Experimental study on mechanical properties of multi-layered rock mass and statistical damage constitutive model under hydraulic-mechanical coupling

Zhang, Tao; Xu, Weiya; Huang, Wei; Wu, Guanye

doi:10.1080/19648189.2020.1763841

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…Under the assumption that any tunnel section is parallel to the isotropic plane, the analytical solution for stress and displacement around any tunnel has been derived [28][29] . There is also comprehensive research on the stress distribution, deformation, and failure characteristics of surrounding rock in layered rock masses [30][31][32][33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

Analytical expression of displacement of circular double tunnels in transversely isotropic rock mass in unstable rock zone of southwest mountainous area

Wei,

Zhang

2023

Preprint

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Due to the instability of the underground rock structure in the southwest mountain area, the influence of different pore shapes on the rock mechanics performance and fracture characteristics under uniaxial compression changes. The analysis and research on the displacement of double circular tunnels in layered rock mass lay an essential foundation for back-analyzing the displacement of anisotropic double caverns. Researchers can derive the displacement analytical solution for two circular tunnels in a transverse isotropy rock mass using the complex function and Schwarz alternating methods. This analytic solution can simplify the analytical solution of displacement within an isotropic rock mass and the displacement analytical solution for a single circular tunnel in a transversely isotropy rock mass. The solution demonstrates that even when the tunnel cross-section is presumed to be parallel to the isotropic plane during derivation, the displacement of the surrounding rock is influenced by the elastic modulus and the Poisson ratio in both the isotropic plane and the plane perpendicular to it. Hence, in the displacement back-analysis of two tunnels in transversely isotropic rock mass viewed in cross-section, it is necessary to determine six parameters that meet discernible conditions and use the corresponding sensitivity coefficients to invert the uniqueness of the parameters. By comparing the analytic solution with the numerical solution, it was found that the trends of both solutions were mainly consistent. Moreover, the error between the analytic and numerical solutions was relatively small within the 90 to 105 degrees data, which indicates that the analytical solution can effectively reflect the actual deformation pattern of circular tunnels. This finding is pivotal for back analysis of tunnel excavation displacement in layered rock masses.

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Section: Introductionmentioning

confidence: 99%

Analytical expression of displacement of circular double tunnels in transversely isotropic rock mass in unstable rock zone of southwest mountainous area

Wei,

Zhang

2023

Preprint

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“…It was found the peak strength and peak strain increases along with confining pressure increases. The mechanical properties and statistical damage constitutive model under hydraulic-mechanical coupling rock mass was established by comparing the deformation characteristics and failure modes 2 . Wang studied the effect of interlayer thickness and strength on mechanical behavior and failure processes of layered rock mass with holes through uniaxial compression experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In the process of geological deposition, sedimentary rocks with bedding structure are formed due to gravity. The sedimentary rocks with obvious bedding structure can also be considered as multi-layered rock mass [1][2][3][4] . The layered rock mass can maintain good mechanical properties and strong stability without external disturbance 5,6 , but with the development of underground engineering, the stress state of deep buried layered rock mass will change and cause deformation and failure [7][8][9] .…”

mentioning

confidence: 99%

Frequency response characteristics and failure model of single-layered thin plate rock mass under dynamic loading

Wang

Sun

et al. 2022

Sci Rep

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In underground engineering, disturbance of dynamic load can change layered rock mass stress state and induce accidents. Traditional elastic mechanics can’t effectively solve the complex deformation problem. However, Hamiltonian mechanics system can overcome this problem. Dual variables are introduced in symplectic space to solve the deflection equations of single-layered thin plate rock mass. Comparing vibration parameters, it’s found the 1st, 5th and 6th order are effective vibration modes. The resonance characteristics of thin plate are obtained with three dynamic loads. It’s found the thin plate is most likely to resonate and damage due to the smallest resonance frequency interval and the largest vibration amplitude by impact wave and rectangular wave respectively. Then, the vibration mode of multi-layered rock mass is analyzed through Multiple Reference Impact Testing. The failure of fine sandstone is caused by the resonance of effective vibration modes by hammer excitation. Finally, the failure mechanism of thin plate is obtained by the failure theory and LS-DYNA. It’s found the four sides and corners suffer tensile shear failure and shear failure respectively. When tensile failure occurs in central, the main crack and secondary crack propagate along long axis and short axis to form “O-十” failure mode.

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“…Some scholars fully combine the continuous damage theory, fracture damage theory and statistical strength theory, and consider randomly distributed micro-flaws, assuming that the rock micro-element strength obeys the normal distribution or Weibull distribution, further enriching and improving the development of rock damage constitutive models. Among them, Zhang et al and Chen et al established a macroscopic flaws damage evolution model from the perspective of fracture strain energy [13,14]. Xu and Yang proposed a fractured rock constitutive model that can reflect the initial fracture closure phase in compression.…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanical Properties and Damage Constitutive Model of Multi-Shape Fractured Sandstone under Hydro-Mechanical Coupling

Zhang

Guo

et al. 2022

Minerals

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In this paper, mechanical property tests of sandstone with multiple shapes of prefabricated fractures (single, T-shaped, and Y-shaped fractures) are carried out through the MTS815 rock mechanics testing machine and the Teledyne ISCO D-Series Pumps system. Considering the hydro-mechanical coupling effects, the experiments reveal the key thresholds, strength characteristics and deformation laws of multi-shape fractured sandstones during the progressive failure process. According to the elastic-plastic theory, the continuous damage theory and the statistical damage theory, a new damage model is constructed, which fully reflects the coupled effects among water, micro flaws and macroscopic prefabricated fractures. The crack closure stress σcc, crack initiation stress σci and damage stress σcd of multi-shape fractured sandstone samples are determined by the proposed volumetric strain response method. In the range of 0–90°, the σcc and σci of the multi-shape fractured sandstone samples are different, as well as the angles when the σcd and peak strength (σc) reach their peak values. The stress ratios (the σcc/σc, σci/σc, and σcd/σc are collectively referred to as stress ratios) are hardly affected by the shape and inclination of the fractures inside the rock. According to strength analysis and deformation characteristics, the weakening effect of water has less of an influence on the strength than prefabricated fractures. The stress–strain curve obtained, based on the hydro-mechanical coupling test, is in good agreement with the theoretical curve generated by the damage constitutive model, verifying the rationality of the damage constitutive model. In addition, the fracture inclination only affects the numerical value of the total damage variable of multi-shape fractured sandstone samples, and has minor effects on its variation trend.

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Experimental study on mechanical properties of multi-layered rock mass and statistical damage constitutive model under hydraulic-mechanical coupling

Cited by 11 publications

References 19 publications

Analytical expression of displacement of circular double tunnels in transversely isotropic rock mass in unstable rock zone of southwest mountainous area

Analytical expression of displacement of circular double tunnels in transversely isotropic rock mass in unstable rock zone of southwest mountainous area

Frequency response characteristics and failure model of single-layered thin plate rock mass under dynamic loading

Research on the Mechanical Properties and Damage Constitutive Model of Multi-Shape Fractured Sandstone under Hydro-Mechanical Coupling

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