Abstract：Loess is usually used as the main building materials for road subgrade. The collapsibility can be greatly eliminated after compaction of collapsible loess, and it can satisfy the requirements of whole intensity and stability of road subgrade. However, a lot of disasters such as differential settlement and collapse occur after the road subgrade of loess has been used for several years in seasonally frozen soil zone. In order to analyze the influence of various levels of moisture contents on collapsibility of loess under freeze-thaw cycles, deformation and collapsibility of collapsible loess are studied under different freeze-thaw cycles in laboratory. The test results indicate that the remolded loess at every level of moisture content still has secondary collapsibility after freeze-thaw cycles. The soil structure with higher moisture content is damaged earlier than that with lower moisture content under freeze-thaw cycles. When the dry density is certain, the larger the net amount of deformation with low soil moisture content after freeze-thaw cycles is, the smaller the collapsible coefficient is, and vice versa.
谷琪, 王家鼎, 司冬冬, 许元珺, 陈朋, 李彬. 不同含水率下黄土冻融循环对湿陷性影响探讨[J]. 岩土工程学报, 2016, 38(7): 1187-1192.
GU Qi, WANG Jia-ding, SI Dong-dong, XU Yuan-jun, CHEN-peng, LI Bin. Effect of freeze-thaw cycles on collapsibility of loess under different moisture contents. Chinese J. Geot. Eng., 2016, 38(7): 1187-1192.
[1] 高国瑞. 兰州黄土显微结构和湿陷机理的探讨[J]. 兰州大学学报, 1979(2): 123-134. (GAO Guo-rui. Study of the microstructures and collapse mechanism in loess soil from Lanzhou[J]. Journal of Lanzhou University, 1979(2): 123-134. (in Chinese)) [2] 王家鼎, 张倬元, 李保雄. 黄土自重湿陷变形的脉动液化机理[J]. 地理科学, 1999(3): 80-85. (WANG Jia-ding, ZHANG Zhuo-yuan, LI Bao-xiong. A mechanism in loess self-load collapse[J]. Scientia Geog Ra Phicasinica, 1999(3): 80-85. (in Chinese)) [3] GANDAHL R. The damaging effects of frost action in roads, overview of types of damage and preventive measures, VTI report No.230[R]. Linkoping: Swedish Road and Traffic Research Institute, 1980: 418-423. [4] EDWIN J C, ANTHONY J G. Effect of freezing and thawing on the permeability and structure of soils[J]. Engineering Geology, 1979(13): 73-92. [5] 齐吉琳, 马 巍. 冻融作用对超固结土强度的影响[J]. 岩土工程学报, 2006, 28(12): 2082-2086. (QI Ji-lin, MA Wei. Influence of freezing-thawing on strength of overconsolidated soils[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(12): 2082-2086. (in Chinese)) [6] 宋春霞, 齐吉琳, 刘奉银. 冻融作用对兰州黄土力学性质的影响[J]. 岩土力学, 2008, 29(4): 1077, 1080+1086. (SONG CHUN Xia, QI Ji-lin, LIU Feng-yin. Influence of freeze-thaw on mechanical properties of Lanzhou loess[J]. Rock and Soil Mechanics, 2008, 29(4): 1077, 1080+1086. (in Chinese)) [7] 王 泉, 马 巍, 张 泽, 等. 冻融循环对黄土二次湿陷特性的影响研究[J]. 冰川冻土, 2013, 35(2): 376-382. (WANG Quan, MA Wei, ZHANG Ze, et al. Research on the secondary collapse properties of loess under freeze-thaw cycle[J]. Journal of Glaciology and Geocryology, 2013, 35(2): 376-382. (in Chinese)) [8] GANDAHL R. The Damaging effects of frost action in roads, overview of types of damage and preventive measures, VTI report No.230[R]. Linkoping: Swedish Road and Traffic Research Institute, 1980: 418-423. [9] 高凌霞, 杨向军. 西安地区黄土湿陷性的影响因素[J]. 大连民族学院学报, 2003, 4(1): 66-69. (GAO Ling-xia, YANG Xiang-jun. Factors affecting the loess collapsibility in Xi'an[J]. Journal of Dalian Nationalities University, 2003, 4(1): 66-69. (in Chinese)) [10] 高国瑞. 黄土显微结构分类与湿陷性[J]. 中国科学, 1980, 11(12): 1203-1208, 1237-1240. (GAO Guo-rui. Loess microstructure classification and collapsibility[J]. Science China, 1980, 11(12): 1203-1208, 1237-1240. (in Chinese))
