双像解译的结构面迹线产状测量方法

Measurement Method of Discontinuity Trace Occurrence Based on Double Image Interpretation

结构面产状是重要的地质信息,岩体结构面出露类型有线状构造和面状构造两种。针对地质罗盘和点云解析无法有效测量呈线状构造出露的结构面产状的问题,以国内某地下金属矿巷道开挖面为研究对象,提出了一种双像解译的结构面迹线产状测量方法。首先,从两个不同角度各拍摄一张待测岩体图像;然后,通过搜寻最小代价路径的方式识别其中一幅图像中的结构面迹线,并沿每条结构面迹线布设多个锚点;随后,双像经同名点匹配后使用共线方程求解所有锚点三维坐标;最后,使用最小二乘平面拟合确定结构面迹线所在平面方程,根据平面法向量计算结构面产状。所得结构面产状测量结果与Sirovision系统测量结果较为接近,验证了所提方法的可靠性与实用性。研究成果可为开展更加详实和可靠的结构面调查提供有益参考。

The discontinuity occurrence is an important geological information.There are usually two types of rock mass discontinuity exposure,including linear structure and planar structure.Aiming at the problem that the geological compass and point cloud analysis can not effectively measure the occurrence of discontinuities exposed as linear structure,the excavation face of an underground metal mine roadway was taken as the research object,and a measurement method of discontinuity trace occurrence based on double image interpretation was proposed.Firstly,two images of rock mass to be measured were taken from two different perspectives.Secondly,the discontinuity traces in one of the images were identified by searching the minimum cost path,and several anchor points were arranged along each discontinuity trace.Then,collinear equation was used to solve the 3D coordinates of all anchor points after matching the corresponding image points.Finally,the least square plane fitting method was used to determine the equation of discontinuity plane and the discontinuity occurrence was calculated according to the plane normal vector.The reliability and practicability of the proposed method was verified by comparing the measurement results of the proposed method and the Sirovision system.The research results can provide a reference for more detailed and reliable discontinuity investigation.