Study on the Large Deformation Characteristics and Disaster Mechanism of a Thin-Layer Soft-Rock Tunnel

Table 5

Results of the monitoring of the initial support of the tunnel.

Monitoring section	Buried depth (m)	Surrounding rock lithology	Cumulative sinking (mm)	Cumulative convergence value (mm)	Maximum deformation convergence rate (mm/d)
XK0 + 060–XK0 + 250	35–137	Fault fracture zone, strong compression, and torsion of the surrounding rock	120–180	150–430	—
XK0 + 060–XK0 + 250	137–215	Fault fracture zone, strong compression, and torsion of the surrounding rock	230–327	300–580	—
XK0 + 764–XK0 + 865	280–290	Interlayer of the sandy slate and carbonaceous slate	250–427	320–600	—
XK1 + 010–XK1 + 115	309–352	Carbonaceous slate	500–750	650–1550	560
XK1 + 330–XK1 + 380	447–474	Thin-layer carbonaceous slate	240–513	637–1224	174
XK1 + 525–XK1 + 564	568–597	Thin-layer carbonaceous slate	240–565	637–3145	831
XK1 + 564–XK1 + 587	590–597	Thin-layer slate	291–467	657–1205	57
XK1 + 622–XK1 + 666	548–569	Thin-layer slate with stranded water flowing out	140–458	127–2936	814