Estimating the relation between surface roughness and mechanical properties of rock joints
Estimating the relation between surface roughness and mechanical properties of rock joints
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DOI：
10.1016/j.ijrmms.2005.11.013
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发表时间：
2006-09-01
影响因子：
7.2
通讯作者：
Tanabashi, Yosihiko
中科院分区：
文献类型：
--
作者：
Jiang, Yujing;Li, Bo;Tanabashi, Yosihiko
岩体中的不连续面对块状岩体系统的变形行为有重要影响。对于单个岩石节理而言，其表面粗糙度对其机械和水力特性（如摩擦角、抗剪强度和剪胀/孔径）至关重要。岩石节理表面粗糙度的表征方法有很多，如节理粗糙度系数（JRC）、均方根（RMS）等。结构功能（SF）等。然而，这些方法大多只能用于二维模型。在本研究中，我们对岩石节理在恒法向载荷（CNL）和恒法向刚度（CNS）条件下进行了直接剪切实验，并使用三维激光扫描轮廓仪系统测量了剪切前后岩石节理的表面。采用三维分形评价方法对粗糙度进行表征。投影覆盖法（PCM）和高精度直剪仪。研究了不同边界条件下岩石节理的力学特性与其二维和三维模型分形维数变化的关系，为准确评价岩石节理表面粗糙度的演变及其对岩石节理水力学行为的影响提供了新的途径。(c) 2006 Elsevier Ltd.版权所有。
Discontinuities in rock masses have an important influence on deformational behaviour of blocky rock systems. For a single rock joint, the roughness of its surface is of paramount importance to its mechanical and hydraulic properties, such as friction angle, shear strength, and dilatancy/aperture. Many methods have been used to characterize the surface roughness of rock joints, such as joint roughness coefficients (JRC), root mean square (RMS) value. Structure function (SF) etc. However, most of these methods can only be used in the 2-D models. In this study, we carried Out direct shear experiments on rock joints under both constant normal load (CNL) and constant normal stiffness (CNS) conditions, and measured the surfaces of rock joints before and after shearing, using a 3-D laser scanning profilometer system. By using a 3-D fractal evaluation method of roughness characterization. the projective covering method (PCM) and a direct shear apparatus of high accuracy. the relation between mechanical properties of rock joints under different boundary conditions and the change of their fractal dimensions in both 2-D and 3-D models have been examined, which gives a new approach to accurately evaluate the evolution of roughness of rock joint surfaces and its influence on the hydro-mechanical behaviours of rock joints. (c) 2006 Elsevier Ltd. All rights reserved.