Introducing a new rock abrasivity index using a scaled down disc cutter
July 2024
Rock abrasivity influences wear of cutting tools and consequently, performance of mechanized tunneling machines. Several methods have been proposed to evaluate rock abrasivity in recent decades, each...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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Prediction of uniaxial compressive strength of rock based on lithology using stacking models
October 2023
Uniaxial compressive strength (UCS) of rock is an essential parameter in geotechnical engineering. Point load strength (PLS), P-wave velocity, and Schmidt hammer rebound number (SH) are more easily...
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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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Simulation of 3D fracture propagation under I-II-III mixed-mode loading
October 2023
Fracture propagation under mixed-mode loading conditions prevails in many natural geological processes and deep engineering projects, while the corresponding numerical simulation is very challenging...
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Measurements of elastic properties and their dependencies within a damage mechanics workflow
October 2023
Experimental rock mechanics testing provides a controlled and effective method for measuring physical properties, their dependencies, and their evolution due to the addition of localized microcracks....
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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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