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

Table 4

Absolute value of relative error of lateral strain (%).

Degree of compaction	Confining pressure
	50 kPa	100 kPa	150 kPa
90%	28.04	17.35	27.79
93%	18.81	16.96	10.43
96%	11.47	21.78	9.19
Average value	17.98