非埋式桩板结构路基承载机制

苏谦; 王武斌; 白皓; 廖超; 赵伟

doi:10.19818/j.cnki.1671-1637.2012.01.004

非埋式桩板结构路基承载机制

doi: 10.19818/j.cnki.1671-1637.2012.01.004

苏谦^{1, 2,},
王武斌²,
白皓²,
廖超²,
赵伟²

1.
西南交通大学高速铁路线路工程教育部重点实验室, 四川成都 610031
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重点项目 2006G004-B

铁道部科技研究开发计划重点项目 2008G031-C

中央高校基本科研业务费专项资金项目 SWJTU09CX004

详细信息

作者简介:
苏谦(1972-), 男, 山西芮城人, 西南交通大学教授, 工学博士, 从事铁路路基结构研究

中图分类号: U213.14
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- 被引次数: 0
出版历程
- 收稿日期: 2011-09-12
- 刊出日期: 2012-02-25

Bearing capacity mechanism of non-embedded pile-plank structure subgrade

SU Qian^{1, 2
,},
WANG Wu-bin²,
BAI Hao²,
LIAO Chao²,
ZHAO Wei²

1.
Key Laboratory of High-speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

More Information

Author Bio:
SU Qian(1972-), male, professor, PhD, +86-28-87602673, suqian@126.com

摘要

摘要: 为了研究深厚湿陷性黄土地基非埋式桩板结构路基的承载机制, 选取试验段典型断面进行元器件布置与长期观测; 考虑桩土相互作用, 依据等刚度的原则引入综合转动刚度的概念, 建立了纵、横向平面分析模型, 对非埋式桩板结构的受力与变形特性进行测试分析。实测结果表明: 结构主筋应力测试值与理论值相差10%~30%, 吻合较好, 最大值出现在托梁支座断面上侧, 为60.60MPa; 桩侧土体承受约95%的荷载, 且未产生负摩阻力; 桩板结构的荷载传递规律与传统路基不同, 桩基将荷载传递到更深的持力层, 改善了路基软弱土体部分的受力状态; 轨道结构完工半年后, 承台板顶面最大累计沉降出现在中跨跨中断面, 为1.0mm, 满足沉降控制要求。
- 非埋式桩板结构 /
- 深厚湿陷性黄土 /
- 现场试验 /
- 承载机制 /
- 变形特性 /
- 荷载传递规律
Abstract: Sensor components were disposed at the typical section of test subgrade, and the bearing capacity mechanism of non-embedded pile-plank structure in deep collapsible loess foundations was studied by long-term observation.The pile-soil interaction was considered, the concept of comprehensive rotation stiffness was introduced based on the principle of equal stiffness, the vertical and horizontal plane models of the subgrade were installed, and the deformation and mechanical characteristic of the structure were analyzed.Measured result shows that the test value of structural main reinforcement stress agree well with the theoretical calculation value, the difference is about 10%-30%, and the maximum reinforcement stress of 60.60 MPa appears at the cross section of joist.Pile side earth bears about 95% of total load, and no negative friction is produced.The load transfer law of the structure is different from that of traditional subgrade, load can be transferred to deeper bearing layer by pile foundation, which improves the stress state of soft soil section.Half a year, after the laying completion of track construction, the largest accumulated settlement of top surface for bearing plank occurs at the cross section of mid-span, which is 1.0 mm, and meets the requirement of settlement control.
- non-embedded pile-plank structure /
- deep collapsible loess /
- field test /
- bearing capacity mechanism /
- deformation properties /
- load transfer law

HTML全文

图 1 纵断面结构

Figure 1. Vertical section structure

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图 2 测点布置

Figure 2. Arrangement of measuring points

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图 3 纵断面二维模型

Figure 3. 2D model of vertical section

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图 4 横断面二维模型

Figure 4. 2D model of cross section

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图 5 板土接触应力时程曲线

Figure 5. Time-history curves of plank-soil contact stresses

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图 6 承台板主筋应力时程曲线

Figure 6. Time-history curves of reinforcement stresses of plank

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图 7 托梁主筋应力时程曲线

Figure 7. Time-history curves of reinforcement stresses of joist

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图 8 弯矩分布曲线

Figure 8. Distribution curves of bending moments

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图 9 桩基主筋应力时程曲线

Figure 9. Time-history curves of reinforcement stresses of pile

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图 10 桩基轴力分布曲线

Figure 10. Distribution curves of axial forces of pile

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图 11 桩基摩阻力分布曲线

Figure 11. Distribution curves of friction resistances of pile

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图 12 总沉降分布曲线

Figure 12. Distribution curves of total settlements

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表 1 物理力学指标

Table 1. Physico-mechanical parameters

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