4.7 Article

Characterization of shear behavior and damage mechanism of periodic thermal loading sandstone based on NMR technique

Related references

Note: Only part of the references are listed.
Article Engineering, Geological

Analysis of the Microscopic Evolution of Rock Damage Based on Real-Time Nuclear Magnetic Resonance

Jing Bi et al.

Summary: In this study, real-time T2-weighted nuclear magnetic resonance (NMR) spectra and imaging were used to characterize the size and distribution of pores in different types of sandstone samples during low-confining-stress triaxial compression tests. It was found that the area of macropores in sandstone increased only during the initial loading stage but played an opposite role in the damage evolution process. The number of pores and mesopores increased during the linear deformation stage, while the number of macropores decreased. A damage model based on the NMR results is proposed.

ROCK MECHANICS AND ROCK ENGINEERING (2023)

Article Engineering, Geological

Mutual impact of true triaxial stress, borehole orientation and bedding inclination on laboratory hydraulic fracturing of Lushan shale

Yongfa Zhang et al.

Journal of Rock Mechanics and Geotechnical Engineering (2023)

Article Energy & Fuels

Impacts of wellbore orientation with respect to bedding inclination and injection rate on laboratory hydraulic fracturing characteristics of Lushan shale

Yongfa Zhang et al.

Summary: A series of hydraulic fracturing experiments were conducted to investigate the formation mechanism of fracture networks in Lushan shale cores under different conditions. The experiments showed that adjusting the maximum principal stress perpendicular to the wellbore and inclined bedding can help reduce the breakdown pressure and create a complex fracture network. However, this may also increase the fracture surface roughness, which could impede the transportation of proppant.
Article Geochemistry & Geophysics

Effect of attenuation on amplitude distribution and b value in rock acoustic emission tests

Daolong Chen et al.

Summary: The study investigates the effect of attenuation on the estimate of b value and finds that data truncation is the primary cause of modification of the frequency-amplitude distribution in the presence of attenuation. The research also determines the minimum data volume required for accurate estimation of the underlying b value from the apparent amplitude distribution.

GEOPHYSICAL JOURNAL INTERNATIONAL (2022)

Article Materials Science, Multidisciplinary

Experimental investigation on the effect of open fire on the tensile properties and damage evolution behavior of granite

Tubing Yin et al.

Summary: This study investigates the effects of open fire and different cooling methods on granites. The results show that the fire duration and cooling treatment significantly affect the mechanical properties of granite. The P-wave velocity, static nominal tensile strength, and dynamic nominal tensile strength of granite decrease rapidly during the initial 10 minutes and slowly decrease thereafter. Water-cooling treatment causes greater damage to heated granite compared to air-cooling treatment.

INTERNATIONAL JOURNAL OF DAMAGE MECHANICS (2022)

Article Engineering, Geological

Experimental investigation of the effect of thermal treatment on shear characteristics of healed rock joints

Tianqi Zhai et al.

Summary: Understanding the temperature-dependent shear behavior of rock joints is crucial for deep rock engineering. The shear characteristics of healed rock joints under high temperatures show slightly lower resistance than intact rock but significantly more than clean joints. Thermal treatment greatly influences the peak shear strength, shear stiffness, and dilation angle of healed joints, while the ultimate shear strength remains almost independent of temperature.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2022)

Article Engineering, Mechanical

Experimental investigation of mixed mode I-II fracture property of thermally treated granite under dynamic loading

Haijian Su et al.

Summary: In this paper, dynamic impact loading tests were conducted on heat-treated CSTBD granite specimens using the SHPB system. The effects of temperature and loading mode on fracture toughness, fracture growth path, strain distribution, and fracture angle were analyzed.

THEORETICAL AND APPLIED FRACTURE MECHANICS (2022)

Article Engineering, Mechanical

Experimental studies on the effect of cyclic thermal shock and cooling methods on the mechanical properties and fracture behavior of prefabricated fissured sandstone

Man Li et al.

Summary: The effect of thermal shocks and cooling methods on the mechanical properties and fracture behavior of sandstone containing a single pre-fabricated fissure was investigated in this study. The results show that the number of thermal shocks and the cooling method significantly affect the damage to the fissured sandstone, and an empirical formula considering these factors was proposed.

THEORETICAL AND APPLIED FRACTURE MECHANICS (2022)

Article Mechanics

Characterization of anisotropic mode II fracture behaviors of a typical layered rock combining AE and DIC techniques

Z. D. Fan et al.

Summary: The anisotropy of mode II fracture in layered rocks varies significantly with different bedding angles, and the crack propagation resistance cannot be fully characterized by fracture toughness. Acoustic emission monitoring reveals noticeable anisotropies in the threshold values of mode II stress intensity factor and the b value results indicate different fracture characteristics under different conditions.

