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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 22, Issue 6D - Nov 2002
Volume 22, Issue 6C - Nov 2002
Volume 22, Issue 6B - Nov 2002
Volume 22, Issue 5D - Sep 2002
Volume 22, Issue 5C - Sep 2002
Volume 22, Issue 5B - Sep 2002
Volume 22, Issue 2D - Mar 2002
Volume 22, Issue 2C - Mar 2002
Volume 22, Issue 1D - Jan 2002
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Laboratory Model Tests on Load Sharing Characteristics of Piled Raft Foundations Applied Vertical Loads on Sandy Soils
Kim, Hong-Taek ; Kang, In-Kyu ; Park, Jeong-Joo ; Park, Soon-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 111~120
The piled raft foundation is a foundation system rigidly connecting a raft with piles. In the piled raft foundation, the raft is often on its own able to provide adequate bearing capacity and only few widely spaced piles are added to the foundation to keep settlements below a certain limit. For the design of the piled raft foundations, load-sharing ratios between piles and the raft are an important design parameter. In this paper for the preliminary study of them, small-scale laboratory model tests are carried out to investigate load-sharing ratios between piles and the raft during changes in the settlement rates of piled rafts, the stiffness of raft, and the spacing of piles. In the case of piled rafts with a flexible raft, the sharing loads of piles appeared greater than those of raft at the initial state of the settlement. On the other hand, in the case of piled raft with a stiff raft, the sharing loads of raft appeared greater than those of piles. Also, based on the settlement corresponding to 1% of the pile length, the load-sharing ratio of the raft increased as the spacing of piles or the stiffness of the raft increased. The load-sharing ratio of raft are obviously more dependent on the stiffness of raft than the spacing of piles.
Estimation of Effective Diameter and Laboratory Model Tests of Pressure-Injected Grouting Soil Nails
Kim, Hong-Taek ; Kang, In-Kyu ; Kwon, Young-Ho ; Kim, Chan-Dong ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 121~131
Pressure-injected grout technique is variously applied to many civil structures. However, most designs of the pressure-injected grout technique have empirically been carried out, because of complicated mechanisms associated with the behavior of surrounding soils and the hardening process of cement grouts. In this study, mainly pursuing an efficient application of the pressure-injected grout technique to the soil nailing system, analytical equations to quantitatively estimate expanded radius of cement grout due to pressure injection are proposed. In this process, both elastic and elasto-plastic behaviors of surrounding soils are considered, and both critical and limit injection pressures are determined to define hydrofractures in soils. Also, to verify the applicability of proposed equations, laboratory model tests are carried out. Expansion pressure acting at cylindrical surface of the bore-hole and expanded radii of cement grouts under different injection pressures are compared with those predicted from the Kleyner's equation as well as the proposed equations. Scale effect of the model test equipment is further analyzed using the
program. Finally, an illustrative example of soil nailing system is given to examine the effect of pressure-injected grout technique on stability.
Analysis of Compression Characteristics of Marine Clay using the Artificial Neural Networks
Kim, Byung-Tak ; Yoon, Gil-Lim ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 133~147
New empirical correlations for compression index of marine clay were proposed in this study using the Back Propagation Neural Network (BPNN) and laboratory test results of marine clay sampled at coastal regions of the country in Korea. The compression index determined from laboratory consolidation tests was from 0.13 to 1.86 for marine clay, which sampled a great variation between locations. The compression characteristics estimated by existing empirical equations from single or multiple index parameters was compared with those of consolidation test results, which indicate still large uncertainties in estimation of compression index of soil. However, the compression index from empirical equation based on multiple index parameters proposed in this paper was closed to the measured value more than that of existing empirical equations. The result of BPNN shows that correlation coefficient and standard error between laboratory test and neural network results is nearly close to those of proposed empirical correlation. The compression index obtained from neural network using the multi-variables including natural water content, dry unit weight, liquid limit, in-situ void ratio or plastic index among various factors was close to the measured, and the standard errors between the estimated and the measured were from 0.09 to 0.14. This verifies a possibility that if BPNN be used to determine compression index, a reliable compression index can be estimated using multiple index parameters of soils.
Pumping Flux Estimation of In-ground LNG Storage Tank by Pumping Test and Seepage Analysis
Shin, Eun-Chul ; Oh, Young-In ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 149~160
For the deep excavation works, the ground water table lowering methods such as deep well method and well point method have been used to prevent from the heaving and soil particle loss by the seepage flow. However, the quantity of pumping flux is roughly estimated by using the empirical coefficient of permeability and the simple laboratory permeability tests. In this study, the pumping tests were performed to estimate the pumping flux of excavation work for LNG in-ground storage tank and calculate the pumping flux. Also, the seepage analyses were performed to evaluate the seepage flux at the excavation bottom by the commercial software SEEP/W. The results of pumping test and seepage analysis are presented to compare the in-situ measured pumping flux. Based on this study, the estimated seepage flux by pumping test is most close result compare to measured in-situ pumping flux.
Infiltration Properties of Micro Silica Grout Materials
Chun, Byung-Sik ; Kim, Jin-Chun ; Lee, Jun-Woo ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 161~171
In this study, characteristics of cement type grout materials such as grain size distribution, shape, groutability were analysed using MSG-N type Micro Cement as grout materials for evaluating injection property of Micro Cement. Solidification tests and infiltration tests were carried out for evaluating injection properties of Micro Cement and Ordinary Portland Cement. The results of solidification tests and infiltration tests showed that Micro Cement paste was injected into fine sand almost completely at pressure lower than
, but Ordinary Portland Cement wasn't injected into even coarse sand at same pressure. It is determined that Micro Cement with in excellent penetrability should be used to expect grouting effects such as prevention of liquefaction and ground reinforcement.
A Study on Tunnel Stability with Tunnel Construction by Finite Element Method
Kim, Young-Min ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 173~180
During excavation of shallow tunnels in soft ground, failure zones around the tunnel face have major influences on the stability of tunnels. In order to solve these problems, the failure mechanism of tunnel faces and the appraisal method of tunnel stability are very important. Therefore numerical models are applied to the simulation of tunnel collapse in typical longitudinal cross sections at tunnel heading. A first aspect is introduced with respect to tunnel shape and the second aspect with respect to an unsupported tunnel length. The results has shown that the stability increases as the length of unsupported tunnel heading decreases, and also that circular cross section is more stable than the other cross section shapes. The stability of tunnel has been investigated in terms of critical shear strain occurring in failure zone around the tunnel. A case study has shown good results in the appraisal of tunnel stability.
Damage Risk Assessment for Adjacent Buildings Due to Tunneling-Induced Settlement
Yoon, Hyo-Seok ; Park, Jong-Ho ; Park, Yong-Won ;
Journal of The Korean Society of Civil Engineers, volume 22, issue 2C, 2002, Pages 181~196
At present, the prediction and assessment methods for tunneling-induced building damage in urban area generally rely on 2-dimensional ground movements except 3D-FEM analysis. This paper presents a building damage assessment method considering 3-dimensional ground movements by combining the existing surface settlement curves for transverse and longitudinal direction which are based upon the normal probability distribution curve and cumulative probability form suggested by Peck(1969), Attewell et al.(1982), and others. For the estimation of influence factors for building damage, deflection ratio and horizontal strain estimation charts are developed considering the effect of relative location between tunnel face and building. Finally, building damage risk prediction charts are suggested for the preliminary prediction of tunneling-induced building damage risk. These charts are able to be used as a simple and economic tool at the design and construction stage.