冻融循环对不同塑性指数路基土动力特性影响

王静; 刘寒冰; 吴春利; 曲肖龙

doi:10.11779/CJGE201404006

冻融循环对不同塑性指数路基土动力特性影响 English Version

1. 吉林建筑大学交通科学与工程学院,吉林长春 130118; 2. 吉林大学交通学院,吉林长春130022; 3. 吉林省交通规划设计院,吉林长春130022

基金项目: 国家自然科学基金项目（51308256）

详细信息

作者简介:
王静(1980- ),女,吉林柳河人,博士研究生,从事道桥结构动态优化设计理论及应用研究。E-mail: wangjing0062@sina.com。

通讯作者:
刘寒冰

中图分类号: TU435；U416.03
计量
- 文章访问数: 415
- HTML全文浏览量: 3
- PDF下载量: 424
出版历程
- 收稿日期: 2013-06-02
- 发布日期: 2014-04-21

Influence of freeze-thaw cycles on dynamic characteristics of subgrade soils with different plasticity indices

1. School of Communication Science & Engineering, Jilin Jianzhu University, Changchun 130118, China; 2. College of Transportation, Jilin University, Changchun 130022, China; 3. Jilin Communications Planning and Design Institute, Changchun 130021, China

摘要

摘要: 取季节性冻土区3种不同塑性指数路基土,在最佳含水率下制成压实度大于95%的试件,在经历不同次数完整冻融循环过程后,进行不同围压下的动三轴试验。试验结果表明：在加载初期,土的动模量（包含动弹性模量和动剪切模量）随着循环次数的增加呈下降趋势,随着动荷载次数的继续增加,动模量渐趋稳定。取荷载作用5000～6000次的动模量的平均值作为土在此状态下的稳定值,得出规律如下：季冻区压实路基土动模量随围压的增加而增大,随冻融循环次数的增加而减小,随塑性指数的增加而增加；阻尼比随冻融循环次数、围压及塑性指数均无明显规律可循。通过数据分析得到动模量与围压、塑性指数和冻融循环次数的关系式,对于季冻区缺乏动模量数据的路基土,可依此公式进行冻融循环后的动模量推算,进而为季冻区的路基设计提供参考。
- 季节性冻土区 /
- 冻融循环 /
- 塑性指数 /
- 动力特性
Abstract: The specimens with the maximum degree of compaction are prepared. Dynamic triaxial tests are carried out on the specimens under different confining pressures after 0 to 7-time complete freeze-thaw cycles. The test results show that at the initial stage, the dynamic moduli of the soils (including dynamic elastic modulus and dynamic shear modulus) exhibit a downward trend with the increase of the loading cycles. As the number of dynamic loads continues to increase, the dynamic modulus is stable. By taking the average dynamic moduli of 5000 to 6000 loading cycles as the soil dynamic properties in this state, the laws are summarized as follows: the dynamic moduli of the compacted soils in seasonally frozen region increase with the increase of the confining pressure, decrease with the increase of the number of the freeze-thaw cycles, and increase with the increase of the plasticity index. The damping ratio has no obvious rules to follow with the freeze-thaw cycles, confining pressure and plasticity index. The relationship among the dynamic moduli, confining pressure, plasticity index and number of freeze-thaw cycles is obtained though data analysis. It may provide a reference for the embankment design and construction in the seasonally frozen region.
- seasonally frozen soil region /
- freeze-thaw cycle /
- plasticity index /
- dynamic characteristic

HTML全文

参考文献(15)

