Thermal effects on shearing resistance of fractures in Tak granite

Khamrat, Supattra; Thongprapha, Thanittha; Fuenkajorn, Kittitep

doi:10.1016/j.jsg.2018.03.011

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…The effect of temperature on the shear strength of joints has been scarcely studied. Some studies were focused on the evaluation of the shear strength of rock discontinuities that were subjected to thermal treatments at different temperatures (up to 800 • C) by means of direct shear tests [37][38][39]. These results show a gradual decline of the peak shear strength as the temperature increases under normal loading condition.…”

Section: Effects Of Wildfires On the Rock Mass: Source Areamentioning

confidence: 99%

A brief review of the effect of wildfires on rockfall occurrence

Pérez-Rey

Sarro

Tomás

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Wildfires and rockfalls are among the major hazards in forested mountainous regions across Europe. Understanding processes and conditions that lead to rockfalls during and after a wildfire in different geological contexts is, therefore, of great relevance. The increase of rockfalls associated with the occurrence of wildfires is connected to several factors, not only in the detached area but also in the propagation and affected area. Wildfires cause changes in the mechanical properties of rocks and discontinuities as well as the loss of protective capacity from vegetation, complemented by the effect induced by firefighting activities and by extreme temperatures that may deteriorate the installed protective measures. After the occurrence of a wildfire, there is an increase in the frequency and intensity of rockfalls in the burned area, causing a major impact of rockfalls on road networks and inhabited areas. Additionally, the rockfall risk perception is usually increased due to the removal of vegetation by wildfires, exposing both rock blocks and the rock mass. In this review, the main factors that influence the occurrence of rockfalls after a wildfire are briefly reviewed.

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Section: Effects Of Wildfires On the Rock Mass: Source Areamentioning

confidence: 99%

A brief review of the effect of wildfires on rockfall occurrence

Pérez-Rey

Sarro

Tomás

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…The effect of temperature on the shear strength of joints has been scarcely studied. Some studies were focused on the evaluation of the shear strength of discontinuities that were subjected to thermal treatments at different temperatures (up to 800 • C) by means of a direct shear test [77][78][79][80]. These results showed a gradual decline of the shear strength-peak as the temperature increased under normal loading conditions.…”

Section: Source Area: Effects Of Fires On the Rock Massmentioning

confidence: 99%

Effects of Wildfire on Rockfall Occurrence: A Review through Actual Cases in Spain

et al. 2021

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Understanding processes and conditions that lead to rockfalls during and after a wildfire in different geological contexts is crucial since this phenomenon is one of the major hazards in mountainous regions across Europe. Spain is one of the European countries with the highest rate of wildfires, and rockfalls cause high economic and social impact, with many fatalities every year. The increase of rockfalls during and after wildfires is connected with the merging of different factors, not only in the detached area but also in the propagation and potentially affected area. When wildfire occurred, many actions take place: changes in the mechanical conditions of the rocks, the loss of protective capacity from vegetation, the effect induced by firefighting activities and/or the impact by the high temperatures in the adopted protective measures. After the wildfire, there is an increase in frequency and intensity of rockfalls in the burned area, causing a major impact of rockfalls on not only road networks and built-up areas but also people living. Additionally, the removal of vegetation by wildfires causes an increase in the risk perception, related not only to detached blocks but also to the general appearance of the rock mass. In this review, the main factors that influence the occurrence of rockfalls after a wildfire are analyzed, and three actual case studies in Spain are presented to support the variety of conclusions obtained.

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“…Many previous works studied the shear failure of rock mass by laboratory or in situ direct shear tests [4][5][6]. Accurate determination of rock shear strength by laboratory direct shear test on small scaled specimens is the premise of comprehensive understanding of large scale in situ behaviors of rock mass, which has been studied by many scholars [7,8]. Laboratory direct shear tests are concentrated in two kinds of works: one kind is for rock joints [9][10][11], and the other kind is for rock bridge (i.e., nonpersistent joints in rock mass) [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Shear Failure of Freeze-Thawed Tibet Hornfels Subjected to Multilevel Cyclic Shear (MLCS) Loads: Insights into Structural Dependent Failure Characteristics

Wang

Xia

2022

Lithosphere

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Shear instability behavior is typical failure mode of rock mass in civil and mining engineering. Many attempts have been performed for rock joints or nonpersistent rock bridge under static shear conditions, yet the shear failure of rock mass subjected to cyclic or fatigue shear conditions is not well understood. Multilevel cyclic shear (MLCS) loading experiments were carried out on freeze-thawed hornfels to reveal the fracture and energy evolution characteristics using a self-special designed rock dynamic shear testing apparatus. The effect of the preexisting natural fracture on rock shear strength, deformation, energy dissipation, and shear failure pattern were experimentally investigated. The testing results show that aperture of open-mode fractures increases quickly, and this kind of natural fracture contributed a lot to rock failure. The evolution of stress hysteresis loop and its pattern are impacted by natural fracture, and it determines the damage accumulation. In addition, a damage evolution model was proposed to describe the damage evolution defined by the dissipated energy; the model can well describe the two-stage damage propagation for each cyclic stage and the entire cyclic loading process. Good agreement was found among the irreversible strain, energy dissipation, and failure morphology that are influenced by the preexisting natural fractures. It is suggested that the rock dynamic shear failure behaviors are rock structural dependent; the disturbed stress alters the energy dissipation and release characteristics.

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Thermal effects on shearing resistance of fractures in Tak granite

Cited by 18 publications

References 25 publications

A brief review of the effect of wildfires on rockfall occurrence

A brief review of the effect of wildfires on rockfall occurrence

Effects of Wildfire on Rockfall Occurrence: A Review through Actual Cases in Spain

Dynamic Shear Failure of Freeze-Thawed Tibet Hornfels Subjected to Multilevel Cyclic Shear (MLCS) Loads: Insights into Structural Dependent Failure Characteristics

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