Evaluation of the Adaptability of an EPB TBM to Tunnelling through Highly Variable Composite Strata

Table 17

Location, length, and composition ratio of the composite strata.

Tunnel section	Location	Length (m)	Rock type	Maximum thickness (m)	Rc (%)
C–H	ZCK6 + 600–ZCK6 + 700	31.6	Medium-weathered coarse-grained granite	5.8	83.1
	ZCK8 + 550–ZCK8 + 650	68.4	Medium- to microweathered coarse-grained granite	5.2	74.5
	YCK7 + 680–YCK7 + 750	52.3		4.9	70.2
N-Q	ZCK16 + 550–ZCK16 + 650	89.9	Medium- to microweathered coarse-grained granite	3.2	45.8
	ZCK17 + 850–ZCK17 + 900	16.6		4.6	65.9
	YCK15 + 550–YCK15 + 850	133.6		5.8	83.1
	YCK16 + 100–YCK16 + 250	82.3		6.2	88.8