doi:10.16186/j.cnki.1673-9787.2020100040

Received:2020/10/20

Revised:2021/01/11

Published:2022/07/15

Experimental study on the propagation and attenuation laws of stress waves in coal under high-pressure gas impact

CHU Huaibao1, REN Zhiqiang1, YAN Song2, ZHU Siyuan1, CHEN Zhen1, YE Hongyu1, YAN Shaoyang1

1.College of Civil Engineering， Henan Polytechnic University， Jiaozuo 454000 ， Henan， China;2.Capital Construction Department， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract: In order to further explore the cracking mechanism of coal under high-pressure gas impact ,the self-developed high-pressure gas impact cracking test system was used to carry out the impact test of coal to test the internal strain of coal, and to analyze the propagation and attenuation laws of internal stress wave of coal. The test results showed that the strain wave generated in coal under the influence of high-pressure gas included two parts ,the compression phase and the expansion phase, but the operating time was longer than the explosion stress wavelength. Under the condition of equal energy , after converting to standard atmospheric pressure , the volume of high-pressure gas was larger than that of TNT blast gas. The impact of the high-pressure gas is mainly quasistatic action process,and there was basically no crushing area in the hole wall,and the energy utilization rate of the impact of the high-pressure gas was high. Under the test conditions ，the attenuation coefficient of stress wave in the coal was about 1.592. The research results provided the test data basis for the application of high-pressure gas impact cracking technology.

Key words:high-pressure gas impact cracking test system;simulation coal;energy analysis;stress wave;propagation law;attenuation law

高压气体冲击作用下煤体内部...力波传播和衰减规律试验研究_褚怀保.pdf