Analytical Study on Surface Settlement Troughs Induced by the Sequential Excavation of Adjacent and Parallel Tunnels in Layered Soils

Table 1

Engineering details.

Case NO.	Project name	Ground conditions	(m)	Reference
1	Bangkok MRTA project	Soft clay, hard clay	6.45	Suwansawat and Einstein [12]
2	The new Milan metro line 5	Gravelly sand	6.7	Fargnoli et al. [7]
3	Wuhan Yangtze river tunnel	Miscellaneous fill, silty clay, Mucky soil, silty clay, silt, silty clay, fine sand	12.6	Ma [30]
4	Nanjing metro line 1	Silt, mucky silt clay	6.4	Li [31]