Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (4): 376–383.doi: 10.3724/SP.J.1226.2015.00376

• ARTICLES • 上一篇    

Refreezing of cast-in-place piles under various engineering conditions

Lei Guo1,2, QiHao Yu1, XiaoNing Li1,2, XinBin Wang1, YongYu Yue1,2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2015-03-05 修回日期:2015-05-15 发布日期:2018-11-23
  • 通讯作者: Ph.D., QiHao Yu, Prof. of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. Tel/Fax: +86-931-4967283; E-mail: yuqh@lzb.ac.cn E-mail:yuqh@lzb.ac.cn
  • 基金资助:
    The project was supported by the National Key Basic Research Program of China (973 Program)(No. 2012CB026106), the National Natural Science Foundation of China (Grant No. 41171059), and the Fund of the State Key Laboratory of Frozen Soil Engineering (No. SKLFSE-ZY-16).

Refreezing of cast-in-place piles under various engineering conditions

Lei Guo1,2, QiHao Yu1, XiaoNing Li1,2, XinBin Wang1, YongYu Yue1,2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-03-05 Revised:2015-05-15 Published:2018-11-23
  • Contact: Ph.D., QiHao Yu, Prof. of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. Tel/Fax: +86-931-4967283; E-mail: yuqh@lzb.ac.cn E-mail:yuqh@lzb.ac.cn
  • Supported by:
    The project was supported by the National Key Basic Research Program of China (973 Program)(No. 2012CB026106), the National Natural Science Foundation of China (Grant No. 41171059), and the Fund of the State Key Laboratory of Frozen Soil Engineering (No. SKLFSE-ZY-16).

摘要: In the construction of the Qinghai-Tibet Power Transmission Line (QTPTL), cast-in-place piles (CIPPs) are widely applied in areas with unfavorable geological conditions. The thermal regime around piles in permafrost regions greatly affects the stability of the towers as well as the operation of the QTPTL. The casting of piles will markedly affect the thermal regime of the surrounding permafrost because of the casting temperature and the hydration heat of cement. Based on the typical geological and engineering conditions along the QTPTL, thermal disturbance of a CIPP to surrounding permafrost under different casting seasons, pile depths, and casting temperatures were simulated. The results show that the casting season (summer versus winter) can influence the refreezing process of CIPPs, within the first 6 m of pile depth. Sixty days after being cast, CIPPs greater than 6 m in depth can be frozen regardless of which season they were cast, and the foundation could be refrozen after a cold season. Comparing the refreezing characteristics of CIPPs cast in different seasons also showed that, without considering the ground surface conditions, warm seasons are more suitable for casting piles. With the increase of pile depth, the thermal effect of a CIPP on the surrounding soil mainly expands vertically, while the lateral heat disturbance changes little. Deeper, longer CIPPs have better stability. The casting temperature clearly affects the thermal disturbance, and the radius of the melting circle increases with rising casting temperature. The optimal casting temperature is between 2℃ and 9 ℃.

关键词: cast-in-place pile, hydration heat, refreezing, engineering factor, permafrost

Abstract: In the construction of the Qinghai-Tibet Power Transmission Line (QTPTL), cast-in-place piles (CIPPs) are widely applied in areas with unfavorable geological conditions. The thermal regime around piles in permafrost regions greatly affects the stability of the towers as well as the operation of the QTPTL. The casting of piles will markedly affect the thermal regime of the surrounding permafrost because of the casting temperature and the hydration heat of cement. Based on the typical geological and engineering conditions along the QTPTL, thermal disturbance of a CIPP to surrounding permafrost under different casting seasons, pile depths, and casting temperatures were simulated. The results show that the casting season (summer versus winter) can influence the refreezing process of CIPPs, within the first 6 m of pile depth. Sixty days after being cast, CIPPs greater than 6 m in depth can be frozen regardless of which season they were cast, and the foundation could be refrozen after a cold season. Comparing the refreezing characteristics of CIPPs cast in different seasons also showed that, without considering the ground surface conditions, warm seasons are more suitable for casting piles. With the increase of pile depth, the thermal effect of a CIPP on the surrounding soil mainly expands vertically, while the lateral heat disturbance changes little. Deeper, longer CIPPs have better stability. The casting temperature clearly affects the thermal disturbance, and the radius of the melting circle increases with rising casting temperature. The optimal casting temperature is between 2℃ and 9 ℃.

Key words: cast-in-place pile, hydration heat, refreezing, engineering factor, permafrost

