膨胀土区域路堑换填厚度分析

田海波; 王炳龙; 许恺

膨胀土区域路堑换填厚度分析

同济大学道路与交通工程教育部重点实验室, 上海 200092

基金项目:

铁道部科技研究开发计划项目 2005G018

详细信息

中图分类号: U213.14
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- 被引次数: 0
出版历程
- 收稿日期: 2005-08-13
- 刊出日期: 2006-06-25

Replacement thickness analysis of cutting in expansive soil area

Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 综合考虑膨胀土地基的强度、刚度及变形要求, 基于膨胀力平衡原理及控制轨道变形两种方法, 分析、计算了路堑换填厚度, 研究了不同换填厚度和膨胀力条件下路基膨胀变形, 结合新建合(合肥) 宁(南京) 铁路路堑试验段进行原位动载试验, 实测、评价、计算换填厚度下路基强度、弹性变形等动力学特性。结果表明, 在计算换填厚度条件下, 路基在200万次循环荷载作用下累计塑性变形为0.65 mm, 弹性变形最大为0.62 mm, 路基表现出了较好的稳定性和动力特性, 采用60 cm厚的石灰改良膨胀土填料换填路基能够满足强度、刚度要求, 按控制轨道变形方法计算换填厚度是合理的, 膨胀变形是路堑换填厚度的主要影响因素。
- 铁道工程 /
- 换填厚度 /
- 原位试验 /
- 膨胀土 /
- 路堑 /
- 有限元方法
Abstract: The inflexibility, intensity and deformation of expansive subgrade were taken into account, the reasonable replacement thickness of cutting in expansive soil area was deduced by expansive force balance theory and allowing rail deformation method, the expansive deformation of subgrade under different replacement thicknesses and expansive forces was researched by FEM, the inflexibility, intensity and deformation of subgrade were evaluated by in-situ test along Hefei-Nanjing railway in China. The result indicates that the muximum elastic deformation is 0.62 mm and the total plastic deformation is 0.65 mm when the subgrade is acted by 2 million times circular loads, the subgrade presents a good performance of stability and dynamics. It is feasible that the lime soil is taken as subgrade replacement material when its thickness is 60 cm, the expansive soil deformation is the main factor to determine the replacement thickness of cutting.
- railway engineering /
- replacement thickness /
- in-situ test /
- expansive soil /
- cutting /
- FEM

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图 1 有限元计算模型

Figure 1. Computation model of FEM

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图 2 路基变形

Figure 2. Subgrade deformation

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图 3 应力分布

Figure 3. Stress distribution

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图 4 路堑结构

Figure 4. Cutting structure

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图 5 路基动态加载方式

Figure 5. Dynamic loading model of subgrade

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图 6 弹性变形

Figure 6. Elastic deformation

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图 7 塑性变形

Figure 7. Plasticity deformation

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表 1 路基参数

Table 1. Subgrade parameters

位置	K₃₀/ (MPa·m^-1)	E₀/MPa	ρ/ (kg·m^-3)	μ	c/kPa	φ/ (°)
道床		100	2200	0.30	0.0	42.0
基床表层	190	100	2400	0.15	36.2	13.0
基床底层	110	54	2000	0.30	24.0	7.5
地基	60	46	1800	0.35	7.1	3.5
轨枕		15000	1269	0.18

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表 2 计算结果

Table 2. Computation result

计算断面	地基膨胀力/kPa	换填厚度/m	轨道变形/mm
1	30	0.6	0.758
2	50	0.4	1.856
3	50	0.5	1.554
4	50	0.6	1.251
5	60	0.6	1.497
6	70	0.5	2.168
7	70	0.6	1.744
8	70	0.7	1.317

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参考文献(7)

[1]	汪双杰, 黄晓明, 倪一鸿. 改性膨胀土路基受水特性[J]. 交通运输工程学报, 2004, 4(1): 15-20. doi: 10.3321/j.issn:1671-1637.2004.01.005 Wang Shuang-jie, Huang Xiao-ming, Ni Yi-hong. Infiltrating properties of modified swelling soil subgrade[J]. Journal of Traffic and Transportation Engineering, 2004, 4(1): 15-20. (in Chinese) doi: 10.3321/j.issn:1671-1637.2004.01.005
[2]	郭志勇. 膨胀土改性试验及动力特性[J]. 长安大学学报: 自然科学版, 2003, 23(4): 18-21. doi: 10.3321/j.issn:1671-8879.2003.04.005 Guo Zhi-yong. Experiment and dynamic properties of improved expansive soil[J]. Journal of Chang'an University: Natural Science Edition, 2003, 23(4): 18-21. (in Chinese) doi: 10.3321/j.issn:1671-8879.2003.04.005
[3]	王哲人, 曹建新, 王龙, 等. 级配碎石混合料的动力变形特性[J]. 中国公路学报, 2003, 16(1): 22-26. doi: 10.3321/j.issn:1001-7372.2003.01.006 Wang Zhe-ren, Cao Jian-xin, Wang Long, et al. Dynamic deformation characteristic of grading macadam mixture[J]. China Journal of Highway and Transport, 2003, 16(1): 22-26. (in Chinese) doi: 10.3321/j.issn:1001-7372.2003.01.006
[4]	雷胜友, 惠会清. 膨胀土及其改良土静动力特性对比分析[J]. 岩石力学与工程学报, 2004, 23(17): 3 003-3 008. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200417026.htm Lei Sheng-you, Hui Hui-qing. Dynamostatic analysis of properties of expansive soil and improved soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(17): 3 003-3 008. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200417026.htm
[5]	王国强. 安徽省江淮地区膨胀土的工程性质研究[J]. 岩土工程学报, 1999, 21(1): 119-121. doi: 10.3321/j.issn:1000-4548.1999.01.026 Wang Guo-qiang. Study on engineering properties of expansive soil in Yangtzs-Huaihe region of Anhui Province[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(1): 119-121. (in Chinese) doi: 10.3321/j.issn:1000-4548.1999.01.026
[6]	徐永福. 膨胀土地基承载力研究[J]. 岩石力学与工程学报, 2000, 19(3): 387-390. doi: 10.3321/j.issn:1000-6915.2000.03.030 Xu Yong-fu. Study on bearing capacity of expansive soil basement[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(3): 387-390. (in Chinese) doi: 10.3321/j.issn:1000-6915.2000.03.030
[7]	陈果, 翟婉明. 250 km/h高速铁路轨道不平顺的安全管理[J]. 西南交通大学学报, 2001, 36(5): 495-499. doi: 10.3969/j.issn.0258-2724.2001.05.011 Chen Guo, Zhai Wan-ming. Safety management of track irregularities of 250 km/h high-speed railway[J]. Journal of Southwest Jiaotong University, 2001, 36(5): 495-499. (in Chinese) doi: 10.3969/j.issn.0258-2724.2001.05.011