Study on energy properties and failure behaviors of heat-treated granite under static and dynamic compression

Wang, Z. L.; Hao, Shiyun; Zheng, Jian; Tian, Nuocheng; Zha, Fusheng; Shi, Heng

doi:10.1080/15376494.2018.1479808

Cited by 23 publications

(7 citation statements)

References 22 publications

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“…Figure 1b and c show the geometric size of the specimens. Disc specimens were designed, and the diameter and thickness of the specimens were 50.0 mm and 25.0 mm, respectively, to reduce the influences of the inertial effect and end effect on the test results (Wang et al 2019a). The deviation of the height and diameter of specimen is within 0.50 mm during the processing.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…The dynamic behaviors of rock after thermal treatments have been extensively studied (Zhang et al 2001;Li et al 2012;Huang and Xia 2015;Yu et al 2018;Wang et al 2019a). A series of dynamic behaviors, mainly including the dynamic compressive strength (Li et al 2020a), dynamic tensile strength (Mardoukhi et al 2017), and dynamic fracture toughness (Yin et al 2018), are commonly tested using the split Hopkinson pressure bar (SHPB) system.…”

Section: Introductionmentioning

confidence: 99%

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Thermal cycling effects on the dynamic behavior of granite and microstructural observations

Gao

Fan

Wan

2021

Bull Eng Geol Environ

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This study investigated the thermal cycling effects on the dynamic behavior of granite and described its microstructure. The specimens were subjected to various numbers of thermal cycles (0, 1, 3, 5, and 7 cycles) at temperatures ranging from 25 to 500 °C. Then, ultrasonic wave tests and split Hopkinson pressure bar (SHPB) tests (with different impact gas pressures of 0.25, 0.28, and 0.31 MPa) were performed to study the thermal cycling effects on the P-wave velocity, P-wave modulus, dynamic compressive strength, and impact failure pattern of the granite specimens. Finally, scanning electron microscopy (SEM) was performed to analyze the micromechanism of the dynamic property degeneration of the granite specimens. The results show that the dynamic properties of the P-wave velocity, P-wave modulus, and dynamic compressive strength exponentially decrease as the number of thermal cycles increases. The decreases in the dynamic properties mainly occur during the first thermal cycle, and the P-wave modulus and dynamic strength decrease by 67.5% and 8.4-16.3%, respectively. Moreover, a higher dynamic compressive strength, smaller fragments, and more fine powder are generated by impact failure with a larger strain rate. Smaller fragments and more fine powder are observed after impact failure as the number of thermal cycles increases. The tests further reveal that the dynamic properties of thermally damaged granite are closely related to the microcracks induced by thermal cycling.

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Section: Specimen Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal cycling effects on the dynamic behavior of granite and microstructural observations

Gao

Fan

Wan

2021

Bull Eng Geol Environ

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“…Therefore, most researchers preferred the Split Hopkinson Pressure Bar (SHPB) testing technique under a controlled laboratory setup. Before the second decade of the 21st century, most studies focused on the dynamic response of intact rocks or rock-like materials using the SHPB compression test [14][15][16][17][18][19][20]. In recent years, some studies have investigated the crack mechanism of jointed rock mass at higher loading rate conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of dynamic loading response of grouted non-persistent jointed rock

Kumar

Tiwari

Das

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Grouting is a well-established engineering practice for stabilizing the jointed and/or fractured rock mass. This process may lead to the enhancement of the mechanical properties of fractured rocks. In the majority of the studies, the efficiency of grouting is determined under static loading conditions. Nonetheless, the grouted rock may be subjected to different dynamic loading from blasts or earthquakes. The present study explored the dynamic loading response, in terms of strength and fracture propagation, of a rock mass having a diagonal non-persistent joint (45° to the loading direction) subjected to impact loading to determine the efficiency of grout material. The focus of the study is to present a comparative assessment of different grout materials under dynamic loading. Split Hopkinson Pressure Bar (SHPB) was used to conduct the compressive impact tests on the synthetic rock mass with varying infill conditions (unfilled, cement-filled and epoxy-filled). The progressive fractures within the specimens were monitored by Photron fastcam analysis (PFA, a high-speed image analysis) and digital image correlation (DIC). The experiments highlighted that the strength of rock mass has an increasing trend with the dynamic strain rate. Epoxy resin provided a better strength enhancement than cement paste as the grout material. Due to the higher strength of epoxy resin than cement paste, the epoxy-grouted jointed rock demonstrates a similar response as the intact rock. In the case of both unfilled and cement-filled specimens, the nature of the primary crack was the coplanar shear crack. In contrast, with the injection of epoxy grout, the nature of the initial crack became the tensile or far-field tensile crack, which is often noticed in intact rocks.

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“…In the past decades, extensive efforts have been dedicated to exploring the deformation and failure properties and revealing the damage behavior of rocks based on energy theory. Considerable results were also achieved through numerical and experimental methods (Peng et al, 2014;Wang et al, 2017Wang et al, , 2020aXiao et al, 2010). For example, through numerical analysis, Wasantha et al (2021) modeled the damage evolution behavior of rocklike materials with preexisting cracks and pores under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Theoretical shear damage characterization of intact rock under compressive-shear stress considering energy dissipation

Luo

Gong

Peng

2023

International Journal of Damage Mechanics

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Investigation into rock damage is of great significance for evaluating and predicting the stability of underground rock applications, such as deep mining or tunneling structures. Considering the energy dissipation properties during rock deformation, this paper proposes a novel theoretical characterization of the damage induced by compressive-shear stress and its evolution in intact rocks. The linear energy dissipation (LED) law is derived from shear stress and deformation data of rocks resulting from the preset angle shear experiment. Based on the LED law, two damage variables are separately constructed from the theoretical and experimental aspects. Several sets of experimental data are subsequently utilized to validate the two constructed damage variables. Results show that both damage variables grow first slowly and then rapidly with shear displacement or shear stress in nonlinear relations. By comparison, however, it is found that the theoretical damage variable outperforms the experimental damage variable, which can accurately reflect the stress and deformation data during progressive rock damage with favorable continuity. This study contributes to a novel theoretical approach to quantifying the pre-peak damage in intact rocks subject to compressive-shear stress.

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Study on energy properties and failure behaviors of heat-treated granite under static and dynamic compression

Cited by 23 publications

References 22 publications

Thermal cycling effects on the dynamic behavior of granite and microstructural observations

Thermal cycling effects on the dynamic behavior of granite and microstructural observations

Experimental assessment of dynamic loading response of grouted non-persistent jointed rock

Theoretical shear damage characterization of intact rock under compressive-shear stress considering energy dissipation

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