• Title/Summary/Keyword: 암석물성

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Current Status of Research on Thermal and Mechanical Properties of Rock under High-Temperature Condition (고온 조건하 암석의 열적·역학적 물성에 대한 연구현황)

  • Lee, Changsoo;Park, Jung-Wook;Park, Chulwhan;Park, Eui-Seob
    • Tunnel and Underground Space
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    • v.25 no.1
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    • pp.1-23
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    • 2015
  • In this technical report we summarize the observational data on thermal and mechanical properties of rocks reported by over 70 best published papers. The experimental results reported individually are integrated and presented in tables and figures here, which will provide fundamental data to fairly determine and evaluate the rock properties at the initial design stage of underground structures exposed to high temperature environment.

Rock Mechanics Studies at the KAERI Underground Research Tunnel for High-Level Radioactive Waste Disposal (고준위폐기물 처분연구를 위한 지하처분연구시설에서의 암석역학 관련 연구)

  • Kwon, S.;Cho, W.J.
    • Tunnel and Underground Space
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    • v.17 no.1 s.66
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    • pp.43-55
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    • 2007
  • An underground research tunnel, KURT, was constructed at Korea Atomic Energy Research Institute, for various in situ validation experiments related to the development of a high-level radioactive waste disposal system. KURT, which has length of 255 m (access tunnel 180 m and research modules 75 m) and size of $6m{\times}6m$ was excavated in a cryatalline rock mass. In the KURT project, different rock mechanics studies had been carried out during the concept design, site characterization, detailed design, and construction stages. From the geophysical survey, borehole investigation, and rock property tests in laboratory and in situ, the rock and rock mass properties required for the mechanicsl stability analysis of KURT could be achieved and used for the input parameters of computer simulations. In this paper, important results from the rock mechanics studies at KURT and the three-dimensional mechanical stability analysis will be introduced.

Case Studies of Indirect Coupled Behavior of Rock for Deep Geological Disposal of Spent Nuclear Fuel (사용후핵연료 심층처분을 위한 암석의 간접복합거동 연구사례)

  • Hoyoung, Jeong;Juhyi, Yim;Ki-Bok, Min;Sangki, Kwon;Seungbeom, Choi;Young Jin, Shin
    • Tunnel and Underground Space
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    • v.32 no.6
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    • pp.411-434
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    • 2022
  • In deep geological disposal concept for spent nuclear fuel, it is well-known that rock mass at near-field experiences the thermal-hydraulic-mechanical (THM) coupled behavior. The mechanical properties of rock changes during the coupled process, and it is important to consider the changes into the analysis of numerical simulation and in-situ tests for long-term stability evaluation of nuclear waste disposal repository. This report collected the previous studies on indirect coupled behaviors of rock. The effects of water saturation and temperature on some mechanical properties of rock was considered, while the change in hydraulic conductivity of rock due to stress was included in the indirect coupled behavior.

Analysis of Parameters Affecting LiDAR Intensity on Rock (암석에 대한 라이다 반사강도의 영향 인자 분석)

  • Kim, Moonjoo;Lee, Sudeuk;Jeon, Seokwon
    • Tunnel and Underground Space
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    • v.30 no.4
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    • pp.417-431
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    • 2020
  • In this study, a fundamental investigation was made on how to use LiDAR technology to determine the degree of weathering and alteration of rock mass. The purpose of the study was to identify the affecting parameters to LiDAR intensity and to quantitatively assess the relations among them through laboratory-scale experiment. A few potential affecting parameters were selected including scanning distance, incidence angle, surface roughness, surface color, mineral composition, and water saturation. In the experiment, FARO LiDAR unit was used for twelve different types of specimen. It was observed that the intensity was affected by, in the order of importance, surface color, incidence angle, scanning distance, property of rock, water condition, and surface roughness.

Characterization of Physical Properties for Mineral Exploration of High-grade Limestone in Pungchon Formation (풍촌층 고품위 석회석 광상 탐사를 위한 암석 물성 특성)

  • Shin, Seung Wook;Park, Samgyu;Cho, Seoung-Jun
    • Geophysics and Geophysical Exploration
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    • v.20 no.3
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    • pp.137-145
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    • 2017
  • High-grade limestone applied to various chemical industries is abundant within upper Pungchon formation in Taebaeksan basin, South Korea. Geophysical exploration is one of the most efficient methods to investigate subsurface geological structure in an extensive area. Since the geophysical exploration for the high-grade limestone has rarely been conducted in Korea, its appropriate strategy has not been set up yet. In this study, we focused on to suggest the reasonable strategy and accumulate geophysical databases which are essential for interpreting geophysical images by characterizing laboratory physical properties of in-situ rocks. Hence, rocks were obtained from drilled cores consisting of lower Hwajeol formation, Pungchon formation, and dykes in Jeongseon area, Gangwon province. Geophysical laboratory experiments and petrography of the rocks were conducted. Since susceptibility values of the rocks in Pungchon Formation were obviously lower than those of upper Hwajeol and dykes, it is considered that the lithological boundaries could be distinguished by magnetic survey. In addition, electrical properties of the rocks in middle Pungchon formation were relatively different compared with those of upper/lower Pungchon formations. Thus, induced polarization is shown to be able to detect the high-grade limestone in upper Pungchon formation.

A study on the Change of Uniaxial Compressive Strength and Young's Modulus According to the Specimen Size of Intact Material (무결함 재료의 크기에 따른 강도와 탄성계수의 변화에 관한 연구)

  • Lee, Seung-Woo;Song, Jae-Joon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.8 no.3
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    • pp.205-217
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    • 2006
  • Rock and discontinuities are main factors consisting of a rock mass and the physical properties of each factor have direct effects on the mechanical stability of artificial structures in the rock mass. Because physical properties of the rock and discontinuities change a lot according to the size of test materials, a close attention is needed when the physical properties, obtained from laboratory tests, are used for the design of field structures. In this study, change of physical properties of intact materials due to the change of their size are studied. Six kinds of artificial materials including crystal, instead of an intact rock, are adopted for the study to guarantee the homogeneity of specimen materials even with relatively large size. Uniaxial strength and Young's modulus of each artificial material are checked out for a size effect and compared with the predicted values by Buckingham's theorem - dimensional analysis. A numerical analysis using PFC (Particle Flow Code) is also applied and primary factors influencing on the size effect are investigated.