Study on the Effect of Bond Strength on the Failure Mode of Coarse-Grained Sandstone in Weakly Cemented Stratum

Bond strength is one of the most important parameters and can affect macroscopic mechanical properties damage state rock to some degree. Coarse-grained sandstone was studied using controlled variable method. The influence parallel bond on peak failure mode coarse-grained simulated, evolution law were comprehensively analyzed. results show that positively correlated with strength; difference in quantity between tensile shear cracks negatively strength. With a tensile-shear ratio less than 0.5, usually stable at certain extreme value under constant ratio, ratio. main weakly cemented stratum Hongqinghe coal mine failure. research be used guide ground control other stopes or roadways weak cementation lithology.