• Title/Summary/Keyword: 매설 깊이

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Comparison of Optimization Techniques in Cost Design of Stormwater Drainage Systems (우수관망 시스템 설계에 있어서의 최적화기법의 비교)

  • Kim, Myoung-Su;Lee, Chang-Yong;Kim, Tae-Jin;Lee, Jung-Ho;Kim, Joong-Hoon
    • Journal of the Korean Society of Hazard Mitigation
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    • v.6 no.2 s.21
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    • pp.51-60
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    • 2006
  • The objective of this research is to develop a least cost system design method for branched storm sewer systems while satisfying all the design constraints using heuristic techniques such as genetic algorithm and harmony search. Two sewer system models have been developed in this study. The SEWERGA and SEWERHS both determine the optimal discrete pipe installation depths as decision variables. Two models also determine the optimal diameter of sewer pipes using the discrete installation depths of the pipes while satisfying the discharge and velocity requirement constraints at each pipe. Two models are applied to the example that was originally solved by Mays and Yen (1975) using their dynamic programming(DP). The optimal costs obtained from SEWERGA and SEWERHS are about 4% lower than that of the DP approach.

Study on the Water Penetration in Mortar by Water Pressure (수압에 따른 모르타르내 수분침투에 관한 연구)

  • Yoo, Jo-Hyeong;Lee, Han-Seung;Cho, Hyeong-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.505-508
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    • 2008
  • Concrete is a type of porous materials and is physically and chemically damaged due to exposure to various environments from the placing to the service life. These reactions affect the corrosionof steel bars applied in concrete and that decreases the durability life and strength of such steel bars. Thus, it is very important to insert rust inhibitors into steel bars in the case of a deterioration element that exceeds the critical amount of corrosion in the location of steel bars. However, it is very difficult to guarantee corrosion resistance at the location of steel bars using conventional technology that applies corrosion inhibitors only on the surface of concrete. This study attempts to develop a method that penetrates corrosion inhibitors up to the location of steel bars and investigate the penetration depth of corrosion inhibitors by verifying moisture migration in concrete under an applied pressure.

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Integrity test and depth estimation of deep foundations (깊은 기초의 건전도시험과 근입깊이 조사)

  • Jo Churl-hyun;Jung Hyun-key;Lee Tai-sup;Kim Hag-soo
    • 한국지구물리탐사학회:학술대회논문집
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    • 1999.08a
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    • pp.202-216
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    • 1999
  • The deep foundation is frequently used for the infrastructures. Since the quality control of the cast-in-place concrete foundations such as CIP piles and slurry walls is not so easy as that of the ready made PC(prestressed concrete) piles, it is necessary to get the information on the integrity of the concrete of the foundation. The depth estimation of foundations whose depths are unknown is also very important in repair and reinforcement works or in safety inspection and assessment to the big structures. The cross-hole sonic logging(CSL) system and the single channel reflection seismic measurement system were developed to test the integrity of pile. The former is well applied to CIP structures, while the later to all kinds of piles with less accurate result compared to that of CSL. To estimate the depth of the deep foundations, parallel seismics, borehole RADAR, and borehole magnetics can be used.

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Soil Moisture Measurement System in the Mountainous Hillslope located at Chunmichun Watershed (청미천 산지사면에서의 토양 수분 측정 시스템구축 연구)

