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Yanggu, South Korea

Yea G.-G.,Sambu Construction Co. | Kim T.-H.,Dong - A University
Marine Georesources and Geotechnology | Year: 2010

The behaviors of the marine sedimentary ground improved by sand compaction pile (SCP) method are analyzed. To do this, the results of upheaval characteristics of the sea floor, undrained shear strength, and horizontal consolidation coefficient (consolidation) are investigated. Due to SCP installation on ground, as thickness of a soft clay layer increases, upheaval height increases and upheaval angle decreases. Undrained shear strength of disturbed ground due to SCP construction decreases in early stage after completion of construction, but it shows a trend of recovering as months elapse. As the result of piezocone penetration dissipation tests, consolidation delay phenomenon by the disturbance due to SCP installation clearly is identified and its degree is dependent on the replacement area ratio of SCP and the location of ground. © Taylor & Francis Group, LLC. Source


Yea G.-G.,Sambu Construction Co. | Kim T.-H.,Korea University | Kang G.-C.,K water
Marine Georesources and Geotechnology | Year: 2015

A study was carried out to establish an empirical method to estimate unit skin friction of rigid large-size pneumatic caissons. Field instrumentation during construction and installation of the rigid pneumatic caissons was in place, where the water load, air pressure, and reaction force (contact pressure) were measured accordingly. Using these data and the weight of caisson, the unit skin friction was estimated. The unit skin friction distribution with depth decreased in a parabolic shape. The unit skin frictions predicted by the K n and λ methods used for deep foundations were compared with the measured data. The comparison showed that the K n method is more suitable for estimating the skin friction of the large-size rigid pneumatic caisson than the λ method in this particular construction project. © 2015, Taylor & Francis Group, LLC. Source


Yea G.-G.,Sambu Construction Co. | Kim T.-H.,Dong - A University
Marine Georesources and Geotechnology | Year: 2012

During the construction of the pneumatic caissons supporting the towers of the Youngjong Grand Bridge in South Korea, the cutting edge of the Incheon side caisson was equipped with a number of strategically positioned reaction force gauges to measure vertical cutting edge contact pressures and to assess the contact pressure distribution developed during caisson sinking through a range of ground conditions. The magnitude of the contact pressure and its distribution under a foundation varies depending principally upon the physical properties of the founding material, foundation dimensions and the rigidity of the foundation construction. This requires the designer to make an engineering judgment based on the results of the site investigation and the rigidity of the foundation. © 2012 Taylor and Francis Group, LLC. Source


Yea G.-G.,Sambu Construction Co. | Kim T.-H.,Korea University | Kim J.-H.,Korea Institute of Water and Environment | Kim H.-Y.,Sambu Construction Co.
Journal of Performance of Constructed Facilities | Year: 2013

This paper provides a detailed study of remediation work on the core zone of a damaged earth-fill dam. The relevant material includes a review of the dam surface survey data, leakage monitoring data, drilling method, grouting material, and drilling and grouting procedure. A compaction grouting method was selected as the remediation technique. In addition, the reduction and prevention of leakage and settlement were assessed. Compaction grouting was successful for filling voids, closing channels, and compacting the disturbed core soils. The loose or voided zones were properly filled, and the leakage was reduced after compaction grouting. Verification of the compaction grouting work was performed by evaluating the grouting pressures and volumes injected internally and by monitoring the dam leakage rate and tracer externally. All of these factors provide a good indication of changes inside the core of the dam, including reduction or closure of the leakage channels in the dam core. © 2013 American Society of Civil Engineers. Source


Kim M.H.,Inje University | Park K.H.,Sambu Construction Co. | Yea G.K.,Sambu Construction Co. | Kim S.K.,Sambu Construction Co. | Choi Y.K.,Kyungsung University
14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering | Year: 2011

Tapered Gravel Compaction Piles(TGCP) can change the diameter effectively along the certain depth during the construction process, unlike the conventional Gravel Compaction Piles(GCP). TGCP have the positive effects on the bulging problems and slope stability. Especially this construction method can also expect the effect of constructability improvement and the facilitation of drainage consolidation at the deep place acting the high lateral confining earth pressure. Both TGCP and GCP installed into the soft ground on the two neighbors location used with the same gravel quantity have been analyzed the behavior characteristics for bearing capacity based on the field load test. The construction length of GCP was 12.5m ∼ 18.0m and construction diameter of GCP was 700mm uniformly. The diameter of TGCP in the upper part was 800mm at the depth of 5.5m ∼ 8.0m. However, the diameter of TGCP in the lower part was D600mm at the depth of 7.0m ∼ 10.0m. According to the experimental result, the allowable bearing capacity of group pile for TGCP had appeared was 1.34∼2.48 times increase. Group piles showed that the bearing capacity by making the taper shape were increased. Also, it appeared that TGCP have much more allowable bearing capacity than GCP in the soft ground. Source

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