• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.289-290
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• 2007

• 한국지반공학회논문집
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• 제16권4호
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• pp.107-116
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• 2000

흙 필터를 대신한 토목섬유의 사용량이 점차 증가하고 있다. 따라서 흙과 결합된 복합체계에 대한 메카니즘 연구가 활발히 진행되고는 있지만 이러한 복합체의 거동은 흙과 사용 필터재의 상호작용으로 인한 여러 가지 영향 인자들 때문에 실제의 필터 설계는 경험적인 방법에 의존하고 있다. 본 연구에서는 흙/부직포 시스템에서 세립자 이동에 의한 폐색 현상을 규명하고자 하였다. 국내의 대표적인 풍화잔적토 지반에 속하는 서울의 신내동과 포이동 지역의 흘을 시료로 이용한 본 실험은 필터재 내에서의 흐름방향에 따라 수평흐름과 수직흐름으로 나누어 실내 시험을 실시하였다. 필터재로서는 현장에서 배수재로 광범위하게 쓰이는 토목섬유를 사용하였다. 흙 모체와 필터가 결합된 복합체의 적합성 여부를 필터재의 흐름에 따라 비교, 분석하고 기존에 제안된 폐색 방지 기준을 적용하여 보았다. 이러한 실험결과를 토대로 하여 수평 흐름시 발생하는 공간적 투수 계수 변화를 예측할 수 있는 모델을 제안하고 실내에서 실시한 모형실험과 이론적 모델예측의 비교를 통하여 투수능 저하 현상의 시각적, 공간적 변화 양상을 파악하였다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1999년도 추계학술발표회
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• pp.77-80
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• 1999

In this study, to evaluate the performance of leachate collection and removal system, the clogging of geotextile filter was tested and simulated for HELP. As a result of clogging test, the all permeability of geotextiles were decreased rapidly in several day. Also, $Ca^{2+}$ and CODcr concentrations were decreased during test. In model simulation for HELP, Daily discharge volume was shown insignificant change with the filter clogging. however, this result may effect on increasing of the hydraulic gradient in waste layer.r.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.1554-1561
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• 2005

Geotextiles form one of the two largest groups of geosynthetics and it is consisted two major types of synthetic material (Woven, Non-woven). The functions of geotextiles are separation, reinforcement, filtration, drainage and as a moisture barrier. Within these functions, however, there are a large number of applications or use areas. Although the many research scholar and engineer developed and established the design criteria and construction methodology of geosynthetics filter layer, because the lack of suitable design terminology and uncertainty of long term durability, sustainable research still needed for optimum design methodology to the complicate field conditions. Especially, more intensive research needed about under the cyclic flow condition and fine silty sand base material. In this paper, the filter model test performed under cyclic flow with various boundary conditions (period and frequency of cyclic flow, types of geosynthetic filter material, surcharge etc.).

• 한국지반공학회논문집
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• 제23권2호
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• pp.19-27
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• 2007

본 연구에서는 한국산업규격에서 제안하고 있는 건식방법과 습식방법을 이용하여 국내 플라스틱배수재 필터로 가장 많이 사용하는 토목섬유 3종류의 유효구멍크기를 평가하고, 시험 수행 과정에서 나타난 각 시험 방법의 특징과 시험 결과를 비교 분석하였다. 시험 결과에 의하면, 건식방법은 신속하고 간단한 시험방법이지만 상대적으로 많은 오차가 발생하는 등 좋지 않은 방법으로 나타났다. 반면에, 습식방법은 정전기 발생이나 섬유 내의 갇힘 현상 등 건식방법에서 나타나는 많은 오차를 줄일 수 있는 방법으로 판단되었다. 그러나 습식방법의 한 방법인 KS K ISO 12956의 경우, 시험에 오랜 시간이 소요되며 시험 중 사용 흙의 손실에 대한 기준이 매우 까다로운 것으로 나타났다. 일반적으로 습식방법으로 구한 토목섬유의 유효구멍크기는 건식방법으로 구한 유효구멍크기보다 작은 것으로 나타났으며, 특히 현재 사용하지 않는 방법인 수리동역학적인 방법 KS F 2126로 구한 유효구멍크기는 KS K ISO 12956방법으로 구한 유효구멍크기와 비슷하거나 작은 것으로 나타났다.

• 한국농공학회지
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• 제44권4호
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• pp.129-138
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• 2002

This paper presents a study on the discharge capacity of geotextiles as a horizontal drain layer placed between the layers of earth fill and natural soft ground. Required discharge capacity of geotextiles as drain layers estimated by consolidation analysis is proportional to the consolidation coefficient of the ground soils and the width of the earth fills. The field discharge capacity of the geotextiles are measured by the hydraulic transmissivity test. And the results show wide variation according to the material characteristics of geotextiles, water content of the soils, vertical pressure, and etc. For the short horizontal drain length, geotextile filter mat can be used for the horizontal drain layer. And f3r the long drain($25{\sim}55m$), it is used for the drain together with Bord Drain.

