A5066924052- Geomechanics and Mining Engineering
- Rock Mechanics and Modeling
- Geoscience and Mining Technology
- Geotechnical and Geomechanical Engineering
- Coal Properties and Utilization
- Geotechnical Engineering and Underground Structures
- Hydrocarbon exploration and reservoir analysis
- Drilling and Well Engineering
- Landslides and related hazards
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Structural Response to Dynamic Loads
- Methane Hydrates and Related Phenomena
- Geophysical Methods and Applications
- Structural Behavior of Reinforced Concrete
- Cultural Industries and Urban Development
- Mechanical Failure Analysis and Simulation
- Advanced Sensor Technologies Research
- Hydrogen embrittlement and corrosion behaviors in metals
- Optical Polarization and Ellipsometry
- Evaluation and Optimization Models
- Photonic and Optical Devices
- Grouting, Rheology, and Soil Mechanics
- Optical Coatings and Gratings
- Welding Techniques and Residual Stresses
Liaoning Technical University
2015-2024
China University of Mining and Technology
2019-2023
China National Petroleum Corporation (China)
2011-2021
China Coal Research Institute (China)
2020
Shanxi Jincheng Anthracite Mining Group (China)
2013
University of Wollongong
2013
Shanxi Coal Transportation and Sales Group (China)
2012
Kailuan General Hospital
2011
Xinjiang University
2008
Shandong University
2007
Abstract We report laboratory experiments to investigate the dynamic failure characteristics of outburst‐prone coal using a split Hopkinson pressure bar (SHPB). For comparison, two groups are completed on contrasting coals—the first and second outburst‐resistant. The mechanical properties, processes, energy dissipation both outburst‐resistant coals comparatively analyzed according obtained compressive tensile stress‐strain curves. Results show that response specimens comprises stages...
Coal burst has become a worldwide problem that needs to be solved urgently for the sake of coal mine safety production due its complicated triggering mechanisms and numerous influencing factors. The risk assessment disasters is particularly critical. In this work, 15 factors affecting occurrence are selected from perspectives geodynamic environment geological mining conditions, influence mechanism each factor on bursts analyzed. An evaluation index system put forward. A hierarchical model...
Abstract Coal and gas outburst is a complex dynamic disaster during coal underground mining. Revealing the mechanism of great significance for accurate prediction prevention outburst. The geo-dynamic system proposed. framework composed gassy mass, geological environment mining disturbance. Equations stress–damage–seepage interaction mass constructed to resolve elimination process by extraction with boreholes through layer in floor roadway. results show occurrence divided into evolution...
Rock bolting has firmly used as the coal mine roof reinforcement in underground mine. The effect of fully grouted rebar bolt is closely related to surface profile. This paper provides an experimental study confirm that rib internal length great influence on effect. Pull-out tests were conducted using with different spacings 12, 24, 36 and 48 mm representatively from steel tube concrete. Results show peak load increases 25.3% for large spacing. For pull out concrete block, increment between...
Different from the conventional gas reservoir, coalbed methane is developed mainly by water drainage, which leads desorption after reservoir pressure drop. Water drainage at a reasonable speed in early development stage key for enhancing later performance. Therefore, investigation radius, reflects drop region scale, studied deconvolution well-test to find period. First, production data (well-bottom and rate) are processed algorithm, then under unit rate obtained invert comprehensive...
Abstract Fissured coal mass under triaxial unloading condition exhibits higher burst potential than the loading condition, which poses challenge to safety and productivity of resources extraction underground space utilization. To comprehensively understand mechanism unloading-induced during excavation process, this study investigated fracture energy evolution samples with different fissure types such as single, two parallel, coplanar-parallel using PFC 2D modelling. Triaxial tests were...
In underground coal mines, fibre reinforced polymer (FRP) bolt is ideal for mined rib reinforcements as it can prevent gas explosions caused by shearer frictional spark. With increasing mining depth, small diameter FRP bolts used in shallow cannot fulfil the support requirements. Under engineering background of deep shortwall Wudong mine, this paper systematically studies Φ27 mm large deformation rib. Specimens with a fan-shaped cross-section were to enable tensile testing rod, measured...
