초록 ▼

1. 국내 광산 현황 분석 및 기술현황 파악을 위한 설문조사 및 분석
2. 가행 석회석 광산에 대한 안정성 평가
1) 기존의 암반분류법을 이용하여 광산 적용가능한 암반분류법 개발
2) 암반분류법을 통한 갱도 안정성의 평가
3) GSI 암반분류법에 의한 암반정수의 추정
3. 채광장의 안정성에 영향을 미칠 수 있는 암반공학적 요소 검토
1) 수치 해석
2) 해석의 입력자료를 위한 실험실 시험 및 현장의 초기지압측정
3) 암반분류법을 통한 현지 암반물성의 특성치의 추정식 개

1. 국내 광산 현황 분석 및 기술현황 파악을 위한 설문조사 및 분석
2. 가행 석회석 광산에 대한 안정성 평가
1) 기존의 암반분류법을 이용하여 광산 적용가능한 암반분류법 개발
2) 암반분류법을 통한 갱도 안정성의 평가
3) GSI 암반분류법에 의한 암반정수의 추정
3. 채광장의 안정성에 영향을 미칠 수 있는 암반공학적 요소 검토
1) 수치 해석
2) 해석의 입력자료를 위한 실험실 시험 및 현장의 초기지압측정
3) 암반분류법을 통한 현지 암반물성의 특성치의 추정식 개발
4) 3차원 수치해석 적용가능성 검토
4. 갱내환경개선을 갱내통기 조사 및 분석

Abstract ▼

Underground limestone mines were investigated with an inquiry, on site survey including geotechnical logging, laboratory tests and numerical analysis in order to ensure the safety of underground openings. A series of geotechnical tests and investigations on the underground limestone mines enabled to

Underground limestone mines were investigated with an inquiry, on site survey including geotechnical logging, laboratory tests and numerical analysis in order to ensure the safety of underground openings. A series of geotechnical tests and investigations on the underground limestone mines enabled to develop a new rock mass classification system proper to the underground mine openings.
The stability of the underground openings was analyzed with numerical simulations by taking into consideration the mechanical properties obtained from the geotechnical investigations and the in situ stresses determined from the hydraulic fracturing method. Ventilation of the roadways and working faces were analyzed in parallel. The results through the study of the first year can be summarized as follows:
1) The environmental impact substituted underground mines for the existing open pit mines. Most of the small-scale Korean limestone mines need a technical assistance from the government, because the productivity of the underground mines is generally lower than that of the open pit mines.
2) Relying on the experience of the mining engineers, underground openings are excavated without taking into account the rock mechanical properties which can differ from place to place. Based on the RMR and Q system, a modified rock mass classification which can be applied to the stability analysis of mine openings is suggested in this study. It gives a good correlation with the actual status of mine openings in two selected limestone mines. The new classification system was applied only to two selected limestone mines, in this study. Once it is validated hereafter in the other mines, a general criterion will be recommended for the evaluation of the stability of limestone mine openings.
The deformational modulus of rock mass is usually determined from the RMR and Q system, however these two classification do not always give an appropriate design parameters. It is found that GSI is more useful for the determination of the mechanical properties and the design parameters of the underground structures.
3) The numerical analysis of the underground openings of Daesung mine showed that the yielding zone would take place only at a limited periphery of the opening and the deformation converged to a stable state. Stresses are concentrated mainly on the pillars. In the Pyunghae mine, A zone of shear deformation from the hanging wall up to the footwall was observed due to close neighborhood of openings. The major principal stress acting on the pillar is about 10MPa, which equals to one tenths of the compressive strength of the intact rock, and which is far below the critical stress. The parametric study showed that the width or the height of the pillar should be greater than one and a half times the span of the opening. It is preferable to locate lower level pillars staggered to the upper level pillars and their width should be one and a half of the span of the opening.
Future study will follow these simple parametric study to deal with more realistic and complex cases of the mines applying the Mohr-Coulomb criterion or the Barton-Bandis model.
BEM technique is an alternative of FEM or FDM to solve a three dimensional problems of a complicated underground mine structure.
Analysis by Map3D, a BEM solution showed that a systematic support would be necessary to guarantee the stability of the pillars susceptible to a maximum deformation of 8.7 mm, provided that the rock mass behaves as an elastic material. A true three dimensional analysis will be carried out by taking into consideration the site specific geotechnical parameters.
4) The ventilation of the underground limestone mmes does not have a systematic network without a fixed intake and outlet. It is necessary to study on the leakage of the air flow along the natural caves.

목차 Contents

• 제 1 장 서론...14
• 제 2 장 국내외 기술개발 현황...16
• 제 3 장 연구개발수행 내장 및 결과...17
• 제 1 절 국내석회석광산의 현황 및 설문조사 분석...17
• 1. 석회석 광산의 현황...17
• 2. 지하채광기술현황...21
• 3. 지원방안 및 결과검토...25
• 4. 외국의 석회석 광산 갱내 채광의 예...26
• 제 2 절 암반분류법에 의한 갱도의 안정성평가...29
• 1. 조사광산 개요 및 암반현황...29
• 2. 광산에서의 RMR과 Q분류법의 적용...33
• 3. GSI에 의한 암반특성 연구...44
• 4. 결과요약...57
• 제 3 절 수치해석에 의한 갱도안전성 연구...59
• 1. 조사 광산에 대한 안정성 해석...60
• 2. Pillar의 배열에 대한 파라메타 연구...81
• 3. MAP3D를 이용한 석회석 광산의 안정성 해석...92
• 제 4 절 석회석 광산의 갱내환경개선...98
• 1. 통기현황...99
• 2. 갱내소요통기량 계산...101
• 3. 갱내통기상의 문제점...105
• 4. 결과 및 검토...106
• 제 5 절 결론...114
• 제 4 장 연구개발목표 달성도 및 대외기여도...117
• 제 5 장 연구개발결과의 활용계획...118
• 제 6 장 참고문헌...119