岩石表面粗糙度的三维定量分析方法

Study on three dimensional quantitative analysis of rock surface roughness

为探究一种三维定量描述岩石表面粗糙程度的方法,通过非接触式超景深三维显微设备获取岩石表面三维彩色等高图,提取并计算三维彩色等高图上各像素点的坐标信息,提出"表面轮廓体积均方根"Vp描述岩石表面粗糙程度。研究结果表明:Vp值与标准轮廓曲线的JRC值、节理剖面系数Rp值均存在指数函数正相关,Vp值越大,粗糙度越大;Vp用于对比粗糙度差异性更直观,克服了粗糙度各向异性及不同方向上存在随机性的理论缺陷,设备及像素点统计方法具有较好的经济性、高效性。

In order to explore a method for 3D quantitative description of rock surface roughness,the three dimensional color contour map of rock surface is obtained by using non-contact ultra depth of field three-dimensional scanning device to scan the rock surface.Three dimensional roughness parameter to describe the roughness of rock surface is established by extracting and calculating the coordinate information of each pixel in the three dimensional color image,put forward the theory of surface profile volume root-mean-square to calculate irregular volumes of rock surface.The results show that the surface profile volume root-mean-square has positive exponential correlation with standard curve of JRC value and the 2D roughness parameters respectively.The greater the Surface profile volume root-mean-square value is,the greater the roughness.The new parameter is more intuitive for comparing the roughness differences.The new description method overcomes the theoretical defects of the randomness of the roughness and the randomness in different directions,the experimental equipment and pixel count method shows its economic efficiency.