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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 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
A Study of Field Test on Bearing Capacity Increase Effect of Single Stone Column
Choi, Yong-Kyu ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 5~11
Among soft ground improvement methods by using granular material, the sand compaction pile method has been widely utilized in Korea, but, as a result of shortage and increase of unit price of sand, a necessity of an alternative method has been required. In this study, a series of in-situ static load tests for crushed-stone compaction piles were performed. Pile diameter was fixed to 700mm and areas of loading plates were changed. The static load tests were performed for area replacement ratios of 20, 30 and 40% respectively. Based on the test results, bearing capacity of single crushed-stone compaction pile was estimated. It showed that the settlement decreases as the replacement ratio increases. Also, a yielding capacity equation of the crushed-stone compaction pile considering replacement ratio was suggested.
Estimation of Degree of Weathering in Residual Soil Using Water Content from Fall Cone Test Result
Son, Young-Hwan ; Chang, Pyoung-Wuck ; Kim, Seong-Pil ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 13~23
Weathered soils appear from the rock and its weathering result. In accordance with the degree of weathering the roch may become soft rock, weathered rock and residual soil. In general, classification method for determining the degree of weathering are performed by chemical method and N-value. But these method have some problems. So, this research is to suggest an appropriate physical method to determine the degree of weathering of weathered soils. A new classification method for determining the degree of weathering is suggested, based upon the results from fall cone test. According to the proposed physical method using fall cone apparatus, the measured values of the samples from the same area show distinctive difference of weathering. For the checking, we selected two areas. As a result, the relationship between CWI and water content according to penetration is expressed as an equation in Ilsan and Incheon area. And it proved to be a good method to determine the degree of weathering.
Characterization of Durability and Deterioration Eroded by Chemical Attack on the Concrete Lining in Conventional Tunnel
Kim, Dong-Gyou ; Lee, Seung-Tae ; Jung, Ho-Seop ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 25~32
This study is to evaluate the effect of chemical attack on durability and deterioration of lining concrete in tunnel. Surface examination, nondestructive inspection, uniaxial compressive strength test, carbonation test, chloride diffusion test, micro-structural analysis were performed to analyze the deterioration of lining concrete in tunnel constructed 70 years ago. From surface examination results, the tunnel had been repaired and reinforced in several times. It has many cracks, water-leakage, efflorescence and exploitation. Compressive strengths obtained from nondestructive inspection and uniaxial compressive strength test have measured
, respectively. Carbonation depth specimen cored from concrete lining has ranged from 3mm to 27mm. From chloride diffusion test, most specimens have low permeability. And the XRD analysis was able to detect ettringite and thaumasite, which were confirmed by SEM and EDS results to be the causes for the deterioration of lining concrete.
Blade Type Field Vs Probe for Evaluation of Soft Soils
Yoon, Hyung-Koo ; Lee, Chang-Ho ; Eom, Yong-Hun ; Lee, Jong-Sub ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 33~42
The assessment of shear wave velocity(
) in soft soils is extremely difficult due to the soil disturbances during sampling and field access. After a ring type field
probe(FVP) has been developed, it has been applied at the southern coastal area of the Korean peninsular. This study presents the upgraded FVP "blade type FVP", which minimizes soil disturbance during penetration. Design concerns of the blade type FVP include the tip shape, soil disturbance, transducers, protection of the cables, and the electromagnetic coupling between transducers and cables. The cross-talking between cables is removed by grouping and extra grounding of the cables. The shear wave velocity of the FVP is simply calculated by using the travel distance and the first arrival time. The large calibration chamber tests are carried out to investigate the disturbance effect due to the penetration of FVP blade and the validity of the shear waves measured by the FVP. The blade type FVP is tested in soils up to 30m in depth. The shear wave velocity is measured every 10cm. This study suggests that the upgraded blade type FVP may be an effective device for measuring the shear wave velocity with minimized soil disturbance in the field.
Creep Deformation Characteristics of Weathered Granite Soil
Park, Heung-Gyu ; Kim, Yong-Ha ; Paeng, Woo-Seon ; Lee, Hae-Soo ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 43~52
This study analyzes the characteristics of creep deformation behavior of weathered granite soils used in road embankments. The creep strain under the unconfined compressive state demonstrated an excellent agreement with the theoretical analysis of the burgers substance. The elastic deformation showed a termination in its characteristics after a long-term period owing to the increase in applied loads. The primary creep strain was 0.0028 and concluded that the deformation completed within
days after applying the loads. Also, the completing time of creep deformation in the embankment soils increased in proportion to the height of embankment soils. The secondary creep strain is about 50% of the primary creep strain.
Predicting Method of Penetration Rate of Sheet Pile Using Cone Penetration Test Result
Lee, Seung-Hyun ; Lim, Nam-Gyu ; Kim, Byoung-Il ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 53~60
A program for predicting rate of penetration of sheet pile using cone penetration test results was developed. Especially, energy consumption occurring from lateral vibration of sheet pile was estimated quantitatively in order to overcome overprediction of rate of penetration for shallow depths of pile installation. Penetration rates of pile calculated from developed program were compared with those of field test. Predicted rates of pile penetration for the depths to 12m were
of the measured values. As pile penetration depth decreases, the difference between the predicted rate of penetration and the measured rate of penetration decreases.
