摘要
以数字图像相关技术为基础,在不接触被测物体表面的情况下,采用无标识点法捕捉室内静压桩模型试验中土体的位移信息,分析并获得土体的位移规律。通过自行编制的MATLAB计算程序,可以计算提取出压桩过程中土体所有位置在任意时刻的位移变化,从而对不同桩型、不同排土体积产生的土体位移进行了动态分析,拟合了土体的位移轨迹。同时,通过设置局部摄像头,观测分析了在桩土界面的扰动薄层位移特征。研究表明:土体的水平位移随桩体的压入逐渐增大至稳定。当桩径一致时,方桩具有比圆桩更强的挤土作用,且在土体深处两者的差异更为明显。但当排土体积一致时,方桩与圆桩之间的差异较小。桩–土界面扰动层厚度约为5.7~8.6倍平均粒径,层内土体随桩体压入向下移动;当桩体穿过观察区后,扰动层位移逐渐减小。
Based on the digital image correlation technology,the displacement information of the soil in the model pile tests is obtained without marking and touching the surface,and the displacement laws of the soil is analyzed.The calculation program is compiled by using the MATLAB.The soil displacement and its change at any position and at any time in the tests can be extracted by calculation.In addition,the soil displacement caused by different pile types and different diameters is dynamically analyzed,and the displacement trajectory of the soil is fitted.At the same time,by setting up a local camera,the disturbance layer at the pile-soil interface is observed and analyzed.The study shows that the horizontal displacement of soil increases gradually to stability during pile press-in.When the diameter of the pile is the same,the soil-squeezing effect of the square pile is obviously stronger than that of the circular pile,and the difference between them is more obvious at the deep depth of the soil.But when the discharge volume is the same,the difference between the square pile and the circular pile is small.The thickness of the disturbance layer is about 5.7~8.6 d50 and the soil in this layer moves downward when the pile passes through,the displacement of the layer gradually decreases.
作者
姜赟
陆烨
唐侨楚
王校勇
JIANG Yun;LU Ye;TANG Qiao-chu;WANG Xiao-yong(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;SGIDI Engineering Consulting(Group)Co.,Ltd.,Shanghai 200093,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2020年第S01期208-213,共6页
Chinese Journal of Geotechnical Engineering
基金
上海市自然科学基金项目(16ZR1411900)
关键词
非接触测试技术
静压桩
土体位移
桩–土界面
non-contact testing technology
press-in pile
soil displacement
pile-soil interface
