Experimental study on the attenuation characteristics of explosion stress waves under φ40 mm apertures
In order to study the propagation and attenuation laws of explosive stress waves in bedrock,different levels of surrounding rock were simulated by different grades of concrete,and blasting tests were conducted on different charging structures with typical borehole diameter.PVDF thin film sensors were made and embedded to measure the peak Value of explosive stress at different distances under six different charging structures,in order to explore the influence of different charge quantities and rock properties on the propagation of explosion stress waves.The exponential relationship of explosive stress wave attenuation with propagation distance of C20,C30,C40 concrete specimens in the range of the test were obtained through the test.The test results preliminarily show that the attenuation coefficient of the explosive stress wave in the medium will increase with the increase of the wave impedance of the medium.At the same time,it also verifies that the method of using PVDF sensors to measure the peak value of the explosive stress in the concrete is feasible,and the test data are reliable,which has guiding significance for the subsequent research of the stress attenuation law under different geotechnical media and engineering application.
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