• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 봄 학술발표회 논문집
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• pp.521-528
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• 2003

In this study, a newly modified soil nailing technology called as the NDB(New Down and Board) soil nailing system is introduced. To improve the trafficability, workability, and economical efficiency, SMC(Sheet Molding Compound) board is adopted instead of using the concrete block facing. The SMC board has a distinct advantage of showing a fine view by directly coating with any kind of environmental photos. Composite material properties of the SMC board and cement grout are distinguished features of the NDB soil nailing system. In the present study, both laboratory tests(bending and punching failure tests) and field pull-out tests are carried out to analyze the behavior characteristics of the NDB soil nailing system, including the stress and strain distribution.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.96-97
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• 2015

In this search, by evaluating the field applicability of soil mixed pavement of Red mud is mixed into the soil mixed pavement field applicability, and tries to present the basic data about the site application of recycling of red mud and low carbon construction material to. As a result, the conventional soil concrete organization standards (SPS-KSCICO-001: 2003) meets the criteria for a bicycle road, making use of red mud, natural color as well as the natural loess is expressed.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1998년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Spring 1998
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• pp.335-342
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• 1998

A soil-structure interaction (SSI) experiment is being conducted in a seismically active region in Hualien, Taiwan. To obtain earthquake data for quantifying SSI effects and providing a basis to benchmark analysis methods, a 1/4-th scale cylindrical concrete containment model similar in shape to that of a nuclear power plant containment was constructed in the field where both the containment model and its surrounding soil, surface and sub-surface, are extensively instrumented to record earthquake data. In between September 1993 and May 1996, fifteen earthquakes with Richter magnitudes ranging from 4.2 to 6.2 were recorded. The recorded data were analyzed to provide information on the response characteristics of the Hualien soil-structure system, the SSI effects and the ground motion characteristics. The ground response data were analyzed for their variations with depth, with distance from the model structure, and at the same depths along downhole arrays. Variations of soil stiffness and soil-structure system frequencies were also evaluated against maximum ground motion. In addition, the site soil properties were derived based on correlation analysis of the recorded data and then correlated with those from the geotechnical investigation data.

• 한국농공학회논문집
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• 제52권6호
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• pp.95-100
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• 2010

Researchers developed Sediment Trap Drain Channel (STDC) as a solution of the reduction of soil erosion and muddy runoff from a alpine field. The STDC is the one that can take a role of grit chamber by installing the shield made of woods in the concrete channel. The study was conducted 8 kinds of stages according to the amount of soil loss and the inflow. Evaluation factors were ss concentration, turbidity and reduced soil. The results of study showed lessness of ss concentration and turbidity from the lower spot than the upper spot. The average reduction rate of ss concentration was 74 % and the average reduction rate of turbidity was 62 %. It was turned out that the performance related soil loss and muddy runoff of the STDC is effective. The governance was needed to expect the effectiveness of the STDC.

• 한국도로학회논문집
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• 제14권2호
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• pp.45-53
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• 2012

지중구조물 주위는 다짐이 잘 되지 않아 지반이 장기 침하하므로 콘크리트 포장 하부에 공동이 발생하기 쉬우며, 이로 인해 지지력이 저하되기 쉽다. 여기에 하중이 가해지면 설계 시 기대한 것보다 큰 응력이 도입되어 포장에 파손이 발생하고 수명이 감소하게 된다. 본 논문에서는 한국도로공사 시험도로의 박스형 암거 상부 콘크리트 포장 슬래브의 파손을 조사하였다. 토피고가 다른 상행선과 하행선의 암거 위치에 발생한 슬래브의 횡방향 균열을 비교하였다. 시험도로의 횡방향 균열을 검증하기 위해 토피고가 없는 박스형 암거와 콘크리트 포장을 유한요소 방법으로 모형화하고 해석하였다. 포장의 자중을 고려하고 시험도로가 위치한 경기도 여주 지역 콘크리트 슬래브의 온도구배를 적용한 후 윤하중을 재하하였다. 각 하중조합에 대해 최대인장 응력이 발생하는 위치와 이때의 윤하중 위치를 찾아냈다. 이를 통해 최대인장응력을 감소시킬 수 있는 줄눈 위치를 찾아내고 암거 크기 별로 상부에 위치하는 슬래브의 적정 길이를 제안하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.427-434
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• 2002

In Korea, there are recently many attempts to expand a temporary soil nailing system into a permanent soil nailing system since the first construction in 1993. In the downtown area, it is important that the relaxation of the ground is minimized in the ground excavation works. Due to these problems, soil nailing systems are often used the flexible facing such as shotcrete rather than the rigid facing such as SCW, CIP, and jet grout types in Korea. The soil nailing systems with rigid facings are used greatly however it is insufficient researches for design and analysis of soil nailing systems with rigid facings. In this study, various laboratory model tests are carried out to examining the influence the rigidity of facings on the global safety of soil nailing system, failure loads, displacement behaviour, axial force acting on the nails, and distribution of earth pressure. Also, the parametric studies are carried out for the typical section of soil nailed walls according to thickness of concrete facings and internal friction angle of soil using the numerical technique as shear strength reduction technique.

