Stability Analysis of Neighborhood Tunnels with Large Section Constructed in Steeply Jointed Rock Mass

Table 4

Equivalent elastic modulus (GPa) and unity weight (kN/m³).

Spacing	Thickness
	25 cm	30 cm	33 cm	35 cm	40 cm
40 cm	33.8/25.9	32.0/25.4	31.2/25.2	30.7/25.1	29 .7/24.8
50 cm	31.6/25.3	30.2/24.9	29.5/24.8	29.2/24.7	28.4/24.5
60 cm	30.2/24.9	29.0/24.6	28.4/24.5	28.1/24.4	27.5/24.2
70 cm	29.2/24.7	28.1/24.4	27.7/24.3	27.4/24.2	26.8/24.0
80 cm	28.4/24.5	27.5/24.2	27.1/24.1	26.8/24.0	26.4/23.9