[1]	ERIK Simonsen, VINCENT C Janoo. Resilient properties of unbound road materials during seasonal frost conditions[J]. Journal of Cold Regions Engineering, 2002, 16: 28-50.
[2]	毛雪松, 侯仲杰, 王威娜. 基于含水率和冻融循环的重塑土弹性模量试验研究[J]. 岩石力学与工程学报, 2009, 28(增刊2): 3585-3590. (MAO Xue-song, HOU Zhong-jie, WANG Wei-na. Experimental research on resilient modulus of remolded soil based on water content and freeze-thaw cycles[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S2): 3585-3590. (in Chinese))
[3]	KONRAD J M. Physical processes during freeze-thaw cycles in clayey silts[J]. Cold Regions Science and Technology, 1989, 16(3): 291-303.
[4]	齐吉琳, 张建明, 朱元林. 冻融作用对土结构性影响的土力学意义[J]. 岩石力学与工程学报, 2004, 22(增刊2): 2690-2694. (QI Ji-lin, ZHANG Jian-ming, ZHU Yuan-lin. Influence of freezing-thawing on soil structure and its soils mechanics significance[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 22(S2): 2690-2694. (in Chinese))
[5]	邴文山. 道路冻害与防治[M]. 哈尔滨: 哈尔滨工业大学出版社, 1991. (BING Wen-shan. Road frost damage and prevention[M]. Harbin: Harbin Institute of Technology Press, 1991. (in Chinese))
[6]	何岩. 聚丙烯纤维改良粉煤灰土动、静力学参数研究[D].长春: 吉林大学, 2010. (HE Yan. Dynamic and static mechanical properties study on polypropylene fiber improving fly ash soil[D]. Changchun: Jilin University, 2010. (in Chinese))
[7]	王大雁, 马巍, 常小晓, 等. 冻融循环作用对青藏黏土物理力学性质的影响[J]. 岩石力学与工程学报, 2005, 24(33): 4314-4319. (WANG Da-yan, MA Wei, CHANG Xiao-xiao, et al. Physico-mechanical properties changes of Qinghai-tibet clay due to cyclicfreezing and thawing[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(33): 4314-4319. (in Chinese))
[8]	穆彦虎, 马巍, 李国玉, 等. 冻融作用对压实黄土结构影响的微观定量研究[J]. 岩土工程学报, 2011, 33(12): 1919-1925. (MU Yan-hu, MA Wei, LI Guo-yu, et al. Quantitative analysis of impacts of freeze-thaw cycles upon microstructure of compacted loess[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1919-1925. (in Chinese))
[9]	赵刚, 陶夏新, 刘兵. 原状土冻融过程中水分迁移试验研究[J]. 岩土工程学报, 2009, 31(12): 1952-1957. (ZHAO Gang, TAO Xia-xin, LIU Bing. Experimental study on water migration in undisturbed soil during freezing and thawing process[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(12): 1952-1957. (in Chinese))
[10]	王效宾, 杨平, 王海波, 等. 冻融作用对黏土力学性能影响的试验研究[J]. 岩土工程学报, 2009, 31(11): 1768-1772. (WANG Xiao-bin, YANG Ping, WANG Hai-bo, et al. Experimental study on effects of freezing and thawing on mechanical properties of clay[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(11): 1768-1772. (in Chinese))
[11]	包卫星, 杨晓华, 谢永利. 典型天然盐渍土多次冻融循环盐涨试验研究[J]. 岩土工程学报, 2006, 28(11): 1991-1995. (BAO Wei-xing, YANG Xiao-hua, XIE Yong-li. Research on salt expansion of representative crude saline soil under freezing and thawing cycles[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(11): 1991-1995. (in Chinese))
[12]	王天亮, 刘建坤, 田亚护. 水泥及石灰改良土冻融循环后的动力特性研究[J]. 岩土工程学报, 2010, 32(11): 1733-1737. (WANG Tian-liang, LIU Jian-kun, TIAN Ya-hu. Dynamic properties of cement and lime-improved soil subjected to freeze-thaw cycles[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(11): 1733-1737. (in Chinese))
[13]	炳慧, 何平. 冻融循环对含盐土物理力学性质影响的试验研究[J]. 岩土工程学报, 2009, 31(12): 1958-1962. (BING Hui, HE Ping. Influence of freeze-thaw cycles on physical and mechanical properties of salty soil[J]. Chinese Journal of Geotechnical Engineering. 2009, 31(12): 1958-1962. (in Chinese))
[14]	王威娜, 支喜兰, 毛雪松, 等. 冻融循环作用下路基土回弹模量试验研究[J]. 冰川冻土, 2010, 32(5): 954-959. (WANG Wei-na, ZHI Xi-lan, MAO Xue-song, et al. Experimental study of resilience modulus of subgrade soil under circles of freezing and thawing[J]. Journal of Glaciology and Geocryology, 2010, 32(5): 954-959. (in Chinese))
[15]	戴文亭, 魏海斌, 刘寒冰, 等. 冻融循环下粉质黏土的动力损失模型[J]. 吉林大学学报（工学版）, 2007, 37(4): 790-793. (DAI Wen-ting, WEI Hai-bin, LIU Han-bing, et al. Dynamic damage model of silty clay after freeze-thaw cycles[J]. Journal of Jilin University (Engineering and Technology Edition), 2007, 37(4): 790-793. (in Chinese))