• 한국농촌건축학회논문집
• /
• 제3권1호
• /
• pp.65-77
• /
• 2001

This paper is a study of rural settlement and housing planning in Jeongsun-Gun Kangwon Province. The method of survey to look in spot and interview, the present condition, and of the rural settlement of among the mountains. This study lays emphasis on three ri of dongmyeon Jeongson-Gun, Kangwondo retaining their present form relaytively through sample survey. Site plan of rural settlement of investigation subject involve the rural settlement in which is to search the arrangement, plan and spacial characteristic of rural settlement of among the mountains. Accordingly this study clarify the changed shape and form of rural settlement of among the mountains by selecting and put on record an scattered along.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2003년도 학술발표논문집
• /
• pp.159-162
• /
• 2003

In this study, it was proposed that a modified equation for estimating consolidation settlement on soft clay ground, which separate total settlement into primary and secondary settlement equation. The settlement by the proposed equation and by the measured settlements from laboratory model test was compared and verified for its application. It was appeared that the proposed equation from the laboratory model test approached to be more realistic comparing to the result of Terzaghi's equation. From the above application, it was concluded that the final settlement prediction by the Hyperbolic, Asaoka methods is needed to measure the initial period of settlement but the proposed equation could be much applicable in the lacking condition of measured data of the initial period.

• 한국터널지하공간학회 논문집
• /
• 제17권3호
• /
• pp.333-339
• /
• 2015

본 연구는 도심지 천층터널에서 현재까지 해석에서 무시되던 막장면 진동이 주위 구조물에 가장 큰 영향을 미치는 지표 침하에 대하여 3차원 수치해석을 이용하여 모델링하였다. 풍화토와 풍화암이 각각 50%의 비율로 구성된 복합지반을 고려하여 TBM 커터헤드에 발생하는 굴착시 토크를 산정하여 이를 시간에 따라 막장면에 재하함으로서 그 영향을 수치해석적으로 관찰하였다. 3차원 유한차분해석법을 이용하여 역학-동역학 연계해석을 통하여 지표침하 발생이력 및 분포도를 산정하였다. 연구결과, 3차원 수치해석을 통하여 막장면 진동하중에 의한 지표침하 발생경향을 성공적으로 모델링할 수 있었으며 최대 침하는 막장면에서 2.5D 후방에서 발생함을 확인하였고, 막장면 진동이 실제 지표침하에 영향을 미침을 확인하였다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1268-1277
• /
• 2008

Recently, the high speed railway comes into the spotlight as the important and convenient traffic infrastructure. In Korea, Kyung-Bu high speed train service began in about 400km section at 2004, and the Ho-Nam high speed railway will be constructed by 2017. The high speed train will run with a design maximum speed of 300-350km/hr. Since the trains are operated at high speed, the differential settlement of subgrade under the rail is able to cause a fatal disaster. Therefore, the differential settlement of the embankment must be controlled with the greatest care. Furthermore, the characteristics and causes of settlements which occurred under construction and post-construction should be investigated. A considerable number of studies have been conducted on the settlement of the natural ground over the past several decades. But little attention has been given to the compression settlement of the embankment. The long-term settlement of compacted fills embankments is greatly influenced by the post-construction wetting. This is called 'hydro collapse' or 'wetting collapse'. This wetting collapse problem for the compressibility of compacted sands, gravels and rockfills, has been recognized by several researchers. For this wetting settlement problem, we showed the test results carried out with 4 fill materials. These tests were performed under the condition that the fill materials were inundated at the first wetting. Subsequently, in this study, we investigated the long-term settlement characteristics of the fill materials under the repeated partial wetting and rising of the ground water table happend by rainfall.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 1999년도 연약지반처리위원회 학술세미나
• /
• pp.62-70
• /
• 1999

Artesian pressure exists in Yangsan site, the maximum value of which has been measured as high as 5 t/m$^2$. This paper deals with the prediction of consolidation settlement for the site with artesian pressure. The consolidation settlement at the site has been accelerated using vertical band drains. Since the artesian pressure gives lower effective stress than a static condition, its effect should be considered in the settlement prediction. This case study shows that the prediction of settlement and pore pressure dissipation agrees well with the measurements, when considering the artesian effect.

• 한국농공학회논문집
• /
• 제51권5호
• /
• pp.59-68
• /
• 2009

In this study, it was developed that the software could be used to estimate consolidation settlement by curve fitting method according to Terzaghi's consolidation theory on the condition of gradual incremental loading, and the method of estimating settlement caused by lateral displacement was suggested, in which the settlement was calculated from the difference between the settlement calculated with the developed software using the early part of measured data and the settlement measured for the short duration from the beginning of embankment in the field. The verification of the suggested method of estimating settlement caused by lateral displacement showed good results.

