Backanalysis of the earth pressure coefficient at rest in Brno clay on the basis of convergence measurements
Abstract
In the paper, we evaluate the earth pressure coefficient at rest in overconsolidated clay using backanalysis of deformation measurements in underground cavity. The case study has been located in Brno, Czech Republic.
It has been excavated as a part of geotechnical investigation for Královo Pole tunneling project. The model was simulated using finite element method in 3D (software Plaxis 3D).
In the analyses, we utilized recently developed hypoplastic model with small strain stiffness anizotropy. Model qualities are demonstrated by comparison of measured and monitored displacement fields around exploratory adit.
Soil anisotropy was shown to influence the back-analysed value of K0 significantly. The neighbouring adit had also remarkable effect on predicted K0.
The analyses indicated K0 equal to 0,81.