• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2003.03a
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• pp.121-134
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• 2003

본 연구대상은 $\bigcirc$$\bigcirc$우회도로 Sta.3＋300~600 구간에 형성된 높이 약 50m의 대절토 암반사면으로 대부분 절취가 완료된 상태에서, 1차로 사면 좌측부의 발파암과 풍화암의 경계부를 따라 인장균열이 소규모로 형성되면서 Slip 등 사면파괴활동이 시작되었으며, 2차로 활동높이 35m, 활동폭 40m, 활동깊이 약 l0m 규모로 붕괴되었고, 주변에도 인장균열의 발생이 확인되는 등 추가 붕괴의 징후가 있어 사면의 안정성을 검토하였다. Rock Cleavages가 발달한 천매암으로 구성된 파괴활동사면을 대상으로 지표지질조사, 추가시추조사, 전기비저항탐사, 시추공 영상촬영(BIPS)을 실시하여 사면붕괴의 원인과 추후에 예상되는 붕괴의 양상을 파악하고, 연구지역에 가장 적합한 보강대책을 수립하고자 하였다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2005.03a
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• pp.193-216
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• 2005

• Proceedings of the Korean Geotechical Society Conference
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• 2006.10a
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• pp.626-631
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• 2006

본 연구는 2006년 7월 집중호우에 의해 많은 인적.물적 피해가 발생한 강원도 지역의 피해 현장을 조사하였으며, 그 중 성토사면붕괴를 붕괴유형별로 구분하고 발생원인과 특성을 분석하여 그에 따른 적절한 대책방안을 제시하였다. 집중호우에 의한 성토사면의 붕괴유형 중 토석류에 의한 도로횡단 배수구조물의 기능상실로 유수가 노면으로 침출되고 수압이 발생하여 도로가 유실된 유형과 하천선형 불량으로 만곡수충부(물이 직접 부딪히는 부분)에서 유속이 빨라져 세굴에 의한 붕괴가 전체성토붕괴사면의 83%를 차지하였다. 이에 대한 대책방안으로는 토석류를 계곡상부에서 부터 예방할 수 있는 방법으로 사방댐 및 그물망 공법 등이 좋은 대책방안이 될 수 있으며, 토석류에 의한 유송잡물을 모두 통과할 수 있도록 충분히 큰 배수시설을 설치하는 방법도 좋은 대책방안이 될 수 있다. 무엇보다 열대성 국지 폭우를 이제 일상의 한반도 기후현상으로 받아들여 주먹구구식의 일회성 대책방안을 지양하고 바뀐 강우특성과 빈도를 고려하여 계획 홍수위를 재산정하고 그에 따라 하천정비계획을 재검토해야 할 것이다.

• Journal of the Korean Society of Hazard Mitigation
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• v.4 no.3 s.14
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• pp.9-17
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• 2004

In recent years slope failure due to heavy rainfalls or local downpours usually accompanied by typhoons has increasingly occurred in Korea. Also, the damages caused by slope failure have a tendency to be more disastrous than before. This study has been conducted to prepare an early warning system for slope failure by : (1) analyzing types and causes of slope failure, (2) examining the published evaluation criteria for slope stability, (3) estimating slope stability by considering the properties of slope-forming materials as well as the topographical and geological properties of slopes, and (4) determining the most important variables of affecting the stability of the slope under consideration. The data on the variations of slope conditions measured by an automatic in-situ measurement system and then transmitted to the central analysis system by using an internet. The most important variables can be back-calculated in the central system and compared with the values for the first and second management criteria. These management criteria should be modified and corrected continuously in the future by accumulated data and knowledge related to the early warning system for slope failure.

