摘要
弯曲倾倒破坏是反倾岩质边坡中常见的破坏模式,而倾倒变形可能导致坡体发生多级折断。为研究这种现象,通过大型离心模型试验分析弯曲倾倒多级折断的突变特征,并基于突变理论建立多级折断的预测模型,以验证模型的合理性。研究结果显示,反倾岩质边坡倾倒变形是一种累积应变能的过程,并通过折断破坏来释放应变能;根据突变特征,发生多级折断的反倾边坡可以分为无影响区、叠合倾倒区、缓倾结构面影响区和变形区。在叠合倾倒区,岩层的多级折断破坏深度逐渐增加,而在缓倾结构面影响区,折断面基本与缓倾结构面一致;采用突变理论分析叠合倾倒区的多级折断深度,计算结果与离心试验结果相符。研究成果对于该类边坡稳定性和破坏机制提供了理论支持。
Toppling and flexural failure are prevalent modes of destabilization in anti-dip rock slopes,with toppling deformation potentially leading to multi-stage fractures within the slope mass.To investigate this phenomenon,a comprehensive study was conducted utilizing large-scale centrifuge model tests to analyze the catastrophic characteristics of flexural toppling and multi-stage fractures.Furthermore,a predictive model for multi-stage fractures was established based on catastrophe theory,and its rationality was validated.The research findings reveal that the process of toppling deformation in anti-dip rock slopes involves the accumulation of strain energy,which is subsequently released through fracture and failure.According to the catastrophic characteristics observed,antidip slopes undergoing multi-stage fractures can be categorized into distinct zones:a non-affected zone,an overlapping toppling zone,a zone influenced by gently inclined structural planes,and a deformation zone.Within the overlapping toppling zone,the depth of multi-stage fractures progressively increases,whereas in the zone influenced by gently inclined structural planes,the fracture planes generally align with these structural planes.By applying catastrophe theory to analyze the multi-stage fracture depth within the overlapping toppling zone,the computational results concurred with those obtained from the centrifuge tests.These research outcomes provide theoretical underpinnings for understanding the stability and failure mechanisms of such slopes,offering valuable insights into their behavior and potential for mitigation strategies.
作者
赵天丞
魏玉峰
国鸿圆
梁彭
金磊磊
ZHAO Tiancheng;WEI Yufeng;GUO Hongyuan;LIANG Peng;JIN Leilei(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China;College of Water Resource and Hydropower,Sichuan University,Chengdu,Sichuan 610065,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2024年第S02期3748-3758,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(42072303)
关键词
边坡工程
反倾层状岩质边坡
弯曲倾倒破坏
突变理论
离心模拟试验
slope engineering
anti-dip bedded rock slope
bending and tipping failure
catastrophe theory
centrifugal simulation test
