True-triaxial study on the rockburst characteristics of rock mass with a hidden structural plane
LI Qun
HU Zihao
LI Shibo
LIANG Peng
HAN Qiang
YANG Sihao
LIU Ziqiong
Abstract：Rockburst of rock mass containing structural plane is one of the important disasters that damage personnel and property safety.The true triaxial single-side aerial loading rock-burst test were conducted,combined acoustic emission monitoring and three-dimensional scan-ning technology.The effects of parameters for hidden structural plane on rock strength,rock-burst characteristics and failure forms of granite are studied.The relationship between the shear strength of structural plane and the volume of rockburst pit is analyzed.The results show that the compressive strength of rocks with different structural planes is reduced.For 30°—60°of the structural plane,the ability of structural planes to weaken rock strength increa-ses first and then decreases.With the change of structural plane angle,the location of rock-burst and the degree of rock damage change accordingly.The increase of the length of struc-tural plane,with the peak stress of rock decreases.Localized shear failure or splitting failure in rock is induced by shorter structural planes,global shear failure or slip failure in rock is trig-gered by longer structural planes.The compressive strength of rock is enhanced by approxi-mately 11.6％due to structural plane grouting,the deformation and displacement of rock blocks at structural planes under shear loading are reduced by structural plane grouting;The proportion of rock yield stage time increases by 1％-14％when the rock contains structural planes.Grouting is demonstrated to extend the instability stage duration.An inverse correla-tion is identified between the shear strength of hidden structural planes and rockburst intensi-ty.The higher shear strength of structural plane is,the smaller rockburst pit volume becomes and the reduced the rockburst intensity occurs.Rockburst mechanisms in rock with hidden structural planes are classified into shear-slip type and tensile-shear composite type.These findings provide theoretical support for disaster prevention and mitigation in underground engi-neering involving hidden structural planes under high-stress conditions.
Keywords：rockbursthidden penetrating structural surfacesgroutingrockburst pit
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 623-639 )