Analysis of LongTerm Deformation of Railway Embankment at Repeated Train Load in Permafrost Regions

Abstract

Abstract:

Abstract： Based on strong motion tests on typical embankment at Beilu River segment along the QinghaiTibet Railroad, the acceleration history waveforms near railway tracks were collected when the train was passing, and the dynamic train load was converted into equivalent creep stress by using the equivalent static force method. Moreover, the creep equation of frozen soil was introduced according to the result of frozen soil rheological triaxial tests. The longterm deformation of the embankment at the train load was obtained, and the ratio of permanent deformation at the train load to the whole embankment deformation was quantized as well. The research results show that the vibration effect of repeated train load on deformation accounted for approximately 10% of the total accumulative settlement of the embankment. The creep strain values at the slope toes are significant and extended upwards gradually, which increases with the development of time and the strain rate decreases instead.

Key words: permafrost, train load, long-term deformation, creep effect

CLC Number:

TU 43

WU Zhijian1,2,3,CHEN Tuo4，MA Wei5. Analysis of LongTerm Deformation of Railway Embankment at Repeated Train Load in Permafrost Regions[J]. Journal of Shanghai Jiaotong University, 2015, 49(07): 929-934.

References

［1］陈国栋. 青藏铁路工程与多年冻土相互作用及环境效应［J］. 中国科学院院刊, 2002(1): 2125.

CHENG Guodong. The interacting of QinghaiTibet railway and permafrost and the environmental effect［J］. Publication of Chinese Academy of Sciences, 2002(1):2125.

［2］施烨辉.列车荷载和冻融循环作用下冻土路基稳定性研究［D］.北京:北京交通大学土木建筑工程学院, 2011.

［3］古海东. 轨道交通荷载作用下冻土路基的动力反应分析［D］. 哈尔滨:哈尔滨工业大学土木工程学院，2009.

［4］王铁行,胡长顺,李宁. 冻土路基应力变形数值模型［J］. 岩土工程学报, 2002,24(2):193 197.

WANG Tiehang, HU Changshun, LI Ning. Stressstrain numerical model for frozen soil subgrade［J］. Chinese Jounal of Geotechnical Engineering, 2002,24(2)：193197.

［5］朱占元. 青藏铁路列车行驶多年冻土场地路基振动反应与振陷预测［D］. 哈尔滨:哈尔滨工业大学土木工程学院,2009.

［6］王立娜,凌贤长,张峰，等. 大庆季节冻土区冬季铁路列车行驶振动反应现场监测研究［J］. 中国科技论文在线,2009,4(7):507511.

WANG Lina, LING Xianchang, ZHANG Feng, et al. Field monitoring on vibration acceleration response of railway in seasonal frozen region of Daqing induced by trainsteering in winter［J］.Science Paper Online,2009,4(7):507511.

［7］吴志坚,陈拓,马巍. 机车荷载作用下青藏铁路多年冻土区普通路基的蠕变分析［J］.岩土力学,2011,32(Sup.2):8387.

WU Zhijian, CHEN Tuo, MA Wei. The creep analysis of plain fill embankment at the permafrost regions along QinghaiTibet Railway under train dynamic load［J］. Rock and Soil Mechanics, 2011,32(Sup.2):8387.

［8］郑波,张建明,马小杰. 高温高含冰量冻土压缩变形特性研究［J］. 岩石力学与工程学报, 2009, 28(Sup.1): 30643069.

ZHENG Bo, ZHANG Jianming, MA Xiaojie, et al. Study on compression deformation of warm and icerich frozen soil［J］. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(Sup.1): 30643069.

［9］李双洋.多年冻土区铁路路基热力稳定性数值仿真研究［D］. 兰州:中国科学院寒区旱区环境与工程研究所, 2007.

［10］廖公云,黄晓明. ABAQUS有限元软件在道路工程中的应用［M］. 南京:东南大学出版社,2008.

［11］张建明,刘端,齐吉琳. 青藏铁路冻土路基沉降变形预测［J］. 中国铁道科学,2007,28(3)：1217.

ZHANG Jianming, LIU Duan, QI Jilin. Estimation on the settlement and deformation of embankment along QinghaiTibet Railway in permafrost regions［J］. China Railway Science, 2007, 28(3): 1217.

［12］张清林,白晨光,王海峰. 土体试样蠕变过程的试验研究［J］. 实验室科学, 2012, 15(2): 7780.

ZHANG Qinglin, BAI Chenguang, WANG Haifeng. Test research of soil under triaxial impact loading［J］. Laboratory Science, 2012,15(2):7780.

［13］郑波,张建明,马小杰. 多年冻土区铁路路基沉降变形研究与思考［J］. 中国安全科学学报, 2006, 26(12):140144.

ZHENG Bo，ZHANG Jianming,MA Xiaojie. Studying and thinking on settlement of railway roadbed in permafrost regions［J］. China Safety Science Journal, 2006,16(12)：140144.

［14］马小杰. 高温高含冰量冻土强度及蠕变特性［D］. 兰州:中国科学院寒区旱区环境与工程研究所, 2006.

［15］TB10001—2005,铁路路基设计规范［S］.

［16］孙志忠,马巍,党海明,等. 青藏铁路多年冻土区路基变形特征及其来源［J］. 岩土力学, 2013, 34(9): 26672671.

SUN Zhizhong, MA Wei, DANG Haiming, et al. Characteristics and causes of embankment deformation for QinghaiTibet railway in permafrost regions［J］. Rock and Soil Mechanics, 2013, 34(9): 26672671.

[1]	CAO Weiwei, LI Mingguang, WU Wei, XIA Xiaohe, SHI Yujin . Safety Evaluation Method for Long-Term Operation of Metro Based on Combination Weighting Method [J]. J Shanghai Jiaotong Univ Sci, 2020, 25(6): 700-705.
[2]	LI Lei1,2,ZHANG Mengxi1,WU Huiming2. Influence of Metro Train Loading Calculation Methods on Dynamic Responses of Shield Tunnel [J]. Journal of Shanghai Jiaotong University, 2015, 49(07): 1030-1034.
[3]	NIU Fu-jun1,3 (牛富俊), SUN Hong2* (孙红), GE Xiu-run2 (葛修润), ZHANG Jin-zhao3 (章金钊). Temperature Adjustment Mechanism of Composite Embankment with Perforated Ventilation Pipe and Blocky Stone [J]. Journal of shanghai Jiaotong University (Science), 2013, 18(6): 729-732.
[4]	WANG Jian-Wei, JIN Xian-Long, CAO Lu-Fen, ZHANG Wei-Wei. Parallel Computation for the Dynamic Response of Connectional Passage in Twin-Tunnel due to Train Load [J]. Journal of Shanghai Jiaotong University, 2012, 46(04): 591-595.