engleski

Foundation instabilities in Loess, Vukovar (Croatia)

In the frame of RECALL project (Resilient European Communities Against Local Landslides), co - funded by the European Commission Directorate – General Humanitarian Aid and Civil Protection (DG ECHO) the soil instabilities of a secondary school was studied. The school is located in the city of Vukovar, on the right bank of Danube River, on the morphologically exposed ridge. After the building renovation in 1999 the first cracks on the school walls have been observed in 2004. Recently cracks on the school walls opened up to several tens of millimetres. After the comprehensive geotechnical surveys the first remedial measures were partly implemented in 2008, but they didn’t solve the problem of subsidence. The grounds as well as the entire ridge are composed of a fine-grained (silt size), homogeneous, highly porous, slightly coherent aeolian sediments - loess. Due to specific physical and chemical characteristics loess is usually very susceptible to collapse. Geotechnical properties of loess material mostly depend on the changes in water content. Therefore, the presence of water in loess sediment is considered as the main triggering factor for the observed ground subsidence. Grounds around object are soaked by several water sources. As an essential short-term mitigation measure the continuation of displacements and groundwater monitoring and the overall water drainage are recommended, while the subsequent remedial measures should be focused to the foundation stabilization by the deep micro-pilots into the intact sediment.

loess; subsidence; Vukovar; RECALL

nije evidentirano