After High Temperature Fine Sandstone Dynamic Mechanical Properties In Experiment

With the exploitation of underground resources and the use of underground space, geotechnical engineering obtain the unceasing development, the underground space development and utilization of constantly. In geotechnical engineering have been many research results on the mechanical properties of rock under dynamic loads under normal circumstances, and has been used in practical projects. It is a new task to rock mechanics research department to study the stability and destruction of rock under or after the environment of high temperature at present. In rock engineering, development and utilization, the heat of the roadway’s support, in the coal mine rock blasting operation as well as the city circle deep underground space development and utilization in geological environment in rock mass are in certain high temperatures, it cannot ignore rock under high temperature or the mechanical properties of high temperature effect.This paper Hopkinson pressure bar (SHPB) experiment device test the fine-grained sandstone single axis impact loading experiment under normal temperature and high temperature. Studied the fine-grained sandstone dynamic mechanical properties and under normal and high temperature situation. So we obtain the curve of temperature on the fine-grained sandstone dynamic stress-strain relationship. Depend on this conclusion, the paper analyses the fine sandstone peak strength, failure strain and modulus of elasticity change rule, through the contrast analysis of fine sandstone in the different effect of dynamic mechanical characteristics under the conditions. Then compare the different damagement, analysis the damage characteristics under the different condition of fine-grained sandstone and provide some experimental basis for of the geotechnical engineering after high temperature.Hopkinson pressure bar used as experimental device in this paper which is widely used in the study of rock like materials, research the fine-grained sandstone dynamic mechanical characteristics and the damagement after high temperature. Provide more accurate experimental data for the future rock engineering after high temperature. Experimental results in some error, since the author level limitation and the inevitable error in the experiment. In future studies should be perfected.