岩石非对称凸起结构面抗剪特性试验研究
Experimental study on shear behavior of rock asymmetric convex discontinuity
郑菲 1魏传文 2王相龙 2杨旭旭 1赵玉棣 2邵行 3满新杰 2张长安 3周洋洋 2薛洪运1
作者信息
- 1. 山东科技大学 土木工程与建筑学院,山东 青岛 266590
- 2. 山东高速基础设施建设有限公司,山东 济南 250101
- 3. 山东省交通规划设计院集团有限公司,山东 济南 250101
- 折叠
摘要
基于楔齿形结构面形貌特征,制作3种不同形貌的结构面,研究了楔齿结构特征参数最大潜在接触面积比A0 在不同法向应力作用下对结构面剪切特性的影响规律.试验结果表明,结构面法向应力较小、A0 较大情况下的破坏模式主要是爬坡磨损,其剪切应力-位移曲线呈现滑移型;随着法向应力增大、A0 减小,破坏模式逐渐转变为爬坡切齿和完全剪断破坏,其剪切应力-位移曲线呈现峰值剪断Ⅰ型和峰值剪断Ⅱ型.法向应力增大限制了持续剪胀效应,而A0 的减小改变了迎坡面的受力,使凸起在发生剪断时的有效承载面积增大,从而影响结构面抗剪强度.基于试验结果提出了新的结构面抗剪强度模型,为岩石非对称凸起结构面抗剪强度计算提供了参考依据.
Abstract
Based on the topographic characteristics of wedge-shaped discontinuity,three distinct types of topographic discontinuity are fabricated to investigate the influence of maximum potential contact area ratio A0 on the shear behavior of these structures under varying normal stresses.The experimental results show that the failure mode of the discontinuity under the condition of low normal stress or large A0 is mainly climbing wear,and the shear stress-displacement curve shows a slip type.With the increase of normal stress or the decrease of A0,the failure mode gradually changes to climbing gear cutting and complete shear failure,and the shear stress-displacement curve presents peak shear type Ⅰ and peak shear type Ⅱ.The increase of normal stress limits the sustained dilatation effect,while the decrease of A0 changes the force on the facing slope and increases the effective bearing area of the convex during shearing,thus affecting the shear strength of the discontinuity.Based on the experimental results,a new discontinuity shear strength model is proposed,which can provide a reference for the calculation of the shear strength of rock asymmetrical convex discontinuity.
关键词
岩石/非对称凸起/最大潜在接触面积比/结构面/破坏模式/抗剪特性Key words
rock/asymmetrical convex/maximum potential contact area ratio/discontinuity/failure mode/shear behavior引用本文复制引用
出版年
2024
NETL
NSTL
万方数据