층상 암반 활동지역에서의 지질구조 특성 연구 = (A) study of the characteristics of geological structure in stratified rock-slide area

다국어 초록 (Multilingual Abstract)

The area under investigation for the past ten years is located in the vicinity of the Imha dam. The area is excavated for construction of new road in 1989. Differential heave in one part of the area is occurred, and differential subsidence and cracking in another part are taken place because of the road construction. The study area is the upper part of Gyeongsang System Donghwachi Formation and consists of pebbly sandstone, sandstone, shale and mudstone. Two faults are found in the study area. Geotechnical and surveying techniques used to be used not to solve the problem of the mechanism of the failure processes but to analyze the slope instability in the past. Geophysical methods(electrical resistivity method and seismic prospecting method) were applied in order to identify underground geology and geological structures. The interpretation of these slope failure studies is not a straightforward analysis, and the general conclusion is that the complexity of a slope failure requires a complex investigative approach using a combination of different geophysical methods and geotechnical methods. The Geological surveying of surface, boring, trench and geophysical prospecting were performed to grasp the geological structure characterics, and the investigation of precipitation, hydrosphere and property of clay and rock was performed in the laboratory.
As a result, it was identified that the bedding plane and clay layer were almost parallel, and the bedding plane of the road sides slope to the fault plane. The clay was identified that has relatively big volume expansion by swelling test of clay. It is considered that the sliding of slope is caused by decrease of shear strength of week zone with clay. The heave of road is also an appearance that brings about the sliding of slope occurred on the surface caused by NNE vertical fault.

목차 (Table of Contents)

• 목차 = ⅰ
• 제1장. 서언 = 1
• 제1절. 연구의 배경 = 1
• 제2절. 연구의 목적 = 2
• 제2장. 암반활동상황 및 지질 = 4
• 제1절. 암반활동 및 지형 = 4
• 제2절. 지질 = 9
• 1. 지표지질 = 9
• 1.1. 지표지질개요 = 9
• 1.2. 불연속면 = 13
• 1.2.1. 층리 = 13
• 1.2.2. 절리 = 14
• 1.2.3. 단층 = 14
• 2. 지하지질 = 18
• 2.1. Trench = 18
• 2.1.1. Trench site-1 = 18
• 2.1.2. Trench site-2 = 18
• 2.1.3. Trench site-3 = 19
• 2.2. 시추 = 21
• 2.2.1. BH-1 = 21
• 2.2.2. BH-2 = 22
• 제3장. 실내조사 및 시험 = 25
• 제1절. 수리학적 조사 = 25
• 1. 강우량 = 25
• 2. 수계 = 30
• 제2절. 점토의 특성 = 31
• 1. 점토광물의 분석 = 31
• 2. 점토의 팽창 = 33
• 2.1. 점토의 팽창성 = 33
• 2.2. 점토의 팽창실험 = 34
• 제3절. 암석의 강도 = 35
• 1. 암석의 물리·역학적 특성 = 35
• 2. 암석 강도 시험 = 35
• 제4장. 지구물리탐사 = 38
• 제1절. 전기비저항 탐사 = 38
• 1. 개요 = 38
• 2. 쌍극자 배열(Dipole-Dipole arrey) = 39
• 3. 슐럼버져 배열(Schlumberger arrey) = 40
• 4. 결과 및 해석 = 41
• 제2절. 탄성파 탐사 = 48
• 1. 개요 = 48
• 2. 굴절법 탐사 = 49
• 3. 반사법 탐사 = 50
• 4. 결과 및 해석 = 50
• 제5장. 해석 및 토의 = 54
• 제1절. 암반활동의 3차원적 해석 = 54
• 제2절. 한계평형해석 = 58
• 제6장. 결언 = 61
• 참고 문헌 = 63
• Abstract = 66