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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geotechnical Society
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Journal DOI :
Korean Geotechical Society
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Volume & Issues
Volume 25, Issue 12 - Dec 2009
Volume 25, Issue 11 - Nov 2009
Volume 25, Issue 10 - Oct 2009
Volume 25, Issue 9 - Sep 2009
Volume 25, Issue 8 - Aug 2009
Volume 25, Issue 7 - Jul 2009
Volume 25, Issue 6 - Jun 2009
Volume 25, Issue 5 - May 2009
Volume 25, Issue 4 - Apr 2009
Volume 25, Issue 2 - Feb 2009
Volume 25, Issue 1 - Jan 2009
Selecting the target year
Dynamic Shear Properties of Nak-Dong River Sand Determined by Resonant Column/Torsional Shear Test
Kim, Jin-Man ; Park, Yo-Hwan ; Lim, Suck-Dong ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 5~15
Dynamic shear properties of Nak-Dong river sand were investigated to build a soil property database for Nak-Dong delta region. Samples were taken from the estuary and the midstream of the river. Laboratory specimens were prepared by air pluviation method, and were tested by using RC/TS apparatus at various confining stresses, relative densities and numbers of cycles. Shear modulus reduction and damping curves were developed using Ramberg-Osgood and Modified Hyperbolic Models. The developed curves, compared to those reported by other investigators, show only a slight difference. The outcome of this RC/TS experiments can be very important resources when accessing the dynamic response of sandy soils in Nak-Dong delta region in the future.
Numerical Assessment of Load Sharing Behavior on Capped Micropile Foundation Systems
Jung, Dong-Jin ; Park, Seong-Wan ; Cho, Kook-Hwan ; Sim, Young-Jong ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 17~26
The concrete cap, which was established on the top of the micropile, usually considered as an important structural component in micropile supported foundation systems. However, relatively few studies have been made on the load sharing behavior of the capped micropile foundation systems. The primary objective of this study is to assess the load sharing behavior of the capped micropile foundation systems. Therefore, a full-scale test on an instrumented capped micropile is conducted for establishing the load-displacement responses. Nonlinear numerical method was used to quantify the load sharing behavior of the pile cap and micropile respectively. As a result, it was found that the pile cap shares about 50% load from final loading steps in the case of 2 by 1 micropile foundation systems. In the case of 2 by 2, the pile cap shares about 30% load from final loading steps. In addition, the load sharing behavior of the micropile cap becomes larger with an increase in spacing and the battered angle of micropile respectively.
Dynamic p-y Backbone Curves for a Pile in Saturated Sand
Yang, Eui-Kyu ; Yoo, Min-Taek ; Kim, Hyun-Uk ; Kim, Myoung-Mo ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 27~38
In this study, a series of 1 g shaking table model pile tests were carried out in saturated dense and loose sand to evaluate dynamic p-y curves for various conditions of flexural stiffness of a pile shaft, acceleration frequency and acceleration amplitude for input loads. Dynamic p-y backbone curve which can be applied to pseudo static analysis for saturated dense sand was proposed as a hyperbolic function by connecting the peak points of the experimental p-y curves, which corresponded to maximum soil resistances. In order to represent the backbone curve numerically, empirical equations were developed for the initial stiffness (
) and the ultimate capacity (
) of soils as a function of a friction angle and a confining stress. The applicability of a p-y backbone curve was evaluated based on the centrifuge test results of other researchers cited in literature, and this suggested backbone curve was also compared with the currently available p-y curves. And also, the scaling factor (
) to account for the degradation of soil resistance according to the excess pore pressure was developed from the results of saturated loose sand.
A Study on the Rectangular-Shaped Passive Row Piles in Inclined Sand-Ground by Model Test
Bae, Jong-Soon ; Kim, Ji-Seong ; Kwon, Min-Jae ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 39~51
This is a study on rectangular-shaped passive row piles in inclined sand-ground by model tests. The experiment controlled the angle of inclination of ground and induced the ground destruction. We also measured the behavior of row piles, by adjusting the shape, position and spacing of piles. As a result, we confirmed the earth pressure, the lateral resistance, and the effect of depressing on the ground variation working on passive pile. The effect of B-type pile of which the front width is wide is bigger than that of H-type pile of which the side width is wide. We can find out the failure angle of slope, the shared force of pile and soil by using the lateral resistance graph based on slope angle.
