The mechanism of microwave rock breaking and its potential application to rock-breaking technology in drilling

Gao, Mingzhong; Yang, Bohan; Xie, Jing; Ye, Siqi; Liu, Junjun; Liu, Yiting; Tang, Ruifeng; Hao, Haichun; Wang, Xuan; Wen, Xiangyue; Zhou, Xuemin

doi:10.1016/j.petsci.2021.12.031

Cited by 80 publications

(26 citation statements)

References 45 publications

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“…(1) Fluid flow and heat transfer are steady state (2) The rock sample is considered to be impermeable (3) The water flow is laminar (4) Viscous and incompressible fluid (5) Heat transfer by radiation is not considered (6) There is no dissolution or precipitation between water and rocks (7) No additional heat source and heat loss A single-phase fluid flow in fractures is governed by the mass continuity equation (Equation ( 1)) and the Navier-Stokes equation (Equation ( 2)) [21], as given by…”

Section: Theory Backgroundmentioning

confidence: 99%

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Numerical and Analytical Study of Fluid Flow and Thermal Transfer in a Rough Fracture

2022

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The surface morphology of rough fractures significantly affects the fluid flow and heat transfer characteristics in the fractures. A thermal-flow coupling model with specific geometric fractures was established to investigate the influence of surface morphology on the heat transfer characteristics of a single fracture. The effect of temperature on the physical properties of rocks and fluids was included in the study to reflect the actual situation more realistically. The research results show that the temperature of the fluid in the rough fracture is nonlinearly distributed along the flow direction and the higher the flow velocity, the higher the heat transfer efficiency. The fracture surface morphology has a significant impact on the heat transfer characteristics, and the surface fluctuation will greatly affect the flow velocity, causing the fluid temperature to change abruptly at the fracture surface. Under the same flow rate, with the increase of the fluctuation degree of the fracture surface and the fluctuation frequency, the larger the heat exchange area of the fracture surface, the stronger the heat exchange performance. The heat transfer efficiency of the fracture is directly related to the heat transfer area of the fracture, so even with the same permeability, the heat transfer performance of fractures with different surface topography is different.

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Section: Theory Backgroundmentioning

confidence: 99%

“…Continuous exploration and development of deep earth extended resources has become a common phenomenon [1][2][3]. The development and utilization of hot dry rock geothermal resources with huge reserves, clean and unaffected by climate within 3-10 km below the surface, have attracted much attention at present [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Analytical Study of Fluid Flow and Thermal Transfer in a Rough Fracture

2022

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“…Under engineering disturbance, the instability and failure of the coal body are promoted by the initiation, expansion, interaction, and penetration of defects [1][2][3][4]. The complex fracture structure impacts coal deformation and failure [5][6][7][8]. The nonuniform distribution and expansion evolution of fractures lead to variations in the permeability and mechanical characteristics of the coal body [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Fracture Evolution Law of Coal Based on Image Retrieval Method and X-Ray Computed Tomography

Wang

Pang

et al. 2022

Geofluids

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The combination of real-time computed tomography (CT) scanning test and loading test can visualize the evolution process of defects such as internal pores and fissures in the coal. The axial deformation of the loaded coal sample will change the layers of the same section in the real-time CT scanning test, which will affect the analysis of fracture progression. To address the concern, we presented a CT image similarity retrieval method. The dynamic development law of fracture networks under triaxial stress was investigated using image processing technologies. The results reveal that the CT images of the coal sample in the same section can be obtained using the proposed CT image similarity retrieval method, which can more accurately characterize the fracture distribution and dynamic evolution law. The coal sample under triaxial stress experienced three fracture evolution stages: the closure in the compaction and elastic stages, the initiation and development in the plastic yield stage, and the rapid expansion and penetration in the postpeak stage. The variation trend of two-dimensional fracture ratio and fracture volume was consistent. The analysis is conducive to clarifying the coal failure mechanism under triaxial stress.

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“…erefore, the study on the corresponding mechanical properties of rock [30][31][32], the development and evolution of karst, the formation mechanism of karst collapse, the stability of karst sites, and their prevention and control is of great importance to the housing construction sector in the Mudengdong village. is provides a theoretical basis for the selection of the housing site.…”

Section: Introductionmentioning

confidence: 99%

Genesis Analysis and Stability Evaluation of Karst Area in the Mudengdong Village Based on the Geological Investigation and Numerical Simulation Methods

Liu

et al. 2022

Shock and Vibration

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The large-scale mining of underground mineral resources will lead to the formation of mined-out areas, which will lead to a series of geological and environmental problems. By selecting the Mudengdong village as a case study, this paper uses geodetic satellite remote sensing technologies to perform qualitative analyses and summarize the geological engineering conditions of the factory. Afterwards, the predominant factors that affect the stability of foundation are determined based on the geological survey of karst in goaf structures. Finally, the finite element software ANSYS is used to comprehensively study the karst problem. The results indicate that (1) the karst development pattern in the study area is controlled by the Beiyin mountain fault, in which case the karst in the basin, in the foot slope, or in the pass section is more widespread than in the slope section. Moreover, the karst generally has a vertical form and is in the early karst stage of development; (2) surface rainwater infiltration, earthquakes, and load pressure are the three major factors that affect karst collapse in the study area; (3) by simulating the development of karst caves and the bearing capacity of the karst roof in the goaf structure under different conditions, it is recommended that only civil buildings with not more than three floors can be built in the village. Overburdened soil thicknesses between 6 and 10 m and civil buildings with heights less than 6 m are not suitable parameters for construction activities. If there are hidden soil holes under the overburden layer, dynamic consolidation needs to be applied in order to destroy the structure of the soil layer and to ensure the safety of personnel.

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The mechanism of microwave rock breaking and its potential application to rock-breaking technology in drilling

Cited by 80 publications

References 45 publications

Numerical and Analytical Study of Fluid Flow and Thermal Transfer in a Rough Fracture

Numerical and Analytical Study of Fluid Flow and Thermal Transfer in a Rough Fracture

Study on the Fracture Evolution Law of Coal Based on Image Retrieval Method and X-Ray Computed Tomography

Genesis Analysis and Stability Evaluation of Karst Area in the Mudengdong Village Based on the Geological Investigation and Numerical Simulation Methods

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