• Title/Summary/Keyword: 흙막이 구조물

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An Numerical Analysis of the Preloading Effect of IPS Retaining Wall through Earth Horizontal Displacement Measuring (IPS 흙막이 가시설의 수평 변위 계측을 통한 선행하중 효과 수치해석적 분석)

  • Lee, Chiho;Lee, Jonghwi;Lee, Changki;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.5
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    • pp.25-33
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    • 2012
  • In this study, gathered measuring data at fields constructed by IPS(Innovative Prestressed Support) system controls the ground displacement and improves the constructability of earth work and structure work greatly, and compared with horizontal displacement calculated by Elasto-plastic analysis program(EXCAV/W). As the result, displacement of calculated by pre-loading data is reduced 13.2% average of general method, and measuring displacement is also reduced 26.7% average of general method. Therefore that IPS system is more safe than conventional strut method in contrast to displacement of underground wall. In addition, horizontal displacement is reduced through the pre-loading effect used by IPS system.

Earth Retaining Structure Using a Row of piles during Shallow Excavation in Soft Clay (연약점성토지반의 얕은 굴착시 줄말뚝을 이용한 흙막이공)

  • 홍원표;윤종민;송영식
    • Journal of the Korean Geotechnical Society
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    • v.16 no.1
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    • pp.191-201
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    • 2000
  • In this study, the earth retaining structure using a row of piles considering plastic flow of the ground is suggested for shallow excavation works instead of conventional anchored sheet-pile wall method in the marine clays with high groundwater level. The behavior of the earth retaining structure using a row of piles is precisely observed during excavation by inclinometer and piezometer installed in opposite to the excavation side. As a result of field measurement, it was found that the behaviors of the piles and the soil were influenced mainly by slope of excavation face, interval ratio of piles, fixity condition of pile head, and stability number, etc. The earth retaining structure using a row of piles is ascertained for workability, stability, and economical construction on the soft ground having no adjacent structures.

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BIM Based Virtual Simulations in CIP(Case in Place Pile) Method for Underground Space Excavation (3차원 정보모델을 활용한 지하공간 굴착 CIP 공법의 가상검토 -서울대학병원 지하 복합진료공간 임대형 민자사업 BIM 설계를 중심으로-)

  • Lee, Hyuk-Jin;Park, Kun-Young;Kim, Hyo-Jin;Lee, Sang-Ho
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2010.04a
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    • pp.517-520
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    • 2010
  • BIM 설계시 의무사항으로 포함되어 있는 원지형과 암층별 지층, 흙막이 공법 중 CIP(Cast in Place Pile)공법, 구조물 형상을 3차원 정보 모델로 생성하고, 모델을 통해 정확한 2D 도면의 생성, 각 공정간의 간섭검토, 암층별 토공량 및 흙막이의 수량을 산출하였다. 최종 설계안을 도출하기 위해 3차원 기법이 설계 초기에 도입되어 반복적인 노력과 시간을 최소화하여 많은 설계대안을 제시하도록 하였으며, 정확한 설계결과를 얻기 위해, 2D 설계와 3D 설계를 병행 수행함과 동시에 이 과정과 결과를 비교하여 3차원 모델의 효과를 검증하였다.

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A Study on Prediction of Earth Retaining Work Cost in the Project Planning Stage -Focusing on Apartment Construction Projects in Seoul- (사업기획단계에서 흙막이 공사비 예측에 관한 연구 -서울시내 아파트 건설사업을 중심으로-)

  • Lee, Jin-Kyu;Yang, Kyung-Jin;Park, Ki-Hyeon;Kim, Chan-kee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.385-392
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    • 2021
  • In general, earth retaining work in construction works enables the construction of structures, prevents the displacement of the surrounding ground to the maximum extent, and plays an important role in ensuring the safety of the surrounding structures and field workers. The earth retaining work and the construction method differ according to the various ground characteristics, surrounding topographical characteristics, repair environment, and design conditions. In particular, in the case of Seoul city, the environments and ground conditions differ according to the area. This study analyzed the earth retaining work cost mainly for the apartment construction project in Seoul and calculated the approximate earth retaining work cost at the project planning stage. A model was developed to predict the cost of earth retaining work that matches the characteristics of Seoul City and predict the construction cost for earth retaining work. This paper presents the predicted earth retaining work cost using a multiple regression model that applies 10 project outlines as independent variables. The error rate of the prediction result of the earth retaining work cost of the apartment construction project in Seoul using multiple regression models was 10.75%.

