Bb. Rajani et al., SIMPLIFIED DESIGN METHODS FOR PIPELINES SUBJECT TO TRANSVERSE AND LONGITUDINAL SOIL MOVEMENTS, Canadian geotechnical journal, 32(2), 1995, pp. 309-323
Pipelines are often subjected to transverse and longitudinal movements
due to displacements in the ground caused by landslides. As landslide
movements develop, pipelines can undergo transverse and longitudinal
displacements and the resistance offered by the surrounding soil stead
ily increases depending on the soil characteristics. This resistance r
eaches an ultimate as the soil reaches failure and develops plastic st
rains. Two simple analytical solutions have been developed based on th
is concept: one for transverse movements and another for longitudinal
movements. Nondimensional relationships have been developed and are pr
esented in the form of charts. These charts permit hand calculations a
nd rapid verification of structural design of the pipeline and, thus,
assess the integrity of existing pipelines located in areas with groun
d instability. A knowledge of the soil strength and subgrade modulus i
s required along with pipeline geometry and pipe stiffness to apply th
e nondimensional relationships. The soil parameters can be measured in
situ or estimated using empirical correlations. Worked examples are g
iven to illustrate the proposed methods and to show how various pipe f
ailure criteria can be included.