• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2002.10a
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• pp.31-42
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• 2002

최근 지하철 터널은 사용자 편의성, 도심지 접근성 및 원활한 교통처리 등을 고려하여 지반조건이 불리한 상황에서도 터널로 계획되는 경우가 많아지고 있다 따라서 시공중의 터널안정성확보, 굴착에 따른 인접구조물의 침하영향, 발파진동영향 등을 종합적으로 고려한 지보패턴 및 보조·보강공법의 결정이 매우 중요하나 정량적인 판단기준의 부재로 인하여 주로 경험적인 설계에 의존하는 경우가 많다. 본 연구에서는 도심지 지하철 터널의 복합적인 거동특성을 고려하기 위하여 여러 가지 예상위험요소의 정량화 방안을 제안하고, 다변량 통계분석기법을 활용하여 여러 가지 위험 요소들의 특성을 함축적으로 나타내는 소수의 총합적인 지표(안정성인자, 환경성인자)로 대표화 할 수 있음을 검증하였다. 안정성 인자 및 환경성 인자를 이용한 서울시 지하철 00공구 설계사례를 통해 정량화지표(Multiple Index)의 터널설계에의 적용성을 평가하고 이의 설계시 활용방안을 제안하고자 하였다.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.03a
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• pp.957-962
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• 2010

Foundation systems in urban sites are often necessary to be constructed with little vibrations and displacements to surroundings. In order to assess applicability of a new foundation system for urban sites based on soil-cement mixing technique, vibrations and displacements induced by soil-cement construction process is evaluated. Soil-cement columns were constructed to reinforce soft ground near an old masonry wall in an urban redevelopment site, and the vibrations and displacements of the old masonry wall during construction were measured. Results indicate that the vibrations and displacements induced by soil-cement construction were little and not critical to the stability of the masonry wall.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.01a
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• pp.21-24
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• 2011

일반적으로 공사현장에서 발생하는 건설소음은 주변 생활환경을 해치는 중요한 원인으로 대두되고 있으며, 최근에는 건설공사 주변에 거주하는 주민들로부터 많은 민원을 낳고 있다. 따라서 최근에는 각종 공사 시 설계 및 시공단계에서부터 건설 소음에 대한 영향평가를 실시하여 규제기준치를 초과하면 방음벽 설치나 기타 방음 대책 등에 대한 적극적인 검토 및 보완을 요구하고 있다. 이러한 관점에서 본 연구는 건설 현장고 인접해 사업계획 승인단계에 있는 현장을 대상으로 음향시뮬레이션 프로그램을 이용하여 건설 소음도를 예측하였다. 이러한 연구는 향후 각종 건설 현장과 소음 영향평가, 방음대책 수립 시 중요한 자료를 제공할 시스템으로 예상된다.

• The Safety technology
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• no.180
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• pp.12-14
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• 2012

서울시 동대문구에 위치한 답십리동(踏十里洞). 이곳 명칭은 조선 초기 무학대사(無學大師)가 왕도를 정하려고 도성에서 10리 떨어진 곳을 밟았다는 전설에서 유래됐다. 이 때문일까. 답십리는 조선왕조 500년 동안 한성부에 속해 있을 정도로 서울 동북권에서 지리적으로 중요한 역할을 담당해 왔다. 이런 답십리가 최근에 재탄생을 준비하고 있다. 답십리 뉴타운 건설이 한창 진행 중인 것이다. 이곳은 서울 도심권에 위치해 있으면서도 교통요지로 이름이 높은 청량리가 인접해 있어 여느 뉴타운 지역보다 많은 이들의 시선을 끌고 있다. 그 가운데에도 답십리16 재개발현장에 대한 이목은 남다르다. 국내 굴지의 건설사인 삼성물산이 리딩사로 시공을 담당하는 것만으로도 높은 인기를 구가하고 있는 것이다. 또한 청량리역과 신답역, 답십리역 등을 도보로 이용할 수 있는 것은 물론 내부순환도로, 동부간선도로와 가깝다는 교통의 편의성 때문에도 주목을 받고 있다. 아울러 주변에는 청계천, 답십리공원 등 녹지공간도 풍부해 생활여건이 쾌적하다는 평을 듣고 있다. 그만큼 재개발이 완료되면 삼성물산의 브랜드 타운이 형성될 것이라는 기대감이 큰 것이다. 이처럼 건설사의 이름이 걸린 만큼 이곳 현장에서는 당연히 안전을 최우선 가치로 두고 있다. 답십리16재개발현장에서는 어떤 안전활동이 전개되고 있는지 살펴봤다.

