Abstract: In view of the second phase project of the Jinping underground laboratory(CJPL) during construction, in-situ monitoring for each of the deep underground laboratories is conducted by using the 3D laser scanner, in order to obtain point clouds and the information of tunnel contour deformation, rock mass structure, as well as the volume of the rock mass failure by post-processing. Practice has proved that the contours’ temporal change of deep rock tunnels after excavation can be measured after the post-processing of the CYCLONE software; the accuracy of measurement can satisfy engineering requirements. Characteristics of the broken surrounding rock proved that the measurement is consistent with the actual deformation; the orientation of discontinuity can also be measured accurately and efficiently by using the CYCLONE software and the algorithm based on the unit normal vector of the discontinuity; and the results are in good agreement with those obtained by traditional method; and the post-processing of CYCLONE, Geomagic Studio and 3DMAX provides a simple and efficient method to measure the volume, area and depth of the broken rock mass induced by rock burst or collapse; the result of measured depth and volume of rock burst notch is consistent with those obtained by other methods. The measurement based on the 3D laser scanning and data processing in deep rock tunnels has the advantages of simultaneously measuring full-field deformation with fast speed, safety, and high efficiency; it is therefore a quite effective method for conducting research of rock mass behavior in deep rock tunnels.

Key words: Jinping deep underground laboratories, 3D laser scanning, in-situ monitoring, full-field deformation, discontinuity orientation, rock mass failure