Crack Extension Process and Failure Behavior of Marbles Containing Fillers

In order to investigate the non-straight fracture failure mechanism further,an automatic engraving equipment was employed to prepare the crack test-pieces taking natural coarse marbles and the marbles containing fillers as the research objects,then an uniaxial compression text was conducted on the "/" type and "S" type crack test-pieces.The results show that 1) The shear failure is observed in both "/" type and "S" type test-pieces in the compression test,moreover,the failure traces are almost the same;2) The failure level of rock mass containing fillers is slighter than those containing no fillers under the same external loading.The early strength as well as the enhancement of the peak residual strength are affected by the fillers,and an 18.75%increase ratio of post-peak strain is achieved in the rock mass containing fillers;3) The crack resistant ability of rock mass varies with different fillers.The cohesive force and strength of cement slurry are much better than the padding gypsum,which indicate that cement slurry has a nice reinforcement efficacy.This study investigated the influences of non-straight crack( "S" type) and filling material on the fractured rock destruction and summarized the crack extension mode with filling materials,which provided the experimental basis and practical reference for the practical engineering fissured rock mass.