• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2004.09a
• /
• pp.241-246
• /
• 2004

매립지 차수층에는 다짐점토층이 사용되고 있지만 건조/수축, 동결/융해 등의 환경적인 영향에 대한 내구성을 향상시키기 위한 기능성 복합차수층에 대한 연구가 진행되고 있다. 본 연구에서는 원지반토양에 고화재를 첨가한 BLT층과 벤토나이트와 미생물 배양액을 첨가한 BLM 층으로 구성된 복합차수층의 차수기능과 BLM층에서 미생물 배양액 첨가에 따른 Bio-barrier 기능을 평가하였다. 원지반토양에 고화재와 벤토나이트를 각각 8, 10%(w/w)를 첨가하였r고, 미생물 배양액은 1%(v/w)을 첨가하였다. 실험결과 원지반토양은 SC계열의 토양으로 분류되었고, BLT, BLM 차수층의 8% 혼합비율에서도 1$\times$ $10^{-7}$cm/sec 보다 낮은 투수계수를 나타내었다. BLM 층에 첨가된 미생물 배양액에 의한 Bio-barrier 기능 실험결과 미생물 배양액 첨가에 의하여 침출수에 대한 내구성이 향상된 것을 확인할 수 있었다.

• Journal of Soil and Groundwater Environment
• /
• v.7 no.1
• /
• pp.41-51
• /
• 2002

Recently, domestic waste landfills are constructed sometimes on seashore area to provide large landfill area. In order to strengthen the foundation of landfills and to prevent the infiltration of leachate through the bottom, many cases of constructing cement hardened liners on seashore clays are found. In these cases, it is possible to have cracks in the hardened liners due to settlement with waste load since the stiffness of the hardened liner Is greater than that of clay liners. In this study, the capability of Self-Sealing and Self-Healing (SSSH) liner made with a seashore clay in the metropolitan landfill to prevent the percolation of water and leachate is examined using flexible-wall permeameter test and using uniaxial compression test. Applicability of SSSH to weathered granitic soil is also examined for self-sealing capabilities. The result of Flexible permeameter test for SSSH with the seashore clay showed that permeability obtained was lower than permeability criteria of Korean waste management law. The permeability and strength characteristics of SSSH with granitic soil and bentonite showed better results than with the seashore clay.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 1997.11a
• /
• pp.35-50
• /
• 1997

쓰레기 매립장의 오수 침출 방지를 목적으로 그간 차수층이 시공되었으나 기존의 차수재는 그 성능상 많은 문제점을 내포하고 있었다. 이게 본 고에서는 '자가 형성' 및 '자가 치유'기능을 가진 SS/SH 차수층에 관하여 실내 시험 및 수도권 매립지(3공구)를 대상으로 현장 시험시공을 실시한 결과에 관해서 기술하였다. 두 시험을 통하여 SS/SH 차수층은 쓰레기 매립장 차수재로써 필요한 기준강도를 충족시키는가 하면 투수계수도 기준치를 만족시키는 낮은 수치를 나타내는 등 우수한 기능성을 충분하게 입증하였다. 무엇보다, 쓰레기 매립장에서 일반적으로 발생하는 차수층 손상에 대한 '탁월한 치유기능'을 가지고 있음으로 차수층 보수비가 전혀 필요없다는 점에서 대단히 경제적이라고 판단되었기에, 기능성과 경제성을 확보한 이 SS/SH 공법을 본공사에 적용할 수 있게 된 것이다.

• Geotechnical Engineering
• /
• v.23 no.4
• /
• pp.25-32
• /
• 2007

• Proceedings of the Korean Fiber Society Conference
• /
• 2003.04a
• /
• pp.235-238
• /
• 2003

폐기물 매립시스템은 크게 폐기물의 토양으로의 유출에 의한 오염방지를 위한 lining system과 폐기물에서 발생하는 가스의 방출차단과 빗물의 매립시스템으로의 침투방지를 위한 covering system으로 나뉘어진다. Lining system은 폐기물 하부에 차수층, 침출수 배수층, 침출수 차단층과 차수재 보호층 순으로 구성되며, covering system은 폐기물 상부에 집수관을 설치한 후 중간 복토층을 둔 후, 가스 차단층, 봉합층, 배수장치와 보호층 순으로 구성되어진다. (중략)

