Fast Estimation of the Influence Zone Depth inside the Subsoil in Relation to the Various Shapes of Footing

P. Kuklík
Department of mechanics, CTU in Prague, Faculty of Civil Engineering, Czech Republic
M. Kopáčková
Department of mathematics, CTU in Prague, Faculty of Civil Engineering, Czech Republic
M. Brouček
Department of mechanics, CTU in Prague, Faculty of Civil Engineering, Czech Republic

Keywords: pre-consolidation pressure, influence zone, Kantorovich method, fundamental solution,
layered subsoil, geostatic stress state

ABSTRACT:
For the calculation of foundation settlement it is recommended to take into account so called influence zone inside the subsoil bellow the carrying structure. Influence zone inside the subsoil is the region where the load has a substantial influence on the deformation of the soil skeleton. The soil skeleton is preconsolidated or over consolidated due to the original geostatic stress state. An excavation changes the original geostatic stress state and it gives the space for loads passed from upper structure. The theory of layered subsoil
in Westergard manner is selected for the vertical stress calculation. The depth of influence zone is calculated from the condition, that the original geostatic stress is equal to the new geostatic stress due to excavation plus the vertical stress influenced by the loads of upper structure. The way, how to estimate the depth of influence zone, is expressed in the graphs. The contribution further introduces a distinction between four shapes of footing types regions of surcharge, namely stripe, rectangle, square and circle. The effect of influence zone is also
presented on the curves of load transmission. The several in situ tests were carried out to verify the governing idea of the proposed theory.

Fast Estimation of the Influence Zone Depth inside the Subsoil in Relation to the Various Shapes of Footing 2011-04-14T04:57:00-07:00 Rating: 4.5 Diposkan Oleh: Andre S