초록 ▼

$\cdot$ 심도 500ML 지하연구실험실(URL) 실험갱도 모듈 구축
- 한덕철광 신예미광산 500m 심도에 실험갱도 굴착($5m{\times}5m{\times}100m$) 및 MOU 체결
$\cdot$ 저온열균열현상을 이용한 지압측정기법/장치 개발
- 실험실 규모 검증 실험장치 제작
$\cdot$ 지반 모델링 기법개발
$\cdot$ 심부 암반 발파굴착손상대 평가기법 현장적용
- 손상대저감 제어발파

$\cdot$ 심도 500ML 지하연구실험실(URL) 실험갱도 모듈 구축
- 한덕철광 신예미광산 500m 심도에 실험갱도 굴착($5m{\times}5m{\times}100m$) 및 MOU 체결
$\cdot$ 저온열균열현상을 이용한 지압측정기법/장치 개발
- 실험실 규모 검증 실험장치 제작
$\cdot$ 지반 모델링 기법개발
$\cdot$ 심부 암반 발파굴착손상대 평가기법 현장적용
- 손상대저감 제어발파 및 발파영향평가의 URL 현장 적용 시험
$\cdot$ 수리적 굴착손상대 특성 측정기법 현장 적용 평가
- 스위스 NAGRA와 국제협력을 통한 근접수리특성장비 활용 및 URL 실증 적용
$\cdot$ SHPB와 Micro X-ray CT를 활용한 암반파괴과정 요소기술개발
- SHPB를 이용한 동적손상시험과 CT에 의한 손상가시화 및 손상평가
$\cdot$ 굴착손상영역 수치해석평가기법 개발
- UDEC-DM 손상모델 개발 및 캐나다 AECL 터널현장 적용을 통한 모델 적용성 분석

Abstract ▼

The objectives of this project are to design an URL and to develop core technologies for utilization of underground at depths. The URL is planned to be placed at the depth of 500 m from surface and should be excavated with a limited budget. Therefore, a candidate site for the URL should be found and

The objectives of this project are to design an URL and to develop core technologies for utilization of underground at depths. The URL is planned to be placed at the depth of 500 m from surface and should be excavated with a limited budget. Therefore, a candidate site for the URL should be found and selected among currently running mines. SinYeMi iron mine was finally determined and under excavation as a new URL site so as to carry out empirical researches on core technologies in the field of rock mechanics area. MOU contract between KICAM and HANDUK IRON was signed to support a construction and steady utilization of the URL site for mid-long term. A research module for experiment was designed and under construction with the dimension of $5m{\times}5m{\times}100m$, which consists of an access tunnel, a preparatory room and an experimental station. Geology of the SinYeMi URL site has igneous rock (quartz porphyry) and sedimentary rock (limestone and sandstone).
Core technologies are classified into four basic topics like an assessment technique of excavation disturbed zone(EDZ), a verification of a novel stress measurement method using cryogenic thermal cracking, a hydrogeological characterization of an URL site and an application of TPMS and AE/MS monitoring technique.
Assessment of EDZ is important for the support requirements and for the long-term safety of a repository for geological disposal of radioactive waste. Related to the EDZ, a development of numerical modeling technique and a field test by seismic prospecting were preformed. The UDEC-DM model was developed and used to analyse a non circular tunnel in order to quantify and characterize the EDZ. The deformability and strength parameters of the assemblage of polygonal blocks that are used to simulate the flaws in intact rock were calibrated to the intact rock properties determined from laboratory uniaxial compressive tests. To estimate the change in rock stiffness, the effective shear modulus related to the crack density was applied. Crack density in the UDEC-DM model was defined by the ratio of fractured flaw length to the total length of polygonal block periphery for the unit area. The effective shear modulus from the crack density in the UDEC-DM was compared to the rock mass shear modulus recorded by the seismic velocities. In the ChoongJu URL site at the depth of 200 m, the field test for the assessment of EDZ induced by blasting was accomplished by using SHT (side hole test) and VST (vector seismic tomography). The estimation results of EDZ were different depending on prospecting methods and found to be larger in comparison with a preliminary estimation. To enhance the reliability of field test, a prospecting method using 5-wave can be applicable and a development of the related equipments should be followed up.
A new stress measurement method suggested herein attempts to overcome some of the disadvantages in the current techniques. The invention includes a novel concept, methodology and devices involved. This novel concept is basically a combination of borehole stress relieving and borehole fracturing techniques, by means of inducing thermal tensile stresses at the borehole periphery by the use of a cryogenic fluid such as Liquid Nitrogen. The numerical verification of this method had been accomplished. for experimental verification, in this year, 3 dimensional compressive loading test frame was designed and manufactured with satisfying boundary conditions used in the numerical verification.
For a hydrogeological characterization of the ChoongJu URL site, modular multi-packer system (MMPS) was applied, which had been developed by NAGRA, Switzerland. This system supports constant flow rate test, a constant pressure test and a pulse test. Through these tests, an extent of hydrologically disturbed zone in EDZ can be identified and the change of hydraulic conductivity can be quantified.
An integrated system for AE/MS monitoring and web-based software for TPMS were developed. TPMS and stressmeters were installed and under measurement in the new URL site. Web-based software can alarm automatically at preset warning levels. An integrated system for AE/MS monitoring will be used in detecting of seismic events with various scales.

목차 Contents

• 제 1 장 연구개발과제의 개요 ...16
• 제 1 절 연구개발 목적 및 필요성 ...18
• 제 2 절 연구개발 내용 및 범위 ...19
• 제 2 장 국내외 기술개발 현황 분석 ...22
• 제 1 절 고심도 지하연구실험실(URL) 및 R&D 활용 ...24
• 제 2 절 저온열균열 현상 이용 지압측정기술 ...31
• 제 3 절 심부 암반 발파손상대 평가기술 ...33
• 제 4 절 수리적 굴착손상영역 측정기술 ...35
• 제 5 절 굴착손상영역 수치해석평가기술 ...36
• 제 6 절 SHPB와 Micro X-ray CT 활용기술 ...37
• 제 3 장 연구개발수행 내용 및 결과 ...40
• 제 1 절 지하연구실험실(URL) 구축 ...42
• 제 2 절 저온열균열현상 이용 지압측정 기법/장치 개발 ...73
• 제 3 절 지반 모델링 기법 및 툴 개발 ...85
• 제 4 절 심부 암반 발파굴착손상대 평가기법 현장적용 ...101
• 제 5 절 수리적 굴착손상영역 투수특성 평가 ...127
• 제 6 절 굴착손상영역 수치해석평가기술 ...154
• 제 7 절 SHPB와 Micro X-ray CT를 활용한 암반파괴과정 요소기술개발 ...173
• 제 8 절 균열암반 열-수리-역학적 연성거동 해석코드 개발 ...191
• 제 4 장 목표달성도 및 관련분야에의 기여도 ...212
• 제 1 절 목표달성도 ...214
• 제 2 절 관련분야에의 기여도 ...215
• 제 5 장 연구개발결과의 활용계획 ...217
• 제 6 장 참고문헌 ...219
• 부록 URL 실험갱도 굴착을 위한 제어발파 설계패턴도 ...226