• Title/Summary/Keyword: dredged materials

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준설퇴적토의 현장처분시설(Confined Disposal Facility) 설계

  • 홍준식;안재환;기소정;지재성;배우근
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2002.09a
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    • pp.355-358
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    • 2002
  • A sediments are Integral called as gravel, sand, clay, mineral materials which are settling in bottom layer of reservoir, stream, and oceans from land. In practical problems relations of sediments are flood by decreed of flow capacity and down of water quality. Dredged sediments are composed with constructed material and variety of pollutant compounds. Therefore, it is very much of cost effects in nationally, if development for use of constructed material separated only constructed material within sediments. And it will be continue to the dredge operation of stream sediment for retrofit of water environment and sustainable's after the years. The following results could be obtained : In case of high concentration sediments, sample for design of CDF was shown property of flocculent settling. Assuming that average inflow rate is 1, 000㎥/hr, mean residence time( $T_{d}$), average ponding depth( $H_{pd}$ ), and design surface area for flocculent settling( $A_{df}$ ) were 5 hr, 0.6m, and 15, 750 $m^2$ respectivelyrespectivelyy

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Mathematical Model for Analysis on the Behaviours of Submerged Mound Constructed by the Dredged Materials (수중둔덕의 거동특성 해석을 위한 수학적 모형)

  • Choi, Han-kyu;Lee, Oh-Sung
    • Journal of Industrial Technology
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    • v.19
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    • pp.391-402
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    • 1999
  • The numerical model predicting the behaviours of submerged mound constructed by dredged material is developed in this paper. The model is based on the Bailard's sediment transport formula, Stokes' second-order wave theory and the sediment balance equation. Nonlinear partial differential equation which is the same form as convection-dispersion equation which represents change of bed section can be obtained by substituting sediment transport equation for equation of sediment conservation. By this process, the analytical solution by which the characteristic of the behaviours of submerged mound can be estimated is derived by probably combining the convention coefficient and the dispersion coefficient governing the behaviours of submerged mound and the probability density function representing the wave characteristics. The validity of the analytical solution is verified by comparing the analytical solution which is assumed to estimate the movement rate submerged mound by bed-load with the field data of the past and its characteristic is analyzed quantitatively by obtaining the mean of the dispersion coefficient representing the extent of the decrease rate of the submerged mound height.

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A Study on the Shallow Improvement Method for Dredged Clay Fills by the Model Tests (모형시험에 의한 준설점토지반의 표층안정기법 연구)

  • 김석열;노종구;이영철;권수영;김승욱
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.10a
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    • pp.569-576
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    • 2002
  • Recently, the hydraulic fill method is commonly used in many reclamation projects due to lack of fill materials. The method of hydraulic fill in reclamation is executed by transporting the mixture of water-soil particles into a reclaimed land through dredging pipes, then the dredged soil particles settle down in the water or flow over an out flow weir with the water. In the present study, to compare the soil and sand-mat mixed method with sand-air jet method for shallow improvement of hydraulic fills at southern seashore, the model tests were performed. Through the model test results, the behavior of surface as disturbance of desiccation crust is analyzed.

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Comparative Evaluation on Geotechnical Information 3D Visualization Program for Dredging Quantity Estimation (준설 물량 산출을 위한 지반정보 3차원 가시화 프로그램 비교 평가)

  • Lee, Boyoung;Hwang, Bumsik;Kim, Han-Saem;Cho, Wanjei
    • Journal of the Korean GEO-environmental Society
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    • v.17 no.7
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    • pp.35-42
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    • 2016
  • There are many reclamation projects domestically and internationally which requires large quantity of reclaimable materials. To provide enough reclaimable soils which are limited in land, there have been various research focusing on the dredged soils in the marine environments. As a part of this research, a GIS based 3D dredging reclamation visualization program was developed for the volume estimation of dredged soils in 2015. The developed program is based on the digitized spatial information of the site investigation data with a consideration of the reliability of the data. Prior to the validation with the comparisons with the actual dredged volume measurement data, the developed program was compared with the commercial 3D visualization program with 3D visualized results from the test site near the Gunjang harbor. The validation of the developed program was performed in terms of the degree of visualized precision, the sectional and profiling of soil layers and the dredged volume estimation results. Based on the comparisons, both commercial and developed program show similar dredged volume with minor discrepancies in soil layers.

An Experimental Study on Seepage Characteristics of Embedded Gravel and Rock Layer in the Embankment (성토층에 매설된 사력질층의 침투특성에 대한 실험적 연구)

  • Lee, Haeng-Woo;Chang, Pyoung-Wuck;Chang, Woong-Hee;Won, Jeong-Yun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.545-552
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    • 2005
  • For the purpose of studying on the seepage characteristics of embedded gravel layer in embankment, laboratory model tests were carried out. The embedded layer under embankment was $19{\sim}26mm$ diameter of gravel and those embankment materials were Saemangum dredged sand, river sand and mixed(1:1) sand with dredged and river one. Those permeability coefficients of three different sands are $5.00{\times}10^{-5}$, $3.00{\times}10^{-4}$, $7.50{\times}10^{-5}m/s$, respectively. Seepage characteristics of these results are as follows; 1) The Reynolds number of water flow through embedded gravel layer in three different permeable soils is less then 10, it is laminar flow. 2) These flow velocities through embedded gravel layer in soils are in proportion to these hydraulic gradients, it is Darcy flow. 3) These Darcian permeability coefficients of water flow through embedded gravel layer in soils show as $2.95{\times}10^{-3}$, $1.38{\times}10^{-2}$, $3.33{\times}10^{-3}$m/s, respectively, by varying permeability of embankment soils and embankment lengths. It is approximately 100 times of those permeability coefficients of embankment materials.

