循环荷载下压实粉土的动态特性

关彦斌; 肖军华; 陈建国

doi:10.19818/j.cnki.1671-1637.2009.02.006

循环荷载下压实粉土的动态特性

doi: 10.19818/j.cnki.1671-1637.2009.02.006

1.
北京工业大学建筑工程学院, 北京 100022
2.
南京工业大学土木工程学院, 江苏南京 210009
3.
石家庄铁道学院土木工程分院, 河北石家庄 050043

基金项目:

铁道部科技研究开发计划项目 2005G012

详细信息

作者简介:
关彦斌(1974-), 男, 黑龙江哈尔滨人, 北京工业大学讲师, 工学博士, 博士后, 从事路基路面工程研究

中图分类号: U213.14
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出版历程
- 收稿日期: 2008-11-08
- 刊出日期: 2009-04-25

Dynamic characters of compacted silt under cyclic load

1.
School of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China
2.
School of Civil Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China
3.
School of Civil Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, Hebei, China

More Information

Author Bio:
GUAN Yan-bin(1974-), male, lecturer, PhD, +86-10-67396960, guanyb163@163.com

摘要

摘要: 为了研究交通循环荷载下黄河冲积粉土的动态特性, 基于室内应力控制式动三轴试验, 并考虑动应力、含水率两个因素的变化, 研究了压实粉土的累积塑性变形、回弹模量及临界动应力的变化规律。试验结果表明: 循环荷载下压实粉土的累积变形与动应力、含水率的高低均有关, 动应力越大, 累积变形随含水率增加而增长较快; 压实粉土的回弹模量随动应力增加而缓慢降低, 随含水率增加线性减小; 压实粉土的临界动应力随含水率增加线性降低。
- 铁道工程 /
- 粉土 /
- 动三轴试验 /
- 累积变形 /
- 回弹模量 /
- 临界动应力
Abstract: In order to investigate the dynamic characters of compacted silt under cyclic load, the variations of its dynamic stress and water content were considered. The cumulative plastic deformation, resilient modulus and critical dynamic stress of compacted silt were studied based on stress-controlled dynamic triaxial test in laboratory. Test result shows that the cumulative deformation of compacted silt is closely related with its dynamic stress and water content. The higher its dynamic stress is, the faster the growth speed of its cumulative deformation with the increase of its water content is. The resilient modulus of compacted silt decreases gradually with the increase of its dynamic stress, and decreases linearly with the increase of its water content. Its critical dynamic stress of compacted silt also decreases linearly with the increase of its water content.
- railway engineering /
- silt /
- dynamic triaxial test /
- cumulative deformation /
- resilient modulus /
- critical dynamic stress

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图 1 荷载循环次数与累积应变关系

Figure 1. Relations between load cycles and cumulative strains

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图 2 含水率对累积应变的影响

Figure 2. Effect of water content on cumulative strain

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图 3 动应力对回弹模量的影响

Figure 3. Effect of dynamic stress on resilient modulus

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图 4 含水率对回弹模量的影响

Figure 4. Effect of water content on resilient modulus

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图 5 饱和度对临界动应力的影响

Figure 5. Effect of saturation on critical dynamic stress

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表 1 粉土的基本物理力学性质指标

Table 1. Basic physical-mechanical indices of silt

试样编号	相对密度	液限/%	塑限/%	塑性指数	颗粒百分比/%			最优含水率/%	最大干密度/(g·cm^-3)
试样编号	相对密度	液限/%	塑限/%	塑性指数	0.075~30.250 mm	0.005~0.075 mm	< 0.005 mm	最优含水率/%	最大干密度/(g·cm^-3)
1	2.657	30.4	21.4	9.0	11.38	78.71	9.91	11.96	1.87
2	2.643	29.5	20.8	8.7	19.73	66.80	13.47
3	2.623	27.6	20.7	6.9	20.99	70.85	8.16

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表 2 试验条件及理由

Table 2. Test conditions and reasons

试验条件	理由
动应力σ_d不小于30 kPa	路基面的动应力水平
频率f为1 Hz	交通荷载下路基面为低频动荷载, 且频率影响不大^[7]
围压σ₃为20 kPa	符合现场路基侧向应力条件, 且围压影响不大^[8]
循环次数N为10 000	考虑循环荷载长期作用的影响
压实系数K为0.90	既有铁路路基基床平均压实系数
含水率w不小于最优含水率w_opt	路基遇不利季节含水率增大, 更易产生破坏
固结不排水(CU)	交通荷载下路基中的水来不及排出

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参考文献(18)

