Table 1: The core elastic parameters in different directions.

	Core number	Elastic modulus /MPa	Poisson's ratio	Compressive strength /MPa
Along the Z	Z1-1	15280.6	0.27	137.34
	Z1-2	15448.4	0.25	132.53
	Z1-3	15097.8	0.26	128.97
Average	——	15275.6	0.260	132.947
Along the X	X2-1	9017.4	0.30	82.45
	X2-2	8487.8	0.31	84.86
	X2-3	8986.5	0.33	78.39
Average	——	8830.6	0.313	81.900
Along the Y	Y3-1	8743.2	0.34	79.21
	Y3-2	9086.4	0.32	90.32
	Y3-3	8424.3	0.29	86.54
Average	——	8751.3	0.317	85.357