4. In a plane wave front, the pressures in the plane of the wave front are v/(1-v) times the pressure normal to the wave front. What is the least value of Poisson's ratio (v) such that compressive or shear failure does not occur as the wave front sweeps through the rock? (See Problem 3.)

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A: Solution: Given: Column Span = 3.3 m fck = 30.5 MPa fy = 472 MPa DL = 3.55 kPa LL = 4.55 kPa

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Sediment transport

Sediment transport or Soil transport is the movement of solid particles, usually due to the combination of gravitational forces acting on the sediment, and the movement of the liquid at which the sediment enters. Soil erosion occurs in natural systems where the particles are sandstones (sand, rocks), mud, or clay; the liquid is air, water, or ice; and the gravitational force that works to move particles to the landing surface. Sediment transportation or soil migration due to the movement of liquids occurs in rivers, lakes, lakes, oceans, and other bodies of water as a result of currents and waves. Transportation is also caused by glaciers as they flow, and to places on earth under the influence of wind. Soil erosion due to gravity alone is possible in most sloping areas, including hills, scarves, cliffs, and the continental shelf — the continental boundary of the slope.