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Parametric study of integrity on the mechanical properties of transversely isotropic rock mass using DEM

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Abstract

The evaluation of the mechanical properties of a transversely isotropic rock mass is a challenging task in practical engineering. This paper aims to study the relationships between the integrity parameters and mechanical properties of a transversely isotropic rock mass. The rock mass quality designation (RQD) is an important index and reference for rock mass quality evaluation that was introduced to establish the numerical models of a jointed rock mass with different integrities. The numerical models of a transversely isotropic rock mass were established using the bonded particle model (BPM) and smooth joint model (SJM) embedded into the Particle Flow Code software (PFC2D). After calibrating the microscopic parameters of the intact rock and structural planes, a series of compression tests of a transversely isotropic rock mass was carried out to determine compressive strength and deformation modulus, and main factors were considered including the RQD, inclined angle of structural planes, structural plane thickness, structural plane properties, intact rock properties, and confining pressure. The experimental results showed that the mechanical parameters and failure modes of a transversely isotropic rock mass were controlled by the integrity parameters. By comparing the value of σcm/σc (ratio of the compressive strength of rock mass to rock mass) and Em/Er (ratio of the deformation modulus of rock mass to rock mass) with field test results, the results obtained from the discrete element method were demonstrated to be reasonable.

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Acknowledgments

This study was funded by the National Natural Science Foundation of China (11902249, 11572246, and 51179153) and Scientific Research Program of Shaanxi Provincial Education Department (17JS091 and 2019JQ395).

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Authors and Affiliations

  1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an, 710048, China

    Jiu-yang Huan, Ming-ming He, Zhi-qiang Zhang & Ning Li

  2. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Zhi-qiang Zhang & Ning Li

  3. Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Ning Li

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  1. Jiu-yang Huan
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Correspondence to Ming-ming He.

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Huan, Jy., He, Mm., Zhang, Zq. et al. Parametric study of integrity on the mechanical properties of transversely isotropic rock mass using DEM. Bull Eng Geol Environ 79, 2005–2020 (2020). https://doi.org/10.1007/s10064-019-01679-9

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