Stereo particle image velocimetry measurement of 3D soil deformation around laterally loaded pile in sand
来源期刊：中南大学学报(英文版)2013年第3期
论文作者：YUAN Bing-xiang(袁炳祥) CHEN Wen-wu(谌文武) JIANG Tong(姜彤) 汪亦显 CHEN Ke-ping(陈科平)
文章页码：791 - 798
Key words：particle image velocimetry; digital image correlation; stereo particle image velocimetry; laterally loaded pile; scaled model; 3D soil deformation; soil-structural interaction
Abstract: A developed stereo particle image velocimetry (stereo-PIV) system was proposed to measure three-dimensional (3D) soil deformation around a laterally loaded pile in sand. The stereo-PIV technique extended 2D measurement to 3D based on a binocular vision model, where two cameras with a well geometrical setting were utilized to image the same object simultaneously. This system utilized two open software packages and some simple programs in MATLAB, which can easily be adjusted to meet user needs at a low cost. The failure planes form an angle with the horizontal line, which are measured at 27°-29°, approximately three-fourths of the frictional angle of soil. The edge of the strain wedge formed in front of the pile is an arc, which is slightly different from the straight line reported in the literature. The active and passive influence zones are about twice and six times of the diameter of the pile, respectively. The test demonstrates the good performance and feasibility of this stereo-PIV system for more advanced geotechnical testing.
YUAN Bing-xiang(袁炳祥)1,2, CHEN Wen-wu(谌文武)1,2, JIANG Tong(姜彤)3, WANG Yi-xian(汪亦显)4, CHEN Ke-ping(陈科平)4
(1. Key Laboratory of Mechanics on Disaster and Environment in Western China (Ministry of Education), Lanzhou University, Lanzhou 730000, china;
2. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
3. North China University of Water Resources and Electric Power, Zhengzhou 450011, China;
4. School of Resources and Safety Engineering, Central South University, Changsha 410083, China)
Abstract:A developed stereo particle image velocimetry (stereo-PIV) system was proposed to measure three-dimensional (3D) soil deformation around a laterally loaded pile in sand. The stereo-PIV technique extended 2D measurement to 3D based on a binocular vision model, where two cameras with a well geometrical setting were utilized to image the same object simultaneously. This system utilized two open software packages and some simple programs in MATLAB, which can easily be adjusted to meet user needs at a low cost. The failure planes form an angle with the horizontal line, which are measured at 27°-29°, approximately three-fourths of the frictional angle of soil. The edge of the strain wedge formed in front of the pile is an arc, which is slightly different from the straight line reported in the literature. The active and passive influence zones are about twice and six times of the diameter of the pile, respectively. The test demonstrates the good performance and feasibility of this stereo-PIV system for more advanced geotechnical testing.
Key words:particle image velocimetry; digital image correlation; stereo particle image velocimetry; laterally loaded pile; scaled model; 3D soil deformation; soil-structural interaction
