The Establishment of Segmented Constitutive Relationship of Coal under Triaxial Compression: Take the No. 3 Coal of Xinhe Colliery as an Example

Table 3

Calculation results of fitted parameters.

Number of samples	Confining pressure (MPa)	Segment AB		Segment BC		Segment CD		Segment DE
		a1	b1	a2	b2	a3	b3
XHT1	2	4199.5	4.9014	3047.6	12.341	−3305.3	68.184	23
XHT2	5	5061	6.7573	4601.3	10.313	−8041.8	144.2	32.1
XHT3	8	5811.4	10.044	3711.3	27.055	−6297.9	137.46	49.6
XHT4	11	6038	12.863	3337.7	37.085	−7544.7	166.48	48.1
XHT5	14	6636.5	16.64	3979.6	39.09	−6283	170.14	66.6
XHT6	17	6815.4	19.845	5466.8	32.373	−5806.2	179.6	77.7
XHT7	20	7176.8	22.542	5309.4	40.581	−4835	179.56	93.4