PowerChina (China)

A Fully Connected Neural Network Enhanced Peridynamic Framework for Efficient Simulation of Hydraulic Fracturing in Fractured Rocks

ABSTRACT Hydraulic fracturing involves strong coupling among fluid flow, rock deformation and fracture evolution. Peridynamics can naturally represent crack initiation and propagation without explicit crack tracking, but repeated nonlocal seepage calculations make hydro‐mechanica...

Recent advances in the synthesis methods, modification strategies, and performance optimization of metal-organic frameworks for hydrogen storage

The ultimate practical goal is to achieve high-capacity hydrogen storage at room temperature. Metal-organic frameworks (MOFs) demonstrate significant potential for solid-state hydrogen storage, yet their room-temperature hydrogen storage remains far below practical targets due to...

AN Improved Smoothed Particle Hydrodynamics Method Applied to Crack Propagation and Deformation of Circular Deep Tunnels in Layered Rock

ABSTRACT To investigate the processes of crack propagation and deformation failure of surrounding rock induced by deep tunnel excavation in layered rock masses, the conventional smoothed particle hydrodynamics (SPH) method is improved. A novel numerical simulation approach, terme...

Quantitative operating risk assessment of Francis turbine unit under variable load in hydro-wind-solar complementary energy system

The hydro-wind-solar multi-energy complementary clean energy base (HWS-MECB) is an effective approach for renewable energy integration, in which hydro turbine unit (HTU) play a critical stabilizing role. However, participation in such systems forces HTUs to operate frequently in...

An improved CNN-BiLSTM video-based rainfall intensity estimation method based on attention mechanisms and residual connection variants

ABSTRACT Accurate monitoring of rainfall intensity is essential for forecasting and managing floods. The surveillance video-based rainfall measurement method has potential for high spatial and temporal resolution rainfall monitoring. Existing video-based rainfall estimation model...

Influences of tunnel radius on minimum overburden thickness for underwater shield tunnels crossing structural planes

To ensure the stability and cost-effectiveness of underwater shield tunnels, reasonable design of the minimum overburden thickness is required. Nevertheless, how to rationally determine this thickness remains unclear when the coupled effects of rock structural planes and tunnel r...

Experimental investigation and strength evaluation of steel-plate composite wall-to-wall L- and T-joints with different novel shear reinforcement

The steel-plate composite wall-to-wall joint configuration specified in current design codes is particularly susceptible to shear failure. Existing experimental studies have reached contradictory conclusions regarding whether shear reinforcement can enhance joint strength. The in...

A tolerance-based framework for optimizing profile sampling intervals in joint infilling assessment and shear strength prediction

The accurate assessment of joint infilling is critical for reliably estimating the shear strength of rock masses. While common practice often follows the International Society for Rock Mechanics (ISRM) suggestion of using a sampling interval ( ∆L ) equal to 2% of the total sample...

Experimental study on gas fracturing behavior of damaged basalt in compressed air energy storage caverns

Compressed air energy storage (CAES) caverns excavated in hard rock experience repeated mechanical disturbance during construction and cyclic gas pressurization during operation, which may progressively degrade surrounding rock and influence fracture stability. To investigate gas...

Study on the oil-water two-phase flow characteristics of tight reservoir based on digital core technology

Abstract Tight reservoirs are characterized by low porosity, low permeability and complex pore structures, resulting in poor waterflood recovery efficiency. Existing microscale two-phase flow studies are mostly based on two-dimensional geometric models, and the physical mechanism...

Characterizing Long-Term Urban Impervious Surface Dynamics and Landscape Pattern Evolution Through an Integrated Area–Density Perspective

Impervious surface expansion is a defining manifestation of urbanization, but changes in total area alone cannot reveal how transitions in development density reshape landscape structure. Adopting an integrated area–density perspective, this study examined impervious surface expa...

Early-age microstructural characteristics and improvement mechanisms of cement–fly ash stabilized dispersive soil

Dispersive soil is highly susceptible to erosion and seepage failure, posing significant risks to hydraulic and geotechnical structures. This study evaluates the effectiveness of a fly ash–dominated cementitious stabilization system for improving dispersive soil. A series of disp...

Characteristics of Flue Gas Dechlorination by Ethanol-Digested Calcium Oxide and Its Effect on Mercury Speciation and Concentration

This study aims to investigate the feasibility of ethanol-digested calcium oxide (CaO-E) as a novel dechlorination sorbent for the efficient removal of hydrogen chloride (HCl) from coal-fired flue gas and further evaluate its influence on mercury speciation and transformation in...

Dynamic Response Analysis of IEA 15 MW FOWT Under Extreme Focused Wave–Wind Conditions Based on Multi-Region Coupled Method

This study employs a multi-region coupled method to investigate the motion responses and aerodynamic load variations of the IEA 15 MW semi-submersible floating wind turbine (FOWT) under extreme focused wave conditions. The methodology employs the self-developed MRFoam solver with...

Zonal Variations in Cavern Inflow Features and Water Management of Pumped Hydro Storage in China

Pumped hydro storage is a well-established and reliable form of energy storage, with construction scale expanding steadily in recent years. Underground cavern excavation is an indispensable part of pumped storage construction, while sustained cavern inflow poses potential threats...

Preparation Method of Simulated Deep Sandstone Materials Based on Dual Equivalence of Principal Components and Mechanical Properties, and Quantitative Evaluation of Simulation Effectiveness

Intact deep sandstone cores are scarce, heterogeneous with poorly repeatable, limiting systematic laboratory studies of deep-rock mechanical behavior. This study selected dense sandstone recovered from 1050 m in the Pingdingshan mining area as the prototype system for the develop...

Study on Threshold Values of Safety Control Indicators for Rapid Drawdown of 200~300 m High Earth-Rockfill Dams

High dams and large reservoirs serve flood control, power generation, water supply and ecological security, where rapid safe drawdown is vital for emergency handling and long-term safe operation. Targeting undefined rapid drawdown control standards for over-200 m ultra-high earth...