A Nonlinear Constitutive Model for Disintegrated Carbonaceous Mudstone Based on Logarithmic Functions

Table 2

Nonlinear constitutive model parameters based on logarithmic functions.

Degree of compaction (%)	K	n	c	φ	Rf	X	J	G	F	a'
90	274.92	0.2206	6.91	17.22	0.9299	−11.69	2756.3	0.3495	0.1293	0.1358
93	327.57	0.2006	9.59	20.79	0.9273	−9.80	2371.4	0.2816	0.2388	0.1564
96	340.72	0.3772	14.79	23.11	0.9206	−4.13	1434.9	0.2670	0.1982	0.1705