A Study on the Technological Improvement of Strut as a Permanent Structure (구조물 겸용 흙막이 스트러트 공법의 개선 연구)

  • Kim, Sun-Kuk;Hong, Won-Kee
    • Korean Journal of Construction Engineering and Management
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    • v.9 no.5
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    • pp.186-193
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    • 2008
  • The SPS, Strut as a Permanent System, method is widely adopted for the main structural member in addition to temporary strut function for the shuttering of excavation work. Although the SPS method has contributed to cost saving, time reduction, enhancement of structural stability, improvement of construction environment and so on at the building construction site, it caused the problems of increase of basement height and additional work for fire protection of steel structure. The increase of basement height caused the increase of shuttering depth and excavation, and the fire protection caused the additional cost as well as the deterioration of construction environment. In order to improve the problems, this paper is to propose a modularized hybrid structural system(HSD). The detail of the system is introduced and the structural performance and constructibility are proved through the experiment and site application.

An Experimental Study on the Stability of Inclined Earth Retaining (지주식 흙막이의 안정성에 관한 실험적 연구)

  • Seo, Min-Su;Im, Jong-Chul;Jeong, Dong-Uk;Yoo, Jae-Won;Koo, Young-Mo;Kim, Gwang-Ho
    • Journal of the Korean Geotechnical Society
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    • v.28 no.12
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    • pp.99-110
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    • 2012
  • Inclined Earth Retaining Structure Method (IER method, briefly) is developed in order to improve the existing earth retaining method. In IER method, there are three main structures, front support, back support, and head binding. Especially, back support acts the role that reduces the earth pressure acting on the front support. In this study, the stability according to the installation angle and stiffness of front or back support is analysed by model tests. By the test results, it is known that inclined back support is very effective to reduce the earth pressure acting on the front support. Especially, the effect of the stiffness and installation angle of back support is analysed.

Proposal of Mobilized Passive Earth Pressure to Allowable Wall Displacement and Movement Types in Sandy Soil (벽체 허용변위와 양상을 고려한 사질토지반에서 수동측토압 제안)

  • Yoon, Young-Ho;Kim, Tae-Hyung;Kim, Tae-O;Woo, Min-seok
    • Journal of the Korean Geotechnical Society
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    • v.39 no.7
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    • pp.5-15
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    • 2023
  • The evaluation of passive earth pressure plays a crucial role in the design of earth-retaining structures such as retaining walls and temporary earth-retaining walls to withstand horizontal earth pressure. In the earth pressure theory, active and passive earth pressures represent the earth pressures at the limit state, where the wall displacement reaches the maximum allowed displacement. In the design of earth-retaining structures, the passive earth pressure is considered as the resisting force. In this context, the limit displacement at which passive earth pressure occurs is significantly greater than that associated with the active earth pressure. Therefore, it is irrational to apply this displacement directly to the calculation of passive earth pressure. Instead, it is necessary to consider the mobilized passive earth pressure exerted at the allowable horizontal displacement to evaluate the structural stability. This study proposes an allowable wall displacement, denoted as 0.002 H (where H represents the excavation depth), based on a literature review that focuses on sandy soils. To calculate the mobilized passive earth pressure from the wall displacement, a semi-empirical equation is proposed. By analyzing the obtained data on mobilized passive earth pressure, a reduction factor applicable to Rankine's passive earth pressure is proposed for practical application in sandy soils under different wall movement types.