Assessment of Rockmass Damage around a Tunnel Using P Wave Velocity Tomography
Park, Chul-Soo ; SaGong, Myung ; Mok, Young-Jin ; Kim, Dae-Young ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 53~60
Construction of a tunnel induces rock masses damage around the tunnel. The degree of damage produced on rock masses will affect on the mechanical and hydraulic behaviors of the rock masses. In this paper, P wave velocity measured by cross-hole test was used to assess rock masses damage around the test tunnel. Initiation of source signal was carried out using mechanical impact at the source installed borehole. In consequence, the generated P wave signal was low noise and apparent wave form, which allows accurate pick-up of first arrival time. From the test, the region where rock damage is expected shows relatively low P wave velocity. In addition, with multiple points of P wave velocity measurement along each cross-hole, two dimensional P wave tomography was obtained. The tomography provides apparent view of the rock damage behind the tunnel. The measured P wave velocity was correlated with features of rock masses, porosity and Q value.
Behavior of Back Ground of the Laterally Loaded Single Pile (II)
Bae, Jong-Soon ; Kim, Ji-Seong ; Kim, Sung-Ho ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 61~73
In this study, we grasped the resistance state of the back ground which had a notable influence on computing the lateral resistance of the laterally loaded single pile in the homogeneous ground by the model test. In order to grasp a resistance behavior, we have to know the deformation area of the back ground and the side failure angle other than the rotation point of pile and vertical failure angle of back ground which were proposed by Bae & Kim in 2008. We found out in this test the characteristics of the behavior of the back ground in accordance with the shape and size of the pile and ground density. We examined the interrelationship of the relative density of sand, the size and the sectional shape of the pile as well.
Numerical Investigation of Load Carrying Capacity of Geogrid-Encased Stone Columns under Foundation Load
Yoo, Chung-Sik ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 75~86
This paper presents the results of a numerical investigation on load carrying capacity of geogrid-encased stone columns to use as load carrying column(s) supporting a foundation load. A validated 3D stress-pore pressure coupled model that can effectively show rapid drainage capability of stone columns and encasement effect of geogrid was adopted and a parametric study was carried out on a number of influencing factors. It is shown that the geogrid encased stone columns can be effectively used as foundation load supporting columns in soft ground. The results of numerical investigation were presented so that the relationship between the load carrying capacity of geogrid-encased stone columns and the influencing factors can be identified. Practical implications of the findings are also discussed.
Probabilistic Distribution and Variability of Geotechnical Properties with Randomness Characteristic
Kim, Dong-Hee ; Lee, Ju-Hyoung ; Lee, Woo-Jin ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 87~103
To determine the reliable probabilistic distribution model of geotechnical properties, outlier and randomness test for analysis data, parameter estimation of probabilistic distribution model, and goodness-of-fit test for model parameter and probabilistic distribution model have to be performed in sequence. In this paper, the probabilistic distribution model's geotechnical properties of Songdo area in Incheon are estimated by the above proposed procedure. Also, the coefficient of variation (COV) representing the variability of geotechnical properties is determined for several geotechnical properties. Reliable probabilistic distribution model and COV of geotechnical properties can be used for probability-based design procedure and reasonable choice of design value in deterministic design method.
Evaluation of Cementation Effect of Jeju Coastal Sediments
Lee, Moon-Joo ; Kim, Jae-Jeong ; Shim, Jai-Beom ; Lim, Chai-Geun ; Lee, Woo-Jin ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 105~115
The Jeju sand was sampled from the beach in Jeju Island and its basic properties were analyzed. The cementation effect of Jeju coastal sediments was evaluated from in-situ tests such as SPT, CPT, and the Suspension-PS test. It was shown from test results that the Jeju sand has high extreme void ratios due to the angularity of grains and the intra-particle voids of hollow particles, similar to typical calcareous sands. From cone penetration test in the calibration chamber, it was found that the cone resistance(
)-vertical effective stress(
) relation of Jeju sand almost matches that of high compressible quartz sand. However, the
correlation suggested for uncemented Jeju sand overestimates the relative density of coastal sediments of Jeju Island due to the cementation effect. From the analysis of the relation of cone resistance, N value, and small strain shear modulus measured in-situ, it seems reasonable to assume that the coastal sediment of Jeju Island is a naturally cemented one.
Characterization of Composite Ground Reinforced with Recycled-Aggregate Porous Concrete Pile (RAPP)
You, Seung-Kyong ; Kim, Se-Won ; Lee, Chul-Ho ; Choi, Hang-Seok ;
Journal of the Korean Geotechnical Society, volume 25, issue 11, 2009, Pages 117~130
In this paper, a series of laboratory chamber tests were carried out to evaluate the applicability of a porous concrete pile fabricated with recycled aggregates (RAPP) for the soft ground improvement. While performing the laboratory chamber tests for the RAPP, the surface settlement, excess pore pressure and vertical stress distribution with time were compared with those of SCP provided by You (2003) under the same experimental condition. In addition, the experimental results were compared with the numerical simulation using ABAQUS in this study. The results show that the settlement reduction is significantly enhanced due to the stress-sharing mechanism between the RAPP and soil formation by stress concentration on the RAPP. Furthermore, the comparison of consolidation rate shows that the RAPP can accelerate consolidation as well, which behaves as a vertical drain.