| 变截面劲性水泥土桩承载特性室内模型试验研究 |
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| 引用本文： | 孙涛,杨俊杰,赵宏,孙太亮.变截面劲性水泥土桩承载特性室内模型试验研究[J].中国海洋大学学报(自然科学版),2012,42(5):20-27. |
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| 作者姓名： | 孙涛 杨俊杰 赵宏 孙太亮 |
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| 作者单位： | 1. 青岛市勘察测绘研究院,山东青岛266032;青岛岩土工程技术研究中心,山东青岛266033
2. 中国海洋大学环境科学与工程学院,山东青岛266100;中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 |
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| 摘 要： | 研究变截面劲性水泥土桩的几何特征对承载特性的影响,结果表明:具有1个扩大盘或2个扩大盘间距较大的变截面桩,盘下部的土体发生压缩和局部剪切破坏现象,上部的土体则发生梨形滑落;盘间距较小时,上下两盘之间的土体与两盘成为一体;变截面桩的桩侧荷载分担值均远大于桩端荷载分担值,盘的数量及间距对桩侧及桩端荷载分担值影响不大;1个盘时,其位置对承载力有一定的影响;2个等间距盘的变截面桩,盘位置越高承载力越高;盘间距对承载力影响不显著;3个盘的承载力大于2个盘的承载力,但结果相差不大;变截面桩的承载力得到显著提高,其承载力不小于与扩大盘直径相等的等截面桩;随着桩顶荷载的增大,盘承担的荷载增加显著,盘以下桩身的轴力因盘承担大部分而骤减,其降低幅度与盘的数量、位置及间距有关.
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| 关 键 词： | SRC桩 承载特性 模型试验 几何特征 |
Study on Compressive Load-Bearing Characteristics of Section-Variable Reinforced Jet-Grouting & Mixing Cement-Soil Pile by Indoor Model Tests |
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| SUN Tao
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YANG Jun-Jie
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ZHAO Hong
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SUN Tai-Liang.Study on Compressive Load-Bearing Characteristics of Section-Variable Reinforced Jet-Grouting & Mixing Cement-Soil Pile by Indoor Model Tests[J].Periodical of Ocean University of China,2012,42(5):20-27. |
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| Authors: | SUN Tao YANG Jun-Jie ZHAO Hong SUN Tai-Liang |
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| Institution: | 3,4(1.Qingdao Geotechnical Investigation and Surveying Research Institute,Qingdao 266032,China;2.Qingdao Geotechnicae Engineering Research Center,Qingdao 266033,China;3.College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;4.The Key Laboratory of Marine Environment and Ecology,Ministry of Education,Qingdao 266100,China) |
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| Abstract: | Modeling tests were carried out in laboratory,and results showed that for a variable-section pile with one enlarging plate or two enlarging plates which were wide apart,the soil mass under the plates was compressed,while the soil mass upon the plates tended to collapse in a pear shape.When the plates were close to each other,the soil mass between them integrated with them.The side friction of the variable-section pile was much higher than pile end resistance,regardless of the quantity of plates or interval between them.For the variable-section pile with one enlarging plate,bearing capacity of the pile was concentrated around the plate,especially when the plate was constructed in the middle of the pile and the bearing capacity was relatively large.For the variable-section pile with two enlarging plates,the plates in the upper section had higher bearing capacity than those in the lower section,and so they should be constructed in the upper section;interval between the plates influenced the bearing capacity in an insignificant way.For the variable-section pile with three enlarging plates,its bearing capacity was a bit higher than that with two plates.The bearing capacity of variable-section pile has been greatly enhanced to the degree of being equivalent with the uniform-section pile of the same diameter as the enlarging plate.Distribution of axial stress along variable-section pile is different from that of uniform-section pile.With the increasing of load level,the axial stress under the plates decreases sharply due to the bearing capacity of the plates. |
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| Keywords: | SRC pile load-bearing characteristics model tests geometric shapes |
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