Investigation of Impact Compressive Mechanical Properties of Sandstone After as well as Under High Temperature

Shi, Lei; Xu, Jinyu

doi:10.1515/htmp-2013-0125

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…In cooling process, part of water freezes and expands about 9% of the original volume, and this expansion induces tensile stress concentration and damages the micropores. In heat process, mineral particles generate uncoordinated deformation caused by the difference in thermal-expansion coefficient [33,34], leading to the thermal force, which will damage the rock structure. Recurrent H-C cycles gradually lead to the accumulation of damage inside rock and further weaken its mechanical properties.…”

Section: Thermal Damage Mechanismmentioning

confidence: 99%

Effect of hydrothermal coupling on energy evolution, damage, and microscopic characteristics of sandstone

Zhang

et al. 2020

High Temperature Materials and Processes

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Heat–cool (H–C) cycle is a serious natural weathering mechanism for rock engineering in temperate desert climate; meanwhile, engineering rocks usually involve responses to impact loads arising from blasting operation, mechanized construction, and seismic oscillation. Considering the universality and destructiveness of rock failure caused by H–C cycle weathering coupled with dynamic loading, split Hopkinson pressure bar tests were conducted for sandstone with various H–C cycles. Additionally, hydrothermal coupled damage (D) was defined based on variation of total import strain energy. Energy evolution, damage, and microscopic characteristics of sandstone after diffierent H–C cycles were studied. Finally, the microcosmic structure changes of sandstone after various H–C cycles are compared by means of scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) technology. Results show that decreasing rate of total import strain energy in high temperature group is significantly larger compared with that in low temperature group and moderate temperature groups. Repeated H–C cycles produce the thermal stress at the mineral boundary constantly and fracture along the boundary of the mineral particle according to the SEM and EDS results.

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Section: Thermal Damage Mechanismmentioning

confidence: 99%

Effect of hydrothermal coupling on energy evolution, damage, and microscopic characteristics of sandstone

Zhang

et al. 2020

High Temperature Materials and Processes

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“…Most of the above studies only carried out uniaxial compression experiments on rock samples, and subsequent scholars have successively carried out various forms of rock mechanics experiments under real-time high temperature [21][22][23][24][25]. Zhao et al [26,27] carried out triaxial compression experiments on granite under 20 MN confining pressure in the range of room temperature to 600 • C using the servo-controlled triaxial compression experimental system under high temperature and high pressure, which found that the thermal cracking of granite was intermittent and multi-stage, while the thermal deformation coefficient had a large difference compared to unconstrained conditions.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength and Energy Evolution of Granite under Real-Time Temperature

Guo

Feng

2023

Sustainability

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The shear mechanical properties of rock under high temperature and high pressure are key issues in geothermal energy development. In order to explore the variation in shear mechanical properties of rock under high temperature and high pressure, the shear experiments of granite under real-time temperatures and normal stresses were carried out using the servo-controlled true triaxial experimental system for rock shearing testing and acoustic emission technology. The results show the following trends: (1) the peak shear strength of granite increases slightly first and then decreases sharply with real-time temperature, with 200 °C considered as the threshold temperature for the peak shear strength of granite. When the temperature is constant, the shear strength of granite increases linearly with the increase in normal stress. (2) Before 200 °C, the shear modulus of granite decreases slowly with the increase in temperature and decreases rapidly after 200 °C. The shear modulus always increases linearly with the increase in normal stress. (3) Under the coupling effect of real-time high temperature and normal stress, the cumulative acoustic emission energy released during the shear deformation of granite gradually decreases with temperature, and the main failure mode of granite gradually changes from tensile failure to shear failure.

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“…Rock engineering safety problem induced by high temperature had become an important topic in rock mechanics research [1][2][3]. High-temperature rock mechanical behavior was different from normal temperature, and its physical and mechanical properties were closely related to the temperature; hence, studying the mechanical behavior of rock after high temperature had important theoretical and engineering significance [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Mechanical Properties and Energy Evolution Characteristics of Limestone Specimens Subjected to High Temperature

Ping

Zhang

Hai-peng

et al. 2020

Advances in Civil Engineering

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To study the effect of high temperature on the dynamic mechanical properties and energy evolution characteristic of limestone specimens, the basic physical parameters of limestone specimens that cool naturally after experiencing high temperatures of room temperature (25°C), 200°C, 400°C, and 600°C were tested. In addition, compression tests with 6 impact loading conditions were conducted using SHPB device. The changes of basic physical properties of limestone before and after temperature were analyzed, and the relationship among dynamic characteristic parameters, energy evolution characteristics, and temperature was discussed. Test results indicated that, with the increase of temperature, the surface color of specimen changed from gray-black to gray-white, and its volume increased, while the mass, density, and P-wave velocity of specimen decreased. The dynamic compressive stress-strain curve of limestone specimens after different high-temperature effects could be divided into three stages: elasticity stage, yield stage, and failure stage. Failure mode of specimen was in the form of spalling axial splitting, and the degree of fragmentation increased with the increase of the temperature and incident energy. With the increase of the temperature, the reflection energy, the absorption energy, the dynamic compressive strength, and dynamic elastic modulus of rock decreased, while its transmission energy, the dynamic peak strain, and strain rate increased. The dynamic compressive strength, dynamic elastic modulus, dynamic strain, and strain rate of limestone specimens all increased with the increase of incident energy, showing a quadratic function relationship.

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Investigation of Impact Compressive Mechanical Properties of Sandstone After as well as Under High Temperature

Cited by 8 publications

References 20 publications

Effect of hydrothermal coupling on energy evolution, damage, and microscopic characteristics of sandstone

Effect of hydrothermal coupling on energy evolution, damage, and microscopic characteristics of sandstone

Shear Strength and Energy Evolution of Granite under Real-Time Temperature

Experimental Study on Dynamic Mechanical Properties and Energy Evolution Characteristics of Limestone Specimens Subjected to High Temperature

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