Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting

Table 1

Comparison of two theoretical values of grouting pressure with field measured values.

Fracture extension length	Field measured value	Equation (17) theoretical value	Equation (20) theoretical value
0.4 m	2.1 MPa	2.48 MPa	5.37 MPa
1.8 m	1.2 MPa	1.39 MPa	5.42 MPa
2.6 m	0.8 MPa	0.86 MPa	5.56 MPa