• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.123-128
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• 2002

In this paper, an averaged constitutive model of concrete and reinforcing bars for RC structure and path-dependent Ohsaki's model for soil are applied, and an elasto-plastic interface model having thickness is preposed for seismic analysis of underground RC subway station structure. A finite element analysis technique is developed by applying aforementioned constitutive equations and verified through seismic analysis of underground RC subway station. Then, failure mechanisms of the RC subway station structure under seismic action are numerically derived. Then, failure modes and damage levels of the station are also analytically evaluated for the cases of several designs of the underground RC station.

• 터널과지하공간
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• 제7권1호
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• pp.65-74
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• 1997

Underground structures show different behaviors depending upon the space and the mechanical characteristics of discontinuities, such as joints, beddings, faults and shear zone. Desingning the rock structeres without considering the significance of these discontinuities can lead to false conclusions. This paper includes study on the following topics; the numerical analysis of continuous rock and discontinuous rock around a tunnel, the influences on shotcrete moment and rock-bolt axial force of tunnel due to different joint orientation and stiffness.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.215-216
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• 2017

Existing studies highlights the problems about the negative-side waterproofing design of apartment complex underground structures. This study suggests the alternatives for waterproof design construction details of as a solution, and a review on the applicability of this new construction design details through a mock-up construction is provided.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.883-886
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• 2008

"지하구조물 위원회(KCI 107)"는 교량 및 각종 구조물 기초, 지하차도, 지하철 및 공동구 등 지하구조물, 지하에 설치되는 건물의 지하실 또는 지하주차장 등의 해석 및 설계에 관한 학문적, 기술적 연구를 위해 결성된 위원회이다.위원회는 첫 번째 연구과제로 "BOX형 지하구조물의 해석 및 설계표준화 연구"를 선정하고 콘크리트 구조설계기준(2003)에 따라 실무에서 수행되고 있는 해석 및 설계의 표준화를 위한 연구를 수행하여 2005년 1차 연구를 완료하였다. 이 연구는 Box형 지하구조물의 해석 및 설계에 대한 문제점 분석과 새로운 설계 및 시공기술의 반영 위한 연구를 통해, 보다 개선된 설계방안을 강구하고 이를 반영한 표준 설계 절차 및 상세 가이드를 제시하여, Box형 지하구조물을 경제적이고, 시공 및 유지관리에 유리하며, 적정한 안전율과 내하능력을 확보할 수 있도록 일관성 있게 설계되도록 하는데 목적을 두고 있다.

• Smart Structures and Systems
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• 제22권6호
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• pp.663-673
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• 2018

In this study, the effect of particle size on the cracks propagation and coalescence or cracking pattern of the edge notched disc specimens are investigated. Firstly, calibration of PFC3D was performed using Brazilian experimental test output. Then micro parameters were used to build edge notched disc specimen. The horizontal wall of the assembly is let to move downward with a standard low speed of 0.016 m/s. The numerical results show that the tensile cracks are dominant failure pattern for the modeled discs. These tensile cracks initiate from the pre-existing notch tip and propagate parallel to the loading direction then interact with the upper boundary of the modeled specimen. As the size of the balls (ball diameter) decrease the number of tensile cracks increase. The tensile fracture toughness of the samples also decreases as the particle size increases. Understanding the crack propagation and crack coalescence phenomena in brittle materials such as concretes and rocks is of paramount importance in the stability analyses for engineering structures such as rock slopes, underground structures and tunneling.

• Structural Engineering and Mechanics
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• 제71권2호
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• pp.109-118
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• 2019

This paper presents the numerical simulation of membrane structure under impact load. Firstly, the numerical simulation model is validated by comparing with the test in Hao's research. Then, the effects of the shape of the projectile, the membrane prestress and the initial impact speed, are investigated for studying the dynamic response and failure mechanism, based on the membrane displacement, projectile acceleration and kinetic energy. Finally, the results show that the initial speed and the punch shape are related with the loss of kinetic energy of projectiles. Meanwhile, the membrane prestress is an important factor that affects the energy dissipation capacity and the impact resistance of membrane structures.

• 한국지반공학회논문집
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• 제19권1호
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• pp.201-207
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• 2003

본 연구에서는 주물공정에서 발생되는 폐주물사를 가공처리한 방식사를 지하 전력구 및 전력선용 보호관로 공사의 되메움재료로 사용하는데에 따른 적합성을 분석하고자 물리적, 화학적, 열저항 특성실험을 실시하고 현재 지하 전력 구공사의 되메움재로 사용하고 있는 강모래와 비교 분석하였다. 분석결과, 방식사는 전력구 되메움재로서 물리적 기준에 적합하며, 화학적으로 유해성이 적은 것으로 판단되나, 허용전류 측면에서는 함수비 변화에 따른 열저항율의 변동폭이 커서 강모래에 비해 불리하게 나타났다. 이는 방식사가 전력선용 보호관로의 되메움재로 사용하기에는 부적합하나, 토양의 열저항과 무관한 콘크리트 Box로 차폐된 전력구에서는 되메움재로 사용할 수 있는 가능성을 보여주는 것이다. 향후, 이러한 측면에서 방식사의 활용성을 높이기 위해서는 열저항율에 대한 저감방안 등이 연구되어야 할 것이다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.595-600
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• 2007

Greater expansion and more frequent operation of the railroad transportation system anticipated due to its characteristics including low cost, safety and mass transportation. Recently, effects on the railway structures due to expansion of newly constructed road, construction of subway, city gas pipeline, communication network, electric power network and construction of other railway underground crossing in accordance with urban planning and organization has influenced safe operation of trains. Accordingly, standard for selection of construction method that will enable construction of more economical and rational subway underground crossing structures by preventing problems occurring at the time of above construction works and accidents in safe operation of trains due to construction in advance is definitively necessary. Although there are numerous construction methods that can be applied at the time of construction of railway underground crossing, there are much difficulties in selection of appropriate construction method that considers characteristics of each construction method on non-excavation type construction method, train operation plan of number of operational routes and on-site circumstances. Therefore, this research aims to present rational standard for selection of construction method for such, and standard for slowdown speed and interception of train when passing the areas of slowdown in sectors under construction.

• 복합신소재구조학회 논문집
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• 제4권3호
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• pp.38-44
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• 2013

Glass fiber reinforced plastic (GRP) pipes buried underground are attractive for use in harsh environments, such as for the collection and transmission of liquids which are abrasive and/or corrosive. In this paper, we present the result of investigation pertaining to the structural behavior of GRP flexible pipes buried underground. In the investigation of structural behavior such as a ring deflection, experimental and analytical studies are conducted. In addition, vertical ring deflection is measured by the field test and finite element analysis (FEA) is also conducted to simulate behavior of GRP pipe buried underground. Based on the results from the finite element analyses considering soil-pipe interaction the vertical ring deflection behavior of buried GRP pipe is predicted. In addition, analytical and experimental results are compared and discussed.

• 한국군사과학기술학회지
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• 제21권3호
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• pp.279-287
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• 2018

This study investigated applicability of the fast running model for damage assessment of underground structures by ground shock. For this reason, the fast running model that consists of two main models such as the ground shock generation and propagation model and the underground structural damage assessment model was developed. The ground shock generation and propagation model was programed using theoretical formula and empirical formula introduced in TM5-855-1(US army manual). The single degree of freedom model of structural components was utilized to predict structural dynamic displacements which are used as index to assess damage level of components. In order to confirm the feasibility of the developed fast running model, underground structural dynamic displacements estimated from the fast running model were compared to displacements obtained from the finite element analysis.