Attenuation Characteristics of Stress Wave Peak in Sandstone Subjected to Different Axial Stresses

Table 1

Peak and its corresponding time under different axial stresses.

Axial stress (MPa)	Peak (mV)/corresponding time (μs)					Impact velocity (m/s)
	Test point A	Test point B	Test point C	Test point D	Test point E
0.00	0.1863/142	0.1620/227	0.1377/311	0.1230/398	0.1033/494	4.45
2.76	0.1543/155	0.1403/218	0.1200/299	0.1073/372	0.0900/452	4.44
5.52	0.1247/152	0.1173/214	0.1037/289	0.0943/356	0.0830/429	4.47
8.28	0.0967/148	0.0940/210	0.0823/276	0.0787/341	0.0717/413	4.46
11.04	0.0807/141	0.0790/212	0.0710/266	0.0680/334	0.0643/398	4.35
13.80	0.0727/142	0.0693/202	0.0633/266	0.0617/323	0.0593/393	4.38
16.56	0.0660/142	0.0613/209	0.0573/261	0.0553/330	0.0527/378	4.39
19.32	0.0653/142	0.0577/201	0.0553/257	0.0547/327	0.0523/378	4.41
22.08	0.0630/137	0.0570/199	0.0567/259	0.0543/314	0.0497/374	4.36
24.84	0.0617/140	0.0540/202	0.0547/263	0.0530/322	0.0463/372	4.45
27.60	0.0597/149	0.0553/192	0.0520/252	0.0510/316	0.0480/379	4.49
30.36	0.0593/149	0.0550/204	0.0520/261	0.0480/318	0.0460/382	4.43
33.12	0.0587/131	0.0537/197	0.0493/250	0.0490/319	0.0437/380	4.47