• Title, Summary, Keyword: 지오그리드

Search Result 180, Processing Time 0.037 seconds

Laboratory Investigation on Construction Method of Geogrid Encased Stone Column (지오그리드 감쌈 Stone Column 제작 방안에 대한 실험적 연구)

  • Lee, Dae-Young;Yoo, Chung-Sik
    • Journal of the Korean Geotechnical Society
    • /
    • v.27 no.2
    • /
    • pp.73-80
    • /
    • 2011
  • This paper presents the results of a laboratory investigation on construction method of geogrid encased stone column (GESC). In order to analyze effects of load carrying capacity and geogrid deformation characteristics of GESC, a series of medium scale unconfined compression tests with different overlay methods and reduced model tests were performed. The test results show that the method of overlap provides a simple and effective method of encasement construction. It is also found that geogrid encasement construction using method of overlap has important factor which can be applied to field tests. The geogrid encasement method related to effect of reinforcement is presented by laboratory test results.

Durability Assessment of Geogrids by Reduction Factors (감소인자에 의한 지오그리드의 내구성 평가)

  • Jeon, Han Yong;Heo, Dai Young
    • Journal of the Korean Geosynthetics Society
    • /
    • v.3 no.2
    • /
    • pp.31-38
    • /
    • 2004
  • Long-term stability of two type geogrids were evaluated. Membrane drawn type geogrid showed the exponential type tensile property and textile type geogrid showed the rapid increase of tensile property closer toward the break point. Accelerated creep test was done for textile type geogrid but not done for membrane drawn type geogrid because of its thermal property. Creep strain for membrane drawn type geogrid was larger than the ultimate tensile strain by tensile test and reduction factor by creep deformation of textile type geogrid was smaller than that of membrane type geogrid.

  • PDF

Effects of Various Stress Histories Including Creep Loading on Strength of a Geogrid (크리프 하중을 포함한 응력이력이 지오그리드 강도에 미치는 영향)

  • Park, Young-Kon;Fumio Tatsuoka
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • /
    • pp.441-444
    • /
    • 2001
  • PVC로 코팅된 폴리에스테르 섬유로 만들어진 지오그리드 보강재에 대해 변형률을 달리하여 단일 또는 다단 크리프 하중단계를 포함한 하중을 연속적으로 작용시킴으로써 그 인장파괴강도를 검토하였다. 연구결과, 동일한 변형률에서 지오그리드의 인장파괴강도는 극한인장파괴가 되기 전에 작용된 웅력이력에 의해서 거의 영향을 받지 않는다. 또한 지오그리드의 설계파단강도는 적정한 변형률하에서 정의되어야 하며, 변형률 속도가 빠른 인장시험을 통해 지오그리드의 설계파단강도를 얻을 경우 이에 대한 보정이 필요할 것으로 사료된다.

  • PDF

Assessment of Long-Term Stability of Geosynthetic Reinforcement Materials by Reduction Factors (감소인자에 의한 토목합성보강재의 장기안정성 평가)

  • Jeon, Han-Yong;Mok, Mun-Sung;Cho, Seong-Ho;Cha, Dong-Hwan;Kim, Seong-Cheol;Ahn, Ju-Hwan
    • Journal of the Korean Geosynthetics Society
    • /
    • v.4 no.3
    • /
    • pp.11-19
    • /
    • 2005
  • Long-term stability of two type geogrids were evaluated. Membrane drawn type geogrid showed the exponential type tensile property and textile type geogrid showed the rapid increase of tensile property closer toward the break point. Short term accelerated creep test was done for textile type geogrid but done for membrane drawn type geogrid at ambient temperature because of its thermal property. Creep strain for membrane drawn type geogrid was larger than the ultimate tensile strain by tensile test. Reduction factor by creep deformation of textile type geogrid was smaller than that of membrane type geogrid. From this result, it was seen that the textile type geogrid is more stable than membrane type geogrid by creep deformation.

  • PDF

Assessment of Combined Effect of Installation Damage and Creep Deformation of Geogrids (지오그리드의 시공 시 손상 및 크리프 변형의 복합효과 평가)

  • Cho Sam-Deok;Lee Kwng-Wu;Oh Se-Yong;Lee Do-Hee
    • Journal of the Korean Geotechnical Society
    • /
    • v.21 no.5
    • /
    • pp.153-161
    • /
    • 2005
  • A series of installation damage tests and creep tests are performed to assess the combined effect of installation damage and creep deformation far the long-term design strength of geogrid reinforcement. Three types of geogrids are used to investigate the influence of the geogrid types. From the experimental results, it is shown that installation damage and creep deformation of geogrids significantly depends on the polymer types of the geogrids and the larger the installation damage, the more the combined effect of installation damage and creep deformation. In addition, The results of this study show that the tensile strength reduction factor, RF, considering the combined effect between installation damage and creep deformation is less than that calculated by the current design practice which calculates the long-term design strength of geogrids damaged during installation by multiplying two partial safety factors, $RF_{ID}$ and $RF_{CR}$.

