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顺层岩质滑坡形成机制试验研究

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顺层岩质滑坡形成机制一直是滑坡研究的重点和难点.为研究顺层岩质滑坡演化过程及失稳机制,构建理想概化模型;开展冰冻试验,结合数字图像相关(DIC)方法对顺层岩质滑坡全过程进行非接触式、实时变形观测.基于DIC计算所得的全场变形数据,提出一种精细化描述顺层岩质边坡后缘张开段和剪切滑移段相对位移演化规律的方法.研究表明:顺层岩质滑坡在失稳过程中经历了初始变形、后缘张开、剪切滑移、整体贯通4个阶段.应变局部化带最先产生于后缘张开段浅部,而后从浅部向深部发展至潜在滑带后缘,并从后缘不断向前缘发展,最后贯通导致整体发生失稳破坏,展现出由浅部到深部、由后缘向前缘、由局部到整体的演化特征.此外,讨论了滑带倾角对顺层岩质边坡失稳的影响规律,发现失稳时间随滑带倾角的增加而缩短.基于DIC监测的研究方法为量化揭示顺层岩质滑坡形成机制提供一种新的思路.
Experimental study on formation mechanism of bedding rock landslide
The main focus and challenge of landslide research is always the formation mechanism of bedding rock landslides.An ideal generalized model was created to investigate the progression and instability mechanism of bedding rock landslides.In addition to using the digital image correlation(DIC)approach,a freezing experiment was conducted for non-contact and real-time deformation observation throughout the experiment for the entire process of a bedding rock landslide.A method was proposed to finely describe the relative displacement evolution of the opening section of side slope rear edge and the shear slide section of the bedding rock landslide,based on the full-field deformation data derived by DIC.The findings indicate that there are four stages in the instability process that the bedding rock landslide goes through:early deformation,rear edge opening,shear sliding and overall instability.Prior to reaching the rear edge of the possible sliding zone,the strain localization band is initially produced at the shallow area of the rear edge opening section and subsequently proceeds to the deeper part.Following that,they keep going in the direction of the sliding zone's front edge,finally passing through it and reaching the failure of overall instability.These occurrences demonstrate the characteristics of progression from shallow to deep,from the rear edge to the front edge and from local to global.Furthermore,the impact of the sliding zone dip angle on the instability of bedding rock side slope was investigated,and it was found that an increase in the sliding zone dip angle shortens the instability time.The research methodology based on DIC monitoring provides a new way to revealing the progression mechanism of bedding rock landslides through quantitative means.

slope engineeringbedding rock landslidefreezing experimentdigital image correlation(DIC)strain localization bandrelative displacement evolutionquantification

张科、狄巍、张凯

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昆明理工大学电力工程学院,云南昆明 650500

昆明理工大学建筑工程学院,云南昆明 650500

边坡工程 顺层岩质滑坡 冰冻试验 数字图像相关 应变局部化带 相对位移演化 量化

国家自然科学基金资助项目云南省应用基础研究计划项目

119021282019FI012

2024

10.13722/j.cnki.jrme.2022.1281

岩石力学与工程学报
中国岩石力学与工程学会

岩石力学与工程学报

CSTPCD北大核心
影响因子：2.589
ISSN：1000-6915
年,卷(期)：2024.43(z1)