ENGINEERING FRACTURE MECHANICS (2022)

Article Geochemistry & Geophysics

Crack Coalescence Behavior of Rock-Like Specimens Containing Two Circular Embedded Flaws

Jing Bi et al.

Summary: This paper proposes a method for creating internal flaws in specimens using the volatilization of camphor and investigates the internal damage behavior of flawed specimens through compression tests and CT techniques. The experimental results show that the strength and deformation properties of flawed specimens increase nonlinearly with the confining pressure and flaw inclination angle. The crack coalescence patterns and failure modes of flawed specimens depend on both the confining pressure and the flaw inclination angle.

LITHOSPHERE (2022)

Article Engineering, Geological

Experimental Investigation of Thermal Strengthening in Sichuan Marble

Louis Ngai Yuen Wong et al.

Summary: By conducting triaxial compression tests on Sichuan marble under 25-200 degrees Celsius, a clear trend of strength increase with temperature was observed, justifying the existence of thermal strengthening. The main reason leading to this phenomenon was inferred to be thermal expansion, resulting in tighter compaction between mineral grains. This study sheds light on the thermal effect on rock strength, providing valuable insights for rock engineering design.

ROCK MECHANICS AND ROCK ENGINEERING (2022)

Article Engineering, Geological

Permeability evolution of coal subjected to triaxial compression based on in-situ nuclear magnetic resonance

Chaolin Wang et al.

Summary: This study investigated the influence of stress on the evolution of coalbed methane permeability through compaction-permeability tests and in-situ nuclear magnetic resonance measurements. The results showed that permeability is closely related to coal pores, with an increase in damage leading to nonlinear permeability growth.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2022)

Article Geosciences, Multidisciplinary

A Stratified NMR-Based Investigation of Spatial Evolution of Pore Structure in Sandstone After Cyclic Heating and Local Water Cooling

Can Du et al.

Summary: This investigation examines the effects of local water-cooling shock on the physical properties and spatial evolution of pore structure in thermal sandstone. The results show that water cooling leads to degeneration of porous structure, changes in physical properties, and increased permeability. The damage evolution varies across different parts of the sample, with greater increases in micro-, meso-, and macro-pores observed in the immersed part compared to the air-exposed part. The study also finds that the total porosity and damage factor increase with temperature, water cooling depth, and cycles, and that permeability is more dependent on porosity than pore size distribution.

NATURAL RESOURCES RESEARCH (2022)

Article Engineering, Environmental

Influence of multiple porous structure evolution on physical-mechanical properties and damage mechanism of sandstone heated continuously/periodically with the identical heating time

Yu Zhao et al.

Summary: This paper studied the physical-mechanical properties and damage mechanism of sandstone after continuous/periodic heating. The results showed that periodic heating can enhance the mechanical properties of sandstone, but the effect is temperature-dependent. The evolution of the porous structure plays an important role in the mechanical properties of sandstone.

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2022)

Article Engineering, Geological

Inconsistency of changes in uniaxial compressive strength and P-wave velocity of sandstone after temperature treatments

Jinyuan Zhang et al.

Summary: The changes in UCS and P-wave velocity of sandstone with temperature rise show various trends, mainly influenced by factors such as microstructure variation, quartz content, transformation plasticity of clay minerals, etc.

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING (2021)

Article Engineering, Geological

Evolution of permeability and microscopic pore structure of sandstone and its weakening mechanism under coupled thermo-hydro-mechanical environment subjected to real-time high temperature

Tao Meng et al.

Summary: This study observed the permeability evolution in sandstone under real-time high temperature and triaxial stress using a self-developed universal tester with high temperature and high pressure capabilities. The results show that the microscopic structures within the sandstone under the coupled thermo-hydro-mechanical condition are vastly different from those subjected to heat treatment only.

ENGINEERING GEOLOGY (2021)

Article Engineering, Geological

Experimental study on the failure process of sandstone subjected to cyclic loading and unloading after high temperature treatment

Weijing Xiao et al.

Summary: The experimental results show that the stress-strain curve, Young's modulus, and crack volume strain of sandstone samples exhibit unique characteristics during cyclic loading and unloading after high-temperature treatment. The dissipation energy of sandstone samples increases significantly after high-temperature treatment compared to samples treated at lower temperatures.

