Thermal conductivity of thermally damaged Beishan granite under uniaxial compression

Published on Mar 1, 2019in International Journal of Rock Mechanics and Mining Sciences4.151
· DOI :10.1016/J.IJRMMS.2019.01.014
Xingguang Zhao14
Estimated H-index: 14
Haoran Xu4
Estimated H-index: 4
(THU: Tsinghua University)
+ 3 AuthorsJ. Wang9
Estimated H-index: 9
(China National Nuclear Corporation)
Abstract Investigations of the thermal conductivity of thermally damaged Beishan granite under uniaxial compression were conducted. Rectangular prism specimens preconditioned at 105 °C were heated at different temperatures (400, 550 and 650 °C) and then cooled to room temperature (27 °C) for testing. Using the transient plane source (TPS) method, in combination with a servo-controlled compression machine and an acoustic emission (AE) monitoring system, lateral thermal conductivities, stress–strain relations and AE responses of the thermally treated specimens during uniaxial compression were measured. The effects of thermal treatment temperature on the strength, deformation and AE parameters were analyzed. The lateral thermal conductivity evolution characteristics for the specimens in the deformation process were studied. The stress-and-deformation-dependent lateral thermal conductivities were also evaluated. The experimental results indicate that the lateral thermal conductivity varies nonlinearly with increasing axial stress due to closure, initiation and propagation of microcracks within the specimens. Moreover, significant differences exist in the lateral thermal conductivity behaviors between the specimens subjected to different temperature treatments. Furthermore, to reveal the influence of cracking behaviors on the thermal conductivity of the thermally damaged specimens in compression, numerical modeling was performed using PFC and the simulation results agree well with the experimental data.
📖 Papers frequently viewed together
68 Citations
42 Citations
#1Ju Wang (China National Nuclear Corporation)H-Index: 6
#2Liang ChenH-Index: 11
Last. Xingguang Zhao (China National Nuclear Corporation)H-Index: 14
view all 4 authors...
With the rapid development of nuclear power in China, the disposal of high-level radioactive waste (HLW) becomes an important issue for nuclear safety and environment protection. Deep geological disposal is internationally accepted as a feasible and safe way to dispose of HLW, and underground research laboratories (URLs) play an important and multi-faceted role in the development of HLW repositories. In this paper, the overall planning and the latest progress for China’s URL are introduced. Base...
72 CitationsSource
Granitic rocks are potential rock types for hosting high-level radioactive waste (HLW) repositories at depth. A better understanding of rock thermal conductivity is essential to develop HLW repositories successfully. In this work, experimental investigations on the thermal conductivity of thermally treated Beishan granite were conducted. Disk specimens preconditioned at 105 °C were heated to different temperatures (200, 300, 400, 550, 650, and 800 °C) and then cooled to room temperature for test...
26 CitationsSource
#1Fan Zhang (CAS: Chinese Academy of Sciences)H-Index: 4
#2Zhao Jianjian (HBUT: Hubei University of Technology)H-Index: 2
Last. Jian-Fu Shao (HBUT: Hubei University of Technology)H-Index: 52
view all 5 authors...
High-temperature treatment may cause changes in physical and mechanical properties of rocks. Temperature changing rate (heating, cooling and both of them) plays an important role in those changes. Thermal conductivity tests, ultrasonic pulse velocity tests, gas permeability tests and triaxial compression tests are performed on granite samples after a heating and rapid cooling treatment in order to characterize the changes in physical and mechanical properties. Seven levels of temperature (from 2...
89 CitationsSource
#1Zhihong Zhao (THU: Tsinghua University)H-Index: 20
#2Zhina Liu (China University of Petroleum)H-Index: 3
Last. Xue Li (THU: Tsinghua University)H-Index: 1
view all 4 authors...
42 CitationsSource
#1Fengjuan Chen (University of Lorraine)H-Index: 7
#2Yuri Popov (Skolkovo Institute of Science and Technology)H-Index: 7
Last. Dragan Grgic (University of Lorraine)H-Index: 16
view all 6 authors...
Abstract We focus on derivation and experimental verification of the replacement relations that link the overall thermal conductivities of heterogeneous materials with the same matrix and microstructure but having inhomogeneities with different properties. First, we derive replacement inequalities based on Hashin-Shtrikman bounds that relate overall thermal conductivity of a composite to thermal conductivity of a.porous material. Hashin-Shtrikman bounds are also used to derive analogy of Gassman...
13 CitationsSource
#1Pingye Guo (CUMT: China University of Mining and Technology)H-Index: 7
#2N. ZhangH-Index: 1
Last. B.H. Bai (CUMT: China University of Mining and Technology)H-Index: 1
view all 4 authors...
