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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Geotechnical Society
Journal Basic Information
Journal DOI :
Korean Geotechical Society
Editor in Chief :
Seong Wan Park
Volume & Issues
Volume 21, Issue 10 - Dec 2005
Volume 21, Issue 9 - Nov 2005
Volume 21, Issue 8 - Oct 2005
Volume 21, Issue 7 - Sep 2005
Volume 21, Issue 6 - Aug 2005
Volume 21, Issue 5 - Jul 2005
Volume 21, Issue 4 - Jun 2005
Volume 21, Issue 3 - Apr 2005
Volume 21, Issue 2 - Mar 2005
Volume 21, Issue 1 - Feb 2005
Selecting the target year
The Stability of Excavated Soft Ground Supported by Sheet-pile Walls
Hong Won-Pyo ; Kim Dong-Uk ; Song Young-Suk ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 5~14
Based on the field measuring data obtained from excavation sections in Inchon International Airport project, the relationships between the horizontal displacement of sheet-pile walls and the deformations of soft ground around the excavation were investigated. The horizontal displacements of walls according to supporting method occur, and the displacements were found to become larger in the order of anchors, anchors with struts, and struts. The depths of maximum horizontal displacement are varied with supporting systems. If the stability number shows lower than
, the maximum horizontal displacement and the velocity of maximum horizontal displacement are respectively developed less than
of excavation depth and 1mm/day. When the stability number shows lower than
, the maximum horizontal displacement and the velocity are respectively developed less than
of excavation depth and 2mm/day. Also, when the stability number shows more than
, the maximum horizontal displacement and the velocity rapidly increase. Also, the maximum horizontal displacement is found to increase rapidly when N value is less than 10. The maximum horizontal displacement increases with decreasing the factor of safety against basal heave (Terzaghi, 1943), and the maximum horizontal displacement is found to increase rapidly when the factor of safety against basal heave is greater than 2.0. This value can be proposed as the criterion for the factor of safety against basal heave in Korea.
Soil Water Characteristic Curve for Weathered Granite Soils - A Prediction Method
Lee Sung-Jin ; Lee Hye-Ji ; Lee Seung-Rae ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 15~27
In this paper, a method reasonably predicting soil water characteristic curve of domestic weathered granite soils was suggested, based on the test results obtained through experiments. In other words, a method to estimate the parameters of Fredlund and Xing's equation using an ANN (artificial neural network) was proposed. The particle size distribution, compacted water content and void ratio were used as input data in the ANN model for predicting the parameters, since it was found that these basic soil properties affect the parameters obtained from the test results and the fitting results of SWCC. The network model proposed in this study to obtain the parameters of Fredlund and Xing's SWCC equation produced reliable predictions, and the precision of the prediction results from the proposed method was high, in comparison with the prediction results of other methods.
Model Tests on the Lateral Behavior of Soldier Pile Type Breakwater Installed in Sand
Jang In-Sung ; Lee Goo-Young ; Kwon O-Soon ; Park Woo-Sun ; Jeong Weon-Mu ; Kim Byoung-Il ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 29~41
The small harbors and fishing ports in Korea have less economic efficiency if the previous construction method of breakwater would be utilized due to bad ground conditions in spite of low design waves. Therefore, it is necessary to develop a new type breakwater economically applicable to the cases with low design wave. In this study, a soldier pile type breakwater, which is found to be economic and can be easily constructed on the ground without any need of treatment of the ground, was newly introduced. The effects of embedded depth, reinforcement methods as well as pile types including saw type and flat type on the lateral behavior of the proposed breakwaters installed in loose sandy soils were investigated from model test. The test results revealed that the lateral resistance increases by increasing the embedded depth and by adopting the reinforcement techniques such as raker and anchor. Furthermore, it was also verified that the saw type breakwater shows better geotechnical performance than the flat type breakwater.
