Anisotropic fracture and energy characteristics of a Tibet marble exposed to multi-level constant-amplitude (MLCA) cyclic loads: A lab-scale testing

Wang, Y.; Yi, Yuan Fu; Li, C.H.; Han, Jiajun

doi:10.1016/j.engfracmech.2021.107550

Cited by 59 publications

(44 citation statements)

References 30 publications

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“…Plenty of studies have been reported about the energy evolution characteristics of rock [18][19][20][21][22][23][24][25]. It has been widely proved 9 Geofluids that damage and fracturing of rock is energy-driven; energy conversion is the essential response of rock during deformation.…”

Section: Discussionmentioning

confidence: 99%

“…It has been widely proved 9 Geofluids that damage and fracturing of rock is energy-driven; energy conversion is the essential response of rock during deformation. The previous studies are focused on energy evolution for intact ore preflaw rocks [18][19][20][21]; investigation on the energy dissipation and release for naturally fractured rock is not common. This work reveals the influence of different kinds of natural fracture on the energy evolution, and multilevel cyclic loading testing was carried out to mimic stress disturbance for rock.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, there are considerable advantages to select energy as damage variable compared to other parameters. After a detailed literature review, it is obvious that plenty of studies have been performed for rock under static loading conditions, including uniaxial compression [17,18], triaxial compression [19,20], tensile stress [21,22], dynamic compression [23,24], and unloading process [25,26]; energy conversion during rock deformation has been well investigated. However, for rock subjected to cyclic loads, rock damage evolution using the energy method is relatively few.…”

Section: Introductionmentioning

confidence: 99%

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Research on Fracture and Energy Evolution of Rock Containing Natural Fractures under Cyclic Loading Condition

Li¹,

Wang

Shuo

et al. 2021

Geofluids

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For rock engineering in cold regions, the naturally fractured rock is susceptible to repeated freeze-thaw (F-T) weathering, coupled fatigue conditions of freeze-thaw (F-T), and stress disturbance act on rock mass, which can lead to the instability of rock engineering and even occurrence of geological hazards. Knowledge of how natural fracture affects the overall fracture evolution of freeze-thawed rock is crucial to rock mass stability. Laboratory multilevel cyclic loading tests are conducted to reveal the fatigue behavior and energy evolution for naturally fractured marble, as well as the influence of natural fracture volume on fracture evolution. The test results show that the preexisting natural fracture impacts fatigue strength, lifetime, and energy dissipation. The dissipated energy is correlated to all kinds of natural fracture (i.e., opening-mode, closing-mode, and filling-mode), and it decreases with the increase of the total natural fracture volume. The dissipated energy presents a first slow and then faster pattern as the cycle number grows. Compared with newly formed cracks, the proportion of energy consumed by stimulating natural cracks is smaller.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on Fracture and Energy Evolution of Rock Containing Natural Fractures under Cyclic Loading Condition

Li¹,

Wang

Shuo

et al. 2021

Geofluids

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“…can be weaker than the intact rock. The current research focuses on the failure criterion of the anisotropic rock, such as the Mohr-Coulomb, Drucker-Prager, the Modified Lade, Hoek-Brown, single-weak plane failure criterion, and 3D criteria (Mogi-Coulomb, Wiebols-Cook, Desai-Salami, 3D Hoek-Brown) [1][2][3][4]. The 3D criteria focus on the effects of the intermediate principal stress, which is usually difficult in practice to analyze the wellbore stability because of the more required input parameters.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Experimental Investigations on Mechanical Properties of Weak Plane Bedding in Mudstone

et al. 2021

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Wellbore instabilities frequently occur in mudstone formation with weak plane bedding because of strong anisotropies. The mechanics parameters of weak plane bedding are of vital significance to the wellbore stability analysis for mudstone formations. The conventional method for determining the mechanics parameters is to fit lots of triaxial test data due to the blindness of coring. In this paper, an evaluation method of the mechanics parameters of weak plane bedding is proposed to improve the accuracy of weak plane bedding mechanical properties. The mechanics parameters of weak plane bedding are obtained by combing the single-weak plane failure criterion with the compressive strength of rock obtained by the triaxial test of cores with different coring angles. It is seen that the new evaluation method is simple and convenient. On the other hand, a validation method of the mechanics parameters of weak plane bedding is proposed to ensure their accuracy. The compressive strength obtained from the core with the special coring angle is compared with the theoretical compressive strength for verifying the accuracy of weak plane bedding mechanical properties. It is observed that the proposed evaluation and validation methods can be used to measure the value of weak plane bedding mechanical properties precisely. The proposed methods are general and can be used for measuring the mechanical properties of fracture weak-plane and joint weak-plane.

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“…This will pose serious risks to people's lives and properties. Consequently, it is significant to investigate tunneling-induced ground movements and pile group responses [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Temporal-Spatial Characteristics of Ground and Pile Responses to Twin Shield Tunneling in Clays

et al. 2021

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This paper investigates the temporal-spatial characteristics of ground displacements as well as vertical and horizontal displacements and axial forces in existing piles induced by twin shield tunneling in clays. To that end, a case study and three-dimensional (3D) finite element (FE) analysis were performed. Based on the in situ monitoring data from the presented twin tunneling case history with existing piles beneath, the adopted 3D FE method was validated to be competent to yield reasonable simulation results. The validated 3D FE method was then used to analyze the effects of the distance between the tunnel and the pile, the distance between tunnel faces, and the pile length on the horizontal and vertical displacements and axial stresses in piles. It was found that the horizontal displacement distribution forms along the pile shaft for the front piles are similar to that for the back piles, whereas the magnitudes of the horizontal displacements of the front piles are slightly larger than that of the back piles. The interactions between piles in the pile group provide protection of the middle piles in the pile group against twin tunneling effects. With a reduction in the distance between the tunnel and the pile, the pile displacements and stresses increase nonlinearly. With an increase in the distance between tunnel faces, the maximum positive pile displacements and the maximum and minimum axial pile stresses increase, while the maximum negative pile displacements and the difference between the maximum and minimum axial pile stresses decrease.

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Anisotropic fracture and energy characteristics of a Tibet marble exposed to multi-level constant-amplitude (MLCA) cyclic loads: A lab-scale testing

Cited by 59 publications

References 30 publications

Research on Fracture and Energy Evolution of Rock Containing Natural Fractures under Cyclic Loading Condition

Research on Fracture and Energy Evolution of Rock Containing Natural Fractures under Cyclic Loading Condition

Analytical and Experimental Investigations on Mechanical Properties of Weak Plane Bedding in Mudstone

Temporal-Spatial Characteristics of Ground and Pile Responses to Twin Shield Tunneling in Clays

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