Chen ZY, Li GY, Mu YH, et al., 2014. Impact of molding temperature and hydration heat of concrete on thermal properties of pile foundation in permafrost regions along the Qinghai-Tibet DC Interconnection Project. Journal of Glaciology and Geocryology, 36(4): 818-827.DOI:10.7522/j.issn.1000-0240.2014.0098.
Chen ZY, Li GY, Yu QH, et al., 2013.Study of the thermal stability of cast-in-place pile foundations of the Qinghai-Tibet DC Transmission Project in permafrost regions. Journal of Glaciology and Geocryology, 35(5): 1209-1218.DOI:10.7522/j.issn.1000-0240.2013.0136.
Cheng GD, Ma W, 2006. Frozen soil engineering problems in construction of the Qinghai-Tibet Railway. Chinese Journal of Nature, 28(6): 315-320.
Ding JK, Han LW, Xu BK, et al.,2011. Permafrost and Railways. Beijing: China Railway Publishing House.
Grigor'ev VS, Ol'shanskii VG, Starostenkov AD, et al., 2012.Experience in 110-500 kV overhead transmission line construction and renovation projects. Power Technology and Engineering, 46(4): 317-320.
He F, 2013. Experimental Research on Regular Patterns of Water Migration and Mechanism of the Formation of Ice Films between Different Mediums in Freezing Silty Clay. M.S. Thesis, Lanzhou Jiaotong University, Lanzhou, China.
He JH, He JH, 2010. Study on the calculation method of the hydrate heat and adiabatic temperature rise of concrete. Science and Technology Information, 21:465-466.
Jia XY, LiWJ, ZhuYQ, 2003. Analysis on hydration influence of grouting pile concrete in permafrost regions. Journal of Shijiazhuang Railway Institute, 16(4): 88-90.
Jiang HP, Liu ZR, 2006. ±500 kV direct current transmission line ground and foundation design in frozen earth area. Inner Mongolia Electric Power, 24(4):1-4.
Li N, Xu B, 2008. A new type of pile used in frozen soil foundation. Cold Regions Science and Technology, 53(3): 355-368. DOI:10.1016/j.coldregions.2007.10.005.
Liu J, Chen B, 2010. Numerical simulation on the temperature of massive concrete. China Concrete and Cement Products, (5):15-27.
Lyazgin AV, Lyashenko VS, Ostroborodov SV, et al., 2004. Experience in the prevention of frost heave of pile foundations of transmission towers under northern conditions. Power Technology and Engineering, 38(2): 124-126.
Ma BG, Wang YF, 2003. Research on thermal effect to frozen earth ground work produced by concrete engineering. Low Temperature Architecture Technology, (1):4-7.
Ma H, Liao XP, Lai YM, 2005. Temperature control problem of concrete of pile foundation under construction in the permafrost regions of the Qinghai-Tibet Railway. Journal of Glaciology and Geocryology, 27(2): 176-181.
Mu YH, Ma W, Niu FJ, 2014. Study on geotechnical hazards to roadway engineering in permafrost regions. Journal of Disaster Prevention and Mitigation Engineering, 34(3):259-267.
Qin DH, Ding YH, Wang SW, et al., 2002. A study of environment change and its impacts in western China. Earth Science Frontiers, 9(2): 321-328.
Shi HS, Huang XY, 2009. Study process on the hydration heat of Portland cement. Cement, (12):4-10.
Wang GS, Yu QH, You YH, et al., 2014. Problems and countermeasures in construction of transmission line projects in permafrost regions. Sciences in Cold and Arid Regions, 6(5): 432-439. DOI: 10.3724/SP.J.1226.2014.00432.
Wen Z, Sheng Y, Ma W, et al., 2007. Study on deformation characters of railway insulated embankment in permafrost regions. Journal of Rock Mechanics and Engineering, 187(8):1670-1677.
Wen Z,Yu QH, Li GY,et al., 2013. Stresses and deformations of a tower foundation subject to frost action in permafrost regions. In: Leung CF, Goh SH, Shen RF (eds.). Advances in Geotechnical Infrastructure. Singapore: Research Publishing Services, pp. 835-840. DOI:10.3850/978-981-07-4948-4_022.
Wu QB, Liu YZ, Zhang JM, et al., 2002. A review of recent frozen soil engineering in permafrost regions along Qinghai-Tibet Highway, China. Permafrost and Periglacial Processes, 13(3): 199-205. DOI: 10.1002/ppp.420.
Wu YP, Su Q, Guo CX, et al., 2006. Nonlinear analysis of ground refreezing process for pile group bridge foundation in permafrost. China Civil Engineering Journal, 39(2):78-84.
Xu CH, 2009. Research on axial bearing behavior of cast-in-place concrete piles in permafrost regions. Ph.D. Thesis, Harbin Institute of Technology, Harbin, China.
Xu CH, Xu XY, Qiu MG, et al., 2007. Numerical analysis of adfreezing force of engineering pile in permafrost. Journal of Harbin Institute of Technology, 39(4):542-545.
Xu XZ, Wang JC, Zhang LX, et al., 2010. Physics of Frozen Soil. Beijing: Science Press.
Yu QH, You YH, Ding YS, et al., 2013. Analysis of heat transfer characteristics of frozen soil foundation in Qinghai-Tibet DC Transmission Line Project. Chinese Journal of Rock Mechanics and Engineering, 32(S2): 4025-4031.
Yuan XZ, Ma W, Liu YZ, 2005. Study on thermal regime of high-temperature frozen soil during construction of cast-in-place pile. Chinese Journal of Rock Mechanics and Engineering, 24(6):1052-1055.
Zhang MY, Lai YM, Gao ZH, et al., 2006. Influence of boundary conditions on the cooling effect of crushed-rock embankment in permafrost regions of Qinghai-Tibetan Plateau. Cold Regions Science and Technology, 44(3): 225-239. DOI:10.1016/j.coldregions.2005.12.002.
Zhang XF, Lai YM, Yu WB, et al., 2004. Numerical analysis for the hydration heat of cast-in-situ concrete foundations of culverts on the Qinghai-Tibet Railway. Journal of Glaciology and Geocryology, 26(1):106-111.
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