Table 1: Properties of the materials in each section or span.

Section 1
siltstone
Section 2
siltstone
Section 3
siltstone
Section 4
siltstone
Section 5
siltstone
Section 6
siltstone

Length of span (m)1.251.251.251.251.251.25
Thickness (m)1.51.51.51.51.51.5
Young’s modulus (MPa)355035503550355035503550
Load (kN/m)172001720017200172001720017200
Supporting stiffness (MPa/m)47.847.847.847.847.847.8
Tensile strength (MPa)4.244.244.244.244.244.24
Prop number123
Prop stiffness (MPa/m)150015001500
Spacing of props (m)0.550.550.55