• Title, Summary, Keyword: Consolidation

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The Study on Determination of the Coefficient of Terzaghi's Consolidation by Curve Fitting (Curve Fittig에 의한 Terzaghi의 압밀계수 산정방법 연구)

  • Kim, Chan Sik;Eam, Sung Hoon
    • Journal of The Korean Society of Agricultural Engineers
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    • v.56 no.1
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    • pp.101-107
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    • 2014
  • It has been known that Terzaghi's consolidation theory is not well consistent with the consolidation phenomenon on the soft clay ground, but this theory has still been adopted normally in practice because there is no method for estimating the consolidation settlement and rate easier than Terzaghi's theory. It is impossible to map whole part of consolidation settlement vs time curve to the curve of Terzaghi'z average degree of consolidation. If the primary consolidation and the secondary compression are happened same time, it would be useless of trying to find the end of primary consolidation, but it is needed for using Terzaghi's theory that the end of consolidation is determined to the time of beginning consistency between the final settlement analyzed with curve fitting and the experimented consolidation settlement.

A Study on the Characteristics of Consolidation of Soils (I) (The Influence of Pre-consolidation Load of Soils on Consolidation Characteristics) (압밀특성에 관한 연구 (I) (선행하중이 압밀특성에 주는 영향))

  • 류능환;강예묵
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.18 no.4
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    • pp.4242-4250
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    • 1976
  • The determination of the pre-consolidation load known to have a great effect on the consolidation characteristics of the soil have been researched and discussed in detail by many other researchers. A study was undertaken to investigate and compare the effect of pre-consolidation loads on the coefficient of permeability and the consolidation characterisics of soil through the consolidation test on the three types of soil samples. The results of this study are follows; 1. Large compression index is dependent on initial void ratio of the sample being used and the pressure-void ratio curve shows a curved linear relationship in over-consolidated area but a linear relationship in normally consolidated area.2. Settlement-time curve is S-shaped where the pressure is larger than pre-consolidation load and regardless of over-burden pressure, it is a similar straight line respectively in the secondary consolidation area. 3. Primary consolidation ratio of the sample increases almost linearly with the increase of over-burden pressure but the coefficient of volume compressibility decreases linearly with the increase of it. 4. Time factor of a certain degree of consolidation increases with over-burden pressure but the coefficient of consolidation decreases with it in over-consolidated area. There is a linear relationship between them in normally consolidated area. 5. The void ratio of completion point of primary consolidation decreases linearly with over-burden pressure. 6. The coefficient of permeability of sample decreases linearly with over-burden pressure in normally consolidated area, also it increases linearly with increment of the void ratio of the sample.

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Developement of Consolidation Cell of Horizontal Drainage using Standard Consolidation Tester (표준압밀시험기를 사용하는 수평배수 압밀셀의 개발)

  • Ju, Jae-Woo;Cheong, Gyu-Hyang;Cho, Sam-Deok;Lee, Chun-Ju;Park, Jong-Beom
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.678-683
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    • 2004
  • The most popular consolidation tester is a standard consolidatiion tester, which performs consolidation using the step load weight. However this apparatus is used to obtain only the vertical consolidation coefficient. Therefore the purpose of this study is to develope the horizontal consolidation cell for a horizaontal consolidation coefficient. Various size of tests have been peroformed to investigate the effect of scale effect. From the test results, it has turned out that this horizontal consolidation cell has a good function for a horizontal consolidation coefficient.

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Development of Priority Evaluation Framework for IT System Consolidation using Global Single Instance in Hightech Industry (하이테크 분양의 GSI 구현 대상 우선순위 평가 방법 및 적용 방안 연구)

  • Lee, Chi-Hun;Chang, Min-Yong;Seo, Jong-Hyen
    • Journal of the Korea Safety Management & Science
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    • v.11 no.1
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    • pp.175-182
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    • 2009
  • The effort for GSI based IT system consolidation has been continued due to the increase of the system and complication increase of system connection, mainly by the global company. Since successful example of GSI realization by part of developed company affect to Korea, global level IT system consolidation has been examined mainly by the domestic company that have great deal of overseas business. Although they have examined consolidation possibility mainly on R&D, finance, operation management part which is the base part of company management, there are limitation for consolidation realization because of the difference between regional business problem of huge cost needed for consolidation. To overcome these realization limitations, it is necessary to lead risk and cost reduction through stepwise part unity and decide Priority Evaluation Framework for Consolidation target and systematic consolidation strategy. For GSI realization, appropriate distributions of unification time according to target system are needed. In this study, based on easiness and usefulness of consolidation and connection between the targets, evaluation methodology for Priority Evaluation Framework of system consolidation has been developed. Priority Evaluation Framework has been decided by applying developed methodology to global production company of high tech industrial part. Through this methodology, companies can realize successful and stable GSI by investing global resources intensively by Priority Evaluation Framework of consolidation target system.

Consolidation Characteristics of Chungju Dam Deposit Soil in the Load Increment Ratio (하중증가비에 따른 충주댐 퇴적지반의 압밀 특성)

  • 이준대;오세욱
    • Journal of the Korean Society of Safety
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    • v.15 no.4
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    • pp.123-126
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    • 2000
  • This study shows consolidation properties resulted from the experiment made on changes by load increment ratio and consolidation duration of standard consolidation test using deposit soil of Chungju Dam. Though the comparison and analysis of the result turned out that void ratio by load increment ratio was unchanged greatly, the result was inclined as followes : the smaller load increment ratio is, the bigger void ratio is, while the bigger load increment ratio is the bigger settlement is. Also coefficient of consolidation is increased in inverse ratio to load increment ratio. Coefficient of permeability is increased in proportion to load increment ratio, it is not fixed changes by consolidation duration, however. Degree of consolidation is increased to load increment ratio.

