摘要
软岩强度低、易变形,受湿、热、力等因素影响极易发生崩解,进而导致边坡失稳破坏。许多学者对软岩崩解机理、强度劣化规律以及边坡稳定性进行了研究。为总结现有研究成果,深化对软岩边坡破坏机理及稳定性的认知,对软岩在湿-热-力作用下的崩解特性、强度劣化规律以及边坡稳定性分析方法进行综述。首先,讨论各类软岩的宏观崩解特性,通过电镜试验和CT扫描试验,从微观角度揭示软岩崩解机理;其次,对现有软岩无侧限抗压、三轴剪切试验成果进行总结,探讨软岩在湿、热、力条件下的强度劣化规律;最后,介绍了模型试验、数值模拟等研究手段在软岩边坡稳定性分析方面的应用,指出正确设定初始条件是模型试验以及数值模拟分析中需要着重考虑的关键因素。根据研究成果对湿-热-力作用下软岩边坡破坏机理与稳定性分析的发展方向进行了展望:应进一步细化软岩类别,根据初始状态定量分析湿、热、力等因素在软岩崩解过程中所占比重并预判其崩解特性;提高湿-热-力耦合作用下的强度测试手段,开展更符合自然状态的多因素、多变化路径下的软岩强度劣化规律研究;设计可实现湿-热-力耦合作用的边坡模型试验装置,推导能适应多种情况的新型理论分析方法,在数值模拟技术中充分考虑软岩的胀缩特性以及边坡初始孔隙裂隙分布状态。
The soft rock has low strength and is easy to deform and is easily disintegrated under the influence of factors such as wet-heat-force,etc.,which will lead to instability and failure of the slope.Many scholars have carried out researches on the disintegration mechanism of soft rock,the law of strength degradation and the stability of slopes.In order to summarize the existing research results and deepen the understanding of the failure mechanism and stability analysis of soft rock slopes,the disintegration mechanism of soft rock under the action of wet-heat-force,the law of strength degradation and the analysis methods of slope stability were reviewed.Firstly,the macroscopic disintegration characteristics of various soft rocks were discussed.Using SEM and CT scanning test,the disintegration mechanism of soft rocks was revealed from a microscopic point of view.Secondly,the results of the existing unconfined compression and triaxial shear tests of the existing soft rock were summarized,and the strength degradation law of the soft rock under the conditions of wet-heat-force was discussed.Finally,the application of research methods such as model tests,theoretical analysis and numerical simulations of soft rock slope stability was introduced.It is pointed out that setting the initial conditions correctly is a key factor that needs to be considered in model tests and numerical simulation analysis.Based on the above research results,the development direction of the failure mechanism and stability analysis of soft rock slopes under the action of wetheat-force was prospected as follows.The types of soft rock should be furtherly refined,and the proportion of factors such as wet-heat-force and other factors in the process of soft rock disintegration should be quantitatively analyzed based on the initial state,and thus predicting its disintegration characteristics.The strength testing methods under the coupling effect of moisture,heat and force should be improved,and carrying out research on the strength deterioration can of
作者
付宏渊
曹硕鹏
张华麟
曾铃
史振宁
FU Hongyuan;CAO Shuopeng;ZHANG Hualin;ZENG Ling;SHI Zhenning(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第7期2081-2098,共18页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51838001,51878070,51908069,51908073)
湖南省重点领域研发项目(2019SK2171)。
关键词
软岩边坡
湿-热-力
崩解机理
强度劣化
边坡稳定性
soft rock slope
wet-heat-force
disintegration mechanism
strength deterioration
slope stability
