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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 27, Issue 6D - Nov 2007
Volume 27, Issue 6C - Nov 2007
Volume 27, Issue 6B - Nov 2007
Volume 27, Issue 6A - Nov 2007
Volume 27, Issue 5D - Sep 2007
Volume 27, Issue 5C - Sep 2007
Volume 27, Issue 5B - Sep 2007
Volume 27, Issue 5A - Sep 2007
Volume 27, Issue 4D - Jul 2007
Volume 27, Issue 4C - Jul 2007
Volume 27, Issue 4B - Jul 2007
Volume 27, Issue 4A - Jul 2007
Volume 27, Issue 3D - May 2007
Volume 27, Issue 3C - May 2007
Volume 27, Issue 3B - May 2007
Volume 27, Issue 3A - May 2007
Volume 27, Issue 2C - Mar 2007
Volume 27, Issue 2A - Mar 2007
Volume 27, Issue 2D - Mar 2007
Volume 27, Issue 2B - Mar 2007
Volume 27, Issue 1D - Jan 2007
Volume 27, Issue 1C - Jan 2007
Volume 27, Issue 1B - Jan 2007
Volume 27, Issue 1A - Jan 2007
Selecting the target year
Evaluation of CPT-based Pile Load Capacity Estimation and Reliability Analysis
Kim, Ji-Hwan ; Kim, Min-Kee ; Lee, Jun-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 1~9
Since CPT was developed in 1910, it has been one of the most popular methods for geotechnical site characterization. In this study, estimation methods of pile bearing capacity using CPT results are investigated and analyzed for establish more effective and reliable foundation design system. Results of pile load tests and CPT, which were carried out in the same region, are collected and analyzed according to region and types of pile. Analyzing and comparing with loading test results, reliable CPT-based pile design methods for different load-settlement criteria are investigated. Based on pile load test and CPT results, reliability analysis for each method considered in this study also performed and adopted to evaluate reliability of methods for field application.
Comparision and Investigation of Field Test and Structural Analysis for Innovative Prestressed Support (IPS) System
Han, Man-Yop ; Jin, Kyung-Seok ; Kang, Sang-Hoon ; Kim, Sung-Bo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 11~20
A full scale test at the excavation site of weak soil has been performed and the results are compared with the structural analysis of the IPS system. The field test site is located in north-Busan and the size of excavation plane is 52m?34m?20m. The 6 layers of IPS system are consisted with single IPS wale (11m~18m), middle-strut (26.9m, 19.85m) and corner-strut. The conventional strut method is hard to apply to this site because the soil condition is mostly weak clay layers and the maximum earth pressure reaches 39.6t/m. In this study, lots of measurements sencors are placed the comparison and investigation of field test for soil condition, structural analysis and structural behavior of IPS system are performed and it is suggest how to reduce deviation between field test and structural analysis.
A Study on Regarding the Measuring Plan of the Jointmeter and Perimetric Jointmeter for the CFRD (Concrete Face Rockfill Dam) Conduct Prediction
Lee, Seung-Ho ; Park, Won-Chan ; Park, Choul-Suk ; Noh, Heung-Jae ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 21~28
The establishment of measurements for estimate behavior of dam system have many problems becasuse of kind of a measuring instrument and selection of measurement point. The Jointmeter can grasp the transformation at the shrinkage joint section of dam. The Perimetric Jointmeter subdivide transformation by outside force and it can prospect transformation from zone to other zone. Actually, we applied Jointmeter and Perimetric Joint in the dam. As a result, we can grasp the general transformation and rational methods of establishment and application of them. Therefore, in this paper suggested method for rational establishment and measurement.
