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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 20, Issue 6D - Nov 2000
Volume 20, Issue 5D - Sep 2000
Volume 20, Issue 4D - Jul 2000
Volume 20, Issue 4C - Jul 2000
Volume 20, Issue 3D - May 2000
Volume 20, Issue 3C - May 2000
Volume 20, Issue 2D - Mar 2000
Volume 20, Issue 2C - Mar 2000
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Analysis on the Behaviour of Multi-Layered Foundation using the Sigle Work-Hardening Constitutive Model
Kang, Byung-Sun ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 167~167
This paper presents behaviour of multi-layered foundation that compared model foundation laboratory test data with numerical analysis for implementing a single-work hardening model developed by Lade, into a finite element method computer program. For this study, a two dimensional phisical model has been constructed and multi-layered foundation has been composited of two types-one is three layers by 30%, 60%, 95% in relative density from geological surface and the other is three layers opposited of above in relative density. The model is verified by comparing its predictions with observed data and a numerical anlaysis results in plane strain state model foundation using the parameters with axis-symmetric condition, shows correspondence. Thus, the finite element program is able to verificate the applicability. The settlement in initial loading shows smaller when rotative density of upper layer is larger than its of bottom layer, but the settlement after arrived at yielding stress by loading increasment is presented opposition result. The maximum lateral displacement when relative density of upper layer is smaller than its of bottom layer located 0.5B far from center and the maximum lateral displacement of opposition layer of above appeared 1.0B far from center.
Risk Assessment for Slopes by Means of Fuzzy Sets
Kim, Sang-Kyu ; Ryu, Chi-Hyob ; Yoon, Soo-Ho ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 179~179
A new technique that can assess the risk of slopes by means of fuzzy inference is presented in this paper. The fuzzy rule base is composed of an evaluation list for slope stability together with the experience of an expert. With this technique, vulnerable slopes can be managed most effectively by expressing quantitatively the judgement of an expert and the uncertainty of slope stability. The results of assessment involve the degree of stability of slopes, the possible travel distance of the soil mass being failed, and anticipated loss of life and properties. This technique has been examined for 88 slopes which have been foiled or shown a possibility of failure. With this examination, it is proven that this is particularly useful in determining the priority of investment for remedial works of slopes.
Behavior of Propped Walls during Deep Excavation
Yoo, Chung-Sik ; Kim, Yeon-Jung ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 195~195
This paper presents the results of small scale model tests as well as finite element analysis on the behavior of propped wall during deep excavation. Small scale model tests were performed in order to investigate the effects of various influencing factors on the wall behavior, such as stiffness of ground, wall flexural stiffness, and over-excavation. A series of two-dimensional finite element analysis on a hypothetical site was additionally performed with the aim of establishing a quantitative relationship between influencing factors and wall behavior. The results of model tests and finite element analysis indicated, among other things, that the wall behavior is significantly influenced not only by the stiffness. of the components comprising the wall system but by the construction procedure, and that the wall deflection can be more effectively reduced by decreasing the support spacing rather than increasing the stiffness. Also revealed is that the extent of settlement zone behind the wall increases with the degree of over-excavation, and that the maximum settlement amounts approximately to 70% of the maximum wall deflection.
A Prediction of the Seismic-induced Permanent Displacement of GRS-RW System
Bang, Yoon-Kyung ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 205~205
This study presents an analytical method of estimating seismic-induced permanent displacement of GRS-RW(Geosynthetic Reinforced Soil Retaining Wall) system adapted to the case of distanced surcharge. This study was based on a combination of the pseudo-static limit equilibrium (Ling, Leshchinsky & Pewy, 1997) and a 'two part wedge mechanism'(Romstad et al., 1978) for determining both the yield acceleration and the resulting permanent displacement of the facing wall under seismic excitation. The proposed method of analysis takes into account horizontal distance from the back face of wall to uniformly distributed surcharge loadings, both horizontal and vertical inertia force due to the surcharge loadings and facing walls. A series of parametric studies were conducted on GRS-RW System, investigating the effects of input parameters on the magnitude of permanent displacement. The yield seismic coefficient
for sliding mode has greater value compared to that of overturning mode. The higher the frequency of excitation, horizontal distance Iron the back face of wall to uniformly distributed surcharge loadings, length of reinforcement, and the internal friction angle of backfill soil, the smaller the permanent displacement of the facing wall is. Low duration of excitation and
value becomes the smaller the permanent displacement of the facing wall. The effect of
values were most distinct factor in proposed procedures.
