Experimental Study on Shield Tunneling Control in Full Section Water-Rich Sand Layer of Collapsible Loess

Table 1

Physical and mechanical parameters of the soil layer.

Soil name	Dry density; (g·cm^-3)	Water content; (%)	Compression; modulus; (MPa)	Cohesion; (kPa)	Internal friction angle; (°)	Standard penetration
Plain fill	1.58	20.4	—	22	15	9
Miscellaneous fill	1.75	—	—	5	10	—
Loess-like soil	1.63	20.4	9.4	35	23	19
Medium sand	1.57	16.1	14.6	0	32	64
Gravelly sand	1.96	20.1	15.7	0	33	60
Fine sand	1.65	18.7	15.7	0	31	44
Silty clay	1.61	24.7	5.3	33	18	26
Coarse sand	1.63	17.3	13.8	0	34	—