The fully mechanized top-coal caving mining method was used to mine the 15 m thick No. 3–5 seam at a depth of 450 in Tongxin mine, located Datong area, China. overlain with strong strata that are hard cave and four partially mined coal seams. Excessive roadway closure severe ground conditions longwall face tailgate were induced by periodic weighting remnant pillars left seams above. These studied using physical modelling microseismic monitoring. results indicated rock above did not readily,...
This paper presents a mechanical model for sheared rock joints using microstructural analysis of asperity damage. The shear resistance the joint is formulated as function geometry joint, Mohr–Coulomb properties materials and loading levels. Deformation can be classified slip at faces, partial complete shearing off asperity. theoretical implications developed have also been corroborated by relevant experimental data in literature.
In the extra-thick coal seams and multi-layered hard roofs, longwall hydraulic support yielding, face spalling, strong deformations of goaf-side entry, severe ground pressure dynamic events typically occur at top caving faces.Based on Key strata theory an overburden model is proposed here to predict multilayered behaviour.The together with measured stress changes in seam underground observations Tongxin mine provides a new idea analyse help minimise rock bursts ground.Using primary sub-Key...
This paper documents a study carried out to formulate the rib bearing angle in initial bond stress–slip for deformed reinforcing bars under axial loading. An analytical approach is proposed that utilises conventional Mohr–Coulomb material properties. A universal maximum stress formulated as complementary of internal friction surrounding concrete. For given bar, can be narrowed down further. equation estimation most possible function properties and confinement level. The results presented...
Rockbursts are the sudden release of accumulated energy in surrounding rock roadway and stope. Current studies on rockburst mechanism primarily focused underground mining space activities, whereas efforts have rarely been regional geological dynamics. Mining activities areas accumulation under influence dynamics can easily cause mine dynamic disasters such as rockburst. The paper statistically analysed relationship between environment factors (mining depth, tectonic stress, vertical crust...
The longwall mining method with gob-side entry retaining via roof cutting is a new underground coal which has the characteristics of high resource recovery ratio and environmental friendliness. Due to complexity this method, research case-based dynamic on-site monitoring, analysis, adjustment, optimization usually adopted. Based on roadway project, in addition traditional indirect monitoring hydraulic support pressure, study innovatively establishes direct for caving by gangue pressure goaf,...
Rock burst induced by mining is one of the most serious dynamic disasters in process coal mining. The mechanism a rock similar to that natural earthquake. It difficult accurately predict “time, space, and strength” burst, but possibility can be predicted based on results microseismic monitoring. In this paper, system under tectonic stress field established practice result mine ground crustal measurement. According magnitude monitoring, amount energy spatial position are determined. Based...
Coal seams ascending mining technology is very significant, since it influences the safety production and liberation of dull coal, speeds up construction energy, improves stability stope, reduces or avoids deep hard rock induced mine disaster. Combined with Xiaoming 4-1, by numerical calculation, paper analyses 4-1 factors, determines feasibility coalbed, proposes roadway layout program about working face, which has broad economic social benefits.
Abstract In multiple-seam mining, severe deformation of roadways and coal bursts caused by overlying pillars can occur in the lower seams. Overburden movement ground pressure behaviour when mining thick seam below strong roof upper four extracted seams were investigated Tongxin mine, China. The numerical model indicated that abutment stress is affected as suggested bubble cantilever beam models. microseismic monitoring high-energy seismic events large overburden under source dynamic loads....
Coal bump seriously threatens the safe and efficient mining of coal, research on occurrence mechanism coal is great significance. The roadway accounts for 86.8% total. in gateroad summarized. It considered that hard roof are geological characteristics bump, sliding instability rib mass failure bump. Based elastic foundation theory, upward deflection front lateral working face under condition analyzed, compared with engineering practice rebounding. Taking as object, unloading mechanical model...
Thin spray-on liner (TSL) is a surface protection technology used by spraying polymer film, which widely for mine airtightness and waterproofing. A reinforcing TSL can replace steel mesh, new method roadway support. This paper reviews the development of TSL. Considering deterioration geological conditions in deep underground mining demand automation, two kinds polymeric (RPTSL) materials are developed. The mechanical characteristics studied experimentally. Results show that average...