• Earthquakes and Structures
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• 제24권5호
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• pp.345-352
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• 2023

This paper studied the effect of soil-structure interaction (SSI) on the seismic response and retrofit of a reinforced concrete structure with a soft-first story for different soil types. A 5-story structure built on a 30m deep homogeneous soil mass was considered as a case study structure, and steel column jacketing and steel bracing were chosen as seismic retrofit methods. Seismic responses of a fixed-base and a flexible base structure subjected to seven scaled earthquake records were obtained using the software OpenSees to investigate the effect of soil on seismic response and retrofit. The nonlinearBeamColumn elements with the fiber sections were used to simulate the nonlinear behavior of the beams and columns. Soil properties were defined based on shear wave velocity according to categorized site classes defined in ASCE-7. The finite element model of the soil was made using isoparametric four-noded quadrilateral elements and the nonlinear dynamic responses of the combined system of soil and structure were calculated in the OpenSees. The analysis results indicate that the soil-structure interaction plays an important role in the seismic performance and retrofit of a structure with a soft-first story. It was observed that column steel jacketing was effective in the retrofit of the model structure on a fixed base, whereas stronger retrofit measures such as steel bracing were needed when soil-structure interaction was considered.

• 한국환경과학회지
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• 제22권11호
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• pp.1443-1449
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• 2013

This was an experimental study to evaluate temperature reduction and evapotranspiration of extensive green roof. Three test cells with a dimension of $1.2(W){\times}1.2(D){\times}1.0(H)$ meters were built using 4-inch concrete blocks. Ten-centimeter concrete slab was installed on top of each cell. The first cell was control cell with no green roof installed. The second and third cells were covered with medium-leaf type Zoysiagrass (Zoysia japonica) above a layer of soil. Soil thickness on the second cell was 10cm and that on the third cell was 20cm. Air temperature, relative humidity and solar irradiance were measured using AWS (automatic weather system). Temperature on top surface and ceiling of the control cell and temperature on top surface, below soil and ceiling of green roof cells was measured. Evapotranspiration of the green roof cells were measured using weight changes. Compared with temperature difference on the control cell, temperature difference was greater on green roof cells. Between two green roof cells, the temperature difference was greater on the third cell with a thicker soil layer. Temperature differences below soil and on ceilings of green roof cells were found greater than those of the control cell. Between the green roof cells, there was no difference in the temperature reduction effects below soil and on ceilings based on substrate depth. In summary, green roof was found effective in temperature reduction due to evapotranspiration and shading effect.

• 한국지반신소재학회논문집
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• 제4권4호
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• pp.47-56
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• 2005

산업의 발달에 따라 효율적인 부지의 활용이 요구되면서 옹벽의 사용이 많아지게 되었다. 이러한 옹벽 중 지오그리드를 보강재로 하고 콘크리트 블록을 전면판으로 사용하는 블록식 보강토 옹벽(dry cast modular block wall, MBW)은 그 시공의 편이성과 경제성으로 인해 1980년대 초부터 꾸준히 사용이 증가하고 있는 추세이다. 그러나 이 방법은 토압이론에 기초하는 특성상 양질의 사질토를 사용하여야 한다. 이에 비하여 보강사면(reinforced soil slopes, RSS)은 $70^{\circ}$ 이하의 경사를 갖는 보강토체로서 공사에 사용되는 흙이 블록식 보강토 옹벽보다는 훨씬 광범위하다. 또한 본 공법은 양질의 사질토 구득이 어려운 점을 보완하고, 개발되는 부지의 효용성을 극대화하기 위하여 부지의 경계면에서 일정 높이의 수직으로 축조되는 블록식 보강토 옹벽을 축조하고 그 위에 보강사면을 축조하였다. 본 연구는 이러한 두 공법의 장점을 활용한 복합식 보강토체를 설계하고 시공한 결과에 대하여 설계 및 시공 시 고려하여야 할 사항에 대하여 연구하였다.

• 대한토목학회논문집
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• 제26권4C호
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• pp.239-245
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• 2006

선진국 진입의 길목에 있는 우리나라는 급경사면 축조 및 유지관리에 심혈을 기울이고 있으나, 급경사면 축조를 위해 철근콘크리트 옹벽이나 보강토 옹벽(블럭식, 판넬식) 등이 사용되어지고 있다. 이러한 구조체는 전면형태가 콘크리트 벽체로서 미관의 한계성과 친환경성이 부족한 상태이다. 본 연구는 녹화를 병행할 수 있는 식생토체를 형성하고 현장에서 발생된 불량토를 보강재(부직포) 감싸기(wrapping)방법을 적용한 $80^{\circ}$의 급경사 성토체를 현장에서 직접 축조하였으며, 보강성토체에서 발생될 수 있는 수평변위, 침하량 및 법면에서 발생된 토압 등에 대한 계측을 실시하여 분석하였다. 이러한 보강성토체의 계측 및 시간경과에 따른 법면의 식생활착 등에 대한 조사결과, 향후 녹화가 가능한 급경사 보강토 구조물에 대한 적용이 가능할 것으로 판단된다.