Support on Deformation Failure of Layered Soft Rock Tunnel Under Asymmetric Stress

Yang, Xiao‐Jun; Wei, Ming; Zhang, Weiran; Zhu, Chun; Mao, Yadong; Wang, Xiang; He, Manchao; Tao, Zhigang

doi:10.1007/s00603-022-03053-w

Cited by 22 publications

(2 citation statements)

References 28 publications

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“…In the event of high-stress conditions, rock burst damage can even occur, presenting significant challenges to the tunnel construction, support, and long-term stability [1][2][3][4]. In underground engineering, tunnels are typically circular or straight-walled arched [3,[5][6][7]. However, during the construction process, various shapes may emerge for tunnels such as traffic tunnels, connecting tunnels, and water curtain tunnels, owing to the different construction methods employed.…”

Section: Introductionmentioning

confidence: 99%

The Fracture Evolution Mechanism of Tunnels with Different Cross-Sections under Biaxial Loading

Jia,

Qiu,

Cong

et al. 2024

Processes

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Biaxial compression tests based on an elliptical tunnel were conducted to study the failure characteristics and the meso-crack evolution mechanism of tunnels with different cross-sections constructed in sandstone. The progressive crack propagation process around the elliptical tunnel was investigated using a real-time digital image correlation (DIC) system. Numerical simulations were performed on egg-shaped, U-shaped, and straight-walled arched tunnels based on the mesoscopic parameters of the elliptical tunnel and following the principle of an equal cross-sectional area. The meso-crack evolution and stress conditions of the four types of tunnels were compared. The results show that (1) fractures around an elliptical tunnel were mainly distributed at the end of the long axis and mainly induce slabbing failure, and the failure mode is similar to a V-shaped notch; (2) strain localization is an important characteristic of rock fracturing, which forebodes the initiation, propagation, and coalescence paths of macro-cracks; and (3) the peak loads of tunnels with egg-shaped, U-shaped, and straight-walled arched cross-sections are 98.76%, 97.56%, and 90.57% that of an elliptical cross-section. The elliptical cross-section shows the optimal bearing capacity.

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Section: Introductionmentioning

confidence: 99%

The Fracture Evolution Mechanism of Tunnels with Different Cross-Sections under Biaxial Loading

Jia,

Qiu,

Cong

et al. 2024

Processes

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show abstract

“…The expansion boundary of the unloading test starts from the unloading point, which is different from the expansion rate of the uniaxial and triaxial compression tests. Rapid unloading promotes the growth of cracks, and larger inelastic strains appear at lower unloading rates [31,32], which will increase the permeability of the rock [33][34][35][36]. In addition, the response of the ratio of height to diameter [37] and the acoustic emission behaviour [38] are also investigated, and the damage process can be observed by CT technique [39] and nuclear magnetic resonance technique [40,41].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Characteristics of Saturated Granite under Conventional Triaxial Loading and Unloading Tests

Liu

2022

Sustainability

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It is essential to study the mechanical properties of saturated rock under different loading and unloading paths for strength calculation, safety assessment and disaster prevention; however, current literature rarely mentions conventional triaxial loading and unloading conditions. To analyze the mechanical properties, strain energy evolution characteristics and failure mode, a series of conventional triaxial unloading tests (with axial loading rate va of 0.06–6 mm/min and circumferential unloading rate vu of 0.1–10 MPa/s) and conventional triaxial compression tests were carried out on saturated granite. The test results showed that the damage sources of specimens in the conventional triaxial unloading test were mainly related to circumferential deformation, while in the conventional triaxial compression test, it was related to the axial deformation. Under the same va, the confining pressure and axial stress at the failure point decreased with the increase of vu, and the stress coordinate of the failure point was located outside the conventional triaxial compression envelope of σ1–σ3. As vu increases, except for the variation of circumferential strain energy DUc decreasing slowly, the trend of strain energy changes must be determined together with va. As va increases, the relationship between the magnitude of each energy changes from DUa > DU > DUd > DUe > DUc to DUd > DUa > DU > DUe > DUc, while the change of dissipated energy is dominated by vu and va together to become dominated by va. In addition, with the increase of vu and va, the damage pattern of the specimen also changes from shear damage in a single shear plane to mixed damage with tensile strain failure and shear plane during which the dilation angle of the specimen increases in total except for vu = 10 MPa/s, va = 0.6 mm/min and 6 mm/min.

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Effect of Roof Cutting Technology on Broken Roof Rock Bulking and Abutment Stress Distribution: A Physical Model Test

Yang,

Zhang

et al. 2024

Rock Mech Rock Eng

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Support on Deformation Failure of Layered Soft Rock Tunnel Under Asymmetric Stress

Cited by 22 publications

References 28 publications

The Fracture Evolution Mechanism of Tunnels with Different Cross-Sections under Biaxial Loading

The Fracture Evolution Mechanism of Tunnels with Different Cross-Sections under Biaxial Loading

Experimental Study on the Mechanical Characteristics of Saturated Granite under Conventional Triaxial Loading and Unloading Tests

Effect of Roof Cutting Technology on Broken Roof Rock Bulking and Abutment Stress Distribution: A Physical Model Test

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