BEHAVIOUR OF STRIP FOOTING RESTING ON SAND BED REINFORCED WITH 3D INSERTS by Prince Karandeep Singh
Abstract
Attempts are being made worldwide to investigate various measures to reclaim land not found suitable for the engineering applications. One such area is strengthening of land by inserting reinforcement as geogrids, Geocells, fibers, steel bars etc. in this direction, a series of laboratory plate load tests were conducted on model strip footing resting on sand reinforced with 2D, single sided and double sided 3D reinforcement. The load carrying capacity, settlement, depth of reinforcement layer and effect of variation of height of vertical members of single sided and double sided 3D reinforcements were investigated. Load settlement behavior of soil reinforced with 2D strips, horizontal strips attached with vertical strips on upper side and , 2D strips attached with vertical strips on upper and lower side were studied at a different depth were observed, where B is width of footing. An increase of about 111% in load carrying capacity was observed when 2D strips are placed. If horizontal strips with 1cm high vertical strips on upper side are placed at the same depth a increase of 230% was observed. If the height of vertical strips was increased to 2cm, the increase of 270% in load carrying capacity was observed but a decrease trends was found if height of vertical strips was further increase to 3cm. A vertical strip on lower side was also introduced with 2cm vertical strips on upper side as a 3D reinforcement and found maximum load carrying capacity was achieved when the height of vertical strips are 2mm at both side. As the double sided vertical strips attached with horizontal not only increases the confinement of soil but also increases passive resistance of soil against the shearing as compared to conventional geosynthetics.
