• Proceedings of the Korean Geotechical Society Conference
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• 2005.03a
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• pp.1420-1425
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• 2005

In a case of an example in Korea, some areas of Yangsan near Busan which exist on soft ground with aquifer, showed us some difficulties of the preparing for housing site and earth structures. From these experiences, recently, the development and research of technology is getting increased, which minimize the influence to the environment from construction work, which is in an agreement with eco-friendly construction in terms of the reasonable processing of ground water. On this case study, one area of Japan that has many site on soft ground with aquifer, is introduced as the reasonable processing of ground water. The applications of the technology for ground water in Korea are discussed.

• Proceedings of the KAIS Fall Conference
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• 2007.11a
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• pp.375-377
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• 2007

The purpose of this study was to investigate total $CO_2$ amount of steel and reinforced concrete construction, and compare and analyze $CO_2$ amount on construction-material. And then it was studied about new element that environment compatibility of architecture structure design based on paradigm of environment age. Architecture action should have proceeded course that reduce burden of the earth environment in relation between architecture and environment and increase contact of human and nature. As environment compatibility development is emphasized with architecture development, architecture structure design give improvement of one important element that environment compatibility except stability, function, economy and necessary propriety of environment compatability of construction design.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.2
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• pp.147-155
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• 2013

In this paper structural analysis of underground electrical power cable structures which is excavated below the surface of the earth in the downtown area is carried out considering the effect of construction sequence. There are many various life-line facilities below the surface of the earth in the downtown area. MPDAP was used for finite element analysis of underground electrical power cable structures. Three typical sections are simulated by finite element models. Unbalanced equilibrium problems may be occurred when conventional finite element procedures were used for simulation of tunnel excavation. Therefore equilibrium perturbation concept was applied to solve these problems. The effects of time-dependent deformations in advancing tunnel excavation are considered in the stages of construction sequences as using the load distribution factor. It is shown that values of maximum displacement of both soil and rock surrounding underground electrical power cable structures obtained by our numerical studies are less than allowable values.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.10
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• pp.5184-5191
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• 2013

The automated quantity take off technique using BIM authoring tools has been recently issued, and the studies of this method for the accuracy, efficiency, and the unit computing for the simple volume, area and number have been developed. Meanwhile the main concerns such as the details for the level of modelling, and the costs and time for the calculating BOQ item are still required to study. In this paper, the earth works, drainage works, pavement works, and facility works using BIM authoring tools are designed in 3D, and the applicability of automated quantity take off technique using BIM authoring tools is discussed, respectively. As a result, automated quantity take off are limited in the earth works, drainage works, pavement works, and facility works. But Most items of BOQ can be supported in Re-bar model.

• Journal of the Korean Geosynthetics Society
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• v.10 no.2
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• pp.13-19
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• 2011

Precast culvert system is generally constructed with a series of process such as excavation, ground mitigation, placement of culverts, anti-leakage packing between adjacent culverts, post-tensioning for PS strands and backfilling. In this process inappropriate ground mitigation often causes differential settlement and, correspondingly, makes water-leakage to be occurred between adjacent boxes. This study was performed to understand the behavioral characteristics of recently proposed precast foundation plate to support precast culvert system through on-site pilot construction. The gap between two adjacent culverts, increment of earth pressure at the bottom of culvert, vertical settlement of top of the culverts were monitored using various sensors. The monitoring results showed that the proposed foundation plate provides better culvert system in the points of less gap development, earth pressure and settlement at the adjacent of two culverts.

• Journal of the Korean Geosynthetics Society
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• v.2 no.2
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• pp.3-11
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• 2003

Researches on the induced trench method using compressible materials such as clay, mud, straw, or EPS block have been performed to reduce the load acting on buried conduits under a high fill. The induced trench method has the problems that the arching area due to the compressible arching material is one dimensional or localized in a narrow zone. The main purpose of this study is to solve the problems of the induced trench method mentioned above. The various types of laboratory model tests are conducted to find the effects of the variations of EPS block width, multilayer application, soil density, and diameter of the flexible steel pipe. A series of model tests was conducted to evaluate the reduction of earth pressure on conduits using EPS block. Based on modeling test it is found that the magnitude of vertical earth pressure on conduits was reduced about 60% compared with conventional flexible conduit systems.

