실내 시공시 손상시험에 의한 HDPE 지오멤브레인의 기계적 특성 및 응력균열거동 해석

박주희; 김성희; 장용채; 오태환; 류원석; 전한용; Belas Ahmed Khan; Ju Hee Park; Sung Hee Kim; Yong Chai Chang; Tae Hwan Oh; Won Seok Lyoo; Han Yong Jeon

Polymer(Korea), Vol.35, No.3, 203-209, May, 2011

Export Citation

실내 시공시 손상시험에 의한 HDPE 지오멤브레인의 기계적 특성 및 응력균열거동 해석

Analysis of Mechanical Properties and Stress Crack Behavior of HDPE Geomembranes by Laboratory Installation Damage Test

, 박주희, 김성희¹, 장용채², 오태환³, 류원석³, 전한용 ^{4, †}

인하대학교 대학원 섬유공학과
¹전남대학교 의류학과
²목포해양대학교 해양시스템공학부
³영남대학교 섬유패션학부
⁴인하대학교 나노시스템공학부

Belas Ahmed Khan, Ju Hee Park, Sung Hee Kim¹, Yong Chai Chang², Tae Hwan Oh³, Won Seok Lyoo³, and Han Yong Jeon^{4, †}

Department of Textile Engineering, Inha University Graduate School, Incheon 402-751, Korea
¹Department of Clothing and Textiles, Chonnam National University, Gwangju 500-757, Korea
²Division of Ocean System Engineering, Mokpo National Maritime University, Mokpo 530-729, Korea
³School of Textiles, Yeungnam University, Gyeongsan 712-749, Korea
⁴Division of Nano-systems Engineering, Inha University, Incheon 402-751, Korea

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초록

표면이 매끄럽고 돌기가 있는 2가지 HDPE 지오멤브레인 덤벨형 시료에 두께 10% 간격으로 10∼90% 깊이의 노치를 가하여 실험에 사용하였다. ISO 10722에 의거하여 부가하중 횟수를 변화시켜 시공시 손상의 실내 모사시험을 HDPE 지오브레인에 실시하였으며, 부가하중 횟수가 시공시 손상에 미치는 영향을 비교하였다. 항복응력과 변형률은 노치 깊이가 커짐에 따라 감소하였다. 손상된 그리고 노치를 가한 지오멤브레인을 응력균열시험에 사용하였으며, 50±1 ℃에서 pH 4와 12 용액에 침지시켜 항복응력 변화에 따른 응력균열저항성을 NCTL 시험을 통하여 고찰하였다. 인장강도의 35% 이상에서 지오멤브레인은 응력균열에 취약함을 나타냈으며, 손상을 받은 그리고 노치를 가한 지오멤브레인 모두 같은 경향을 나타내었다. 특별히 노치를 가한 지오멤브레인의 경우 각각의 응력균열 시험조건에서 시공에 의해 손상된 지오멤브레인보다 낮은 강도를 나타내었다.

Two smooth and textured surfaced HDPE geomembranes (GMs) were cut into dumbbell shape and notched where depth of the notch produced a ligament thickness of 10% to 90% of the nominal thickness with the specimen at 10% interval. A series of laboratory simulation test for installation damage were carried out at different loading cycles on HDPE GMs in accordance with ISO 10722 test method and the effect of number of loading cycle on installation damage was compared. It was found that yield stress and elongation at yield point decreased gradually as the notch depth was increased. Both installation damaged and notched, GMs were used to understand stress crack behavior and this behavior was observed through NCTL test at 50±1 ℃ at different yield stresses immerging in pH 4 and pH 12 buffer solutions. Over 35% tensile load, GMs became vulnerable to stress cracking. Both damaged and notched GMs showed the same trend. Especially, notched GMs showed less strength than installation damaged GMs at every stress cracking test condition.

Keywords:geomembranes;laboratory installation damage;loading cycles;stress crack behavior;NCTL test.

