Research Of The Measure Technique In Testing Dynamic Strength And Dynamic Facture Toughness Of Rock

The research of rock dynamic question is a front-line topic in civil engineering field, up to now, there are many difficulties in testing the dynamic mechanics properties of rock, not in theory but also measure technique. So searching or establishing new methods for testing rock dynamic properties becomes a urgently resolved question in the rock engineering.The paper investigates deeply the loading effect and a variety of dynamic testing technique, suggests the reasonable design-size of the flattened Brazilian disc(FBD) based on the successful experience in static loading. Connecting with strain-gage method, a quick loading test is applied on the FBD on the material testing machine. The experiment obtains the elastic modulus and tensile strength of marble, the results show marble's properties be effected by loading, contracting which in static loading.Most researchers working in rock field proposed that the Hopkinson system be a ideal dynamic-loading equipment and the Brazilian disc be a novel specimen. According to the above, this paper suggests a new method to test the dynamic strength and dynamic fracture toughness, firstly leads the cracked chevron notched Brazilian disc(CCNBD) which was recommended by International Society for Rock Mechanics(ISRM) in 1995 in testing dynamic fracture toughness, which brings in a new way in dynamic testing for rock.It is expected that the work of this dissertation will provide important basis for the further research and application of mechanical behavior of rock.