• Journal of the Earthquake Engineering Society of Korea
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• v.7 no.5
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• pp.37-46
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• 2003

Response analysis of buried pipeline subjected to permanent ground deformation(PGD) due to liquefaction is mainly executed by use of numerical analysis or semi-analytical relationship, Especially for the semi-analytical relationship considering transverse PGD, it has somewhat limited applicability : since it has different formula according to the width of PGD and does not reflect various patterns of PGD which is caused by the decrease of soil stiffness, Therefore, in this study, the applicability of existing analytical relationship is closely investigated through the comparison of FEM results at first. And then, based on meaningful contemplation, improved analytical relationship is proposed. The proposed one models the system behavior of buried pipeline as the combination of cable and beam, and thus it is applicable to arbitrary width of PGD, Moreover, it does reflect various patterns of PGD by introducing interaction pattern coefficient. Through the comparison of numerical results using the FEM and the proposed analytical relationship, rational applicability is objectively verified and noticeable considerations are discussed, Moreover, analyses considering the change of PGD magnitude and patterns are performed.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.26 no.12
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• pp.553-558
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• 2014

Geothermal energy can be used with a geothermal heat pump or an earth-to-air heat exchange system (EAHES), which is referred to as a "cooling tube" in Korea. In this study, we suggest EAHES burial guidelines in terms of the parameters of buried pipe length and air velocity regarding the exit air temperature of EAHES. The exit air temperature for EAHES in three regions (Changwon, Busan and Seoul) was calculated with variation in buried pipe length and air velocity at ${\Phi}100mm$ and ${\Phi}200mm$. In conclusion, variation in the buried pipe length is more effective than that of air velocity to achieve the required exit air temperature.

• Journal of the Korean GEO-environmental Society
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• v.9 no.6
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• pp.71-79
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• 2008

The underground conduit laid under different environments exhibits various behaviour according to the ground and external load as well as the loading time and conditions, so on. As the environmental conditions are usually different even within the same area, it is very difficult to correctly predict the stress conditions and behaviour of the underground conduit using currently available theoretical analysis. Especially, it is not yet satisfied in Korea for the evaluation of the underground conduit under the influence of the load of vehicles or unexpected loading conditions. Thus, in this study the assessment for the excavation depth and ground disturbance was carried out with a large box model test and numerical analysis. Numerical analysis was also performed for the assessment of dynamic loading conditions like railway load.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.21 no.3
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• pp.237-243
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• 2003

The complicated facilities on the ground have begun to be laid under the ground as increasing emphasis on the beauty of cities due to centralization. But, as the kind of the facilities have been concentrated on the narrow area, accidents occur due to the difficulty of maintenance and the inaccuracy of location information. In this study, first we constructed the field test model to compare with the method of underground probing. So, we could know that the electromagnetic induction method and GPR(Ground Penetration Radar) are useful. It was acquired the position information for the underground facilities using a RTK-GPS. As the result, we have analyzed the accurate position of the underground facility and show the way improving accuracy in detecting and surveying comparing with the traditional surveying method. Also, we hope to contribute the effective maintenance and prevention of disasters to the underground facility as using underground facilities 3D position with Arcview and building the DB of exact depth and underground facilities information system.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.429-430
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• 2015

HVDC 송전망의 형태는 가공선로(Overhead Transmission Line)와 지중선로(Underground Transmission line)가 있다. 가공선로는 비교적 건설비가 저렴하고 쉽게 설치 할 수 있다는 장점이 있지만 설치할 부지를 확보하기 어렵다는 단점이 있다. 또한 지중선로는 설치되는 지역의 외관을 해치지 않고 주변 환경에 크게 영향을 주지 않는다는 장점이 있지만 케이블을 매설하기 위해서 깊은 관로를 파야하며 이때 많은 비용이 발생하게 된다는 단점이 있다. 새롭게 제시하는 HVDC Pipeline은 두 가지 송전망과 다른 새로운 방식으로서 도로에 Pipeline형태로 HVDC케이블을 얕게 매설하거나 지표면에 도출시키는 방식이다. 도로를 이용함으로서 가공선로의 새로운 부지를 확보해야한다는 단점을 개선하고 깊은 관로로 인해 발생하는 지중선로의 높은 공사비용을 감소시킬 수 있는 방안이라고 생각한다.

• Proceedings of the SAREK Conference
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• 2004.06a
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• pp.224-224
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• 2004

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.3A
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• pp.171-181
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• 2012

The design of high strength underground septic tank stiffened by steel pipe is presented and the ultimate behavior is investigated according to the full scale experiments for three types of specimens. The limitation of the current design specification are pointed out and the general design procedure of private sewage treatment facility are newly developed considering thickness of FRP shell, types of steel pipe stiffer and diaphragm wall. The direct tensile and bending test for FRP material of septic tank were performed. The increase effect of ultimate strength due to the circular steel pipe are investigated by the full scale field test and compared with the results by the finite element analysis.

• 한국지형공간정보학회:학술대회논문집
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• 2001.11a
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• pp.25-50
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• 2001

• Proceedings of the Korean Geotechical Society Conference
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• 1995.10a
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• pp.6007-6014
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• 1995

• JOURNAL OF ELECTRICAL WORLD
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• s.398
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• pp.66-66
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• 2010