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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 27, Issue 12 - Dec 2011
Volume 27, Issue 11 - Nov 2011
Volume 27, Issue 10 - Oct 2011
Volume 27, Issue 9 - Sep 2011
Volume 27, Issue 8 - Aug 2011
Volume 27, Issue 7 - Jul 2011
Volume 27, Issue 6 - Jun 2011
Volume 27, Issue 5 - May 2011
Volume 27, Issue 4 - Apr 2011
Volume 27, Issue 3 - Mar 2011
Volume 27, Issue 2 - Feb 2011
Volume 27, Issue 1 - Jan 2011
Selecting the target year
Numerical Investigation on Load Supporting Mechanism of a Pile Constructed above Underground Cavity
Choi, Go-Ny ; Yoo, Chung-Sik ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 5~16
DOI : 10.7843/kgs.2011.27.1.005
This paper presents the results of a three-dimensional finite element analysis on load supporting mechanism of pile constructed above underground cavity in limestone rock formation. Considering a wide range of cavity conditions, the behavior of pile was studied using the bearing capacity, rock yielding pattern, stress distribution and deformation of pile head and the cavity. The results indicate that the load transfer mechanism of pile, rock yielding pattern and the reduction of bearing capacity of pile significantly vary with the location, size and length of cavity. Based on the results, graphical solutions defining the reduction of the bearing capacity with specific cavity conditions were suggested.
Application of Artificial Neural Networks for Prediction of the Flow and Strength of Controlled Low Strength Material
Lim, Jong-Goo ; Kim, Yeon-Joong ; Chun, Byung-Sik ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 17~24
DOI : 10.7843/kgs.2011.27.1.017
The characteristics of flow and strength of CLSM depend on the combination ratio including the fly ash, pond ash, cement, water quantity and etc. However, it is very difficult to draw the mechanism about the flow, strength and the mixing ratio of each components. Therefore, the method of calculation drawing the flow about the component ratio of CLSM and compression strength value is needed for the valid practical use of CLSM. To verify the efficiency of artificial neural network, new data which were not used for establishing the model were predicted and compared with the results of laboratory tests. In this research, it was used to evaluate the learning efficiency of the artificial neural network model and the prediction ability by changing the node number of hidden layer, learning rate, momentum, target system error and hidden layer. By using the results, the optimized artificial neural network model which is suitable for a flow and compressive strength estimate of CLSM was determined.
Applicability of AE for the Prediction of Rock Slope Failure
Lee, Dong-Keun ; Kim, Yeon-Joong ; Kim, Seok-Chun ; Chun, Byung-Sik ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 25~34
DOI : 10.7843/kgs.2011.27.1.025
In general, many instrumentations of slope rely on theory or experience because on-site accessibility and long term instrumentation are difficult to conduct the instrumentation of slopes. Also the prediction of disaster is very difficult. Therefore experimental research was conducted about an effective method to predict collapse of slope and on-site applicability in this study. The collapse of slope was able to be predicted by applying AE sensor which we call WEAD to the failure criteria. The parameters of AE generated during the collapse of slope were secured through bending shear test. Test construction was applied to the slope with a history and a possibility of collapse. As a result, it is shown that AE parameters do not exceed the failure criterion and is found to be stable slopes. As the real symptoms of collapse did not appear, AE was found to have excellent applicability.
Long-Term Effect of Consolidation on Contaminant Transport
Lee, Jang-Guen ; Kim, Do-Yoon ; Park, Jae-Woo ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 35~40
DOI : 10.7843/kgs.2011.27.1.035
Dredging and disposal is a conventional method to remove contaminated sediments. However, there are some problems in dredging and disposal, such as disturbance of contaminated sediments, disposal site determination, and high construction cost. Recently, in-situ capping which overcomes the problems of dredging and disposal is widely applied to isolate local contaminated sites. Numerical studies, which have been conducted to simulate contaminant transport during in-situ capping, have been concerned mainly with diffusive transport. However, contaminated sediments experience large strain consolidation induced by self-weight because of initially high moisture content of sediments, and contaminant transport results from advection and diffusion. Previous studies focus on contaminant transport during consolidation, but have neglected consolidation effect on long-term contaminant transport in sediments. This study presents numerical simulation results of consolidation effect on long-term contaminant transport in sediments.
