Influence of Parallel-Joint Position on Mechanical Behavior and Acoustic Emission Characteristics of Rock Pillar

In this paper, the parallel-joint rock column model is established based on PFC software, and the effects of different joint positions on the mechanical properties, acoustic emission characteristics, and damage evolution characteristics of rock columns are analyzed. In the PFC models, the intact rock is simulated by parallel-bond model, and the joints are simulated by flat-joint contact model. The research result shows that on the whole, when the joint is outside the rock pillar, the UCS of the rock pillar is higher than that of the joint inside the rock pillar, while the elastic modulus is less than that of rock pillar with joint inside. The evolution characteristics of acoustic emission of rock pillars at different joint positions are basically the same. However, the maximum value of acoustic emission events and corresponding deformation of rock pillars at different joint positions are different. The damage of jointed rock mass can generally show three stages: no damage, slow damage increase, and sharp damage increase.

Download Full-text

Simulation analysis on the strength and acoustic emission characteristics of jointed rock mass

Tehnicki vjesnik - Technical Gazette ◽

10.17559/tv-20160826112410 ◽

2016 ◽

Vol 23 (5) ◽

Cited By ~ 6

Keyword(s):

Acoustic Emission ◽

Rock Mass ◽

Simulation Analysis ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Emission Characteristics

Download Full-text

Study on Pressure Relief Effect and Rock Failure Characteristics with Different Borehole Diameters

Shock and Vibration ◽

10.1155/2021/3565344 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Shiwei Liang ◽

Long Zhang ◽

Di Ge ◽

Qiong Wang

Keyword(s):

Acoustic Emission ◽

Research Result ◽

Borehole Diameter ◽

Tunnel Construction ◽

Emission Characteristics ◽

Pressure Relief ◽

Failure Characteristics ◽

Damage And Failure ◽

Acoustic Emission Count ◽

Relief Effect

Rock burst is a common tunnel and mine dynamic disaster, especially for deep buried tunnels, which often leads to tunnel construction delay and even induces tunnel collapse and subsidence of strata. Rock drilling is one of the effective pressure relief methods to prevent these disasters. In order to study the influence of borehole diameter on rock mass pressure relief effect, indoor acoustic emission characteristics and numerical simulation of rock samples with different borehole diameter were studied. The research result shows that with the increase in borehole diameter, the effect of borehole pressure relief is better. Different borehole diameters do not change the overall trend of acoustic emission evolution, but it will lead to different acoustic emission count characteristics of rock damage and failure, especially the maximum acoustic emission count characteristics and corresponding strain values. The existence of drilling will lead to the failure stress of rock in advance. Moreover, the existence of drilling causes a great change in the failure mode of the specimen.

Download Full-text