Quantification study on effective shear zone of matching 
structural plane based on illumination technology

DENG Hua-feng; FENG Yun-jie; LI Jian-lin; WANG Wen-dong; LI Guan-ye; QI Yu

doi:10.16285/j.rsm.2022.1601

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Quantification study on effective shear zone of matching structural plane based on illumination technology

更新时间：2026-06-25

- Quantification study on effective shear zone of matching structural plane based on illumination technology
- Vol. 44, Issue S1, Pages: 63-72(2023)
- 作者机构：
  
  1. 三峡大学三峡库区地质灾害教育部重点实验室,湖北,宜昌,443002
  2. 三峡大学土木与建筑学院,湖北,宜昌,443002
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.1601
  CLC： TU45
- Online First：16 November 2023，
  
  Published：2023
- 稿件说明：
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DENG Hua-feng, FENG Yun-jie, LI Jian-lin, et al. Quantification study on effective shear zone of matching structural plane based on illumination technology[J]. 2023, 44(S1): 63-72.
DOI：

DENG Hua-feng, FENG Yun-jie, LI Jian-lin, et al. Quantification study on effective shear zone of matching structural plane based on illumination technology[J]. 2023, 44(S1): 63-72. DOI： 10.16285/j.rsm.2022.1601.

摘要

结构面的有效受剪区域直接影响其抗剪性能，在以往结构面粗糙度和接触状态分析的基础上，结合结构面的形貌特征扫描和光照技术，对配称结构面有效受剪区域的量化分析方法进行了研究。结果表明：（1）在光源照射下，结构面上的光亮部分较好地反映了剪切过程中的有效受剪区域，对不同入射角下三维光亮面积百分比（BAP）的值进行了统计，随着入射角度的增大，结构面三维光亮面积百分比（BAP）整体呈近似S型的增长趋势；（2）将结构面有效受剪区域面积与结构面总面积的比值定义为有效受剪系数（JEC），结合Patton模型，从理论上分析确定了光源最佳入射角度=90°–(+i)（为结构面基本摩擦角，i为结构面平均起伏角），此时，光亮区域面积和实际有效受剪面积一致，对应BAP即为所求的结构面有效受剪系数；（3）考虑有效受剪系数，对Barton剪切力学模型进行修正，建立了修正的结构面剪切力学模型，验证分析表明该模型能较准确地估算结构面的抗剪强度。

Abstract

Effective shear zone of structural plane directly affects its shear performance. Based on the previous analysis of roughness and contact state of structural plane

the quantitative analysis method of effective shear zone of matching structural plane is studied by combining the topographic features scanning and illumination technology. The results show that: (1) Under the light source irradiation

the bright part of the structural surface reflects the effective shear zone during the shearing process. Statistical analysis of 3D bright area percentage (BAP) at different incidence angles shows that with the increase of incident angle

BAP is approximately S-shape. (2) The ratio of effective shear area to total area of structural plane is defined as structural plane effective shear coefficient JEC. By combining with the Patton model

the optimal incident angle of light source was theoretically determined as =90°–(+i ) ( represents basic friction angle of structural plane

and i represents average undulating angle of structural plane). At this point the bright area is consistent with the actual effective shear area

the corresponding BAP is effective shear coefficient JEC of the structural plane. (3) Considering the effective shear coefficient

the Barton model is modified and a modified shear mechanical model of structural plane is established. Validation analysis shows that the model can accurately estimate the shear strength of matching structural plane．

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