20 Result(s)
within
Mingzhong Gao
Earth Sciences
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Article
Micro-mechanical Properties of Main Rock-Forming Minerals in Granite Under Microwave Irradiation
Currently, the large-scale crushing technology for high-strength hard rock is struggling to meet the increasing construction demand for deep underground engineering. Although microwave-coupled mechanical rock ...
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Article
Nonlinear Mechanical and 3D Rupture Morphology of Saturated Porous Sandstone Under True Triaxial Stress
In deep underground geotechnical engineering, water–rock interaction emerges as a critical factor influencing the stability of engineering rock masses. This study delves into the macroscopic nonlinear mechanic...
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Article
Mechanical Behaviors of Segments in Small Curvature Radius Intervals of Shield Tunnels: From Field Monitoring to Laboratory Testing
Shield tunnels, especially those with small curvature radii, are currently used in the construction of underground rail transit, and they provide important support for the future development and utilization of...
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Article
Assessing the Size Effect on Microwave Fracturing of Diorite Using a Dielectric-Loaded Converging Waveguide Antenna
Microwave fracturing and assisted mechanical breakage of rocks has been demonstrated to be efficient and cost-effective, holding great potential in rock excavation. However, the size effect on the fracturing p...
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Article
Analytical Solutions for the Characteristic Size Distribution of the Elliptical Model in Fractured Rock Mass
Fracture characteristics have a significant effect on the mechanical and hydraulic properties of rock mass. In this paper, before modeling a discrete fracture network, the fracture is simplified as a non-simil...
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Article
Fracture Mechanisms of Competent Overburden Under High Stress Conditions: A Case Study
High-intensity longwall top coal caving (LTCC) mining of super-thick coal seam in high stress conditions often leads to significant movement and failure of overburden. The competent roof above the super-thick ...
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Article
Contributory Factors and Distribution Characteristics of Asymmetric Deformation in Deep Tunnel
Aiming at the asymmetric deformation of the surrounding rock in deep tunnels, from the perspective of the mechanical environment of the rock layer, the physical characteristics of the surrounding rock and the ...
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Article
Experimental and Numerical Study of the Influence of Prefabricated Crack Width on the Fracture Toughness of NSCB Specimens
The accuracy measurement of rock fracture toughness is one of the basic tasks of rock fracture mechanics. In order to study the influence of the width of the prefabricated crack on the fracture toughness of ro...
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Article
Permeability-enhanced rate model for coal permeability evolution and its application under various triaxial stress conditions
Knowledge on permeability enhancement is of great significance for the exploitation of coalbed methane, shale gas, and tight gas. In this study, the volumetric strain of rocks is considered to be one of the mo...
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Article
Acoustic Emission Characteristics and Damage Evolution of Coal at Different Depths Under Triaxial Compression
To obtain a comprehensive understanding of the difference between deep and shallow rocks, and the damage evolution laws of a rock mass at different depths, a case study was conducted on the **dingshan Coal M...
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Article
Energy Evolution of Coal at Different Depths Under Unloading Conditions
To explore the differences in deformation failure and energy evolution and simulate the real excavation conditions of coal masses at different depths during the coal-mining process, an unloading failure experi...
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Article
Determination of the Dynamic Propagation Toughness of Marble Based on a Fractal Propagation Model and an Experimental–Numerical–Analytical Method
Precracked chevron-notched Brazilian disc specimens were impacted by a split Hopkinson pressure bar to determine the dynamic propagation toughness of marble. The dynamic expansion process of the crack was meas...
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Article
Study on the Mechanical Properties and Mechanical Response of Coal Mining at 1000 m or Deeper
As shallow coal resources are gradually depleted, resource exploitation extends from the shallow into the deep, where the mechanical properties of the coal rocks change significantly. To study the mechanical p...
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Article
Deformation Damage and Energy Evolution Characteristics of Coal at Different Depths
As coal mining is extended to greater depths, it is found that the mechanical behavior of deep coal differs from the mechanical behavior of shallow coal, resulting in a significant increase in accidents. To ex...
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Article
The Location Optimum and Permeability-Enhancing Effect of a Low-Level Shield Rock Roadway
High (low)-level roadways are effective gas control measures for coal seams with high outburst potential and low permeability. The spatial location of the low-level roadway directly determines the gas drainag...
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Article
Mining-Induced Coal Permeability Change Under Different Mining Layouts
To comprehensively understand the mining-induced coal permeability change, a series of laboratory unloading experiments are conducted based on a simplifying assumption of the actual mining-induced stress evolu...
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Article
Lessons Learnt from Measurements of Vertical Pressure at a Top Coal Mining Face at Datong Tashan Mines, China
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Article
Elliptical fracture network modeling with validation in Datong Mine, China
Roof-coal recovery rate and the performance of gas extraction are essentially controlled by the fractures within coal-rock mass. Thus, it is important to generate the accurate fracture network ahead of mining ...
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Article
Theoretical and experimental validation of mining-enhanced permeability for simultaneous exploitation of coal and gas
Simultaneous recovery of coal and methane is a promising solution for making reasonable use of energy resources and preventing gas disasters. Coal mining produces an effect that enhances the permeability of co...
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Article
The relationships among stress, effective porosity and permeability of coal considering the distribution of natural fractures: theoretical and experimental analyses
Although the relationships among stress, effective porosity and permeability of coal are a fundamental research topic that has been studied for decades and are widely used in analyzing the mechanical behavior ...
