An Analytical Solution for Stress and Displacement Field for Arbitrarily Positioned Twin-Tunnel Excavation at Great Depth

Table 6

Circumferential stress on the periphery for/R=6.67 owing to the longitudinal tension of unit force.

θ (°)	0	10	20	30	40	50	60	70	80	90
Green’s	3.019	2.889	2.553	2.024	1.377	0.690	0.047	-0.473	-0.807	-0.915
Proposed	3.004	2.884	2.538	2.010	1.362	0.674	0.029	-0.492	-0.827	-0.934
Error(%)	0.50	0.17	0.59	0.69	1.09	2.32	38.30	4.02	2.48	2.08
θ (°)	100	110	120	130	140	150	160	170	180	-
Green’s	-0.782	-0.426	0.108	0.752	1.428	2.054	2.558	2.884	2.997	-
Proposed	-0.802	-0.447	0.086	0.731	1.406	2.032	2.536	2.861	2.973	-
Error(%)	2.56	4.93	20.37	2.79	1.54	1.07	0.86	0.80	0.80	-