Sandbox Tectonics10

# Sandbox Tectonics10 - [comp positive ] Figure .4 10 Figure...

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12.005 Lecture Notes 10 A house built upon sand… Figure 10.1 Figure by MIT OCW. “Theory” Sand follows Amonton’s Law: τ = µσ n (Mohr – Coulomb) Modify for pore fluid: = p f n Need to express τ and σ n on any arbitrary plane develop stress tensor (symmetric) T = n ˆ ± ± ± or T i = ij n j Mohr circle construction Figure 10.2 Figure by MIT OCW. ˆ n Tn = ±

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Application to accretionary wedge Figure .3 10 Figure by MIT OCW. Assume On verge of failure everywhere µ , λ * b , b Trigonometry relates α , β , , b , … Pore Fluid p f ρ w gD = σ w gD zz Often: ; g (1 ) z cos( ) zz Sandbox tectonics Rheology – “Brittle failure” – friction dominates

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Unformatted text preview: [comp positive ] Figure .4 10 Figure by MIT OCW. Applications: A) Figure 10.5 Figure by MIT OCW. Figure 10.6 Figure by MIT OCW. B) Figure 10.7 Figure by MIT OCW. Figure .8 10 Figure by MIT OCW. Consider stress only only variable for brittle failure neglect strain, velocity, inertia, Possible paradoxes: Type A) int = strong steep repose Type B) strong flat Viscous fluid, type A&B weak falt Complicating factors: Pore pressure; based decollement...
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## This note was uploaded on 10/25/2010 for the course MIT Geodynamic taught by Professor Ywn during the Fall '10 term at MIT.

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Sandbox Tectonics10 - [comp positive ] Figure .4 10 Figure...

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