Pipelines are damaged by permanent ground displacement (PGD) resulting from faulting, land-sliding, or liquefaction. Insulated concrete forms (ICFs), a product constructed of two slabs of rigid polystyrene foam, separated by plastic brackets, can be used in trenches as a compressible inclusion to reduce PGD pipeline damage. The initial rigidity and relative compressibility at large stress levels make ICFs a candidate for protecting underground pipelines undergoing PGD. The imposed pipe distress from PGD is reduced by lowering the resistance to pipe movement. ICFs, when placed in the trench, can perform this function; accommodating the horizontal movement between the pipe and the soil, reducing the imposed stress on the pipe. Full and bench scale tests were been performed to define this interaction, soil-ICF-pipe non-linear springs required for pipeline design were developed. The results for the ICF-soil system shows a significant reduction in pipeline stress for the case where the pipeline undergoes PGD.
An Innovative Use of Expanded Polystyrene Insulated Concrete Forms (ICF) for Geohazards
2013
10 Seiten, Bilder, Quellen
Conference paper
Storage medium
English
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