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지인택 ( Ji In Taeg ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.3
In this study, examined influence of consolidation effect that had affected by location of pump inlet that was set collection well for drainage of pore water discharged by embankment on soft ground through the field test. The results of this study are summarized as follows; 1. Initial consolidation curve value were larger than theoritic value, the cause of these phenomena were thought influence of secondary consolidation and three dimensional strain of soft clay. 2. The settlement value of Hosino method was larger than that of Hyperbolic method, but settlement value of Hyperbolic method was accurate more than that of Hosino method in the prediction of settlement. 3. When pump inlet in collection well came down from GL+0.3m to GL-1.5m, settlement value increased about 10cm and when the ground water level was made insitu after pumping had completed, settlement was expanded about 7~8cm. So it is found that location change of pump inlet had an influence on settlement remarkably. 4. If location of pump inlet in collection well for large scale estate or wide road site is lowered than original ground level, the settlement will be accelerated effectively, and at this stage automatic pump must be used in pumping.
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지인택 ( Ji In Taeg ),이달원 ( Lee Dal Won ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.1
The aim of this study was to analyze the slope stability relating to the failure of cut slopes and the characteristics of stress-strain relations obtained by limit equilibrium method, finite element method, and stereo graphic projection method for the reinforced cut slopes. The following conclusions were made: 1. To use stereographic projection method led to little possibility to take the toppling and wedge failure while to use the other methods led to the failure. It was recommended to reduce the slope inclination from 1 : 1 to 1 : 1.5~1 : 1.8 and adopt coir mesh method to protect the slope surface. 2. The position with the horizontal displacement after final excavation moved to the excavation base. The maximum shear strain values concentrated at the excavation base indicated the possibility to induce the local failure. 3. It was recommended that the slope inclination for blast rock with the slope height larger than 10m was 1 : 0.5, 1 : 1, and 1 : 1~1 : 1.5 for hard rocks, soft and ordinary rocks, and ripping and soils, respectively. 4. Berm width criteria for blast rock with the slope height larger than 10m were recommended as follow: 2~3m per 20m slope height for- hard rocks, 1~2m per 10m slope height for soft and ordinary rocks, 1~1.5m per 5m slope height for ripping and soils.
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오태민,조계춘,지인택,Oh, Tae-Min,Cho, Gye-Chun,Ji, In-Taeg 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.1
기존 발파를 이용한 암반굴착 공법은 효율적이나 심각한 수준의 발파진동 및 여굴/미굴을 발생시킨다. 이러한 단점을 보완하기 위해, 본 연구에서는 워터젯 절삭기술을 이용하여 터널 계획선을 따라 자유면을 형성한 후 발파하는 공법을 제안하고 있다. 제안공법은 (1) 발파진동/소음을 저감시키고, (2) 여굴/미굴을 최소화 시키고, (3) 굴착효율 극대화가 가능하다. 제안공법의 효과를 검증하기 위해 기존에 널리 쓰이고 있는 스무스 블라스팅(smooth blasting) 공법을 실험 대조군으로 설정하여 동일한 조건에서 현장실험을 수행하였다. 실험결과, 발파 진동은 최대 55% 감소하고 여굴/미굴은 거의 발생하지 않는 것으로 확인되었다. 또한 굴착효율은 기존공법에 비해 뛰어난 것으로 분석되었다. 본 연구에서 제안하고 있는 워터젯 자유면을 이용한 암반 발파공법은 도심지 굴착공사뿐만 아니라 지하구조물 구축공사에 널리 활용될 수 있을 것으로 기대된다. The conventional blasting method generates serious blasting vibration and underbreak/overbreak in spite of its high efficiency for rock excavation. To overcome these disadvantages, this paper introduces an alternative excavation method that combines the conventional blasting process with the free surface on the perimeter of the tunnel face using waterjet cutting technology. This proposed excavation method has advantages of (1) reducing vibration and noise level; (2) minimizing underbreak and overbreak; and (3) maximizing excavation efficiency. To verify the effects of the proposed excavation method, field tests were performed with a smooth blasting method at the same excavation conditions. Test results show that the vibration is reduced by up to 55% and little underbreak/overbreak is generated compared with the smooth blasting method. In addition, the excavation efficiency of the proposed method is greater than that of the smooth blasting method. The proposed blasting method with a free surface using waterjet cutting can be applied to urban excavation construction as well as to underground structure construction.
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강예묵,지인택,김용성,김지훈 충남대학교 농업과학연구소 1998 농업과학연구 Vol.25 No.1
This study was carried out to investigate the problem of analysis method of circular sliding, which uses a high rate to work out a countermeasure for landslides. The results of this study were summarized as follows : 1. As a result of the analysis of sliding surface along the soil layers in forty model slopes, the boundary layer in weathered soil and weathered rock indicated a very high possibility of sliding than in other places. 2. Because most landslides in Korea occur along the discontinuity face at the boundary of soil layers, below 2m. from land surface, it is a good method for safe design to work the countermeasure for these kinds of landslides in cutting slopes. 3. When the inclination of slopes is fixed and the length of slopes is changed, the cercular sliding slopes were more safe as the soil layers are more shallow and the length of sloped are shorter, but the safety ratio of infinite sliding slopes was same as the other even though their length of slopes was different. 4. As a result of the analysis by cercular sliding analysis method and infinite sliding analysis method with some condition that the inclination of slopes was 30˚ degree, because most landslides in Korea occur at this condition, these methods indicated different results to each other as well as cercular sliding analysis method showed too much safety ratio than infinite sliding analysis method.
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김지훈,강예묵,지인택 충남대학교 농업과학연구소 1997 농업과학연구 Vol.24 No.2
The results obtained by elasto-plastic analysis method about the displacement, deformation and stability on the soft ground excavation using sheet pile were summarized as follows ; 1. In the case of strut 1 step, the maximum wall displacement value in the first and the second excavation was small, but it increase remarkably after the third excavation and when the excavation depth was 8m, the point of maximum wall displacement was shown 0.75H~0.8H. 2. The value of safety factor(Fs) was increased with increasing of the penetration depth of sheet pile, cohesion and internal friction angle of ground. Safety factor was mostly effected by penetration depth of sheet pile and more effected by cohesion than internal friction angle of ground. 3. Since the deformation of sheet pile of this ground from the results of analysis and measurement increased remarkabaly after 6m excavation depth, it was desirable that the point of strut installation was GL-6m. 4. Safe excavation depth on ground by analysis considered penetration depth, cohesion and internal friction was shown at the table 3.
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