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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 23, Issue 12 - Dec 2007
Volume 23, Issue 11 - Nov 2007
Volume 23, Issue 10 - Oct 2007
Volume 23, Issue 9 - Sep 2007
Volume 23, Issue 8 - Aug 2007
Volume 23, Issue 7 - Jul 2007
Volume 23, Issue 6 - Jun 2007
Volume 23, Issue 5 - May 2007
Volume 23, Issue 4 - Apr 2007
Volume 23, Issue 3 - Mar 2007
Volume 23, Issue 2 - Feb 2007
Volume 23, Issue 1 - Jan 2007
Selecting the target year
Geophysical Techniques for Underwater Landslide Monitoring
Truong, Q. Hung ; Lee, Chang-Ho ; Lee, Jong-Sub ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 5~16
The monitoring and investigation of underwater landslide help to understand its mechanism, increase the usefuless of design and construction and reduce the losses. This paper presents three high resolution geophysical techniques electrical resisitance, ultrasonic wave reflection imaging, and shear wave tomography conducted to determine the lab-scaled submerged landslide. Electrical resistance profiles of a soil mass obtained by an electrical resistance probe provide detailed information to assess the spatial distribution of the soil mass with milimetric resolution. An ultrasonic wave image obtained by recording the reflections from interfaces of different impedance materials permits detecting layers and landslide with submilimetric resolution. The pixel based image of immersed landslides is created by the inversion of the boundary information achieved from the traveling time of shear waves. The experimental results show that the ultrasonic wave imaging and the electrical resistance can provide complementary information; and their association with S-wave tomography image can produce a 3-D view of the underwater landslide. This study suggests that geophysical techniques may be effective tools for the detection of the underwater landslides and spatial distribution offshore.
A Study on the Settlement Prediction of Soft Ground Embankment Using Artificial Neural Network
Kim, Dong-Sik ; Chae, Young-Su ; Kim, Young-Su ; Kim, Hyun-Dong ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 17~25
Various geotechnical problems due to insufficient bearing capacity or excessive settlement are likely to occur when constructing roads or large complexes on soft ground. Accurate predictions of the magnitude of settlement and the consolidation time provide numerous options of ground improvement methods and, thus, enable to save time and expense of the whole project. Asaoka's method is probably the most frequently used one for settlement prediction and the empirical formulae such as Hyperbolic method and Hoshino's method are also often used. To find an elaborate method of predicting the embankment settlement, two recurrent type neural network models, such as Jordan model and Elman-Jordan model, are adopted. The data sets of settlement measured at several domestic sites are analyzed to obtain the most suitable model structures. It was shown from the comparison between predicted and measured settlements that Jordan model provides better predictions than Elman-Jordan model does and that the predictions using CPT results are more accurate than those using SPT results. It is believed that RNN using cone penetration test results can be a highly efficient tool in predicting settlements if enough field data can be obtained.
A Model Test of Earth Retention System with Prestressed Wale
Park, Jong-Sik ; Kim, Sung-Kyu ; Joo, Yong-Sun ; Jang, Ho-June ; Kim, Nak-Kyung ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 27~36
A model test was performed to evaluate the stability of a new earth retention system with a prestressed wale. For the model test, the dimensional analysis of a full-scaled earth retention system with prestressed wales was performed. Details of the dimensional analysis of the new earth retention system were presented in this paper. Based on the results of the dimensional analysis, the model-scaled earth retention system with a prestressed wale was simulated. The lateral earth pressures on the wall, the lateral deflection of the prestressed wale, the sectional force on members of the prestressed wale system, and the loads of struts were measured during construction simulation. The measured results were evaluated and compared with those of the design criterion. From the measurements, the behavior of this earth retention system was investigated.
Development of Integrated Management System Based on GIS on Soft Ground
Chun, Sung-Ho ; Woo, Sang-Inn ; Chung, Choong-Ki ; Choi, In-Gul ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 37~46
In the practice of preloading method for soft ground improvement, field engineers need information of ground properties, construction works and field monitoring on ground behaviors of the site. So, integrating all these informations into one database can provide more efficient way for managing and utilizing the data for construction management. In this study, integrated system for construction management of ground improvement sites under preloading is developed. The developed system consists of database (DB) and application program. The database contains all collected data in a construction site and processed data in the system with their geographic information. All informations in the database are standardized from the result of data characterization. Application program performs various functions on managing and utilizing information in the database; pre- and post- data processing with graphic visualization of output, spatial data interpolation, and prediction of ground behavior using field measuring data. And by providing integrating informations and predictions over entire project area with comprehensible visual displays, the applicability and effectiveness of the developed system for construction management were confirmed.
Applicability of Electrical Conductivity Monitoring Technique for Soil-bentonite Barrier
Oh, Myoung-Hak ; Yoo, Dong-Ju ; Kim, Yong-Sung ; Park, Jun-Boum ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 47~55
In this study, applicability of electrical conductivity monitoring technique for containment barrier such as soil-bentonite wall was evaluated. Laboratory tests including permeability tests and column tests were performed to understand variations in electrical conductivity at different bentonite contents, hydraulic conductivities, and heavy metal concentrations. The electrical conductivity of compacted soil-bentonite mixtures was found to increase proportionally with bentonite content. Accordingly, the hydraulic conductivity of compacted soil-bentonite mixtures which decreases linearly with increasing bentonite content was found to have an inversely proportional relationship with the electrical conductivity. In column tests, electrical conductivity breakthrough curves and concentration breakthrough curves were simultaneously obtained. These results indicated that electrical conductivity measurement can be an effective means of detecting heavy metal transport at the desired locations within barriers and verifying possible contaminant leakage. Experimental results obtained from this study showed that the electrical conductivity measurement can be a promising tool for monitoring of containment barrier.
