Complex Analytical Study of the Stability of Tunnel-Surrounding Rock in a Layered Jointed Rock Mass

Table 2

Error analysis of the sampling points.

Tunnel	Objective function value (m^2)	Average absolute error (m)	Maximum absolute error (m)	Average relative error (%)	Maximum relative error (%)	Total length of real tunnel boundary (m)	Mapping accuracy (%)	Mapping accuracy (%)
a	0.00662	0.0151	0.0459	0.39	1.11	26.1724	0.06	44.12
b	0.01085	0.0200	0.0501	0.48	1.15	29.1912	0.07	42.96
c	0.01526	0.0222	0.0685	0.44	1.17	32.8441	0.07	45.94
d	0.01391	0.0220	0.0637	0.44	1.11	32.9070	0.07	44.12
e	0.01490	0.0243	0.0589	0.38	0.82	42.0192	0.06	41.22