Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2008.10a
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- Pages.591-604
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- 2008
A Case Study on the Design of Drilled Shaft on Soft Ground in Vietnam
베트남 연약지반에서의 현장타설말뚝 설계 사례
- Seo, Won-Seok (Geotechnical Engineering Team, GS E&C) ;
- Cho, Sung-Han (Geotechnical Engineering Team, GS E&C) ;
- Choi, Ki-Byung (Geotechnical Engineering Team, GS E&C)
- Published : 2008.10.10
Abstract
In this study, two design examples of drilled shafts on soft ground in Ho-Chi-Minh City, Vietnam are introduced. One is for a 27-story apartment and the other is for a Arch bridge over Saigon river. Unlikely the normal cases in Korea, all of the bored pile foundations are supposed to be placed on soil layers. Therefore, skin friction between pile and ground is the most crucial design parameter. Three methods using SPT N value of sandy soil -Korean Road Bridge Code(1996), Reese and Wright (1977), and O'Neill and Reese (1988)- were adopted to obtain an ultimate axial bearing capacity. In order to verify the calculated bearing capacity, 3 sets of static load test and a Osterberg Cell test were performed at an apartment site and a bridge site respectively. LRFD (Load Resistance Factored Design) method was compared with ASD (Allowable Stress Design) method. On application of ASD method, safety factor for skin friction was adopted as 2 or 3 while safety factor for end bearing was 3. The design bearing capacities from ASD method matched well with those from LRFD method when safety factor for skin friction was adopted as 2.
Keywords
- drilled shaft;
- Vietnam;
- skin friction;
- bearing capacity;
- static load test;
- O-Cell test;
- LRFD method;
- ASD method;
- safety factor