• Title/Summary/Keyword: Field capacity

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Exploring the Difficulties Experienced by the Facilitators in the Rural Field Forum (농촌현장포럼에서 퍼실리테이터들이 경험하는 어려움에 대한 탐색)

  • Jeong, Sangsook;Rhee, Shinho
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.5
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    • pp.95-104
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    • 2018
  • The purpose of this study was to explore the extent of difficulties experienced by facilitators in the rural field forum and to derive a theoretical model for improving the satisfaction of facilitators in the rural field forum. Based on grounded theory, qualitative analysis used data collected through individual in-depth interviews with 10 facilitators who are working at the rural field forum. This collected data was analyzed using the Nvivo 11 program. Using a derived theoretical model, the result of analyzing the difficulties experienced by facilitators in the rural field forum showed the core phenomenon identified as difficulties on-site the forum. There was a clarification of the issues regarding improvement of their labour conditions in order to solve the difficulties on-site the forum. The issues towards improving labour conditions were low allowance, equal assignment, guaranteed four major insurances and so on. The facilitators have been trying to activate the rural field forum by promoting their own capacity through the cooperation between colleagues, post training, seminars, and conferences.

Analysis of Load Carrying Capacity of Bridges Based on Field Data with Serviced Time (실측자료에 기초한 공용년수 증가에 따른 교량 내하력 분석)

  • Kyung, Kab Soo;Lee, Yeong Il;Lee, Sung Jin
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.1
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    • pp.31-38
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    • 2015
  • In this paper, change of load carrying capacity of bridges with time was analyzed referring to the safety inspect data stored in the KISTEC. From this study, it was known that the capacity is rated differently by various parameters such as inspector's subjective. Accordingly, an improved method, in this paper, is suggested which can correct deviation due to several uncertainties involved in rating process. The suggested method can be utilized for efficient maintenance of bridges such as cycles and determination of priority of retrofit, and estimation of service life etc.

A Study on Characteristics of Strength Increase and Bearing Capacity in Dredged and Reclaimed Soil due to Desiccation Shrinkage (준설토의 건조수축에 의한 강도증가 특성과 지지력에 관한 연구)

  • Yoo, Nam-Jae;Lee, Jong-Ho;Lee, Myung-Woog;Kim, Hyun-Joo
    • Journal of Industrial Technology
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    • v.20 no.A
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    • pp.101-111
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    • 2000
  • This research is results of experimental and numerical works on characteristic of strength increase and bearing capacity in dredged and reclaimed soil due to desiccation shrinkage. For a soil sampled from southern coastal area in Korea, basic soil property tests and standard consolidation test with falling head permeability tests were carried out to obtain consolidational characteristics of soil. Double cone penetration test, laboratory vane test and unconfined compression test were also performed to investigate the change of shear strength with degree of desiccation. Model tests were performed in 1G environment and 30G level artificially accelerated condition by using the centrifuge model test facilities to investigate the bearing capacity of desiccated ground. Test results were analyzed by using the theoretical and load-settlement characteristics method proposed by Meyehof & Hanna(1978). On the other hands, the numerical technique, using the finite strain consolidation theory considering the effect of desiccation was used to estimate the appropriate time of using heavy construction equipments in field with respect to strength increase due to desiccation.

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Evaluation of Design Parameters for Axial Bearing Capacity of Drilled Shafts by Bi-directional Loading Tests (양방향말뚝 재하시험을 통한 현장타설말뚝의 연직지지력 설계정수 산정)

  • Jung, Gyung-Ja;Cho, Chong-Suck;Kim, Myoung-Mo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.10a
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    • pp.574-584
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    • 2006
  • Bi-directional loading test data are available to evaluate the design parameters which reflect the characteristics of a construction method and the variations of ground at the site where drilled shafts are installed. The method to obtain the design parameters of a real bridge by hi-directional loading test was introduced. The plans of multi-level testing and installation of measuring instruments should be made according to the rough estimation of axial bearing capacity, the length of pile, and the construction method. While the relationship between end bearing resistance and displacement was obtained directly from the hi-directional loading test, the relationship between unit side resistance and displacement was calculated through the measuring values. 1% displacement of pile diameter was adopted as the criteria of failure for ultimate resistance. As the settlement of pile head at the total ultimate bearing capacity obtained from these method was less than 1.5 % of pile diameter, this method was conservative to use in the field.

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Design Example of Gravel Mat for Horizontal Drains (쇄석Mat를 이용한 수평배수공법 설계사례)

  • Jeong, Kyeong-Han;Lee, Young-Keun;Lee, See-Woo;Kim, Jae-Sung;Kim, Byung-Tak
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.10a
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    • pp.174-187
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    • 2005
  • Recently, because of environment, cost, supply and demand factors, though applying sea-sand as horizontal drains is getting difficult that usage of Gravel has been growing in large size of construction sites, Study on engineering properties and behavior characteristics of Gravel stratum is not thoroughgoing enough. We have applied Gravel Mat as the horizontal drains in O O construction site. We also conducted several field tests such as Material property test, Geosynthetics damage test with Repeated load, Discharge capacity test performed by inflow of upper soil and In-situ PBD Penetration test to review the application of Gravel Mat. Test results show that Gravel Mat is not only advantageous in Trafficability and Water drainage by Consolidation due to its great Internal friction angle and Permeability, but also easy to penetrate with Mandrel and has great discharge capacity and guarantee of the stability against geosynthetics damage at the same time. With these benefits Gravel Mat shows great application in fields.

