Table 5 Comparison of physical and mechanical properties between the Tamusu Mudstone and foreign clay rocks

Continuous thickness (m)

130

131

100

 > 400

Water content (%)

2.8–8.7/6.7

5–8.9/6.6

28

0.74–9.97/5.45

Porosity (%)

9–18/14

14–25/17

54 (< 2 μm)

13–25

Permeability coefficient (m/s)

10^–14–10^–12

10^–14-10^–12

2*10^–12–4*10^–12

10^–14–10^–12

Bulk density (g/cm³)

2.4 ± 0.02

2.4–2.53

2.67

1.94–2.34

Particle density (g/cm³)

2.7 ± 0.01

2.74–2.79

–

2.61–2.69

Uniaxial compression (Mpa)

12–49

23.1–28.1

2.0–2.2

36–94

Elastic modulus (GPa)

2.3–11

2.1–3.5

–

3.11–12.28

Tensile strength (Mpa)

0.9–5.4

1–2

–

4–16

Poisson's ratio

0.17–0.4/0.3

0.28–0.38

0.4

0.14–0.48

Thermal conductivity

(W*m⁻¹ K⁻¹)

1.47

1–3.1

Horizontal:2.33

Vertical:1.77

1.12–1.64