Research on Generalized RQD of Rock Mass Based on 3D Slope Model Established by Digital Close-Range Photogrammetry

The traditional method of obtaining rock quality designation (RQD) cannot fully reflect the anisotropy mass and thus accurately its quality. In calculating RQD based on three-dimensional network simulation discontinuities, due to limited number samples low accuracy discontinuity data obtained by manual contact measurement, a certain deviation in is generated data, which has an impact calculation result. Taking typical slope Dongsheng quarry Changchun City as example, this study, we digital close-range photogrammetry, greatly enlarged sample size improved Based heterogeneity mass, optimum threshold spacing was determined when surveying lines were laid parallel different coordinate axes calculate generalized RQD, influence measuring blank areas caused vegetation coverage or gravel accumulation eliminated. real after eliminating obtained. Experiments showed that, areas, more truly represented complete offers new idea for evaluation engineering mass.