Investigation Into Deformation and Failure Characteristics of the Soft-Hard Interbedded Rock Mass Under Multiaxial Compression

Li, Ang; Shao, Guojian; Li, Yaodong; Sun, Yang; Su, Jingbo; Liu, Juncheng

doi:10.3389/feart.2022.903743

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…Both were confirmed to share the same elastic space. The Z-P constitutive model took into account the influence of the intermediate principal stress on the strengthening effect of rock strength [35,36].…”

Section: Program Correctness Verificationmentioning

confidence: 99%

Research on Constitutive Model and Algorithm of High-Temperature-Load Coupling Damage Based on the Zienkiewicz–Pande Yield Criterion

Zhan,

Jiang,

Shan

et al. 2023

Applied Sciences

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The mechanical properties of rock can be weakened under the influence of high temperatures. To describe the mechanical behavior of rock under the action of high temperature more accurately, based on the Zienkiewicz–Pande yield criterion, the damage variable Dc which accounts for the coupling between high temperature and load is introduced. According to plastic potential theory and plastic flow law, the iterative incremental method for a high-temperature and load-coupled damage constitutive model in Flac3D is deduced in detail and compiled into the corresponding dynamic link library file (.dll file). By modifying the shape function to degenerate into the Mohr–Coulomb constitutive model, an elastic–plastic analysis of an ideal circular tunnel is performed, and a comparison is made between calculation results obtained from the built-in Mohr–Coulomb constitutive model in Flac3D, proving the correctness of the secondary development program. Finally, numerical simulations are conducted to study the effects of high-temperature damage using rock uniaxial compression tests, and the model’s validity is established by comparing it with previous experimental results.

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Section: Program Correctness Verificationmentioning

confidence: 99%

Research on Constitutive Model and Algorithm of High-Temperature-Load Coupling Damage Based on the Zienkiewicz–Pande Yield Criterion

Zhan,

Jiang,

Shan

et al. 2023

Applied Sciences

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“…In the realm of research on the collapse and instability mechanisms of slopes in alternating soft and hard strata, numerous scholars have utilized numerical simulation methods to construct numerical models of such slopes and analyze 2 / 20 their deformation and failure mechanisms. For instance, Delved into the failure mechanism and evolution process of stratigraphic slopes (Yikang et al 2023;Alejano et al 2010;Hao et al 2020;Li et al 2022;Hua et al 2018;Mu et al 2022;Gallage et al 2021;Li et al 2023;Bolla and Paronuzzi 2020). Examined how sandstone and mudstone softening affects tunnel stability (Li et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Study on slope collapse instability mechanism of Jurassic soft and hard alternate strata in Three Gorges Reservoir Area

PENG,

ZUO,

TONG

et al. 2024

Preprint

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The Three Gorges Reservoir area features widespread, thick, and well-developed Jurassic soft and hard strata, leading to complex deformation, failure modes, and instability mechanisms on slopes. This can result in collapse disasters. Focusing on the Zigui Basin in the Three Gorges Reservoir area, our study investigated the topographic and geomorphological characteristics of both artificial and natural slopes, the thickness of soft and hard phases, crack expansion, and established a geomechanical model for slope collapse in the Jurassic formations. Utilizing UDEC7.0 software, we conducted numerical tests to analyze the impact of various factors such as slope angle, rock formation inclination angle, slope height, ratio of hard and soft rock thickness, structural surface strength, and mechanical parameters of rock formations on slope stability. Through numerical simulations based on the geomechanical model, we examined the mechanisms of slope collapse and instability in the Jurassic strata, ultimately developing a model for slope deformation and failure. The research findings indicate that geomechanical modes of slope failure in soft and hard strata can be categorized into three types: push collapse, slip collapse, and toppling collapse. Upon analysis, it is observed that model No. 1 demonstrates push collapse, while model No. 6 experiences slip collapse. Model No. 19 ultimately succumbs to toppling collapse. The inclination angle \(\beta\) of the rock layer significantly influences the instability and failure mechanism of slopes in soft and hard strata. Specifically, when the slope aligns with the direction of the slope and \(\beta\)<\(\alpha\), failure occurs initially through layer creep followed by shear slip. Conversely, when \(\beta\)>\(\alpha\), the upper rock mass experiences layer slip while the lower rock mass undergoes buckling deformation. In the case of the slope facing in the opposite direction, a small \(\beta\) results in toppling deformation, whereas a large \(\beta\) leads to local collapse at the slope's peak. Different failure modes exhibit distinct crack development patterns. Under the influence of gravity load, push collapse progresses from internal micro cracks to the downward pushing and destruction of the rock layer. Slip collapse is characterized by cracks initiating at the front edge and extending to form a “z”-shaped penetration. Toppling collapse involves the appearance of local micro-cracks at the slope's upper portion, gradually propagating along the slope surface from top to bottom. The process of different failure modes can be divided into three stages: an initial creep stage before approximately 21g, a steady-state deformation stage between 21g and 40g, and an instability collapse stage after around 40g.

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“…Therefore, scholars have researched the mechanical properties and engineering applications of interlayered rock bodies. In the direction of mechanical properties, scholars have analyzed the influence of interlayer thickness, angle, and layer-thickness ratio on the strength characteristics of interlayer rock bodies as influencing factors [1][2][3] and came up with the optimal combination of rock body strength 4 . Shen et al 5 mainly stood at the level of inclination angle.…”

Section: Introductionmentioning

confidence: 99%

Analysis of blasting characteristics of interbedded rock mass based on particle expansion method

Xu,

Xie,

Liu

et al. 2023

Preprint

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In engineering, blasting is often used to achieve engineering purposes. Still, more studies are limited to a single rock layer, and there are few details on complex rock layers, such as interbedded rock bodies. This paper analyses the effects of the blasting environment, layer thickness, and inclination angle on the blasting effect from the levels of reflected stress, cracking state, and contact resultant force with the help of the particle expansion method. It is found that: (i) The blasting environment and layer thickness greatly influence the blasting effect, while the inclination angle has a minor influence. (ii) When the layer thickness in a hard rock environment is less than seven times the radius of the crushing zone, the reflective stress near the contact surface increases with the layer thickness, conversely, it decreases. (iii) For hard rock environments with layer thicknesses up to 3 times the radius of the crushing zone, the number of cracks increases with layer thickness at a rate of 68% per meter, conversely, it decreases at a rate of 6.5% per meter. For soft rock environments with layer thicknesses up to 1 times the radius of the crushing zone, the number of cracks decreases at a rate of 112% per meter with layer thickness. It increases at a rate of 10% per meter for layers between 1 and 2 times the radius of the crushing zone. (iv) The average contact resultantforce increases at a rate of 15.4% per meter when the layer thickness gradually increases to 10 times the radius of the crushing zone for hard rock environments and decreases at a rate of 51.7% per meter when the layer thickness increases to 1.5 times the radius of the crushing zone for soft rock environments, and converges if the layer thicknesses continue to increase for both soft rock and hard rock environments.

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Investigation Into Deformation and Failure Characteristics of the Soft-Hard Interbedded Rock Mass Under Multiaxial Compression

Cited by 4 publications

References 23 publications

Research on Constitutive Model and Algorithm of High-Temperature-Load Coupling Damage Based on the Zienkiewicz–Pande Yield Criterion

Research on Constitutive Model and Algorithm of High-Temperature-Load Coupling Damage Based on the Zienkiewicz–Pande Yield Criterion

Study on slope collapse instability mechanism of Jurassic soft and hard alternate strata in Three Gorges Reservoir Area

Analysis of blasting characteristics of interbedded rock mass based on particle expansion method

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