Effect of the Size and Position of a Damping Ditch on the Reduction of the Blasting Vibration

Table 6

PPV of numerical calculation in three directions.

PPV (cm/s)	Measuring point 1#			Measuring point 2#			Measuring point 3#			Measuring point 4#
Numbering	X	Y	Z	X	Y	Z	X	Y	Z	X	Y	Z
0	2.438	4.060	2.344	2.896	3.072	1.380
1-1	1.834	3.485	2.317	1.764	2.134	0.786	2.870	2.718	1.897	11.590	9.274	4.663
1-2	1.949	3.274	1.990	1.539	1.665	0.922	2.624	3.768	1.735	12.127	9.574	4.686
1-3	1.710	2.385	1.739	1.055	1.328	0.835	1.434	1.234	1.138	12.891	10.11	4.763
1-4	1.420	1.595	1.968	0.698	0.788	0.587	0.949	1.494	0.779	11.864	9.786	3.963
2-1	1.949	3.274	1.990	1.539	1.665	0.922	2.624	3.768	1.735	12.127	9.574	4.686
2-2	1.646	3.013	2.511	1.351	1.623	0.938	2.493	3.426	1.416	11.904	9.090	4.712
2-3	2.265	2.547	2.545	1.343	1.727	0.851	2.486	3.320	1.397	12.150	9.566	4.650
2-4	1.855	2.377	2.115	1.273	1.550	0.834	2.288	3.125	1.238	12.042	9.564	4.537
3-1	2.846	3.103	2.435	2.137	2.514	0.969	4.768	4.245	5.083	20.406	13.36	12.216
3-2	3.454	2.622	2.491	1.621	2.058	0.807	2.801	4.066	3.477	11.038	10.88	7.279
3-3	1.949	3.274	1.990	1.539	1.665	0.922	2.624	3.768	1.735	12.127	9.574	4.686
3-4	2.682	1.991	2.055	1.376	1.086	0.718	1.666	3.160	0.921	6.413	6.833	2.709
4-1	3.514	3.348	2.133	2.414	2.746	1.030	4.613	4.539	4.927	17.813	12.10	11.744
4-2	2.227	2.963	2.259	1.408	1.753	0.835	3.026	3.138	3.568	14.284	12.83	9.582
4-3	2.272	2.605	2.173	0.955	1.551	0.846	1.553	1.709	1.608	14.582	10.22	5.122
4-4	2.299	2.292	2.306	0.971	0.934	0.670	1.333	1.611	0.846	13.254	10.46	4.269