• Journal of the Korean GEO-environmental Society
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• v.14 no.12
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• pp.31-41
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• 2013

The damage caused by lateral movement occurs frequently on site where abutment or retaining wall was built on soft ground along with embankment behind and the study on stability of abutment against lateral movement has been mostly focused on soft ground. However lateral movement occurs not only on soft ground but also on embankment slope which causes the impact on structure. The bridges built in Korea are mostly on mountainous area than soft ground. This study is intended to analyze the ground behavior resulting from lateral movement using finite element analysis method to the section as well as propose the basic data for abutment design on embankment slope through the analysis of the outcome of reinforcement method. As a result, when it comes to the reinforcement with soil surcharge and stabilized pile in slope, lateral movement was reduced by 4~30% and displacement on bearing shoe on abutment was reduced by 2~13%. On the contrary, when reinforced with EPS, lateral float was reduced by 97% and maximum horizontal displacement of bearing shoe on abutment was reduced by 95%. Thus, it's necessary to identify the design technique which is applicable to domestic condition through additional tests and more reliable study using numerical analysis and comparing the measured values shall follow.

• Journal of the Korean Geotechnical Society
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• v.17 no.6
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• pp.163-171
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• 2001

It is important to pay careful attention to the backfill construction for the structural integrity of concrete box culvert. To increase the structural integrity of culvert good compaction by the dynamic compaction roller with big capacity is as effective as good backfill materials. However structural distress of the culvert could be occurred due to the excessive earth pressure by great dynamic compaction load. In this study, two box culverts were constructed with change compaction materials and construction methods. Two type of on-site soils such as subbase and subgrade materials were used as backfill materials. In most case, dynamic compaction rollers with 11 to 12 ton weights were used and vibration frequency were applied from 2000 to 2500 rpm for the great compaction energy. Backfill compactions with good quality soils were carried out to examine the effect of cushions on dynamic lateral soil pressure. Expanded polystyrene (EPS) and rubber of tire were adapted as cushion materials and they are set on the culverts before backfill construction. This paper presents the main results on the characteristics of dynamic earth pressures. Test result indicates that the amounts of increased dynamic pressures are affected with backfill materials, depth of pressure cell, and compaction condition. The earth pressure during compaction can give harmful effect to box culvert because the value of dynamic earth pressure coefficient $(\DeltaK_{dyn}=\DeltaK\sigma_h\DeltaK\sigma_v)$ during compaction is greater than that of static condition. It was observed that cushion panels of EPS(t=10cm) and rubber(t=5cm) are effective to mitigate dynamic lateral pressure on the culverts.

• Journal of Korean Tunnelling and Underground Space Association
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• v.23 no.5
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• pp.339-357
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• 2021

As the construction of trans infrastructure using the underground tunnel have been rapidly increased, various nearby excavation of existed underground facility including subway structure has been occurred in urban tunnelling. The concern and worry relating to the safety and stability of the existed facility by nearby excavation is becoming the key issues in urban tunnelling. In this study, it was conducted for existed the subway station structure at Seoul subway line which was closely located in the new Dongbuk urban metro railway to determine the behavior characteristics of station structure according to adjacent tunnel construction. Also, it was reviewed the evaluation of the safety zone and excavation method for subway structure. And after a review of damage evaluation, track irregularities and structural calculation by using a numerical analysis, stability of the subway structure according to nearby tunnel excavation was evaluated to be secured. This study is expected to be applied as useful reference in advance if you need to review the effects of existed structure according to nearby construction in complex urban tunnelling.

