부산대학교 도서관

The article considers the application of geogrids in the foundation work in collapsible loess of the Workshop for Volume Reduction and Deactivation of materials from the decommissioning of four power units of the Kozloduy NPP. In conformity with the design the loess base improvement had to be realized by a loess-cement cushion, built under the foundations. Foundation work by means of such a cushion in loess is a Bulgarian method, applied in the construction of dozens of buildings and facilities, including the facilities of the six power units of the Kozloduy NPP. In the case of the Workshop its implementation was seriously hampered due to soil over-moistening at the excavation bottom. The over-moistened soil was with soft consistency in some places and it was impossible to spread and compact on it the first soil layers of the cushion. This obstacle was overcome by placing a 30-50 cm thick compacted layer of river gravel, reinforced with a geogrid along the entire excavation bottom. The reinforcement was made by a layer of a monolithic hexagonal triaxial Tensar TriAx TX160 geogrid. The technology of constructing the strengthened gravel layer and the soil-cement cushion and the results of the plate tests are described in the article. Other possibilities for geogrid uses are considered for foundation in loess with a soil-cement cushion, for example between some of its layers. [ABSTRACT FROM AUTHOR]