Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Abstract

This work discusses the results from tests conducted to investigate the uniaxial compression and creep behavior of red sandstone. An original untreated sample and an 800°C treated sample were selected to carry out the experiments. High temperature had an obvious influence on the mechanical properties of the red sandstone. The relationship between creep strain and instantaneous strain, as well as the instantaneous deformation modulus and creep viscosity coefficient, was analyzed. High temperature reduced the ability of the red sandstone to resist instantaneous deformation and creep deformation. Acoustic emission (AE) technology was also used in the loading process of uniaxial compression and creep tests, providing a powerful means for damage evolutionary analysis of the red sandstone.

Saturated water‐weakening effects on the compressive behavior of thermally damaged granite

“…A detailed understanding of the compressive behavior of granite under environments of high temperature and water is critical for deep underground exploration and engineering, especially the understanding of granite, a deep hard bedrock faced commonly in the underground engineering. It is considered as the target formation for deep geothermal energy projects and host rock for nuclear waste disposals 1,2 . The understanding, on the one hand, is beneficial for optimizing the design to improve the efficiency of drilling technologies, such as hydraulic fracturing, thermal spallation drilling, or blasting 11,12 for exploring geothermal energy; on the other hand, it has great significance for designing structures within the rock of nuclear waste disposals projects.…”

“…With the increasing energy demand, exploring resources at a significant depth to access geothermal, 1,2 underground coal gasification, [3][4][5] and minerals, as well as storing nuclear waste deep underground, attracts increasing attention. 1,[5][6][7][8] The deep underground has some completely different environmental characteristics, compared with shallow layers, for example, the high temperature rising by 0.3-0.4 C/km 9 and the widely distributed groundwater.…”

“…It is considered as the target formation for deep geothermal energy projects and host rock for nuclear waste disposals. 1,2 The understanding, on the one hand, is beneficial for optimizing the design to improve the efficiency of drilling technologies, such as hydraulic fracturing, thermal spallation drilling, or blasting 11,12 for exploring geothermal energy; on the other hand, it has great significance for designing structures within the rock of nuclear waste disposals projects.…”

Experimental study on triaxial creep behavior of red sandstone under different pore pressures based on ultrasonic measurement

“…In addition, previous studies have found that the creep characteristics of sandstone is affected by many external factors, such as confining pressure, [7][8][9] temperature, [10][11][12] water content, [13][14][15] and pore pressure. [16][17][18] Pan et al 19 investigated the influence of high temperature on the creep damage behaviors of red sandstone. They found that temperature has an obvious influence on uniaxial compressive strength, Young's modulus, and failure modes of red sandstone.…”

Experimental and Analytical Investigation into the Synergistic Mechanism and Failure Characteristics of the Backfill-Red Sandstone Combination

“…In order to improve the safety of underground filling mining areas, a lot of research on the mechanical properties, loss and failure characteristics of rock and backfill have been carried out world widely [4][5][6][7]. In terms of rock damage and failure, many scholars have analyzed the damage evolution in the process of rock deformation, and failure through experimental means and established constitutive models [8][9][10][11]. Bustamante et al [12] proposed a nonlinear constitutive relation to simulate the properties of sandstone and studied the compressional and shear wave properties of rock under compression, finding that the compressional wave velocity is related to the compressive load.…”