Study on Occurrence Mechanism of Coal Pillar in L-Shaped Zone during Fully Mechanized Mining Period and Prevention Technology

Table 2

Testing result of #1 coal samples impact tendency.

Coal sample	Indexes				Impact tendency
No. 3	DT		KE	Rc	Strong impact tendency (III)
	29.4	4.259	10.428	27.118
	Strong	Weak	Strong	Strong