ENGINEERING GEOLOGY (2021)

Article Energy & Fuels

Factors affecting pore structure of granite under cyclic heating and cooling: A nuclear magnetic resonance investigation

Qiang Li et al.

Summary: Research findings suggest that cyclic heating and cooling can increase porosity and decrease ultrasonic velocity in granite; as heating temperature, cooling rate, and thermal cycles increase, porosity and movable porosity of samples increase, while pore complexity decreases; granite with lower heating temperature or finer particles can maintain stable pore structure for more thermal cycles.

GEOTHERMICS (2021)

Article Engineering, Geological

Experimental Investigation on Physical and Mechanical Properties of Granite Subjected to Cyclic Heating and Liquid Nitrogen Cooling

Guan Rong et al.

Summary: Cyclic liquid nitrogen fracturing can potentially enhance geothermal energy exploitation. This study demonstrated that increasing the number of cycles in heating-cooling experiments worsens the internal structural damage of granite, with the damage being most prominent in the initial cycles.

ROCK MECHANICS AND ROCK ENGINEERING (2021)

Article Energy & Fuels

Shear mechanical responses of sandstone exposed to high temperature under constant normal stiffness boundary conditions

Qian Yin et al.

Summary: Characterizing the temperature-dependent shear mechanical responses of rock masses under constant normal stiffness boundary conditions is essential for deep underground projects. This study experimentally analyzed the shear properties and dilatancy deformation of sandstone at high temperatures, finding that defects increase porosity and decrease properties like P-wave velocity and fractal dimension. The study identified a shear failure process, with variations in shear strength, normal stress, and displacement with temperature and normal stress levels.

GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES (2021)

Article

Changes in b-values due to sandstone failure after exposure to high temperatures

Zhenlong Ge et al.

Arabian Journal of Geosciences (2021)

Article Engineering, Environmental

Experimental investigation of triaxial compression and permeability of gritstone in geothermal environment

Yu Zhao et al.

Summary: This study experimentally investigated the microscopic failure characteristics and macroscopic mechanics of gritstone under geothermal conditions through hydrothermal and cooling treatments. The results showed that the pre-treating pressure influenced the triaxial compressive strength of gritstone, and high-pressure water treatment significantly affected the permeability of the specimens. The analysis revealed that temperature and pressure in the geothermal environment affected cracking and dissolution in gritstone, affecting crack initiation and propagation.

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2021)

Article Energy & Fuels

Macroscopic and microscopic experimental research on granite properties after high-temperature and water-cooling cycles

Bo Zhang et al.

Summary: Experimental investigation on high-temperature and water-cooling cycles reveals that the mechanical properties and microscopic characteristics of granite undergo changes. The uniaxial compressive strength, elasticity modulus, and P-wave velocity decrease with increasing temperature and cycles, with mineral expansion and cyclic thermal shock being the main reasons for rock deterioration. Additionally, there is a good correlation between P-wave velocity and mechanical parameters, indicating that the ultrasonic method can reflect changes in mechanical characteristics.

GEOTHERMICS (2021)

Article Geochemistry & Geophysics

Identifying critical failure information of thermal damaged sandstone through acoustic emission signal

Weiqiang Zhang et al.

Summary: This study examines the changes in acoustic emission signals of sandstone after treatment at different high temperatures, identifying a critical point on the energy curve to indicate failure at 900 degrees C. Increasing temperatures increase rock plasticity and decrease brittleness, with a more obvious transition from brittleness to plasticity at temperatures above 600 degrees C. Large-scale micro cracking at this temperature range weakens and reduces the brittleness of sandstone, while increasing its plasticity.

JOURNAL OF GEOPHYSICS AND ENGINEERING (2021)

Article Engineering, Geological

Influence of Temperature on the Structure of Pore-Fracture of Sandstone

Peihua Jin et al.

ROCK MECHANICS AND ROCK ENGINEERING (2020)

Article Engineering, Environmental

Effects of rapid cooling treatment on heated sandstone: a comparison between water and liquid nitrogen cooling

Qiang Li et al.

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2020)

Article Engineering, Geological

Temperature-dependent peak shear-strength criterion for granite fractures

Zhi Cheng Tang et al.

ENGINEERING GEOLOGY (2020)

Article Engineering, Geological

Experimental Investigation on Temperature-dependent Shear Behaviors of Granite Discontinuity

Zhi Cheng Tang

ROCK MECHANICS AND ROCK ENGINEERING (2020)

Article Construction & Building Technology

Effects of the cooling treatment on the dynamic behavior of ordinary concrete exposed to high temperatures

Jing Bi et al.

