Soil liquefaction

Soil liquefaction

1. Has always occurred, but it was until 1960s that engineers started to understand the mechanics of it

2. Saturated loose land

   • Application of a shear force will provoque the soul particles to shift and then to reconfigure themselves.

3. Drained conditions

   • The pore of water can escape, causing the consolidation of the soild and the reatin of its strenght

4. Undrained conditions

   • The pore water cant not escape, particles hydroplane and have little to no shear stregth

5. Types

   • Flow liquefaction
     • Soild cannot stand under its own weight
   • Cyclic mobility
     • Soil liquefies and moves in lurches
   • Critical aspects
     • 1) liquefaction susceptibility
       • Compositional criteria
         • Poorly-graded, cohesionless, gravel to coarse silts.
       • State criteria
         • Consideration of effective confining stress and density
     • 2) Initiation
       • The flow liquefaction surface is the envelope in p'-q space where rapid loss of shear strength is triggered, often resulting.

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