Internal Stability
Geo-reinforcement force
Determination of forces in geo-reinforcements is performed by splitting and assigning the calculated earth pressure to individual layers. Each reinforcement accommodates part of the active pressure, which acts in the corresponding layer, i.e. force developed in the reinforcement Fx = ΣTa,hor.
Forces transmitted by individual reinforcements
Shape of the slip surface depends on the selected standard of calculation.
Analysis of internal stability varies by type of geo-reinforcements:
- extensible reinforcements (Standard - straight slip surface, AASHTO - Extensible, FHWA NHI-10-024)
- inextensible reinforcements (AASHTO - Inextensible, JTGD30 - 2004 Highway China Code, TB 10025 Railway China Code, BS 8006 - Coherent Gravity Method)
Earth pressure is considered active for extensible reinforcements, or as a combination of pressures for inextensible reinforcements.
The reinforcement is verified for:
Verification of reinforcement can be carried out according to the factor of safety or the theory of limit states.