双层土质滑坡临界滑动面判识与失稳机理研究  

Study on Identification of Critical Sliding Surfaces and Instability Mechanisms of Doublelayered Soil Landslides

作　　者：郭双枫 何嘉元 张志华 张鹏 李宁[4] 朱锐 GUO Shuangfeng;HE Jiayuan;ZHANG Zhihua;ZHANG Peng;LI Ning;ZHU Rui(College of Transportation Engineering,Nanjing Tech University,Nanjing 211800,China;Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan 430010,China;Research Center on Mountain Torrent&Geologic Disaster Prevention,Ministry of Water Resources,Wuhan 430010,China;School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,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]长江水利委员会长江科学院,湖北武汉430010 [3]水利部山洪地质灾害防治工程技术研究中心,湖北武汉430010 [4]西安理工大学土木建筑工程学院,陕西西安710048

出　　处：《防灾减灾工程学报》2024年第5期1020-1029,共10页Journal of Disaster Prevention and Mitigation Engineering

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

摘　　要：研究层状土质边坡的临界滑动面和失稳机制是岩土工程中经典的研究课题。聚焦引起边坡失稳破坏的不同诱发机制和触发因素,关注边坡的破坏模式和失稳过程,有利于提供更具针对性的加固措施。针对岩土工程中常见的非均质边坡,研发了适合双层土质边坡的有限元程序。研究了土坡在不同几何形态下,稳定性态、临界滑动面位置、失稳模式及破坏机制的演化规律;推导了非均质土坡的安全系数FS与土体特性和几何形态之间的内在函数关系式;提出了双滑面失稳机理与临界强度比的概念,给出了边坡稳定性态与失稳破坏的临界转折点和双滑面失稳的判别准则;揭示了双层不排水边坡的破坏机制,建立了不排水边坡稳定性态和失稳机理的相关设计图表。工程验证表明,计算所得的边坡稳定数及稳定状态与工程实际非常接近,该运算程序能够精准快速地判定潜在临界滑动面,准确评估边坡破坏机制,为双层土质边坡稳定性分析提供了新的思路和途径。The identification of critical sliding surfaces and instability mechanisms in layered soil slopes is of great significance in geotechnical engineering.This research focuses on providing more targeted reinforcement measures by examining different inducing mechanisms and triggering factors responsible for slope instability,while also analyzing the failure modes and destabilization processes.A finite element program was developed specifically for double-layered slopes commonly found in geotechnical engineering to study the evolution of stability behavior,critical sliding surface position,instability modes,and failure mechanisms under different geometric conditions.The intrinsic functional relationships between the safety factors F_(S),soil properties,and geometric shapes of non-homogenous slopes were derived.The study introduced the concept of double-sliding surface instability mechanisms and critical strength ratios,and defined the critical transition points between slope stability and instability,along with the criteria for identifying double-sliding surface instability.Additionally,the failure mechanisms of double-layered undrained slopes were revealed,and design charts related to stability and instability mechanisms were established.The research concludes that the calculated slope stability numbers and stability conditions closely align with engineering practice.The computational program enables quick identification of potential critical sliding surfaces and accurate evaluation of slope failure mechanisms,providing novel insights and approaches for the stability analysis of double-layered soil slopes.

关 键 词：双层土质边坡 稳定性态 临界滑动面 失稳机理 临界强度比 演化规律 

分 类 号：P642[天文地球—工程地质学]