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T4 - Tut_Piles sol - CIVL3210 GEOTECHNICAL ENGINEERING...

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CIVL3210 – GEOTECHNICAL ENGINEERING TUTORIAL SOLUTIONS Piles 1. a) Max vale of α occurs when side shear force, Ps, is maximum. kPa Cu Cu As Ps 5 . 1112 2 120 105 ere wh . . = + = = α Maximum value of Ps = 1700 kN Hence, 32 . 0 ) 5 . 112 ).( 15 ).( 1 .( 1700 of max value = = π α b) Pb is given by the bearing capacity formula using Nc = 9 kPa Cu Cu kN Ab p Cu Nc Pb 99 930 4 ) 0 . 15 * 5 . 19 . 9 ( 930 ). . ( = = + = + = π The value of 99 kPa is less than the triaxial test value of 120 kPa. The differences are possibly due to the presence of weaker fissures in the field. (probably none in the triaxial specimen). Disturbance of soil during installation may also have some influence. c) Working load range is in the linear portion of the load v’s deflection curve. Q1 - Pile load test 0 500 1000 1500 2000 2500 0 20 40 60 80 100 Settlement (mm) Load (kN) Pile load End bearing Side friction Also working load is less than (about) ultimate load / 2.5 Choose point at P = 930 kN and settlement = 1 mm © Dr Robert Day, The University of Queensland, 2001
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Settlement is give by I Es L P .
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