Soils Reinforced with Fibrillated Polypropylene Fiber I: Strength Characteristics
Kim, Nak-Kyung ; Park, Jong-Sik ; Joo, Yong-Sun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 29~36
The strength characteristics of soils reinforced with Fibrillated Polypropylene Fiber(FPF) were investigated in this study. In order to evaluate the strength of FPF reinforced soils, laboratory tests such as direct shear test, uniaxial compression test, and California Bearing Ratio(CBR) test were performed. The results of tests evidently showed that the strength of FPF reinforcements was increased. The effects of various soil-FPF parameters such as fiber lengths and contents and soil types were examined for the strength of FPF reinforced soils. The best mixture condition of soil-FPF composites was proposed for the improvement of the strength of FPF reinforced soils. The findings of this study are related to the reinforcements for the improvement of the stability of soil slopes and the bearing capacity of foundations.
Soils Reinforced with Fibrillated Polypropylene Fiber II : Applications
Kim, Nak-Kyung ; Park, Jong-Sik ; Kim, Sung-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 37~43
This paper presents a load settlement behavior obtained from load tests executed on a thick homogeneous stratum of compacted sandy soils reinforced with Fibrillated Polypropylene Fibers (FPF). Model and field plate load tests and model slope tests for the artificial FPF-reinforced soil layers were performed to investigate the FPF reinforcement. Based on the previous laboratory tests for FPF-reinforced soils, these load tests were carried out under the best mixture condition of FPF. The results of the load tests showed that the FPF reinforcement increased the peak strength and conducted a load settlement hardening behavior at very large strains. The increase in ultimate load at axial strains as large as 10%, from the model plate load test could be as much as approximately 26% at a fiber content of 0.5% by weight of dry soil and at a fiber length of 5cm. In the same mixture condition of reinforcement, the ultimate load obtained from the field plate load test was approximately 21% larger than those of soil layers without FPF. The behavior of FPF-reinforced slopes with angles of 35?and 45?was observed compared to those of non-reinforced sandy slopes. The ultimate load increased approximately 47% for FPF-reinforced slope with angle of 35?and increased approximately 90% for FPF slope with angle of 45?
Deformation Characteristics of Quick-set Flowable Backfill Materials Using Excavated Soil for Underground Power Cables
Kim, Tae-Sik ; Lee, Dae-Soo ; Kim, Dae-Hong ; Jeong, Sang-Seom ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 45~53
Flowable backfill is known as soil-cement slurry, void fill, and controlled low-strength material (CLSM). The benefits of CLSM are reduced equipment costs, faster construction, re-excavation in the future, and the ability to place materials in confined spaces, which are narrow parts or perimeters of underground power cables nearly impossible for compaction. This study is not only to evaluate the physical and mechanical characteristics of flowable backfill materials based on soil types for constructing underground power utilities but also find How large the vertical deformation is occurred out. After 3 types of the flowable slurry mixtures are chosen among the 14 mixtures according to their physical characteristics, The FEM analysis is carried out with 3 types of mixture chosen and then the result of FEM analysis is compared with the result of the field test. It is found that the flowable backfill materials are satisfied with the allowable value and less deformation of soil and PE-pipe than a sand backfill material.
Development of 4-node EAS Element and Application to Geotechnical Problems
Kim, Ki-Du ; Ahan, Sang-Ro ; Yoon, Tae-Gook ; Shin, Jong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 55~60
Finite element formulation based ob Enhanced Assumed Strain (EAS) plane element (XPLANE) is formulated and applied to elasto-plastic geotechnical problems. It is identified that the EAS approach is excellent in removing the locking problem which is dominant for the conventional 4-node plane strain elements. The 4-node EAS element with 7 enhanced strain terms and full integration gives almost the same performance with the conventional 8-node plane element which requires large calculation effort and memory capacity. Benchmark tests and sample analyses show that the new element can reduce hardware resources required and be applied to large deformation geotechnical problems with reduced efforts. Analyses for 3 geotechnical problems indicated that the 4-node EAS element has almost same accuracy and better computational efficiency comparing to the conventional 8-node plane strain element.
