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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 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
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A Development of Rigid Model for Left Turn Adjustment Factor of Permitted Left Turn - A Theoretical Approach
Doh, Tcheol-Woong ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 455~455
In capacity and level of service analysis at signalized intersections, calculating permissive left turn adjustment factors is the most likely cumbersome work. Though the USHCM (1994 ed.) was modified from the 1985 ed. in terms of those parts, the calculation procedures are still complicated, which follow 13 steps to obtain single adjustment factor and have some theoretical errors. To calculate the permissive left turn adjustment factors, the basic concepts of this research are based upon the assumptions that the density of opposing through traffic proportionally decreases according to lapse of green time and that the opportunity of permissive left turn increases thereupon. The permissive left turn adjustment factors are calculated from the thru-traffic equivalent factor of permissive left turn traffic, which is derived from the amount of the opportunity. The calculation modules are divided into two parts: the permissive left turn with exclusive left turn lane and that with shared left turn lane. The latter are distinguished again between the case that the shared left turn lane becomes critical lane and the case that v/c ratio of the lane and the other lane are in equilibrium. This discriminating process well accommodates to lane grouping problems which otherwise request additional efforts.
A Study on the Application of Asphalt Modifiers to Bridge Deck Pavement
Roo, Myung-Chan ; Rhee, Suk-Keun ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 463~463
Pavements on bridge deck. specially in case of long span bridges. are apt to be damaged by the excessive deflection and vibration of bridge deck due to passing traffic. Distress at this particular place can cause a serious damage to the whole bridge structure. Pavement on bridge deck has therefore to be designed in terms of protection of bridge system and pavement itself as well. Asphalt concrete mixture used to general road is applied for most of bridge deck pavements so far. Several very long span bridges are recently under construction in coastal area and mountainous area in Korea. Need for better asphalt mixture for this application on bridge deck pavement is raised among highway engineers. In this study several asphalt modifiers are introduced to improve characteristics of asphalt concrete mixture. Through various laboratory tests, two asphalt modifiers, modifier T and modifier G, are selected for bridge deck pavement purpose.
The Phase Unwrapping for the Interferometry of Sar Data
Yeu, Bock-Mo ; Jeong, Soo ; Kim, Kee-Tae ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 471~471
The phase differences in the interferogram of SAR data come out as moduli of
, which could not be expressed as the real range difference directly. For interferometry, the phase difference in interferogram should be converted to real phase difference caused by range difference of two antenna. and this procesure is called phase unwrapping. This study aims to present an algorithm to implement phase unwraping for SAR interferometry, and to reduce the noise effect in phase unwrapping by detecting the noise as like speckle ahead and preventing propagation of the noise in the phase unwrapping process.
A New Algorithm for Image Classification Using Canonical Correlation Analysis
Kim, Yong-Il ; Park, Min-Ho ; Kim, Dong-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 483~483
The objective of this study is to develop a new algorithm for classification of an image data using Canonical Correlation Analysis, which has not ever been used in image processing. Unclassified pixels can be discriminated by significance test in developed canonical correlation classification algorithm. It is found that it is easy to select training areas in comparison with existing classification techniques. Classification accuracy of canonical correlation classification results compared with ground truth data is not less than that of existing classification techniques and is about 84%. Eventually it is proposed that canonical correlation classification is of value as a new technique for image classification.
An Analysis of Area Based Image Matching Methods for Digital Photogrammetry
Yeu, Bock-Mo ; Yom, Jae-Hong ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 497~497
With the development of computer technology, photogrammetry has advanced to the new generation of digital photogrammetry following its predecessors of analog photogrammetry and analytical photogrammetry. The main concern of digital photogrammetry. at present, is to transform the manual and interactive processes of analytical photogrammetry to an autonomous system by manipulation of digital aerial imagery. But it should be noted that an autonomous system is meaningless without satisfying the accuracy requirements of general photogrammetric procedures. The core technique used in digital photogrammetry is image matching and the accuracy of image matching is the major influencing factor in the final computed coordinates. Two methods of image matching, the cross correlation matching method and the least squres matching method, were programmed and were then applied in the analysis of the accuracy and the characteristics of image matching.
