Experiment study on effects of freeze-thaw cycles on adfreezing strength at frozen soil-concrete interface
HE Peng-fei1,2,4, MA Wei2,4, MU Yan-hu2, DONG Jian-hua3, HUANG Yong-ting2,4
1. School of Science, Lanzhou University of Technology, Lanzhou 730050, China; 2. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; 3. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 4. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:In order to study the effects of freeze-thaw cycles on the adfreezing strength between frozen soil and concrete interface, a series of direct shear tests are conducted with different numbers of freeze-thaw cycles under different normal stresses, test temperatures and initial water contents. The peak shear strength, residual shear strength, shear strength parameters are used to analyze the adfreezing strength at the interface. The test results show that the shear behaviors of the interface are still strain-softening after 20 cycles. The influences of freeze-thaw cycles on the peak shear stress are stronger than those on the residual shear stress, indicating that they have an effect on the content of ice crystal of the interface. When the water content of the soil is low and the test temperature is high, the peak shear strength lightly increases with the increasing cycles, and it decreases obviously at water content of 20.8% and test temperature of -5℃. Therefore, it is necessary to pay attention to the influences of freeze-thaw cycles on the peak shear stress under high water content, low test temperature and small deformation of the structural interface. The cycles have few influences on the residual shear stress. The peak cohesions of the interface increase, become stable and decrease with the increasing cycles at the test temperature of -1℃, -3℃ and -5℃, respectively, which is presumed to be caused by the water migration of the soil near the interface. The peak and residual interface friction angles are influenced slightly by the cycles.
何鹏飞, 马巍, 穆彦虎, 董建华, 黄永庭. 冻融循环对冻土-混凝土界面冻结强度影响的试验研究[J]. 岩土工程学报, 2020, 42(2): 299-307.
HE Peng-fei, MA Wei, MU Yan-hu, DONG Jian-hua, HUANG Yong-ting. Experiment study on effects of freeze-thaw cycles on adfreezing strength at frozen soil-concrete interface. Chinese J. Geot. Eng., 2020, 42(2): 299-307.
[1] 周幼吾, 郭东信, 邱国庆, 等. 中国冻土[M]. 北京: 科学出版社, 2000. (ZHOU You-wu, GUO Dong-xin, QIU Guo-qing, et al.Geocryology in China[M]. Beijing: Science Press, 2000. (in Chinese)) [2] 马巍, 王大雁. 中国冻土力学研究50 a回顾与展望[J]. 岩土工程学报, 2012, 34(4): 625-640. (MA Wei, WANG Da-yan.Studies on frozen soil mechanics in China in past 50 years and their prospect[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(4): 625-640. (in Chinese)) [3] LAI Y, XU X, DONG Y, et al.Present situation and prospect of mechanical research on frozen soils in China[J]. Cold Regions Science and Technology, 2013, 87: 6-18. [4] 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(23): 4313-4319. (WANG Da-yan, MA Wei, CHANG Xiao-xiao, et al.Physico-mechanical properties changes of Qinghai- Tibet Clay due to cyclic freezing and thawing[J]. Chinese Journal of Geotechnical Engineering, 2005, 24(23): 4313-4319. (in Chinese)) [5] 常丹, 刘建坤, 李旭, 等. 冻融循环对青藏粉砂土力学性质影响的试验研究[J]. 