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  • Title/Summary/Keyword: SOIL CHARACTERISTICS

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Characteristics of Soil Concrete Using Recycled Aggregates and Red Mud according to the Addition Amount of Binder (바인더 첨가량 따른 순환골재와 레드머드를 활용한 흙콘크리트의 특성)

  • Hong, Seok-Woo;Park, Kyu-Eun;Kim-Sang Jin;Kang, Suk-Pyo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.73-74
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    • 2023
  • In this paper, the characteristics of soil concrete were examined using industrial waste red mud and construction waste circulating aggregate, and if unit cement of 250 kg/m3, it can be used as a soil packaging material by meeting the compressive strength standards for parking lots of SPS-KSCICO-001-2006:2020.

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Estimation of DAWAST Model Parameters by the Soil Physical characteristics (토양의 물리적 특성을 고려한 DAWAST 모형의 매개변수결정)

  • 박승기;문종필;김태철;안병기;김병규
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 1998.10a
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    • pp.8-13
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    • 1998
  • DAWAST model considering the meteorologic and geographic characteristics of the Korean watersheds was newly developed to simulate the daily streamflow. From the condition of soil water storage just before the storm event from DAWAST model, realtime flood can be forecasted by FLOCON model. The purpose of study is that Umax and FC of DAWAST model parameter is obtained by the soil physical characteristics.

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Dynamic Deformation Characteristics of Korean Hydraulic-Fills Soil Deposits (국내 준설매립토 지반의 동적변형특성)

  • 김동수
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 1999.04a
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    • pp.69-76
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    • 1999
  • Because of the limited land in Korea most of the projects require large-scale reclamation. The hydraulic-filled soil deposits are usually loose and susceptible to be liquified during earthquake. The dynamic deformation characteristics which expressed by shear modulus and damping ratio are important to analyze the earthquake ground motion. In this paper resonant column tests were performed on five hydraulic filled soil in Korea and the deformational characteristics at both small and medium strains were investigated. The coefficients in the Hardin equation to predict the representative maximum shear modulus and modulus reduction cure are also proposed.

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Physical Properties of Soil and Turfgrass Wear Characteristics of Soccer Fields - A Simulation of the Inchon 2002 World Cup Stadium - (축구경기장 토양의 물리적 특성과 잔디 마모특성 - 2002년 월드컵 인천경기장 모형돔을 대상으로 -)

  • 심상렬;정대영
    • Journal of the Korean Institute of Landscape Architecture
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    • v.30 no.1
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    • pp.96-104
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    • 2002
  • This study was conducted to investigate physical properties of soil and turfgrass wear characteristics within turfgrasses inside or outside the stadium A 1/1000 scale model Inchon world cup soccer d[me was constructed for this test. Turfgrasses planted inside and outside the model dome were; Kentucky bluegrass(KB), Kentucky bluegrass + perennial ryegrass mixture (KB+PR), Kentucky bluegrass + tall fescue + perennial ryegrass mixture (KB+TF+PR), Zoysia japonica 'Anyangjungzii'(ZA) and Zoysia japonica 'Zenith\`(ZZ). The rootzone was constructed by the multi-layer method (United States Golf Association method). Traffic on turfgrasses was treated with a 120kg roller. Surface soil hardness, soil penetration and water infiltration values on cool-season grasses(KB, KB+PR, KB+TF+PR) was found to be better for soccer play compared to zoysiagrasses(ZA, ZZ). No big differences in surface soil hardness, soil penetration and water infiltration values were found between inside and outside of the model dome. Wear damage on cool-season grasses caused by the traffic treatment was low compared to zoysiagrasses. However, there was no difference in wear damage by the traffic treatment within cool-season grasses while wear damage on ZA was higher than on ZZ within zoysiagrasses. It could be concluded that physical properties and wear characteristics on cool-season grasses were much better for soccer play than on zoysiagrasses.

The Distribution Characteristics of Heavy Metals in the Water, Sediment and Soil along the West Nakdong River (서낙동강 유역의 강물, 저토 및 토양의 중금속 분포 특성)

  • Park, Heung-Jai;Park, Jong-Kil;Park, Won-Su
    • Journal of Environmental Science International
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    • v.3 no.4
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    • pp.409-416
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    • 1994
  • This study was Performed to evaluate the contents of heavy metals in water, sediment and soil of the 7 different sampling points along the West Nakdong river, The results were as follows: the concentrations of Zn, p, Pb, Cd, Mn, Cu and As in the sediment were 197.48, 551.85, 67.01, 2.54, 491.39, 42.95 and 10.52ppm, respectively. The concentrations of Zn, p, Pb, Cd, Mn, Cu and As in the soil was 83.32, 482.89, 17.15, 1.02, 226.02, 26.15 and 7.29ppm, respectively. The concentration ratios of heavy metals In the water to the sediment were 593 - 12700 (Cd >> Cu > Zn > Mn > As > Pb) and that of the water to the soil were 152 - 5100 (Cu > Cd > Zn > Mn > As >Pb). The correlation coefficients of Cu and Pb weve high among the water, sediment and soil. Because the accumulation amounts of heavy metal in the sediment were high, the concentration of heavy metals in the sediment was higher than in soil. The correlation coefficient of heavy metals among water, sediment and soil was high (0.79 - 0.95). Key Words Distribution Characteristics, heavy metals, West Nakdong River.

