|Table of Contents|

Water-salt migration laws of aeolian sand subgrade in desert area(PDF)


Research Field:
Publishing date:


Water-salt migration laws of aeolian sand subgrade in desert area
HU Jian-rong1 ZHANG Hong2 ZHANG Hai-long2 YAN Xiao-hui2 LI Liang2
1. Civil Engineering Design Academy Co., Ltd., Chang'an University, Xi'an 710064, Shaanxi, China; 2. Transportation Institute, Inner Mongolia University, Hohhot 010070, Inner Mongolia, China
subgrade engineering aeolian sand subgrade water content salt content model test water-salt migration
Based on aeolian sand subgrade soil in desert area, the chemical compositions of samples at different depths at the typical pavement-distressed section were tested, and the migration characteristics of salinity and moisture in subgrade were analyzed based on soil water potential principle. The soil was layered filling with the compaction degree of 95%, the moisture content and electric conductivity of soil pillar model were tested by using self-made experimental device, and the influence of temperature gradient on the water-salt migration rules in subgrade under the condition of optimum water content was analyzed. Research result shows that the subgrade soil of distressed section is fine sand, and sodium sulfate and sylvite are main salt components in both base and subgrade soil. Na2SO4·10H2O generates at low temperature -6 ℃-0 ℃ to lead to the volume expansion of soil. The salt expansion of subgrade soil and the upheaval destruction of pavement are aggravated because of the entrance of external moisture. After a week of subgrade compaction, the water content reduces by 1%-2% and the content of sulfate radical reduces by 0.05%-0.06% at depth of 5 cm, and the water content improves by 0.5%-0.8% and the content of sulfate radical reduces by 0.12%-0.14% at depth of 35 cm. Under the dual -action of gravity potential and compaction, quick and obvious water-salt stratification occurs in the uniform soil. Under the external temperature, the temperature difference at the depth of 25 cm is 20 ℃-30 ℃, but the difference is about 1 ℃ when the depth is more than 25 cm. So the temperature gradient variation gradually decreases with the increase of depth, and becomes zero eventually. The distributions of water and salt first decrease and then increase with the depth in aeolian sand subgrade, and appear hooklike rule. The water-salt migration in aeolian sand subgrade results from the mixing effect of gas-liquid states. The hydrosphere migration is primary within the depth of 10 cm from subgrade top surface under high temperature. However, because the effective access channels of capillary water can not form below 10 cm in aeolian sand composed of fine sand, the moisture mainly migrates in the form of pellicular water. The liquid water with salinity rises under the cooling effect to lead to salt accumulation effect on the top surface of subgrade. 2 tabs, 22 figs, 27 refs.


