经历剪切变形历史的岩石节理表面形貌变化研究.docVIP

收稿日期： 修订日期： 基金项目：国家自然科学基金资助项目；中南大学研究生学位论文创新资助项目（2011ssxt271）；中南大学米塔尔学生创新项目（11MX22） 通讯作者：曹平（1959-），男，博士，教授，博士生导师。主要从事岩石断裂力学与工程应用方面的教学和研究工作。Email:pcao_csu@ 经历剪切变形历史的岩石节理表面形貌变化研究 曹 平，梅慧浩，宁果果, 范 祥，刘新颖 （中南大学 资源与安全工程学院，湖南 长沙 410083） 摘要：本文采用巴西劈裂法制成四组不同岩性的人工节理面，利用RYL–600岩石剪切流变仪对节理进行不同垂直压应力下的剪切试验，并运用TALYSURF CLI 2000扫描仪在每次剪切前后对节理面进行扫描，计算了多个描述节理面形貌特征的三维参数值，通过三维参数值的变化定量分析了节理面细观形貌的变化。研究结果表明：节理面抗剪强度的变化与节理面形貌变化有紧密联系，经历四次剪切作用后，（1）节理面整体高度略微降低，各点间的高差缩小；（2）峰点密度减小，节理面的凹凸程度降低；（3）节理表面形态的各向异性程度降低，节理面整体的倾斜程度降低；（4）对于节理面的同一变化，不同参数反映的角度和变化的幅度都不同,随垂直应力的增加，各次剪切作用后节理面的形貌变化量逐渐减小，形貌趋于平整。 关键词：岩石节理；剪切试验；三维形貌参数；细观形貌；变化 中图分类号：TU45 文献标识码：A 文章编号： Evolution Analysis of Surface Topography of Rock Joints Under Different Shear Deformation Histories CAO Ping, MEI Hui-hao, NING Guo-guo，FAN Xiang，LIU Xin-ying (School of Resources and Safety Engineering, Central South University, Changsha 410083, China) Abstract: Four diverse characters of artificial rock joints were made by Brazilian tests, shear tests of rock joints under different normal stresses were conducted with RYL–600 rock shear-rheological instrument, moreover, the surface of each joint was scanned prior to and after each shear test with the scanner instrument TALYSURF CLI 2000. A series of 3D parameters were obtained, the meso-level topography evolution of rock joint surfaces are quantitatively analyzed through the value alterations of the 3D parameters. The results indicate that the alteration of shear strength has obvious relations with the alteration of joint surface topography, (1) the whole height of joints lowered slightly after four shear tests, and the altitude differences of points lowered; (2) the density of peaks decreased, the unevenness of joint surfaces decreased; (3) the anisotropy degree of joint surfaces decreased, and the incline of joint surfaces decreased；(4) with regard to the same alteration of joint, the angle and extent that different parameters reflect were different. The topog