Multi-stress gradient speed-adjustable drop hammer impact testing method

Abstract

The invention discloses a multi-stress gradient speed-adjustable drop hammer impact testing method, and relates to the field of dynamic impact tests, and the method specifically comprises the four steps of experiment machine mounting, experiment machine debugging, testing block fixing and impact tests, a limiting hole in an impact hammer is sleeved with a supporting column, a position control clamping rod penetrates through a support top plate to connect the impact hammer and a position control gear, and a test machine is connected with a controller; the testing machine is connected with the controller; the controller is used for controlling the testing machine to stretch up and down to calibrate errors; a sliding bottom plate is limited through fixing pins; according to design testing requirements, the position control gear is started to rotate, the impact hammer simultaneously reaches the surface of a testing block, and different stress gradients are realized at different positions. The method has the characteristics that the operation is simple, the result is reliable, the cost is low, and the dynamic load disturbance testing result of the coal-rock mass under the multi-stress and impact rate gradient is obtained.

Description

technical field [0001] The invention relates to the field of dynamic impact tests, in particular to a multi-stress gradient adjustable speed drop hammer impact test method. Background technique [0002] In reality, engineering coal and rock masses are often subjected to dynamic loads, and the study of dynamic load characteristics of coal and rocks is of great significance. At present, SHPB and drop-weight impact testing machines are mostly used for the research on the dynamic characteristics of coal and rock mass, among which the simple structure of the drop-weight impact testing machine has been widely used. However, when the engineering coal and rock mass is disturbed by dynamic load, different positions of the same coal and rock mass are often subjected to different impact loads and impact rates, and most drop weight impact tests fail to provide test methods for simultaneous loading of multiple stresses and multiple impact rate gradients , failed to reflect the real forc...

AI Technical Summary

Problems solved by technology

However, when the engineering coal and rock mass is disturbed by dynamic load, different positions of the same coal and rock mass are often subjected to different impact loads and impact rates, and most drop weight impact tests fail to provide test methods for simultaneous loading of multiple stresses and multiple impact rate gradients , failed to reflect the real stress situation, and the obtained dynamic experiment results were different from their real characteristics.

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