Abstract The thermal conductivity of porous media is crucial for many geological and engineering projects. Although the thermal conductivity at low temperatures is often overlooked, it is of great significance to calculate the amount of heat that the ice sheet absorbs from the Earth. In this study, the thermal conductivity of dry and water-saturated sandstone was measured in the temperature range of 193 to 373 K using a transient hot wire method. All samples were collected from East China, with ...
12 CitationsSource
#1Katharina Albert (TUM: Technische Universität München)H-Index: 2
#2Marcellus Schulze (EA: Environment Agency)H-Index: 1
Last. Kai Zosseder (TUM: Technische Universität München)H-Index: 5
view all 5 authors...
The study presents the statistical data of the effective thermal conductivity (λe) of sandstones, mudstones, and marlstones from Bavaria, Germany. The measurements were conducted by the Thermal Conductivity Scanner (TCS) for dry and water-saturated conditions at an ambient temperature and pressure. High variation in the λe of sandstones is a result of the variation in matrix and pore properties. In general, the λe increases because of water saturation. However, dissolving clay mineral found duri...
21 CitationsSource
#1Xingguang Zhao (China National Nuclear Corporation)H-Index: 14
#2J. Wang (China National Nuclear Corporation)H-Index: 9
Last. Y.M. LiuH-Index: 1
view all 7 authors...
Abstract Crystalline rocks are potential host rock types for the construction of high-level radioactive waste (HLW) repositories. A better understanding of thermal conductivity of rocks is essential to safe evaluation and engineering optimization of a HLW disposal system in the rock at depth. In the present study, experimental investigations on the thermal conductivity characteristics of 47 pairs of granitic rock specimens were conducted using the Transient Plane Source (TPS) method. The specime...
41 CitationsSource
The particle mechanics method is used to simulate the process of thermally induced micro- and macrocracks in granite, to elucidate the mechanisms responsible for temperature-dependent mechanical properties. The numerical results are quantified and compared with existing results from other experimental data in the literature. The results indicate that heating generally reduces the compressive and tensile strengths of granites, first because of increasing thermal stresses, and second because of th...
82 CitationsSource
#1Alexander Urquhart (SNL: Sandia National Laboratories)H-Index: 4
#2Stephen J. Bauer (SNL: Sandia National Laboratories)H-Index: 11
The thermal properties of halite have broad practical importance, from design and long-term modeling of nuclear waste repositories to analysis and performance assessment of underground natural gas, petroleum and air storage facilities. Using a computer-controlled transient plane source method, single-crystal halite thermal conductivity, thermal diffusivity and specific heat were measured from -75°C to 300°C. These measurements reproduce historical high-temperature experiments and extend the lowe...
16 CitationsSource
Cited By18
#1Fangchao Kang (DUT: Dalian University of Technology)H-Index: 1
Last. Xin Huang (DUT: Dalian University of Technology)
view all 6 authors...
Abstract null null Geothermal energy arrested in HDR (hot dry rock) is commonly harvested from the reservoir fractured by artificial stimulations. Understanding the physical and mechanical behaviors of HDR after different cooling treatments is critical for selecting most efficient fluid to fracture the rock mass. Here we experimentally examine the physical and mechanical variations of a typical type of HDR, granite, after natural, water, and liquid-nitrogen cooling treatments, followed by a mult...
#1Jun Peng (CSU: Central South University)
#2Tang Zhicheng (China University of Geosciences (Wuhan))H-Index: 12
Last. Di Hou
view all 3 authors...
Abstract null null Strength behavior of thermally-damaged rock is quite different from that of undamaged or intact rock. In this study, a concept of degradation of geological strength index (GSI) is used and a GSI-softening model in the framework of generalized Hoek-Brown (H B) failure criterion is proposed to characterize the strength behavior of thermally-damaged rock. The proposed GSI-softening model is then verified using several sets of test data collected from previous publications. It is ...
1 CitationsSource
#1Fangchao Kang (DUT: Dalian University of Technology)H-Index: 1
#2Yingchun Li (DUT: Dalian University of Technology)H-Index: 12
Last. Chunan Tang (DUT: Dalian University of Technology)H-Index: 20
view all 3 authors...
Abstract null null null null Deep null geological repository null is usually constructed in a typical null null crystalline rock null null , null granite null . Therefore, comprehensive understanding on the thermo-mechanical properties of granite exposed to high temperature is crucial to repository design and risk assessment. Granite experiences a transition from strengthening to weakening as temperature increases; however, the critical temperature at which this transition occurs is still poorly...