Load Carrying Capacity of Geogrid-Encased Stone Columns in Soft Ground (연약지반에 시공되는 지오그리드 감쌈 스톤컬럼의 하중지지 특성)

  • Yoo, Chung-Sik;Kim, Sun-Bin
    • Journal of the Korean Geosynthetics Society
    • /
    • v.7 no.4
    • /
    • pp.25-36
    • /
    • 2008
  • This paper presents the results of numerical investigation on support mechanism of geogrid-encased stone columns for use in soft ground. A number of cases were analyzed using a axial-and 3D stress-pore pressure coupled model that can effectively model construction sequence and drainage as well as reinforcing effects of geogrid-encased stone columns. The results indicated that the geogrid encasement tends to significantly improve the load carrying of a stone column. Also revealed was that such a confinement effect depends on encasement length and stiffness of geogrid. It is also shown that there exist critical encasement length and stiffness of geogrid for a given condition.

  • PDF

보강토 옹벽공사용 지오그리드의 제조 및 물성

  • 전한용;김정효;김홍택;이은수
    • Proceedings of the Korean Fiber Society Conference
    • /
    • /
    • pp.152-155
    • /
    • 1998
  • 지반 보강에 주로 이용되는 지오그리드(geogrids)는 1980년대에 개발되어 다양한 제품으로 발달하여 왔으며, 지오그리드의 높은 인장강도에 의해 기존에 지오텍스타일(geotextiles)이 적용되었던 분야의 대체재로써 그 용도가 확장되고 있다[1,2]. 독립형 보강토 조립식 옹벽의 보강재로써 사용되는 지오그리드는 높은 인장강도, 높은 전단강도와 인발저항을 가져야 한다.(중략)

  • PDF

Study on Chemical Stability of Textile Geogrids (Textile Geogrids의 화학적 안정성에 관한 연구)

  • 최세환;조성호;차동환;목문성;전한용
    • Proceedings of the Korean Fiber Society Conference
    • /
    • /
    • pp.360-361
    • /
    • 2003
  • 토목합성재료(geosynthetics)의 일종인 지오그리드(geogrids) 제품은 1979년 영국에서 개발된 이래 세계적으로 그 적용 용도와 수요가 지속적으로 증가하고 있는 토목합성 보강재이다. 일반적으로 지오그리드는 올레핀계 수지를 시트 상으로 압출하여 천공 및 연신하여 제조하는 플라스틱 타입 지오그리드와 고탄성 고강력 섬유로 제직 혹은 제편하고 이를 수지로 코팅하여 제조하는 텍스타일 타입 지오그리드의 두 가지로 분류된다. (중략)

  • PDF

Evaluation of Weathered Granite Soil l Geogrid Friction Properties and Pull out Test (화강 풍화토/지오그리드 인발시험 및 마찰특성 평가)

  • 조삼덕;김진만
    • Geotechnical Engineering
    • /
    • v.12 no.4
    • /
    • pp.87-100
    • /
    • 1996
  • The pull -out test has been used to investigate the friction properties between soil and grid type geosynthetics which is useful to measure the passive bearing resistance as well as the skin friction. In this paper, the friction properties between geogrid and a weathered granite soil are investigated by performing various pull-out tests. From the test results, a rational pull out test equipment and test method is suggested by evaluating the effects of major factors (such as geogrid width, location of soil box facing, vertical loads and pulll -out displacement rate, etc.) on pull -out test results.

  • PDF

Dispersing Stress under Geogrid-Mattress Foundation (지오그리드 매트리스기호의 전파듣력에 관한 연구)

  • Ju, Jae-U;Jang, Yong-Chae;Park, Jong-Beom
    • Geotechnical Engineering
    • /
    • v.14 no.4
    • /
    • pp.117-128
    • /
    • 1998
  • Solid mattress foundation using geogrid has often been used on soft grounds to increase the bearing capacity, and its effect has received much recognition. Geogrid-mattress system is the method of construction which increases the bearing capacity and the effect of controlling settlement by dispersing load to wider foundation through its stiffness. But ifs mechanism has not been examined exactly yet. considered to be influential factors in the experiments. As a result of the experiments, the characteristic of dispersing stress under mattress foundations was understood and the way of calculating the bearing capacity in designing the mattress foundations was suggested.

  • PDF