Application of Distinct Particle Modelling to Evaluate Geotechnical Parameters
Koo, Ja-Kap ; Jeon, Je-Sung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 61~68
In this research, numerical simulations using distinct element method have been conducted with laboratory tests including triaxial tests for coarse grained materials. For simulations of distinct element method, modeling of grain size distribution from 0.1mm to 50mm has been conducted by clump logic. The effects of initial porosity (no=0.11, 0.14, 0.17, 0.20), up-scaling (SR=1.0, 5.0, 10.0, 20.0) for particle size and micro parameters such as ball stiffness, stiffness ration and friction coefficient have been investigated to confirm the applicability of this method to geotechnical problems. These numerical results show that distinct particle modelling should be a valuable method to predict geotechnical considerations of in-situ condition from laboratory test results. With micro parameters which are chosen by calibration process, discrete particle modelling of triaxial tests in case of other confining stress and cyclic loading condition were available.
Analysis of Load Transfer Curves on Drilled Shaft Using In-situ bi-directional Loading Test
Lim, Jong-Seok ; Ha, Hyuk ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 69~77
As the structures become larger and the environmental criterions become strict, the constructions of drilled shaft are increasing. So, the reasonable method for estimating bearing capacity of drilled shaft is needed. For the development of the method, in this study, the load transfer function method which is one of the settlement analysis of pile is selected and the load transfer curves using in this method are investigated. The load tests on 6 drilled shafts are executed and various load transfer curves are acquired from the tests. These curves are classified by soil types and the shapes of the curves are analyzed for the development of load transfer functions. And the comparisons of theoretical values and in-situ test values are executed for the determination of maximum bearing capacity. From the results of the study, the load transfer function for each soil type is developed and, for the estimation of maximum skin frictions, it is founded that the values predicted from the methods of Meyerhof (1976) and Reese and Wright (1977) for weathered soils, Meyerhof (1976) for weathered rocks are similar to in-situ test values.
Evaluation of a Long Term Durability of Shotcrete Mixed Micro-Silica Fume using Combined Deterioration Test
Ma, Sang-Joon ; Kim, Dong-Min ; Choi, Jae-Seok ; Kim, Jae-Shin ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 79~85
A long-term durability of shotcrete in tunnel is affected by a variety of deterioration factors such as dry-wet repetition by underground water, freezing-thawing by diurnal range, carbonation by atmospheric environment. etc. Therefore it is necessary to investigate deterioration characteristics considering combined environmental conditions in order to secure a long-term safety of shotcrete. In this study, a combined deterioration test was carried out, including deterioration factors such as dry-wet repetition, freezing-thawing and carbonation. Fly ash produced as by-product and micro-silica fume used to improve strength and durability in overseas were applied to combined deterioration test as additions. As a result of test, shotcrete mixed micro-silica fume showed a good resistance to deterioration in comparison with the others, and it was effective to improve a long-term durability of shotcrete by means of decreasing a deterioration process caused by steel fiber.
A Parametric Study of Rock Properties and Mechanical Cutting Conditions for Deriving an Optimum Design Model of a TBM Cutterhead Equipped With Disc Cutters
Chang, Soo-Ho ; Choi, Soon-Wook ; Bae, Gyu-Jin ; Jeon, Seok-Won ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 1C, 2007, Pages 87~98
This study aimed to examine the effects of rock properties and mechanical cutting conditions on the cutting performance of a TBM disc cutter by carrying out a series of linear cutting tests for eight different kinds of rock conditions. Here the mechanical cutting conditions included cutter spacing and cutter penetration depth. In addition, by measuring rock properties related to drillability indices used in the NTNU model, their applicability as the input parameters in a TBM cutterhead design model was evaluated. Among a variety of rock properties, it was possible to estimate a broad range of cutter forces based on DRI used in the NTNU model. However, based solely on rock properties without the consideration of mechanical cutting conditions, it was impossible to predict the cutting performance of a cutter. From a series of sensitivity analyses on a number of probable factors influencing TBM performance, it was shown that mechanical cutting conditions such as cutter spacing and cutter penetration depth had the dominant effects on cutter forces as well as cutting specific energy. On the other hand, the optimum cutting conditions and the critical penetration depths were highly dependent on rock properties. Especially, from higher sensitivity ranks of drillability indices-related rock properties, it was suggested that they should be utilized to predict the performance of a TBM cutter more accurately.