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주재우,장용채,박종범,Ju, Jae-U,Jang, Yong-Chae,Park, Jong-Beom 한국지반공학회 1998 지반 : 한국지반공학회지 Vol.14 No.4
지오그리드를 이용한 입체적인 매트리스기초는 연약지반의 지지력을 증가시키기 위해서 증증 사용되며 그 효과를 인정받고 있다. 지오그리드-매트리스 시스템이란 그 자체의 강성에 의해 하중을 보다 더 넓게 기초지반에 분산시킴으로서 지지력의 증대효과 및 침하억제효과를 가져오는 공법이다. 그러나, 이에 대한 메카니즘은 아직 명확하게 규명되어 있지 않다. 본 연구에서는 지오그리드 매트리스기초 아래 전파응력분포 특성을 파악하기 위해 모형실험을 실시하였고, 실험에서는 지오그리드 매트리스기초와 두께 및 지지하는 기초의 강성 등을 영향인자로서 고려하였다. 실험결과로부터 매트리스기초하의 전파응력분포 특성을 파악하였고, 지오그리드 매트리스기초 설계시 지지력을 구할 수 있는 방법을 제안하였다. 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.
주재우,박종범,김장홍,송춘석,백경종,Ju, Jae-Woo,Park, Jong-Beom,Kim, Jang-Heung,Song, Chun Seok,Baek, Kyung-Jong 한국지반신소재학회 2005 한국지반신소재학회 논문집 Vol.4 No.2
인발 저항각이라는 새로운 개념은 토목섬유로 보강된 지반에서 인발 시험을 행할 때 발생되는 마찰력, 점착력, 수동저항을 포함하는 것이다. 인발 면적을 계산함에 있어 분포 면적법을 사용하였는데, 이는 그리드에 발생되는 인장력 곡선을 이용하는 방법이다. 분포면적비는 화강토나 표준사 지반에서 거의 비슷한 결과를 나타내었다. 인발 저항각은 낮은 구속하중인 $0.2kg/cm^2$일 때는 마찰각보다 더 큰 값을 보이지만, 높은 구속하중인 $0.8kg/cm^2$일 때는 마찰각보다 더 작은 각을 보였다. New concept called the pullout resistance angle has been used to express the friction, cohesion and passive resistance by pullout test at geosynthetics reinforced soil. And also in order to calculate the pullout area, the distribution area method has been used, which is a method of using the curve of tensile force exerted in geogrid. The distribution area ratio showed nearly the same result in the two kind of soils, the granite soil and the standard soil. The pullout resistance angle showed the greater value than friction angle of soil in case of low confining stress of $0.2kg/cm^2$, while it showed the smaller angle than friction of soil in case of high confining stress of $0.8kg/cm^2$.
주재우(Jae-Woo Ju),이명환(Meong-Han Lee),김장흥(Jang-Heung Kim),박종범(Jong-Beom Park),나현호(Hyun-Ho Na) 한국토목섬유학회 2011 한국지반신소재학회 학술발표회 Vol.2011 No.4
The reinforcing material inserted in the ground has the pullout resistance, and it prevents the failure of the reinforced earth retaining wall due to the effect of the pullout resistance. Therefore, the research which makes the pullout resistance lager has been actively performed. There are the reinforcements such as the woven fabric, non-woven fabric, and geogrid. In this middle the geogrid has the biggest pullout resistance. The woven and nonwoven geosynthetics have only the frictional resistance, but the geogrid has the frictional resistance and the passive resistance due to the thickness of grid reinforcement. And also in order to increase the pullout resistance and to decrease the reinforcement strain, the anker plate can be used with the geogrid. That is to say, the anker plate is inserted vertically through the geogrid and it will suffer the great passive resistance. From the test results, the important facts have been found, such as the increase of pullout resistance and the decrease of the strain of the reinforcement.
주재우(Jae-Woo Ju),박종범(Jong-Beom Park),나현호(Hyun-Ho Na),김장흥(Jang-Heung Kim) 한국토목섬유학회 2010 한국지반신소재학회 학술발표회 Vol.2010 No.4
In order to obtain the pullout parameters such as pullout friction and pullout cohesion between soil and reinforcement, pullout test is executed on the reinforced soil using the pullout test apparatus. And so far pullout testers with various sizes were developed and many research results were published. However these pullout testers have only 1-layer model box and so it is necessary to perform the test three times repeatedly. That is to say, model grounds with reinforcement should be made three times by testers. And it is a very laborious work to testers who perform the pullout test. Accordingly in this study the new pullout test apparatus with 3-layer model box was designed and produced. And it was called multi-layer pullout test apparatus. We can make the model ground at one time, with which three tests can be performed. That is, It can be said it is a very convenient apparatus and testers will be able to do easily the pullout tests. And in order to evaluate the applicability of the developed pullout test apparatus, various pullout tests were performed using Geosynthetics such as Fortrac grid, Toto grid and Strip reinforcement.