• Title/Summary/Keyword: 준설물량

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Evaluation of Optimal Dredging Section Area for Burying Submarine Cable across the Coastal Waterways (연안항로내 해저케이블 매설을 위한 적정 굴착단면의 산정)

  • Kim, Hui-Jae;Lee, Dong-Hyeon;Lee, Jung-U
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.10a
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    • pp.151-153
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    • 2013
  • 최근 해양에너지플랜트 및 도서지역을 연결시키기 위한 해저 파이프라인 및 통신, 전력 케이블 매설공사가 빈번하게 이루어지고 있다. 특히, 연안항로를 가로지르는 해저케이블 매설공사에는 준설장비를 동원하여 해저부를 굴착하고 케이블을 부설한 후 상단을 덮어 보호하는 일련의 작업과정이 행해지며 이 과정에서 해저저질의 상태, 준설심도, 조류 또는 연안류의 흐름강도, 수심, 통항선박 등 다양한 조건에 따라 단면의 굴착심도 및 폭이 결정되며, 작업의 순서 또는 방법에 따라 여굴의 정도도 변하게 된다. 본 연구에서는 우리나라 서해안 실제해역에서 연안 도서를 연결하는 전력, 통신망의 개통을 위한 해저케이블 부설과 관련한 굴착단면의 실태를 실제 현장여건과 관련해서 적정단면과 준설물량의 산정을 다루어 해저환경변화에 대처하기 위한 기초자료를 제공하고자 하였다. 이를 위하여 대상해역에서 주요설계 지침에 따른 해저부 굴착단면의 평가와 적정단면을 검토하였으며, 이 단면에 따른 준설 적정물량을 산정하여 작업공정에 활용할 수 있도록 하였다.

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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.

Optimal Input Database Construction for 3D Dredging Quantification (3차원 준설물량 산출을 위한 최적의 입력DB 구축방안)

  • Gang, ByeungJu;Hwang, Bumsik;Park, Heonwoo;Cho, Wanjei
    • Journal of the Korean GEO-environmental Society
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    • v.19 no.5
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    • pp.23-31
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    • 2018
  • The dredging project became more important with the recent construction of off shore structures and reclamation projects. Accordingly, more exact quantitative estimation of the dredged amount should be required. The sub-sea ground information can be obtained generally by the boring investigation and the dredged amount can be estimated based on the depth or the deeper bound of a ceratin layer via 3D visualization program. During the estimation process, the input DB should be constructed with 1D elevation information from boring investigation for the spatially approximated distribution of a deeper bound of each ground layer. The input DB can be varied with the application of the borings and the approximation targets. Therefore, the 3D visualized ground profile and dredged amounts are compared on the actively dredged sites, vicinity of Saemangeum area and outer port area in Gunsan with regard to the input DB construction methods. Conclusively, the input DB based on the spatially approximated depths show higher precision results and more reasonable 3D visualized ground profiles.

Strategic Approach of Dredging the Port of Busan with the Change of Global Port Logistics Circumstances: Focusing on Financial Validity (항만물류환경 변화에 따른 부산항의 증심 준설 전략 - 재무적 타당성을 중심으로 -)

  • Ha, Myung-Shin;Chang, Byoung-Ky
    • Journal of Korea Port Economic Association
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    • v.24 no.2
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    • pp.131-154
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    • 2008
  • The purpose of this paper is to verify the financial validity of dredging the port of Busan with the change of global port logistics circumstances. In order to do so, NPV, IRR, B/C ratio, DPP techniques are adopted. The whole dredging at Northern port area is supposed to be negative at the depth of 16m water. Based upon its financial validity, however, the priority is Shinsundae (option 1) followed by Shinsundae (option 1) and Gamman (option 1), Shinsundae (option 1) and Gamman (option 2), Shinsundae (option 2) and Gamman (option 2), Shinsundae (option 2) and Gamman (option 2) and ShinGamman in sequence. In addition to this, Busan New port is considered to be the positive financial validity at the dredging of 16m water depth. This is because the ultra containerships of over 8,000TEU are trying to call at the port and Hanjin shipping and Hyundai Merchant shipping companies which are now the most significant customers in Northern port are scheduled to divert it.

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An Experimental Study on Consolidation Effect of Dredged and Reclaimed Ground with PBD using Seepage Pressure (침투압을 이용한 PBD 타입 준설매립 지반의 압밀 효과에 관한 실험적 연구)

  • Lee, Moo-Chul;Park, Min-Chul;Kim, Ju-Hyun;Lee, Song
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.5
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    • pp.13-24
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    • 2012
  • In this study, the in-situ model test has been conducted and used to estimate and analyze consolidation behavior of the ground by using the miniature test that reconstructs economically geotechnical behavior of in-situ full scale structure. To analogize the relation among effective stress, void ratio and coefficient of permeability at the self-weight consolidation stage, the low stress seepage consolidation test has been conducted and the involution function of constitutive equation had been obtained from the result of the curve fitted seepage consolidation test result. As a result of the numerical analysis that had been conducted on the representative section using a constitute equation, final settlement was similar with those of self-weight consolidation of the centrifugal model test. But, it was more or less smaller. It seems that these trends are caused by the difference between estimated values.