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A Study on Self-Weight Consolidation Characteristics in Dredged and Reclaimed Clay (준설매립 점토의 자중압밀 특성에 관한 연구)

  • Lee, Song;Yang, Tae Seon;Hwang, Koou Ho
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.4
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    • pp.953-963
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    • 1994
  • Treatment techniques of soft clay layers is needed sophisticated technology in civil engineering. Especially, dredged and reclaimed clay has high liquid limit and water content, so it is difficult to use. Now it comes to the applicability as good construction materials by predicting the behaviors. This paper is to evaluate the characteristics of sedimentation and self-weight consolidation of extremely soft clay, and is to find the way of applying model test result of reconstructing the in-situ condition to design. The consolidation properties of soft clay layers changing the size of the cell are investigated by large-scale consolidation test apparatus and the behaviors of self-weight consolidation are predicted by numerical analysis.

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Pressuremeter Test in YULCHON Combined Cycle Power Plant (율촌 복합화력발전소 공내 재하 시험)

  • Lee, Yong-Gil;Park, Kyung-Ho
    • Journal of the Korean GEO-environmental Society
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    • v.2 no.1
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    • pp.5-13
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    • 2001
  • The purpose of this paper is to present the pressuremeter test result and analysis for Yulchon Combined Cycle Power Plant(CCPP) site. The CCPP site is old backfill area with the hillcut materials obtained from the borrow sources near the mountains. The geology of this area consists of 6-layers from the ground level such as hillcut material, dredged clay fill, silty sand, original marine clay, weathered rock, soft rock, etc.. The pressuremeter test has been carried out with three different probe, in size and membrane type for all layers except the clay layers. The cone penetration test has been also carried out to collaborate with the pressuremeter test in the hillcut material layer.

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Stabilizing Capability of Oyster Shell Binder for Soft Ground Treatment (표층/심층혼합처리용 굴패각 고화재의 고화성능 평가)

  • Yoon, Gil-Lim;Kim, Byung-Tak
    • Journal of the Korean Geotechnical Society
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    • v.22 no.11
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    • pp.143-149
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    • 2006
  • An experimental study was carried out to investigate the stabilizing capability of oyster shell binder, which was developed using waste oyster shell inducing environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this paper is to compare stabilinzing capability of oyster shell binder and cement binder with treated soils. For this, a series of compressive laboratory tests were peformed to evaluate strength characteristics of treated soils by both oyster shell binder and cement binder with varing water content of dredged soils, different mixing rates of binder and curing days. Based on test results, eco-friendly binder manufactured by oyster shells showed more stabilizing capacity than cement binder and is estimated as good resource materials for soft soil improvements.

Reclamation Plan and Design for The Yeochon Industrial Complex (여천 임해공업단지 매립 계획 및 설계)

  • 한경석;신승철
    • Proceedings of the Korean Geotechical Society Conference
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    • 1992.10a
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    • pp.75-86
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    • 1992
  • The elevation of reclamation work in the coastal area for the industrial complex is determined through the investigation and review of marine conditions, drainage plan and fill materials. The embankment to be constructed with crushed stone on the soft soil should be safe against the wave force, immediate and long term consolidation settlement, overturning and sliding due to self-weight and other forces. Because of lack of fill material from the borrow pit, the soft marine clay to be dredged shall be used as the reclamation material. And Paper Drain Board is used as the improvement method for the deep soft clay strata.

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Fundamental Study on Recycling as Construction Material of Dredged Harbor Soil Mixed with Clay and Glass Frit (점토와 유리프리트를 혼합한 항만준설토의 건축자재 재활용에 관한 기초연구)

  • Im, Dong-Su;Kim, Kyung-Nam;Cho, Yeon-Bae;Park, Joon-Seok
    • Journal of the Korean Applied Science and Technology
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    • v.30 no.4
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    • pp.575-585
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    • 2013
  • This research was performed to evaluate the recycling feasibility as a construction material of dredged harbor soil mixed with clay and glass frit. Concentration of heavy metals of the dredged soil from D harbor was severly high, showing Zn of 526.0~13,150.1 mg/kg. The dredged soil was maily composed of 48.30 wt% $SiO_2$, 16.60 wt% $Al_2O_3$, 10.10 wt% CaO, 7.75 wt% $Fe_2O_3$. The clay and the glass frit contained 70.82 wt% $SiO_2$ and $Al_2O_3$ 18.78 wt%, and 71.75 wt% $SiO_2$, 13.99 wt% CaO, 8.51 wt% $Na_2O$, respectively. After adding 10~40 wt% to the clay and sintering them at $1,000^{\circ}C$ or $1,100^{\circ}C$, the compressive strength of the sintered specimens showed $132.6{\sim}178.5kgf/cm^2$ or $581.2{\sim}793.7kgf/cm^2$, respectively. In case of SC46 with the addition 40 wt% of the dredged soil to the clay, the compressive strength ($793.7kgf/cm^2$) of specimen sintered at $1,100^{\circ}C$ was over 5 times higher than that at $1,000^{\circ}C$. The specimen mixed with 40 wt% of dredged soil, 60 wt% of clay and 1 wt% of glass frit satisfied the 1st grade standard for clay brick by KS L 4201. The results of all specimens by Korean Standard Leaching Test also satisfied the standard criteria.