Open AccessEffect of Earthquakes over Time on the Geogrid-Pile Foundation System in Loose Sand
Author(s) -
Athraa A. Al Ghanim,
Qassun S. Mohammed Shafiqu,
Asma Thamir Ibraheem
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/671/1/012074
Subject(s) - geogrid , pile , geotechnical engineering , bending moment , foundation (evidence) , settlement (finance) , geology , structural engineering , engineering , reinforcement , archaeology , world wide web , computer science , payment , history
Researchers and engineers have developed several means to enhance the dynamic lateral stability of civil engineering structures, such as geosynthetic reinforced earth retaining structures to resist excessive earthquake shaking. There is, however, as yet little information about using geogrids with pile foundations under earthquake loadings. This study thus linked a single embedded pile in loose sandy soil with a geogrid, with the system then subjected to two different seismic waves. The laboratory tests were carried out on single pile with a length to diameter ratio of 25 in poorly graded soil (SP) with a relative density of 30%. The geogrid used in the research was Nelton CE121 geogrid (700×700 mm), which was connected with the pile at a depth of 1/8 of the pile length. The model was then subjected to replications of both the Ali Al Gharbi and Halabjah earthquakes, which hit Iraq in 2014 and 2017, respectively. It was found that using geogrid with pile foundation reduced the settlement in the pile by about 50% and 90% for the Halabjah and Ali Al Gharbi earthquake forces, respectively. The maximum bending moment was also reduced, with the bending moment ratio at the pile surface for the Halabjah and Ali Al Gharbi earthquakes being 70% and 50% respectively. The settlement ratio increases as magnitude of earthquake decreases.