A Study on the Stability Analysis by the Image Processing and Back Analysis in Tunnel
Jang, Jung-Bum ; Kim, Yong-Il ; Kim, Young-Geun ; Jeong, Han-Jung ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 505~505
Tunnel is a longitudinal structure which is constructed in underground. Therefore. it is difficult to acquire overall informations for structural characteristics of site for tunnel designs by the plan-investigations such as geophysical, laboratory testings and in-situ rock mechanics tests. Thus, it is very important to observe geological conditions of tunnel face and analyze measurement results under construction for evaluation of tunnel stability In this study, image processing system which objectively estimates characteristics of rock mass in tunnel face and back analysis system which evaluates tunnel stability by analyzing the measurement results are developed. This study explored the usefulness through the application of these systems to the in-situ tunnel site.
Dynamic Analysis of Tunnel by Using Infinite Element
Yang, Sin-Chu ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 517~517
The dynamic interaction between tunnel structures and their surrounding soil medium due to traffic loads is investigated by a hybrid IEM/FEM methodology. Dynamic infinite elements are developed for the efficient discretization of the far-field region of the unbounded soil medium. The shape functions of the infinite element are constructed based on the far-field solutions which are obtained by solving the 2-D elastic wave problems. Also they are devised so as to give a good result over all frequency range. Numerical analysis are carried out to examine the response of a tunnel subjected to a traffic load, which is simulated as a simple rectangular impulse. It is indicated that the results by the present method are in accord with ones by the boundary and finite elements coupling method.
Analysis of Anisotropic Rocks by Finite Element Method
Choi, Sang-Joon ; Kim, Soo-Il ; Jeong, Sang-Seom ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 529~529
In this study, the behavior of anisotropic rock masses are investigated by using a numerical analysis. The bedding rock sample is modeled as a linear elastic, transversely isotropic material and a finite-element program is modified in the two-dimensional plane-strain state to determine the magnitude and distribution of stress nonuniformity developed at the center portion of a specimen and the interface between the triaxial loading cap and the specimen. Based on the results obtained, it is found that the stress nonuniformity developed under the uniaxial loading increases continously with increasing the degree of anisotropy and the applied loading. In triaxial loading, the stress nonuniformity decreases as the confining pressure approaches up to a certain value equal to the applied axial stress, beyond which it however increases. It is also found that specimen's height to width ratio should be higher than 2.5:1 in order to have the uniform stress distribution under the triaxial loading.
Study into the Deformation Characteristics of Sedimentary Soft Rocks taking into account the Strain and Stress Level Dependency
Kim, You-Seong ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 539~539
Stiffness of sedimentary soft rocks was evaluated from the various types of in-situ and laboratory tests. It is shown that in triaxial compression tests of sedimentary soft rocks, axial strains from the axial displacement of the loading piston or specimen cap could be totally unreliable due to bedding errors at the top and bottom ends of a specimen. A local deformation transducer was used to measure axial strains free from the bedding error continuously from 0.001% to about 1%. At strains less than about 0.001% the do formations are virtually linear recoverable and strain rate independent and their values of Young's modulus
are virtually the same as those obtained from field shear wave velocities. The deformations become non-linear before strain reaches 0.01%. At a strain of 0.1% and at the stress level of half the peak strength, which are typical largest strain and stress levels in soft rock at working load levels. the secant Young's moduli are still about half of
3-D Numerical Analysis of Remoulded Clay Using Modified Lade's Dobule Hardening Model
Park, Byong-Kee ; Lee, Kang-Il ; Lee, Kwang-Chan ; Kim, Tae-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 553~553
This paper aimed at investigating the validation of application of modified Lade Model to the behavior analysis of remoulded clayey soil. The model was developed by authors, following Lade double surface work-hardening model with the introduction of 2nd stress invariant which is closely relevant to the physical meaning of shear stress in the soil yielding or failure. Former studies associated with this research were performed for sandy soils by Lim (1992) and for clayey soils by Kang (1995) respectively though both of them did not include intermediate principal stress (
). By supplementing the results of the cubical triaxial tests controlling
for Kwangyang clay, the applicability of the newly developed model to the analysis of clayey foundation was proved.