  • Sun, Han-Na;Joo, Seung-Hyo;Kim, Sang-Hyun;Kwon, Kyu-Sang;Lee, Yeon-Kil;Lee, Jin-Won;Jung, Sung-won
    • Proceedings of the Korea Water Resources Association Conference
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    • 2009.05a
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    • pp.1787-1791
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    • 2009
  • 지표수의 유출과정을 설명하는 과정에서 중요인자이며, 생태수문학의 핵심변수이자 기상모형의 중요한 입력변수인 토양수분의 공간적 시간적 특징들은 강우 및 지하수와 토양수분간의 순환 구조를 규명하는데 매우 중요하다. 가장 널리 쓰이는 토양 수분 측정 장비인 TDR 장비 매설에 앞서 대상유역 선정에 대한 여러 가지 고려사항을 검토하고 수치지형 분석 등을 통한 사전분석을 실시하였다. 대상유역을 선정하기 위해서는 대상유역의 자료획득의 용이함, 지정학적, 시스템 운영적 측면에서의 가용성, 그리고 정밀측량 및 부수적요인 등 여러 요소의 고려가 요구된다. 청미천 유역을 대상으로 약 21 개의 대상후보사면을 정밀조사 하였으며, 충청북도 음성군 수레의산 청소련 수련원내의 산지 사면을 측정대상 사면으로, 지정학적 위치, 식생분포, 지질구조 및 심도 등의 토양특성의 고려를 통해서 선정하였다. 또한 대상 사면에 흐름 발생 및 분포를 계산하기 위해서 대상사면의 지표 및 기반암 표고를 정밀 측량하였으며, 기반암 또는 풍화대까지의 깊이를 실측하여 지표면 및 지하면의 수치지형 모형을 구축하였다. 대상사면 및 지하면에 대하여 표고수치지형모형(Digital Elevation Model:DEM)으로 도식한 후 흐름 발생 공간 분포를 계산하였다. 다양한 흐름 발생 알고리즘으로 기여사면적과 지형습윤지수를 계산하였다. 분배알고리즘의 의해 도출된 지형인자들로 인한 흐름발생 공간적 분포특성을 비교하여 센서의 매설 위치를 결정하였다. 센서 매설 위치에 대한 토양시료를 채취하여 토성을 분석한 결과는 미국 농무성 기준에 의한 분류로는 사양토로, 국제토양학회의 분류기준에 따르면 양토로 분류되었다. 대상사면의 유효입력강우를 확보하기위해서 개방공간인 수레의산 청소년수련원과 대상산림의 Canopy하부에 각각 강수측정 시스템을 설치하였고 약 6개월간 성공적으로 자료를 획득하였다.

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Submarine Cable Installation and Protection Methods according as Characteristics of Ocean Environment (해양환경특성에 따른 해저케이블 설치 및 보호방안)

  • Ahn, Seung-Hwan;Kim, Dong-Sun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.15 no.1
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    • pp.25-32
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    • 2009
  • The burial method has been generally used for the protection methods of submarine cable. Especially in Korea, various types of protection methods have been used according to fisheries and fishing implements. In these days, all the protection methods - burial, continuous concrete mattress, cast iron pipes, U-duct, concrete bags, rock berm, mortar bags and FCM(Flexible Concrete Mattress) are applied to the submarine cable, but these methods just focus not on the characteristics of ocean environment and the protection of environment but on the safety of submarine cable against the external damages. This research presents the protection methods of submarine cable according as the characteristics of ocean environment - external damages, depth of water, seabed condition and the protection of environment.

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GEOMETRIC NINLINEAR ANALYSIS OF UNERGROUND LAMINATED COMPISITE PIPES (기하학적 비선형을 고려한 지하매설 복합재료 파이프의 해석)

  • 김덕현;이인원;변문주
    • Computational Structural Engineering
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    • v.2 no.1
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    • pp.65-70
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    • 1989
  • An analytical study was conducted using the Galerkin technique to determine behaviour of thin fibrereinforced and laminated composite pipes under soil pressure. Geometric nonlinearity and material linearity have been assumed. It is assumed that vertical and lateral soil pressure are proportional to the depth and lateral displacement of the pipe respectively. It is also assumed that radial shear stress is negligible because the ratio of thickness to the radius of pipe is very small. The above results are verified by the finite element analysis.

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Effect of Ear and Near-side Single Circular Pit Depth and Bulk Stress on Magnetic Flux Leakage at ferromagnetic Pipeline (강자성 배관 외.내부 면의 단일 원형 홈의 깊이와 부피응력이 누설자속에 미치는 영향)

  • Ryu, Kwon-Sang;Park, Young-Tae;Atherton, D.L.;Clapham, L.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.23 no.3
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    • pp.263-269
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    • 2003
  • Magnetic flux leakage (MFL) signals were used for corrosion inspection of buried oil and gas pipeline. 3D finite element analysis was used to examine the effects of far and near-side pit depth and tensile stress on MFL signals. Anisotropci materials were used, and the effects of simulated tensile stress on MFL were investigated. The axial and radial MFL signals depended on far and near-side single pit depth and on the bulk stress, but the circumferential MFL signal did not depend on them. The axial and radial MFL signals increased with increasing pit depth and the bulk stress, but the circumferential MFL signal was scarcely changed.

