Experimental investigation on acoustic emission precursor of rockburst based on unsupervised machine learning method
April 2024
The key to achieving rockburst warning lies in the understanding of rockburst precursors. Considering the correlation characteristics of rockburst acoustic emission (AE) parameters, a self-organizing...
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Compaction and seepage characteristics of broken coal and rock masses in coal mining: A review in laboratory tests
April 2024
Broken coal and rock (BCR) are an important component medium of the caving zone in the goaf (or gob), as well as the main filling material of fault fracture zone and collapse column. The compaction...
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Experimental investigation of stress unloading effects on rock damage and confining pressure-dependent crack initiation stress of porous sandstone under true triaxial stress environments
April 2024
This study investigates the impact of intermediate (σ2) and minimum (σ3) principal stress unloading on damage behavior and the confining pressure influence on crack initiation stress (σci) in true triaxial...
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Assessment and optimization of fracture-karst cave connectivity in horizontal well hydraulic fracturing of carbonate reservoirs
April 2024
The karst cave serves as the primary storage space in carbonate reservoirs. Simultaneously connecting multiple karst caves through hydraulic fracturing is key to the efficient development of carbonate...
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Geothermal extraction performance in fractured granite from Gonghe Basin, Qinghai province, China: Long-term injection and production experiment
April 2024
The efficient exploitation of geothermal energy through enhanced geothermal systems (EGS) has been a relevant topic for hot dry rock (HDR) geothermal resources. When cryogenic fluid is injected into...
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Modelling the brittle rock failure by the quaternion-based bonded-particle model in DEM
April 2024
This paper presents an investigation of brittle rock failure by the quaternion-based bonded-particle model in discrete element method (DEM). Unlike traditional approaches that utilize Euler angles or...
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A review on experimental techniques and their applications in the effects of mineral content on geomechanical properties of reservoir shale rock
April 2024
Understanding the effects of mineral composition on geomechanical characteristics is critical in order to design and optimize the hydraulic fracturing necessary for shale gas reservoir production. Fundamental...
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A comprehensive analysis of formation conditions, intrinsic properties, and mechanical responses of gas hydrate-bearing sediments
April 2024
Natural gas hydrates (NGH) stored in submarine deposits are a promising energy resource, Yet, the deterioration in sediment strength can trigger geological disasters due to drilling-induced hydrate...
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Analytical prediction for time-dependent interaction of a circular tunnel excavated in strain-softening rock mass
Available online 17 April 2024
Viscoelastic plastic solutions for tunnel excavation in strain-softening rock mass and tunnel-rock interaction are proposed based on the Mohr-Coulomb and the Generalized Zhang-Zhu (GZZ) strength criterion...
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Two-phase flow Thermo-Hydro-Mechanical (THM) modelling for a water flooding field case
Available online 16 April 2024
Simulation of subsurface energy system involves multi-physical processes such as thermal, hydraulical, and mechanical (THM) processes, and requires a so-called THM coupled modeling approach. THM coupled...
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Experimental and calculation modeling of supercritical CO2 phase change pulse pressure characteristics
Available online 10 April 2024
Utilizing a bespoke CO2 phase transition pulse pressure experimental system, we conducted pulse pressure characterization tests across various activator masses, CO2 filling pressures, and energy discharge...
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Simultaneously improving ROP and maintaining wellbore stability in shale gas well: A case study of Luzhou shale gas reservoirs
Available online 30 March 2024
The ROP (rate of penetration) within the horizontal section of shale gas wells in the Luzhou oil field is low, seriously delaying the exploration and development process. It is proved that reducing...
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Optics-based metaheuristic approach to assess critical failure surfaces in both circular and non-circular failure modes for slope stability analysis
January 2024
In many construction projects, a proactive slope stability evaluation is a prerequisite. Although many deterministic or non-deterministic approaches have been commonly used, metaheuristic approaches...
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Damage effect and progressive failure mechanism of sandstone considering different flaw angles under dynamic loading
January 2024
In many engineering applications, it is essential to have information about rocks that inherently contain pre-existing flaws under dynamic loading conditions. Dynamic impact tests are conducted on samples...
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Sidewall rockburst of highly stressed D-shape hole tunnel triggered by impact load: An experimental investigation
January 2024
This study aims to clarity the failure mechanism of sidewall rockburst of highly stressed D-shape tunnel triggered by impact load. Using the biaxial Hopkinson pressure bar (BHPB) system, we have developed...
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Finite domain solution of a KGD hydraulic fracture in the viscosity-dominated regime
January 2024
This paper describes a numerical algorithm for solving the classic problem of a plane strain (KGD) fracture propagating in an impermeable elastic medium with zero toughness. The method, which takes...
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Effective yield strength of a saturated porous medium with a spheroidal meso-pore and spherical micro-pores
January 2024
A macroscopic yield criterion has been derived in the present work for a double saturated porous medium with a spheroidal pore at the mesocale and spherical pores at the microscale. These two types...
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Intelligent early-warning platform for open-pit mining: Current status and prospects
January 2024
As the profundity of open-pit mining operations has increased, so has the frequency of geological disasters. The complex interaction of factors causing these disasters presents technical challenges...
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Assessment of nano-to-micro-scale geomechanical properties and their time-dependent behavior: Current status and progressive perspectives
January 2024
Rocks can deform at varying scales (nano-, micro- and macro-scale) under different temperatures, pressures, stresses, and time conditions. Sub-core scale (nano-to micro-scale) changes in rock properties...
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Characteristic stress and strain precursor information for fine-grained granite during failure process under triaxial loading and unloading conditions
January 2024
The unloading effect by excavation may cause irreversible and severe damage to the surrounding rock masses in underground engineering. In this paper, both conventional triaxial compression (CTC) tests...
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Horizontal borehole azimuth optimization for enhanced stability and coal seam gas production
January 2024
Horizontal boreholes have been widely used to extract natural gas from coal seams. However, these boreholes can encounter severe instability issues leading to production interruption. Optimizing drilling...
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Evaluation method of rock damage under uniaxial compression based on unit series-parallel electrical conductive model
October 2023
The evaluation of rock damage behaviour is an important requirement for ensuring stability control and safety prediction in rock engineering. However, they have not been able to obtain sufficiently...
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Investigation on the physical mechanism of cavity percentage dependent shear strength for rock joints considering the real contact joint surface
October 2023
To explain the effect of joint roughness on joint peak shear strength (JPSS) and investigate the effect of different contact states of joint surface on JPSS, we try to clarify the physical mechanism...
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Assessment of inherent heterogeneity effect on continuous mechanical properties of shale via uniaxial compression and scratch test methods
October 2023
Shale reservoirs have been a significant focus of hydrocarbon production over the past few decades, and the mechanical assessment of target shale reservoirs has been critical to successful field operations,...
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More is different: On the emergence of collective phenomena in fractured rocks
October 2023
Fractures widely exist in crustal rocks and form complex networks dominating the bulk behaviour of geological media. Thus, understanding how fracture networks affect subsurface processes/phenomena is...
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