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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Geotechnical Society
Journal Basic Information
Journal DOI :
Korean Geotechical Society
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Volume & Issues
Volume 24, Issue 12 - Dec 2008
Volume 24, Issue 11 - Nov 2008
Volume 24, Issue 10 - Oct 2008
Volume 24, Issue 9 - Sep 2008
Volume 24, Issue 8 - Aug 2008
Volume 24, Issue 7 - Jul 2008
Volume 24, Issue 6 - Jun 2008
Volume 24, Issue 5 - May 2008
Volume 24, Issue 4 - Apr 2008
Volume 24, Issue 3 - Mar 2008
Volume 24, Issue 2 - Feb 2008
Volume 24, Issue 1 - Jan 2008
Selecting the target year
A Study on Utilization of Recycled Aggregates as Lateral Drain for Soft Ground Improvemnet
Lee, Jong-Yoon ; Chun, Hae-Pyo ; Jeong, Woo-Chul ; Lim, Hae-Sic ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 5~15
The purpose of this study is to examine the validity of recycled aggregates (RAs) as a substitute for Sand-Mat material for soft ground improvement in the housing site development. To evaluate the possibility of RAs as a substitute for sand mat material, first of all, the criteria and regulations related with the quality of lateral drain layer were collected and checked. Secondly, both of the properties of RAs were compared with the properties of natural sand for the lateral drain layer. The material properties related to coefficient of permeability, pressure at-rest state and so on satisfied most standards. On the basis of the test results, RAs were used to the construction site as lateral drain layer. Accordingly, if the quality of RAs can be managed well, the application of these RAs as lateral drain layer to replace natural sand was highly effective. Also, based on cost analysis of two materials, RAs are proved to be very competitive.
Development of Analytical Method of Piled-Raft Foundation Considering Nonlinear Behavior of Pile
Park, Hyun-Il ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 17~24
In this study, two-dimensional finite element method has been developed to simply consider the nonlinear load-settlement behavior of piled raft foundation subjected to vertical loads. The raft is modeled as the plate finite element based on Mindline's theory and the pile is modeled as the proposed simple pile model that is easy to consider the complex nonlinear load-settlement behavior between pile and soil. The developed numerical method has been compared with the settlement data of lab-scaled experiment and numerical solutions to verify that the developed numerical method shows satisfactory prediction for the nonlinear load-settlement of piled raft foundation.
Turbidity Calibration of Borehole Roughness Measurement System (BKS-LRPS) Usable in Water
Park, Bong-Geun ; Choi, Yong-Kyu ; Kim, Myung-Hak ; Kwon, Oh-Kyun ; Nam, Moon-S. ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 25~32
Based on recent studies, the side resistance of rock socketed drilled shafts was affected by unconfined compressive strength of rock, socket roughness, rock types and joints, and initial normal stress. Especially, the socket roughness was affected by rock types and joints, drilling methods, and diameters of pile. In this study, a new roughness measurement system (BKS-LRPS, Backyoung-KyungSung Laser Roughness Profiling System) usable in water was developed. Based on the laboratory model tests, an EMD (Effective Measurement Distances) according to various turbidity was proposed as
Study on Comparison of Methods for Estimation of Shear Wave Velocity in Core Zone of Existing Dam
Ha, Ik-Soo ; Oh, Byung-Hyun ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 33~43
In this study, for the purpose of evaluating the shear wave velocity in core zone, cross-hole test, down-hole test, MASW (Multi-channel Analysis of Surface Wave), and seismic reflection survey were carried out on the crest of the existing 'Y' dam. The results of field tests were compared one another. Furthermore, the field test results were compared with the result by the Sawada's empirical recommendation method. The purpose of this study is to compare the results of four kinds of field tests for evaluation of shear wave velocity in core zone of existing dam, to verify applicability of the empirical method which was recommended by Sawada and Takahashi, and to recommend a reasonable method for evaluation of shear wave velocity which is needed to evaluate tile maximum shear modulus of core zone. From the results of four kinds of field tests such as cross-hole test, down-hole test, MASW, and seismic reflection survey, it was found that the shear wave velocity distributions were similar within 18 m in depth and the results obtained by MASW and seismic reflection survey were almost the same by 30 m in depth. For evaluation of shear wave velocity in core zone of the existing dam, in consideration that it is not easy to bore the hole ill the core zone of existing dam, surface surveys such as MASW and seismic reflection method are recommended as realistic methods. On condition that it is impossible to conduct the field test and it is preliminary investigation, it is recommended that Sawada's low bound empirical equation be used.