• International Journal of Highway Engineering
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• v.10 no.1
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• pp.41-48
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• 2008

This paper deals with the characteristics of earth pressure to the debris-fall prevention walls which usually are installed in front of steep slope. Such walls have narrow backfill width where the active soil wedge can not be developed fully. The earth pressure to such walls ue affected by the movement of wall and arching effects due to the friction developing on the surface of adjacent ground slope and wall and therefore cannot be analyzed and calculated reliably. The study is carried out through laboratory model tests using centrifuge test. Test results reveal that the earth pressure to the debris-fall prevention wall depends largely on the inclination angle of the ground slope and the wall movement. The earth pressure reduction due to wall movement was observed at the upper half of wall, while the arching effect was significant at the lower half especially in the case of steep ground slope. It can be said that from the result of this study in the design of a debris-fall prevention wall the earth pressure should be determined considering the inclination of ground slope and the condition of wall movement during and after construction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3916-3922
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• 2014

Generally, the retaining wall is becoming unstable as the height is higher. On the other hand, the retaining wall with the relieving platform is more stable and more economical than any other type of retaining wall, because the relieving platform the reduce the lateral earth pressure. In this study, numerical analyses were carried out for 15 cases varying with the type of retaining wall, length and location of the relieving platform and the backfill type. From the numerical analyses, the reduction of the lateral earth pressure was checked and the results of numerical analyses were compared with that of model tests and theoretical equations. As the results of this study, the lateral earth pressure of the retaining wall with the relieving platform is considerably less than that of cantilever wall. And the of magnitude of the lateral earth pressure is affected by the length and location of relieving platform and the backfill type.

• Journal of the Korean GEO-environmental Society
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• v.7 no.5
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• pp.41-48
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• 2006

Crib wall is one of the segmental grid retaining walls using headers and stretchers to establish the framework of the wall. In this method, grids formed by the intersection of headers and stretchers are generally filled with the gravel to maintain the weight of the wall. Therefore, the construction can be carried out with higher speed and much economically when compared with the concrete retaining wall. Furthermore, it has high drain capacity, and environmentally friendly aspects also have been pointed out because the possibility of the planting at the front of the wall. However, in the crib wall method, the relative movement between the individual headers and stretchers was generally recognized, and stress redistribution in the gravel filling was also observed when subjected to the external loading and self-weight of filling. Therefore, it has been thought that the distribution of the earth pressure in the crib wall system differ from that of the concrete retaining wall. In this study, the surcharge tests using the scaled model crib wall was carried out to observe the distribution of the earth pressure in the segmental grid retaining wall. The earth pressure was measured in the six specified height of wall, and the distribution of the pressure was analyzed. Furthermore, the earth pressure by computation or by the test using the concrete retaining wall was also considered to make comparison.

• Tunnel and Underground Space
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• v.13 no.2
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• pp.125-137
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• 2003

Field measurements were carried out in this study to investigate the behavior of cut and cover tunnel such as the distribution and the magnitude of the earth pressure during back fill process. Three kinds of measuring instruments, such as the earth pressure load cell, the concrete strain gauge and the reinforcing bar meter of embedded type in concrete structure were installed and measured. Earth pressure load cells measured the outside forces acting on the tunnel lining with radial directions. Three load cells were installed at the crown, the right and the left shoulder of the tunnel, respectively. Three sets of reinforcing bar meter were installed in the double reinforcements of the tunnel lining and their locations were the same with the position of the earth pressure load cells. Concrete strain gauge was installed only one site of the upper compressive part at the tunnel crown. Based on the measurements, the deformation and the earth pressure acting on the tunnel lining were investigated with the back fill process. Considerations on the validity of the field measurements were paid.