• 한국해양공학회지
• /
• 제5권1호
• /
• pp.35-44
• /
• 1991

This study was carried out for the purpose of pre-estimating long-term settlement under condition of actual field soil's property, in case of building up industrial sites on the marine deposit silty clay located at West Coast in Korea. This study analyzed Hyperbolic Method, Square Root Time Method and Exponential Function Method with utilization of measured survey values of settlement in In-Cheon Namdong Industrial Sites. In the future, for the continuos utilization, it seemed to be needed that further the survey values of fields should be accurartely measured for the analysis of more accurate pre-estimate about long-term settlement. Among the prediction methods of settlement Hyperbolic Method seemed to be the best fitting method for measured data. The settlement equations were derived from above three methods, for long-term settlements.

• 한국농공학회논문집
• /
• 제47권1호
• /
• pp.61-68
• /
• 2005

In this study, it was proposed that an equation for predicting consolidation settlement on soft clay ground, which separate total settlement into primary and secondary consolidation settlement equation. The consolidation settlements by the proposed equation and by the measured settlements from laboratory model test were compared and verified for its application. It was appeared that the proposed equation from the laboratory model test approach to be more realistic comparing to !the result of Terzaghi's equation. From the above application, it was concluded that the final settlement prediction by. the Hyperbolic, Asaoka methods is needed to the initial settlement but the proposed equation could be much applicable in the lacking condition of measured data of the initial period.

• 한국지반신소재학회논문집
• /
• 제19권3호
• /
• pp.35-44
• /
• 2020

본 연구에서는 연약지반에 설치된 DCM 개량체의 개량효과를 개량형식에 따라 정량적으로 비교하기 위하여 일련의 실내모형 실험을 수행하였다. 즉, 무보강 및 3종류의 DCM 개량체 형식에 대한 상재하중 재하에 따른 지반 거동을 재현하고, 지반의 침하량 및 측방변위량을 분석함으로써 DCM 개량형식에 따른 연약지반의 거동을 평가하였다. 먼저, 모형지반에 대한 성토하중 재하시험 결과 무보강의 경우에는 작은 하중 증가에도 침하가 급격히 발생한 반면에, DCM 개량체가 적용된 경우에는 상대적으로 적은 침하가 발생하였다. 그리고 상재하중 증가에 따른 지반의 측방유동 거동을 분석한 결과, 무보강의 경우에는 작은 하중 증가에도 불구하고 측방변위가 크게 발생되었다. 그러나 DCM 개량체가 적용된 경우에는 상대적으로 적은 측방유동이 발생되었으며, 동일한 하중조건에 대한 측방유동 발생량의 크기는 말뚝식, 벽식, 격자식의 순으로 나타남을 확인하였다. 따라서 격자식 DCM 개량체가 적용된 경우가 측방유동에 대하여 우수한 지반개량효과를 나타낸 것으로 평가되었다.

• Geomechanics and Engineering
• /
• 제30권2호
• /
• pp.169-185
• /
• 2022

The urbanization and increasing rate of population demands effective means of transportation system (basement and tunnels) as well as high-rise building (resting on piled foundation) for accommodation. Therefore, it unavoidable to construct basements (i.e., excavation) nearby piled foundation. Since the basement excavation inevitably induces soil movement and stress changes in the ground, it may cause differential settlements to nearby piled raft foundation. To understand settlement and load transfer mechanism in the piled raft due to excavation-induced stress release, numerical parametric studies are carried out in this study. The effects of excavation depths (i.e., formation level) relative to piled raft were investigated by simulating the excavation near the pile shaft (i.e., H_e/L_p=0.67), next to (H_e/L_p=1.00) and below the pile toe (H_e/L_p=1.33). In addition, effects of sand density and raft fixity condition were investigated. The computed results have revealed that the induced settlement, tilting, pile lateral movement and load transfer mechanism in the piled raft depends upon the embedded depth of the diaphragm wall. Additional settlement of the piled raft due to excavation can be account for apparent loss of load carrying capacity of the piled raft (ALPC). The highest apparent loss of piled raft capacity ALPC (on the account of induced piled raft settlement) of 50% was calculated in in case of H_e/L_p = 1.33. Furthermore, the induced settlement decreased with increasing the relative density from 30% to 90%. On the contrary, the tilting of the raft increases in denser ground. The larger bending moment and lateral force was induced at the piled heads in fixed and pinned raft condition.