Intrusion of Geomesh in Gypseous Soil Under Single Footing

Methods to improve bearing capacity of footing resting of collapsing soil can, in fact, take two approaches, improving soil strength properties and intrusion of reinforcing sorces into soil. The footing is modeled by a square steel plate ۰.۱ by ۰.۱ m. The footing is loaded as to have a stress of ۴۰ kPa and settlement is receded in dry and in soaking conditions. Two depths of the geo-mesh reinforcement are used, one B (B is width of footing) and ۰.۵B. For one B depth, three different square sizes of geo-mesh are used, ۴B, ۶B, and ۸B. For the reinforcement depth of ۰.۵B the three sizes of the geo-mesh used are, ۳.۵B, ۵.۵B, and, ۷.۵B. Results reveal that the best improvement obtained is the case of square geo-mesh width of ۷.۵B and located at depth of B/۲ under footing, with an improvement in terms of collapse settlement of ۳۵%, and a settlement reduction in dry condition of ۵۰%. The least improvement is the case of square geo-mesh with width of ۴B and depth of one B, and it was really negligible, about ۴% decrease in collapse settlement. Other cases varied between the two mentioned ratios. For findings of study, author recommends not to use geomesh size less than size of footing and not to place it in a depth more than half footing width. As such, in a whole, the effectiveness of geomesh in reducing the settlement of collapsing soil is obvious if used in proper way.

کلیدواژه ها:

footing ، Geo-grid reinforcement ، Geo-mesh reinforcement ، Laboratoryl ، Soil Improvement