摘要
为定量刻画岩石结构面内部隙宽的变化特征,以劈裂结构面为研究对象,采用便携式近景摄影测量技术,构建其内部空间三维点云模型;结合分形理论,分析不同方向采样轮廓线与区域的各向异性,并采用立方体覆盖法,研究三维隙宽曲面的尺寸效应。结果表明:便携式近景摄影测量方法误差接近影像比例尺法;不同采样方向的平均隙宽、分形维数及隙宽曲面分形维数均呈现明显各向异性;随着观测尺寸增大,分形维数先波动增大,后波动减小,最终趋于稳定。便携式近景摄影测量技术可有效定量描述结构面内部隙宽变化,且劈裂结构面隙宽具有各向异性和尺寸效应。
In order to quantitatively describe the variation characteristics of discontinuity aperture,a splitting discontinuity is taken as the research object,and a 3D point cloud model of the internal space of the discontinuity is constructed using portable close-range photogrammetry.The anisotropy of different sampling contour lines and areas is analyzed using fractal theory.The size effect of the 3D aperture surface is studied using the cube covering method.The results show that:(a)the measurement error of this method is close to that of the image scale method;(b)the average aperture,fractal dimension of different directions,and fractal dimension of the aperture surface all show significant anisotropy;and(c)as the observation size increases,the fractal dimension first increases with fluctuations,then decreases with minor fluctuations,and finally stabilizes.The study shows that the portable close-range photogrammetry can effectively and quantitatively describe the internal aperture variation of the discontinuity,and the splitting discontinuity aperture has anisotropy and size effect.
作者
徐千博
周鑫
彭是焱
金柯
XU Qianbo;ZHOU Xin;PENG Shiyan;JIN Ke(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Northeast Integrated Survey and Design Research Institute,Xi'an 710031,Shaanxi,China)
出处
《水力发电》
2025年第10期14-21,111,共9页
Water Power
基金
重庆市自然科学基金面上项目(cstc2021jcyj-msxm-X0869)
重庆市教委科学技术研究项目(KJQN202200709)
重庆市研究生联合培养基地建设项目(JDLHPYJD2022004)。
关键词
结构面
隙宽
近景摄影测量技术
分形特征
各向异性
尺寸效应
discontinuity
aperture
portable close-range photogrammetry
fractal characteristics
anisotropy
size effect