Study on the Influencing Factor for the Decision of the Embankment Construction Method using Geotextile tube Filled with Dredged soil (준설 토목섬유 튜브를 활용한 제방 축조 공법 결정을 위한 영향 인자에 관한 연구)

  • Kim, Hyeong-Joo;Sung, Hyun-Jong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.10
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    • pp.5230-5236
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    • 2013
  • In this paper, the influencing factors for the decision of the embankment construction method utilizing geotextile tube were studied by analyzing the application and economic considerations based on the construction practices of the geotextile tube filled with dredged soil in the domestic and international. In the domestic case, cost savings of 40 to 50% is attained by applying geotextile tubes in the embankment construction and in the international case, the amount of quarry materials was reduced from 20 to 70% by replacing the core of the embankment with geotextile tube. As a result, utilization of geotextile tube filled with dredged soil should be considered in a very large construction site with a quarry-to-site delivery distance of more than 16~25km. The construction scale and delivery distance were found to be important influencing factors for the decision of the embankment construction method utilizing geotextile tube filled with dredged soil.

Developing Object Library Browser for Reclamation Based BIM (BIM 기반의 준설매립전용 Library Browser 개발)

  • Lee, Dongyun;Lee, Junho;Lee, Sangwoong;Choi, Chaseok;Gu, Bonhyo
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.3
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    • pp.57-63
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    • 2014
  • This study has been conducted to building a library intended for structures considered in the design of reclamation for design automation and developing browser for integrated management system. The library has been developed using a parametric modeling method capable of changing section shape, also classifying standard crossing and family library, has been developed according to the working environment. Classified library by the characteristics manages objects and working modeling on based BIM has been developed browser using the C# program for objects to use conveniently. By interworking between developed Browser and 3D Autocad based BIM, it is possible to use easily at design drafting, calculating quantities, developing a new library, and managing a library. The browser using effectively exclusive library to reclamation is developed in this study.

Bearing Capacity and Settlement of Reclaimed Land by Utilizing Waste Lime (폐석회를 활용한 성토매립지반의 지지력 및 침하특성에 관한 연구)

  • 신은철;오영인
    • Journal of the Korean Geotechnical Society
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    • v.15 no.4
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    • pp.175-184
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    • 1999
  • Several major land reclamation projects such as the Inchon International Airport construction, Songdo New City construction, LNG Tank and LPG storage construction are underway along the coastal line of Inchon in Korea. This study was carried out to investigate the feasible use of waste lime in the land reclamation projects. Waste lime (hydrated lime) used in this study is produced as a by-product in the manufacturing process of $Na_2CO_3$ from local chemical factory in Inchon. This study presents the characteristics of bearing capacity and settlement on the ground formed by layers of waste lime and dredged soil. From the laboratory and in-situ plate load test, the ultimate bearing capacity by in-situ test was 1.25~1.37 times higher than that of the theoretical ultimate bearing capacity. Based on the settlement analysis by Magset- II, the total settlement of layered ground steadly increased up to the ratio of waste lime depth 0.2 and therefore rapidly increased with the increase of waste lime depth. The results of the present study indicate that the ratio of waste lime depth for reclamation work is about 0.2.

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A Survey of Floating Silt-Clay Thickness using Dual Frequency Echo Sounder (이중 주파수 에코사운더를 이용한 부니층 두께 조사)

  • Ha, Hee-Sang;Park, Hyeong-Keun;Kim, Yeon-Jun;Yang, In-Tae
    • Journal of the Korean Association of Geographic Information Studies
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    • v.10 no.4
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    • pp.14-21
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    • 2007
  • In general bathymetric surveying is the method which gets depth. The water depth on chart is generally measured by a 200Khz frequency echo-sounder. In this study the thickness of the floating silt-clay was measured by a duel frequency sounder using 33Khz and 200Khz. This study shows the method of measuring the volume of the floating silt-clay in dredged basins dredged basin. After this surveying RI test was performed for verifying the existence of the silt-clay.

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Physical Characteristics of Reservoir Sediment Cores with Depth (저수지 퇴적토 코어의 깊이에 따른 물리적 특성 변화)

  • Kim, Heung-Tae;Kim, Jae-Geun;Youn, Ho-Joong
    • Journal of Wetlands Research
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    • v.12 no.3
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    • pp.57-65
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    • 2010
  • This study was conducted to present primary data on the change of the physical characteristics of reservoir sediments for understanding the sedimentation. The records of the annual summation of the precipitation of >50mm per day (AP50) were compared with changes of bulk density, organic matter, mean grain-size, and sand ratio in sediment cores sampled from three reservoirs without dredging record. Reservoir sediments, characterized by mineral soil, contained organic matters originated from the debris of terrestrial plants, and changes of organic matter were related to changes of grain-size flowing into reservoirs when sediments of fine sandy loam showed 10% of organic matter contents. Rapid changes of grain-size and sand ratio in the sediment cores were associated with the increase and decrease of precipitation, and fluctuation of water level and water flow in reservoirs might have influenced on the formation of sediments in reservoirs. Records of AP50 suggested that sediments could accumulate more than about 30 within the short period of 10 years. The accumulated sediments in a short time can reflect the effect of natural and anthropogenic events on the physical characteristics of sediments.