Experimental Study on Enhanced Jet Grouting by Cavitation Theory
Lee Sang-Ik ; Kim Chang-Jong ; Oh Se-Hun ; Kim Young-Uk ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 43~50
Jet grouting method is widely being used in many geotechnical problems, especially for the purpose of reinforcement of clayey ground and cut-off wall of sandy ground. However, its design depends on highly empirical method, in which many researches have been undertaken. This study investigated the effect of cavitation on jet grouting. Small-scaled model tests were carried out using specially designed and fabricated device to analyze the effect of cavitation on jet grouting with various test conditions including ground condition, injection pressure, and injection time. The test results show that cavitation has a significant effect on jet grouting, and it has a potential for engineering application.
Assessment of Frictional Characteristic for the Segmental Retaining Wall Unit
Kim Jin-Man ; Cho Sam-Deok ; Oh Se-Yong ; Lee Dae-Young ; Paik Young-Shik ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 51~58
The use of geogrid for SRW systems and bridge abutment has increased rapidly over the past 10 years in Korea. The concept of segmental retaining walls and reinforced soil is very old and for example The Ziggurats of Babylonia(i.e. Tower of Babel) were built some 2,500 to 3,000 years ago using soil reinforcing methods very similar to those described in current design. Modern SRW(Semental Retaining Wall) units were introduced in 1960's as concrete crib retaining wall systems. In this paper, the friction properties between segmental concrete units and geogrid are investigated by performing various tests.
Centrifuge Model Test on the Bearing Capacity and Failure Mechanism of Composit Ground Improved with Slag Compaction Piles
Yoo Nam-Jae ; Park Byung-Soo ; Jeong Gil-Soo ; Koh Kyung-Hwan ; Kim Ji-Sung ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 59~67
This paper presents experimental and numerical research results of centrifuge model tests performed to investigate the geotechnical engineering behavior of slag compaction pile as a substitute of sand compaction pile. For centrifuge model tests, bearing capacity of composit soil improved with slag compaction piles, stress concentrations in-between pile and soft clay, settlement characteristics, and failure modes were investigated with slags differing in their relative density. A slag was found to be a good substitute for a sand since the slag compaction pile model showed a greater yield stress intensity up to
than the sand compaction pile model under the identical testing conditions. Stress concentration ratio tended to increase with the relative density of slag pile and the clear shear lines in the piles were observed at the depth of
(D=dia. of model pile) from the top of the piles after loading tests. Numerical analysis with a software of CRISP, implemented with the modified Cam-clay model, was carried out to simulate the results of centrifuge model test. Test results about characteristics of load-settlement curves and stress concentration ratio are in relatively good agreements with numerical estimations.
An Experimental Study on the Stabilizing Effect of Piles against Sliding
Hong Won-Pyo ; Song Young-Suk ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 69~80
In order to investigate the stabilizing effect of piles against sliding, a series of model tests were carried out. The model apparatus was designed to perform the model test of slope reinforced by stabilizing piles. The instrumentation system was used to measure the deflection of stabilizing piles during slope failure. The stabilizing effect of the piles in a row with some interval ratio is larger than the isolated pile without interval ratio. Because the prevention force of piles in a row increased due to the soil arching effect between piles during slope failure. Especially, the maximum value of prevention ratio was presented at 0.5 of interval ratio. If the required prevention ratio is 1.1, the interval ratio must be installed from 0.5 to 0.8. Also, the stabilizing effect of piles against sliding is excellent at the interval ratio between 0.5 and 0.8. This value can be proposed as the criterion of the interval ratio between piles against slope failure.
