Question

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2 A 200 kN column load is to be supported on a 3 m square, 1 m deep spread footing underlain by young, normally consolidated sandy soils. The results of a representative CPT sounding at this site are as follow: Depth (m) qe (kg/cm) 0.0-4.0 30 4.0-7.0 51 7.0-12.0 65 12.0-16.0 16.0-20.0 59 110 The groundwater table is at a depth of 10 m; the unit weight of the soil is 16 kg/m² above the groundwater table and 18 kg/m² below. Using Schmertmann's method, compute the total settlement of this footing 10 years after construction.

Answer 1

Solution't As peo Schmertman menod Si Cic₂ net & 12 A2 ils footing net Foundation Pressure 0.5 lc is Correction factor net for depth of do effective over burden Poessure at foundation level C₂ = (ton Coosection factor for Coeep. it is total settlement time 1+ 0.2 logement ينيك a gooss - 200kn Im on56 3 lom 3m x 3m Ysat - 18 kg/m3 مایع رو در و د m Here met X 1200 3x3 passex i 1 22.06 kPa LI This is gross pressure = a156 XI of6 14 Pa This is initial effective overburden bocour 0.156 icla C Ho 5 10.156 22106/ 0.996 1+ 0.2 Logo - thy

Es=2.900 Layer No. Depth A2 qe Es I2 (12 gaz . اية ( العا) 4 2941 5882 10.278 - 1.88X10-9 2 4-7 3 Sool 10002 0.35 Jouston 3 7 -12 5 6374 12748 0:21 8:23x105 4 12-16 5785 11570 4 1 0:27% 9 6x 105 5 16-20 y 10787 21574 0,278 Ji15x105 E 23 8105 C01996)(4:9x (22) (23x10-5) 705x103, 7 mm Si duy Si = for Square footing z depth) Iz Oil 0 2013 6'40.S + VIZ 0.5B-15 ܐܝ ܘ 2 BLA 0.5 3 2 2B 4 4 5+ 2(B) 6m