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

Table 2

Circumferential stress owing to the longitudinal tension of unit force.

Distance		2	3	4	6	10	16
	Ling’s	3.869	3.151	3.066	3.020	3.004	3.001
	Proposed	3.564	3.094	3.035	3.007	3.000	2.999
	Error(%)	7.88	1.81	1.01	0.43	0.13	0.07
	Ling’s		3.264	3.020	2.992	2.997	2.999
	Proposed	16.775	2.998	2.923	2.965	2.990	2.997
	Error(%)	–	8.15	3.21	0.90	0.23	0.07