Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Analysis of Characteristics using Geotechnical Investigation on the Slow-moving Landslides in the Pohang-si Area

포항지역 땅밀림지의 지반조사를 통한 땅밀림 특성 분석

  • Lee, Moon-Se (Forest Technology Division, National Forestry Cooperative Federation) ;
  • Park, Jae-Hyeon (Department. of Forest Resources, Gyeongnam National University of Science and Technology) ;
  • Park, Yunseong (Forest Technology Division, National Forestry Cooperative Federation)
  • 이문세 (산립조합중앙회 산림공학연구소) ;
  • 박재현 (경남과학기술대학교 산림자원학과) ;
  • 박윤성 (산립조합중앙회 산림공학연구소)
  • Received : 2019.03.06
  • Accepted : 2019.05.15
  • Published : 2019.06.30
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Abstract

The aim of this study was to provide basic data that could identify and help prevent a slow-moving landslide using an analysis of the relationship between below-ground characteristics and water from three slow-moving landslide areas in Pohang, Gyeongsangbuk-do, South Korea. Surface surveys, resistivity, seismic exploration, well logging, and boring surveys were conducted in the three areas. The main direction of discontinuous surface was matched with the slope direction of the three landslides. The results indicatedthat slow-moving landslides might occur in the direction of the slope. Underground water was distributed within the crush zones within the three landslide areas and flowed along the tensile cracks. There was a significant difference (p<0.01) between the mean angle of the tensile cracks and that of the underground waterflow (p=0.8019). These results indicated that the progress of a slow-moving landslide can be forecast by monitoring the location and flow of underground water within a known slow-moving landslide area.

이 연구는 포항시 세 개 땅밀림지를 대상으로 지반조사를 통하여 땅밀림지의 지하 특성과 지하수와의 관계를 분석함으로써 땅밀림 발생 방지를 위한 기초자료를 제공하기 위하여 실시하였다. 경상북도 포항지역에서 발생된 땅밀림지 세개 지역에서 지표조사, 전기비저항탐사, 굴절법 탄성파탐사, 시추공 내 영상촬영 및 시추조사를 실시하였다. 불연속면의 주 방향은 세 지역 모두 사면방향과 동일하게 나타나 땅밀림이나 붕괴 등이 발생하였을 경우 쉽게 사면방향으로 무너질 소지가 큰 것으로 분석되었다. 세 지역 모두 파쇄대는 지하수가 분포하는 지역에 포함되었으며, 인장균열 방향으로 지하수 흐름이 진행되는 것으로 분석되었다. 인장균열 평균 각도와 지하수 흐름방향의 평균 각도 간의 관계를 T-test 검정한 결과 1% 수준에서 유의한 결과(p=0.8019)를 나타내었다. 이와 같은 결과로 판단할 때 땅밀림 발생 시 지하수의 위치 및 흐름 등을 모니터링 함으로써 추후 땅밀림의 진행 상황을 예측할 수 있을 것으로 사료된다.

Keywords

HOMHBJ_2019_v108n2_233_f0001.png 이미지

Figure 1. Location map of each study site.

HOMHBJ_2019_v108n2_233_f0002.png 이미지

Figure 2. Boring point map of the study area.

HOMHBJ_2019_v108n2_233_f0003.png 이미지

Figure 3. Joint distribution by depth.

HOMHBJ_2019_v108n2_233_f0004.png 이미지

Figure 4. Joint aperture distribution by depth.

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Figure 5. The slow-moving landslides area, the third dimention and groundwater direction map (Blue line is groundwater flow direction, red line is crack direction).

Table 1. T-test of mean of angle direction of crack and mean of angle direction of groundwater flow.

HOMHBJ_2019_v108n2_233_t0001.png 이미지

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