Effect of Vertical Load on Tieback Walls
Kim, Nak-Kyung ; Suh, Dong-Soo ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 219~219
An anchored wall or tieback wall consists commonly of inclined anchors installed in the ground such that vertical component of anchor prestress acts downward on the structural member. This downdrag force creates the vertical settlement of the wall which affect the behavior of the tieback walls. The effect of downdrag force is studied and the beam-column method of tieback walls is modified to consider the axial behavior of walls. Downdrag force caused by the vertical component of anchor force and the vertical component of earth pressure in sand creates the settlement of the wall and increase the horizontal deflection on the wall. Without consideration of the downdrag force, the beam-column analysis of tieback walls may show underestimation of the deflection of the wall. In order to reduce the deflection of the wall and the settlement of the wall, the inclination of anchors should be as small as possible and the structural member should rest on the hard bearing stratum.
Experimental Study of Permeability Reduction in Soil-Geotextile Filter System -Anisotropic Characteristics-
Lee, In-Mo ; Kim, Joo-Hyun ; Lakshmi, N. Reddi ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 229~229
Geotextile filters are frequently used as separators in filtration and as filters in drainage. The soil-filter system can be clogged and/or blinded by fine particles which are eroded from the base soil matrix induced by the hydraulic pressure. Progressive accumulation of these particles in filters may lead to instability in geotechnical structures. Filters are inevitably related to the seepage characteristics of the base soil matrix. Weathered residual soils are adopted for the base soil since these soils are known to have unstable characteristics when exposed to water. Particle erosion, transport and clogging of weathered residual soils were studied in combination with non-woven geotextile filter. The permeability reduction induced by clogging and blinding was evaluated through an extensive experimental work. The permeability reduction was investigated both in drainage (in-plane flow) and in filtration (cross-plane flow). The test results indicate that anisotropy of the filter is an important factor controlling the behaviour of the soil-filter system.
The Characteristics of Uplift Resistance Capacity of Plate Anchors Embedded in Slope
Bae, Jong-Soon ; Kwon, Jung-Yeal ; Kim, Sung-Ho ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 243~243
The area and the length of the inclined plane have been increased with recent industrial development. It is required to make use of mountain and inclination area as the site of structures because the use rate of these areas is enlarged by the large constructions. In this study, therefore, some model experiments were performed to check the characteristics of the uplift capacity of shallow plate anchors embedded in sloped air-dried sandy ground. It was confirmed that the ultimate uplift capacity of the anchor embedded in the slope was increased with increasing ratios of the slope angle, uplift inclination of the anchor, and embedment ratio of the anchor. It was also confirmed that f, the increasing ratio of the ultimate uplift capacity in an invariable embedment ratio by the change of the uplift inclination, was increased linearly when the embedment ratio was small, while it was increased par-abolically with the increase of the embedment ratio. As the embedment ratio was increased, the value of the breakout factor was increased up to a constant maximum value. The critical embedment ratio was increased as the slope angle and the uplift inclination were increased.
The Behavior of Driven Piles using Reliability of Driving Formulas and Bearing Capacity
Park, Young-Ho ; Chang, Yong-Chai ; Lee, Jean-Soo ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 251~251
Driven piles used at highway construction sites are mostly steel pipe piles and few concrete piles. Due to safety in the field. conservative bearing capacity of these piles has been applied. To find the reliability of pile driving fromulas, construction and material specifications in highway are presented and the axial response of bored piles and/or impact-driven piles, dynamic load tests and final set value tests are carried out for 16 piles at the 5 highway construction sites as well. As results, allowable bearing capacity of the 5s' driving formula approaches to the result of CAPWAP analysis better than the capacity of Hiley's formula which uses the factors of safety 3 and 4 considering hammer efficiency. Allowable bearing capacity obtained from CAPWAP analysis is presented with types of pile installation, N value on the pile tip, and set vetoes.
