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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第7期    总第251期    2015年7月

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文章编号:1672-7207(2015)07-2524-08
节理三维形貌参数的采样效应与峰值抗剪强度准则
唐志成1, 2,刘泉声1,夏才初2

(1. 武汉大学 土木建筑工程学院,湖北 武汉,430072;
2. 同济大学 地下建筑与工程系,上海,200092
)

摘 要: 采用TJXW-3D型便携式岩石三维表面形貌仪对3组不同形貌的节理试件进行形貌测试,采用不同的采样间距获得形貌坐标的三维离散点数据。采用节理形貌描述方法计算节理的三维粗糙度,其值随采样间距的增大而逐步减少、最终趋于稳定,与采样间距呈对数函数的关系。根据3组节理在5级法向应力下的直剪试验结果,提出考虑采样间距影响的节理峰值抗剪强度公式,采样效应系数与采样间距呈幂函数关系。采用岩石节理的直剪试验结果对所提公式进行验证,计算值与试验值较吻合。

 

关键词: 岩石节理;峰值抗剪强度;三维形貌参数;采样效应

Investigation of three-dimensional roughness scale-dependency and peak shear strength criterion
TANG Zhicheng1, 2, LIU Quansheng1, XIA Caichu2

1. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China;
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

Abstract:In order to obtain three-dimensional discrete points, three rock joint replicas were measured and digitized with TJXW-3D-typed portable rock surface topography by different sampling intervals. Three-dimensional roughness metric method was analyzed. The roughness decreases with the increasing sample interval, but stabilizes eventually. An empirical relationship between the sample interval and roughness was established and there was a logarithmic function. According to direct shear test of three joints over 5-level normal stresses, a peak shear strength criterion taking into account the sampling effect was proposed for rock joints. There was a power function between the sampling interval and the sampling coefficient. The published experimental datum was used to validate the proposed criterion. The results show that there is a good agreement between the calculated values and the experimental results. Thus, the peak shear strength of rock joints can be predicted by the proposed criterion.

 

Key words: rock joint; peak shear strength; three-dimensional morphology parameters; sampling effect

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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