[1] CARY J W, MAYLAND H F. Salt and water movement in Unsaturated frozen soil[J]. Soil Science Society of America, 1972, 36(4): 549-555.
[2] NASSAR I N, HORTON R. Water transport in unsaturated noniso-thermal salty soil,Ⅰ: experimental results[J]. Soil Science Society of America Journal, 1989, 53(5): 1330-1337.
[3] NASSAR I N, GLOBUS A M, HORTON R. Simultaneous soil heat and water transfer[J]. Soil Science, 1992, 154(6): 465-472.
[4] PHILIP J R, DE VRIES D A.Moisture movement in porous materials under temperature gradients[J]. American Geophysical Union, 1957, 38(2): 222-232.
[5] DE VRIES D A.Simultaneous transfer of heat and moisture in porous media[J]. American Geophysical Union, 1958, 39(5): 909-916.
[6] KANG S Y, GAO W Y, XU X Z. Field observation of solute migration in freezing and thawing soils[C]∥CRC Press. Proceedings of the 7th International Symposium on Ground Freezing. Florida: CRC Press, 1994: 397-398.
[7] 赵德安,余云燕,马惠民,等.南疆铁路路基次生盐渍化试验研究[J].岩土工程学报,2014,36(4):745-751. ZHAO De-an, YU Yun-yan, MA Hui-min, et al. Secondary salinization of subgrade of Southern Xinjiang railway[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(4): 745-751.(in Chinese)
[8] 汪为巍,杨保存,王 荣.南疆盐渍土地区城区道路病害规律研究[J].岩土工程学报,2013,35(增1):253-258. WANG Wei-wei, YANG Bao-cun, WANG Rong. Road diseases in southern saline soil areas of Xinjiang[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S1): 253-258.(in Chinese)
[9] 张灵通,李寿宁,陈 再.盐渍土区新型路基模型室内试验研究[J].施工技术,2015,44(增):257-260. ZHANG Ling-tong, LI Shou-ning, CHEN Zai. Indoor experimental research on new roadbed model on halomorohic soil condition[J]. Construction Technology, 2015, 44(S): 257-260.(in Chinese)
[10] 高江平,吴家惠,杨荣尚.硫酸盐渍土盐胀特性各影响因素间交互作用规律的分析[J]. 中国公路学报, 1997,10(1):10-15. GAO Jiang-ping, WU Jia-hui, YANG Rong-shang. Analysis of the interaction laws of all influencing factors upon salt heaving properties of the sulphate salty soil[J]. China Journal of Highway and Transport, 1997, 10(1): 10-15.(in Chinese)
[11] 包卫星,杨晓华,谢永利.典型天然盐渍土多次冻融循环盐胀试验研究[J].岩土工程学报,2006,28(11):1991-1995. BAO Wei-xing, YANG Xiao-hua, XIE Yong-li. Research on salt expansion of representative crude saline soil under freezing and thawing cycles[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(11): 1991-1995.(in Chinese)
[12] 包卫星,张莎莎.路用砂类盐渍土盐胀及融陷特性试验研究[J].岩土工程学报,2016,38(4):734-739. BAO Wei-xing, ZHANG Sha-sha. Experimental study on salt expansion and thawing subsidence properties of sandy saline soil[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(4): 734-739.(in Chinese)
[13] 吴青柏,孙 涛,陶兆祥,等.恒温下含硫酸钠盐粗颗粒土盐胀特征及过程研究[J].冰川冻土,2001,23(3):238-243. WU Qing-bai, SUN Tao, TAO Zhao-xiang, et al. Experimental studies on the salt expansion of coarse grain saline soils under constant temperature[J]. Journal of Glaciology and Geocryology, 2001, 23(3): 238-243.(in Chinese)
[14] 杨晓华, 王 龙, 张莎莎.甘肃金永高速公路粗粒盐渍土试验研究[J].公路交通科技:应用技术版,2014(1):141-143. YANG Xiao-hua, WANG Long, ZHANG Sha-sha. Experimental study on coarse grain saline soil of Jinyong Freeway in Gansu Province[J]. Journal of Highway and Transportation Research and Development, 2014(1): 141-143.(in Chinese)
[15] 万旭升,赖远明.硫酸钠溶液和硫酸钠盐渍土的冻结温度及盐晶析出试验研究[J]. 岩土工程学报, 2013, 35(11): 2090-2096. WAN Xu-sheng, LAI Yuan-ming. Experimental study on freezing temperature and salt crystal precipitation of sodium sulphate soulotion and sodium sulphate saline soil[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(11): 2090-2096.(in Chinese)
