Seismic Earth Pressures on Retaining Structures and Basement Walls In the present state of knowledge, the recommended method of obtaining seismic soil forces is that using equivalent-static analysis. Only for exceptional structures would dynamic analyses using finite elements seem warranted. In the equivalent-static method, a horizontal earthquake force equal to the weight of the soil wedge multiplied by a seismic coefficient is assumed to act at the centre of gravity of the soil mass. This earthquake force is additional to the static forces on the wall. In general, the total soil pressure on a wall during an earthquake equals the sum of three possible components: (1) static pressure due to gravity loads; (2) dynamic pressure due to the earthquake; (3) pressure due to the wall being displaced into the backfill by an external force, e.g. by the horizontal sway of a bridge deck at a monolithic abutment

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Dr hammida

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Seismic Earth Pressures on Retaining Structures and
Basement Walls
ABSTRACT
Observations of the performance of basement walls and retaining
structures in recent earthquakes show that
failures of basement or deep excavation walls in earthquakes are
rare even if the structures were not designed for the
actual magnitude of the earthquake loading. For instance, no
significant damage or failures of retaining structures
occurred in the recent Wenchuan earthquake in China (2008)
and the subduction earthquakes in Chile (2010) and
Japan (2011). To develop a better understanding of the
distribution and magnitude of the seismic earth pressures on
cantilever retaining structures, a series of centrifuge experiments
were performed on model retaining and basement
structures with cohesionless and cohesive backfills.
Seismic soil pressures
In the present state of knowledge, the recommended method of
obtaining seismic soil forces is that using equivalent-static
analysis. Only for exceptional structures would dynamic analyses
using finite elements seem warranted.
In the equivalent-static method, a horizontal earthquake force
equal to the weight of the soil wedge multiplied by a seismic
coefficient is assumed to act at the centre of gravity of the soil
mass. This earthquake force is additional to the static forces on the
wall.

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In general, the total soil pressure on a wall during an earthquake
equals the sum of three possible components:
(1) static pressure due to gravity loads;
(2) dynamic pressure due to the earthquake;
(3) pressure due to the wall being displaced into the backfill by an
external force, e.g. by the horizontal sway of a bridge deck at a
monolithic abutment

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Aleppo University - Faculty of Civil Engineering
A scientific conference in the terms of reference of Civil
Engineering
Resisting the walls of basements and retaining pressure
from the soil of earthquakes
Introduction:
In this research is to clarify how seismic pressures
on retaining walls calculation
And designed to show how the earthquake
resistance in accordance with the requirements of
the Arab code Syrian - Supplement No. 2
As it is explained how to account solving practical
example for the design of retaining wall of
resistance Earthquake for multiple cases of the
existence of water or non-existent.
Seismic Pressure on Basement & retaining walls:
2-1 calculation Pressure from the soil without
earthquakes:
The state of the soil is homogeneous method is
adopted to calculate the Coulomb soil pressure
Retaining walls on the side where it is supposed
that the surface of plane collapse

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Syrian Code
the design loads earthquakes extension
retaining Walls and soil pressure
‫الزالزل‬ ‫تصميم‬ ‫ملحق‬ ‫السوري‬ ‫الكود‬ ‫من‬
Seismic Earth Pressures on Retaining Structures

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Example- 1
calculation Soil pressure from earthquakes
to the wall and the foundation
According to Figure 5

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Example- 2
calculation Soil pressure from earthquakes
to the wall and the foundation
According to Figure 5
Example- 3

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calculation Soil pressure from earthquakes
to the wall and the foundation
According to Figure 5

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Example- 4
calculation Soil pressure from earthquakes
to the wall and the foundation
According to Figure 5

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The water pressure on the walls
In the case of earthquakes

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Example No. 5
The water pressure on the walls
in the restricted case
In earthquakes

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‫طبعة‬2012

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Dr Hammida