Investigation of Stress Increase with Small Scale Model Tests under Shallow Square Footing Resting on Granular Soil


JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, no.1, pp.95-105, 2022 (ESCI) identifier

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Journal Indexes: Emerging Sources Citation Index (ESCI), TR DİZİN (ULAKBİM)
  • Page Numbers: pp.95-105
  • Karadeniz Technical University Affiliated: Yes


Comprehensive numerical, analytical and experimental studies have been conducted to develop reliable and economical design methods for shallow foundations over the last 50 years. For geotechnical engineers, faced with transferring the loads that are more complex and increasing, determination of stress distribution and settlement has become inevitable. In this study, the vertical stress increase occurred under model shallow footing rested on the granular soil was investigated experimentally and analytically. In scope of experimental study, the sand was placed in layers in a tank with two different relative densities (%30-%70) and vertical stress increments were measured by pressure gauges placed at the three different depths (z/B=1, z/B=2, z/B=3). In addition, vertical stress distribution in soil was computed with analytical methods based on elasticity theory (Boussinesq, Westergaard) and the Boston Rule (Approximate Method). As the findings obtained from the small scale model tests were examined, it was understood that relative density is a very effective parameter on stress distribution in granular soils. Also, it can be seen that the methods based on Elasticity theory may be insufficient to predict the stress increase in granular soils.