Study Of Mechanical Properties Research Of The Granite Specimens In The Mud Of Hollow The Dynamic Disturbance

The SHPB dynamic testing system is used as a platform in this paper,it makes the granite as its testing object.Survey the impact test action of different diameter of bore and mud with different moisture content of this granite specimen under impact loading.The paper analyzes the stress-strain curve,destruction process,destruction pattern,absorbing rock energy,the influence of dynamic mechanics of granite.Making the experimental study for mud with different moisture content of granite specimen impacte loading actively only once.Applying with high-speed photography,which means to compare and analyze the experimental atmosphere of granite’s destruction from growing,extension and cut-through of micro-crack.Moreover,it aslo analyzed the energy contrast with energy ratio method when granite was damaged and Combined with the damage pictures.The main researching contents and achievements are as follows:1.Under the same strain rate,with the increase of diameter of bore in testing model,the peak stress will decrease.In the same way,with the increase of moisture content in mud,the peak stress will increase,and then the stress-strain curve post-peak shape will become stronger and stronger as well.2.During the destruction of rock,the connection between mud,diameter of bore and the frame of model’s destruction can be rarely seen.And then the conclusion shows slanting shear crack and longitudinal shear crack that appeared firstly,crosswise crack appeared lastly,together with tensile stress destruction account for the main destruction.3.From the perspective of the Analysis of energy failure criteria,it can be found that with the increase of diameter born,reflecting proportion will get less and transmission proportion will get more.While the granite destruction gets more serious,its energy dissipation will get more and more.The energy-absorbing proportion of unit volume can be adopted to test destructing effect of model.4.By the joint effect of impacting load and water pressure,the growing of granite’s innate crack can influence the destruction of specimen deeply fundamentally and energy’s transmit rule.The crack of tensile shear and compression-shear expansion mode control the destruction process and destroy mode of the granite.