• Journal of the Korean GEO-environmental Society
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• v.18 no.6
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• pp.39-44
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• 2017

The behavior of the lateral resistance beyond the yield condition on single pile has been evaluated by comparative analysis. Pushover analysis of single pile has been performed to compare to the results on lateral load test of the pile foundation. The study for the behavior beyond the yield condition on single pile had been performed on the results on the lateral load test and pushover analysis considering mechanical conditions of the ground soil and the pile foundation.

• Proceedings of the Korean Geotechical Society Conference
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• 1999.03a
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• pp.259-266
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• 1999

In case that pile cap is in direct contact with underlying soil, the bearing mechanism for pile groups, including direct bearing effect of cap and its induced influence on pile-soil-cap interaction, should be properly considered. In this paper, the effects of pile caps on behaviors of pile groups in sandy soils were investigated by model tests, which consist of tests on 3 by 3 pile groups with/without contact on subsoil, single pile with/without contact and cap as a shallow foundation. Also, the influences of pile spacing in group piles on contact effects were investigated. The test results showed that the load carrying capacity of pile cap was large enough not to be ignored. However, the interaction effects due to contact between cap and subsoils were not revealed obviously in working load range. And in the design of pile groups, the bearing effect of pile cap when contacted with subsoils, can be reflected by simply summing up load settlement behaviors of each cap and group piles without contact.

• The Journal of Engineering Geology
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• v.30 no.2
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• pp.131-145
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• 2020

The construction on these flimsy ground, activation of unsymmetrical surcharges, can often cause of the embankment road lateral flow or the destruction of the activities. In this study, the stability of the abutment pile foundation installed on soft ground and its behavior has been evaluated. The behavior of the abutment pile foundation under lateral flow was studied by verifying the behavior and reinforcement effects of the abutment pile foundation of previous studies about horizontal loads acting on the pile due to the lateral flow of the ground by performing finite element analysis. As a result of the consolidation analyses, the undrained cohesion or the strength of the soft ground, was increased by about 1.1 to 1.8 times by the increase in the strength of the soft ground according to the degree of consolidation. It is deemed reasonable to use 3.8 cm of the allowable displacement both economically and constructively, but considering the importance of the structure and the uncertainty of the ground, measurement shall be carried out during construction and thorough safety management of the lateral flow should be done.

• Proceedings of the Korean Geotechical Society Conference
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• 2002.03a
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• pp.389-396
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• 2002

Engineers should be careful in the design of bonding piles into pile caps because they are weak points in the pile foundation. Therefore in this study, the mechanism of bonding piles into pile caps was explained, and the design method of the composite bonding method was proposed. And the proposed design method was verified in comparison with the result of the full scale test. Also, the characteristic for the bearing capacity and the mechanism of compressive load of bonding method were analyzed.

• Journal of the Korean Geotechnical Society
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• v.17 no.4
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• pp.117-126
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• 2001

도로교의 대표적인 기초형식인 말뚝기초에 대한 내진설계방법으로 여러 가지 방법들이 제안되어 있다. 이 중 동적해석법과 같은 복잡한 절차에 의한 해석은 적용성에 한계가 있을 수 있고, 실무에서의 적용상 많은 어려움이 예상되었다. 본 연구에서는 등가정적해석법을 이용한 도로교 기초 말뚝에 대한 간편한 내진설계절차를 제안하였으며, 사례에 적용하였다. 또한, 제안된 간편한 내진설계절차에 사용할 수 있는 해석코드의 적용성을 확인하기 위하여 수식적 정해에 의한 계산결과를 기준 값으로 하여 해석코드에 의한 해석결과들을 비교.분석하였다. 또한, 지진 진동을 이용한 동적 해석결과와 SPS 상호작용(Superstructure - pile - soil interaction)을 고려한 해석결과를 수식적 정해에 의한 결과와 비교.분석하였다.

• Proceedings of the Korean Geotechical Society Conference
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• 2008.10a
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• pp.767-774
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• 2008

The spot where bottom foundation of a marine bridge is constructed is deep in depth of water and a bedrock, bearing stratum, is very deeply distributed. So, I analyzed material of soil profile and then evaluate bearing capacity and safety of settlement when a stake of site construction is designed using a projection cast in place concrete pile and a sacrifice steel cast in place pile. Also, I analyzed and researched pratical affairs like a slime processing and plumbing maintenance in supervision of execution.

• International Journal of Air-Conditioning and Refrigeration
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• v.16 no.4
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• pp.109-116
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• 2008

Ground temperature restoration characteristics are the crucial factors to evaluate whether a ground source heat pump system can keep long time steady operation. They are mainly dependent on soil thermal properties, layout of pile group, operation/shutoff ratio, cooling/heating load, thermal imbalance ratio and so on. On the one hand, several types of vertical pile foundation heat exchangers are intercompared to determine the most efficient one by performance test and numerical method. On the other hand, according to the layout of pile group of a practical engineering and running conditions of a GSHP system in Shanghai, the temperature distribution during a period of five years is numerically studied. The numerical results are analyzed and are used to provide some guidance for the design of large-scale GSHP system.

• Journal of the Korean GEO-environmental Society
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• v.21 no.5
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• pp.13-21
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• 2020

In this study, the reliability of the lateral spring constant (k1) applied during design of pile foundation for bridge abutment was evaluated. To do this, the reliability of the factors related to the prediction of the lateral displacement of the abutment pile foundation, which was designed based on the displacement method proposed by Chang (1937), was analyzed. The data used for analysis were the design statements of ◯◯ bridge and ◯◯ IC2 bridge. Then, it was derived by comparing with the numerical analysis (p-y analysis) based on the basic data.

• International Journal of High-Rise Buildings
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• v.4 no.4
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• pp.261-270
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• 2015

Hong Kong is a renowned small city with densely placed skyscrapers. It is no surprise that heavy duty or even mega foundations are built over the years to support these structures. To cope with the fast construction pace, several heavy deep foundation types have been widely adopted with some prescribed design rules. This Paper has selected two commonly adopted but distinctive foundation types, namely large diameter bored piles and percussive steel H-piles to illustrate the special design and construction considerations related to these pile types in related to local context. The supervision requirement in related to foundation works for which again may be unique in Hong Kong will also be highlighted. A case history is also discussed in the later part of the Paper to illustrate the application of one of these foundations and to highlight the importance of considering foundation design and basement excavation method in a holistic manner.

• Proceedings of the Korean Geotechical Society Conference
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• 2002.03a
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• pp.597-604
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• 2002

The piled raft foundation Is an innovative design concept to reduce both the maximum settlement and differential settlements caused by concentrated building loads and load eccentricities, and also to reduce the bending moments of the raft. The main concern given in the design of piled raft foundations is proper judgments both of relative proportions of loads carried by the raft and piles, and of the effect of the pile support on the maximum and differential settlements In the present study, the piled raft foundation used in the foundation system of Richensia Building at Youido, Seoul is introduced and is carried out analyzing the results of field tests such as plate load tests, large plate load test, pile load test, and piled raft load test.