1) A 30-ft x 30-ft square mat foundation will be constructed at ground surface. The subsoil profile is shown in the figure. The average stress increase due to mat foundation in clay layer is 360 psf. The primary consolidation settlement (in.) of the clay layer directly below the center of the mat is most nearly: a. 0.2 b. 1.0 c. 2.1 d. 3.6 ORIGINAL GROUND SURFACE BLEV DR a. 3.9 b. 3.3 C. 4.8 d. 4.4 ELEV-st ELEV-13 6 4 ELEV-23 301 MIT FOUNDATION Y* 105 pd GROUNDWATER TABLE == SAND yo 115 pdf 4 MI NORMALLY CONSOLIDATED CLAY SATURATED UNIT WEIGHT 95 pel COMPRESSION NOEX-3.29 VOID RATIO 19 318 SAND ww NOT TO SCALE 2) Assume that the primary consolidation in the previous question is 5 in. what is the primary consolidation (in.) taking into account the three-dimensional effect. (A = 0.6).

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Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.