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Digital close-range photogrammetric application to small-scale physical simulation experiment

中国有色金属学会会刊：英文版 2011年第S3期21卷 681-685页

作者： LI Chun-yi1, CUI Xi-min2, YU Yi-ju3 1. School of Surveying and Landing Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China 2. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China 3. Surveying and Mapping Press, Beijing 100045, China School of Surveying and Landing Information Engineering Henan Polytechnic University Jiaozuo 454003 China College of Geoscience and Surveying Engineering China University of Mining and Technology Beijing 100083 China Surveying and Mapping Press Beijing 100045 China

In order to research the possibility of digital close-range photogrammetric surveying in small scale physical simulation experiment, physical model coinciding with engineering practice was constructed based on similar theory. The datum processing method and surveying precision of digital close-range photogrammetric were analyzed. And the function relationship between overburden subsidence factor qr and the ratio z/H of stratum horizon z and mining depth H was researched. The results show that surveying points position mean error along horizontal direction is ±0.131 mm and vertical direction is ±0.192 mm. Therefore, multi-taking station cross direction digital close-range photogrammetric can completely satisfy the precision need of physical simulation experiment. And the empirical formula can be utilized to represent evolution law of stratum subsidence factor.

关键词： close-range photogrammetric physical simulation light-rays adjustment surveying precision subsidence factor

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Measurement on soil deformation caused by expanded-base pile in transparent soil using particle image velocimetry (PIV)

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Journal of Mountain Science 2017年第8期14卷 1655-1665页

作者： QI Chang-guang ZHENG Jin-hui ZUO Dian-jun CHEN Geng Faculty of Architectural Civil Engineering and EnvironmentNingbo University Tianjin Research Institute for Water Transport Engineering M.O.T. Geotechnical Research Institute Hohai University

A new small-scale geotechnical physical model in 1-g and unconfined condition, combining the transparent soil, close-range photogrammetry and particle image velocimetry(PIV), was employed, which provides a non-intrusively internal deformation measurement approach to monitor the internal deformation of soil caused by expanded-base pile jacking with casing. The transparent soil was made of fused quartz and its refractive index matched blended oil, adding reflective particles(glass beads). closerange photogrammetry was employed to record the images of the process of casing jacking and extraction in transparent soil, allowing the use of Matlab-based Geo-PIV to figure out the displacement field converted from image space to object space. Analysis of test results indicates that the maximum displacement caused by casing jacking for expandedconical-base pile is decreased by 29% compared with that for expanded-flat-base pile. The main movement happens at the early stage of casing extraction. The maximum displacement caused by casing extraction for the conical base is about 43% of that for the flatbase, while the affected zone caused by casing extraction for the conical base accounts for about 1/3 of that for the flat base. The contraction for horizontal displacements tends to decrease with the depth increasing. By contrast, the contraction under pile base decreases with the increasing of displacement. The displacements generated by jacking a conventional pile having a diameter equal to the casing diameter of the expanded-base pile were comparable to the net displacement taking place due to expanded-base pile installation for the conical base pile.

关键词： Geotechnical physical model Expanded-base pile Transparent soil Particle image velocimetry(PIV) close-range photogrammetry

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维普期刊数据库

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Photo geologic logging methods

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中国有色金属学会会刊：英文版 2005年第S1期15卷 250-253页

作者： ZHANG You-jing, LI Hao, GAO Yun-xiao (Department of Surveying and Mapping, Hohai University, Nanjing 210098, China)

Aiming at the shortage of hydroelectric engineering geological logging methods on high side slope and big gallery, the photographic methods based on digital camera were studied. By integrating the application of technology of close range photogrammetry, digital image processing and GIS, the photographic geological logging information system was developed. The system has the functions of digital photography, orthophotoquad making, image mosaicking, logging factors extracting and measuring, CAD mapping, etc. The methods achieve more efficient and higher precision than the regular, and it provides a new way for the hydroelectric engineering geologic logging.

关键词： photo geologic logging digital camera close-range photogrammetry GIS

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