Experimental study on expansion deformation of non-thermal-bonding composite geomembrane under ring restraint

XUE Xia; LI Wang-lin; LI Chen; WEI Ru-chun; YU Hai-rui

doi:10.11779/CJGE202006020

Volume 42 Issue 6

Turn off MathJax

Article Contents

Abstract

References

Chinese Journal of Geotechnical Engineering > 2020 > 42(6): 1145-1150. > DOI: 10.11779/CJGE202006020

XUE Xia, LI Wang-lin, LI Chen, WEI Ru-chun, YU Hai-rui. Experimental study on expansion deformation of non-thermal-bonding composite geomembrane under ring restraint[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(6): 1145-1150. DOI: 10.11779/CJGE202006020

Citation:

PDF (767 KB)

Experimental study on expansion deformation of non-thermal-bonding composite geomembrane under ring restraint

1.
University of Jinan, Jinan 250022, China
2.
Shandong University, Qingdao 266200, China

More Information

Received Date: August 26, 2019
Available Online: December 07, 2022

Graphical Abstract

Abstract

Abstract

The non-thermal-bonding composite geomembrane separately laid by geomembrane and geotextile is adopted in the horizontal anti-seepage control schemes of Datun Reservoir on the Eastern Route of the South-to-North Water Diversion Project. The reason is that the heat-melt craft is easy to burn the composite geomembrane in the process of production and welding construction, and then to cause hidden troubles. The mechanical model for the air expansion deformation of the non-thermal-bonding composite geomembrane is simplified to the spherical bulging deformation under the ring restraint, and the experiment is accomplished. The conclusions are drawn as follows: (1) The bursting pressure of the non-thermal-bonding composite geomembrane (the thickness of geomembrane is 0.4 mm, the mass per unit area of geotextile is 250 g/m²) increases slowly with the increase of loading rate. The basic loading rate, i.e., liquid injection rate, is recommended to be 100 mL/min. (2) The unit tensile force and strain curve can be divided into four stages: linear, yield, strengthening and bursting. Its overall shape is similar to that of geotextile. The curve shape is similar to that of the geomembrane, which has greater influence during the very short linear and yield stages. In the strengthening stage, the curve shape is more like that of the geotextile and is mainly determined by the geotextile. (3) The expansion and bursting pressure is determined by both the geomembrane and the geotextile. In the initial stage of the deformation, the geomembrane bears more internal pressure. Then the geotextile gradually bears more and more internal pressure and plays a decisive role until failure. The bursting pressure is 1.51 MPa, and the bursting height is 31.5 mm. (4) The elongation at break of expansion is 25.3%, which is mainly determined by the geotextile. There are two types of failure patterns: incomplete failure and complete failure, caused respectively by the non-uniform deformation and uniform deformation of the geotextile.
- plain reservoir,
- non-thermal-bonding composite geomembrane,
- ring restraint,
- expansion deformation,
- failure

FullText(HTML)

References (14)

References

[1]	GUDINA S, BRACHMAN R W I. Geomembrane strains from wrinkle deformations[J]. Geotextiles and Geomembranes, 2010, 29(2): 181-189.
[2]	XU F, LI W, LIU Z, et al. Study of factors that influence geomembrane air expansion deformation under ring-restrained conditions[J]. Geotextiles and Geomembranes, 2017, 45(3): 178-183. doi: 10.1016/j.geotexmem.2017.01.009
[3]	孔祥峰, 李志强, 金阳. 土工膜在防渗工程中的探索与实践[J]. 治淮, 2018(8): 49-50. doi: 10.3969/j.issn.1001-9243.2018.08.029 KONG Xiang-feng, LI Zhi-qiang, JIN Yang. Exploration and practice of geomembrane in anti-seepage control engineering[J]. Harnessing the Huai River, 2018(8): 49-50. (in Chinese) doi: 10.3969/j.issn.1001-9243.2018.08.029
[4]	刘霞, 田汉功, 马国庆, 等. 大屯水库库盘铺膜关键技术试验研究[J]. 南水北调与水利科技, 2011, 9(6): 110-152. https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD201106033.htm LIU Xia, TIAN Han-gong, MA Guo-qing, et al. Key Technologies for laying membrane on datun reservoir plate[J]. South-to-North Water Diversion and Water Science & Technology, 2011, 9(6): 110-152. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD201106033.htm
[5]	袁俊平, 曹雪山, 和桂玲, 等. 平原水库防渗膜下气胀现象产生机制现场试验研究[J]. 岩土力学, 2014, 35(1): 67-73. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201401010.htm YUAN Jun-ping, CAO Xue-shan, HE Gui-ling, et al. Field test study of mechanism of bulge phenomenon under geomembrane in plain reservoir[J]. Rock and Soil Mechanics, 2014, 35(1): 67-73. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201401010.htm
[6]	CAO X S, YUAN J P, HE G L, et al. In situ test and analysis method of air bulging under geomembranes in a shallow-lined reservoir[J]. Geotextiles and Geomembranes, 2015, 43(1): 24-34. doi: 10.1016/j.geotexmem.2014.11.005
[7]	CAO X S, YUAN J P, YIN Z Z, et al. Investigation of air bulging beneath geomembranes used as a liner for the datun reservoir[J]. Environmental and Engineering Geoscience, 2016, 22(1): 53-66. doi: 10.2113/gseegeosci.22.1.53
[8]	张凯, 刘斯宏, 王柳江. 土工膜防渗平原水库膜下气场数值模拟[J]. 南水北调与水利科技, 2012, 10(5): 97-118. https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD201205024.htm ZHANG Kai, LIU Si-hong, WANG Liu-jiang, et al. Numerical simulation of air field under geo-membrane in anti-seepage plain reservoir[J]. South-to-North Water Transfers and Water Science & Technology, 2012, 10(5): 97-118. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD201205024.htm
[9]	李旺林, 李志强, 魏晓燕, 等. 土工膜缺陷渗漏引起气胀的研究[J]. 岩土工程学报, 2013, 35(6): 1161-1165. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201306026.htm LI Wang-lin, LI Zhi-qiang, WEI Xiao-yan, et al. Study on air expansion caused by leakage water resulted from geomembrane defects[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(6): 1161-1165. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201306026.htm
[10]	李旺林, 刘占磊, 孟祥涛, 等. 土工膜环向约束气胀变形试验研究[J]. 岩土工程学报, 2016, 38(6): 1147-1151. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201606023.htm LI Wang-lin, LIU Zhan-lei, MENG Xiang-tao, et al. Experimental study on air expansion deformation of geomembrane in ring- restrained conditions[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(6): 1147-1151. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201606023.htm
[11]	MERRY S M, BRAY J D. Size effects for multi-axial tension testing of HDPE and PVC geomembranes[J]. Geotech Test J, 1995, 18: 441-449.
[12]	ANDREJACK TL, WARTMAN J. Development and interpretation of a multi-axial tension test for geotextiles[J]. Geotextiles and Geomembranes, 2010, 28(6): 559-569.
[13]	Standard Test Method for Bursting Strength of Textile Fabrics—Diaphragm Bursting Strength Tester Method: D3786/D3786M—13[S]. 2013.
[14]	REUGE N, SCHMIDT F M, MAOULT Y L, et al. Elastomer biaxial characterization using bubble inflation technique. I: experimental investigations[J]. Polymer Engineering & Science, 2001, 41(3): 522-531.