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

作　　者：郭双枫 府金宇 张鹏 李宁[3] GUO Shuangfeng;FU Jinyu;ZHANG Peng;LI Ning(College of Transportation Engineering,Nanjing Tech University,Nanjing 211800,Jiangsu,China;Chongqing University Industrial Technology Research Institute,Chongqing 400039,China;School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,Shaanxi,China)

机构地区：[1]南京工业大学交通运输工程学院,江苏南京211800 [2]重庆大学产业技术研究院,重庆400039 [3]西安理工大学土木建筑工程学院,陕西西安710048

出　　处：《地震工程学报》2025年第3期542-553,共12页China Earthquake Engineering Journal

基　　金：江苏省自然科学基金青年基金项目(BK20230334);国家自然科学基金青年项目(42407258);重庆市自然科学基金面上项目(CSTB2024NSCQ-MSX1040)。

摘　　要：含软弱夹层顺层岩质边坡的稳定性是由软弱夹层和岩体共同控制的,而软弱夹层物理力学性质差,极易诱发顺层滑坡灾害。含控制断层顺层岩质边坡的失稳机制与破坏模式一直都是岩土工程领域中高度关注的问题。基于现场调查,以黄河上游某大型水电工程坝址区右岸顺层岩质边坡为例,利用有限单元直接求解边坡稳定性的方法建立模型,采用界面单元模拟结构面的摩擦滑动、张开和闭合,研究受F 27断层控制的边坡发生蠕滑-拉裂变形破坏的发育特征、成因机制及不同工况下变形体的稳定性态。结果表明:由顺层节理以及断层F 27所构成的潜在滑动面是控制边坡稳定性的关键因素。天然及暴雨状态下边坡整体处于基本稳定-欠稳定状态。地震及极端状态下,顺层节理和断层F 27相继延伸、扩展、贯通,形成蠕滑底边界,后缘发生拉裂变形破坏,导致坡体沿中-缓倾控制性结构面发生蠕滑-拉裂失稳破坏;边坡失稳后严重危害工程安全,需进行重点工程处理,并采取边坡加固措施。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 analyze 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-sliding deformation and failure controlled by the F 27 fault.Results show that the potential sliding surface formed by bedding joints and the F 27 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 F 27 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 measures.

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 

分 类 号：P642.2[天文地球—工程地质学]