• Title, Summary, Keyword: 평판재하시험

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Decision Method for Degree of Compaction of Subgrade Using Portable Cone Penetrometer (콘관입시험기에 의한 노상 다짐관리도 결정법)

  • 임유진;이현승;박영호;이기홍
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.161-168
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    • 2003
  • 평판재하시험은 재하시험시 표층의 매우 잘 다져진 곳에 대한 지지력 계수를 획득하여 실다짐도를 과대 평가하는 결과를 초래할 수 있다. 이에 착안하여 응력도달 범위가 작은 평판재하시험을 지양하고 콘관입시험으로부터 획득되는 노상의 관입지수로부터 지반의 다짐도를 추정할 수 있는 콘관입시험기와 구동시스템 및 해석 프로그램을 개발하였다.

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The Correlation Analysis between Dynamic Cone Penetration Test and Plate Loading Test Results for Evaluation of Dam Conditions (제체 상태 평가를 위한 동적 콘 관입시험과 평판재하시험 결과의 상관관계 분석)

  • Jung, Young-Hoon;Kim, Seongmin;Lim, Jeong-yeul
    • Journal of the Korean GEO-environmental Society
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    • v.19 no.4
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    • pp.33-38
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    • 2018
  • The internal erosion due to poor compaction of the material was the main cause of collapse of the embankment in Korea. The assessment of the compaction state of the dam body was a very important check in the safety diagnosis of the embankment. In this study, the correlation between dynamic cone penetration test and plate loading test which is the most typical compaction evaluation technique was analyzed to verify the applicability of the dynamic cone penetration test in evaluating the compaction state of the dam body. The standard penetration tests were carried out six times to define soil properties and depth of the test site. The spatial distributions were obtained by the Kriging method after 15 times of plate loading tests and 47 times of dynamic cone penetration tests. The Pearson correlation coefficient between the spatial distribution of the plate loading test and the dynamic cone penetration test spatial distribution at the constant penetration depth was calculated. The load distribution in the plate loading test and the blow counts at penetration depths of 5 cm, 10 cm and 15 cm in the dynamic cone penetration test showed a weak positive correlation.

An Evaluation Method of Deformation Moduli using Finite Element Analysis of Cyclic Plate Load Tests (반복재하 평판재하시험의 유한요소해석을 이용한 변형계수의 추정기법)

  • Oh, Seboong;Seo, Wonseok;Kwon, Ohkyun
    • Journal of the Korean GEO-environmental Society
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    • v.8 no.6
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    • pp.61-68
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    • 2007
  • The problem on cyclic plate load tests was analyzed by finite element method using an anisotropic hardening constitutive model. The constitutive model was coded to user subroutine in ABAQUS. Using the result of the analysis, Young's moduli corresponding to various strain levels were evaluated by a back calculation method and were very similar to those of input. On the basis of the back calculation method plate loading tests were verified. As a result, deformation moduli could be evaluated practically from cyclic plate load tests with respect site conditions.

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Study on Establishing the Subgrade Compaction Control Methods Based on the In-situ Elastic Modulus (현장 탄성계수에 근거한 노상 다짐관리방안 연구)

  • Choi, Jun-Seong;Han, Jin-Seok;Kim, Jong-Min
    • International Journal of Highway Engineering
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    • v.14 no.3
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    • pp.49-58
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    • 2012
  • In many countries including Korea, the design concept of pavement structure has been converted from empirical method to mechanisticempirical method since the advent of compaction control based on resilient modulus proposed by AASHTO in 1986. Studies of last decades indicates that the classical compaction control method based on relative compaction and plate bearing test(PBT) will necessarily move to the methods taking advantage of light falling weight deflectometer(LFWD) and dynamic cone penetrometer(DCP) in addition to PBT. In this study, the validity of resilient modulus prediction equation proposed by Korean Pavement Design Guide is verified by comparison with physical properties of subgrade soil and the results of structural analysis. In addition, correlational equations between elastic modulus measured by various field tests and resilient modulus estimated by empirical model are proposed. Finally, a field test-based compaction control procedure for subgrade is suggested by using proposed correlational equations.

DEVELOPMENT OF A SYSTEM FOR DECISION OF STRENGTH PARAMETERS AND OF DEGREE OF COMPACTION IN COMPACTED SOIL WITH CONE PENETROMETER (콘관입시험기를 이용한 다짐도 측정 및 지반정수 추출법 개발)

  • YuJinLim;HyeonSeungLee
    • Journal of the Korean Geophysical Society
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    • v.4 no.4
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    • pp.287-296
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    • 2001
  • 국내 건설현장에서는 성토다짐의 다짐도 확인을 위해 주로 평판재하시험(PBT)을 사용한다. 평판재하시험은 재하시험시 표층의 매우 잘 다져진 곳에 대한 지지력 계수를 획득 하여 실다짐도를 과대 평가하는 결과를 초래할 수 있다. 이에 착안하여 응력도달 범위가 작은 평판재하시험을 지양하고 콘관입시험으로부터 획득되는 노상의 관입지수로부터 지반의 다짐도를 추정할 수 있는 콘관입시험기와 구동시스템 및 해석 프로그램을 개발하였다. 개발된 시스템은 다짐차량에 간편하게 부착하여 현장에서 직접 다짐도를 획득할 수 있으며 다짐도와 더불어 다져진 지반의 전단강도정수를 동시에 측정할 수 있다.