Reliability Estimation of Static Design Methods for Driven Steel Pipe Piles in Korea
Huh, Jung-Won ; Park, Jae-Hyun ; Kim, Kyung-Jun ; Lee, Ju-Hyung ; Kwak, Ki-Seok ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 61~73
As a part of Load and Resistance Factor Design(LRFD) code development in Korea, in this paper an intensive reliability analysis was performed to evaluate reliability levels of the two static bearing capacity methods for driven steel pipe piles adopted in Korean Standards for Structure Foundations by the representative reliability methods of First Order Reliability Method(FORM) and Monte Carlo Simulation(MCS). The resistance bias factors for the two static design methods were evaluated by comparing the representative measured bearing capacities with the design values. In determination of the representative bearing capacities of driven steel pipe piles, the 58 data sets of static load tests and soil property tests were collected and analyzed. The static bearing capacity formula and the Meyerhof method using N values were applied to the calculation of the expected design bearing capacity of the piles. The two representative reliability methods(FORM, MCS) based computer programs were developed to facilitate the reliability analysis in this study. Mean Value First Order Second Moment(MVFOSM) approach that provides a simple closed-form solution and two advanced methods of FORM and MCS were used to conduct the intensive reliability analysis using the resistance bias factor statistics obtained, and the results were then compared. In addition, a parametric study was conducted to identify the sensibility and the influence of the random variables on the reliability analysis under consideration.
Analysis of Influencing Factors on Strength Characteristics of Cemented Sand
Lee, Moon-Joo ; Choi, Sung-Kun ; Choo, Hyun-Wook ; Cho, Yong-Soon ; Lee, Woo-Jin ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 75~82
The effects of sitting pressure(
) during cementation, relative density and particle characteristics on the cohesion intercept due to cementation bonds and the confining stress inducing the breakage of cementation bonds
are investigated from drained shear tests on the cemented sands confined under the isotropic stress up to 400 kPa. It was observed from the experimental results that the cemented sands, with the same density and gypsum content, show similar values of cohesion intercept and
, regardless of
. Although the cohesion intercept and
of cemented sands are observed to increase with increasing relative density and cementation level, the relative density appears to have more significant effect on
than the cohesion intercept does. From analysing the test results of three different sands, it is shown that the smaller the particle size the larger the cohesion intercept and
, due to the increased number of contact points between the particles.
A Practical Analysis Method for the Design of Piled Raft Foundations
Lee, Seung-Hoon ; Park, Young-Ho ; Song, Myung-Jun ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 83~94
Piled raft foundations have been highlighted as an economical design concept of pile foundations in recent years. However, piled raft foundations have not been widely used in Korea due to the difficulty in estimating the complex interaction effects among rafts, piles and soils. The authors developed an effective numerical program to analyze the behavior of piled raft foundations for practical design purposes and presented it briefly in this paper. The developed numerical program simulates the raft as a flexible plate consisting of finite elements with eight nodes and the raft is supported by a series of elastic springs representing subsoils and piles. This study imported another model to simulate pile groups considering non-linear behavior and interaction effects. The apparent stiffnesses of the soils and piles were estimated by iterative calculations to satisfy the compatibility between those two components and the behavior of piled raft foundations can be predicted using these stiffnesses. For the verification of the program, the analysis results about some example problems were compared with those of rigorous three dimensional finite element analysis and other approximate analysis methods. It was found that the program can analyze non-linear behaviors and interaction effects efficiently in multi-layered soils and has sufficient capabilities for application to practical analysis and design of piled raft foundations.
Effect of Disturbance on the Compressibility Characteristics of Marine Clay
Yu, Sung-Jin ; Chae, Young-Su ; Kim, Jong-Kook ; Yoon, Won-Sub ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 95~107
This study describes compressive characteristics of marine clay at southwestern coast in Korea by large block and piston samples. Through the analysis of disturbance effect and various consolidation test, consolidation result shows that volumetric strain from large block samples is lower than piston samples and compression index of large block samples is larger than piston samples value. We suggest new empirical equation of compression index by the effect of compression index following sampling method. If consolidation settlement is presumed using empirical equation of compression index, the resort will be more reasonable in predicting settlement than that obtained by the decision of compressibility characteristics from piston samples.
Analysis of Digital Vision Measurement Resolution by Influence Parameters
Kim, Kwang-Yeom ; Kim, Chang-Yong ; Lee, Seung-Do ; Lee, Chung-In ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 109~116
This study has reviewed the applicability of displacement measurement by using a digital vision technique based on typical photogrammetric methods. In this study, a series of experimental measurements have been performed in order to improve the accuracy of digital vision measurement by establishing criteria of factors of various vision measurements. It is found that the digital vision measurement tends to show higher accuracy as the image size(resolution) and the focal length become larger and the distance to an object becomes closer. It is also observed that measurement error decreases with processing as many images as possible in various angles. Applicability on high-resolution displacement measurement is proved by applying the digital vision measurement developed in this study to a large scale loading test of concrete lining.
EFFECT OF COMPLIANCE ON NEWMARK-TYPE RIGID BLOCK DEFORMATION ANALYSIS
Kim, Jin-Man ;
Journal of the Korean Geotechnical Society, volume 23, issue 12, 2007, Pages 117~124
This study investigates the effect of spatial averaging and compliance taken account of in the analysis of earthquake-induced permanent deformation of slopes. At present, the rigid block analysis originally proposed by Newmark is widely used in the deformation analysis, mainly because of its computational efficiency. This type of approach, however, adopts the so-called decoupled approach, in which seismic response and deformation analyses are carried out separately. Original Newmark block analysis assumes the potential sliding mass to be noncompliant, and has been criticized to be potentially unconservative. This paper reviews the impact of the noncompliance assumption of the potential sliding mass in the Newmark-type analysis. The gross effects of earthquake shaking on the potential sliding mass are estimated by spatial averaging method and analyzed in frequency domain. The results indicate that there is a simple criterion that can be used to determine the level of compliance of the potential sliding mass.