China Coal Technology and Engineering Group Corp (China)

Study on the fracture characteristics controlled by filling ratio in cut-and-fill mining

To mitigate surface subsidence and stope instability induced by an insufficient filling ratio in cut‑and‑fill mining, this study investigates overlying strata fracture characteristics and instability mechanisms by means of similar material simulation, PFC numerical modeling, and...

Fine Assessment of Water Abundance and Water Inflow Potential in Coal-Bearing Strata Based on Water Storage Space Microelements

Abstract Mine water inflow is one of the primary hazards threatening the safety of coal-mining production. Groundwater in coal-bearing strata serves as the direct water-filling source for coal mining, and its water abundance significantly impacts the intensity of the mine water i...

A Study on the Enhanced Longitudinal Resolution in Radio-Electromagnetic Wave Transillumination Detection

Based on the governing equations of the electromagnetic radiation field and the theory of multi-layer media propagation, the governing equations for electromagnetic wave attenuation are derived. A stable solution to the resulting large-scale sparse linear system is obtained using...

Frequency-decoupled dynamic graph learning with degradation prior for robust state-of-health estimation of lithium-ion batteries

State-of-health (SOH) estimation of lithium-ion batteries is critical for reliable battery management in energy storage systems, where SOH must be inferred from noisy multi-frequency health indicators under varying operating conditions. Existing methods often fail to decouple mul...

Competitive Behavior of Polar and Nonpolar Shale Oil During CO2-Induced Mobilization in Water-Bearing Nanopores

Abstract The efficiency of CO2-enhanced oil recovery (EOR) in shale reservoirs is critically influenced by formation water and the complex chemistry of the crude oil. However, the roles of components in shale oil and its underlying mechanisms are lacking. In this work, molecular...

Multi-scale fracture network simulation and stimulated reservoir volume evaluation of multi-stage fractured horizontal wells in low-permeability coal reservoirs based on physics-enhanced deep operator learning

Prediction of hydraulic-fracture growth and evaluation of stimulated reservoir volume (SRV) are important for optimising multi-stage fracturing in low-permeability coal reservoirs, where geological heterogeneity and inter-stage interference make repeated numerical analysis expens...

Experimental investigation and theoretical modeling of gas expansion energy during coal and gas outburst based on multi-source emission

Coal and gas outbursts are severe dynamic disasters in underground mining, primarily driven by gas expansion energy. However, accurately quantifying this energy remains challenging due to the complex, instantaneous, and multi-source nature of gas emissions. This study proposes a...

Influence of wall microstructure on turbulent heat transfer and thermo-hydraulic performance in heat exchange pipes

Abstract The design of wall structures in heat-exchange pipelines is a key enabling technology for achieving high-efficiency and low-resistance heat-transfer performance. In this study, numerical simulations based on the open-source CFD code OpenFOAM are performed to systematical...

Microscopic interactions and wetting behavior at the micro/nano-bubble water-coal interface: experiments and molecular simulations

Coal seam water injection is a key technology for pre-wetting and dust suppression prior to mining, with its effectiveness largely dependent on the wetting capability of water on coal. As a novel wetting medium, micro-nano bubble water (MNBW) has drawn increasing attention due to...

A Bibliometric Review of Chinese Research on Coal Spontaneous Combustion Inhibitors in Years 1990–2025

To better understand the research status and development trends of coal spontaneous combustion inhibitors in China, this study uses CiteSpace to conduct a bibliometric analysis of relevant literature from the CNKI database (1990–2025). The analysis covers publication trends, inst...

Experimental Investigation and Response Surface Optimization of Fiber-Reinforced Polymer Concrete for Mining Roadway Support

The escalating intensity and depth of coal mining operations have exacerbated underground strata pressure, resulting in fracture-induced air leakage channels that heighten risks of coal spontaneous combustion and gas explosions. These challenges necessitate enhanced flexibility a...

Study on the slurry characteristics and combustion mechanism of modified coal gasification fine slag-coal water slurry

In this study, carbon-rich gasification fine slag (RCGFS) was modified using emulsified asphalt (EA) to produce modified RCGFS (MRCGFS), which was used to prepare carbon-rich gasification fine slag-coal water slurry (MRCGFS-CWS). Concurrently, the slurry formation properties and...

Physics-Informed Neural Networks for One-Dimensional Groundwater Contaminant Transport: A Synthetic Numerical Study of Prediction and Parameter Inversion

This study developed a physics-informed neural network (PINN) surrogate model for a one-dimensional synthetic groundwater contaminant-transport problem with adsorption, using Crank–Nicolson numerical solutions as the reference data. The effects of observation density and noise on...

In Situ Gas Content Prediction of Deep Coal Seams Based on Logging in the Central Linxing–Shenfu Block

Abstract Deep coalbed methane, a key strategic resource for unconventional natural gas supply, is abundant in the Ordos Basin, China. However, limited systematic research on the state of gas occurrence and critical depth, combined with sparse gas content and in situ stress measur...

Effect of CO2–Water–Coal Coupling on the Mechanical Stability of Deep Coal Seams

Abstract CO2 geological storage in deep coal seams provides dual benefits of carbon storage and enhanced coalbed methane recovery. However, the CO2–water–coal interactions during storage significantly deteriorate the coal’s mechanical properties through swelling and softening mec...

Combined Protection Technology in Deep High In Situ Stress Environment of Metal Mines

Deep mining operations in metal mines face escalating challenges from high in situ stress environments, where conventional single-method ground control approaches often prove insufficient. This study proposes an innovative combined protection technology integrating four synergist...

Interfacial Thermal Transport and Phonon Scattering of Graphene and Graphene Oxide Embedded in Calcium Silicate Hydrate: A Molecular Dynamics Study

Graphene and graphene oxide (GO) are promising nanofillers for improving thermal transport in cementitious materials, but their performance is strongly affected by interactions with calcium silicate hydrate (C-S-H). Understanding how these fillers retain or lose their heat-transp...

Measurement error law and uncertainty characterization method of directional drilling trajectory in advanced investigation

To improve the trajectory control accuracy of directional drilling for advanced geological investigation, this study systematically investigates the composition, propagation law, and uncertainty characterization method of measurement errors based on theoretical calculations and e...

Shaking Table Test on Liquefaction of Sandy Soil Site and Sensitivity Analysis of Liquefaction Influencing Factors

Earthquake-induced soil liquefaction poses a severe threat to the structural safety of underground infrastructure. This paper presents a shaking table model test conducted on sand sites, where two site models—namely, uniform saturated sand and layered dry–saturated sand—are desig...

Numerical Investigation of Mixed Mode I-III Fracture Behavior in Sandstone Under Static and Dynamic Loading

Mixed mode I–III fracture commonly occurs in rock masses under complex three-dimensional stress states, yet the combined effects of loading conditions and fracture mode remain unclear. In this study, a heterogeneous sandstone disc model is developed in ABAQUS by coupling the Druc...