A newly developed state-of-the-art geotechnical centrifuge in Korea

Kim, Dong-Soo; Kim, Nam-Ryong; Choo, Yun Wook; Cho, Gye-Chun

doi:10.1007/s12205-013-1350-5

Cited by 151 publications

(41 citation statements)

References 5 publications

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“…The experiments were conducted at the KOCED Geo-Centrifuge Testing Centre at KAIST using an earthquake simulator mounted on the centrifuge (Kim et al, 2013a(Kim et al, , 2013b). An equivalent shear beam (ESB) model box, which minimises the boundary effect on the soil, was used for dynamic centrifuge tests (Lee et al, 2013).…”

Section: Dynamic Centrifuge Modellingmentioning

confidence: 99%

Assessment of horizontal seismic coefficient for gravity quay walls by centrifuge tests

Lee

Jo³

et al. 2017

Géotechnique Letters

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In the simplified analysis of seismic design of gravity quay walls based on the pseudo-static approach, selection of an appropriate horizontal seismic coefficient (k h ) is important for computing the equivalent pseudo-static inertial force. However, there is no unified standard for defining k h . There are conflicts among the existing k h definitions regarding whether it considers (a) the effect of wall height on maximum horizontal acceleration (MHA) used in the determination of k h or (b) the application of correction factor for k h according to seismic performance grade. This paper evaluates the relevance of these conflicts by initially reviewing the k h definitions in the existing codes and guidelines for port structures and then by performing a series of dynamic centrifuge tests on caisson gravity quay walls of different wall heights (5, 10 and 15 m). A review of the existing codes and guidelines has shown that the correction factor for k h should be specified according to the seismic performance grade for the economical design of quay walls. On the other hand, based on the centrifuge tests, it was found that the MHA used in k h calculation and the correction factor for considering seismic performance grade should reflect the effect of wall height.

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Section: Dynamic Centrifuge Modellingmentioning

confidence: 99%

Assessment of horizontal seismic coefficient for gravity quay walls by centrifuge tests

Lee

Jo³

et al. 2017

Géotechnique Letters

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“…2 (Kim et al 2013). For using the electrical resistivity survey system in the centrifuge facility, the SuperSting R8 produced by AGI Co. was utilized with its remote monitoring system (Cho et al 2014).…”

Section: Development Of Electrical Resistivity Survey System In Centrmentioning

confidence: 99%

Physical modeling of land subsidence due to underground cavity and its monitoring by electrical resistivity survey in geotechnical centrifuge

Cho

Bang

et al. 2016

JGS Special Publication

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Hazardous sinkholes started to emerge as a new problem that threatens the safety of the people in Korea. In this study, sinkhole simulation and monitoring in centrifuge test were designed to make environment for related research. Electrical resistivity monitoring system was built in centrifuge facility and 1g preliminary test was performed using ice blocks in order to ensure the simulation of underground cavities in centrifuge model. Subsequently, 20g centrifuge test was performed simulating two types of underground cavities such as existing cavity and water leakage from sewage pipeline. After reaching target centrifugal g-level, groundwater was injected from the base of model box to simulate the groundwater level change. Electrical resistivity survey was conducted continuously to monitor the underground anomalies. The electrical resistivity results from the centrifuge test corresponds well to expected process of sinkhole generation by showing the definite resistivity difference between underground cavities and adjacent soils. From the underground cavity simulation in centrifuge, it is noticed that electrical resistivity survey could monitor the process of underground cavity generation effectively, and developed monitoring system can be applied to further the parametric studies in sinkhole research.

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“…The experiments were conducted in a 5 m platform radius geotechnical centrifuge having a 240 g-ton capacity [23]. A target centrifugal acceleration level of 40 g was adopted, and thus model footings with a prototype length of 2.4 m, 6.0 m, and 12.0 m were simulated according to the centrifuge scaling law.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Settlement Prediction of Footings Using VS

Cho

Kim²,

Park

et al. 2017

Applied Sciences

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Abstract:The shear wave velocity (V S ) is a key parameter for estimating the deformation characteristics of soil. In order to predict the settlement of shallow footings in granular soil, the V S and the concept of Schmertmann's framework were adopted. The V S was utilized to represent soil stiffness instead of cone tip resistance (q c ) because the V S can be directly related to the small-strain shear modulus. By combining the V S measured in the field and the modulus reduction curve measured in the laboratory, the deformation characteristics of soil can be reliably estimated. Vertical stress increments were determined using two different profiles of the strain influence factor (I z ) proposed in Schmertmann's method and that calculated from the theory of elasticity. The corresponding modulus variation was determined by considering the stress level and strain at each depth. This state-dependent stress-strain relationship was utilized to calculate the settlement of footings based on the theory of elasticity. To verify the developed method, geotechnical centrifuge tests were carried out. The V S profiles were measured before each loading test, and the load-settlement curves were obtained during the tests. Comparisons between the measured and estimated load-settlement curves showed that the developed method adequately predicts the settlement of footings, especially for over-consolidated ground conditions.

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A newly developed state-of-the-art geotechnical centrifuge in Korea

Cited by 151 publications

References 5 publications

Assessment of horizontal seismic coefficient for gravity quay walls by centrifuge tests

Assessment of horizontal seismic coefficient for gravity quay walls by centrifuge tests

Physical modeling of land subsidence due to underground cavity and its monitoring by electrical resistivity survey in geotechnical centrifuge

Settlement Prediction of Footings Using VS

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