软硬岩互层反倾高边坡变形破坏过程物理模型试验研究
EXPERIMENTAL STUDY ON PHYSICAL MODEL OF DEFORMATION EVOLUTION MODE OF HIGH SLOPE WITH REVERSE DIP OF SOFT AND HARD ROCK
龚柏城 1苑久超 2王磊 1吉锋1
作者信息
- 1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都 610059
- 2. 中国电建集团华东勘察设计研究院有限公司,杭州 311122
- 折叠
摘要
反倾高边坡是工程界一类易致灾性地质体,为揭示软硬岩组合条件下斜坡倾倒变形内在机理,本研究通过配制相似材料,采用底摩擦实验分析软硬岩不同组合条件下的边坡破坏模式,并使用PIVlab工具箱进行分析.结果表明:软硬岩边坡在变形破坏模式上有较大的差异性,软岩边坡多以变形为主,层间多发生倾倒弯曲,垂直层面的裂隙产生较少,不易形成贯通破裂面;硬岩边坡多以倾覆折断破坏为主,岩层内部拉张裂隙发育并连通,最后产生阶坎状贯通破坏面;软硬互层边坡在倾倒弯曲之后,发生倾覆破坏,直至形成贯通破裂面.在含有硬岩层的反倾边坡中,更易出现"悬臂梁"式结构,这表明硬岩层更易发生折断破坏,所以硬岩层比例较多的反倾边坡,更易发生整体破坏.PIVlab 计算结果与试验现象过程吻合性好,计算能正确反映边坡的位移矢量特点,并划分出变形特征范围.
Abstract
Reversed high slopes are a type of geohazard commonly encountered in engineering practice.In order to unveil the intrinsic mechanisms governing the instability and deformation of slopes composed of both soft and hard rock combinations,this research adopts a method of preparing analogous materials and employs bottom friction experiments to analyze the failure patterns of slopes under different combinations of soft and hard rocks.Additionally,the PIVlab module is utilized for further analysis in this study.The results indicate significant differences in deformation and failure modes among slopes with different lithological properties.Slopes composed of soft rock mainly undergo deformation,with interlayer tilting and bending occurring frequently.Few vertical fractures are generated,and the formation of continuous rupture surfaces is less likely.On the other hand,slopes consisting of hard rock tend to experience overturning and fracturing as the dominant failure mode.Transverse joint development and connectivity within the rock mass result in the formation of stepped continuous failure surfaces.In cases of slopes with alternating layers of soft and hard rock,after tilting and bending,fractures occur until continuous rupture surfaces are formed.In slopes containing hard rock layers,a"cantilever beam"type of structure is more likely to occur,indicating a higher propensity for fracturing failure in hard rock layers.In slopes where hard rock layers comprise a significant proportion,overall failure is more likely to take place.The results obtained from PIVlab calculations demonstrate a good agreement with observed phenomena during the experimental process.The calculated displacements accurately reflect the vector characteristics of the slopes and delineate the range of deformation features.
关键词
软硬互层/破坏机制/底摩擦实验/PIVlabKey words
soft and hard interlayer/destruction mechanism/bottom friction test/PIVlab引用本文复制引用
出版年
2024
NETL
NSTL
万方数据