Suction Stress Characteristic Curve before Failure in the K
Consolidated Triaxial Tests for the Compacted Residual Soil
Oh, Se-Boong ; Lu, Ning ; Song, Ha-Dong ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 41~52
DOI : 10.7843/kgs.2011.27.1.041
The hypothesis on effective stress of unsaturated soil is validated by
consolidation results of triaxial tests for the compacted residual soil. The stress characteristic curve (SSCC) can describe unsaturated soil behavior on water contents, which was defined from shear strength or from soil water characteristic curves. In this study, it was found that the stress path of
consolidation can also define the SSCC. The effective stress was defined by SSCC.
paths for various matric suctions could be described as a unique line by effective stress. The measured values of
were interpreted by effective stress as a constant with respect to matric suction. Since the SSCC from
consolidation agrees with that from the shear strength, the SSCC from soil water retention curve could describe effective stress behavior consistently on both
consolidation path and stress at failure. The effective stress based on SSCC can describe the entire unsaturated behavior from consolidation to failure.
A Comparison of Analysis Methods on Mechanical Behavior of Stone Column Reinforced in the Soft Sabkha Deposit
Kim, Se-Won ; Lee, Chul-Ho ; Kim, Ki-Ho ; Choi, Hang-Seok ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 53~63
DOI : 10.7843/kgs.2011.27.1.053
In this study, a composite behavior of stone columns reinforced in a soft ground, Sabkha, has been evaluated by performing a series of field measurements and numerical analyses. Field load tests were performed to verify the effect of the composite ground reinforced by stone columns in Kayan, Saudi. The settlement measured in the field test was compared with the settlement calculated by the Priebe method and the numerical analysis using ABAQUS. It is found that the settlement estimated using the Priebe method significantly overestimated the settlement measured in the field test. In addition, it is confirmed that consideration of confining effect exerted by surrounding adjacent stone columns in a numerical simulation is indispensable to estimate accurately the settlement of stone column composite ground.
Long-Term Behavior of Geogrid Reinforced Soil Abutment - A Numerical Investigation
Yoo, Chung-Sik ; Jeon, Han-Yong ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 65~76
DOI : 10.7843/kgs.2011.27.1.065
This paper presents the results of a numerical investigation on the long-term behavior of geosynthetic reinforced soil abutment. The investigation was carried out aiming at identifying the governing mechanisms of the long-term deformation of geosynthetic-reinforced soil abutment subjected to sustained loads during service life. A numerical modeling strategy was first established using the Singh-Mitchell creep model and the power law model, respectively, for the backfill and the geosyntehtic reinforcement. A parametric study on the creep properties of the backfill and the geosynthetic reinforcement was then conducted. The results indicated that a geosynthetic reinforced soil structure backfilled with marginal soil may exhibit substantial long-term deformation due to the creep effects caused by both the backfill soil and the geosynthetic reinforcement, the magnitude of which depends largely on the creep properties. This paper highlights the importance of considering the creep effect on load supporting geosynthetic reinforced soil structures when the long-term serviceability requirement is of prime importance.
Development and Verification of Static-Dynamic Cone Penetrometer
Bae, Myeong-Ho ; Yu, Jung-Dong ; Kim, Ju-Han ; SaGong, Myung ; Lee, Jong-Sub ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 77~86
DOI : 10.7843/kgs.2011.27.1.077
The advanced geotechnical information has been required to determine the accurate design parameters for complex construction. However, the Standard Penetration Test (SPT), which has low reliability, has been used to estimate the subsurface condition in the field. The objective of this paper is development and application of the Static-Dynamic penetrometer, which detects the resistances in soft clay, sand and rock. The energy losses according to the rod connection methods (perfect or non-perfect connection, and number rods) are experimentally evaluated. The reflection and transmission ratios are used to investigate the energy loss by a simulation. The static-dynamic cone penetrometer, in which the accelerometers and strain gauges are installed on the cone tip and the rod head, is used to estimate the energy loss during penetration by impacts. The experimental and simulation studies show that the transferred energy through rods with non-perfect connection dramatically decreases. Furthermore, the transferred energy on the rod head is not the same as that on the cone tip. This study demonstrates that the energy loss should be evaluated on the cone tip.
Estimation of Void Ratio of Sandy Soil Using X-ray CT Scan
Kim, Kwang-Yeom ; Shin, Hyu-Seong ; Heo, Seong-Jun ; Yim, Sung-Bin ; Kwon, Young-Cheul ; Kim, Hong-Taek ;
Journal of the Korean Geotechnical Society, volume 27, issue 1, 2011, Pages 87~97
DOI : 10.7843/kgs.2011.27.1.087
In this study, a new methodology by using the X-ray CT scan is proposed for estimating void ratio of sandy soil. The general problems in high resolution X-ray CT scan such as beam hardening and ring artifact had been successfully settled up using thin metal plate filter and some calibration process. In order to calculate the void ratio of sand from its CT image, the procedures and algorithm for CT image processing are developed. CT scan tests for Joomunjin sand are carried out to verify its applicability to void ratio testing.