[References]

ASTM D4439, Standard Terminology for Geosynthetics, ASTM International, West Conshohocken, PA, USA (2003)
Koerner RM, Designing with Geosynthetics, 5th Ed., Prentice Hall, New Jersey, USA, pp.429-611 (2005)
Kim HK, Prediction of Long-Term behaviors of HDPE Geomembrane as Containment Barrier, Ph.D. Thesis,Chonnam National University, Gwangju, Korea (2004)
Rowe RK, Sangam HP, Geotextiles and Geomembranes., 20, 77 (2002)
Hsuan YG, Koerner RM, Lord AE, Jr, ASCE., 119, 1840 (1993)
ASTM D883, Standard Terminology Relating to Plastics, ASTM International, West Conshohocken, PA, USA (2003)
Rimal S, Ageing of HDPE Geomembranes Used To Contain Landfill Leachate or Hydrocarbon Spills, Ph.D. Thesis, Queen’s University, Kingston, Ontario, Canada (2009)
Hamid AH, Amin MB, Maadhah AG, Handbook of Polymer Degradation, pp. 434-505 (1992)
Rainey T, Barksdale R, Proceedings of Geosynthetics Conference, Vancouver, pp.729-742 (1993)
Watts GRA and Brady KC, Fifth International Conference on Geotextiles, Geomembranes and Related Products, Singapore, pp.1159-1164 (1994)
Brau G, First European Geosynthetics Conference, Maastricht, pp.145-150 (1996)
Richardson GN, Geotechnical Fabrics Report, September, Roseville, MN, USA, p.98 (1998)
ISO 10722-1, Geotextiles and geotextile related products-Procedure for simulating damage during installation- Part 1: Installation in granular materials.
ASTM D5397-07, Standard Test method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test, ASTM International, West Conshohocken, PA, USA (2007)
ASTM D6693-04, Standard Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes, ASTM International, West Conshohocken, PA, USA (2010)
ASTM D1004-08, Standard Test Method for Tear Resistance (Graves Tear) of Plastic Film and Sheeting, ASTM International, West Conshohocken, PA, USA (2003)
ASTM D4833, Test Method for Index Puncture Resistance of Geotextiles, Geomembranes and Related Products, ASTM International, West Conshohocken, PA, USA (2007)
Narejo DB, Koerner RM, Wilson-Fahmy RF, GRI Report #10 on Experimental Puncture Behavior of HDPE Geomembranes Without, Then With, Various Protection Materials, Geosynthetic Research Institute, Drexel University (1993)

[Referenced By]

[Related Articles]

[1] ASTM D4439, Standard Terminology for Geosynthetics, ASTM International, West Conshohocken, PA, USA (2003)

[2] Koerner RM, Designing with Geosynthetics, 5th Ed., Prentice Hall, New Jersey, USA, pp.429-611 (2005)

[3] Kim HK, Prediction of Long-Term behaviors of HDPE Geomembrane as Containment Barrier, Ph.D. Thesis,Chonnam National University, Gwangju, Korea (2004)

[4] Rowe RK, Sangam HP, Geotextiles and Geomembranes., 20, 77 (2002)

[5] Hsuan YG, Koerner RM, Lord AE, Jr, ASCE., 119, 1840 (1993)

[6] ASTM D883, Standard Terminology Relating to Plastics, ASTM International, West Conshohocken, PA, USA (2003)

[7] Rimal S, Ageing of HDPE Geomembranes Used To Contain Landfill Leachate or Hydrocarbon Spills, Ph.D. Thesis, Queen’s University, Kingston, Ontario, Canada (2009)

[8] Hamid AH, Amin MB, Maadhah AG, Handbook of Polymer Degradation, pp. 434-505 (1992)

[9] Rainey T, Barksdale R, Proceedings of Geosynthetics Conference, Vancouver, pp.729-742 (1993)

[10] Watts GRA and Brady KC, Fifth International Conference on Geotextiles, Geomembranes and Related Products, Singapore, pp.1159-1164 (1994)

[11] Brau G, First European Geosynthetics Conference, Maastricht, pp.145-150 (1996)

[12] Richardson GN, Geotechnical Fabrics Report, September, Roseville, MN, USA, p.98 (1998)

[13] ISO 10722-1, Geotextiles and geotextile related products-Procedure for simulating damage during installation- Part 1: Installation in granular materials.

[14] ASTM D5397-07, Standard Test method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test, ASTM International, West Conshohocken, PA, USA (2007)

[15] ASTM D6693-04, Standard Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes, ASTM International, West Conshohocken, PA, USA (2010)

[16] ASTM D1004-08, Standard Test Method for Tear Resistance (Graves Tear) of Plastic Film and Sheeting, ASTM International, West Conshohocken, PA, USA (2003)

[17] ASTM D4833, Test Method for Index Puncture Resistance of Geotextiles, Geomembranes and Related Products, ASTM International, West Conshohocken, PA, USA (2007)

[18] Narejo DB, Koerner RM, Wilson-Fahmy RF, GRI Report #10 on Experimental Puncture Behavior of HDPE Geomembranes Without, Then With, Various Protection Materials, Geosynthetic Research Institute, Drexel University (1993)