The mechanical behaviour of natural, unfilled rock joints is influenced by the interaction between surface roughness and matedness of the contact surfaces. In the field, natural rock joints normally exhibit a mismatch between the contact surfaces, mainly due to different geological processes such as weathering or deformations. Various attempts have been made to estimate how matedness of rock joints influences their peak shear strength. However, the proposed methodologies imply certain difficulties since they are intended to estimate the matedness of rock joints based mainly on visual inspection, and by relating an initial shear displacement to the length of the analysed sample or by relating the opening of saw-tooth and two-dimensional joint profiles with the degree of interlocking. Therefore, a tested peak shear strength criterion for natural, unfilled rock joints that realistically accounts for the influence of matedness on their peak shear strength is still lacking. This paper presents a methodology where objective measurements of the average aperture of natural, unfilled rock joints are used to estimate their matedness as a step in the prediction of the peak shear strength. This measured average aperture is based on high-resolution optical scanning of the surface roughness. The proposed relationship between measured average aperture and matedness of natural rock joints has been included in a further developed peak shear strength criterion. The verification against ten natural rock joint samples of coarse-grained granite showed that the revised criterion can predict the peak shear strength considering rock joint matedness.

中文翻译：

---

基于测量孔径预测天然、未填充岩石节理的峰值剪切强度考虑匹配

天然未填充岩石节理的力学行为受表面粗糙度和接触面匹配度之间的相互作用的影响。在现场，天然岩石节理通常表现出接触面之间的不匹配，这主要是由于不同的地质过程，如风化或变形。已经进行了各种尝试来估计岩石节理的配合如何影响其峰值剪切强度。然而，所提出的方法意味着一定的困难，因为它们主要基于目视检查来估计岩石节理的匹配度，并将初始剪切位移与分析样本的长度相关联，或者通过将锯齿的开口和两个具有互锁程度的维接缝型材。因此，经过测试的自然峰值剪切强度标准，仍然缺乏未填充的岩石节理，它实际上解释了配对对其峰值剪切强度的影响。本文提出了一种方法，其中使用天然未填充岩石节理的平均孔径的客观测量来估计它们的匹配性，作为预测峰值剪切强度的一个步骤。该测量的平均孔径基于表面粗糙度的高分辨率光学扫描。测得的平均孔径与天然岩石节理的配合度之间的拟议关系已包含在进一步发展的峰值剪切强度标准中。对10个粗粒花岗岩天然岩石节理样本的验证表明，修正后的准则可以预测考虑岩石节理匹配度的峰值剪切强度。