地震工程学报2025，Vol.47Issue(3)：542-553,12.DOI:10.20000/j.1000-0844.20231008003
断层控制的蠕滑型顺层岩质滑坡变形破坏机制与失稳模式
Deformation-damage mechanism and failure mode of creeping bedding rock landslides controlled by faults
摘要
Abstract
The stability of bedding rock slopes with weak interlayers is influenced by the combined effects of the weak interlayers and the surrounding rock mass.Owing to the poor physical and mechanical properties of weak interlayers,these slopes are highly susceptible to bedding landslide disasters.The instability mechanisms and failure modes of bedding rock slopes controlled by faults remain a critical concern in geotechnical engineering.This study investigates a bedding rock slope located at the right bank of a large hydropower project dam site in the upper Yellow River region based on field investigations.A finite element direct solution model was developed to ana-lyze slope stability,incorporating interface elements employed to simulate the frictional sliding,opening,and closing of structural planes.The study examines the deformation characteristics,causative mechanisms,and stability of the slope under various conditions,focusing on creep-slid-ing deformation and failure controlled by the F27 fault.Results show that the potential sliding sur-face formed by bedding joints and the F27 fault is the dominant factor controlling slope stability.Under natural and rainstorm conditions,the slope transitions from a state of basic stability to marginal instability.Under seismic and extreme conditions,progressive extension and expansion of bedding joints and the F27 fault form a creeping bottom boundary.Tensile cracking deformation and failure occur at the trailing edge,leading to creep-tensile cracking failure along moderately to gently inclined structural planes.The slope instability poses severe threats to engineering safety,emphasizing the urgent need for targeted engineering treatments and slope reinforcement meas-ures.关键词
顺层岩质边坡/控制性断层/蠕滑-拉裂/失稳机制/变形破坏模式Key words
bedding rock slope/controlling fault/creep-tensile cracking/instability mechanism/deformation and failure mode分类
地质学引用本文复制引用
郭双枫,府金宇,张鹏,李宁..断层控制的蠕滑型顺层岩质滑坡变形破坏机制与失稳模式[J].地震工程学报,2025,47(3):542-553,12.基金项目
江苏省自然科学基金青年基金项目(BK20230334) （BK20230334）
国家自然科学基金青年项目(42407258) （42407258）
重庆市自然科学基金面上项目(CSTB2024NSCQ-MSX1040) （CSTB2024NSCQ-MSX1040）