• The Journal of Engineering Geology
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• v.12 no.4
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• pp.367-378
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• 2002

Recently, the number of tunnels on national roads has been increased due to the trend that construction of the large-scaled cut slopes is limited because of the environmental issues. Therefore, the slope failures of tunnel portal have often occurred. The tunnel portal in use has limitations on selection of the countermeasure and construction against slope failure. In the cases of Suanbo hot springs 1 and 2 tunnel portals, seedding was chosen and constructed as the countermeasureof slope failure when the tunnel was first built but collapsed in April, 2002. In this study, the failure sites were examined accurately through the site investigation and an efficient countermeasure according to stability analysis is presented. It is shown that it is very efficient to use resloping for Suanbo hot springs 1 tunnel and concrete buttress, rock anchor to reinforcement countermeasure, and attached rockfall prevention net by dividing the site into 3 sections for Suanbo hot springs 2 tunnel.

• The Journal of Engineering Geology
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• v.13 no.2
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• pp.157-170
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• 2003

This study is performed to investigate the cause of slope failure and to suggest suitable stabilization methods for the failed rock slopes. The slope which is located along the national highway between Maesan and Kakok in Dangjin-gun failed during the construction of roads. Site investigation, drilling program, field measurements, rainfall records, and stability analyses are used to investigate the cause of the slope failure. The problem determining the cut-slope angle based on the existing design manual for the construction of roads is reviewed based on the case history given in this paper. If weakness layer and geological structures such as folds and faults are developed in a slope, slope failure is possible even though the direction of slope and the direction of discontinuities depart more than $30^{\circ}$.

• The Safety technology
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• no.177
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• pp.54-57
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• 2012

• 한국공간정보시스템학회:학술대회논문집
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• 2007.06a
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• pp.413-423
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• 2007

우리나라의 자연재해는 기상학적 자연현상에 의해 주로 발생되고 있으며 그 발생원인은 태풍, 호우, 폭풍, 폭풍우, 재설, 폭풍성 우박, 해일 및 기타(낙뢰, 돌풍, 설해, 결빙, 지진 등을 포함)로 구분되며 이중 발생빈도가 가장 높은 것은 강우에 의한 재해로 전체 재해발생 원인 중 약 80%로 대부분을 차지하고 있다. 특히 사면붕괴와 관련된 자연재해(산사태, 옹벽붕괴, 매몰 등)는 최근 국지성 집중호우를 포함하여 호우의 집중 강도가 높아지는 등 기상학적 원인에 의해 매년 발생하고 있다. 따라서 우리나라에서 발생되는 자연재해와 관련한 사면붕괴의 특성을 강우특성에 따라 조사 분석할 필요가 있으며 이에 적합한 대책들이 더욱 필요하다. 이 연구에서는 산사태 유발인자와 강우조건을 고려하여 산사태 잠재가능성을 평가하고 산사태 취약지역을 분석하여 지역적인 강우특성을 고려한 산사태 가능성을 평가하였다.

• Tunnel and Underground Space
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• v.16 no.2 s.61
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• pp.146-155
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• 2006

The target slope of this study, formed during the construction of highway, is the very high infinite slope where sliding began along the discontinuity. Although an attempt was made to stabilize the upper part of the slope by installing the rock anchors, large scale failure was occurred at the lower part if the reinforced area. Afterwards, subsequent failures were observed two times. To investigate the cause of the failure, residual shear strength was measured by performing the direct shear test of rock specimen of the site. The anchor design was based on the pull-out test. Considering the slope surface where the undulation was severe and the variation of strength was very large, buttressing was used to obtain the required anchoring capacity.

• The Journal of Engineering Geology
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• v.32 no.1
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• pp.73-83
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• 2022

The factors influencing landslide occurrence were analyzed for six points on the upper slope and the 24 points on the lower slope along a forest road around Sangsan village in Chungju, Korea, where landslides have occurred due to heavy rainfall. In terms of physico-mechanical properties of the soil layer, the lower slope seemed to loosen owing to the higher porosity, lower unit weight, and lower friction angle compared with the upper slope. With respect to topographic characteristics, the lower slope had thicker regolith, more concave profile and plan curvatures, lower slope angles, and higher topographic wetness index values than the upper slope. Therefore, all the properties (except for the slope angle) appear to make the lower slope of the forest road more vulnerable to landslides than the upper slope. Apart from the physico-mechanical and topographic characteristics, inadequate maintenance and management of drainage facilities are also considered as further major factors influencing landslide occurrence.