• 한국지반공학회논문집
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• 제39권4호
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• pp.19-29
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• 2023

본 연구에는 지반-그라우트 인터페이스 거동을 평가하기 위한 직접전단시험 장비를 제작하였으며, 제작된 시험 장비를 통해 풍화토, 풍화토-그라우트 두 종류의 시료에 대해 직접전단시험을 수행하였다. 전단응력-슬립 곡선 평가 결과 풍화토-그라우트의 잔류 전단 강도는 단일 풍화토의 잔류 전단 강도와 유사한 값을 나타냈으며, 풍화토-그라우트 인터페이스의 한계 상태 거동은 풍화토에 의해 결정된다는 것을 확인했다. 그러나, 최대 전단 강도의 경우 풍화토-그라우트 인터페이스에서 매우 크게 증가하는 것으로 나타났다. 최대 전단 강도의 증가율은 느슨한 지반에서 더 크게 발생하는 것으로 나타났으며, 이는 풍화토 입자와 그라우트 입자가 섞여 있는 인터페이스 레이어의 두께가 증가했기 때문으로 보인다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.147-152
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• 2001

This study investigated one-dimensional vertical infiltration to an unsaturated residual soil by numerical solutions, FDM. In order to estimate the parameters needed for numerical analysis, tire soil-water characteristic curve(SWCC) of Shinnae-dong soil, one of the most typical residual soils in Korea, were experimentally obtained. Then, the statistical analysis for obtaining the SWCC was performed. The numerical solution to the linearized governing equation for unsaturated groundwater flow provides the infiltration characteristics for the unsaturated residual soil represented by transient pressure profiles and water contents profiles.

• Geomechanics and Engineering
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• 제7권6호
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• pp.633-647
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• 2014

Biopolymers, polymers produced by living organisms, are used in various fields (e.g., medical, food, cosmetic, medicine) due to their beneficial properties. Recently, biopolymers have been used for control of soil erosion, stabilization of aggregate, and to enhance drilling. However, the inter-particle behavior of such polymers on soil behavior are poorly understood. In this study, an artificial biopolymer (${\beta}$-1,3/1,6-glucan) was used as an engineered soil additive for Korean residual soil (i.e., hwangtoh). The geotechnical behavior of the Korean residual soil, after treatment with ${\beta}$-1,3/1,6-glucan, were measured through a series of laboratory approaches and then analyzed. As the biopolymer content in soil increased, so did its compactibility, Atterberg limits, plasticity index, swelling index, and shear modulus. However, the treatment had no effect on the compressional stiffness of the residual soil, and the polymer induced bio-clogging of the soil's pore spaces while resulting in a decrease in hydraulic conductivity.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 총회 및 춘계학술발표회
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• pp.143-148
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• 2005

Plastics and vinyl resin is generally used in the various fields of industry and daily life. Except incineration, most waste has been disposed finally in landfill and the leaching of plasticizer as DEHP(di 2-ethylhexyl phthalaet) has been taken place in the landfill. DEHP had been found. for endocrine disrupter by World Wild Life Fund and Japan. In this study aimed at estimation of capacity of adsorption and measurement of phthalate ester in the residual soil. The residual soil had been gathered from three closed landfill which was under stabilization with sorting and transferring. The Dibutyl phthalate and DEHP had been contained in all residual soil. Especially, resisual soil contained DEHP much more than peripheral soil. In J landfill residual soil, organic matter content, CEC and #200 sieve passing ratio is highest, and Freundlich isotherm sorption coefficient(K) and constant(1/n) is highest.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.743-750
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• 2002

Unsaturated soil has a possibility to induce a negative pore water pressure. Until now, saturated soil is mainly focused on the research of soil mechanics. Recently, soil mechanics is researched on two major parts such as saturated and unsaturated soil mechanics. Negative pore water pressure has a non-linear relationship with the water content changes. Soil-water characteristic curves of soil in Korea are not determined. There is no proper characteristic value such as air-entry value and residual water content. In this study, the characteristic curves of reclaimed soil, sand, and weathered granite soil were determined by laboratory tests. Air-entry value and residual water content were determined by fitting methods. Soil-water characteristic curves were estimated based on the particle-size distribution and compared with the laboratory test results. The results of soil-water characteristic curves estimation indicated that Fredlund and Wilson's model is excellent for sand and weathered granite soil. Arya and Paris's model is excellent for reclaimed soil.