A Study on Consolidation Characteristic of Dredged Fill Using Geotechnical Centrifuge
Kim, Hee-Chul ; Kim, Heung-Seok ; Lee, Song ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 45~55
In this study, the in-situ model test has been conducted to estimate and analyze consolidation behavior of the ground by using the miniature test that reconstructs economically geotechnical behavior of in-situ full scale structure. To analyze the relation of effective stress, void ratio and coefficient of permeability at the self-weight consolidation stage, the low stress seepage consolidation test has been conducted and the involution function of constitutive equation had been obtained from the result of the curve fitted seepage consolidation test. As a result of the numerical analysis that had been conducted on the representative section using a constitute equation, final settlement was similar to those of self-weight consolidation of the centrifugal model test. But it was more or less smaller. It seems that these trends are caused by the difference between estimated values.
New Soil Classification System Using Cone Penetration Test
Kim, Chan-Hong ; Im, Jong-Chul ; Kim, Young-Sang ; Joo, No-Ah ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 57~70
The advantage of piezocone penetration test is a guarantee of continuous data, which is a source of reliable interpretation of target soil layer. Many researches have been carried out f3r several decades and several classification charts have been developed to classify in-situ soil from the cone penetration test result. Since most present classification charts or methods were developed based on the data which were compiled over the world except Korea, they should be verified to be feasible for Korean soil. Furthermore, sometimes their charts provide different soil classification results according to the different input parameters. However, unfortunately, revision of those charts is quite difficult or almost impossible. In this research a new soil classification model is proposed by using fuzzy C-mean clustering and neuro-fuzzy theory based on the 5371 CPT results and soil logging results compiled from 17 local sites around Korea. Proposed neuro-fuzzy soil classification model was verified by comparing the classification results f3r new data, which were not used during learning process of neuro-fuzzy model, with real soil log. Efficiency of proposed neuro-fuzzy model was compared with other soft computing classification models and Robertson method for new data.
Reduction of Differential Settlements due to Deep Excavation Using the Micro-piling Method
Huh, In-Goo ; Hwang, Tae-Hyun ; Lee, Sang-Ryeong ; Shin, Jong-Ho ; Kwon, Oh-Yeob ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 71~81
Wall displacements caused by earth pressure, rainfalls, rise in ground water level, inappropriate deep excavation and structural defects of the wall may produce differential settlements to existing buildings, which often result in damages and/or collapses of the building structures. In this case, measures to protect the walls and nearby structures would be required. One of the recent measures to reduce differential settlements and protecting walls is to reinforce the ground using micro-piles. In this study physical model tests were carried out to evaluate the performance of the micro-pile method. It is revealed that reduction of the settlement was maximized when the length of micro-pile is twice of the foundation width, distance between piles is twice of the pile diameter and the distance to wall is one tenth of the foundation width. Based on the test results some design recommendations were made.
Prediction Method of Settlement Based on Field Monitoring Data for Soft Ground Under Preloading Improvement with Ramp Loading
Woo, Sang-Inn ; Yune, Chan-Young ; Baek, Seung-Kyung ; Chung, Choong-Ki ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 83~91
Previous settlement prediction methods based on settlement monitoring were developed under instantaneous loading condition and have restriction to be applied to soft ground under ramp loading condition. In this study, settlement prediction method under ramp loading was developed. New settlement prediction method under ramp loading considered influence factors of consolidation settlement such as thickness of clayed layer, quantity of surcharge load and preconsolidation pressure, etc. Geometrical correction method based on hyperbolic method (1991) and correction method based on probability theory were applied to increase accuracy of settlement prediction using field monitoring data after ramp loading. Large consolidation tests for ideally controlled one dimensional consolidation under ramp loading condition were performed and the settlement behavior was predicted based on the monitoring data. New prediction method yielded good result of entire settlement behavior by using data during an early stage of ramp load. Additionally, new prediction method offered better settlement prediction which had final settlement prediction in close proximity and low RMSE(Root Mean Square Error) than previous method such as hyperbolic method did.
Numerical Analysis on the Behaviors of the Breakwater Utilizing Buoyancy for Soft Ground
Yun, Hee-Suk ; Jang, In-Sung ; Kwon, O-Soon ; Lee, Sun-Jae ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 93~103
For conventional gravity type offshore structures constructed on the soft ground, which is located on the western and/or southern Korea, the excessive consolidation settlements are caused by the self-weight of the structures and so additional ground treatment methods are generally needed. Several types of improved foundation systems utilizing buoyancy applicable to even the soft ground were introduced for economical and efficient design of the offshore structure. In this study, a series of numerical simulations on the consolidation and lateral behaviors of breakwaters with the improved foundation systems utilizing buoyancy were carried out. From the results of numerical simulations it is found that the foundation systems utilizing buoyancy are efficient for reducing the maximum consolidation settlements without reducing lateral safety.
Seepage Characteristics of Domestic Bed Sediments Mixed with Good-quality Soil as Levee Fill Material
Choi, Bong-Hyuck ; Kim, Kyung-Min ; Kim, Jin-Man ; Lee, Dae-Yeong ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 105~111
To improve the stability of levee structure, it is required to use good quality fill materials, intensive management, appropriate hydraulic structure and construction of cut-off wall. In particular, the most important factor of levee construction technology is to use bed sediment for its safety. In this study, seepage model test and numerical analysis were performed based on a standard section of levee recommended in the river design standard of korea (2005). The results of test and analysis show that most of the bed soil is a sand (SP in USCS), which does not satisfy the permeability criteria for levee materials (
), thus for the safety of levee it is required to adopt a stabilizing method such as good quality soil mixing, water content control.
