초록 ▼

1. 현장조사, 현장 및 실내시험
1) 현지 암반의 강도 측정
2) 암반의 물성시험 및 암반내 절리면의 특성 시험
3) 갱도 및 채광장의 암반내 불연속면 조사
4) 해석의 입력자료를 위한 초기지압측정
5) pillar 내의 응력측정
2. 시험대상 석회석 광산에 대한 안정성 평가
1) 기존의 암반분류법개선을 통한 광산적용 가능한 암반분류법의 개발
2) 암반분류법을 통한 갱도 안정성의 평가
3) GSI 암반분류법에 의한 암반특성의 추정
4) 새로운 분류법 개발을 위한 요소 평가

1. 현장조사, 현장 및 실내시험
1) 현지 암반의 강도 측정
2) 암반의 물성시험 및 암반내 절리면의 특성 시험
3) 갱도 및 채광장의 암반내 불연속면 조사
4) 해석의 입력자료를 위한 초기지압측정
5) pillar 내의 응력측정
2. 시험대상 석회석 광산에 대한 안정성 평가
1) 기존의 암반분류법개선을 통한 광산적용 가능한 암반분류법의 개발
2) 암반분류법을 통한 갱도 안정성의 평가
3) GSI 암반분류법에 의한 암반특성의 추정
4) 새로운 분류법 개발을 위한 요소 평가
3. 갱도 및 채광장의 안정성에 영향을 미칠 수 있는 암반공학적 요소 검토
1) 2차원 및 3차원 수치해석
2) 암반분류법을 통한 현지 암반물성의 특성치의 추정식 개발
3) 3차원 수치해석을 통한 표준 설계요소의 파악
4. 암반의 조건에 따른 갱내 채광장 및 갱도 규격의 표준 설계기준 마련
1) 암반조건에 따른 pillar의 적정 규격에 관한 연구
2) 암반조건에 따른 무지보 갱도의 적정 규격에 관한 연구
3) 암반조건에 따른 crown pillar의 적정 규격에 환한 연구
5. 갱내환경개선을 갱내통기 조사 및 분석

Abstract ▼

Underground limestone mines were investigated based on geotechnical logging of sites, laboratory tests of rock samples, evaluating of rockmass and using the numerical analysis technique for ensuring the safety of underground openings. A series of geotechnical tests and investigations on the undergro

Underground limestone mines were investigated based on geotechnical logging of sites, laboratory tests of rock samples, evaluating of rockmass and using the numerical analysis technique for ensuring 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 suitable for the underground mine openings.
The stability of underground openings is a major concern for the safety and productivity of mining operations. Rock mass classifications methods provide the basis of many empirical design methods as well as a basis for numerical analysis. The modified critical span curve by the author have been used to assess the stability of underground 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 in-situ stresses determined from the hydraulic fracturing method.
Ventilation surveying of the gangways and working faces were also conducted simultaneously. The results of these studies of the three years are summarized belows:
1) 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 values obtained from test mines, a modified rock mass classification Is developed and can be applied to the stability analysis of mine openings. The application of new technique is suggested in this study. It provides a good correlation with the actual status of mine openings in two those selected of limestone mines. In this study the new classification system was applied only to the selected limestone mines. Once it is validated hereafter for 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 classifications do not always provide 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.
Of the many factors which influence the stability of openings, the span of the opening for a given rock mass condition provides an important parameter of design. The critical span curves proposed by Lang, the Mathews'' stability graph method and the modified critical span curve suggested by the authors have been assessed. The modified critical span curve by the author have been used to assess the stability of underground openings.
3) The results of numerical analysis of the underground openings of 6 surveyed mines showed that the yielding zone and rock falling would take place only at a limited roof of the opening. Stresses are concentrated mainly on the pillars. The parametric study showed that the disposition of pillars, the order of excavation process and thickness of crown pillar are not important for the stability. The analysis for rock falling was carried out by UNWEDGE program. But the large opening by sublevel caving will take place the unstable condition.
BEM technique is an alternative of FEM or FDM to solve a three dimensional problems of a complicated underground mine structure. Analysis by Map 3D, a BEM solution showed that a systematic support would be necessary to guarantee the stability of the pillars susceptible to a maximum deformation. A true three dimensional analysis will be carried out by taking into consideration the site specific geotechnical parameters.
4) The ventilation study suggests that underground limestone mines does not have a systematic network with proper intake and return paths. It is also necessary to study on the leakage flow along the natural caves.

목차 Contents

• 제 1 장 서론...14
• 제 2 장 국내외 기술개발 현황...17
• 제 3 장 연구개발수행 내용 및 결과...19
• 제 1 절 국내석회석광산의 현황...19
• 1. 석회석 광산현황...19
• 2. 지하채광 기술현황...22
• 3. 지원방안 및 결과검토...28
• 제 2 절 암반분류법에 의한 갱도의 안정성평가...29
• 1. 조사광산 개요 및 암반현황...29
• 2. 광산에서의 RMR과 Q분류법의 적용...38
• 3. GSI 분류법에 의한 암반특성 연구...53
• 4. Stability graph method에 의한 석회석 갱도의 안정성평가...59
• 5. 새로운 암반분류법의 제안...71
• 6. Pillar 규격의 결정...74
• 제 3 절 수압파쇄시험...78
• 1. 서론...78
• 2. 수압파쇄법의 이론적 고찰...82
• 3. 시험 방비 및 시험방법...87
• 4. 현장시험...90
• 5. 응력해석...92
• 6. 해석결과의 적용...93
• 제 4 절 수치해석에 의한 갱도안전성연구...95
• 1. 개별요소법에 의한 안정성 해석...95
• 2. Parameter변화에 따른 갱도 및 pillar의 안정성 해석...99
• 3. 낙반예상을 위한 UNWEDGE 해석...109
• 제 5 절 3차원 경계요소해석에 의한 갱도안정성 분석...114
• 1. 해석절차...115
• 2. 청림자원...115
• 3. 삼성석회석...122
• 제 6 절 석회석광산의 갱내환경개선...127
• 1. 삼성석회석...127
• 2. 전체석회석광산의 통기제안...131
• 제 7 절 결론...136
• 제 4 장 연구개발목표 달성도 및 대외기여도...140
• 제 5 장 연구개발결과의 활용계획...144
• 제 6 장 참고문헌...145