Question

Task3 A ten-story building is to be constructed at a site where the water table is at the ground surface. The foundation of the building will be supported on 30 cm diameter pipe piles. The soil investigation at the site and laboratory tests have provided the saturated unit weights, the shear strength values under undrained conditions (average), the corrected SPT values, and the soil profile of the soil to a depth of about 40 m. The soil profile and the other details are given below. CE 579 FOUNDATION ENGINEERING Spring Semester c (average) kN/m2 Depth (m) From 0 6.0 Soil set cor To 18 33° 19 22 Med. stiff clay 18 19.6 18.5 Sand 60 25 35° 30 40 sand 75 30 stiff clay (i) Determine the ultimate bearing capacity of a single pile for lengths of (a) 15m, and (b) 25 m below the bottom of the cap. Use the Briaud et al. (1985) for tip resistance in sand and method presented in the class notes for tip resistance in clay. Use the α method or the β method, as appropriate, for the skin friction. (i) Re-calculate the ultimate bearing capacity of the 25 m-long pile using the Coyle and Castello method for tip resistance in sand and method presented in the class notes for tip resistance in clay

Answer 1

Lven Dile 0m kemptonsmcthod x 150 2. (69. 646 KN

method = o.cu ニ6.875 2 11,-150 Kulm 0-38 ょ乂スCu3 0-38 X15o

12. 82 30 KN 2 36 99 I KN

179.0子 +329. 86千t 3チ699 1 885.928 KN acu .928 Q -ID 55.574 KN Fibs 105 5.574 5 422.23 KN