|Table of Contents|

Water migration rule of loess subgrade with sand interlayers(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年06期
Page:
21-29
Research Field:
道路与铁道工程
Publishing date:
2016-12-20

Info

Title:
Water migration rule of loess subgrade with sand interlayers
Author(s):
YAN Chang-gen1;  ZOU Qun2;  XU Yu3;  WAN Qi1;  SHI Yu-ling4;  MA Gang-feng5
1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. School of Civil and Architecture Engineering, Nanchang Institute of Technology, Nanchang 330099, Jiangxi, China; 3. CCCC Highway ConsultantsCo., Ltd., Beijing 100088, China; 4. School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China; 5. Department of Civil and Environmental Engineering, Old Dominion University, Norfolk 23501, Virginia, America
Keywords:
subgrade engineering;  loess subgrade;  water content;  sand interlayer;  model test;  water migration
PACS:
U416.1
DOI:
-
Abstract:
Based on the loess subgrade of Shitian Expressway and the principle of soil water potential, laying sand interlayer in the loess subgrade was proposed to reduce the development of collapsibility water immersion. In the indoor model test, the sand interlayers were lain in the middle and bottom of loess subgrade, the seepage of top water, the infiltration of slope water and the capillarity of underground water for loess subgrade were simulated, the variation laws of water content in loess subgrade, their influence on the strength and stability of loess subgrade were analyzed, and their effect of water resistance and leakage resistance for sand interlayers was proved. Test result shows that the migration of water is rapider in initial period and slower in the middle and later periods; under the effect of ground water, the water contents of subgrade with a sand interlayer at the bottom of subgrade are 24%-27% after 32 days, but the water contents reach to 60% in middle and lower parts(0.5 m below the top surface)of pure loess subgrade, and the final influence depth of water reaches 1.2 m; under the seepage of top water, the water contents of all depths of pure loess subgrade are more than 60% after 12 days, while the water contents of loess subgrade with a sand interlayer in the middle are less than 40% at 15 cm under the interlayer(0.8 m below the surface of subgrade), and the moisture content is less than 30% at 25 cm under the interlayer. Obviously, the sand interlayers lay in middle and bottom of compacted loess subgrade can cut off the capillary water and reduce water infiltration, which can decrease the inside water content and increase the whole stability and strength for loess subgrade. 2 tabs, 22 figs, 28 refs.

References:

[1] 长安大学.黄土的物理特性研究[R].西安:长安大学,2005.
Chang’an University. Study on physical properties of loess[R]. Xi’an: Chang’an University, 2005.(in Chinese)
[2] 刘巍然,高江平.压实黄土路基中水分迁移的数值模拟[J].长安大学学报:自然科学版,2006,26(4):5-7.
LIU Wei-ran, GAO Jiang-ping. Numerical modelling on water migration in loess subgrade[J]. Journal of Chang’an University: Natural Science Edition, 2006, 26(4): 5-7.(in Chinese)
[3] 张宁宁,骆亚生,沙 磊.含水率对非饱和原状黄土强度的影响[J].水土保持通报,2013,33(5):101-104.
ZHANG Ning-ning, LUO Ya-sheng, SHA Lei. Effect of water content on strength of undisturbed unsaturated loess[J]. Bulletin of Soil and Water Conservation, 2013, 33(5): 101-104.(in Chinese)
[4] 刘小平.非饱和土路基水作用机理及其迁移特性研究[D].长沙:湖南大学,2008.
LIU Xiao-ping. Study on the water-effects of unsaturated-soil roadbed and water-transfer characteristics in the roadbed[D]. Changsha: Hunan University, 2008.(in Chinese)
[5] 颜 斌.黄土路基的水分入渗规律和湿陷变形研究[D].西安:长安大学,2007.
YAN Bin. Study on the moisture infiltration law and collapse deformation of loess subgrade[D]. Xi’an: Chang’an University, 2007.(in Chinese)
[6] 熊 冰,胡小明.黄土路基湿化特性的离心模型研究[J].四川联合大学学报:工程科学版,1999,3(1):1-4.
XIONG Bing, HU Xiao-ming. Study on centrifugal model of loess subgrade wetting characteristics[J]. Journal of Sichuan Union University: Engineering Science Edition, 1999, 3(1): 1-4.(in Chinese)
[7] 管延华,庄培芝,李红超,等.浸水粉土路基竖向稳定性模型试验研究[J].土木建筑与环境工程,2013,35(3):12-17.
GUAN Yan-hua, ZHUANG Pei-zhi, LI Hong-chao, et al. Model test of vertical stability of silt subgrade after soaking[J]. Journal of Civil, Architectural and Environmental Engineering, 2013, 35(3): 12-17.(in Chinese)
[8] 王铁行,岳彩坤,鲁 洁,等.连续降雨条件下黄土路基水分场数值分析[J].西安建筑科技大学学报:自然科学版,2007,39(5): 593-597.
WANG Tie-xing, YUE Cai-kun, LU Jie, et al. Numerical analysis on moisture migration in loess subgrade under rainfall[J]. Journal of Xi’an University of Architecture and Technology: Natural Science Edition, 2007, 39(5): 593-597.(in Chinese)
[9] 周庆科,金 峰,王恩志,等.离散单元法的饱和/非饱和渗流模型及其实验验证[J].水力发电学报,2003(3):34-39.
ZHOU Qing-ke, JIN Feng, WANG En-zhi, et al. Saturated/unsaturated seepage model embedded in discontinuous element method and its experimental verification[J]. Journal of Hydroelectric Power, 2003(3): 34-39.(in Chinese)
[10] 陈 非.非饱和土体渗流-变形分析研究[D].昆明:昆明理工大学,2014.
CHEN Fei. Research on the seepage and deformation of non-saturated soil[D]. Kunming: Kunming University of Science and Technology, 2014.(in Chinese)
[11] 高 远.非饱和黄土单向冻结条件下水分迁移的试验研究及数值模拟[D].西安:西安建筑科技大学,2013.
GAO Yuan. Experimental research and numerical simulation on moisture migration of unsaturated loess under unidirectional freeze[D]. Xi’an: Xi’an University of Architecture and Technology, 2013.(in Chinese)
[12] 周 乐,刘亚坤.非饱和土体渗流参数研究[J].水利与建筑工程学报,2014,12(2):145-148.
ZHOU Le, LIU Ya-kun. Research on seepage parameters of unsaturated soil[J]. Journal of Water Resources and Architectural Engineering, 2014, 12(2): 145-148.(in Chinese)
[13] 刘海松,倪万魁,杨泓全,等.黄土路基降雨入渗现场试验[J].地球科学与环境学报,2008,30(1):60-63.
LIU Hai-song, NI Wan-kui, YANG Hong-quan, et al. Site test on infiltration of loess subgrade under rainfall circumstance[J]. Journal of Earth Sciences and Environment, 2008, 30(1): 60-63.(in Chinese)
[14] 贺芳丁,张宏博,刘顺友.降雨条件下粉土路基含水量变化规律研究[J].治淮,2011(4):26-27.
HE Fang-ding, ZHANG Hong-bo, LIU Shun-you. Research on the change law of moisture content of silt subgrade under rainfall condition[J].Zhihuai, 2011(4): 26-27.(in Chinese)
