• Proceedings of the Korean Geotechical Society Conference
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• 2001.03a
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• pp.121-128
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• 2001

This is a case study of stability analysis and reinforcement design for the tunnel where the collapse of the entrance slops occured along the fault zone developed in the bed rock. According to the site investigation, the main factor of sliding is the influence of fault gouge and heavy rainfall. Considering the in-situ condition, the versatile reinforcement methods is needed, and so the close investigation on the site area was accompanied with the stability analysis of tunnel and slops. The FRP(Fiberglass reinforced plastic) grouting method improved the defect of Steel Umbrella Arch Method, such as oxidation, low work efficiency, the material's heavy weight, is adapted as the reinforcement methods.

• Proceedings of the Korean Geotechical Society Conference
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• 2001.03a
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• pp.493-500
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• 2001

The construction of bored tunnels in soft ground inevitably causes ground movements. In the urban environment these may be of particular significance, because of their influence on buildings, other tunnels and services. The prediction of ground movements and the assessment of the potential effects on the structures is therefore an essential aspect of planning, design and construction of a tunnelling project in the urban environment. In this study, to minimize the effect of tunnelling-Induced ground movements on the adjacent structures, a system for tile settlement risk management was developed. The GIS based risk assessment system for adjacent structures developed in this study consists of several modules such as building information module, settlement evaluation module, potential risk assessment module for adjacent structures, and analysis module for monitoring data. This system focuses on controlling and managing construction processes that may lead to settlement In the surrounding buildings and can contribute to producing the optimum technical and economic design.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.48-57
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• 2009

The quality control of tunnel support construction is very important to maintain a long term stability of tunnel. Especially, steel fiber reinforced shotcrete should be necessary to investigate practically the condition of quality control in the construction site. In order to perform this study, the design criteria and specifications relevant to steel fiber reinforced shotcrete are reviewed. And the comparison is made between the bearing capacity of the several shotcrete layers, based on the equivalence of the bending moments. Eight tunnel construction sites are also investigated carefully to examine and analyse the characteristics of steel fiber reinforced shotcrete especially including strength and mixing condition of steel fiber. Based on the results, it is founded the items to be improved in the future. In addition, the modification program for the specifications of steel fiber reinforced shotcrete is suggested.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.961-965
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• 2009

Using much electric resistivity survey to design or preservation administration of facilities. However, By survey method that electric resistivity survey grasps special quality in base by potential difference creating artificial current in underground, Is influenced in electric resistance propensitys of various underground utilities in base. This Study selects dam 1 place that could grasp well underground situation and studied electricity interference effect by effect of underground utilities. Grasp underground utilities of dam interior, and control and observed accuracy with survey wave because various pole space. Through this Study, wish to present survey method of electric resistivity survey at design or survey of preservation administration dimension after with drawn result.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.518-525
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• 2009

The bi-directional high pressure pile load test(BDH PLT) which is a kind of pile load tests was conducted to find out a reasonable design procedure of large-diameter drilled shafts of large-size building structures. The behaviors of bearing capacity and settlement of the large-diameter drilled shafts were analyzed and the results obtained from BDH PLT were also compared with those obtained from the equations suggested in the specification. In case of the reasonable design procedure adopted, the construction cost could be saved at least 15 ~ 28%. It could be concluded that BDH PLT should be needed for the foundation construction cost reduction of the high-rise building structures.

• Proceedings of the Korean Geotechical Society Conference
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• 2000.11b
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• pp.139-151
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• 2000

Rockfall protection fence is one of the most common rockfall protection measures in Korea. The fences have been constructed in almost every hazardous cutslopes along national highway in Korea. However, the capability and performance of the fence as rockfall protection system are seldom known since no field test which can provide information on the response and the behavior of fence was carried out. This is the first full scaled rockfall test in Korea. The objectives of the test are to provide the information on the behavior and the capability of fence and to propose the design specifications for the fence. In this test, four different systems have been selected and tested. For each test, the rockfall impact energy was analyzed and the response and behavior of the system were investigated.

• Proceedings of the Korean Geotechical Society Conference
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• 2000.11b
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• pp.183-195
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• 2000

Slopes near a dam body can be categorized into 4 groups, such as right and left abutment slopes, reservoir slopes, slopes along the access road and slopes along the relocated road. For each of the geological investigation, the design standards, the evaluation methods of safety and the maintenance methods, both abutment slopes in the four dams have different characteristics from the conventional cut slopes in that they can severely affect the dam safety. From this point of view this study compares and analyzes the geological investigation methods, the status of design and construction, evaluation method of safety, and monitoring & maintaining methods for four major dams in Korea, such as Soyanggang dam, 'Andong dam, Chungju dam and Boryong dam.

• Proceedings of the Korean Geotechical Society Conference
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• 2000.11b
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• pp.235-239
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• 2000

For the calculation of internal stability, the hypothesis in conventional design is on the basis of two distinct zones, which are 'active zone' and 'passive zone'. This means that there is an abrupt discontinuous transition from active to passive states across a potential failure line. The existence of a discontinuity of this nature appears physically unreasonable, especially from kinematic considerations. A series of pull-out model tests was undertaken from a wall being rotated about the toe to find the strain distribution mobilized from near the wall face into the deep, stable zone through the centre plane. With this finding of transition zone, the objective of study is aiming at identifying the likely effect of this zone in designing method by comparing with the prevailing design method.

• Proceedings of the Korean Geotechical Society Conference
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• 1995.10a
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• pp.211-216
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• 1995

In recent years, Natm has been successfully applied to difficult ground conditions with the use of soil-perservention methods which promote face stability and restrict excessive ground movement. When the tunnle excavation od made through difficult ground like highly weathered rock, the umbrella arch method is often adopted which pre-reinforceas tunnel crown periphery using a stiff shell-shaped structure. The umbrella arch method was originally developed in Itali, and has recently been confirmed its effectiveness in Korea as well. However, no in depth study on the umbrella arch method has been conducted ans as a result no rational analysis/design method is available at present. Therefore this study was undertaken with the aim of identifying the basic reinforcing mechanism and satablishing both qualitative and quantiative relationships between various design parameters and ground movements.

• 기술발표회
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• s.2006
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• pp.292-302
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• 2006

국내 건설산업은 현재 기술보다는 수주위주의 경쟁이 치열함으로서 종합기술 수준은 세계 25위권, 기획.설계 능력은 선진국의 70% 수준에 불과한 취약한 기술경쟁 기반과 시공 중심의 생산구조를 갖고 있다. 이러한 건설부문의 문제점을 극복하고자 정부는 2015년까지 건설 기술력 수준을 선진국의 90%까지 끌어올리기 위해 건설 분야의 연구개발 투자규모 확대 등 다양한 계획을 추진 중에 있다. 본 고에서는 상기와 같은 상황 속에서 장차 미래사회에 있어 건설교통 분야의 기술발전을 이끌 도시성장, 인구변화, 에너지 및 자원 고갈, 기후변화 등 대응기술에 대한 연구개발사업계획을 소개하고, 국내 건설기술의 재도약의 일환으로 2006년을 기점으로 시작된 R&D 혁신로드맵의 체제와 그 의미를 소개하였다.