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Studies on the Long-term Consolidation Characteristics of Peats (이탄의 장기압밀특성에 관한 연구)

  • 김재영;주재우
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.31 no.1
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    • pp.106-116
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    • 1989
  • This study aims at scrutinizing the long4errn consolidation characteristics of peats sampled at three different regions of Chonbuk province. The standard consolidation test and the single load consolidation test were performed about these samples and especially in case of the latter the loading period was 350 days. The main condusions analyzed are as follows. 1. Void ratio showed much greater values than that of the general clay and was decresed greatly according to the increase of the load. 2. In case of the relationship between the sefflement and the long-term settlement time the rate of settlement increment became great according to the increase of the load step and the long4erm settlement became linely proportional to the logarithm of time alter 10 minutes. 3. The linear correlation was showed between the long4erm settlement time and the void ratio and therefore equations by regression analysis were derived in order to estimate the long-term settlement The slope of straight lines increased according th the increase of the load step and secondary consolidation coefficients ranged from 0.04-0.27. 4. The secondary consolidation coeffcient became linealy proportional to the compression index and the ratio of Ca to CC was 0.072. 5. The period required in ending the primary consolidation was about 10 minutes and alter that the secondary consolidation coefficient appeared to have constant value. Therefore the secondary consolidation coefficient was judged to be used as a significant factor in estimating the long4erm settlement. 6. In case of the single load consolidation test the secondary consolidation coefficient showed the tendancy increasing according to the increase of the consolidation pressure.

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Study on the Coefficient of Consolidation of Marine Clay by Rowecell Consolidation Test (ROWECELL시험에 의한 해성점토의 압밀계수에 대한 연구)

  • 김종국;차영일;김혁기;김영웅
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.725-732
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    • 2003
  • It was achieved that Rowecell test for this undisturbed sample was picked by Block sampler($\phi$:250mm, L:500mm) and hydraulic piston sampler($\phi$:76mm, L:850mm) in the marine clay of YONGYUDO and YEONGJONGDO in this research. Ratio of coefficient of consolidation was analyzed through comparison with C$\_$h/ by CPTu and C$\_$v/ and C$\_$h/ by existent consolidation test. According to analysis, coefficient of consolidation of block sample is fairly greater than coefficient of consolidation of piston sample. And the bigger diameter of undisturbed sample, sample disturbance could know decreasing. Coefficient of consolidation by Rowecell test measured more greatly than coefficient of consolidation by existent consolidation test. Rowecell test could know decreasing consolidation rate because of smear effect by Mandrel injection. Also, C$\_$h/ by CPTu shows deviation by each analysis method, selection of suitable analysis method judged by important leading in the coefficient of consolidation.

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Effect of Land Consolidation on Agricultural Mechanization (경지정리 사업이 농업기계화에 미치는 영향)

  • 고학균;조성인;이중용;이정엽
    • Journal of Biosystems Engineering
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    • v.24 no.6
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    • pp.493-500
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    • 1999
  • In 1990's, two types of land consolidation has been widely carried out to enforce competativeness of rice production in Korea. One is so called large-scale land consolidation for resizing paddy field and farm road, the other is general land consolidation for changing both size and shape of field, water channel and farm road. This study was conducted to evaluate how much effect on fm mechanization the land consolidation had. To evaluate the influence of the land consolidation, theoretical analysis and surveys were accomplished. Land consolidation was analyzed to increase field efficiency by 180 to 670% depending on the type of land consolidation and machine selection. Also, land consolidation brought increment of real working time ratio by reducing traveling time on farm road. Trends of large scale mechanization and increment of custom work were observed to be accelerated by land consolidation. It also gave effect on the pattern of machine troubles. Farmers were conscious of the influence of land consolidation on machine utilization, however, in plains level of satisfaction was shown to be low.

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A Study on the Relaxion of Secondary Compression Settlement using Preloading Method (프리로딩에 의한 2차 압밀침하량 감소에 관한 연구)

  • Huh, Ik-Chang;Im, Jong-Chul;Chang, Ji-Gun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1086-1093
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    • 2005
  • In soft ground, consolidation settlement is mainly consider. The primary consolidation settlement which is the time when the excess pore water pressure is completely dispersed and the secondary consolidation settlement which follows. Recently as the depth of consolidation layer increases the consideration of not only the primary consolidation settlement but also of the secondary consolidation settlement becomes a very important element. But up to the present there were only a few in-depth study of the secondary consolidation settlement performed. At present there are a lot of methods available when it comes to the improvement of soft soil. In this study, Preloading Method which is the most commonly used soft soil improvement method locally was used in order to investigate the method for the reduction of secondary consolidation settlement. The objective of this study is to determine the amount of preloading required to reduce secondary consolidation settlement and to determine whether secondary consolidation settlement using standard consolidation test.

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The Estimation of Horizontal Coefficient of Consolidation Using Velocity Method (Velocity Method를 이용한 수평압밀계수 산정에 관한 연구)

  • 김지용;천홍래;한상재;김수삼
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.475-480
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    • 2000
  • This study was to present the method for estimating the horizontal coefficient of consolidation by using velocity method which was based on the Barren's equation. Horizontal drainage consolidation tests, including a radial drainage consolidation test, a cylindrical consolidation test, and a large soil box test, were performed to examine its validity. Using the velocity method, horizontal coefficient of consolidation was calculated and compared with lost method, √t method, Magnan & Deroy's method, Bergado's method.

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