![]() Strain influence factor I z is located on the horizontal axis of the following chart. Modulus factor χ depends on the ratio of footing length l and footing width b: Time in years after the application of load The formula is derived for imperial units - the program calculates automatically in the units used in the program.Ĭorrection factor for footing depth C 1 is determined as follows:Ĭorrection factor for creep settlement C 2 is determined as follows: Strain influence factor at the center of the i th sublayerĪverage value of cone penetration resistance in the i th sublayer The adopted numerical code is briefly described and its validation, via test results on quasi-non displacement piles, is also reported.Settlement of spread footing using CPT tests according to Schmertmann theory is based on the formula: The paper describes the details of experiments undertaken, the adopted procedures and some of the results where not specified, all the experimental data given in this paper referred to model scale. The tests were aimed at investigating the load transfer mechanisms adopted in the design approach, and in particular at validating a numerical code which can be used in engineering practice. The obtained results permitted figuring out the role of piles in terms of their effectiveness as settlement reducers and to quantify the load sharing mechanism between piles and the raft-soil contact. Beneath the rafts, two types of model piles, close-ended and free headed were installed: quasi displacement (QD) and quasi-non displacement (QND) piles. In each test, some model piles were instrumented with load cells to determine the distribution of load along the shaft. The testing program included: an unpiled raft, rafts on 1, 3, 7 and 13 piles. The tests were aimed at investigating the behavior of rafts on settlement reducing piles. ![]() ![]() The paper presents the results of extensive centrifuge tests modeling rigid circular piled rafts laying on a bed of loose very fine silica sand. ![]()
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February 2023
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