• Journal of Korean Tunnelling and Underground Space Association
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• v.20 no.3
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• pp.593-608
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• 2018

If a problem occurs in the strut during the construction of the braced wall, they may cause excessive deformation of the braced wall. Therefore, in this study, the behavior of the braced wall and existing tunnel adjacent to excavation were investigated assuming that the support function of strut is lost during construction process. For this purpose, a series of model test was performed. As a result of the study, the earth pressure in the ground behind wall was rearranged due to the deformation of the braced wall, and the ground displacements caused the deformation of adjacent tunnels. When the struts located on the nearest side wall from the tunnel were removed, the deformation of the braced wall and the tunnel deformation were the largest. The magnitude of transferred earth pressure depended on the location of tunnel. The increase of the cover depth of tunnel from 0.65D to 2.65D caused the increase of the earth pressure by 25.6%. As the distance between braced wall and tunnel was increased from 0.5D to 1.0D, the transferred earth pressure increased by 16% on average. Horizontal displacements of braced wall by the removal of the strut tended to concentrate around the removed struts, and the horizontal displacement increased as the strut removal position is lowered. The tunnel displacement was maximum, when the cover depth of tunnel was 1.15D and the horizontal distance between braced wall and the side of tunnel was 0.5D. The minimal displacement occurred, when the cover depth of tunnel was 2.65D and the horizontal distance between braced wall and the side of tunnel was 1.0D. The difference between the maximum displacement and the minimum displacement was about 2 times, and the displacement was considered to be the largest when it was in the range of 1.15D to 1.65D and the horizontal distance of 0.5D.

• Journal of the Korean Geotechnical Society
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• v.21 no.10
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• pp.99-112
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• 2005

The ground excavation in the urban area induces in general ground movement and subsequent damage on the adjacent building structures. So the essentials in the designing stage are the prediction of ground movement induced by the ground excavation and the damage risk assessment of buildings adjacent to the excavation. A propsed prediction method of the ground movement induced by the strutted excavation has been studied with due consideration of the existing ground movement prediction methods. A building damage risk assessment method based on the angular distortion and the horizontal strain derived from the green-field ground movement is also proposed. These methods have been applied successfully in the on-going deep excavation project in Singapore.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.202-202
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• 2019

상수관망 시스템의 목적은 수요자에게 양적으로 안정하고 질적으로 안전한 용수를 적정 수압으로 공급하는 것이다. 그러나, 상수관망 시스템은 노후화, 시공 중 파손 등 다양한 내 외적 요인들에 의해 파괴가 불가피하며, 이를 복구하는 과정에서 단수는 필연적으로 발생하게 된다. 단수피해를 효율적으로 감소시키는 방법은 인근 배수블록과의 비상연계를 실시하는 것이다. 비상연계란, 관망의 파손 등 비정상상황 발생 시 단수구역에 용수를 공급하기 위해, 인접한 배수블록과 연결된 비상관로를 운용하여 인접 배수블록으로부터 단수구역에 용수를 공급하는 것을 의미한다. 본 연구에서는 비상연계 시 연계공급을 실시하는 배수블록에서의 문제점이 아닌 연계공급을 받는 배수블록에서의 문제점을 실제 A시 관망을 바탕으로 분석하고, 이에 대한 해결책을 제안하였다. 실제 A시에서는 직경 600mm 간선관로(수지식)의 파손으로 2지 배수블록 하단부가 단수되는 사고가 발생하였다. 이에 단수피해를 최소화하고자 인근 배수블록인 1지 배수블록과의 비상연계를 실시하였으나, 2지 배수블록 하단부의 말단부분에서 고압이 발생하고 관로 파손과 같은 추가적인 문제가 발생하였다. 본 연구에서는 A시에서 실시한 비상연계 시나리오를 구축한 후 수원에서의 유한함을 고려할 수 있는 A-PDA 기반 수리해석을 실시하여 대한 고압발생의 원인을 분석하였다. 고압 문제의 원인은 연계 공급을 실시하는 1지 배수블록과 2지 배수블록간의 고도차에 의해 발생한 것으로 사료되며, 이에 대한 해결책으로 감압밸브 추가 설치, 주요 관로 복수화 방안을 제시하였다. 이후 각 해결책에 따른 모델을 구축한 후 수리해석을 실시하여 해결책이 상수관망에 미치는 영향을 분석하였다. 본 연구는 실제 관망에서 비상연계 시 발생한 문제를 분석함으로써 비상연계 시스템 구축 시 추가적으로 발생 가능한 문제 및 해결방안을 제안하였다.