修正剑桥模型在DPC桩—土结构层中的应用分析

胡贺松; 廖湘英; 陈晓斌

doi:10.12090/j.issn.1006-6616.2018.24.06.088

修正剑桥模型在DPC桩—土结构层中的应用分析

doi: 10.12090/j.issn.1006-6616.2018.24.06.088

1.
广州市建筑科学研究院有限公司, 广东广州 510440
2.
中南大学土木工程学院, 湖南长沙 410083

基金项目:

广东特支计划资助项目 2014TQ01Z014

广东特支计划资助项目 2015B020238014

国家自然科学基金 5167082383

详细信息

作者简介:
胡贺松(1979-), 男, 工学博士, 教授级高工, 主要研究岩土工程施工。E-mail:hesonghu79@126.com

中图分类号: U43
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- 文章访问数: 267
- HTML全文浏览量: 195
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2018-06-10
- 修回日期: 2018-10-10
- 刊出日期: 2018-12-01

THE APPLICATION OF MODIFIED CAM-CLAY MODEL IN DPC PILE-SOIL INTERFACE

1.
Guangzhou Institute of building science, Guangzhou 510440, Guangdong, China
2.
School of Civil Engineering, Central South University, Changsha 410083, Hunan, China

摘要

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。
- 随钻跟管桩 /
- 桩侧注浆 /
- 桩-土结构层 /
- 直剪试验 /
- 剑桥模型
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.
- Drilling with pre-stressed concrete Pile Cased /
- lateral pile grouting /
- pile-soil structure layer /
- direct shear test /
- cam-clay model

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图 1 DPC桩—土结构层示意图

Figure 1. sketch of DPC pile-soil structural layer

下载: 全尺寸图片幻灯片

图 2 试验土级配曲线

Figure 2. Gradation curves of the tested soils

下载: 全尺寸图片幻灯片

图 3 大型剪切试验仪器及试样

a—TYJ-800剪切仪；b—试样

Figure 3. The large-scale direct shear test device and the specimen

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图 4 DPC桩—粉质黏土结构层应力应变曲线

a—注浆前DPC桩—土结构层；b—注浆后DPC桩—土结构层

Figure 4. Stress-strain curves of the DPC pile-silty clay structural layer

下载: 全尺寸图片幻灯片

图 5 DPC桩—素填土结构层应力应变曲线

Figure 5. Stress-strain curves of the DPC pile-plain fill structural layer

下载: 全尺寸图片幻灯片

图 6 DPC桩—土结构层屈服面扩展

Figure 6. Expansion of yield surface of DPC pile-soil structural layer

下载: 全尺寸图片幻灯片

图 7 模型预测与实验值对比

a—DPC桩—粉质黏土结构层；b—DPC桩—素填土结构层

Figure 7. Predicted stress-strain curves and tested stress-strain curves

下载: 全尺寸图片幻灯片

表 1 试验土的基本物理力学参数值

Table 1. The fundamental physical and mechanical parameters of the tested soils

桩周土	最优含水率/%	最大干密度/ (g·cm³)	液限 W_L	塑限 W_P	粘聚力/ kPa	内摩擦角/ (°)
粉质黏土	18.5	1.71	24.1	16.53	11.6	31
素填土	14.4	1.88	40.7	25.1	23.1	33

下载: 导出CSV

表 2 模型参数值

Table 2. Values of the model parameters

DPC桩—结构层	λ	κ	e₀	v	M	M_z	β	η
DPC桩—粉质粘土	0.11	0.025	0.66	0.30	0.24	1.7	0.35	1.50
DPC桩—素填土	0.12	0.021	0.58	0.25	0.92	2.3	0.30	1.33

下载: 导出CSV

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