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

Zhao, Zhongyong; Li, Weiguo; Ma, Jianzuo; Yang, Mengqing; Kou, Haibo; He, Yan; Zheng, Shifeng; Dong, Pan

doi:10.1111/ffe.13749

Cited by 3 publications

(4 citation statements)

References 53 publications

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“…Owing to the different thermal expansion coefficients and thermal conductivity of each component, rock is prone to produce flaws and cracks. Consequently, thermal damage is the other important factor influencing the TDYM of rocks (Zhao et al., 2022). The TDTFS models derived above, as well as Li’s model, strongly rely on the TDYM, while this can greatly restrict the model application because the real-time high-temperature test is hard to conduct.…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…Moreover, rocks are typical mixtures with complex compositions. The thermal mismatch among different compositions, as well as the thermal gradient, will lead to obvious thermal damage in rocks (Jiang et al., 2022; Yin et al., 2022; Zhao et al., 2022), including the forming and propagation of cracks, pores, etc. Phase transition and thermal damage are therefore two important factors in the TDTFS modeling of rocks.…”

Section: Introductionmentioning

confidence: 99%

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Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage

Zhao,

Ma,

Zheng

et al. 2023

International Journal of Damage Mechanics

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Accurately and conveniently acquiring the tensile fracture strength of rocks at different temperatures is vital no matter for the security or economical design of deep underground engineering projects. Extensive testing in the laboratory, assisted with fitting approaches, is the main method to obtain the high-temperature tensile fracture strength in the available literature. However, the high-temperature destruction test is difficult to conduct and requires numerous time and resources. In this work, considering the main physical mechanisms such as phase transition and thermal damage that affect the tensile fracture strength of rocks at high temperatures, theoretical models for predicting their temperature-dependent tensile fracture strength (TDTFS) are established based on the Force-Heat Equivalence Energy Density Principle. The presented models achieve great prediction on the different variation trends of tensile strength below and above the phase transition temperature, as well as the corresponding sudden change of strength. For rocks without phase transition, the presented model only needs some physical parameters tested at room temperature can get a good prediction capacity on the TDTFS. Moreover, a new theoretical characterization model of the equivalent thermal damage parameter was presented and take a comparison with the previous model. Finally, the potential applications and limitations of the TDTFS model are further discussed. The application threshold of the presented TDTFS models is relatively low, and they may therefore be suitable as a method for providing a rapid and preliminary evaluation of strength at a large temperature range for rock engineering.

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Section: Mathematical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage

Zhao,

Ma,

Zheng

et al. 2023

International Journal of Damage Mechanics

Self Cite

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“…In the past, many experimental studies have been carried out on the mode I fracture toughness of high temperature rocks, which indicate that the fracture toughness and most of other mechanical properties progressively degrade with the increase of temperature overall. [17][18][19][20][21][22] However, some studies show that the change trend is not always monotonous. Meredith et al 23 measured the mode I fracture toughness of Westerly granite and Black gabbro at temperatures from 20 C to 400 C in a vacuum.…”

Section: Introductionmentioning

confidence: 99%

“…Experiment is the most basic method to study the effect of temperature on fracture toughness of rocks. In the past, many experimental studies have been carried out on the mode I fracture toughness of high temperature rocks, which indicate that the fracture toughness and most of other mechanical properties progressively degrade with the increase of temperature overall 17–22 . However, some studies show that the change trend is not always monotonous.…”

Section: Introductionmentioning

confidence: 99%

Theoretical characterization of the temperature‐dependent mode I fracture toughness of rocks

Qiu,

Zhao,

Yang

et al. 2024

Fatigue Fract Eng Mat Struct

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Mode I fracture toughness, as a key index to reflect rocks' resistance to crack propagation and failure, which is significantly affected by temperature, plays an important role in accident prevention in underground engineering. In this work, a temperature‐damage‐dependent fracture surface energy model of rocks was developed first. Then, the theoretical characterization model of the temperature‐dependent mode I fracture toughness of rocks was proposed according to the relationship between the fracture surface energy and fracture toughness. All obtained experimental results are used for verification, and the predicted values are in good agreement with the experimental results. The temperature‐dependent mode I fracture toughness model of rocks established in this study not only provides a new method to predict the fracture toughness of rocks at different temperatures conveniently but also provides the theoretical basis to the research on stability analysis, monitoring, warning, and disaster control of underground rock engineering.

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The water weakening effect on the progressive slope failure under excavation and rainfall conditions

Yu,

Zhao,

Gong

et al. 2024

Bull Eng Geol Environ

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The water weakening effect refers to the gradual deterioration of soil mechanical properties under long-term saturation. This paper analyzed the impact of water weakening on slope stability under alternating excavation and rainfall. The field investigation speculated shale hydration as the cause of overall slope instability. The mechanical parameters of hydrated shale were determined by the parameter inversion and empirical estimation methods. The simulations were used to restore the process of parameter weakening and slope failure, and confirmed the fact that hydration causes landslide. Furthermore, the failure mechanism of slope and support structure under hydration were investigated. The results show that the mechanical parameters of the slope decreased linearly, whereas the plastic strain–time and total displacement-maximum shear stress curves of the hydrated shale exhibited three stages: slow initial growth, rapid growth in the middle term, and rapid increase in the later period; the rate of slope deformation and the factor of safety reduction also gradually increase over time; under middle stage of hydration, the middle to rear of shale were extruded, while the front first underwent tensile shear deformation, forming a plastic zone of at rear and front excavated slope; In the late stage, hydrated shale quickly reaches its yield limit (maximum shear stress of 270 kPa), the middle and rear shale is damaged and compresses the front, causing it to transform from tensile shear to compressive shear failure. The plastic zone in the rear extends forward and connects with the front ones, forming an overall landslide. Besides, preventing deep landslides caused by hydration through waterproofing, drainage, protection, and support for excavated slopes has proven difficult. Therefore, it is necessary to redesign treatment schemes based on the characteristics of stress, strain, and seepage.

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

Cited by 3 publications

References 53 publications

Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage

Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage

Theoretical characterization of the temperature‐dependent mode I fracture toughness of rocks

The water weakening effect on the progressive slope failure under excavation and rainfall conditions

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