• 한국농공학회지
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• 제28권2호
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• pp.63-73
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• 1986

The model was developed by applying the principles of Bacot and Vidal to measure the behavior of deformation of the reinforced earth wall, and various tasts were performed by using the plastic fabric filter and the galvanized steel plate as a strip. The results obtained are as follows; 1. When the reinforced earth wall is deformed by the load, the strip is completely reinforced by the backfill materials and changed to the rigid block state, under the state of failure which permits sliding only, the next theoretical equation is formed. (H/L) . tan$\theta$ [cosO-sinOtanO] =2sinO[tan($\theta$ +0) +tanO] 2.The degree of the mutual reinforcement of the backfill material and the strip depend on the physical characteristics of the each material especially the angle of shearing resistance of the backfill material is desirable over 20$^{\circ}$ and, if it is over 400, its function could be a maximum. 3.The distribution of the maximum tensile strain of the reinforcement is changing with the height of reinforced earth wall, and when the height from bottom of the reinforced earth wall is 1.85 to 3. 35m, the maximum tensile strain appears at 2m from the skin element. The maximum tensile strain is increased by the depth of the reinforced earth wall from surface, and increased with the lapse of time after construction. 4.The failure surface of the reinforced earth wall by the concrete skin was about 60$^{\circ}$and the failure behavior of the reinforced earth wall in which the fabric filter was buried was slow, and so the pore pressure could be decreased. 5.It is possible to construct the fabric retained earth wall by the plastic fabric filter only. And the reinforcing effect between the steel plate and the plastic fabric filter is not largely different. however, in the aspect of the economic durability, the plastic fabric filter is more advantageous. 6.The reinforcing action mainly depends on the width and the length of the reinforcing materials, if possible, the full width is advantageous to enlarge the contact area with backfill. but considering the economic aspect, it is neccessary to develop the method controlling the space of the strip.

• 농업과학연구
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• 제47권3호
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• pp.485-496
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• 2020

Recent changes in the disaster environment have greatly increased the possibility of internal erosion in deteriorated reservoirs; thus, countermeasure methods are required to enhance the drainage performance of embankments. Sand filters have been mainly used to prevent internal erosion; however, due to the sand depletion and environmental problems, new alternative materials are required to replace the sand in the filter zone. In this study, crushed stone was used instead of sand as a material that could satisfy permeability, material supply, demanding conditions, and economic efficiency. Although crushed stone has excellent drainage performance, it has a clogging phenomenon due to its high permeability. Accordingly, the materials need to be separated with a geotextile wrapping method. Additionally, the 3D numerical analysis and a large model experiment were conducted to evaluate the seepage characteristics and in-site application of the crushed stone filter. As a result, the crushed stone filter showed an excellent dispersion effect by reducing the pore water pressure by about 9.5 times that of the sand filter. In addition, it was shown that the safety factor for piping increased significantly by reducing internal erosion. When comparing the economics and supply and demand conditions of the material, crushed stone was evaluated as an effective method to reduce the internal erosion of embankments at deteriorated reservoirs.

• 한국지반신소재학회논문집
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• 제4권2호
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• pp.3-9
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• 2005

최근 모래가격이 급등하고 수급이 어려워져 비교적 가격이 저렴한 코코넛껍질 압축매트와 황마필터로 구성된 수평 천연섬유배수재가 모래 대체재료로서 각광 받고 있다. 본 연구에서는 수평 천연섬유배수재의 인장강도와 투수특성을 평가하여 수평 배수재로서의 사용성을 평가하였다. 수평 천연섬유배수재의 인장특성을 분석한 결과 코코넛껍질 매트의 매우 낮은 인장강도에도 불구하고 대부분의 인장강도가 황마필터에서 발휘되므로 Christopher와 Holtz(1985)가 제안한 일반적인 토목섬유에 대한 인장강도 기준을 훨씬 상회하는 것으로 나타났다. 또한, 매우 높은 압축하중에서 수평 천연섬유배수재의 투수성을 평가한 결과 일반적인 모래의 투수계수보다 높은 투수성을 나타내는 것으로 평가되었다. 이와 같은 결과를 종합적으로 분석하면, 수평 천연섬유배수재는 기존의 모래재료를 대체할 수 있는 배수재료로 사용이 가능할 것으로 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.672-679
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• 2008

During recent years, the large soft ground improvements very rapidly increase with industrial development and it is the types and scales of structure that is enlarged by degree. Then, we must enter construct equipment to improve soft ground and we fulfilled works by carrying out soft clay soil to gain trafficability for them. For improving the soft ground, we lay geotextile on soft clay ground and fill the filter sand that can drain the pore water. Then, we landfill cover soil for come by trafficability of construction tools. Ater that we penetrate vertical drain for dehydration through soft ground. there are very complicated works. For these reason we suggest the methods of soft ground improvement constructions.