Experimental Study on the Mechanical Characteristics of Saturated Granite under Conventional Triaxial Loading and Unloading Tests

Liu, Zelin; Yi, Wei-Jian

doi:10.3390/su14095445

Cited by 5 publications

(2 citation statements)

References 65 publications

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“…Liu et al [35] conducted a series of conventional triaxial unloading tests to analyze the mechanical properties, strain energy evolution characteristics, and failure modes of saturated rock masses, and their findings are of great significance for strength calculation, safety assessment, and disaster prevention and control.…”

Section: Guarantee For Mining Production Safetymentioning

confidence: 99%

Mining Safety and Sustainability—An Overview

2022

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Section: Guarantee For Mining Production Safetymentioning

confidence: 99%

Mining Safety and Sustainability—An Overview

2022

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“…The excavation-induced unloading effect is considered a major reason for the large deformation phenomenon of the surrounding rock [1], and researchers have conducted extensive studies on this issue [2,3]. Volume dilatancy phenomena have been widely observed in laboratory studies and attracted strong interest from researchers [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Dilatancy and Energy Evolution Behaviors of Red-Bed Rocks under Unloading Conditions

Zheng,

Liu,

Zhuo

et al. 2023

Materials

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Surrounding rock deformation and consequent support failure are the most prominent issues in red-bed rock tunnel engineering and are mainly caused by the effects of unloading, rheology, and swelling. This study investigated the mechanical responses of two kinds of red-bed mudstone and sandstone under unloading conditions via laboratory observation. Volume dilation was observed on the rocks during unloading, and the dilatancy stress was linear with the initial confining pressure. However, the ratios of dilatancy stress to peak stress of the two rocks kept at a range from 0.8 to 0.9, regardless of confining pressures. Both the elastic strain energy and the dissipated energy evolved synchronously with the stress–strain curve and exhibited conspicuous confining pressure dependence. Special attention was paid to the evolution behavior of the dilatancy angle. The dilatancy angle changed linearly during unloading. When the confining pressure was 10 MPa, the dilatancy angle of mudstone decreased from 26.8° to 12.5° whereas the dilatancy angle of sandstone increased from 34.6° to 51.1°; when the confining pressure rose to 25 MPa, the dilatancy angle of mudstone and sandstone decreased from 45.8° to 17.4° and increased from 21.7° to 39.5°, respectively. To further understand the evolution of the dilatancy angle, we discussed the links between the variable dilatancy angle and the processes of rock deformation and energy dissipation.

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Effect of thermal treatment and moisture content on the mechanical properties of soft sandstone under triaxial extension: an experimental study

Liu

Wei

2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The problem of deformation damage of soft rocks and the effect of temperature and moisture content on the mechanical properties of rocks has received wide attention in recent decades. To investigate the effect of thermal treatment and moisture content on the triaxial extension mechanical properties and fracture characteristics of soft rock, triaxial extension tests were conducted on sandstone specimens with good homogeneity at different heating temperatures (T = 25, 100, 200, 300, 400, 500, 800 °C) and moisture contents (Kt = 0, 20, 50, 80, 100%) with the help of MTS815 testing machine. The results showed that: For rock specimens with Kt = 0, the mass of the specimens decreased monotonically with the increase of temperature, the elastic modulus (E) showed an overall decreasing trend, and the axial ultimate strain (εamax) was Ω-like pattern. The P-wave velocity (Vp) and axial stress showed a trend of increasing first and then decreasing around T = 200 °C. All the specimens fractured instantaneously, and the SEM images showed some grain expansion before T ≤ 200 °C. At the same time, microcracks expand and become more intense after T > 200 °C. In addition, the multiple mineral compositions in the specimens showed more complex changes after different thermal treatments, which was another main reason for the deterioration of the specimens. Furthermore, the E decreases while εamax increases with the moisture content, and before T = 500 °C and Kt = 20%, the Kt significantly influences the triaxial extension strength; after that, however, the effect is minimal.

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Experimental Study on the Mechanical Characteristics of Saturated Granite under Conventional Triaxial Loading and Unloading Tests

Cited by 5 publications

References 65 publications

Mining Safety and Sustainability—An Overview

Mining Safety and Sustainability—An Overview

Experimental Study on the Dilatancy and Energy Evolution Behaviors of Red-Bed Rocks under Unloading Conditions

Effect of thermal treatment and moisture content on the mechanical properties of soft sandstone under triaxial extension: an experimental study

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