Behavior of Ko-Consolidated Clay in Torsion Shear Tests (2)
Hong, Won-Pyo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 565~565
The isotropic single-hardening constitutive model has been applied to predict the elasto plastic behavior of Ko-consolidated clay in torsion shear tests, which were performed along predetermined stress-paths. The stress paths were chosen to cover the full range of rotation of principal stress axes from
relative to vertical. The predicted response agrees well with the measured behavior for all torsion shear tests. This indicates that the capabilities of the model on prediction of the torsional behavior in Ko-consolidated clay are evaluated sufficiently. The effects of stress-paths, reorientation of principal stresses and cross-anisotropy are mainly observed in the prefailure stress-strain behavior. Coupling effects between stresses and strains are observed when torsion shear and vertical normal stresses are applied. The influence of the intermediate principal stress on the variation in strength is correctly reflected by the model. The direction of major principal stress is changed mainly at small shear strains or in the early stages of the tests and then converged to certain direction.
Tire Chips as Lightweight Backfill Materials
Park, Tae-Soon ; Andres, Bernal ; Chung, Hyung-Sik ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 577~577
This paper examines the use of tire chips as lightweight backfill material behind retaining wall using the finite element analyses, Scrap tires were shredded to one inch size, which were provided by a local tire recycling company, Volumetric triaxial tests have been conducted on 100% tire chip sample, sand-tire sample (40% tire chip + 60% silica sand) to obtain the volumetric stress-strain behavior of these samples. A large direct shear tests also were conducted to determine the interaction parameters between tire chips and woven geotextile. The hyperbolic parameters were interpretated using these test results to perform the FE program (SSCOMPPC). Four different numerical models of back fill materials, GW, 100% tire chip, 1005 tire chip reinforced by geotextile. tire-sand. were used and the results were compared in terms of the vertical displacement and horizontal pressure on the wall. The FE analyses showed that the vertical displacement of 100% tire chip is the most significant, however, the horizontal pressure of 100% tire chip is reduced. The use of sand and of geotextile providing the confuting pressure decreased the vertical displacement, and futhermore the horizontal pressure also decreased in the use of geotextile. In order to reduce the vertical displacement and the horizontal pressure, the inclusion of geotexrile or sand is somewhat necessary.
Mathematical Model of Soil Flushing Tests on Organic Contaminated Soils
Park, Jun-Boum ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 587~587
In situ soil flushing using decontaminant solutions such as surfactants, acids, and bases has proved to be one of the most effective soil remediation techniques applied to the contaminated subsurface with organic compounds. Laboratory soil flushing test is modeled mathematically to describe the process of decontaminant solution (solvent) extraction of contaminants adsorbed on soil particles. The model describes the process and demonstrates the effect of parameters regarding solvent flow rate, S, and organic carbon partition coefficient,
. For more hydrophobic contaminants the model predicted a longer process of remediation and for higher flow rates the model predicted a shorter process of remediation. However, there is an optimum rate at which to maximize the desorption efficiency. Flow rates higher than the optimum rate can produce hydraulic fracturing in soil matrix.
Analytical Method to Determine The Coefficient of Consolidation on Radial Electroosmotic Drain-Consolidation
Kim, Soo-Sam ; Lee, Kwang-Yeol ; Han, Sang-Jae ; Kang, Min-Soo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 595~595
The theory of electroosmosis has been applied to a strengthening of soft soils together with drain-consolidation methods by researchers. The electroosmosis is functioning to accelerate consolidation and reduce a time consuming for complete consolidation of soft soils. In these applications, rectangle. hexagon and octagon types of dispositions of electrodes are used. Investigations on design parameters such as a coefficient of consolidation, a time factor and an electric gradient, have been conducted by many investigators. In this study, the deterministic method for several design parameters is suggested and proved by experimental studies on the cylindrical electroosmotic consolidation. From this experimental study, it is also found that the coefficient of consolidation is affected more by the electric gradient than by the disposition types of electrodes.
The Estimation of Geotechnical Parameters by the Geostatistical Theory
Kim, Doo-Jun ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 3_6, 1996, Pages 605~605
The purpose of this paper is to study the best estimation of geotechnical parameters from the geostatistical theory. The approach to the purpose lies in analyzing the characteristics on direction and distance by the sample value for the geotechnical parameters using the semi-variogram concept. Based on the result, we derive the Kriging system equation from the stochastical concept and solve the equation to find the weighting factor which is applied both the point estimation and the block estimation in the particular position.