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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Geomechanical risk and mechanism analysis of CO2 sequestration in unconventional coal seams and shale gas reservoirs
October 2023
With global greenhouse gas emissions hitting record highs in 2021, CO2 geological sequestration (CGS) is the most realistic and feasible technology to ensure large-scale carbon reduction to achieve...
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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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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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Hyper-gravity experiment of solute transport in fractured rock and evaluation method for long-term barrier performance
July 2023
Hyper-gravity experiment enable the acceleration of the long-term transport of contaminants through fractured geological barriers. However, the hyper-gravity effect of the solute transport in fractures...
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Progress on rock mechanics research of Beishan granite for geological disposal of high-level radioactive waste in China
July 2023
The mechanical behavior of host rock for a deep geological repository of high-level radioactive waste plays a key role in ensuring the isolation function of host rock as a natural barrier under the...
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First-arrival traveltime tomography for monitoring the excavation damaged zone in the Horonobe Underground Research Laboratory
July 2023
Subsurface excavation results in the formation of a zone called excavation damaged zone (EDZ) around the tunnel wall. An EDZ is a major concern in the field of high-level radioactive waste disposal...
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Disposal of high-level radioactive waste in crystalline rock: On coupled processes and site development
July 2023
Safe disposal of high-level radioactive nuclear waste (HLW) is crucial for human health and the environment, as well as for sustainable development. Deep geological disposal in sparsely fractured crystalline...
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Current status of the geological disposal programme and an overview of the safety case at the pre-siting stage in Japan
July 2023
In Japan, high-level radioactive waste and specific low-level radioactive waste which includes long-lived radionuclides are planned to be disposed of in the geological formations at depths greater than...
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Numerical simulations for describing generation of excavation damaged zone: Important case study at Horonobe underground research laboratory
July 2023
The aim of the present research was to establish a case study for the prediction of the unknown EDZ (Excavation Damaged Zone) distribution using a numerical analysis calibrated by replicating the trends...
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Basic analysis of rock mechanical and thermal properties in South Korea
July 2023
This study analyzed the mechanical and thermal properties of various rock types found in South Korea. The results showed that both igneous and metamorphic rocks possess higher strength compared to sedimentary...
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Rainfall early warning threshold and its spatial distribution of rainfall-induced landslides in China
July 2023
In order to investigate the spatial distribution of early warning threshold for landslide induced by rainfall in China, the literatures about rainfall thresholds of landslides in China in recent 20...
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KAERI underground research laboratory: Overview of in-situ experiments
July 2023
Social concerns regarding the safety of high-level radioactive waste have increased with growing public awareness of environmental issues and nuclear power. The performance assessment of deep geological...
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Analytical solutions for consolidation of stone column composite foundations considering time-dependent boundary and loading
July 2023
In response to the existing consolidation theory for stone column composite foundations which cannot consider the time-dependent loading and the well resistance effect of stone columns under time-dependent...
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Permeability evolution during pressure-controlled shear slip in saw-cut and natural granite fractures
April 2023
Fluid injection into rock masses is involved during various subsurface engineering applications. However, elevated fluid pressure, induced by injection, can trigger shear slip(s) of pre-existing natural...
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Study on instability fracture and simulation of surrounding rock induced by fault activation under mining influence
April 2023
The fault is potentially vulnerability's geological structure in the working face and its vicinity, and it is also a crucial geological factor affecting coal mine safety exploitation. To investigate...
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Rapid intelligent evaluation method and technology for determining engineering rock mass quality
April 2023
The evaluation of engineering rock mass quality is fundamental work for the engineering activities of rock mass. The increasing scale of rock mass engineering necessitates higher intelligence, timeliness,...
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Constitutive modeling of a laumontite-rich tight rock and the application to poromechanical analysis of deeply drilled wells
April 2023
Geological formations containing laumontite-rich rock are usually treated as problematic for geo-energy production projects because the presence of laumontite mineral can promote complex mechanical...
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Uniquely determine fracture dimension and formation permeability from diagnostic fracture injection test
April 2023
Estimating formation permeability is crucial for production estimation, hydraulic fracturing design optimization and rate transient analysis. Laboratory experiments can be used to measure the permeability...
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Comparative study on heat extraction performance of three enhanced geothermal systems
April 2023
Enhanced geothermal systems (EGSs) in this study are classified as fracturing-EGS (F-EGS), pipe-EGS (P-EGS) and excavation-EGS (E-EGS) according to reservoir stimulation strategies. However, the heat...
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Evaluation method of underground water storage space and thermal reservoir model in abandoned mine
April 2023
A large number of mines are closed or abandoned every year in China. Geothermal utilization is one of the important ways to efficiently reuse underground resources in abandoned mines. How to calculate...
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Effect of temperature-dependent rock thermal conductivity and specific heat capacity on heat recovery in an enhanced geothermal system
April 2023
The modeling of heat recovery from an enhanced geothermal system (EGS) requires rock thermal parameters as inputs such as thermal conductivity and specific heat capacity. These parameters may encounter...
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A temperature gradient test system for investigating thermo-mechanical responses of containment materials of underground storage facilities
April 2023
Underground energy storage is a promising option for the global ambition of moving towards carbon neutrality. To achieve safe and reliable energy storage in underground caverns, it is essential to understand...
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Determination of the crustal friction and state of stress in deep boreholes using hydrologic indicators
January 2023
We apply binary logistic regression to correlate fracture shear-slip criticality to hydraulic conductivity using data from four deep scientific boreholes in fractured crystalline rocks. In each borehole,...
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