An Experimental Study on the Effect of WIB using WBFS-Cement Mixture Material
Lee, Sang-Won ; Kim, Soo-Il ; Yoo, Ji-Hyeung ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 259~259
In this study, wave impeding effect, one of the wave reduction method, using WBFS-Cement mixture material was analyzed with through field experiments. Investigations of the wave reduction effect for the concrete barrier and WIB combined with concrete barrier were also carried out respectively. WBFS has merit in cost efficiency and reproductive waste matter problem. The test was analyzed using average amplitude reduction ratio for installation of WIB, concrete barrier and WTB with concrete burier. From the experiment results, it is found that WIB has wave reduction effect below 100Hz which causes a lot of serious problems in the active and passive isolation. It is also realized that installation of WIB with concrete barrier has higher wave reduction effect than that of only WIB or barrier. Therefore, it is essential to research on optimum combinations of installation between WIB and concrete barrier in order to achieve the maximum wave impeding effect.
The Effects of Compaction Water Contents and Particle Crushing for Compacted Decomposed Granite Soil
Jeong, Jin-Seob ; Yang, Jae-Hyouk ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 269~269
The geotechnical properties of decomposed granite soil is very different depending on that of parent rock and the degree of weathering. It is unstable soil physically and chemically. Especially when the soil contacts water, strength is reduced so greatly. In this study, in order to evaluate shear strength parameter
depending on compaction water contents and particle crushing, a series of direct shear test, compaction test (A method) and permeability test are performed using specimens which are sampled at Kwangju Pungam, Jeonbuk Iksan and Kyonggi Siheung. The results are summarized as follows: 1) In decomposed granite soil which have much more grains than fines, internal friction angle is almost constant and cohesion is varied greatly. However in decomposed granite soil which have much more fines than grains, the behavior is vice versa. 2) Shear strength parameter
is affected by particle crushing. 3) By dilatancy correcting, infernal friction angle is a little decrease or increase, whereas cohesion is a little decrease or same.
Axial Response of Impact-Driven H Piles using Integral Abutment Bridge
Park, Young-Ho ; Jung, Gyung-Ja ; Kim, Sung-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 281~281
To find axial responses of impact-driven H piles in embankment (SM), the piles are instrumented with electric strain gages, dynamic load tests are performed during driving, and then the damage of strain gages are checked simultaneously. Axial static load tests are performed on the same piles after installing 9 to 21 days as well. Then load-settlement behavior including residual loads is measured. In addition, to find time effect in the pile, the pile is restriked about 14 days after driving. As results, at 14 days after driving, allowable bearing capacity by CAPWAP analysis, which 2.5 of the factor of safety is applied for ultimate bearing capacity, increases 10.8%. Ultimate bearing capacity obtained from axial static load test becomes
. Also allowable bearing capacity using Davisson's offset method is
and the pile's initial stiffness response is
. And load transfer of pile at tip in moderate rock shows larger than at shaft resistance, and pile in weathered rock shows similar to tip and shaft resistance. And maximum frictional resistance is fully mobilized when the relative displacement between the soil and the pile is about
and maximum point resistance is mobilized when the pile tip moves about
of the pile diameter.
Optimum Design Method and Program for Bolted Bonding Method of Steel Pipe Pile and Cap
Park, Young-Ho ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 291~291
The several bonding methods which connect steel pipe and spread footing in pile foundation have been widely used in the field. These existing methods showed lots of difficulties in the quality control. Present bonding methods tend to either underestimate or overestimate by adopting uniform pattern of reinforcement regardless of working load of pile head. To solve these problems, a new bonding method, which is called "Bolted Bonding Method (BBM)", was developed and is being adopted in the field. BBM method was verified by the structural analysis and laboratory test and then a new design formula and an optimum design program were proposed. Uplift force of BBM shows 96, 115, 135, 152 ton according to 406.4, 508, 609.6, 812.8 mm in diamater, respectively. In addition, design load of pile is considerably affected on compressive strength of spread footing.
A Study on the Design Approach of the Pipe Roofing Reinforcement
Lee, Jun-Seok ; Bang, Chun-Seok ; Choi, Il-Yun ; Eom, Ju-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 20, issue 3C, 2000, Pages 305~305
Pipe roofing or umbrella arch method is usually employed as a reinforcing technique when a shallow tunnel is excavated over a weak rock or soil. However, proper analysis and design method on the pipe roofing method is not fully established so far, and site-oriented experience is accepted in most cases. In this study, two approaches on the analysis/design of the pipe roofing method are introduced to better understand the behavior of the reinforced tunnel: the one is based on the mean field theory; and the other on the mechanics of composite material. As a result, the orthotropic material properties of the composite made up of pipe, grout and in-situ rock are derived and these are directly used to analyze the reinforced tunnel structures. It is found that the design method based on the mean field theory which includes the shape factor of the pipe is more efficient.