Axial Force Coherence Study of Servo Steel Strut Loading in Soft-Soil Deep Excavation
Publication: International Journal of Geomechanics
Volume 24, Issue 8
Abstract
The coherence of axial force between steel struts in excavation (axial force coherence) is an important factor affecting the axial force control of servo struts. To understand the law of axial force loss of adjacent struts caused by servo struts loading, this paper proposes a calculation method based on the theory of nonlimiting earth pressure. First, the diaphragm wall is simplified to a simply supported beam with both endpoints free horizontally, the soil on both sides of the diaphragm wall is divided into small sections ( as big as possible) along the depth direction, and the average nonlimiting earth pressure combined force within each section is calculated. Second, a system of nonlinear force-displacement equations is constructed by applying the “graph multiplication” method to calculate the combined nonlimiting soil pressure and deflection of the wall from the axial force of the servo steel strut at each level. The Newton–Raphson method is applied to obtain a recursive equation for the wall displacements. The accuracy of the method is verified by comparison with field measurements. Then, based on the method in this paper, the effect of prestressing and adjustment on the axial variation of each strut course is investigated. The method can provide a reference for the loading scheme of servo steel struts in deep excavation in soft-soil areas.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 24 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 19, 2023
Accepted: Jan 31, 2024
Published online: May 29, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 29, 2024
ASCE Technical Topics:
- Axial forces
- Axial loads
- Construction engineering
- Construction methods
- Continuum mechanics
- Displacement (mechanics)
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Excavation
- Forces (type)
- Geomechanics
- Geotechnical engineering
- Materials engineering
- Metals (material)
- Soil dynamics
- Soil mechanics
- Soil pressure
- Solid mechanics
- Static loads
- Statics (mechanics)
- Steel
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Struts
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