SENSIBILITY OF SILTY SOILS SHEAR STRENGTH PARAMETERS ON THE SIZE OF SPREAD FOUNDATION
Journal Title: Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo. - Year 2015, Vol 0, Issue
Abstract
The paper deals with sensibility of silty soils shear strength parameters on the size of spread foundation. Minimal, intermediate and maximal values of shear strength parameters of 4 classes of silty soils (MG; MS; MI and ML; MH, MV and ME) in frame of soft and firm consistence as so as maximal values in semi-solid consistence introduced in the old Slovak Technical Standard STN 731001 (in the following abbreviated as “the old STN”) had been used to design model spread foundation, similar with the one posted by Orr (2005). The foundation has square shape, thickness 0.8 m, founded in the depth D = 1.5 m. The foundation is loaded by centrically acting vertical permanent load G = 900 kN and variable load Q = 600 kN. Underground water level is at foundation base. The spread foundation was designed by design approaches mentioned in Eurocode 7, Part 1 (DA1-C1; DA1-C2; DA2 and DA3) and also by the old STN and new Slovak Technical Standard (in the following abbreviated as “the new STN”). It will be shown that for all values of silty soils shear strength parameters the size of foundation is the smallest when designed by the DA1-C1. The size of foundation is the biggest when designed by the DA3 (for soil MG) or by the old STN (for soil ML and MI; MH, MV and ME). Concerning the old and new STN, for all values of silty soils shear strength parameters, the size of foundation designed by the new STN is smaller in comparison with the one design by the old STN. It will be also shown that small difference in angle of internal friction (1.0°) and cohesion (4 kPa) of soil MH (or MV and ME) causes difference in foundation size up to 21.6% (design by the DA2). The smallest difference in foundation size (10.0%) is reached for soil MS when difference in angle of internal friction is 1° and difference in cohesion is 4 kPa (design by the old STN).
Authors and Affiliations
Giang Nguyen
Keywords
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