Question

4. The unit of coeficient permeability of cabe A cm 3 cm D m 5. The average dere o consolidation of a dayayet me c e pressure (p) is in relationship as A. The bigger the p. the higher them a given time B. The smaller the p, the higher the at a given time C. The L'is not influenced by the p. D. The relationship between U and p is uncertain 6. 11. to some reason, the water table is lowered permanently in ground the ground surface will A. Lift up B Settle downs Cunchanges D. Not to be deemed 7. The compressibility of soil is due to ). A. The compression of solid particles B. The reduction of the volume of weid D. The low compression modulus of soil C. The compression of pore water 8. A layer of silt 4m thick lies over a thick layer of saturated clay. The water table is 4m below the ground level. The unit weight of silt is 18 m and that of saturated clay is 195Nm. The calculated effective vertical stress 4m below the ground level ist ) A. 76kPa B. 72kPa C. 32kPa D. 36kPa 9. Under a strip area carrying uniform pressure, the biggest shear stresses would happen ). A. At the edge of the strip area and on loading surface B. At the center of the strip area and on loading surface C. At the center of the strip area and to a depth under surface D. At the edge of the strip area and to a depth under surface 10. If the moisture content of a natural clay is w-27%, the plastie limit and the liquid limit were determined to be w=32 and wp-22. Then, the natural clay is in D. Soft plastie state C. Liquid state B. Hard plastic state A. Solid state

Answer 1

Prob.4 (a) cm/sec

Prob.5 (c)

U is the ratio of the pore water pressure dissipated to the initial pore water pressure, and jt depends upon the drainage condition such as Depth Ratio z/H and Time Factor T.

Prob.6 (B) Settle down

As the water lowers, the effective stress gets increased and thus the pores get compressed, thereby reducing the total volume.

Prob.7 (b)

Solids are almost non compressible, so it the voids which may contain air or water that gets compressed.