Dynamic Response of Seismic Dangerous Rock Based on PFC and Dynamics

Tian, Yun; Wang, Linfeng; Jin, Honghua; Zeng, Biao

doi:10.1155/2020/8846130

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…A DFN is a collection of fractures. DFN is used as a structural plane simulation method that allows the estimation of mesoscopic parameters of the joint plane (Lei and Qing, 2015;Bian et al, 2018;Tian et al, 2020b). Through trial and adjustment, the sandstone and mudstone of the studied slope are calibrated, and the constrained meso parameters are summarized in Table 3.…”

Section: Pfc Meso-parameter Calibrationmentioning

confidence: 99%

Earthquake Dynamic Failure Mechanism of Dangerous Rock Based on Dynamics and PFC3D

Tian

Li³

et al. 2021

Front. Earth Sci.

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The dynamic failure mechanism of horizontally layered dangerous rock during earthquakes is complex and only few studies have addressed the combination of particle flow code (PFC) meso-level failure mechanism and mechanical analysis. Based on fracture mechanics and material mechanics we establish a calculation method for the interlayer load and stability coefficient of horizontal layered dangerous rock during strong earthquakes. The method was applied for calculating the stability of a horizontally layered dangerous slope along a highway in the Sichuan Province (China) during earthquakes as a case study. Using a 3D particle flow simulation technology, a PFC3D model of horizontal layered dangerous rock was established. Its dynamic stability, failure mode and Hilbert-Huang 3D time-frequency characteristics are analyzed, and the results of the simulation are largely consistent with the time of the dangerous rock failure as estimated by our new calculation method. Our study documents that as the seismic acceleration gradually increases, the stability coefficient of the rock block fluctuates more violently and the stability coefficient gradually decreases. The stability coefficient of the rock block decreases fastest between 5 and 6 s and the reduction in the stability coefficient is between 0.12 and 0.25. Before the seismic acceleration reaches the maximum, the dangerous rock blocks on the two main controlling structures collapse and get destroyed. 25 s after the earthquake, the failure mode of the dangerous rock is collapse-slip-rotation. We show that earthquakes with frequencies of 0–10 and 250 Hz have the strongest destructive effect on the stability of the horizontally layered dangerous rocks.

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Section: Pfc Meso-parameter Calibrationmentioning

confidence: 99%

Earthquake Dynamic Failure Mechanism of Dangerous Rock Based on Dynamics and PFC3D

Tian

Li³

et al. 2021

Front. Earth Sci.

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“…Numerical Tool. In the recent studies [11][12][13][14][15], the discrete element method (DEM) has been widely used because it can overcome the continuity hypothesis of traditional continuum mechanics. e DEM was originally introduced by Cundall [16] for the analysis of rock mechanics and then introduced to granular materials by Cundall and Strack [17].…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

Numerical Investigation and Analysis of Intermediate Principal Stress Effects on Rock Failure Behaviors

Deng

Zheng

Yue

et al. 2020

Advances in Civil Engineering

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A series of numerical experiments have been conducted to investigate the intermediate principal stress effects on rock failure behaviors. The numerical results show that the strength and deformation of the rock samples are significantly affected by the intermediate principal stress. The effects are inconsistent in different intervals. As intermediate principal stress ratio b increases, the rock strength increases initially and finally decreases. When b is approximately equal to 0.5, the strength of the rock sample reaches the maximum. In the microlevel, the intermediate principal stress affects the number and distribution of microcracks. The increase of the intermediate principal stress makes the projection of the microcracks on the loading plane change from uniform to uneven. On the one hand, the intermediate principal stress restricts the propagation of microcracks in the normal direction along the intermediate principal stress (or with a component in this direction), which will lead to an increase in the strength of the rock samples. On the other hand, the propagation of microcracks along the normal direction with small principal stress (or with a component in this direction) is promoted, which leads to a decrease in the strength of the rock sample. End friction can make the intermediate principal stress effect more significant because the friction of the loading end to the rock sample can result in stress deviation between the actual value and experimental value. Inhomogeneity of stress field induced by the change of stress states or end friction forces is the external factor of the intermediate principal stress effect. Also, the inhomogeneity of rock material itself is the internal factor. Intermediate principal stress will promote or restrict the failure of certain directions, thus affecting the overall strength of the rock samples. The numerical results can be very meaningful for stability analysis of rock masses in practical engineering.

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An introduction to “Application of Novel High-Tech Methods to Geological Hazard Research”

Xu¹

2023

Natural Hazards Research

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Dynamic Response of Seismic Dangerous Rock Based on PFC and Dynamics

Cited by 5 publications

References 17 publications

Earthquake Dynamic Failure Mechanism of Dangerous Rock Based on Dynamics and PFC3D

Earthquake Dynamic Failure Mechanism of Dangerous Rock Based on Dynamics and PFC3D

Numerical Investigation and Analysis of Intermediate Principal Stress Effects on Rock Failure Behaviors

An introduction to “Application of Novel High-Tech Methods to Geological Hazard Research”

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