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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 24, Issue 6D - Nov 2004
Volume 24, Issue 6C - Nov 2004
Volume 24, Issue 6B - Nov 2004
Volume 24, Issue 6A - Nov 2004
Volume 24, Issue 5D - Sep 2004
Volume 24, Issue 5C - Sep 2004
Volume 24, Issue 5B - Sep 2004
Volume 24, Issue 5A - Sep 2004
Volume 24, Issue 4D - Jul 2004
Volume 24, Issue 4C - Jul 2004
Volume 24, Issue 4B - Jul 2004
Volume 24, Issue 4A - Jul 2004
Volume 24, Issue 3D - May 2004
Volume 24, Issue 3C - May 2004
Volume 24, Issue 3B - May 2004
Volume 24, Issue 3A - May 2004
Volume 24, Issue 2D - Mar 2004
Volume 24, Issue 2C - Mar 2004
Volume 24, Issue 2B - Mar 2004
Volume 24, Issue 2A - Mar 2004
Volume 24, Issue 1D - Jan 2004
Volume 24, Issue 1C - Jan 2004
Volume 24, Issue 1B - Jan 2004
Volume 24, Issue 1A - Jan 2004
Selecting the target year
Development of Automated Slope Monitoring System for Management and Failure forecast of Load Cut Slopes
Cho, Sam-Deok ; Lee, Kwang-Wu ; Yoon, Soo-Ho ; Kim, Choon-Sik ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 1~10
A cost-effective automated slope monitoring system is developed to monitor hazardous cut slopes along highways. This automated slope monitoring system consists of data-collection and visual monitoring, data-transmitting, database and Internet service, and alarm system. Wire-line extensometer, automatic raingauge, and CCD camera are selected as monitoring instruments in this system, after consideration of failure characteristics of roadside cut slopes in the country. And detailed hardware and software designs have been made for each sub-system. Sample hardwares have been made for data collection and visual monitoring, and data-transmitting system. In addition, studies have been carried out for the proper operation of the newly developed monitoring system. First, for the effective use of the monitoring system in the country, a method for determining the priority of slope monitoring is suggested. Second, for the proper operation of the newly developed monitoring system. First, for the effective use of the monitoring system in the country, a method for determining the priority of slope monitoring is suggested. Second, for the proper operation of the system, the criteria for early warning of slope failure are suggested. The criteria for early warning include surface displacement criterion and rainfall criterion. The developed automated monitoring system has been tested in the laboratory successfully.
Behavior of Single Pile in Direction of the Repeated Lateral Loads
Bae, Jong-Soon ; Kim, Sung-Ho ; Kim, Jae-Hyoun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 11~17
In this paper, a series of model testing were performed to study the lateral behavior characteristics of single pile in direction of the repeated lateral load (five times). Model tests were performed in changing several kinds of the parameters; relative density in soil (Dr=31%, 53%, 72%, 92%), direction of the lateral load (one-way, two-way). A summary test results were analyzed through the experiment as follows; The lateral resistance was increased by repeated lateral load of one-way, was decreased by repeated lateral load of two-way. The point of maximum bending moment caused by repeated lateral load of one-way was occurred at shallow place as the relative density was increased. The looser grounding was, the deeper the moment rotation point is. Under the repeated lateral loads of two-way, the point of maximum bending moment and moment rotation point were unchanged.
The Characteristics of Bearing Capacity of H-Pile Groups in Granite Weathered Soils
Ahn, Byung-Chul ; Oh, Se-Wook ; Bae, Woo-Seok ; Lee, Jong-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 19~26
This experimental study was devoted to investigate bearing capacities and group efficiency of model H-pile groups in granite weathered soils under laboratory conditions. Model tests to investigate the efficiency of pile groups were performed on the variation of relative density (
) of the soil, pile spacing (S=2D, 4D, 6D) and array of piles. It was found that the average bearing capacities of H-pile group decreased 3.28 to 10.26 % in loose sand and 2.58 to 9.9 % in dense sand by increase of pile number. The results of analysis on group efficiency is that efficiency for skin friction increased 1.15 to 1.65 times before yield and 1.18 to 1.69 times after yield, for bearing capacities increased 0.87 to 0.95 times before yield and 1.1 to 1.34 times after yield.
Effects of Water Content and Pore Water Contamination on Electrical Resistivity of Unsaturated Sand
Oh, Myoung-Hak ; Lee, Ki-Ho ; Park, Jun-Boum ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 27~34
Laboratory experiments were performed to evaluate the effect of water content and pore water contamination on electrical resistivity of unsaturated sand. The electrical resistivity of unsaturated sand decreased, as gravimetric water content or dry unit weight increased. Electrical resistivity can be expressed as a function of volumetric water content, which reflects the effects of gravimetric water content and compaction degree. As volumetric water content increased, electrical resistivity exponentially decreased. Since volumetric water content can be expressed as porosity times degree of saturation, the regression equation is similar in its formation with the Archie's equation which is for saturated sand. The electrical resistivity of soil also decreased by the addition of landfill leachate. These results indicate that electrical resistivity measurements method has a potential in the evaluation of pore water contamination.
