Seismic Stability Of Tall Retaining Walls With
Traffic Surcharge
Author(s)
C. Onisiphorou
Abstract
Retaining walls are commonly used in engineering practice for the retaining of
soil masses that would otherwise be unstable. However, earthquake induced
forces may trigger an instability or cause failure for a retaining wall. This can
have major consequences for the case of tall retaining walls subjected to heavy
traffic, and is thus the focus of this work. The present paper concentrates on the
investigation of earthquake loading on tall retaining walls supported by an
anchor force. The combined surcharge and ground motion effects resulting from
earthquakes will be examined. A limit equilibrium model approach is used based
on Eurocode 7, and the principles of Eurocode 8 with relevance to retaining
structures are also adopted. A graphical solution is developed for the practicing
engineer for the stability assessment of tall retaining walls under the combined
effect of traffic surcharge and earthquake induced motion. Using simple charts, a
stability factor is determined for the retaining wall.
Keywords: seismic load, retaining walls, earthquake resistance, code design,
Eurocodes, stability, surcharge load, graphical solution.
1 Introduction
The design of earth retaining structures is important for minimizing hazards from
ground failures or slope movement. Retaining structures must also be able to
resist earthquake loading, resulting from strong ground movement in earthquake
prone regions. Eurocode 8: Part 5 [1] addresses this issue by devoting a section
on the earthquake resistant design of retaining structures, while the fundamental
methods for stability considerations of retaining structures are included in EC7:
Part 1 [2]. Both of these documents were adhered to, in the duration of the
present work, as the author aims to follow through the recommended design
procedure.
Keywords
seismic load, retaining walls, earthquake resistance, code design,
Eurocodes, stability, surcharge load, graphical solution.
Related Book
Other papers in this volume
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