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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 ( Ju Jae Woo ),정규향 ( Cheong Gyu Hyang ),김영규 ( Kim Young Gyu ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.5
Dredged soil from sea has much higher water content than liquid limit of clay and even if small loads apply, it will suffer a great settlement. Therefore it is very difficult to perform a consolidation test with general consolidation apparatus because of high water content. In this study Rowe Cell Apparatus consolidation tests have been performed with 1 remolding clay of water content 56% and 4 slurry clays of a water content of 100%, 120%, 133% and 150%. From the test results the consolidation characteristics such as compression index, secondary compression index and consolidation coefficient have been investigated with a variation of water content of dredged soil. The equations to get consolidation constants such as a compression index, a consolidation coefficient have been proposed with the field water content.
해성점토(海成粘土)의 반복재하(反復載荷) 및 제하압밀특성(除荷壓密特性)
주재우 ( Jae Woo Ju ),김재영 ( Jae Young Kim ) 한국농공학회 1982 韓國農工學會誌 : 전원과 자원 Vol.24 No.3
This study was conducted to investigate the consolidation characteristics of repeated increasing and decreasing load m marine clay. Consolidation test was performed by the whole repetition of increasing and decreasing load and the partial repetition of increasing and decreasing load. The results obtained were as follows: 1. The void ratio e was decreased according to the increase of preloading and the repe-tition of increasing and decreasing load. 2. In case of the partial repetition of increasing and decreasing load the compression index Cc was decreased with the increase of preloading and the repetition of increa-sing and decreasing load 3. The expansion rate was greatly increased with the whole repetition of increasing and decreasing load and it was inclined to be increased with the increase of preloading in case of the partial repetition. 4. The coefficient of volume compressibility were decreased according to the repetition of increasing and decreasing load 5. The secondary consolidation coefficient was decreased with the repetition of increasing and decreasing load. Especially in case of the partial repetition, the peaks of secon-dary consolidation curves could be found to move toward the vicinity of preloading.
연약지반에 포설하는 샌드매트층의 지지력 증가효과에 관한 연구
주재우(Jae-Woo Ju),박현수(Hyun-Soo Park),박종범(Jong-Beom Park),나현호(Hyun-Ho Na) 한국토목섬유학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.4
In order to improve the bearing capacity of soft ground for the purpose of getting a trafficability of construction vehicles, the reinforcement of geosynthetics for sand-mat layer on the soft ground has often been used. As the strength of the geosynthetics has a greater value and the thickness of sand-mat system has a greater one, the bearing capacity will be greater than before. However it is very important to choose the geosynthetics properly and to determine the thickness of sand-mat properly for economical design. The bearing capacity ratios with the variation of footing width and reinforced embedment depth were deter mined for the geosynthetics only reinforced soft ground, one layer send-mat system, and two layer send-mat system against the non-reinforced soft ground.
주재우(Jae-Woo Ju),임완섭(Wan-Sub Lim),이경동(Gyeong-Dong Lee),박종범(Jong-Beom Park),김장흥(Jang-Heung Kim) 한국토목섬유학회 2010 한국토목섬유학회 학술발표회 Vol.2010 No.11
Recently the construction method of reinforcing ground by inserting the geosynthetics into the ground is being used widely. The good example is a reinforced earth retaining wall. The reinforced earth retaining wall can prevent the earth pressure developed by the back-filling soil, because of laying the reinforced material with the proper length and the proper vertical distance. The internal force of preventing a earth pressure is a pullout resistance force. Accordingly it is very important to obtain the exact pullout properties. The pullout properties have the different values by the kind of the back-filling soil and the reinforced material. The reinforced material with no extensibility, when it is pulled out, has the same pullout stress at the every point of the reinforcement. But the reinforced material with extensibility, if it is pulled out, the front part of the reinforcement is fully pulled out, but the middle part has the smaller pulled-out content. And if it is reached until more than some length, it is never pulled out. Accordingly in this study pullout tests were performed with model grounds which have the different lengths of inserted reinforcement. From the test results the change of the pullout force, the pullout stress and pullout constant was investigated. And the effect of the extensibility was also investigated about three kinds of reinforcements.