Anisotropy on the ductile-to-brittle transition for rock in process of drilling

He, Mingming; Wang, Jing; Yuan, Zhuoya; Wang, Haoteng; Ma, Xudong; Luo, Bo

doi:10.1007/s11600-023-01017-4

Cited by 10 publications

(2 citation statements)

References 46 publications

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“…Deep-seated rock engineering endeavors, encompassing foundational excavations, hydraulic passageways, and nuclear waste management undertakings, have gained increasing significance. These rock mass projects are subject to extremely complex load conditions that involve not only the influence of static loads but also dynamic loads like explosions, earthquakes, and vibrations [1][2][3]. Compared to static loads, rock masses under dynamic loads undergo cumulative damage and fatigue degradation, leading to significant changes in their mechanical and energy evolution characteristics [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Energy Dissipation in T-Shaped Fractured Rocks under Different Loading Rates

Zhang,

Zhong,

Pang

et al. 2023

Sustainability

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T-shaped fractured rocks in the engineering rock mass with different inclination angles, quantities, and cross patterns will cause slope landslides, cavern collapse, roof fall, and other disasters under the action of external forces. Deformation evolution of the T-shaped fractured rock is also significant for monitoring the stability of rock engineering structures. In this paper, the compression test of T-shaped fracture specimens was carried out under different loading rates. By modulating both the fracture inclination angle and the loading rate, the attributes pertaining to energy dissipation in the T-shaped fractured specimen were scrupulously scrutinized and subsequently expounded upon. The difference in the energy characteristics between fractured rock and intact rock was investigated to understand the deformation evolution of T-shaped fractured rock samples. The results show that when the fracture angle is 45° and 90°, the elastic strain energy and dissipated energy decrease as the secondary fracture angle increases. At the peak point, as the secondary fracture angle increases from 0°, the total absorbed energy, elastic strain energy, and dissipated energy of the T-shaped fractured rock increase, the ratio Ue/U of elastic strain energy to total energy increases, and the ratio Ud/U of dissipated energy to total energy decreases. The increase in loading rate leads to an increase in Ue/U and a decrease in Ud/U at the peak point of the T-shaped fractured rock specimen. The increase in loading rate leads to an increase in the total absorbed energy and elastic energy at the peak point of the T-shaped fractured rock, while the dissipated energy decreases. Investigative endeavors into the mechanics and energetic attributes of T-shaped fractured rocks bestow pragmatic and directive significance upon the safety assessment and stability prognostication of sundry geological undertakings.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Energy Dissipation in T-Shaped Fractured Rocks under Different Loading Rates

Zhang,

Zhong,

Pang

et al. 2023

Sustainability

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“…This phenomenon becomes evident through the varying elastic modulus acquired from identical rock samples when subjected to different loading directions [1]. The anisotropy of rock materials complicates the determination of mechanical properties complex in practical engineering, which places urgent demands for design and construction [2][3][4][5][6]. Many scholars have studied the anisotropy of rock according to the rock strength characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Anisotropy of Rocks Using Digital Drilling Technology

Liu,

Ma,

et al. 2023

Sustainability

Self Cite

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Accurate determination of rock anisotropy is of great significance for analyzing the safety and stability of engineering rock mass. In this paper, uniaxial compression tests are carried out on four kinds of rocks: slate, gneiss, sandstone and shale, to obtain the uniaxial compressive strength of each rock in the different directions. Digital drilling tests are carried out on four kinds of rocks to study the anisotropy of drilling parameters. According to the working principle of the drill bit, its force balance analysis model is established, and the concept of cutting strength ratio is proposed. Using the drilling parameters (drilling depth, drilling time, torque and thrust, etc.) in the different directions for each rock, the interrelationships between them are analyzed. The anisotropy index of rock is defined according to the ratio of cutting strength in different directions of drill parameters, and a new method for judging rock anisotropy is proposed. The results show that the thrust and torque in all directions of the rock increase with the drilling depth. The torque in all directions of the rock has a positive linear relationship with the thrust. The ranking of the anisotropy degree for the four types of rocks is as follows: gneiss > slate > shale > sandstone. The anisotropy results have been validated by an alternative method utilizing uniaxial compressive strength. The determination results are verified by the uniaxial compressive strength of the rocks, and the degree of anisotropy of the four rocks is consistent with the determination results. This method can help engineers analyze the anisotropy of rock, and provide a new idea for studying the integrity and stability of rock mass.

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Effect of Water-Induced Rock Softening on Rock Anisotropy During Drilling Process

Ding,

2024

Rock Mech Rock Eng

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Anisotropy on the ductile-to-brittle transition for rock in process of drilling

Cited by 10 publications

References 46 publications

Characteristics of Energy Dissipation in T-Shaped Fractured Rocks under Different Loading Rates

Characteristics of Energy Dissipation in T-Shaped Fractured Rocks under Different Loading Rates

Experimental Investigation on Anisotropy of Rocks Using Digital Drilling Technology

Effect of Water-Induced Rock Softening on Rock Anisotropy During Drilling Process

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