Mechanism and Evolution Control of Wide Coal Pillar Bursts in Multithick Key Strata

Table 6

Increment of hydraulic support stress and energy of high energy MS events during periodic weighting.

Periodic weighting type	The energy of high energy MS events (J)		Change of hydraulic support stress (MPa)
	Maximum	Minimum	Maximum	Minimum
Long	3.0 × 10^7	6.4 × 10^5	7.55	6.50
Medium	2.1 × 10^6	9.8 × 10^5	2.56	0.65
Short	1.3 × 10^6	5.6 × 10^5	3.66	0.39