Compensation of subsurface discontinuities by geosynthetic reinforced layers

Continuous deformations in the subsurface have been a known problem for a long time. To a certain degree, their development is predictable and manageable. However, there is no general prognosis method for discontinuous deformations induced for example by mining or stiffness differences in the subsurface. Resulting damages are subjected to cost- and time-intensive repairmeasures. In 2008, geosynthetic reinforced layers were installed beneath a highway in Germany (BAB 57) to equalise a vertical offset and minimise the mechanical stress to the structure. So far, there is no analytical approach for an efficient design of such constructions. Large-scale tests in literature prove that geogrids limit the development of shear bands and distribute local strains. Therefore, they can contribute to obtain temporary acceptable deformations for the affected structure. Considering previous observations, an analytical design approach was derived. Comparison with centrifuge model tests show a good accordance.