Table 2 Mechanical properties of soil layers.

From: Investigation of acoustic waves behavior of an underground tunnel in a multilayer soil

Soil layera

Young modulus (MPa)

Poisson's ratio

Density (g/cm3)

Depth (m)

Layer 1

50

0.4

1.7

0–12

70

0.4

2.89

35

0.3

1.0

Layer 2

85

0.36

1.75

12–25

120

0.4

2.97

60

0.3

1.03

Layer 3

120

0.3

1.80

 > 25

170

0.4

3.05

85

0.3

1.06

  1. aEach layer's first, second, and third rows represent their reference, stiffer, and softer soil properties.
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