Deformation and failure evolution mechanism of valley slope induced by dominant crack propagation: Insights from transparent soil modelling

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology Pub Date : 2025-03-13 DOI:10.1016/j.enggeo.2025.108019

Xianlun Leng , Chuan Wang , Chengtang Wang , Zhanrong Zhang , Ruirui Wang , Kun Fang

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引用次数: 0

Abstract

Rock slope failures occur frequently in mountainous regions. However, research on the internal deformation and failure evolution mechanism of fractured valley rock slopes caused by dominant crack propagation remains limited. To address this knowledge gap, this study used the bank slope of the newly constructed Nujiang Grand Bridge as a prototype to perform model tests on slopes with dominant cracks at the slope top (M₁ model) and slope toe (M₂ model) utilizing a self-developed visualized model experiment system. Experimental data from the top load and displacement cells, along with the Particle Image Velocimetry (PIV) technique, were utilized to analyze the load-displacement response curves, displacement, velocity, strain rate fields, and propagation characteristics of the dominant crack in the slope. The results indicated that: (1) the load-displacement curves for both M₁ and M₂ models could be divided into four stages: slow acceleration, approximately uniform increase, slow deceleration, and rapid decline. The ultimate bearing capacity of the M₂ model was about 3.2 kN larger than that of the M₁ model. (2) The deformation and failure process of the slopes in both models could be categorized into three stages: initial deformation, rapid deformation, and failure. The M₁ and M₂ models exhibited “thrust-type” and “retrogressive” landslide failure characteristics, respectively. (3) The length of the dominant crack propagation segment increased exponentially with increasing loading duration, and the slope deformation showed obvious zonal characteristics. (4) The comparison of deformation and failure characteristics between the model and prototype slopes validated the rationality and accuracy of the model test. This study offers valuable insights into the internal deformation and failure evolution mechanism of fractured valley slopes resulting from dominant crack propagation.

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来源期刊

Engineering Geology 地学-地球科学综合

CiteScore

13.70

自引率

12.20%

发文量

327

审稿时长

5.6 months

期刊介绍： Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.