• 한국지반공학회논문집
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• 제20권1호
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• pp.75-82
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• 2004

본 연구에서는 지지대상층이 아닌 투수 대상층으로서의 풍화토 지반에 초점을 맞추어 불교란 풍화토 시료를 이용해 다양한 구속압 조건에서 동수경사를 변화 시켜가면서 연성벽체 투수시험을 수행하였다. 동수경사 및 구속압이 풍화토의 투수특성에 미치는 영향을 투수계수를 이용하여 분석하였으며, 사질토에 대해서도 유사한 시험을 수행하여 사질토와는 구별되는 풍화토만의 침투 특성을 평가하였다. 또한 풍화토 지반의 파이핑 특성을 분석하기 위하여 모형 파이핑 시험을 수행하였다. 실험결과로부터 동수경사의 범위에 따라 풍화토는 서로 다른 투수특성을 보임을 알 수 있으며, 파이핑에 대하여 사질토에 비해 매우 높은 저항 능력을 가짐을 알 수 있었다.

• 한국토양비료학회지
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• 제43권5호
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• pp.734-740
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• 2010

Overuse of veterinary antibiotics threats public health and surrounding environment due to the occurrence of antibiotic resistant bacteria. The objective of this study was to evaluate the antibiotic's concentrations of tetracycline (TC), chlortetracycline (CTC), and oxytetracycline (OTC) in a tetracycline group (TCs), sulfamethazine (SMT), sulfamethoxazole (SMX), and sulfathiazole (STZ) in a sulfonamide group, lasalocid (LSL), monensin (MNS), and salinomycin (SLM) in a ionophore (IPs), and tylosin (TYL) in a macrolide (MLs) group from soil, water, and sediment samples adjacent to a cattle manure composting facility. For all samples of soil, water, and sediment, the highest concentrations were detected in TCs among the tested antibiotics because of its higher annual consumption in veterinary farms, Korea and its higher cohesiveness with divalent or trivalent cations in soil. Moreover, the concentrations of residual antibiotics in September were generally higher than in June because of heavier rainfall in June. We suggest that continual monitoring and developing guideline of antibiotics are needed to control residual antibiotics in the environment.

• 한국철도학회논문집
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• 제12권2호
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• pp.183-189
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• 2009

경부고속철도 2단계 구간은 콘크리트궤도 형식으로 건설되고 있다. 콘크리트궤도는 궤도의 강성 구조적 특징으로 인하여 잔류침하 규정이 엄격하게 적용되고 있다. 궤도의 잔류침하는 궤도를 지지하는 하부구조인 노반과 원지반으로부터 기인된다. 암버럭과 흙 재료로 건설되고 있는 노반의 잔류침하는 현장다짐품질에 따라 원지반을 포함한 총 잔류침하의 중요한 부분이 될 수 있다. 따라서 암버럭 토사 혼합성토재로 이루어진 노반에서의 잔류침하를 최소화하는 것은 콘크리트궤도의 성공적인 건설을 위하여 중요한 요소 중 하나이다. 본 논문에서는 암버럭-토사 혼합성토재의 거동을 이해하기 위하여 총 31회의 대형다짐시험을 수행하였다. 다짐시료는 건설 중인 2개 현장으로부터 혈암과 이암을 주성분으로 하는 노반 재료를 채취하여 조성하였고, 다짐시험은 암 종류, 4번체 통과율, 최대입경, 함수비를 변화시키면서 수행하였다. 시험결과로부터 혼합성토재의 최대건조단위중량에 영향을 미칠 수 있는 인자들에 대한 평가를 수행하였다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.213-214
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• 2005

• 한국작물학회지
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• 제23권3호
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• pp.31-46
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• 1978

In order to secure the proper use of herbicides that are frequently used in Korea, the behavior of herbicides in various type of soil were studied. This study includes the variation of phytotoxicity, leaching and movement, and residual activity period of herbicides depending upon the type of soil etc. Experiments were also conducted to establish a guideline for the selection of herbicides according to the type of soil and the proper use of each herbicide in various type of soil in Korea. Experimental results showed that the behavior of herbicides could be characterized based on the series or kind of herbicides and devided into two major groups. One group (nitrofen. CNP, benthiocarb and butachlor) of herbicides showed relatively little crop injury and was very dependable. The action of this group was not remarkably influenced by soil components, rainfall and the quantity of herbicide used with the type of soil that had small adsorption capacity such as most of soil in Korea. The other group(simazine, 2, 4-D. linuron, alachlor and simetryne) showed a wide variation in it's action and retained potentially injurious effect. This group was very susceptable to using condition as well as the type of soil itself. Based on the results of various experiments the disappearance of the residual activity period of major herbicides used in upland and paddy field and the related factors were explained. It is believed that the results of this study can be used as a base for the establishment of a guideline for the proper use of each herbicide and can suggest a direction of developing new herbicides.