摘要
针对顺层边坡岩体结构的初始缺陷特征和非完善特性,应用初始后屈曲理论和突变理论探讨了边坡岩体结构的不稳定性态。根据边坡岩体在临界状态下的临界载荷和分岔状态下的分岔载荷,分别建立了边坡岩体的离层方程和溃屈方程,给出了边坡岩体溃屈破坏和剪切滑动的判据,并以雅砻江下游的霸王山边坡为例给出了工程实例。研究结果表明,边坡岩体的初始缺陷在分岔状态下表现为系统跨越分岔时的载荷增量;边坡岩体的非完善特性表现为其初始缺陷致分岔状态偏离了临界状态;只有当顺层边坡岩体各区域的发育同时满足离层方程或溃屈方程时,边坡才会出现屈曲或溃屈。
In accordance with the original defect and imperfection characteristics of the rock mass structure of bedding slopes,this paper studied the instability behavior of rock mass bedding slope by using the initial post-buckling theory and the cusp catastrophic model,which derived the separation equation and buckling failure equation of rock mass bedding slope according to the critical load in a critical state and the bifurcation load in a bifurcation state,built the criteria of the buckling failure and shearing slip for rock mass bedding slope,and presented an application with the example of Bawang mountain slope located in the lower reaches of the Yalu River.The results indicate that the original defect of rock mass bedding slope in a state of bifurcation turn out to be the incremental load through bifurcation set,the imperfection character itself of rock mass bedding slope decides the deviations between the bifurcation state and the critical state,the buckling or buckling failure will occur only if the development of each bedding slope area meets its separation equation or buckling failure equation.
作者
陈笑楠
张慧梅
CHEN Xiaonan;ZHANG Huimei(Department of Mechanics, Xi’an University of Science & Technology, Xi’an, Shaanxi 710054, China)
出处
《中国地质灾害与防治学报》
CSCD
2020年第1期30-35,共6页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金(11172232,51774231)
陕西省重点科技创新团队计划(2014KCT-30)
关键词
顺层边坡
初始缺陷
非完善屈曲
分岔载荷
溃屈破坏
剪切滑动
bedding slopes
original defect
imperfection buckling
bifurcation load
buckling failure
shearing slip