[15] 宋修广.黄河冲积平原区粉土路基吸水特性及强度衰减规律试验研究[J].岩土工程学报,2010,32(10):1594-1602.
SONG Xiu-guang. Hydrophilic characteristics and strength decay of silt roadbed in Yellow River alluvial plain[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(10): 1594-1602.(in Chinese)
[16] 柳利霞.高速公路路基水破坏原理与计算分析[D].武汉:武汉大学,2005.
LIU Li-xia. The calculation and analysis about moisture damage in roadbed of highway[D]. Wuhan: Wuhan University, 2005.(in Chinese)
[17] 李 伟.豫东黄泛区粉砂土路基毛细水作用及控制技术研究[D].郑州:河南大学,2013.
LI Wei. Study on capillary water action and control technology of silt soil foundation of the Yellow River flood field in east of Henan[D]. Zhengzhou: Henan University, 2013.(in Chinese)
[18] 王文焰,张建丰,汪志荣.黄土中砂层对入渗特性的影响[J].岩土工程学报,1995,17(5):33-41.
WANG Wen-yan, ZHANG Jian-feng, WANG Zhi-rong. Influence of sand layer in loess on infiltration characteristics[J]. Chinese Journal of Geotechnical Engineering, 1995, 17(5):33-41.(in Chinese)
[19] 杨雪茹,毕胜强.高速公路湿陷性黄土路基的压实技术[J].筑路机械与施工机械化,2011,28(7):47-49.
YANG Xue-ru, BI Sheng-qiang. Compaction technology for collapsible loess subgrade of expressway[J]. Road Machinery and Construction Mechanization, 2011, 28(7): 47-49.(in Chinese)
[20] FREDLUND D G, HASAN J U. One-dimensional consolidation theory: unsaturated soils[J]. Canadian Geotechnical Journal, 1979, 16(3): 521-531.
[21] FREDLUND D G, XING A Q, HUANG Shang-yan. Predicting the permeability function for unsaturated soils using the soil-water characteristic curve[J]. Canadian Geotechnical Journal, 1994, 31(3): 533-546.
[22] TOPP G C, MILLER E E. Hysteretic moisture characteristics and hydraulic conductivities for glass-bead media[J]. Soil Science Society of America Journal, 1966, 30(2): 156-162.
[23] 汪志荣,王文焰.砂夹层的阻水减渗机制及合理埋深[J].西安理工大学学报,2000,16(2):170-174.
WANG Zhi-rong, WANG Wen-yan. The physical mechanism and depreciation and rational burying depth of sand layer in loess[J]. Journal of Xi’an University of Technology, 2000, 16(2): 170-174.(in Chinese)
[24] 王文焰,王全九,沈 冰,等.甘肃秦王川地区双层土壤结构的入渗特性[J].土壤侵蚀与水土保持学报,1998,4(2):36-40.
WANG Wen-yan, WANG Quan-jiu, SHEN Bing, et al. Infiltration characteristics of soil with double-layer structure in Qinwangchuan Area of Gansu Province[J]. Journal of Soil Erosion and Water Conservation, 1998, 4(2): 36-40.(in Chinese)
[25] 张建丰,王文焰,杨志威,等.西北黄土窑洞减渗防塌措施的研究[J].中国农业大学学报,1997,2(增):88-91.
ZHANG Jian-feng, WANG Wen-yan, YANG Zhi-wei, et al. The soil physics method of percolation decrease to protect loess cave from collapse[J]. Journal of China Agricultural University, 1997, 2(S): 88-91.(in Chinese)
[26] 王文焰,张建丰.窑洞民居减渗防塌对策的研究[J].灾害学,1992,7(2):94-96.
WANG Wen-yan, ZHANG Jian-feng. Research on countermeasures of the permeation reduction and cave in protection of cave dwelling[J]. Journal of Catastrophology, 1992, 7(2): 94-96.(in Chinese)
[27] 杨志威.黄土窑洞构造防水技术的工程试验研究[J].灾害学,1997,12(2):77-81.
YANG Zhi-wei. Research on engineering test of loess cave waterproof technique[J]. Journal of Catastrophology, 1997, 12(2): 77-81.(in Chinese)
[28] 王文焰,张建丰,汪志荣,等.砂层在黄土中的减渗作用及其计算[J].水利学报,2005,36(6):650-655.
WANG Wen-yan, ZHANG Jian-feng, WANG Zhi-rong, et al. Infiltration reduction effect of sand layer in loess[J].Journal of Hydraulic Engineering, 2005, 36(6): 650-655.(in Chinese)

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Last Update: 2016-12-20