Archive image from page 75 of Deep ocean cable burial concept. Deep ocean cable burial concept development deepoceancablebu00rock Year: 1976 Appendix C POWER ANALYSIS OF AUGER TRENCHING To estimate the power required to auger a trench in the seafloor consider a single vertical auger with the following characteristics Outside diameter, D = 4 in. o Inside diameter, D. = 2 in. Length, I = 36 in. Pitch, p = in. hoH Figure C-1. Auger configuration. With a 3 'slug' ,6-inch pitch, 10 revolutions of the auger are required for a of soil cut from the bottom of the trench to reach the top. Assump
Archive image from page 75 of Deep ocean cable burial concept. Deep ocean cable burial concept development deepoceancablebu00rock Year: 1976 Appendix C POWER ANALYSIS OF AUGER TRENCHING To estimate the power required to auger a trench in the seafloor consider a single vertical auger with the following characteristics Outside diameter, D = 4 in. o Inside diameter, D. = 2 in. Length, I = 36 in. Pitch, p = in. hoH Figure C-1. Auger configuration. With a 3 'slug' ,6-inch pitch, 10 revolutions of the auger are required for a of soil cut from the bottom of the trench to reach the top. Assumptions: Half of the auger cuts new material The same forces apply as for trenching (bearing resistance and friction) A where S N u TOT = S A. N + f c = undrained shear strength = 4 lb/in = frontal area of the auger blade = dimensionless constant ( 3) = side area of the auger = in. 1 - 2 — TT D a = lib in. Then 68
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