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An Experimental Study on the Anchorage Capacity by Diameter and Anchor Type of Re-bar (콘크리트 구조체 매입 철근의 직경 및 유형별 앵커력 측정실험 연구)

  • Cho, Seong-Yeol;Son, Ki-Sang
    • Journal of the Korean Society of Safety
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    • v.29 no.5
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    • pp.67-73
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    • 2014
  • Construction equipment such as tower crane should be installed in a field without appropriate anchorage to cause a collapse of crane. The anchorage capacity can be varied with Anchor length, concrete strength, anchor diameter, hooked or non hooked these variables will be made and tested in the study. It is shown what anchorage capacity will be more effective case by case. Hooked and non-hooked rebar anchor concrete weight with dia 22mm rebar are shown with initial displacement at 170~220KN of hooked case and 200~210KN of non-hooked one which are linearly increased, without any ductility behavior with almost brittleness. Three(3) same test pieces are almost similarly behaviored without relation to hooked or non-hooked cases. It is found out that the bigger diameter of rebar becomes, the more resistant capacity could be made, but conversely ductility against sudden collapse similar to brittleness becomes the more insufficient. It is also found out that dia 16mm rebar could be more effectively applied to heavy support weight at construction sites.

Comparison and Analysis of Bearing Capacity Calculation Results for Shallow Foundation (얕은 기초의 지지력 산정결과를 이용한 비교 및 분석에 관한 연구)

  • Chun, Byung-Sik;Lee, Jong-Hun;Kim, Jong-Hwan;Kong, Jin-Young
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.1172-1177
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    • 2008
  • The best way to gain optimal results on the bearing capacity is to perform the plate bearing test on field but it is not always possible. In the case of not performing the bearing test but estimating bearing capacity equations, it is not yet determined what equation is appliable. In this paper the results of bearing capacity equation and the loading tests of 12 samples were compared and what the one is more reliable than others was verified. The comparison showed that the range of the values using Hansen's equation was 0.67 and 1.44 times of the measured, that of Vesic's was 0.71 and 1.27, that of Meyerhof is 0.69 and 1.1, and that of Terzaghi was 0.87 and 1.57.

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The Study of Load Test Method for In-Site Casting Pile In High Rise Building. (초고층에서의 현장타설말뚝 재하시험방법 고찰)

  • Kim, Dae-Hak;Hong, Young-Kil;Han, Sung-Moo;Gu, Ung-Hwoe;Park, Chan-Duck
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.385-392
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    • 2008
  • Modern city have had a lot of high-rise building in high standards and multi-level performance. Using of city space reach better stages by using integration. These skyscraper have increased working load on ground. that building is efficiently designed for that soil capacity is well applied. With material side, big size pile, high strength concrete and high strength steel is used for that getting enough lobby space and resisting load increased of high-rise building. limit load test and load transmitted test can make soil capacity optimized. By the way, method of measuring pile capacity is more advanced and bigger. pile type applied by high rise building have underground excavation space, also reflect regional soil property and have some fact reviewed. A lot of high rise building recently is built as land mark in Seoul, Busan and Incheon. about method of measuring capacity of foundation pile, example of construction field is compared and reviewed.

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A Comparative Study on the Evaluation of Bearing Capacity for Driven Pile in Static Load Test (현장정재하시험 결과를 통한 타입말뚝 지지력 판정법 비교 연구)

  • Chun, Byung-Sik;Seo, Deok-Dong;Choi, Heon-Kil;Yoon, Hwan-Ho
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.677-686
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    • 2005
  • The allowable bearing capacity of a pile, the most important factor in stability estimation, is determined by applying safety factor to the ultimate load or yield load. There are several but contradictory methods available in current design codes to estimate the allowable bearing capacity and the safety factor. This paper analyzes load-settlement curves obtained from 19 static load tests measured from 11 sites. At all tests, the load is applied until apparent failure is observed. The validity of the ultimate and yield load estimation method and load caculated from the settlement criterion is investigated through comparison with the measured data. In addition, a new procedure to estimate allowable load and safety factor is proposed. Additional data from field static load tests, such as those incorporated in this study, are needed to more reliably apply the proposed method in design practice.

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A Study of Improvement Pile friction in Marine Clay using Electrokinetics Treatment (전기동역학을 이용한 해성 점토 지반내의 말뚝 마찰지지력 향상에 관한 연구)

  • Lee, Kwang-Yeol;Gu, Tae-Gon;Tjandra, Daniel;Hyun, Jae-Duck
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.211-218
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    • 2004
  • The objective of this study is to enhance the ultimate bearing capacity of piles embedded in marine clay by electrokinetic(EK). The focus of improvement is at interlace between soil and pile. A series laboratory test was performed in EK cell. In each of test, the pile in the centre as anode is surrounded by cathode and it was installed in the vicinity of pile with triangular layout. The pile was made by stainless and embedded with 30cm of depth. Afterward, the DC voltage was applied to electrode over period of time. It caused flowing water from anode to cathode, thus the soil in the center of box has higher bearing capacity value than in the side of box has. It is shown by increasing of un-drained shear strength(Cu) near the pile and also ultimate bearing capacity of pile increase after EK treatment. In the future work, the continuous of this study is finding the effective DC voltage and makes EK treatment more applicable in the field.

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