岩石力学与工程学报, 2014, 33(7): 1496-1502. (CHANG Dan, LIU Jian-kun, LI Xu, et al.Experiment study of effects of freezing-thawing cycles on mechanical properties of Qinhai-Tibet silty sand[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(7): 1496-1502. (in Chinese)) [6] QI J, VERMEER P A, CHENG G.A review of the influence of freeze‐thaw cycles on soil geotechnical properties[J]. Permafrost and Periglacial Processes, 2006, 17(3): 245-252. [7] XIE S B, QIU J J, LAI Y M, et al.Effects of freeze- thaw cycles on soil mechanical and physical properties in the Qinghai-Tibet Plateau[J]. Journal of Mountain Science, 2015, 12(4): 999-1009. [8] 侯鑫, 马巍, 李国玉, 等. 冻融循环对硅酸钠固化黄土力学性质的影响[J]. 冰川冻土, 2018, 40(1): 86-93. (HOU Xin, MA Wei, LI Guo-yu, et al.Effects of freezing-thawing cycles on mechanical properties of loess solidified by sodium silicate[J]. Journal of Glaciology and Geocryology, 2018, 40(1): 86-93. (in Chinese)) [9] 刘晖, 刘建坤, 邰博文, 等.冻融循环对含砂粉土力学性质的影响[J]. 哈尔滨工业大学学报, 2018, 50(3): 135-142. (LIU Hui, LIU Jian-kun, TAI Bo-wen, et al.Mechanical properties changes of sandy silt due to freeze-thaw cycles[J]. Journal of Harbin Institute of Technology, 2018, 50(3): 135-142. (in Chinese)) [10] LU Z, XIAN S, YAO H, et al.Influence of freeze-thaw cycles in the presence of a supplementary water supply on mechanical properties of compacted soil[J]. Cold Regions Science and Technology, 2019, 157: 42-52. [11] PARAMESWARAN V R.Adfreeze strength of frozen sand to model piles[J]. Canadian Geotechnical Journal, 1978, 15(4): 494-500. [12] QIU M, LI H, WANG K, et al.Experimental study on failure pattern of piles in frozen soil[J]. Journal of Harbin University of Civil Engineering and Architecture, 1999, 32(5): 39-42. [13] ALDAEEF A A, RAYHANI M T.Influence of exposure temperature on shaft capacity of steel piles in ice-poor and ice-rich frozen soils[C]// International Congress and Exhibition" Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology". Cham, 2018: 247-257. [14] PENNER E, IRWIN W.Adfreezing of leda clay to anchored footing columns[J]. Canadian Geotechnical Journal, 1969, 6(3): 327-337. [15] BONDARENKO G I, SADOVSKII A V.Strength and deformability of frozen soil in contact with rock[J]. Soil Mechanics & Foundation Engineering, 1975, 12(3): 174–178. [16] BIGGAR K W, SEGO D C.The strength and deformation behaviour of model adfreeze and grouted piles in saline frozen soils[J]. Canadian Geotechnical Journal, 1993, 30(2): 319-337. [17] LADANYI B.Frozen soil-structure interfaces[J]. Studies in Applied Mechanics, 1995, 42(6): 3-33. [18] 吉延俊, 贾昆, 俞祁浩, 等. 现浇混凝土-冻土接触面冻结强度直剪试验研究[J]. 冰川冻土, 2017, 39(1): 86-91. (JI Yang-jun, JIA Kun, YU Qi-hao, et al.Direct shear tests of freezing strength at the interface between cast-in-situ concrete and frozen soil[J]. Journal of Glaciology and Geocryology, 2017, 39(1): 86-91. (in Chinese)) [19] WEN Z, YU Q, MA W, et al.Experimental investigation on the effect of fiberglass reinforced plastic cover on adfreeze bond strength[J]. Cold Regions Science and Technology, 2016, 131: 108-115. [20] 石泉彬, 杨平, 谈金忠, 等. 冻土与结构接触面冻结强度压桩法测定系统研制及试验研究[J]. 岩土工程学报, 2019, 41(1): 139-147. (SHI Quan-bin, YANG Ping, TAN Jin-zhong, et al.Development of measuring system by pile-pressing method and experimental study on adfreezing strength at interface between frozen soil and structure[J]. Chinese Journal Geotechnical Engineering, 2019, 41(1): 139-147. (in Chinese)) [21] 陈拓, 赵光思, 赵涛. 