Field Compaction Characteristics of Domestic Bed Sediment as Levee Fill Material
Kim, Jin-Man ; Kim, Kyung-Min ; Choi, Bong-Hyuck ; Lee, Dae-Yeong ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 113~120
It is difficult to acquire good-quality fill material for levee in field and it is the most important factor of levee construction technology to use the bed sediment for the safe and economic construction. So, it is necessary to evaluate geotechnical characteristics of bed sediment, design and construction method through field application tests. In this study geotechnical characteristics of Hyunpoong bed sediment (SP) in Daegu were analyzed, and laboratory/field compaction test for mixing granite weathered soil (SW) was performed. And field mixing method was suggested.
The Behavior of In-situ Top Base foundation in Granular Soil
Kim, Hak-Moon ; Kim, Chan-Kuk ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 121~129
Numerical analysis for the in-situ top base foundation (In-situ TBF) was carried out in order to investigate the effect of bearing capacity and the load delivering mechanisms in granular soil. The input data for the numerical model was prepared from the result obtained from the plate load test and full size in-situ TBF field tests. According to the result of numerical analysis, the behavior of in-situ TBF showed that bearing capacity of the foundation increased by
and settlement was reduced up to
comparing to other types foundation. The effect of cone-shaped part of the in-situ TBF was as important as pile part for the improvement of foundation stability. The variation of the length of pile part indicated that the present length was proved satisfactory in terms of effectiveness.
Predicting Uniaxial Compressive Strength and Elastic Modulus Using Brazilian Test
Min, Tuk-Ki ; Moon, Jong-Kyu ; Ro, Jai-Sool ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 131~146
Many attempts have been made to determine the uniaxial compressive strength and elastic modulus of regular specimens of rock indirectly. But little experimental work has been done to find above two parameters using Brazilian test value up to date. This paper employs Brazilian test value to estimate uniaxial compressive strength and elastic modulus of sedimentary (sand stone, shale) and metamorphic (gneiss) rocks. High reliability of Brazilian test has been supported by the established conclusions drawn from point load test and Schmidt hammer strike values. It has also been found that this method can be applied easily and rapidly to the estimation of uniaxial compressive strength and elastic modulus of rock cores when direct tests are not available.
Uplift Capacity for Bond Type Anchored Foundations in Rock Masses
Kim, Dae-Hong ; Lee, Yong-Hee ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 147~160
This paper presents the results of full-scale loading tests performed on 54 passive anchors and 4 group anchored footings grouted to various lengths at several sites in Korea. The test results, the failure mechanisms as well as uplift capacities of rock anchors depend mostly on rock type and quality, embedded fixed length, properties of the discontinuities, and the strength of rebar. Anchors in poor quality rocks generally fail along the grout/rock interfaces when their depths are very shallow (a fixed length of less than 1 m). However, even in such poor rocks, we can induce a more favorable mode of rock pull-up failure by increasing the fixed length of the anchors. On the other hand, anchors in good quality rocks show rock pull-up failures with high uplift resistance even when they are embedded at a shallow depth. Laboratory test results revealed that a form of progressive failure usually occurs starting near the upper surface of the grout, and then progresses downward. The ultimate tendon-grout bond strength was measured from
of unconfined compressive strength of grout. One of the important findings from these tests is that the measured strains along the corrosion protection sheath were so small that practically the reduction of bond strength by the presence of sheath would be negligible. Based on test results, the main parameters governing the uplift capacity of the rock anchor system were determined. By evaluation of the ultimate uplift capacity of anchor foundations in a wide range of in situ rock masses, rock classification suitable for a transmission tower foundation was developed. Finally, a very simple and economical design procedure is proposed for rock anchor foundations subjected to uplift tensile loads.
Investigation of S-wave Velocity Based on SPS Field Tests
Jeong, Nam-Hoon ; Lee, Chong-Kyu ;
Journal of the Korean Geotechnical Society, volume 24, issue 10, 2008, Pages 161~174
To investigate the characteristics of the shear wave velocity of cohesive soils and residual soils in Korea, Standard Penetration Test (SPT), Suspension PS Logging tests (SPS) and other soil tests were performed to analyze the shear wave velocity at each layer For these purposes, 2 study sites are selected: one is cohesive soils and the other is residual soils. As a results, new empirical formulas are proposed from the relationship between strength of the ground (N value) and shear wave velocity from the test data at each layer. In the case of cohesive soils, the proposed relationships are nearly similar to empirical formulas, however, in the case of residual soils there was a little difference between the empirical formulas and measured velocities in this study. Case examples for shear wave velocites are presented with depth, N-values and compared with Ohta et al. (1978) empirical formula.