Back Analysis of Rock Hydraulic Fracturing by Coupling Numerical Model and Computational Intelligent Technology

Table 1

Comparison of in situ stresses and mechanical parameters between MSVM model and other preexisted models.

Model	(MPa)	(MPa)	Young’s modulus E (GPa)	Poisson’s ratio
MSVM	24.46	14.33	44.02	0.25
ANN-GA	35.83	14.968	39.92	0.26
Eq. (1)	34.549	15.637
Eq. (2)	24.749	15.637

The model proposed by Zhang and Yin [2]. The model proposed by Hubbert and Willis [23].