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A platform for research: civil engineering, architecture and urbanism
Laboratory Characterization of Jetting-Induced Disturbance Zones
A laboratory study is performed to develop a model for evaluating the extent of the disturbance zone created by the pile jetting process. The physical phenomenon of jetting was observed in three different sands. Observations indicated that installation of piles by jetting is from the simultaneous erosion of sand beneath the pile tip and transport of soil particles through an annulus created around the circumference of the pile up to the ground surface. The pile advances only after a sufficient area has been eroded beneath the tip to cause a bearing capacity failure, as side friction is reduced due to the return water and liquefaction of sand within the annulus. Given equal jetting parameters, the extent of the debris zone from the pile center was approximately 100% further for sand with smaller average particle sizes (D50 = 0.15 mm) than for sand with larger average particle size (D50 = 0.5 mm). An empirical model to provide dimensional characteristics of the disturbance zone is proposed based on data from the laboratory study. Further research into the effect of jetting and water currents on disturbance zone is warranted including monitoring of field installations to verify the proposed model.
Laboratory Characterization of Jetting-Induced Disturbance Zones
A laboratory study is performed to develop a model for evaluating the extent of the disturbance zone created by the pile jetting process. The physical phenomenon of jetting was observed in three different sands. Observations indicated that installation of piles by jetting is from the simultaneous erosion of sand beneath the pile tip and transport of soil particles through an annulus created around the circumference of the pile up to the ground surface. The pile advances only after a sufficient area has been eroded beneath the tip to cause a bearing capacity failure, as side friction is reduced due to the return water and liquefaction of sand within the annulus. Given equal jetting parameters, the extent of the debris zone from the pile center was approximately 100% further for sand with smaller average particle sizes (D50 = 0.15 mm) than for sand with larger average particle size (D50 = 0.5 mm). An empirical model to provide dimensional characteristics of the disturbance zone is proposed based on data from the laboratory study. Further research into the effect of jetting and water currents on disturbance zone is warranted including monitoring of field installations to verify the proposed model.
Laboratory Characterization of Jetting-Induced Disturbance Zones
Gabr, Mohammed A. (author) / Borden, Roy H. (author) / Smith, Alex W. (author) / Denton, Raymond L. (author)
Geo-Denver 2007 ; 2007 ; Denver, Colorado, United States
Soil Improvement ; 1-10
2007-10-14
Conference paper
Electronic Resource
English
Laboratory Characterization of Jetting-Induced Disturbance Zones
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