摘要
通过中砂与结构物接触面半模直剪试验,结合数字照相变形量测DPDM(Digital Picture Deformation Measurement)技术,对各级荷载下砂土在直剪试验中的变形场进行失效分析。采用数码相机对半模试验过程中砂与剪切面运动进行全程拍摄,应用DPDM技术对拍摄结果进行处理,得出土体的位移场和应变场云图,发现砂土的位移量和剪应变量达到最大值的区域总是发生在结构物中部附近,且在到达该最大值后,其变化不再随着相对位移的增加而发生变化。说明当土与结构物相互作用过程中土体总位移分布不再发生变化时,土与结构物相互作用失效;土体最大剪应变呈明显的袋状分布,且当分布不随相对位移的增加而发生变化时,土与结构物相互作用失效。
By carrying out half - model direct shear tests of contact surfaces between medium sand soil and structures and using Dig- ital Picture Deformation Measurement （DPDM） technology, failure analysis of deformation field of the sand soil in the tests at different load levels was made. Digital cameras were used to photograph the whole moving process of medium sand soil on the shear surface, and DPDM technology was used to process the photos. Based on that, nephograms of displacement field and strain field of the soil mass were obtained. We found that the maximum displacement and shearing strain of the sand soil always occurred in the area located around the middle part of the structures, and that, after the maximum values were reached, they no longer changed with the increase of relative displacement. This indicates that, when the total displacement distribution of soil mass stays unchanged in the interaction process of soil and structures, the interaction between soil and structures would fail ; in addition, the maximum shearing strain of soil mass presents an obvious bag-shaped distribution, and the interaction between soil and structures would fail when the distribution does not change with the increase of relative displacement.
出处
《内蒙古农业大学学报（自然科学版）》
CAS
2016年第2期74-78,共5页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
国家自然科学基金资助(项目批准号:51078228)
国家海洋公益性行业科研专项经费项目(201105024-5)
2013年上海市研究生教育创新计划实施项目(第二批
20131129)
关键词
中砂与结构物
相互作用
单调剪切
场云图
失效分析
Medium sand and structure
interaction
monotonic shearing
field image
failure analysis