A Study on the Open Cut Restoration of Underground Cavity Using Concrete Mat (콘크리트매트를 이용한 개착식 지반공동 복구방법에 관한 연구)

  • Park, Jeong-Jun;Shin, Heesoo;Chung, Yoonseok;You, Seung-Kyong;Hong, Gigwon
    • Journal of the Korean Geosynthetics Society
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    • v.18 no.1
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    • pp.55-65
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    • 2019
  • This paper describes results of experimental and numerical analyses, in order to analyze a reinforcement effect of concrete mat on open cut restoration of underground cavity. The plate loading tests were conducted to evaluate a reinforcement effect of concrete mat, at reinforcement depths from the ground surface of 10 cm, 20 cm, and 30 cm. The result showed that the reduction ratio of stress (earth pressure) was about 60% at all reinforcement depth. The reinforcement effect considering ground surface settlement and reduction ratio of stress based on laboratory tests and numerical analysis was significant, at reinforcement depths from the ground surface of 10 cm~20 cm. LFWD test results showed that subgrade modulus was the largest when concrete mat was installed 20 cm below ground surface. Therefore, it is effective to reinforce concrete mat within 20 cm from the surface, when the underground cavity due to damage of underground utilities was formed in the height direction to the bottom of the pavement layer.

Modeling of Soil Moisture Time Series using Single Input Single Output Transfer Function (전이함수를 적용한 토양 수분 시계열 자료의 분석)

  • Choi, Kyung-Moon;Sun, Han-Na;Kim, Sang-Hyun;Jung, Sung-Won
    • Proceedings of the Korea Water Resources Association Conference
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    • 2008.05a
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    • pp.1137-1141
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    • 2008
  • 본 연구에서는 경기도 설마천 지역에 위치한 독립사면에서 토양수분을 연속측정한 결과를 분석하였다. 관측망의 설계를 통하여 선정한 위치에 탐침을 매설하고 공간적인 분포를 가진 시계열 형태의 데이터를 10cm 깊이에서 수집하였다. 전이함수 모형을 사면에서의 토양수분 전이과정에 대응하고, 이를 실제 측정한 데이터에 의해서 분석한 결과와 비교해 보았다. 전이 함수 모형은 강우 데이터를 입력변수로 하고 토양수분 시계열 데이터를 반응 변수로 하여 전개하였고, 시계열 모형의 전개는 크게 자료전처리, 모형구조의 규명, 모수추정, 모형진단 등의 과정을 통해서 적합한 모형을 도출하였다. 산지 사면에서의 토양수분을 전이함수에 의하여 전개한 모형은 토양수분의 깊이별 변화와 지형적 분포 양상에 따라 특색을 나타내었다. 또한 2003년 가을과 2004년 봄의 전이함수 모형 추정을 통하여 계절별 특성이 나타남을 알 수 있는데, 봄의 토양수분의 분포는 가을의 토양수분에 비하여 큰 변동성과 고차항의 반응양상을 보인다. 본 연구는 전이함수를 이용한 토양수분의 시계열 분석이 사면에서의 토양수분 변동특성을 지형적, 계절적 특성과 연계하여 이해하고 특성화하는 과정의 적절한 도구가 될 수 있음을 보여주고 있다.

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Research on Buried Depth Dependent Characteristics of Potential Rise for Structure (구조물 전위상승의 매설깊이 의존특성에 관한 연구)

  • Gil, Hyoung-Jun;Kim, Hyang-Kon;Kim, Dong-Ook;Choi, Chung-Seog
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.2
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    • pp.104-108
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    • 2007
  • This paper deals with an approach to the reduction of potential rise according to the buried depth of structure. In order to analyze the surface potential rise of structure, an electrolytic tank which simulates the semi-infinite earth has been used. The potential rise has been measured and analyzed for types of structure using an electrolytic tank experimental apparatus in real time. The structure models were designed through reducing real buildings and fabricated with four types on a scale of one-one hundred sixty. When a test current flowed through structure models, potential gradient was the highest value in case of the outline frame type(structure model A). The distributions of surface potential rise are dependent on the resistivity and absorption percentage in concrete attached to structure model.