Experimental study on service performance of capillary barrier cover with unsaturated drainage layer

LI Xiao-kang; LI Xu; WU Yang; WANG Fei

doi:10.11779/CJGE2022S1034

Volume 44 Issue S1

Turn off MathJax

Article Contents

Abstract

References

Chinese Journal of Geotechnical Engineering > 2022 > 44(S1): 189-194. > DOI: 10.11779/CJGE2022S1034

LI Xiao-kang, LI Xu, WU Yang, WANG Fei. Experimental study on service performance of capillary barrier cover with unsaturated drainage layer[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S1): 189-194. DOI: 10.11779/CJGE2022S1034

Citation:

PDF (2009 KB)

Experimental study on service performance of capillary barrier cover with unsaturated drainage layer

LI Xiao-kang^1,,
LI Xu^1, ,,
WU Yang^{2, 1},
WANG Fei^{3, 1}

1.
Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
2.
China Construction America Inc., Jersey City, America
3.
Department of Higher Education Publication, China Water and Power Press, Beijing 100038, China

More Information

Received Date: September 28, 2022
Available Online: February 06, 2023

Graphical Abstract

Abstract

Abstract

The anti-seepage capability of the traditional capillary barrier cover in humid regions is immature. The capillary barrier cover with unsaturated drainage layer (UDL) represents a new direction of applying the capillary barrier cover in humid regions. Through the laboratory rainfall infiltration model tests, the anti-seepage mechanism of the capillary barrier cover with UDL is analyzed, and the effects of width and permeability coefficient of UDL on its drainage performance are studied. The test results show that: (1) The newly added unsaturated drainage layer has the suction function. By setting the drainage layer, the breakthrough time is extended from 730 min to 990 min, an increase of 35.6%. (2) When the drainage layer and the fine-grained layer are constructed by using the same materials, there are few effects on the suction performance by increasing the width ratio of the drainage layer to the fine-grained layer from 1:8 to 1:4. (3) Increasing the ratio of permeability coefficient between the drainage layer and the fine-grained layer can enhance its suction effects and achieve the ideal working state in which all the infiltration water is discharged by the drainage layer. Finally, a preliminary criterion for the ideal drainage state of UDL is proposed, and its analysis results are in good agreement with the test ones. This study may provide a new reference for the structural optimization and design of the capillary barrier cover in humid areas.
- unsaturated soil,
- capillary barrier cover,
- unsaturated drainage layer,
- laboratory test

FullText(HTML)

References (16)

