficients of the sliding surface strength were calculated from Fs=0.8-0.9 when the landslide experienced a sharp slide along the first shear outlet,and the internal friction angle of the sliding surface of the main sliding section is between 9.7-12.9 by inversion,thus obtaining that the stability coefficient was 1.15 after sliding along the second shear outlet,which was in a relatively stable state.关键词
切层滑坡/空间形态/地质力学/演化机制/数值模拟Key words
Cutting-layer landslide/Spatial morphology/Geomechanics/Evolutionary mechanism/Numerical simulation分类
交通工程引用本文复制引用
张玉芳,宋国壮,袁坤,邓胜,范家玮..反倾层状软岩切层滑坡空间形态与演化机制研究[J].中国铁道科学,2023,44(6):1-12,12.基金项目
青海省重点研发与转化计划项目(2022-SF-158) （2022-SF-158）
中国铁道科学研究院集团有限公司院基金课题(2023YJ219) （2023YJ219）