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Characteristics of Soil Erosion on the Fill-slope of Forest Road by Elapsed Years after Road Construction (임도개설후 경과년수에 따른 임도 성토비탈의 토사침식 특성)

  • Woo, Bo-Myeong;Choi, Hyung-Tae;Lee, Seung-Hyun
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.3 no.1
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    • pp.1-9
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    • 2000
  • The purpose of this study was to analyze the characteristics of soil erosion on the fill-slope of forest road by elapsed years after road construction. Thirteen plots were established on the fill-slope of the newly-constructed forest road, and surveyed for two years(1997~1998). In these plots, the data about soil erosion, surface runoff, vegetation coverage, slope structural characteristics and rainfall were collected. In 1997, the major causes for soil erosion were found by the correlation coefficients with the amount of surface runoff from the fill-slope, vegetation coverage, slope length, slope degree, total rainfall and max. 1 hour rainfall. But, in 1998, the major causes for soil erosion were vegetation coverage and slope degree. Using the stepwise multiple regression method, in 1997, the amount of soil erosion from the fill-slope was complexly expressed as a exponential function of statistically significant the amount of surface runoff from the fill-slope, total rainfall, slope degree of fill-slope and vegetation coverage, but, in 1998, simply expressed as a exponential function of vegetation coverage.

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The assessment of the adsorption and movement of Pb in mixed soil with food compost using model (모델을 이용한 음식물퇴비 혼합토양에서의 Pb 흡착 및 이동성 평가)

  • Joo, You-Yoen;Kang, Seon-Hong
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.2
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    • pp.251-257
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    • 2008
  • Food compost, having a higher organic contents than soil, could be an alternative material to prevent the proliferation of heavy metals contamination in soil. In this study we used a convection-dispersion local equilibrium sorption model(CDE) and a two-site non-equilibrium sorption model to find the effects on the adsorption and transportation of Pb by mixing food compost with soil and we also tried to find the effect of velocity and concentration of the injected solution on the characteristics of Pb. We measured Pb concentrations in injection-liquid and in effluent, and then applied them to CXTFIT program. As a result of column experiments, some parameters(D, R, β, ω) used in two-site non-equilibrium adsorption model were obtained. Characteristics of Pb adsorption and transport were analyzed using the parameters(D, R, β, ω) obtained from the CXTFIT program, We could know that mixed soil with food compost showed a higher adsorption capacity from the retardation factor(R) calculated from the breakthrough curve(BTCs) of Pb. Rs of soil and mixed soil are 20.45, 37.45 respectively, indicating that the adsorption and the transportation characteristics could be accessed quantitatively by using of two-site non-equilibrium adsorption model.

A Study on the Bucket Loading Characteristics for Wheel-loader Loading Automation (휠로더 굴착 자동화를 위한 버킷 부하특성 연구)

  • Seo, Dong-Kwan;Seo, Hyun-Jae;Kang, In-Pil;Kwon, Young-Min;Lee, Sang-Hoon;Hwang, Sung-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.11
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    • pp.1332-1340
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    • 2009
  • The front end wheel loader is widely used for the loading of materials in mining and construction fields. It has repetitive digging, loading and dumping procedures. The bucket is subjected to large resistance force from the soil during scooping. We considered the soil reaction force characteristics from scooping procedure, the protection by overload and automatic scooping mode algorithm. The main topic of this paper is the analysis of the soil reaction force characteristics. The analysis of soil mechanics is carried out and the developed soil model is verified by experimental results from the simplified experimental equipment. A simplified model of the soil shape and bucket trajectory is used to determine the scooping direction based on an estimation of the resistance force applied on the bucket during the scooping motion. In the future, this model will be used for the generation of an appropriate path for the wheel loader automation.

The Shear Characteristics of Unsaturated Sandy Soils (불포화 사질토의 전단특성)

  • Lim, Seong-Yoon
    • Journal of the Korean Geotechnical Society
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    • v.23 no.10
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    • pp.57-64
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    • 2007
  • Since matric suction of unsaturated soil was related to soil and ground water contaminations, it is very important to analyze its mechanism that was represented by shear characteristics. In three phases of soil, a little air makes the condition of unsaturated soil on contract or shrinkage surface between water and air. Capillarity and suction in pore of unsaturated soil cause surface tension and surface force so it makes negative pore water pressure and increases effective stress as a result. Therefore, negative pore water pressure in partially saturated soil affects the soil structure and degree of saturation and it is important to evaluate accurately unsaturate flow and behavior. In this study, the shear strength characteristics of the seven sandy soils were investigated using consolidated drained triaxial tests with special emphasis on the effects of the negative pore pressure and the matric suction. These tests involved shearing under either a constant net confining pressure and varying matric suction or under a constant matric suction and varying net normal stress.

Spectral Reflectance Characteristics for Five Soils at Chungbuk Prefecture and Tideland Soil Using Remote Sensing Technology (원격탐사(RS) 기법을 이용한 충북지역 5개 토양과 갯벌토양의 분광반사특성)

  • Park, Jong-Hwa;Shin, Yong-Hee;Lee, Sang-Hyuk
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.6 no.1
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    • pp.34-40
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    • 2003
  • The deterioration of agricultural environment, which is characterized by dryness and desertification of land, is one of the main reasons which explain the recent decrease of land productivity. To solve these environmental problems, it is very important to make clear the mechanism between soil, water, vegetation and temperature. The main objective of this study is to provide a soil surface information, which represent a soil reflectance spectrum, by remote sensing technology. The soil reflectance of the soil was measured using a spectro-radiometer in the wavelength range from 300nm to 1100nm. The results suggest that the reflectance properties of soils are related to their mineral composition and soil moisture. Increasing soil moisture resulted in an decrease in the rate of reflectance which leads to parallel curves of soil reflectance spectra.