References

[1]	NG C W W, NI Jun jun, LEUNG A K. Effects of plant growth and spacing on soil hydrological changes: a field study[J]. Géotechnique, 2020, 70(10): 867–881. doi: 10.1680/jgeot.18.P.207
[2]	ZHAN L T, LI G Y, JIAO W G, et al. Performance of a compacted loess/gravel cover as a capillary barrier and landfill gas emissions controller in Northwest China[J]. Science of the Total Environment, 2020, 718: 137195. doi: 10.1016/j.scitotenv.2020.137195
[3]	焦卫国, 刘振男, 季永新, 等. 红黏土覆盖层水力参数演变规律与防渗设计讨论[J]. 岩土工程学报, 2022, 44(1): 45–52. doi: 10.11779/CJGE202201003 JIAO Wei-guo, LIU Zhen-nan, JI Yong-xin, et al. Evolution laws of hydraulic parameters of red clay covers and design of seepage prevention[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(1): 45–52. (in Chinese) doi: 10.11779/CJGE202201003
[4]	APIWANTRAGOON P, BENSON C H, ALBRIGHT W H. Field hydrology of water balance covers for waste containment[J]. Journal of Geotechnical and Geo- environmental Engineering, 2015, 141(2): 04014101. doi: 10.1061/(ASCE)GT.1943-5606.0001195
[5]	张文杰, 耿潇. 垃圾填埋场毛细阻滞型腾发封顶工作机理及性能分析[J]. 岩土工程学报, 2016, 38(3): 454–459. doi: 10.11779/CJGE201603008 ZHANG Wen-jie, GENG Xiao. Performance and mechanism of capillary-barrier evaportranspiration cover of landfills[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(3): 454–459. (in Chinese) doi: 10.11779/CJGE201603008
[6]	詹良通, 贾官伟, 邓林恒, 等. 湿润气候区固废堆场封场土质覆盖层性状研究[J]. 岩土工程学报, 2012, 34(10): 1812–1818. http://cge.nhri.cn/cn/article/id/14876 ZHAN Liang-tong, JIA Guan-wei, DENG Lin-heng, et al. Performance of earthen final covers of landfills in humid areas[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(10): 1812–1818. (in Chinese) http://cge.nhri.cn/cn/article/id/14876
[7]	李晓康, 李旭, 王菲, 等. 毛细阻滞覆盖层储水能力和击穿时间试验研究[J]. 岩石力学与工程学报, 2022, 41(7): 1501–1511. doi: 10.13722/j.cnki.jrme.2021.0839 LI Xiao-kang, LI Xu, WANG Fei, et al. Experimental study on water storage capacity and breakthrough time of capillary barrier cover[J]. Chinese Journal of Rock Mechanics and Engineering, 2022, 41(7): 1501–1511. (in Chinese) doi: 10.13722/j.cnki.jrme.2021.0839
[8]	STORMONT J C, MORRIS C E. Unsaturated drainage layers for diversion of infiltrating water[J]. Journal of Irrigation and Drainage Engineering, 1997, 123(5): 364–366. doi: 10.1061/(ASCE)0733-9437(1997)123:5(364)
[9]	邓林恒, 詹良通, 陈云敏, 等. 含非饱和导排层的毛细阻滞型覆盖层性能模型试验研究[J]. 岩土工程学报, 2012, 34(1): 75–80. http://cge.nhri.cn/cn/article/id/14491 DENG Lin-heng, ZHAN Liang-tong, CHEN Yun-min, et al. Model tests on capillary-barrier cover with unsaturated drainage layer[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(1): 75–80. (in Chinese) http://cge.nhri.cn/cn/article/id/14491
[10]	焦卫国, 詹良通, 季永新, 等. 含非饱和导排层的毛细阻滞覆盖层长期性能分析[J]. 浙江大学学报(工学版), 2019, 53(6): 1101–1109. https://www.cnki.com.cn/Article/CJFDTOTAL-ZDZC201906009.htm JIAO Wei-guo, ZHAN Liang-tong, JI Yong-xin, et al. Analysis on long-term performance of capillary-barrier cover with unsaturated drainage layer[J]. Journal of Zhejiang University (Engineering Science), 2019, 53(6): 1101–1109. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZDZC201906009.htm
[11]	ZHAN T L T, LI H, JIA G W, et al. Physical and numerical study of lateral diversion by three-layer inclined capillary barrier covers under humid climatic conditions[J]. Canadian Geotechnical Journal, 2014, 51(12): 1438–1448.
[12]	NG C W W, LIU J, CHEN R, et al. Physical and numerical modeling of an inclined three-layer (silt/gravelly sand/clay) capillary barrier cover system under extreme rainfall[J]. Waste Management, 2015, 38: 210–221.
[13]	VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal, 1980, 44(5): 892–898.
[14]	刘丽, 吴羊, 李旭, 等. 压实度对宽级配土水力特性的影响研究[J]. 岩土力学, 2021, 42(9): 2545–2555. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202109023.htm LIU Li, WU Yang, LI Xu, et al. Influence of compaction on hydraulic properties of widely-graded soil[J]. Rock and Soil Mechanics, 2021, 42(9): 2545–2555. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202109023.htm
[15]	土工试验方法标准: GB/T 50123—2019[S]. 北京: 中国计划出版社, 2019. GB50132—2019 Standard for Geotechnical Testing Method: GB/T 50123—2019[S]. Beijing: China Planning Press, 2019. (in Chinese)
[16]	杨志浩, 岳祖润, 冯怀平, 等. 重载铁路基床表层级配碎石渗透特性试验研究[J]. 岩土力学, 2021, 42(1): 193–202. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202101022.htm YANG Zhi-hao, YUE Zu-run, FENG Huai-ping, et al. Experimental study of permeability properties of graded macadam in heavy haul railway subgrade bed surface layer[J]. Rock and Soil Mechanics, 2021, 42(1): 193–202. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202101022.htm

[1]	JIAO Wei-guo, ZHANG Liang-tong, JI Yong-xin, HE Ming-wei, LIU Zhen-nan. Field tests on water storage capacity of loess-gravel capillary barrier covers[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(6): 1149-1157. DOI: 10.11779/CJGE201906020
[2]	REN Lian-wei, XIAO Yang, KONG Gang-qiang, ZHANG Min-xia. Laboratory tests on soft ground improvement by chemical electro-osmosis method[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(7): 1247-1256. DOI: 10.11779/CJGE201807011
[3]	SHANG Jin-rui, YANG Jun-jie, DONG Meng-rong, SONG Wen-feng. Laboratory tests on influences of skin degradation on bearing properties of piles[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk2): 857-861.
[4]	DENG Lin-heng, ZHAN Liang-tong, CHEN Yun-min, JIA Guan-wei. Model tests on capillary-barrier cover with unsaturated drainage layer[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(1): 75-80.
[5]	GU Guo-feng, ZHAO Chun-feng, LI Shang-fei, ZHAO Cheng, XU Jian-ping. Laboratory model tests on bearing character of single pile under combined load in sand[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 379-383.
[6]	Development of a portable direct shear apparatus for both in-situ and laboratory tests[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(6).
[7]	ZHANG Zhong-miao, ZOU Jian, HE Jing-yi, WANG Hua-qiang. Laboratory tests on compaction grouting and fracture grouting of clay[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(12): 1818-1824.
[8]	DENG Yongfeng, LIU Songyu, HONG Zhenshun. Installation effect of dry-jet-mixing columns by laboratory model tests[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(1): 143-147.
[9]	ZHANG Yujun. Equivalent model and numerical analysis and laboratory test for jointed rockmasses[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(1): 29-32.
[10]	Chen Rong, Yang Shubin, Wu Xinsheng, Ge Xiurun, Feng Dingxiang. Laboratory tests on consolidated sand anchorage with prestressed bolt and analysis of anchorage mechanism[J]. Chinese Journal of Geotechnical Engineering, 2000, 22(2): 235-237.