桩板结构路基桩-土工作特性

詹永祥; 蒋关鲁

doi:10.19818/j.cnki.1671-1637.2009.04.008

桩板结构路基桩-土工作特性

doi: 10.19818/j.cnki.1671-1637.2009.04.008

詹永祥^1,,
蒋关鲁²

1.
重庆大学土木工程学院, 重庆 400030
2.
西南交通大学土木工程学院, 四川成都 610031

基金项目:

铁道部科技研究开发计划项目 2005K004-C

重庆大学高层次人才科研基金项目 0903005104831

详细信息

作者简介:
詹永祥(1979-), 男, 安徽淮南人, 重庆大学讲师, 工学博士, 从事岩土工程与高速铁路路基工程研究

中图分类号: U213.1
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- 被引次数: 0
出版历程
- 收稿日期: 2009-03-21
- 刊出日期: 2009-08-25

Pile-soil interacton properties of pile-plank embankment

ZHAN Yong-xiang^1
,,
JIANG Guan-lu²

1.
School of Civil Engineering, Chongqing University, Chongqing 400030, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

More Information

Author Bio:
ZHAN Yong-xiang(1979-), male, lecturer, PhD, +86-544-8271345, zhanyongxiang@126.com

摘要

摘要: 为了掌握在列车荷载作用下无碴轨道桩板结构路基的工作性状, 以遂渝高速铁路为背景, 通过室内大比例动态模型试验, 加载频率为5 Hz, 激振20万次, 研究了桩板结构路基桩-土工作特性变化规律。试验结果表明: 在荷载激振1万次后, 动位移幅值、桩身轴力、桩间土动应力随着振动次数的增加几乎不变, 桩-土共同作用趋于稳定; 桩间土的动应力沿深度近似呈“K”形分布, 与土体相比, 桩分担了大多数动力荷载, 激振位置对动应力有影响; 桩基加深了基床的动力影响范围, 改善了路基土体的受力状态。
- 高速铁路 /
- 无碴轨道 /
- 桩板结构路基 /
- 模型试验 /
- 桩-土共同作用
Abstract: In order to investigate the mechanical behavior of pile-plank embankment for high-speed ballastless track under moving load, based on Suining-Chongqing High-speed Railway, the pile-soil interaction characteristics of pile-plank embankment were researched by indoor great scale dynamic model test, in which the loading frequency is 5 Hz and the loading times are 2×105.Test result indicates that the amplitude of dynamic displacement, pile shaft force, dynamic stress in soil between piles remain constant after 1×104 times of vibrant loading, and pile-soil interaction tends toward stability.The amplitude curve of dynamic stress is approximately "K" form with the depth in soil between piles, piles share most dynamic stress compared with soil, and dynamic stress is affected by loading position.Pile structure expands the depth of the dynamic response of roadbed and improves the stress state of roadbed soil.
- high speed railway /
- ballastless track /
- pile-plank embankment /
- model test /
- pile-soil interaction

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图 1 原型桩板结构路基

Figure 1. Prototype pile-plank embankment

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图 2 桩板结构路基模型剖面

Figure 2. Section of pile-plank embankment

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图 3 测量仪器布置

Figure 3. Distribution of measured apparatus

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图 4 动位移与振动次数的关系

Figure 4. Relationship between dynamic displacement and loading time

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图 5 桩间土动应力沿深度分布

Figure 5. Distribution of dynamic stress in soil between piles with depth

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图 6 桩身轴力分布

Figure 6. Distribution of pile shaft force

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图 7 动应力与振动次数关系

Figure 7. Relationship between dynamic stress and loading time

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表 1 路基填料和地基土层物理力学参数

Table 1. Physical and mechanical parameters of fillings and groundsill soils

土类型	厚度/m	密度/(g·cm^-3)	压缩模量/MPa	泊松比	粘聚力/kPa	内摩擦角/(°)	摩擦因数
川东红层填料	6.0	2.16	70.00	0.20	30.00	30.00	0.4
川东红层填料	8.0	2.16	70.00	0.20	30.00	30.00	0.4
软塑状粉质粘土	1.0	1.83	2.51	0.40	7.20	5.83	0.2
粉质粘土	1.7	2.00	4.49	0.35	32.07	11.05	0.3
硬塑状粉质粘土	2.3	1.97	5.25	0.35	26.08	17.49	0.3
泥岩夹砂岩	持力层	2.20	100.00	0.20	20.00	55.00	0.5

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参考文献(11)

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