Study of Simulation Test in Inclusion Rockburst

Abstract

Based on the existing classification research of rockburst dynamic disasters, a new rockburst model is introduced. The model specimenswithinclusionrockaredesignedandproduced,andtheindoortestofinclusionrockburstwithorwithoutcementation, different inclusion angles, and prefabricated cracks of different lengths is carried out. The failure process and displacement variation of rockspecimens are recorded and measured bythe high-speed camera systemand digital image correlation method, andbasedonthis,thecharacteristicsandlawsofrockburstareanalyzed.Theresultsshowthatthefailureprocessofinclusionrock can be divided into several periods, such as crushing and extrusion of the cement body, and the cracks in the upper left tip, the lowerrighttip,thelowerlefttip,andtheuppertipareexpandedandbrokenindifferentorders.Thedynamicejectionfailureofthe rock fragments occurs when the degree of failure is severe, and the static failure occurs when the degree of failure is weak. The inclusionshavecementation,andthebetterthecementation,thegreaterthestressloadingrequiredinthefailure,thegreaterthe energyaccumulated,themoreseverethefailure,andthehigherthefractaldimensionofthefragments.Thelargertheangleofthe inclusion tip, the greater the stress loading in failure; the greater the change of the u and v displacements, the more the displacementoftheinclusionschanged;andthemoretheenergyaccumulated,thehigherthefractaldimensionofthefragment.The smaller the crack length, the greater the stress loading in failure, and the more the energy accumulated, the higher the fractal dimension of the fragments in failure. With more number of cracks and the more severe expansion before failure, the failure of rock mass can be transformed from the dynamic to the static.