[1]	肖军华, 刘建坤, 彭丽云, 等. 黄河冲积粉土的干密度及含水率对力学性质影响[J]. 岩土力学, 2008, 29(2): 409-414. XI AOJun-hua, LI UJian-kun, PENG Li-yun, et al. Effect of dry density and moisture content on behaviors of Yellow River alluvial silt[J]. Rock and Soil Mechanics, 2008, 29(2): 409-414. (in Chinese)
[2]	彭丽云, 刘建坤, 肖军华, 等. 京九线路基压实粉土力学特性的试验[J]. 北京交通大学学报, 2007, 31(4): 56-60. https://www.cnki.com.cn/Article/CJFDTOTAL-BFJT200704015.htm PENG Li-yun, LIUJian-kun, XIAOJun-hua, et al. Mechanics properties of compacted silt on Beijing-Kowloon railway[J]. Journal of Beijing Jiaotong University, 2007, 31(4): 56-60. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BFJT200704015.htm
[3]	贾永刚, 董好刚, 单红仙, 等. 黄河三角洲粉质土硬壳层特征及成因研究[J]. 岩土力学, 2007, 28(10): 2029-2035. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200710003.htm JI A Yong-gang, DONG Hao-gang, SHAN Hong-xian, et al. Study of characters andformation mechanismof hard crust on tidal flat of Yellow River estuary[J]. Rock and Soil Mechanics, 2007, 28(10): 2029-2035. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200710003.htm
[4]	商庆森, 朱海波, 杜红庆. 行车荷载和填筑高度对粉性土路堤变形的影响[J]. 公路交通科技, 2004, 21(1): 22-25. https://www.cnki.com.cn/Article/CJFDTOTAL-GLJK200401007.htm SHANG Qing-sen, ZHU Hai-bo, DU Hong-qing. Effect of traffic load and fill height on the silt embankment s defor-mation[J]. Journal of Highway and Transportation Research and Development, 2004, 21(1): 22-25. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-GLJK200401007.htm
[5]	王立军. 重载铁路路基评估的试验研究[D]. 北京: 中国铁道科学研究院, 2005. WANG Li-Jun. Experi mental study of subgrade evaluation of heavy weight railway[D]. Beijing: China Academy of Railway Sciences, 2005. (in Chinese)
[6]	申爱琴, 郑南翔, 苏毅, 等. 含砂低液限粉土填筑路基压实机理及施工技术研究[J]. 中国公路学报, 2000, 13(4): 12-15. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200004002.htm SHEN Ai-qin, ZHENG Nan-xiang, SU Yi, et al. Study of compacting mechanismand construction technology of filling road bed with bearing sand silt of lowliquid li mit[J]. China Journal of Highway and Transport, 2000, 13(4): 12-15. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200004002.htm
[7]	李美江. 道路材料振动压实特性研究[D]. 西安: 长安大学, 2002. LI Mei-jiang. Study of vibrating compaction of road materials[D]. Xi an: Chang an University, 2002. (in Chinese)
[8]	曹卫东. 低液限粉土填筑路基压实性能的研究[D]. 济南: 山东大学, 2002. CAO Wei-dong. Study on compaction characters of lowliquid li mit silt[D]. Jinan: Shangdong University, 2002. (in Chinese)
[9]	孙海军. 粉土稳定技术研究[D]. 南京: 东南大学, 2002. SUN Hai-jun. Study of stabilization techniques of silt[D]. Nanjing: Southeast University, 2002. (in Chinese)
[10]	朱志铎, 刘松玉, 孙海军. 江苏徐宿地区粉土的基本特性及加固方法研究[J]. 岩土力学, 2004, 25(7): 1155-1158. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX20040700X.htm ZHUZhi-duo, LIUSong-yu, SUN Hai-jun. Study of stabilized silt in Xu-Su area[J]. Rock and Soil Mechanics, 2004, 25(7): 1155-1158. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX20040700X.htm
[11]	曾长女, 刘汉龙, 周云东. 粉土动力特性研究综述[J]. 防灾减灾工程学报, 2005, 25(1): 99-104. https://www.cnki.com.cn/Article/CJFDTOTAL-DZXK20050100H.htm ZENG Chang-nu, LI U Han-long, ZHOU Yun-dong. Review of silty soil dynamic characteristics[J]. Journal of Disaster Prevention and Mitigation Engineering, 2005, 25(1): 99-104. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DZXK20050100H.htm
[12]	张洪亮, 郭忠印, 高启聚, 等. 重复荷载作用下砂土永久变形预估模型[J]. 交通运输工程学报, 2008, 8(3): 58-62. http://transport.chd.edu.cn/article/id/200803013 ZHANG Hong-liang, GUO Zhong-yin, GAO Qi-ju, et al. Permanent deformation prediction model of sandy soil under repeated load[J]. Journal of Traffic and Transportation Engineering, 2008, 8(3): 58-62. (in Chinese) http://transport.chd.edu.cn/article/id/200803013
[13]	MONISMITH C L, OGAWA N, FREEME C R. Permanent deformation characteristics of subgrade soils due to repeated loading[C]//TRB. TRR537. Washington DC: NRC, 1975: 1-17.
[14]	MUHANNA A S, RAHMAN MS, LAMBE P C. Resilient modulus and permanent strain of subgrade soils[C]//TRB. TRR1619. Washington DC: NRC, 1998: 85-93.
[15]	QI U Yan-jun, DENNIS N D, ELLIOTT R P. Deformation characteristics of subgrade soils under repeated loading[J]. Geotechnical Engineering, 1999, 30: 85-97.
[16]	WERKMEISTER S, DAWSON A R, WELLNER F. Pavement design model for unbound granular materials[J]. Journal of Transportation Engineering, 2004, 130(5): 665-674.
[17]	邱延峻, 孙振堂. 柔性路面路基土的永久变形[J]. 西南交通大学学报, 2000, 35(2): 116-120. https://www.cnki.com.cn/Article/CJFDTOTAL-XNJT200002001.htm QI U Yan-jun, SUN Zhen-tang. Permanent deformation of subgrade soils in flexible pavement[J]. Journal of Southwest Jiaotong University, 2000, 35(2): 116-120. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XNJT200002001.htm
[18]	WERKMEISTER S, DAWSON A R, WELLNER F. Pavement design model for unbound granular materials[J]. Journal of Transportation Engineering, 2004, 130(5): 665-674.