Effect of Group Fissures Parameters on Mechanical Properties of Rock Specimens Under Biaxial Loading Conditions
The distribution of the surrounding rock fissure is complex in the deep stratum rock roadway of coal mine,and the fissure parameters have a significant impact on the mechanical properties of rock mass.In order to study the failure law and mechanical properties of fractured rock masses in deep strata under excavation disturbance conditions,a group of specimens containing pre-existing joints with different dip angles and lengths were prepared.A biaxial loading test was conducted to simu-late the excavation disturbance of deep coal mine tunnels,and the mechanical characteristics and influen-cing factors of rock specimens were studied.The results show that the strength of the samples with group fissures is obviously affected by the dip angle of the pre-existing joint.When the dip angle of the pre-existing joint is 30°～45°,the crack initiation stress and peak stress of the specimens are the mini-mum,and when the dip angle is 90°,the crack initiation stress and peak stress of the specimens are the maximum.Under the condition of biaxial fixed proportion loading,the dip angle and length of the pre-existing joints have an impact on the strength of the specimen.Among them,the dip angle of the pre-existing joints has the most significant effect on the strength of the specimen,while the length has little effect.
group fissuresbiaxial loadingrock-like specimensmechanical propertiesrupture mode
万方数据
维普