Characteristics of Bearing Capacity and Stress Concentration of Clay Ground Improved with Sand Compaction Piles
Yoo Nam-Jae ; Park Byung-Soo ; Jeong Gil-Soo ; Koh Kyung-Hwan ; Kim Ji-Sung ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 81~91
This paper is the results of experimental and numerical works on the investigating design factors influencing the bearing capacity, the ratio of stress concentration, and the failure mechanism of the clay ground improved with sand compaction piles (SCP). In order to find the behavior of the clay ground improved with SCP, extensive centrifuge model experiments were carried out for each of the SCP replacement ratio of 20, 40, and
, the non-plastic fine contents in sand of 5, 10, and
, and the ratio of the improved width to the loaded area (W/B) of 1, 2, and 3. The commertially available software of FEM, CRISP, was used to analyze test results by performing numerical estimations. In these numerical analyses the sand compaction piles and the clay ground were simulated as a linear elastic and plastic constitutive model and the modified Cam-clay model, based on Critical State Soil Mechanics, respectively,
Evaluation of Skin Friction on Large Drilled Shaft
Hong Won-Pyo ; Yea Geu-Guwen ; Lee Jae-Ho ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 93~103
Both static pile load test with load transfer measuring system and the pile dynamic load test are performed to estimate the skin friction and behavior characteristics of a large drilled shaft. And the numerical modeling of large drilled shaft is performed by applying the FDM program. Since the magnitude of friction resistance depends on the relative displacement between soil and shaft, load and displacement at the arbitrary depth along the large drilled shaft are estimated to analyze the correlation. According to the measuring results of load transfer, unit skin friction along the large drilled shaft was fully mobilized at gravel layer in the middle of shaft and the frictional resistance transmitted to bedrock was relatively small. Also, even for the same drilled shaft, the results of PDA and static load test are different with each other and the difference is discussed.
Recent Development of In-hole Seismic Method for Measuring Dynamic Stiffness of Subsurface Materials
Mok Young-Jin ; Jung Jin-Hun ; Kim Young-Su ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 105~114
An in-hole seismic method, which has been developed for measuring dynamic properties of subsurface materials, was improved in terms of cost effectiveness and practicality. The upgraded features include the motorized triggering system rather than the manual prototype version in the previous studies and a connecting rod between source and receiver in the module. The probe, thus, can be used for the field measurements of soil properties as well as those of rocks. The performance of the probe has been evaluated through extensive cross-hole tests and in-hole tests at various sites.
A Study on Slope Safety Factor Variation by Pile Construction Depth and Space
Lee Seung-Ho ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 115~121
At present, continual road constructions to connect from city to city are needed due to the geographical feature of Korea that about
of the territory is mountainous area. Thus, the generation of large cut-slope has been inevitably formed. As a means of reinforcement on the cut-slope, in case of destructive disasters such as a snowstorm, pile embedment method is widely adopted. The pile embedment method is to resist possible move of soil by embedding piles from the surface to the immovable ground and then delivering the load from the piles to the immovable ground. In this study this writer analyzes the limitation of empirically used pile construction depth and its spacing through the numerical analysis. As a result, he suggests the most effective pile construction depth and space.
Dynamic Characteristics of Gravity Quay Wall during Generation of Excess Pore Pressure in Backfill Soils
Hwang Jae-Ik ; Kim Myoung-Mo ;
Journal of the Korean Geotechnical Society, volume 21, issue 1, 2005, Pages 123~131
In this research, shaking table tests for three types of gravity quay wall system were performed to analyze the influence of excess pore pressure in backfill soils on the natural frequency of gravity quay wall systems. The elastic modulus of backfill soils was also estimated from the back analyses using the results of the shaking table tests. From the test results, it was observed that as the magnitude of excess pore pressures increased, the natural frequency of the gravity quay wall system decreased and vice versa. The natural frequency was about 44Hz when no excess pore pressure was generated in backfill soils, and decreased to about 16Hz at the pore pressure ratio of 0.55. The elastic modulus of backfill soils reached the constant maximum value when the pore pressure ratio was less than 0.2, and abruptly decreased as the pore pressure ratio became larger than that. The elastic modulus of backfill soils decreased to
of the maximum value when the pore pressure ratio was 0.55.