• Journal of Korean Society of Environmental Engineers
• /
• v.28 no.3
• /
• pp.265-269
• /
• 2006

This study was to investigate the effect of acidic leachate on the landfill liner system and healing of cracks by using industrial by-products; BFS(Blast Furnace Slag) and FA(Fly Ash). From the results of pH measurement, for OPC(Ordinary Portland Cement) and DM(Dredged Mud) mixtures immersed acidic leachate, the initial pH($4.5{\sim}5.5$) was heavily increased to approximately 10 after 60 days experiment due to the production of 2 mole $OH^-$ which was occurred by hydrolysis of CaO and MgO etc.. Meanwhile, the initial pH of acidic leachate immersed DM mixtures with BFS and FA respectively was lasted for longer period as compared to the comparison. The reason was that production of low Ca C-S-H hydrates which stabilized in acidic liquid. The physical properties(compressive strength, hydraulic conductivity) of DM mixtures added BFS and FA was improved. It was concluded that the dissolution of hydrates was disturbed by high alkalinity of BFS and FA.

• Journal of the Korean Geosynthetics Society
• /
• v.18 no.4
• /
• pp.97-106
• /
• 2019

This study was conducted to propose a reasonable requirement regulation of barrier system of rubble mound revetment offshore landfill for preventing contaminant leakage. The barrier is composed with bottom layer and side barrier. The bottom layer was assumed as impermeable clay layer and side barrier was composed with HDPE sheet (primary element) and mid-protection layer (supplementary element). Seepage-advection-dispersion numerical analysis has been conducted using SEEP/W and CTRAN/W programs under steady flow. As the results, the minimum required barrier regulations for hydraulic conductivity and thickness of the bottom layer were suggested. For side barrier, the extended length of HDPE sheet and the hydraulic conductivity of mid-protection layer were also suggested.

• Journal of Korea Soil Environment Society
• /
• v.4 no.2
• /
• pp.163-174
• /
• 1999

This paper presents a case history of remedial action adopted for contaminated groundwater in a landfill. The objectives of the projects are : (1) to effectively confine contaminated groundwater with an economically reasonable means, (2) to prevent further contamination of soil by collecting and treat the contaminant. and (3) to assure the environmental safety of the landfill during its operating period. Reported are the process from site investigation, through design and construction of an appropriate remedial action, to the monitoring of the selected confinement system. In view of the results of site investigation, deep soil mixing cutoff wall using the DMW(deep soil mixing cutoff wall) method and specially produced HEC soil stabilizer were used for the construction of deep soil mixing cutoff wall. For rock foundation with sever fractures, chemical grout curtain with urethane was installed. The monitoring results to date indicate that the selected vertical barrier performed satisfactorily.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.15 no.3
• /
• pp.90-96
• /
• 2007

Modern waste management units, so-called "landfills" protect human health and environment from hazardous leachate and gas. Accordingly, it must be constructed with a bottom liner system that includes a gas collection layer. Leachate is the contaminated liquid that drains from the waste material pollutes ground water. For this reason. bottom liner system must have durability and low hydraulic conductivity (in case of compacted clay liner, no more than $1{\times}10^{-7}cm/sec$ ). P county in Kangwon province constructed a solid waste landfill with bottom liner system. In this study. it is mainly introduced that the test results on construction and quality control of bottom liner system by "Multiple composite liner construction technology", which is selected for bottom liner system in P solid waste landfill.

• Journal of the Korean Geotechnical Society
• /
• v.33 no.11
• /
• pp.97-104
• /
• 2017

A bentonite mixing with local soil widely used as liner layer for landfill should have low permeability less than $1{\times}10^{-7}cm/s$. But there are several limitations of bentonite used as liner layer, such as drying shrinkage cracking, ineffective waterproof ability under salt water condition like flocculation under sea water. The purpose of this research is the development of a salt resistance bentonite by mixing sepiolite and guar gum to overcome the weak points of bentonite to get high water resistance capacity and permeability coefficient below $1{\times}10^{-7}cm/s$ under salt water condition. After having performed drying shrinkage cracking test, swelling index test, compaction test, and hydraulic conductivity test we confirmed the optimal mixing ratio of materials and evaluated the performance of materials.