2 CitationsSource
#1Chengzeng Yan (China University of Geosciences (Wuhan))H-Index: 14
#2Yu Yang (China University of Geosciences (Wuhan))H-Index: 1
Last. Gang Wang (HKUST: Hong Kong University of Science and Technology)H-Index: 93
view all 3 authors...
Abstract null null This paper proposes a new 2D continuous-discontinuous heat conduction model to simulate heat transfer and thermal cracking in fractured quasi-brittle materials by combining with mechanical calculations of the Finite-Discrete Element Method. By updating the sharing relationship of the nodes at the cracks, the model can accurately predict the temperature evolution, crack propagation and considers the effect of cracking on heat conduction. We verified the correctness of the conti...
1 CitationsSource
#1Roberto Tomás (University of Alicante)H-Index: 29
#2Miguel Cano (University of Alicante)H-Index: 11
Last. Graça Vasconcelos (University of Minho)H-Index: 19
view all 7 authors...
Abstract null null This work discusses the results from a set of physical and mechanical test conducted on 46 cubic samples of a granite from the north of Portugal widely used in local granite-built UNESCO World Heritage, heated in a furnace at temperatures ranging from 105 to 700o C and cooled under different conditions. Then, the obtained results are compared with an extensive database of published case studies, showing that porosity, unit weight, ultrasonic waves velocities, elastic modulus a...
1 CitationsSource
#1Yun Wu (NU: Nanjing University)H-Index: 5
#2Xiao-zhao Li (CUMT: China University of Mining and Technology)H-Index: 1
Last. Sen Xue (NU: Nanjing University)H-Index: 1
view all 4 authors...
The study of the influence of temperature on granite's physical and mechanical properties is significant to deep geotechnical engineering such as nuclear waste disposal engineering. The granite samples were taken from Beishan of Gansu Province, China, a candidate site for a high-level radioactive waste repository. In this paper, thermal damage on Beishan granite under different temperature (25 °C, 200 °C, 300 °C, 400 °C, and 500 °C) was studied to investigate the thermal effect on physical and m...
4 CitationsSource
#1Song Wang (CAS: Chinese Academy of Sciences)H-Index: 3
#2Jian Zhou (Beijing University of Technology)
Last. Fenxiang ZhangH-Index: 1
view all 5 authors...
The grain-based model (GBM) in two-dimensional Particle Flow Code (PFC2D) is widely used to simulate the deformation and brittle failure of crystalline rocks. However, the original GBM consisting of the parallel-bond (PB) and the smooth-joint (SJ) produces unrealistic micro-cracking processes in which excessive microcracks are distributed along the interfaces of mineral grains under uniaxial loading. To solve the problem, this research presents a discussion of the mechanical behavior of six GBMs...
#1Dong Zhou (Tongji University)H-Index: 2
#2Zhihong Zhao (THU: Tsinghua University)H-Index: 20
Last. Wenqi Ding (Tongji University)H-Index: 13
view all 5 authors...
Abstract Fractures in rock masses not only are main flow conduit for groundwater, but also provide planes of weakness on which further displacement can more readily occur. Grouting has been widely used to reduce the permeability of fractured rocks, as well as to improve the stability of fractured rocks. Therefore, fractures infilled with grout appear extensively in practice, and may be subjected to different in-situ stress conditions during the construction and operation life of tunnels and unde...
1 CitationsSource
#1Zhijun Wu (WHU: Wuhan University)H-Index: 19
#2Yuan ZhouH-Index: 1
Last. Yang Xiao (Chongqing University)H-Index: 38
view all 5 authors...
In this study, a 3D coupled FEM-DEM method was adopted to study the influence of thermal-induced damage on the mechanical properties of fractured rock mass. In this method, the rock matrix was discretized into bulk elements bridged by cohesive elements, and the preexisting fractures were represented by cohesive elements. The thermal-induced damage process was modeled through two parts, i.e., thermal conduction and thermal-mechanical coupling. For thermal conduction process, a proposed 3D thermal...
5 CitationsSource
#1H. Lin (UNSW: University of New South Wales)H-Index: 3
#2Won-Hee Kang (USYD: University of Sydney)H-Index: 14
Last. Bruce Hebblewhite (UNSW: University of New South Wales)H-Index: 19
view all 5 authors...
Abstract Estimation of horizontal stress magnitudes from borehole breakouts has been an attractive topic in the petroleum and mining industries, although there are critical research gaps that remain unfilled. In this paper, numerical simulation is conducted on Gosford sandstone to investigate the borehole breakout and its associated borehole size effect, including temperature influence. The discrete element method (DEM) model shows that the borehole breakout angular span is constant after the in...
7 CitationsSource