A study on impacts of groundwater seepage on artificial freezing process of gravel strata
), Abstract
This paper aims to study the impacts of groundwater seepage on artificial freezing process of gravel strata, the temperature field characteristics of the strata, and the strata process, closure time and thickness evolution mechanism of the frozen wall.
In this paper several laboratory model tests were conducted, considering different groundwater seepage rate.
The results show that there is a significant coupling effect between the cold diffusion of artificial freezing pipes and groundwater seepage; when there is no seepage, temperature fields upstream and downstream of the gravel strata are symmetrically distributed, and the thickness of the frozen soil column/frozen wall is consistent during artificial freezing; groundwater seepage causes significant asymmetry in the temperature fields upstream and downstream of the gravel strata, and the greater the seepage rate, the more obvious the asymmetry; the frozen wall closure time increases linearly with the increase in the groundwater seepage rate, and specifically, the time length under seepage rate of 5.00 m d−1 is 3.2 times longer than that under no seepage; due to the erosion from groundwater seepage, the thickness of the upstream frozen wall decreases linearly with the seepage velocity, while that of the downstream frozen wall increases linearly, resulting in a saddle-shaped frozen wall.
The research results are beneficial to the optimum design and risk control of artificial freezing process in gravel strata.
Keywords
References
Chen, R., Cheng, G., Li, S., Guo, X., & Zhu, N. (2000). Development and prospect of research on application of artificial ground freezing. Chinese Journal of Geotechnical Engineering, 22(1), 40–44.
Frivik, P., & Comini, G. (1982). Seepage and heat flow in soil freezing. Journal of Heat Transfer, 104(2), 323–328.
Li, F., Ding, H., & Zhang, X. (2019). Model test research of strata law of double-row-pipe freezing wall in water rich sand layer under seepage. Chinese Journal of Rock Mechanics and Engineering, 38(2), 386–395.
Li, F., Luo, F., & Han, Y. (2010). Cause analysis and countermeasure research for unclosed freezing wall of subway contact passage under complex conditions. Industrial Construction, 45(11), 187–190.
Li, P., & Xie, X. (2012). Research on optimization of freezing-temperature monitoring design and method of data analysis in Shanghai Yangtze River Tunnel. Chinese Journal of Underground Space and Engineering, 8(1), 122–128.
Liu, J., Liu, Q., Zhou, D., & Zhu, X. (2017). Influence of groundwater transverse horizontal flow velocity on the strata of artificial horizontal freezing wall. Journal of Basic Science and Engineering, 25(2), 258–265.
Ma, Q. (2007). Theory and construction technology of artificial freezing method. Beijing: China Communications Press.
Marwan, A., Zhou, M., Abdelrehim, M., & Meschke, G. (2016). Optimization of artificial ground freezing in tunneling in the presence of seepage flow. Computers and Geotechnics, 75, 112–125.
Pimentel, E., Sres, A., & Anagnostou, G. (2012). Large-scale laboratory tests on artificial ground freezing under seepage-flow conditions. Géotechnique, 62(3), 227–241.
Qin, W., Yang, P., Jin, M., Zhang, T., & Wang, H. (2010). Application and survey analysis of freezing method applied to ultra-long connected aisle in metro tunnel. Chinese Journal of Underground Space and Engineering, 6(5), 1065–1071.
Sudisman, R., Osada, M., & Yamabe, T. (2017). Heat transfer visualization of the application of a cooling pipe in sand with flowing pore water. Journal of Cold Regions Engineering, 31(1), 04016007.
Wang, J., Zhou, G., Xu, J., & Liu, F. (2011). Progress of the research on analog simulation experimentation for frozen wall in deep alluvium. Journal of Glaciology and Geocryology, 33(4), 941–946.
Yan, Q., & Fang, X. (2012). Thermal-solid coupling analysis of the connected cross aisle in metro constructed by horizontal freezing in ground. China Railway Science, 33(1), 54–59.
Yang, P., & Pi, A. (2001). Study on the effects of large groundwater flow velocity on the strata of frozen wall. Chinese Journal of Geotechnical Engineering, 23(2), 167–171.
Yao, Z., Cai, H., Cheng, H., & Ma, J. (2011). Construction technique for the shallow-buried subway tunnel with large-section by long-distance horizontal ground freezing method and undermining method. China Railway Science, 32(1), 75–80.
Zhang, S., Yue, Z., Zhang, J., Sun, T., & Wang, L. (2020). Distribution of soil temperature field close to tunnel end and optimization of segment insulation measures in cross-passage construction by artificial ground freezing method. China Railway Science, 41(3), 95–102.
Zhao, L. (2004). Application of freezing method in Shenzhen metro undercut tunnel. West-China Exploration Engineering, 10, 99–102.
Zhou, X., Wang, M., & Zhang, X. (2005). Model test research on the strata of freezing wall in seepage ground. Journal of China Coal Society, 30(2), 196–201.
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