[16] 张莎莎,杨晓华,戴志仁.天然粗颗粒盐渍土多次冻融循环盐胀试验[J].中国公路学报,2009,22(4):28-32. ZHANG Sha-sha, YANG Xiao-hua, DAI Zhi-ren. freezing-thawing cycles and salt expansion test of crude coarse grain clay salty soil[J]. China Journal of Highway and Transport, 2009, 22(4): 28-32.(in Chinese)
[17] 石 群,张远芳,李 炎,等.罗布泊天然盐渍土冻融循环条件下水盐迁移规律[J].工程勘察,2016(4):1-4,10. SHI Qun, ZHANG Yuan-fang, LI Yan, et al. Migration law of water and salt of Lop Nur natural saline soil in the conditions of freeze-thaw cycles[J]. Geotechnical Investigation and Surveying, 2016(4): 1-4, 10.(in Chinese)
[18] 毛爱民,田小平,吴立坚,等.自然环境下盐渍土路基水盐分布与迁移[J].公路交通技术,2013(2):5-7. MAO Ai-min, TIAN Xiao-ping, WU Li-jian, et al. Distribution and migration of water and salt in roadbeds on salty soil in nature environment[J]. Technical of Highway and Transport, 2013(2): 5-7.(in Chinese)
[19] 冯瑞玲,蔡晓宇,吴立坚,等.硫酸盐渍土水-盐-热-力四场耦合理论模型[J].中国公路学报,2017,30(2):1-10,40. FENG Rui-ling, CAI Xiao-yu, WU Li-jian, et al. Theoretical model on coupling process of moisture-salt-heat-stress field in sulfate salty soil[J]. China Journal of Highway and Transport, 2017, 30(2): 1-10, 40.(in Chinese)
[20] 张 彧,房建宏,刘建坤,等.察尔汗地区盐渍土水热状态变化特征与水盐迁移规律研究[J].岩土工程学报,2012,34(7):1344- 1348. ZHANG Yu, FANG Jian-hong, LIU Jian-kun, et al. Variation characteristics of hydrothermal state and migration laws of water and salt in Qarhan Salt Lake Region[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(7): 1344- 1348.(in Chinese)
[21] 姚占勇,滕显飞,毕玉峰,等.黄泛区粉土路基次生盐渍化临界高度研究[J].公路交通科技,2016,33(11):57-62. YAO Zhan-yong, TENG Xian-fei, BI Yu-feng, et al. Study on critical height of secondary salinization of silty soil subgrade in Yellow River Impact Plain Area[J]. Journal of Highway and Transportation Research and Development, 2016, 33(11): 57-62.(in Chinese)
[22] 尹丽丽.浅谈天然砂砾石路基施工质量控制[J].筑路机械与施工机械化,2014,31(8):62-65. YIN Li-li. Construction quality control of subgrade filled with natural sand and gravel[J]. Road Machinery and Construction Mechanization, 2014, 31(8): 62-65.(in Chinese)
[23] 王海春,井 浩.硫酸盐渍土盐胀机理及抑制措施[J].青海师范大学学报:自然科学版,2006(4):80-85. WANG Hai-chun, JING Hao. The salt heaving mechanism and restrain method of sulphate salty soil[J]. Journal of Qinghai Normal University: Natural Science Edition, 2006(4): 80-85.(in Chinese)
[24] 康海贵,郑元勋,蔡迎春,等.实测沥青路面温度场分布规律的回归分析[J].中国公路学报,2007,20(6):13-18. KANG Hai-gui, ZHENG Yuan-xun, CAI Ying-chun, et al. Regression analysis of actual measurement of temperature field distribution rules of asphalt pavement[J]. China Journal of Highway and Transport, 2007, 20(6): 13-18.(in Chinese)
[25] 陈建生,陈茜茜,王 婷.阿拉善沙漠湿沙层水分来源同位素示踪[J].水科学进展,2014,25(2):196-206. CHEN Jian-sheng, CHEN Xi-xi, WANG Ting. Isotopes tracer research of wet sand layer water sources in Alxa Desert [J]. Advances in Water Science, 2014, 25(2): 196-206.(in Chinese)
[26] 杨 伟.沙漠地区高速公路填砂路基的施工[J].筑路机械与施工机械化,2010,27(10):45-47. YANG Wei. Cinstruction of sand-filled subgrade of expressway in desert area[J]. Road Machinery and Construction Mechanization, 2010, 27(10): 45-47.(in Chinese)
[27] 阚志涛,谢立扬,徐信芯.风积沙路基干压法施工压实设备的选择研究[J].筑路机械与施工机械化,2013,30(4):49-52. KAN Zhi-tao, XIE Li-yang, XU Xin-xin. Selection of compaction equipment for aeolian-sand subgrade constructed with dry compaction[J]. Road Machinery and Construction Mechanization, 2013, 30(4): 49-52.(in Chinese)


Last Update: 2017-08-05