CONSTRUCTION AND BUILDING MATERIALS (2020)

Article Engineering, Geological

Physico-mechanical properties of granite after cyclic thermal shock

Peiyang Yu et al.

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING (2020)

Article Engineering, Geological

Shear Behavior of Artificial and Natural Granite Fractures After Heating and Water-Cooling Treatment

Yuedu Chen et al.

ROCK MECHANICS AND ROCK ENGINEERING (2020)

Article Geochemistry & Geophysics

A New b Value Estimation Method in Rock Acoustic Emission Testing

Xiling Liu et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2020)

Article Materials Science, Multidisciplinary

Viscoelastic-plastic damage creep model for salt rock based on fractional derivative theory

Fei Wu et al.

MECHANICS OF MATERIALS (2020)

Article Mechanics

Shear behavior of Beishan granite fractures after thermal treatment

Zhihong Zhao et al.

ENGINEERING FRACTURE MECHANICS (2019)

Editorial Material Multidisciplinary Sciences

Managing injection-induced seismic risks

Kang-Kun Lee et al.

SCIENCE (2019)

Article Engineering, Geological

Variations of Physical and Mechanical Properties of Heated Granite After Rapid Cooling with Liquid Nitrogen

Xiaoguang Wu et al.

ROCK MECHANICS AND ROCK ENGINEERING (2019)

Article Engineering, Environmental

Micro/macro physical and mechanical variation of red sandstone subjected to cyclic heating and cooling: an experimental study

Quansheng Liu et al.

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT (2019)

Article Engineering, Multidisciplinary

A zero-thickness cohesive element-based numerical manifold method for rock mechanical behavior with micro-Voronoi grains

Zhijun Wu et al.

ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS (2018)

Article Engineering, Geological

Effect of Varied Durations of Thermal Treatment on the Tensile Strength of Red Sandstone

N. N. Sirdesai et al.

ROCK MECHANICS AND ROCK ENGINEERING (2017)

Article Engineering, Geological

Thermal alterations in the poro-mechanical characteristic of an Indian sandstone - A comparative study

Nikhil Ninad Sirdesai et al.

ENGINEERING GEOLOGY (2017)

Article Engineering, Geological

Thermal stress-induced microcracking in building granite

D. M. Freire-Lista et al.

ENGINEERING GEOLOGY (2016)

Article Engineering, Geological

Experimental study on the prediction of rockburst hazards induced by dynamic structural plane shearing in deeply buried hard rock tunnels

Fanzhen Meng et al.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2016)

Review Green & Sustainable Science & Technology

Enhanced geothermal systems (EGS): A review

P. Olasolo et al.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2016)

Article Engineering, Geological

Effects of Thermal Treatment on the Dynamic Mechanical Properties of Coal Measures Sandstone

Ming Li et al.

ROCK MECHANICS AND ROCK ENGINEERING (2016)

Article Engineering, Civil

Thermo-hydric analysis of concrete-rock bilayers under fire conditions

Anna Paula G. Ferreira et al.

ENGINEERING STRUCTURES (2014)

Article Engineering, Geological

Effect of cooling rate on the mechanical behavior of heated Strathbogie granite with different grain sizes

Shishi Shao et al.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2014)

Article Engineering, Geological

Brittleness Effect on Rock Fatigue Damage Evolution

Hamid Reza Nejati et al.

ROCK MECHANICS AND ROCK ENGINEERING (2014)

Article Engineering, Geological

Effect of Rapid Thermal Cooling on Mechanical Rock Properties

Kwangmin Kim et al.

ROCK MECHANICS AND ROCK ENGINEERING (2014)

Article Geosciences, Multidisciplinary

Acoustic emissions document stress changes over many seismic cycles in stick-slip experiments

T. H. W. Goebel et al.

GEOPHYSICAL RESEARCH LETTERS (2013)

Article Engineering, Geological

Study on dynamic characteristics of marble under impact loading and high temperature

Shi Liu et al.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2013)

Article Engineering, Geological

Experimental study on the influence of temperature on the mechanical properties of granite under uni-axial compression and fatigue loading

You-Liang Chen et al.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2012)

Article Engineering, Geological

Thermal effect on the physical properties of carbonate rocks

H. Yavuz et al.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2010)

Article Environmental Sciences

Mineralogical and colour changes of quartz sandstones by heat

M Hajpál et al.

ENVIRONMENTAL GEOLOGY (2004)

Article Materials Science, Multidisciplinary

Analysis and prediction of thermal shock in brittle materials

M Collin et al.

ACTA MATERIALIA (2000)