Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large-Section Mining Tunnel

Table 4

Results of the direct shear test.

Vertical stress (kPa)	Shear stress (kPa)	Displacement (0.01 mm)	Fitting equation	Internal friction angle (°)	Cohesion (kPa)
100	53.3216	30.4	y = 0.4507x + 5.3372	24.26	5.3372
150	72.2648	41.2
200	90.6818	51.7
300	143.1264	81.6