Zur Tragfähigkeit einzelner und benachbarter Streifenfundamente - Berechnungen zum Einfluss der Sohlreibung und von Wechselwirkungsfaktoren mittels der KEM

On the bearing capacity of single and interfering strip footings - Analysis of the influence of footing-base-friction and interference factors by the KEM.

The assessment of bearing capacity of shallow footings is one of the main topics in soil mechanics as well as in foundation engineering. In Germany the safety analysis is regulated in [1]. Chosen boundary conditions are considered. The so called ground failure equation is based on the superposition principle after Terzaghi. In the present article the significant influence of base-friction on the bearing capacity of shallow strip footings will be discussed. The general approach of the bearing capacity analysis will be extended to the boundary condition of two adjacent interfering rough footings. By using the Kinematical Element Method (KEM), originally developed in [2] and [3], an appropriate failure mechanism will be developed and bearing capacity calculations are carried out for varying distances S between the footings. Also different friction angles &phgr; of the soil will be considered in this parameter study. By defining an efficiency factor &eegr;, as the ratio of an interfering footing and one that is isolated, the change in bearing capacity can be evaluated. A comparison with available theoretical and experimental data confirms the present KEM-results.