Analysis of the Compressibility Effect of Overburden in a Deep Shield Tunnel Based on the Effect of the Pressure Arch

Table 2

Theoretical calculation results at different working conditions.

Thickness/diameter	Depth of overburden (m)	Height of loosen zone (m)	Vertical relaxation soil pressure (Pa)	Radius of plastic zone (m)
2.5	15	9.7	181073	15
3	18	10.7	200868	15
3.5	21	11.6	217247	15
4	24	12.3	230798	15.3
5	30	13.4	251287	16.4
6	36	14.2	265314	17.2
7	42	14.7	274916	17.7
8	48	15.1	281490	18.1
9	54	15.3	285990	18.3
10	60	15.4	289071	18.4