Three-dimensional geological modeling of Longyou grotto No.3 with terrestrial laser scanning
作者单位：Key Laboratory of Shale Gas and GeoengineeringInstitute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2015年度（第15届）学术年会》
会议日期：2016年
学科分类：081801[工学-矿产普查与勘探] 081603[工学-地图制图学与地理信息工程] 081802[工学-地球探测与信息技术] 07[理学] 08[工学] 070503[理学-地图学与地理信息系统] 0818[工学-地质资源与地质工程] 0705[理学-地理学] 0816[工学-测绘科学与技术]
基 金：financially supported by National Natural Science Foundation of China(41272353) China Postdoctoral Science Foundation(No.2014M550838)
摘 要：Terrestrial laser scanning is a Three-Dimensional(3D)measuring technology that rapidly developed in recent *** this measuring technology users can generate a 3D point cloud,derive the size and geometry of objects rapidly and accurately and build a high resolution 3D surface *** technology is/widely used in many fields,such as geotechnical engineering,surveying and mapping and preservation of cultural *** Longyou grottoes,a group of ancient underground caverns,are a famous sightseeing place in *** a realistic geological model for stability assessment is important in order to develop and protect Longyou grottoes in terms of preserving the cultural relics and safety of the visiting *** cloud data for Longyou grottoes No.1 to 5 have been acquired by a Leica ScanStation 2 and each of the point cloud datasets were joined together with the help of targets organized before *** point cloud data was transformed to another coordinate system to be merged with contour line data of the local *** to a geological survey and the point cloud data,several points in the same bedding planes were extracted in the entrance of cavern No.3,which were used to reconstruct the bedding planes by least square regression method.A detailed model of cavern No.3 was built and a numerical analysis to calculate the tensile stress in the roof was carried *** a comparison was made about whether or not taking the bedding planes into the models of the tensile stress in the *** numerical results show that weak mudstone interlayers have a significant influence on the stress state in the roof of cavern *** decreasing strength of the interlayers,the trend of tensile stress areas enlarging is consistent with the expansion cracks.