寒区黏土与结构接触面冻结强度特性试验研究[J]. 地震工程学报, 2018, 40(3): 512-518. (CHEN Tuo, ZHAO Guang-si, ZHAO Tao.Experimental study on the freezing strength characteristicof clay-structure interface in cold regions[J]. China Earthquake Engineering Journal, 2018, 40(3): 512-518. (in Chinese)) [22] 孙厚超, 杨平, 王国良. 冻土与结构接触界面层力学试验系统研制及应用[J]. 岩土力学, 2014, 35(12): 3636-3641. (SUN Hou-chao, YANG Ping, WANG Guo-liang.Development of mechanical experimental system for interface layer between frozen soil and structure and its application[J]. Rock and Soil Mechanics, 2014, 35(12): 3636-3641. (in Chinese)) [23] 孙厚超, 杨平, 王国良. 冻黏土与结构接触界面层单剪力学特性试验[J]. 农业工程学报, 2015, 31(9): 57-62. (SUN Hou-chao, YANG Ping, WANG Guo-liang.Monotonic shear mechanical characteristics and affecting factors of interface layers between frozen soil and structure[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2015, 31(9): 57-62. (in Chinese)) [24] WANG T L, WANG H H, HU T F, et al.Experimental study on the mechanical properties of soil-structure interface under frozen conditions using an improved roughness algorithm[J]. Cold Regions Science and Technology, 2019, 158: 6-68. [25] SHI Q B, YANG P, WANG G L.Experimental research on adfreezing strengths at the interface between frozen fine sand and structures[J]. Scientia Iranica, Transaction A, Civil Engineering, 2018, 25(2): 663-674. [26] 赵联桢, 杨平, 王海波. 大型多功能冻土-结构接触面循环直剪系统研制及应用[J]. 岩土工程学报, 2013, 35(4): 707-713. (ZHAO Lian-zhen, YANG Pin, WANG Hai-bo.Development and application of large-scale multi-functional frozen soil-structure interface cycle-shearing system[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(4): 707-713. (in Chinese)) [27] 石泉彬, 杨平, 张英明. 冻土与结构接触面冻结强度研究现状与展望[J]. 冰川冻土, 2017, 39(6): 1298-1306. (SHI Quan-bin, YANG Ping, ZHANG Ying-ming.Adfreezing strength at the interface between frozen soil and structure:research status and prospect[J]. Journal of Glaciology and Geocyology, 2017, 39(6): 1298-1306. (in Chinese)) [28] 陈肖柏, 刘建坤. 土的冻结作用与地基(精)[M]. 北京: 科学出版社, 2006. (CHEN Xiao-bai, LIU Jian-kun.Frost Action of Soil and Foundation Engineering[M]. Beijing: Science Press, 2006. (in Chinese)) [29] 土工试验规程:SL 237—1999[S]. 1999. (SL 237—1999 Specification of Soil Test: SL 237—1999[S]. 1999. (in Chinese)) [30] 郑剑锋, 马巍, 赵淑萍, 等. 重塑土室内制样技术对比研究[J]. 冰川冻土, 2008, 30(3): 494-500. (ZHENG Jian-feng, MA Wei, ZHAO Shu-ping, et al.Development of the specimen-preparing technique for remolded soil samples[J]. Journal of Glaciology and Geocryology, 2008, 30(3): 494-500. (in Chinese)) [31] 普通混凝土力学性能试验方法标准:GB/T 50081—2002[S]. 2002. (Standard for Test Method of Mechanical Mechanical Properties on Ordinary Concrete:GB/T 50081—2002[S]. 2002. (in Chinese)) [32] LIU J, LÜ P, CUI Y, et al.Experimental study on direct shear behavior of frozen soil-concrete interface[J]. Cold Regions Science and Technology, 2014, 104: 1-6. [33] VOLOKHOV S S.Effect of freezing conditions on the shear strength of soils frozen together with materials[J]. Soil Mechanics and Foundation Engineering, 2003, 40(6): 233-238. [34] BAKER T H W. Strain rate effect on the compressive strength of frozen sand[J]. Engineering Geology, 1979, 13(1/2/3/4): 223-231.