| With the development of national economy, underground engineering and protective engineering, mineral engineering and many other fields have been developed more and m ore widely. Study on the mechanical properties and the crack propagation of rock has a great influence on the safety and reliability. Rock is of strong heterogeneity and brittle. Under dynamic loading, the energy will release and lead stress redistribution in the rock, which contributes deterioration of the rock mechanical properties when the loading rea ches the ultimate strength. The rock material is often subjected to dynamic loading under construction so that research on the dynamic characteristics and crack propagation char acteristics of rock materials is particularly important.The methods of rock materials mainly include experimental method, analytical meth od and numerical simulation. Numerical simulation is a supplement to experiments and th eoretical analysis. The increasing computing capability of computers and the relatively low cost of numerical simulation make it applied in engineering.This paper uses the RFPA2D-Dynamics to study the dynamic mechanical properties of rock under dynamic loading, and accomplishes following contents:1 Read the relevant literature and summarize the current domestic and foreign study on rock materials under dynamic loading.2 The influences of load waveform, coefficient of homogeneous m, width of mod el and element size on rock mechanical properties were studied using Rock Failure Pr ocess Analysis(RFPA-dynamics) through simulation of rock separation under impact.3 The influences of soft and hard granules and biaxial load on rock crack propag ation mode were studied using Rock Failure Process Analysis(RFPA-dynamics) through simulation of rock crack propagation.4 The influences of ratio of elastic modulus and biaxial dynamic loading on rock mechanical properties were studied using Rock Failure Process Analysis(RFPA-dynami cs) through simulation of crack bending. |
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