Structural failure of a closed protection system can occur in any of the following forms:
• sliding or rolling
• overturning
• bearing capacity failure
• collapse
• internal erosion or piping
Adequate structural design of demountable systems should ensure most of the above failures
do not occur. Some types of failures, such as rolling or collapse, are not always readily
analysed, such systems will require laboratory or field testing to ensure their integrity.
Innovation in this field has also led to the use of materials whose performance characteristics
are less well established. These systems will also require appropriate testing to determine
their structural capabilities. Testing of defence structures is discussed further in Section 7.
Excessive seepage through a defence or its sub-soil could cause internal erosion and lead to a
scenario where the seepage pressure of the water percolating through becomes greater than the
effective weight of the toe on the dry side of the barrier. The result is the generation of a flow
condition within the soil, movement and a risk of foundation failure. This phenomenon is
known as piping.
Piping and bearing capacity failure should be avoided by adequate design for demountable
systems and choice of sub-soil, terrain, foundation and bedding surface conditions for
temporary systems. Resistance to sliding or overturning for a range of loading and foundation
conditions can be considered using standard stability analysis methods.
In the case of temporary systems, the prior investigation or designation of location of use is
not always possible, making it difficult for individual structural analysis to be performed as
soil or bedding information is not available. Testing in these cases may need to be carried out
to confirm suitability for a number of standard soil types.
The risk of structural failure can be minimised by adequate design and testing. The risk of
structural failure for temporary and demountable systems is similar to that for similar
permanent structures and should be done to the same standards to ensure they are no less safe.
Failure of one or more components of a protection system can occur. If this makes the whole
system unable to fulfil its performance objective then a failure of the system is deemed to have
occurred.
Structural failure of a closed protection system can occur in any of the following forms:
• sliding or rolling
• overturning
• bearing capacity failure
• collapse
• internal erosion or piping
Adequate structural design of demountable systems should ensure most of the above failures
do not occur. Some types of failures, such as rolling or collapse, are not always readily
analysed, such systems will require laboratory or field testing to ensure their integrity.
Innovation in this field has also led to the use of materials whose performance characteristics
are less well established. These systems will also require appropriate testing to determine
their structural capabilities. Testing of defence structures is discussed further in Section 7.
Excessive seepage through a defence or its sub-soil could cause internal erosion and lead to a
scenario where the seepage pressure of the water percolating through becomes greater than the
effective weight of the toe on the dry side of the barrier. The result is the generation of a flow
condition within the soil, movement and a risk of foundation failure. This phenomenon is
known as piping.
Piping and bearing capacity failure should be avoided by adequate design for demountable
systems and choice of sub-soil, terrain, foundation and bedding surface conditions for
temporary systems. Resistance to sliding or overturning for a range of loading and foundation
conditions can be considered using standard stability analysis methods.
In the case of temporary systems, the prior investigation or designation of location of use is
not always possible, making it difficult for individual structural analysis to be performed as
soil or bedding information is not available. Testing in these cases may need to be carried out
to confirm suitability for a number of standard soil types.
The risk of structural failure can be minimised by adequate design and testing. The risk of
structural failure for temporary and demountable systems is similar to that for similar
permanent structures and should be done to the same standards to ensure they are no less safe.
Failure of one or more components of a protection system can occur. If this makes the whole
system unable to fulfil its performance objective then a failure of the system is deemed to have
occurred.
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