岩石自然结构面刻录制作方法及其直剪条件下磨损特征分析

doi:10.13722/j.cnki.jrme.2018.0668

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摘要岩体结构面剪切强度特性及其剪切过程中的磨损机制研究是工程岩体稳定性分析的关键和基础，首先提出“三维光学扫描技术+数控刻录技术”的结构面批量制作方法并刻录了含自然结构面形貌的砂岩、大理岩、花岗岩剪切试样，进而开展不同法向应力下上述3种岩石自然结构面的直剪试验及其同步声发射监测，最后利用点云配准算法实现了剪切前后结构面3D扫描点云数据重合，并深入分析剪切条件下岩石自然结构面磨损特征。试验分析表明，所提出的岩石自然结构面刻录方法保真率高、试验结果一致性好；依据同步声发射信号特征可将剪切过程大体分为3个阶段：I摩擦滑动阶段、II剪切啃断阶段、III峰后磨损下降阶段；进一步对比分析结构面剪切前后的2D和3D的细观形貌基础上揭示结构面剪切磨损在细观上具有正斜面滑动、陡坎非均匀磨损、凸点局部啃断特征，宏观上具有剪切破坏区域分布的局部化和非均匀性特征，这对于含自然结构面的工程岩体抗剪稳定性分析具有重要参考意义。

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	江权1
	杨冰1
	2
	刘畅1
	2
	冯夏庭1
	史应恩1
	2
	宋磊博3
	王秋霖1

关键词 ：岩石力学, 岩石自然结构面, 数控刻录, 剪切磨损, 直剪试验

Abstract：The shear strength characteristics and the wearing mechanism of rock joints in the shear process are very important for analyzing the stability of rock mass. 3D laser scanning and numerical controlled engraving were used to produce the natural joints in the specimens of sandstone，marble and granite. The point cloud registration and the fidelity rate test were carried out based on the standard ICP algorithm of four elements. The direct shear tests with acoustic emission monitoring to three kinds of natural rock joints under different normal stresses were carried out. The overlapping of the point cloud data of rock joints before and after shear test was realized with the algorithm of point cloud registration. The wearing characteristics of natural joints were analyzed. The experimental results show that the natural rock joints produced by engraving are of high accuracy and lead to consistent results. Based on the AE characteristics，the shear process can be divided into three stages：I-frictional sliding stage，II-shearing and gnawing stage，and III-residual friction stage. Comparison of the 2D and 3D morphology before and after the shear tests show that the front slope slides，the inhomogeneous wearing damage and local gnawing of the convex point occur on meso-scale，and the local and inhomogeneous failure zones occur on macro-scale.

Key words： rock mechanics natural rock joints numerical servo engraving shear damage direct shear test

引用本文:

江权1，杨冰1，2，刘畅1，2，冯夏庭1，史应恩1，2，宋磊博3，王秋霖1. 岩石自然结构面刻录制作方法及其直剪条件下磨损特征分析[J]. 岩石力学与工程学报, 2018, 37(11): 2478-2488.
JIANG Quan1，YANG Bing1，2，LIU Chang1，2，FENG Xiating1，SHI Ying?en1，2，SONG Leibo3，WANG Qiulin1. Manufacturing of natural rock joints by engraving and analysis of wearing damage of natural rock joints under shear tests#br#. , 2018, 37(11): 2478-2488.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0668 或 http://www.rockmech.org/CN/Y2018/V37/I11/2478

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