| 修正剑桥模型在DPC桩—土结构层中的应用分析 |
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| 引用本文： | 胡贺松,廖湘英,陈晓斌.修正剑桥模型在DPC桩—土结构层中的应用分析[J].地质力学学报,2018,24(6):849-854. |
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| 作者姓名： | 胡贺松 廖湘英 陈晓斌 |
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| 作者单位： | 广州市建筑科学研究院有限公司, 广东 广州 510440,中南大学土木工程学院, 湖南 长沙 410083,中南大学土木工程学院, 湖南 长沙 410083 |
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| 基金项目： | 广东特支计划资助项目（2014TQ01Z014，2015B020238014）；国家自然科学基金（5167082383） |
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| 摘 要： | 针对DPC桩-土结构层开展大型直剪试验，基于试验分析，在考虑DPC桩-土结构层注浆影响上引入临界应力比，构建了可描述应变软化的修正剑桥模型应力应变方程。直剪试验表明DPC桩-土结构层剪切特性表现为剪切软化，具有明显的峰值强度和残余强度，呈现出明显的结构性，其特征与超固结的黏土的剪切应力应变曲线特性类似。推导出的修正剑桥模型能较好的解释实验结果，所得出的结论对DPC桩的设计有一定的指导意义。
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| 关 键 词： | 随钻跟管桩 桩侧注浆 桩-土结构层 直剪试验 剑桥模型 |
| 收稿时间： | 2018/6/10 0:00:00 |
| 修稿时间： | 2018/10/10 0:00:00 |
THE APPLICATION OF MODIFIED CAM-CLAY MODEL IN DPC PILE-SOIL INTERFACE |
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| HU Hesong,LIAO Xiangying and CHEN Xiaobin.THE APPLICATION OF MODIFIED CAM-CLAY MODEL IN DPC PILE-SOIL INTERFACE[J].Journal of Geomechanics,2018,24(6):849-854. |
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| Authors: | HU Hesong LIAO Xiangying and CHEN Xiaobin |
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| Institution: | Guangzhou Institute of building science, Guangzhou 510440, Guangdong, China,School of Civil Engineering, Central South University, Changsha 410083, Hunan, China and School of Civil Engineering, Central South University, Changsha 410083, Hunan, China |
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| Abstract: | A series of large direct shear tests were carried out for the DPC pile-soil structure layer. Based on the experimental analysis, the critical stress ratio was introduced considering the influence of DPC pile-soil layer grouting, and a modified cam-clay model which can describe the strain softening was constructed. The direct shear tests show that the shear behavior of DPC pile-soil structure layer is shear softening, with obvious peak strength and residual strength, and the structure layer shows structural properties. The results of these tests are well reflected in the modified Cam-clay model. The conclusion has guiding significance for the design of DPC piles. |
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| Keywords: | Drilling with pre-stressed concrete Pile Cased lateral pile grouting pile-soil structure layer direct shear test cam-clay model |
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