| 扩底抗拔桩动态变形全过程承载特性模型试验研究 |
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| 引用本文： | 宋琦,杨俊杰,孙涛,李飞,杨宁晔.扩底抗拔桩动态变形全过程承载特性模型试验研究[J].中国海洋大学学报(自然科学版),2021(5). |
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| 作者姓名： | 宋琦 杨俊杰 孙涛 李飞 杨宁晔 |
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| 作者单位： | 中国海洋大学海洋环境与生态教育部重点实验室;中国海洋大学环境科学与工程学院;山东科技大学地球科学与工程学院 |
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| 基金项目： | 国家自然科学基金项目(51779235);国家自然科学基金青年项目(41602322);山东科技大学人才引进科研启动基金项目(2015RCJJ010)资助。 |
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| 摘 要： | 利用砂土中扩底抗拔桩的模型试验,研究从开始加载到破坏时扩底抗拔桩地基动态变形全过程的承载特性。试验结果表明:半模试验得到的极限荷载和破坏面均略小于全模试验结果,采用半模试验测量地基变形过程与破坏模式有明显优势,用半模试验代替全模试验是可行的;随着桩顶荷载的增加,扩大头上方的土体由压缩变形逐渐发展为局部的压缩—剪切破坏;扩大头对其上部的桩侧摩阻力有增强作用,对其下部的桩侧摩阻力有削弱作用;扩大头在工作荷载、极限荷载和破坏荷载作用时分担的荷载比例为15%~20%。
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| 关 键 词： | 扩底桩 抗拔桩 承载特性 变形全过程 模型试验 |
Model Tests on Bearing Behavior of Dynamic Deformation Process of Uplift Piles with Enlarged Base |
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| SONG Qi,YANG Jun-Jie,SUN Tao,LI Fei,YANG Ning-Ye.Model Tests on Bearing Behavior of Dynamic Deformation Process of Uplift Piles with Enlarged Base[J].Periodical of Ocean University of China,2021(5). |
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| Authors: | SONG Qi YANG Jun-Jie SUN Tao LI Fei YANG Ning-Ye |
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| Institution: | (Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China) |
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| Abstract: | The model tests of uplift piles with enlarged base in sand were carried out.The bearing behavior of the whole process of dynamic deformation of the foundation with uplifted piles from the beginning of loading to the failure was studied.The test results show that the ultimate load and failure surface obtained by the half-model test are slightly smaller than the full-model test results.The half-model test has obvious advantages in measuring the deformation process and failure mode of the foundation.It is feasible to replace the full-mode test with the half-model test.With the increase of the load on pile top,the soil above the enlarged head gradually develops from compression deformation to local compression-shear deformation.The enlarged head has a reinforcing effect on the pile side friction of the upper part,and has a weakening effect on the pile side friction of the lower part.In the case of working load,ultimate load and failure load,the load ratio of the enlarged head is 15%~20%. |
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| Keywords: | enlarged base pile uplift pile bearing behavior whole process of deformation model tests |
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