Measurement of local and volumetric deformation in geotechnical triaxial testing using 3D-digital image correlation and a subpixel edge detection algorithm     

Wang  Pengpeng  Guo  Xiaoxia  Sang  Yong  Shao  Longtan  Yin  Zenan  Wang  Yudi 《Acta Geotechnica》2020,15(10):2891-2904

Based on the three-dimensional digital image correlation (3D-DIC) technique, the stereovision system has been applied to the improved triaxial apparatus to obtain 3D full-field deformation of the specimen during triaxial testing. Through the calibration process, the 3D-DIC technique can obtain the accurate specimen’s spatial displacement deformation. Meanwhile, a subpixel edge detection algorithm has been combined with 3D-DIC technique to calculate the radial strain and the volume strain of the specimen directly. Furthermore, a series of consolidated drained and undrained triaxial tests were carried out on Hainan (China) sand specimens and measured by the conventional and the image measurement methods. Compared to the results measured by the conventional method, the image measurement technique can obtain the more experimental data, such as the 3D displacement field of the whole specimen, the local strain distribution, and so on. The measurement results also show the conventional method would be disturbed by the end constraints in triaxial tests so that the strength of the soil would be overestimated. Meanwhile, the middle of the specimen would be selected to calculate the stress–strain relationship without the influence of the end constraints in the proposed method. Based on the image measurement results, the proposed method has the potential to be used in geotechnical tests for exploring the soil’s progressive failure behaviors, inhomogeneous deformation and mechanical characteristics.

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Measurement of the deformation of sand in a plane strain compression experiment using incremental digital image correlation     

Wang  Pengpeng  Sang  Yong  Shao  Longtan  Guo  Xiaoxia 《Acta Geotechnica》2019,14(2):547-557

Acta Geotechnica - This work presents the results from a series of plane strain compression experiments on medium-density sands. In these experiments, a new type of plane strain experimental...  相似文献   

Experimental investigations of the soil water retention curve under multiple drying–wetting cycles     

Wen  Tiande  Shao  Longtan  Guo  Xiaoxia  Zhao  Yanru 《Acta Geotechnica》2020,15(11):3321-3326

Acta Geotechnica - Natural soils usually experience multiple drying and wetting cycles in geotechnical engineering. In this paper, the influences of history of drying and wetting upon the...  相似文献   

Similarity criterion for the nonlinear thermal analysis of the soil freezing process: considering the dual effect of nonlinear thermal parameters and boundary conditions     

Chen  Zhixiang  Feng  Yanfang  Zhang  Xuncheng  Guo  Xiaoxia  Shao  Longtan  Cao  Yapeng  Li  Shunqun  Gao  Lingxia 《Acta Geotechnica》2022,17(12):5709-5719

Acta Geotechnica - Model tests are an important method to predict the design and long-term performance of structures and are widely used to analyze the seismic performance, wind resistance, etc.,...  相似文献   

An assessment of global ocean wave energy resources over the last 45 a   总被引：7，自引：6，他引：1  

ZHENG Chongwei  SHAO Longtan  SHI Wenli  SU Qin  LIN Gang  LI Xunqiang  CHEN Xiaobin 《海洋学报(英文版)》2014,33(1):92-101

Against the background of the current world facing an energy crisis,and human beings puzzled by the problems of environment and resources,developing clean energy sources becomes the inevitable choice to deal with a climate change and an energy shortage.A global ocean wave energy resource was reanalyzed by using ERA-40 wave reanalysis data 1957–2002 from European Centre for Medium-Range Weather Forecasts(ECMWF).An effective significant wave height is defined in the development of wave energy resources(short as effective SWH),and the total potential of wave energy is exploratively calculated.Synthetically considering a wave energy density,a wave energy level probability,the frequency of the effective SWH,the stability and long-term trend of wave energy density,a swell index and a wave energy storage,global ocean wave energy resources were reanalyzed and regionalized,providing reference to the development of wave energy resources such as wave power plant location,seawater desalination,heating,pumping.  相似文献