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Analysis of Blast Effects on PCCP Pipelines
This paper presents the results of our analysis of blast effects on prestressed concrete cylinder pipe (PCCP) lines and presents guidelines for arriving at safe peak particle velocity (PPV) of blasts. These guidelines are based on field inspection of the actual condition of the pipe and determination of PPV that will damage the pipe. We present the results of the field inspection of the pipe condition of a particular line near a quarry and the PPV measurements taken near and on the pipe during the repeated blasts. The effect of blasts on the pipe is examined considering three damage limit states: coating delamination, longitudinal cracking, and circumferential cracking. Cracking is a precursor to other damages to the pipe, such as failure of the liner or the wall, buckling of the steel cylinder, or rupture of the pipe. We considered the most severe strains from the three types of seismic waves produced during the blast: P-wave, shear wave, and Rayleigh wave. PPV causing pipe damage in one of the limit states is sensitive to the stiffness or shear wave velocity in the soil and the backfill conditions. Safe levels of PPV at the pipe, and the corresponding blasting charges, are determined for the limit states selected based on the results of analysis of past blasting events and the damages observed on the nearby pipes.
Analysis of Blast Effects on PCCP Pipelines
This paper presents the results of our analysis of blast effects on prestressed concrete cylinder pipe (PCCP) lines and presents guidelines for arriving at safe peak particle velocity (PPV) of blasts. These guidelines are based on field inspection of the actual condition of the pipe and determination of PPV that will damage the pipe. We present the results of the field inspection of the pipe condition of a particular line near a quarry and the PPV measurements taken near and on the pipe during the repeated blasts. The effect of blasts on the pipe is examined considering three damage limit states: coating delamination, longitudinal cracking, and circumferential cracking. Cracking is a precursor to other damages to the pipe, such as failure of the liner or the wall, buckling of the steel cylinder, or rupture of the pipe. We considered the most severe strains from the three types of seismic waves produced during the blast: P-wave, shear wave, and Rayleigh wave. PPV causing pipe damage in one of the limit states is sensitive to the stiffness or shear wave velocity in the soil and the backfill conditions. Safe levels of PPV at the pipe, and the corresponding blasting charges, are determined for the limit states selected based on the results of analysis of past blasting events and the damages observed on the nearby pipes.
Analysis of Blast Effects on PCCP Pipelines
Ojdrovic, R.P. (author) / Rose, B.D. (author) / Zarghamee, M.S. (author)
2003
9 Seiten, 5 Quellen
Conference paper
English
Schichtablösung , Riss , Scherungswelle , Unfallverhütung , Pipeline , Betonrohr , Spannbeton , Sprengung
Analysis of Blast Effects on Prestressed Concrete Cylinder Pipelines (PCCP)
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