Study on the Failure of Quasi Rock Samples Under Different Filling Crack Positions and Sizes
In order to study the effects of different filling crack positions and sizes on the mechanical properties and failure characteristics of quasi rock samples,quasi rock samples with crack widths of 20 mm,40 mm,and 60 mm,and opening degree of 2 mm,4 mm,and 6 mm are prepared and distributed in the middle and edge of the samples,respectively.The uniaxial compressive strength and crack propagation state of the samples are analyzed.The results show that as the crack widths and opening degree increase,the effective bearing capacity of the samples gradually decreases,and the uniaxial compressive strength gradually decreases;the wing shaped cracks that initiate at both ends of the middle cracks are the main cracks that cause samples failure.The edge filled cracks can effectively suppress the initiation of wing shaped cracks,making the uniaxial compressive strength of the edge filled crack samples higher than that of the middle filled crack samples.This study can provide experimental basis for the safety performance evaluation and service life prediction of roadway support structures.
万方数据
维普
