Some Fundamental Issues and Verification of 3DEC in Modeling Wave Propagation in Jointed Rock Masses

Deng, Xiangtian; Zhu, Jianbo; Chen, Shougen; Zhao, Jun

doi:10.1007/s00603-012-0287-1

Cited by 63 publications

(18 citation statements)

References 22 publications

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“…The dynamic relaxation algorithm is adopted to solve the systems of equations and the development of large displacements is allowed as the failure occurs [33,34]. In this study, the 3DEC discrete element numerical calculation software, which has the features of (1) allow limited displacements and rotations, including complete separation, and (2) automatic identification of new contacts during the calculation, was applied to reveal the anchorage mechanical behaviors of blocky rock mass under an applied axial load [35,36].…”

Section: Experiments Results Analysismentioning

confidence: 99%

Experimental and Numerical Study on Anchorage Strength and Deformation Properties of Blocky Rock Mass

Zhu¹,

Yin²,

Jing³

et al. 2020

Computer Modeling in Engineering &Amp; Sciences

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This study experimentally and numerically investigated the anchorage properties, bolt force evolution, deformation and stress fields of blocky rock mass with various dip angles of joint surfaces under an applied axial load. The results show that due to bolt reinforcement, the axial stress-strain curves of anchorage blocky rock mass show typical strain-hardening characteristics, and compared with models without anchorage, the peak strength and elastic modulus increase by 21.56% and 20.0%, respectively. With an increase in axial stress, the lateral strain continuously increases, and restriction effects of bolts reduce the overall deformation of model surfaces. The axial stressstrain curves of anchorage blocky rock mass in the simulations present a "double peak strength" phenomenon due to bolt reinforcement, and the peak strength, second peak strength, residual strength, surface displacement field, as well as the principal stress fields all depend on the dip angles of joint surfaces. As a result of the bolt reinforcement effects, cone-shaped compression zones are produced in the models, and compression zones of adjacent bolts superimpose with each other to form anchorage belts, improving the overall bearing capacity of anchorage models. Obvious stress concentration can be observed at both bolt end and anchorage section. Not only the role of bolt support transfers the blocky rock mass to be a three-dimensional stress state through compression effects, but also it improves both tensile strength and shear resistance of both joint surfaces and the overall blocky rock mass.

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Section: Experiments Results Analysismentioning

confidence: 99%

Experimental and Numerical Study on Anchorage Strength and Deformation Properties of Blocky Rock Mass

Zhu¹,

Yin²,

Jing³

et al. 2020

Computer Modeling in Engineering &Amp; Sciences

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“…The deformation and damage of geomaterial and tunnel lining are dependent on the location of explosive position inside the tunnel and the radius of curvature of the tunnel [5]. Researchers also investigated the dynamic response of tunnel in weathered rock, propagation of shear wave and behaviour of rock subjected to blast loading [36][37][38]. Moreover, blast analysis of tunnel had been studied mostly using Ansys, LS-DYNA and Abaqus [3-5, 21, 28].…”

Section: Introductionmentioning

confidence: 99%

Effect of unconfined compressive strength of rock on dynamic response of shallow unlined tunnel

2020

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“…In Earth's crust, discontinuities, such as faults, joints, bedding planes, and fractures, are ubiquitous and they often control the hydraulic and mechanical behavior of rock masses [1][2][3][4]. Elastic waves propagating through jointed rock masses will attenuate (or slow down) because of the existence of abundant rock joints [5][6][7][8][9]. e properties of the jointed rock mass including the joint matching coefficient (JMC), joint roughness coefficient (JRC), and the joint stiffness affect not only the dynamic behavior of joint but also the stress wave energy attenuation confirmed by the laboratory experiment (i.e., split Hopkinson pressure bar (SHPB) and ultrasonic test) [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Transmission of Normal P‐Waves across a Single Joint Based on g‐λ Model

Fan

Zhang

et al. 2019

Shock and Vibration

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This paper investigates the wave transmission and reflection of an elastic P-wave at a single joint for normal incidence. First, considering a coupled joint (correction parameter λ, 0<λ<1), a normal deformation constitutive model of the joint (g‐λ model) under static or quasi-static loading is introduced and then extended to dynamic loading. The nonlinearity of the joint stress-deformation curve increases with increasing λ. Second, the interaction between the P-wave and the joint is investigated by using the method of characteristics and the displacement discontinuity method to deduce the differential expression of the transmitted wave’s particle velocity. The approximate analytical expressions of the transmission and reflection coefficients are obtained according to the Lemaitre equivalent strain assumption. Third, parametric studies are conducted to evaluate the effects of λ on transmission characteristics for a normally incident P-wave at a single joint. The results show that the particle velocity of the transmitted wave depends on λ. When λ takes the limit values 0 and 1, the transmitted wave’s particle velocities are then consistent with the conclusions of the classical exponential model and the Barton–Bandis model. In addition, the transmission and reflection coefficients are discussed with respect to λ and also to the ratio of the joint closure to the maximum allowable joint closure.

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Some Fundamental Issues and Verification of 3DEC in Modeling Wave Propagation in Jointed Rock Masses

Cited by 63 publications

References 22 publications

Experimental and Numerical Study on Anchorage Strength and Deformation Properties of Blocky Rock Mass

Experimental and Numerical Study on Anchorage Strength and Deformation Properties of Blocky Rock Mass

Effect of unconfined compressive strength of rock on dynamic response of shallow unlined tunnel

Transmission of Normal P‐Waves across a Single Joint Based on g‐λ Model

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