A Study for Predicting Rotational Cutting Torque from Electrical Energy Required for Ground Drilling
Choi, Chang-Ho ; Cho, Jin-Woo ; Lee, Yong-Soo ; Chung, Ha-Ik ; Park, Yong-Boo ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 57~64
This study proposes a method to estimate drilling torque during ground boring with an aid of electrical energy required for rotating a boring-auger. Ground boring is commonly used in geotechnical engineering such as preboring precast pile installation, soil-cement grouting, ground exploration and so forth. In order to understand the correlation between required electrical energy to rotate the boring auger and the drilling torque, a small laboratory apparatus was designed and a pilot study was performed. The apparatus rotates common drill bits of
in CBR specimens. The velocity of a bit is 19 RPM and predefined using a reduction gear which connects a main rotation axis to a 25 Watts AC electrical motor shaft. In the middle of drilling the motor current increments and the drilling torque were measured and the correlation between the current and the torque was obtained through linear square fits. Based on the correlation the acquired motor current during drilling was applied to predict the drilling torque in consequent testing and the prediction results were compared to the measured torque. The comparison leads a conclusion that the motor current during drilling using electrical power may be a good indicator to estimate/determine strength characteristics of the ground.
Evaluation Model for Lateral Flow on Soft Ground Using Commitee and Probabilistic Neural Network Theory
Kim, Young-Sang ; Joo, No-Ah ; Lee, Jeong-Jae ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 65~76
Recently, there have been many construction projects on soft ground with growth of industry and various construction problems concerning soft soil behavior also have been reported. Especially, foundation piles of abutments and (or) buildings which were constructed on the soft ground have been suffering from a lot of stability problems of inordinary displacement due to lateral flow of soft ground. Although many researches for this phenomena have been carried out, it is still difficult to assess the mechanism of lateral flow on soft ground quantitatively. And reliable design method for judgement of lateral flow occurrence is not established yet. In this study, PNN (probabilistic neural network) and CNN (committee neural network) theories were applied for judgment of lateral flow occurrence based on eat data compiled from Korea and Japan. Predictions of PNN and CNN models for new data which were not used during model development are compared with those predicted by conventional empirical methods. It was found that the developed PNN and CNN models can predict more precise and reliable judgment of lateral flow occurrence than conventional empirical methods.
Installation Damage Assessment of Geogrids by Laboratory Tester
Jeon, Han-Yong ; Jin, Yong-Bum ; Jang, Yeon-Soo ; Yoo, Chung-Sik ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 77~86
Installation damage of 3 types of geogrids was evaluated with compaction condition by laboratory tester. This experimental was in accordance with ENV ISO 10722-1. First, soil distribution and water content were conducted. And then we changed cyclic loading time and type of geogrids as a factor of installation damage. The samples are woven, warp-knitted, welded type of 6, 8, 10T. This study aims to give an insight into the relationships between installation damage and cyclic loading time. The result of studies was that strength of the damaged geogrids can be closely correlated with the time of loading cycles. Especially, welded type shows slower slope than two types of geogrids due to coating materials. That means welded type is coated with PP (Polypropylene), but the other two types of geogrids are coated with PVC (Polyvinyl Chloride). To confirm another factor different method was performed. The size of soil was used between 9.5 mm and 23.5 m to compare initial experimental. Cyclic loading compaction is taken 200 times before installation test and the reason is that the reduction factor of this case by installation damage was higher than other compaction loading conditions.
Evaluation of Undrained Shear Strength of Busan New-port Clay by DMT
Hong, Sung-Jin ; Shin, Dong-Hyun ; Kim, Dong-Hee ; Jung, Sang-Jin ; Lee, Woo-Jin ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 87~98
A series of dilatometer test, field vane test, and
triaxial test were performed for clayey soils of Busan new port site to develop the relationships between undrained shear strength and the DMT results. Normalized undrained shear strength is turned out to be
triaxial test and
for vane shear test. By comparing the undrained shear strength estimated from DMT indices with the results measured by in-situ vane test or
triaxial test, two methods to predict the undrained shear strength from DMT results are suggested. One is based on the relationship between
and horizontal stress index (KD) while another method comes from
correlation. It was observed that the method based on
relation shows slightly better accuracy than the one based on
although all of the methods suggested in this study provided comparable values of predicted undrained shear strength. Since the definitions of
, in which soil condition is reflected, it is believed that the prediction method using
is capable of taking a material type into consideration.
Strength of Improved Soil on the Work-conditions of Deep Mixing Method
Lee, Kwang-Yeol ; Yoon, Sung-Tai ; Kim, Sung-Moo ; Han, Woo-Sun ;
Journal of the Korean Geotechnical Society, volume 23, issue 7, 2007, Pages 99~104
The deep soil mixing, on ground modification technique, has been used for many diverse applications including building and bridge foundations, port and harbor foundations, retaining structures, liquefaction mitigation, temporary support of excavation and water control. This method has the basic objective of finding the most efficient and economical method for mixing cement with soil to secure settlements through improvement of stability on soft ground. In this research, the experiments were conducted on a laboratory scale with the various test conditions of mixing method; the angle of mixing wing, mixing speed. Strength and shapes of improved soil of these test conditions of deep mixing method were analysed. From the study, it was found that the mixing conditions affect remarkably to the strength and shapes of improved soils.