›› 2018, Vol. 39 ›› Issue (4): 1377-1385.doi: 10.16285/j.rsm.2016.1114

• Geotechnical Engineering • Previous Articles     Next Articles

In-situ monitoring and analysis of permanent subgrade deformation in seasonally frozen regions

MENG Shang-jiu1, 2, LI Xiang2, SUN Yi-qiang1, CHENG You-kun1   

  1. 1. College of Civil Engineering and Architecture, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, China; 2. School of Measurement-Control Technology and Communications Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, China
  • Received:2016-05-16 Online:2018-04-11 Published:2018-06-06
  • Supported by:

    This work was supported by the Natural Science Foundation of Heilongjiang Province of China (E2016045) and the National Natural Science Foundation of China (51378164).

Abstract: Using the fiber Bragg grating sensors, a two-year in-situ monitoring for the subgrade permanent deformation in seasonally frozen regions was conducted. The combined effects of different sites, periods of a year, and different axial loads were considered. The results indicat that: 1) Affected by the air temperature, the subgrade’s temperature varies linearly but astatically with time in the freezing and melting periods. During a cycle of freezing and thawing, the range of ground temperature in the urban district at a depths of 30 cm and 75 cm are -9.0-14.4 ℃ and -1.9-15.4 ℃, respectively. The response of ground temperature to air temperature decreases and the hysteresis increases with the depth. 2) When the subgrade is fully frozen, the vehicle load-induced permanent deformation at both sites are small. However, when it is thawing, the deformation rises even under the same load. The maximum deformation is 4.5 and 4.2 times that of the frozen and normal period, respectively. 3) After two cycles of freezing and thawing, the subgrade has not reached a steady state. The permanent deformation under heavy vehicles can not be ignored. 4) Taking the maximum permanent subgrade deformation induced by a vehicle of 40 kN axial load as reference, the measured values caused by the 80 kN and 250 kN increase 17 and 215 times, respectively. There is a nonlinear relationship between the permanent deformation and axial load. 5) The combination of freezing and thawing cycles with heavy vehicle loading will produce the worst result, which can magnify the permanent subgrade deformation.

Key words: subgrade in seasonally frozen regions, permanent deformation, freeze-thaw cycles, heavy vehicles

CLC Number: 

  • P 642.14

[1] SUN Jing, GONG Mao-sheng, XIONG Hong-qiang, GAN Lin-rui, . Experimental study of the effect of freeze-thaw cycles on dynamic characteristics of silty sand [J]. Rock and Soil Mechanics, 2020, 41(3): 747-754.
[2] ZHANG Feng-rui, JIANG An-nan, YANG Xiu-rong, SHEN Fa-yi. Experimental and model research on shear creep of granite under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2020, 41(2): 509-519.
[3] LI Jie-lin, ZHU Long-yin, ZHOU Ke-ping, LIU Han-wen, CAO Shan-peng, . Damage characteristics of sandstone pore structure under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2019, 40(9): 3524-3532.
[4] WANG Zhen, ZHU Zhen-de, CHEN Hui-guan, ZHU Shu, . A thermo-hydro-mechanical coupled constitutive model for rocks under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2019, 40(7): 2608-2616.
[5] GAO Feng, XIONG Xin, ZHOU Ke-ping, LI Jie-lin, SHI Wen-chao, . Strength deterioration model of saturated sandstone under freeze-thaw cycles [J]. Rock and Soil Mechanics, 2019, 40(3): 926-932.
[6] YE Wan-jun, LI Chang-qing, YANG Geng-she, LIU Zhong-xiang, PENG Rui-qi. Scale effects of damage to loess structure under freezing and thawing conditio [J]. , 2018, 39(7): 2336-2343.
[7] WANG Peng, XU Jin-yu, FANG Xin-yu, WANG Pei-xi, LIU Shao-he, WANG Hao-yu,. Water softening and freeze-thaw cycling induced decay of red-sandstone [J]. , 2018, 39(6): 2065-2072.
[8] YIN Guang-zhi, WANG Wen-song, WEI Zuo-an, CAO Guan-sen,ZHANG Qian-gui, JING Xiao-fei,. Analysis of the permanent deformation and stability of high tailings dam under earthquake action [J]. , 2018, 39(10): 3717-3726.
[9] XU Lei, LIU Si-hong, LU Yang, SONG Ying-jun, YANG Qi. Physico-mechanical properties of expansive soil under freeze-thaw cycles [J]. , 2016, 37(S2): 167-174.
[10] ZHAN Gao-feng, ZHANG Qun, ZHU Fu, DONG Wei-zhi. Research on influence of freeze-thaw cycles on static strength of lime-treated silty clay [J]. , 2015, 36(S2): 351-356.
[11] ZHANG Lian-hai ,MA Wei ,YANG Cheng-song,. Pore water pressure measurement for soil subjected to freeze-thaw cycles [J]. , 2015, 36(7): 1856-1864.
[12] SUN Lei , CAI Yuan-qiang , WANG Jun , GUO Lin,. Effects of cyclic confining pressure on permanent deformation of saturated soft clay [J]. , 2015, 36(2): 437-443.
[13] FANG Yun , QIAO Liang , CHEN Xing , YAN Shao-jun , ZHAI Guo-lin , LIANG Ya-wu,. Experimental study of freezing-thawing cycles on sandstone in Yungang grottos [J]. , 2014, 35(9): 2433-2442.
[14] LU Ya-ni ,LI Xin-ping ,WU Xing-hong,. Fracture coalescence mechanism of single flaw rock specimen due to freeze-thaw under triaxial compression [J]. , 2014, 35(6): 1579-1584.
[15] YAN Han ,WANG Tian-liang , LIU Jian-kun ,WANG Yang , . Experimental study of dynamic parameters of silty soil subjected to repeated freeze-thaw [J]. , 2014, 35(3): 683-688.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!