基于剪切行为结构面形貌特征的描述

发布时间：2018-08-07 07:27

【摘要】：描述岩石结构面形貌特征的一个重要作用就是为了能更好地理解结构面的剪切行为。首先,从结构面剪切具有方向性的特点出发,抓住在剪切方向上对剪切行为起关键作用的结构面形貌特征,提出描述结构面形貌特征的参数抗剪系数SC。该参数描述了在剪切方向上二维形貌的起伏特征、起伏的统计分布特征以及高度特征,并且还可以表征结构面形貌的方向性。同时,在对10条节理粗糙度系数JRC标准曲线的数字化基础上,建立了抗剪系数SC与JRC值之间的拟合关系。基于三维白光扫描技术得到的自然岩石结构面的点云数据,进一步将抗剪系数SC进行了三维化扩展,使其能够较好地描述结构面的三维形貌特征。最后,以某自然岩石结构面为算例,用三维抗剪系数SC3D度量其沿不同分析方向上的形貌特征,结果表明,抗剪系数能很好地表征结构面形貌特征的各向异性。
[Abstract]:One of the important functions of describing the morphologic characteristics of rock structural plane is to better understand the shear behavior of the structural plane. Firstly, based on the directional characteristics of structural plane shear, the shape characteristics of structural plane which play a key role in shear behavior in the shear direction are grasped, and the parameter shear coefficient SCS is proposed to describe the structural surface morphology characteristics. This parameter describes the fluctuation characteristics, statistical distribution characteristics and height characteristics of the two-dimensional topography in the shear direction, and can also characterize the directionality of the morphology of the structural plane. At the same time, the fitting relationship between shear coefficient SC and JRC value is established on the basis of digitalization of 10 JRC standard curves of joint roughness coefficient. Based on the point cloud data of natural rock structure surface obtained by 3D white light scanning technique, the shear coefficient SC is further expanded to describe the 3D morphology of the structural plane. Finally, taking a natural rock structure plane as an example, the 3-D shear coefficient SC3D is used to measure the morphology characteristics along different analytical directions. The results show that the shear coefficient can well characterize the anisotropy of the structural plane morphology characteristics.
【作者单位】：东北大学深部金属矿山安全开采教育部重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;宁波市高等级公路建设指挥部;
【基金】：国家重点研发计划(No.2016YFC0600707) 国家自然科学基金资助(No.51579043) 中央高校基本科研业务费项目(No.120701001) supported by the Key Research Development Program of China(2016YFC0600707) the National Natural Science Foundation of China(51579043) the Fundamental Research Funds for the Central Universities(120701001)
【分类号】：TU45

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