Finite Element Modelling: Mechanical Verification of Temporary Works Plant and Load-Bearing Systems for Deep Ground Operations

Client context
A contractor delivering deep ground works using hydraulic struts, walers, and jacking systems as part of a temporary excavation support scheme.

Mechanical challenges

• High axial and bending loads in hydraulic struts under staged excavation

• Load redistribution during installation, pre-loading, and removal

• Risk of local buckling, connection failure, and fatigue under cyclic loading

• Requirement for independent mechanical verification to support temporary works approval

What we did

• Mechanical FEA of struts, walers, pins, cleats, and bolted/welded connections

• Assessment of buckling modes, local stresses, and utilisation margins

• Verification of jack preload forces and load transfer mechanisms

• Independent review aligned with BS EN 1993, BS 5975 interface requirements, and project Temporary Works procedures

Outcome

• Verified mechanical integrity across all temporary load cases

• Removal of unnecessary over-specification while retaining safety margins

• Clear load envelopes and inspection criteria for site teams

• Independent assurance supporting temporary works sign-off and insurer confidence