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Gabion Wall 

GEO5

Geotechnical software

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Internal stability of gabion wall – factor of safety

The following cases are assumed when examining the internal stability of the gabion wall using the concept of factor of safety:

a) Check for overturning stability:

where: Movr - overturning moment
Mres - resisting moment
FSovr - factor of safety against overturning

b) Check for slip:

where: N - normal force acting on the upper joint of the bottom block
φ - angle of internal friction of the bottom block material
B - width of upper block
c - cohesion of the bottom block material
Q - shear force
FSslip - factor of safety against sliding

c) Check for bearing capacity with respect to the lateral pressure:

where: T - average value of pressure acting on face of the bottom block
S - force per one running meter of the joint
Su - joint bearing capacity (for input use the frame "Material")
FSmesh - factor of safety of stressed mesh (for input use the frame "Settings"  – default value is 1.5)
b - width = 1m
h height of the block
Dcelk overall width of meshes loaded in compression T

d) Check for bearing capacity of joint between blocks:

where: Nd - tensile force per one running meter of the upper joint
Nu - strength of mesh (for input use the frame "Material")
FSmesh - factor of safety of stressed mesh (for input use the frame "Settings" – default value is 1.5)
Qtr - shear force transmitted by friction and cohesion between blocks
kt - coefficient of reduction of friction between blocks (for input use the frame "Settings" – default value is 0,66)
h - height of the block
Dcelk - overall width of meshes loaded in compression T
Dhor - width of upper mesh between blocks loaded in tension

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