scholarly journals Dynamic Behavior of Fault Slip Induced by Stress Waves

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Guang-an Zhu ◽  
Lin-ming Dou ◽  
Yang Liu ◽  
Zhen-guo Su ◽  
Hui Li ◽  
...  
Keyword(s):  
Rock Burst ◽  
Dynamic Behavior ◽  
Stress Relief ◽  
Fault Slip ◽  
Stress Waves ◽  
Fault Rock ◽  
Dynamic Disturbance ◽  
Static And Dynamic Analysis ◽  
Disturbance Intensity ◽  
Mining Depth

Fault slip burst is a serious dynamic hazard in coal mining. A static and dynamic analysis for fault slip was performed to assess the risk of rock burst. A numerical model FLAC3D was established to understand the stress state and mechanical responses of fault rock system. The results obtained from the analysis show that the dynamic behavior of fault slip induced by stress waves is significantly affected by mining depth, as well as dynamic disturbance intensity and the distance between the stope and the fault. The isolation effect of the fault is also discussed based on the numerical results with the fault angle appearing to have the strongest influence on peak vertical stress and velocity induced by dynamic disturbance. By taking these risks into account, a stress-relief technology using break-tip blast was used for fault slip burst control. This technique is able to reduce the stress concentration and increase the attenuation of dynamic load by fracturing the structure of coal and rock. The adoption of this stress-relief method leads to an effective reduction of fault slip induced rock burst (FSIRB) occurrence.

scholarly journals Dynamic Behavior of Coal Pillar under Different Load Percentage by Numerical Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Guo-Wei Dong ◽  
Hai-Yang Liu ◽  
Guang-an Zhu
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Goodness Of Fit ◽  
Damage Model ◽  
Coal Pillar ◽  
Peak Stress ◽  
Transmitted Wave ◽  
Softening Function ◽  
Dynamic Disturbance ◽  
Disturbance Intensity

The stability and dynamic response of coal pillar is of great importance in underground coal mining. In this paper, a series of uniaxial compressive experiments were first carried out to investigate the mechanical properties of coal. Subsequently, a statistical constitutive damage model for coal was proposed and applied to the numerical simulation. The proposed strain damage softening function showed almost the same goodness-of-fit on the experimental curve. According to this investigation, a numerical model FLAC3Dwas created to investigate the dynamic behavior of the coal pillar under different load percentage (LP). Modelling suggests that the incident and transmitted wave stress evolution observes similar rule and its process can be divided into three stages, namely, static preload, dynamic disturbance, and stabilized stages. The effects of dynamic disturbance intensity are also studied at 10 MPa, 20 MPa, and 30 MPa of peak stress, respectively. The results indicate that under the same load percentage, the peak incident and transmitted wave stress increase with the increase of dynamic disturbance intensity. On the contrary, the attenuation decreases. It is also observed that the failure zone interior the coal can be predicted by the wave propagation.

scholarly journals Dynamic Behavior of Coal Pillar Under Different Load Percentage by Numerical Simulation

2020 ◽  
Author(s):  
Guo-wei Dong ◽  
Hai-yang Liu ◽  
Guang-an Zhu
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Goodness Of Fit ◽  
Damage Model ◽  
Coal Pillar ◽  
Transmitted Wave ◽  
Softening Function ◽  
Dynamic Disturbance ◽  
Disturbance Intensity ◽  
The Stability

Abstract The stability and dynamic response of coal pillar is of great importance in underground coal mining. In this paper, a series of uniaxial compressiveexperimentswerefirst carried out to investigate the mechanical properties of coal. Subsequently, a statistical constitutive damage model for coal was proposed and applied to the numerical simulation. The proposed strain damage softening function showed almostthe same goodness-of-fit on the experimental curve. A numericalmodel FLAC3Dwas created to investigate the dynamic behavior of the coal pillar under different load percentage(LD). Modelling suggests that the incident and transmitted wave stress evolution observesa similar rule and its process can be divided into three stages, namely, static preload, dynamic disturbance and stabilized stages.Under the same load percentage, the peak incident and transmitted wave stress increase with the increase of dynamic disturbance intensity. On the contrary, the attenuation decrease. It is also observed that the failure zone interior the coal can be predicted by the wave propagation.

