Reinforcement Effects of Isolation Piles on the Adjacent Existing Tunnel in Building Construction

Table 1

Physical and mechanical parameters of the soil.

Stratum name	Thickness (m)	Compression modulus (MPa)	Poisson’s ratio	Unit weight (kN/m³)	Cohesion (kN/m^2)	Internal friction angle (°)
Miscellaneous fill	2.0	7.0	0.36	18.5	10	15
Clayey silt I	5.2	7.7	0.25	21.6	21	20.7
Silty clay	13.2	9.7	0.26	20.7	28.7	20.6
Clayey silt II	1.8	18.7	0.25	20.7	30	23
Medium sand	3.2	30.0	0.27	21.0	0	30
Pebbles	—	55.0	0.23	22.0	0	35