SOILS,E&F Geology and Engineering CH4

Sedimentary deposits are those that are formed from (select one):

• molten rock (lava or magma)

• water deposits

• fill placed by trucks

The presumptive allowable foundation pressures shown in the building code can never be exceeded even with the use of a geotechnical study of the site:

• true

• false

Higher safety factors are used for rock allowable bearing pressures than for soil because of the uncertain effect of (select one):

• core holes

• acids generated by tree roots

• joints and fractures

• concrete interaction with rock

Rock can be identified by “slaking” when submerged in water:

• true

• false

Igneous rocks are (select one):

• formed when mineral precipitates or shells of marine organisms are deposited in water and are hardened by pressure or cementation over long time periods

• sedimentary rocks transformed from heat and pressure

• formed from molten rock (lava or magma)

Table 1806.2 of the IBC permits allowable foundation pressures of (select one):

• 4,000 psf for crystalline bedrock

• 400 psf for foliated rock

• 4,000 psf for sedimentary rock