On Application of Theory of Distributions to Static and Dynamic Analysis of Cracked Beams

2016 ◽  
Vol 16 (10) ◽  
pp. 1550073 ◽  
Author(s):  
Ricardo Oscar Grossi ◽  
Javier Leandro Raffo
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Numerical Results ◽  
Structural Elements ◽  
Computationally Efficient ◽  
Static And Dynamic Analysis ◽  
Rigorous Framework ◽  
Rigorous Study ◽  
Vibration Problems ◽  
Derivatives Of

This paper presents a rigorous study on the static and dynamic behavior of beams affected by cracks. The theory of distributions developed by Laurent Schwartz is adopted as it is particularly suitable for the treatment of discontinuities in functions for the deflection and derivatives of the beam. Thus, this paper presents a contribution towards the understanding and application of the theory of distributions to the static and dynamic behavior of structural elements affected by cracks. A simple, computationally efficient and accurate algorithm is developed for the problems of concern. Numerical results are presented for beams with two cracks. The algorithms developed for beams with discontinuities are obtained in a rigorous framework for static and vibration problems.

scholarly journals Theoretical Calculation and Analysis on the Composite Rock-Bolt Bearing Structure in Burst-Prone Ground

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Liang Cheng ◽  
Yidong Zhang ◽  
Ming Ji ◽  
Mantang Cui ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Rock Burst ◽  
Mechanical Model ◽  
Surrounding Rock ◽  
Rock Bolt ◽  
Mining Engineering ◽  
Calculation Formula ◽  
Mining Depth ◽  
Rock Parameters ◽  
Bearing Structure

Given the increase in mining depth and intensity, tunnel failure as a result of rock burst has become an important issue in the field of mining engineering in China. Based on the Composite Rock-Bolt Bearing Structure, which is formed due to the interaction of the bolts driven into the surrounding rock, this paper analyzes a rock burst prevention mechanism, establishes a mechanical model in burst-prone ground, deduces the strength calculation formula of the Composite Rock-Bolt Bearing Structure in burst-prone ground, and confirms the rock burst prevention criterion of the Composite Rock-Bolt Bearing Structure. According to the rock burst prevention criterion, the amount of the influence on rock burst prevention ability from the surrounding rock parameters and bolt support parameters is discussed.

Physical simulation of rock burst induced by stress waves

2008 ◽  
Vol 18 (3) ◽  
pp. 401-405 ◽  
Author(s):  
Ai-hong LU ◽  
Xian-biao MAO ◽  
Hai-shun LIU
Keyword(s):  
Rock Burst ◽  
Physical Simulation ◽  
Stress Waves

Dynamic Damage in Certain Monolithic Ceramic Materials

1991 ◽  
Vol 58 (3) ◽  
pp. 639-643 ◽  
Author(s):  
A. E. Giannakopoulos
Keyword(s):  
Dynamic Response ◽  
Dynamic Behavior ◽  
Constitutive Relation ◽  
Ceramic Materials ◽  
Stress Waves ◽  
Material Behavior ◽  
Plastic Behavior ◽  
Longitudinal Stress ◽  
Monolithic Ceramics ◽  
Dynamic Damage

In the present work, the propagation of elasto-damage longitudinal stress waves in thin rods is investigated. The material behavior is characteristic to that of certain monolithic ceramics. The damage constitutive relation that characterizes this type of materials gives rise to certain dynamic behavior which is somewhat different from dynamic plastic behavior. Plastic and damage dynamic response are compared through an example.

Dynamic Behavior of Stress Waves in Blasting Process

2004 ◽  
Vol 465-466 ◽  
pp. 55-60
Author(s):  
S. Matsumoto ◽  
Y. Nakamura ◽  
Shigeru Itoh
Keyword(s):  
Dynamic Behavior ◽  
Stress Waves

Dynamic Analysis of a Historical Fortified Tower

2014 ◽  
Vol 628 ◽  
pp. 178-184 ◽  
Author(s):  
Mariella Diaferio
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Wide Class ◽  
Numerical Models ◽  
Structural Behavior ◽  
Static And Dynamic Analysis ◽  
Preliminary Results ◽  
Masonry Towers ◽  
The North ◽  
Seismic Forces

The present paper is centered on the static and dynamic analysis of the fortified tower of San Felice sul Panaro (Italy) citadel. The examined tower, that dated back to the XIV century, is particularly vulnerable to seismic forces, as the recent Emilia Romagna earthquake (2012) has demonstrated, and can be considered representative of a wide class of masonry towers located in the north of Italy. In order to evaluate the structural behavior, detailed numerical models of the tower with different level of complexity have been defined. In particular, the present paper shows the preliminary results of the static and dynamic analysis performed on such models and the influence of some parameters on the tower dynamic behavior.

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