The Wave-Number Restoration Technique for the Automated Determination of the Phase-Velocity Dispersion Curve from the Continuous Surface-Wave (CSW) Method
Joh, Sung-Ho ; Ko, Hak-Song ; Kang, Tae-Ho ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 35~47
The surface-wave method has widely been used for the site investigation due to the economic advantage and the improved reliability. The typical surface-wave methods currently available are SASW method, MASW method and CSW method. The CSW method has a potential of high-quality measurement, but its inherent problems limited its use to the specific cases such as the compaction-quality control. The CSW method uses the steady-state harmonic vibration for the seismic source as in the steady-state Rayleigh-wave method, which is superior to the impact source used for other methods. However, the interpretation and analysis procedure of the CSW method is in a primitive level due to the numerical limitation of the Fourier transform. Also, the inversion analysis to evaluate the S-wave velocity profile from the phase-velocity dispersion curve is based on an empirical relationship. This study proposed a new procedure called the wave-number restoration technique to solve the inherent problems of the CSW method and to improve the reliability of the CSW measurements. To verify the validity of the proposed method in this study, the SASW results were compared with the CSW results for the numerical simulation of the CSW testing. Also, the feasibility of the proposed method was verified using the field measurements at a geotechnical site.
Analysis of Bridge Foundation Considering Impact Load and Hydraulic Force
Won, Jin-Oh ; Chung, Moon-Kyung ; Kwak, Ki-Seok ; Jeong, Sang-Seom ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 49~55
In this study the behavior of a piled pier subjected to impact load and hydraulic force in flood was investigated through the simplified three-dimensional finite element analysis technique and the elastic displacement method. In the finite element analysis, a pile cap is modeled with four-node flat shell element, and piers and piles are modeled using three-dimensional beam elements and beam-column elements, separately, and a computationally efficient algorithm is proposed to analyze the complex behavior of a whole bridge foundation. In these analyses, hydraulic forces and impact loads are evaluated from the design guidelines of domestic and foreign. It was found that the lateral displacements of a pile cap and a top of pier column were increased by hydraulic forces and impact loads, and the proposed method was more appropriate to investigate the effect of hydraulic pressure on a bridge foundation compared with the elastic displacement method.
Elasto-Plastic Analysis of Reinforced Ground using Anisotropic Yield Function (III)
Lee, Jun-Seok ; Bang, Choon-Suk ; Choi, Il-Yoon ; Lee, Hyun-Suk ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 57~63
Further enhancement of the proposed model by Lee, et at. (2000a.2001) has been made in this study by relaxing the assumptions used in the previous study on the anisotropic yield function. For this, material properties of the reinforced ground both by equilibrium as well as kinematic condition along the interface and by the mean field theory by Eshelby (1957) and Zhao (1990) are compared with each other and, as a result, the advantage/disadvantage of the models are summarized. In case of elasto-plastic analysis model, the Voigt assumption (Hill, 1963) is also introduced to compare the feasibility of the previous model on anisotropic behavior of the reinforced ground. A new anisotropic yield function model is shown to be more reliable than the previous one and the predicted result is more agreeable with the experimental data available.
Performance of Wet-Mixed Shotcrete with Powder Types Cement Mineral Accelerator
Park, Hae-Geun ; Lee, Myeong-Sub ; Won, Jong-Pil ; Kim, Jae-Kwon ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 65~69
The use of Shotcrete (Sprayed concrete) for the support of underground excavations was pioneered by the civil engineering industry. Permanent shotcrete tunnel linings such as Single-shell, NMT (Norwegian Method of Tunnelling) have been constructed in many countries for reducing construction time and lowing construction costs instead of conventional in-situ concrete linings. Among essential technologies for successful application of Permanent Shotcrete Linings, high performance shotcrete having high strength, high durability, better pumpability has to be developed in advance. This paper presents the test results of wet-mixed Steel Fiber Reinforced Shotcrete(SFRS) with powder types cement mineral accelerator. From the results, wet-mix SFRS with powdered accelerator exhibited good early strength improvement and less rebound ratio compared to the conventional liquid accelerator.
A Study on Development of the Backfilling Material for the Cavity behind the Tunnel Liner using the Stone-dust and application in the old Tunnel
Ma, Sang-Joon ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1C, 2004, Pages 71~80
Most cavities existing behind the tunnel liner are originated from various factors under design, construction or maintenance of the tunnel. The cavities usually occur at the part of crown of tunnel lining due to material segregation. These cavities are intimately related to cracks or leakage and affect the stability of tunnel. This study is on development of low-strength and flowing filling material and lightweight concrete. These backfilling materials can be applied to the cavity behind the tunnel lining. This paper shows the engineering properties of backfilling materials as the mortar type and lightweight concrete type mixed with stone-dust. The properties include unit volume weight, absorption rate and compressive strength. and the proposed backfilling materials were applied to the dilapidated old tunnel to assess the field applications. As the result of the field tests, it would be confirmed that the backfilling materials developed are effective as the reinforcement materials of the old tunnel's voids.