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Development of A System for Decision of Strength Parameters and of Degree of Compaction in Compacted Soil with Cone Penetrometer (콘관입시험기를 이용한 다짐도 측정 및 지반정수 추출법 개발)

  • Im, Yu-Jin;Lee, Hyeon-Seung
    • The Journal of Engineering Research
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    • v.5 no.1
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    • pp.109-118
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    • 2004
  • 국내 건설현장에서는 성토다짐의 다짐도 확인을 위해 주로 평판재하시험(PBT)을 사용한다. 평판재하시험은 재하시험시 표층의 매우 잘 다져진 곳에 대한 지지력 계수를 획득하여 실다짐도를 과대 평가하는 결과를 초래할 수 있다. 이에 착안하여 응력도달 범위가 작은 평판재하시험을 지양하고 콘관입시험으로부터 획득되는 노상의 관입지수로부터 지반의 다짐도를 추정할 수 있는 콘관입시험기와 구동시스템 및 해석 프로그램을 개발하였다. 개발된 시스템은 다짐차량에 간편하게 부착하여 현장에서 직접 다짐도를 획득할 수 있으며 다짐도와 더불어 다져진 지반의 전단강도정수를 동시에 측정할 수 있다.

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Bearing Capacity and Settlement Characteristics of Weathered Granite Masses in Gyeonggi Area (경기지역 화강 풍화암반의 지지력 및 침하특성에 관한 연구)

  • Kim, Dong-Eun;Huh, Kyung-Han
    • Journal of the Korean Society of Hazard Mitigation
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    • v.5 no.4
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    • pp.37-47
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    • 2005
  • The purpose of this study is to estimate the bearing capacity and settlement characteristics of the weathered granite masses, and on the process to achieve the purpose, in the first place, the weathered degree according to the absorption index was examined and reviewed, then plate bearings test in in-situ depth were tested, and finally the result was compared and examined with the result of the existing, estimate method and pressuremeter test. In order to achieve the purpose of this study, a typical area distributed with weathered granite masses, gyeonggi area, was chosen as a sample site for testing, and in the result, it appeared and found out that the more the weathered degree increases when the plate bearing test are tested, the more the bearing capacity decreases a numerical indexes and the more greatly the width of the decrease of bearing capacity increases around the boundary of specific, weathered degrees. Also, In the result from estimating the bearing capacity of weathered granite masses by the existing, suggested formula, it appeared that there is a tendency that the more the weathered degree increases, the more similar the bearing capacity becomes with the result of plate bearing tests.

Coastal hydrodynamics at Sagot Beach, Baekryeong Island (백령도 사곶해수욕장의 동역학적 특성 연구)

  • Kim, Hyo-Seob;Oh, Young-Min;Jung, Byung-Soon;Jang, Chang-Hwan
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.2146-2150
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    • 2008
  • 본 연구에서는 용기포항 동방파제 건설이 사곶 수욕장에 미치는 영향을 평판재하시험, 토질분석시험, 위성사진 자료 분석, 파랑, 조류, 수심 등의 현장관측과 파랑, 파랑류, 조류, 그리고 퇴적물 이동 등에 대한 수치모형을 통하여 사곶해수욕장의 동역학적 특성을 파악하였다. 평판재하시험과 토질분석시험 결과 기존의 사곶해수욕장 지역의 지지력 변화는 거의 없는 것으로 나타났으며, 방파제 건설로 인해 퇴적이 진행 중인 지역은 상대적으로 지지력이 낮게 나타났다. 현장관측으로 수집된 파랑, 조류, 수심의 자료는 수치모형의 입력 값으로 사용되었으며, 파랑류 수치모형결과 사곶 해수욕장 부근에서 파향에 따라 약한 소규모 와류가 발생하였으며, 퇴적물이동 수치모형의 경우 국소 와류에 의한 지형변화가 발생하였으며, 남서와 북동에 약간의 퇴적이 발생하였다.

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Development of A System for Decision of Strength Parameters and of Degree of Compaction in Compacted Soil with Cone Penetrometer (콘관입시험기를 이용한 다짐도 측정 및 지반정수 추출법 개발)

  • Lim, YuJin;Lee, HyeonSeung
    • Journal of the Korean Geophysical Society
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    • v.7 no.1
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    • pp.23-30
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    • 2004
  • To evaluate the compaction in the domestic construction sites, mainly(PBT) plate bearing test is used. PBT may result in over-estimation in the well-compacted area. Estimation method for the degree of compaction was developed from the penetration index of the surface by cone penetration. The developed system is easily attached to the mobile transportation and directly can acquire the degree of compaction.

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An Experimental Study on the Relationship between Deformation and Relative Settlement for Weathered-granite (화강풍화토의 변형계수와 상대침하 관계식에 관한 실험적 연구)

  • Park, Yong-Boo
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.4 no.1
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    • pp.125-131
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    • 2013
  • To predict the real bearing capacity and settlement of the shallow foundation the plate load test results were used. But there is no field estimation method about igneous weathered soil and rock. Therefore, to predict the settlement equation, the plate load test about igneous weathered soil and rock was done in this study. To analyze the load ~ relative settlement curve by normalization, it did not use normal analysis method, but the load ~ relative settlement (s/B, s : settlement, B : breadth of plate) was used. As a result of normalization by load ~ relative settlement conception, the curve was regular regardless of plate diameter and it was suggested the relationship of in-situ soil condition and results.