Influence of Foundation Pit Excavation on Tunnels at Different Locations
Table 1
Soil parameters.
Critical state friction angle(1), φc
30°
Granulates hardness(1), hs
2.6 GPa
Exponent(1), n
0.27
Minimum void ratio at zero pressure(1), ed0
0.61
Critical void ratio at zero pressure(1), ec0
0.98
Maximum void ratio at zero pressure(1), ei0
1.10
Exponent(2), α
0.14
Exponent(2), β
3.0
Parameter controlling the initial shear modulus upon 180° strain path reversal and in the initial loading(2), mR
8
Parameter controlling the initial shear modulus upon 90° strain path reversal(2), mT
4
Size of elastic range(2), R
2 × 10−5
Parameter controlling rate of degradation of stiffness with strain(2), βr
0.1
Parameter controlling rate of degradation of stiffness with strain(2), χ
1.0
Coefficient of at-rest Earth pressure, K0
0.5
Dry density, ρd
1544 kg/m3
Void ratio, e
0.72
Note. The parameter selection is based on the calibration results of the following authors: (1) Herle and Gudehus [32]. (2) Maeda and Miura [33]; Yamashita et al. [34].
