Table of Contents
Chapter 10

— David Wagner 2007/08/07 13:24

Problem 1

To install a shell pile, drive a steel shell into the ground and fill it with concrete.

Problem 2

Cohesionless soil slopes typically fail by material falling from the top to the toe until the slope is at its natural angle of repose. Cohesive soil slopes typically fail by sliding along a slip plane so the entire mass of the slope moves at once.

Problem 3

[pg. 272, eq. 10-2] w={{8*8}/{144}}*4*1500=2667; 2667/40 = 67 lb/ft → k=0.4 [pg.272]

E=15000; S=0.25; wp=2667+2000=4667; wr=5000

R={{2 E}/{S+0.1}}*{{w_r + K_{wp}}/{w_y+w_p}} = {{2*15000}/{0.25+0.1}} * {{5000+0.4*4667}/{5000+4667}} =60886

60886 lb

Problem 4

  1. Slurry grouting: Inject a slurry of water and a suitable grouting material such as portland cement or bentonite into the ground to stabilize soils.
  2. Chemical grouting: Inject a chemical into sands or fine gravel to cement them together.
  3. Compaction grouting: Inject a very stiff mortar into the soil to densify soil and expand it (if necessary).
  4. Jet grouting: Use a rotating jet pipe to remove soil around the grout pipe and repalce it with grout.

Problem 5

Insert a vibrator into a cohesionless soil and use it to densify the subsurface, adding material as needed to make up the volume.

Problem 6

Smaller soil grains hold water more tightly and require more energetic methods of removal, from the use of simple sumps for larger grains to vacuum wells or electroosmosis for smaller effective grain size.

Problem 7

Piles support their loads on their ends (end-bearing piles) and by friction along their sides (friction piles). In practice, almost all piles support some of the load on their ends, and some by friction along their skins.

Problem 8

3/4H:1V (53°)

Problem 9

To protect workers from hole-side failure:

  1. Slope or bench the sides of the hole.
  2. Shore the sides of the hole.
  3. Place a shield between workers and the sides of the hole.

Problem 10

[Programming Problem]

Discussion


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