The importance of discontinuity geomechanical properties is increasing as the use of numerical models with explicit or discrete rock mass structure becomes the state of practice. Joint normal stiffness and joint shear stiffness are two parameters that characterize the deformation behaviour of discontinuities. This paper presents practical guidelines to correct direct shear testing data for machine influences with regard to normal and shear joint stiffness using a method originally employed by Goodman (Methods of geological engineering in discontinuous rocks. West Publishing Company, St. Paul, 1976) to correct the normal deformation of a direct shear test. This method of correcting the normal deformation has been extended to the shear deformation to account for machine influence during the shear loading stage. The normal stiffness of 23 rough fracture specimens and 10 smooth ground specimens were measured on discontinuities in granitic specimens from NQ and NQ3 sized core using a power law (Swan in Rock Mech Rock Eng 16:19–38, 1983), a hyperbolic law (Bandis et al. in Int J Rock Mech Min Sci Geomech Abstr 20:249–268, 1983), and two semi-logarithmic laws (Bandis et al. 1983; Evans et al. in Geotherm Resour Counc Davis Calif USA 16:449–456, 1992). Measurements from direct shear tests completed at varying maximum applied normal stress show a positive correlation between normal stiffness and normal stress. In addition, the shear stiffness was measured on 19 rough fracture specimens and 4 smooth ground specimens. The compilation of results from these measurements has a range of measured shear stiffness due to varying joint topology and roughness showed a positive correlation between shear stiffness and maximum applied normal stress. As the majority of the joints exhibited non-linear behaviour under normal loading conditions and linear behaviour under shear loading conditions, it is recommended that a stress-dependent normal stiffness model and a linear shear stiffness model be used for numerical modelling purposes.

随着使用具有显式或离散岩体结构的数值模型成为实践状态，不连续性地质力学特性的重要性正在增加。接头法向刚度和接头剪切刚度是表征不连续变形行为的两个参数。本文介绍了使用古德曼最初采用的方法（不连续岩石中的地质工程方法。West Publishing Company，St. Paul，1976）校正机器对法向和剪切接头刚度影响的直接剪切测试数据的实用指南。直剪试验的法向变形。这种修正法向变形的方法已扩展到剪切变形，以解决剪切加载阶段机器的影响。使用幂律 (Swan in Rock Mech Rock Eng 16:19–38, 1983)、双曲线定律 (Swan in Rock Mech Rock Eng 16:19–38, 1983) 在 NQ 和 NQ3 尺寸岩心的花岗岩试样的不连续性上测量了 23 个粗糙断裂试样和 10 个光滑地面试样的法向刚度Bandis 等人在 Int J Rock Mech Min Sci Geomech Abstr 20:249–268, 1983）和两个半对数定律（Bandis 等人，1983 年；Evans 等人在 Geotherm Resour Counc Davis Calif USA 16:449– 456, 1992)。在不同的最大施加法向应力下完成的直接剪切试验的测量结果显示法向刚度和法向应力之间呈正相关。此外，还测量了 19 个粗糙断裂试样和 4 个光滑地面试样的剪切刚度。由于不同的接头拓扑结构和粗糙度，这些测量结果的汇编具有一系列测量的剪切刚度，显示剪切刚度与最大施加的法向应力之间呈正相关。由于大多数接头在正常载荷条件下表现出非线性行为，在剪切载荷条件下表现出线性行为，因此建议将应力相关法向刚度模型和线性剪切刚度模型用于数值建模目的。