Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Study on Model Micropiles under Oblique Pullout Loads
Experimental study on model micropiles was undertaken in field conditions to ascertain pullout capacity of vertical micropile under oblique loads. Micropiles of 25-mm diameter and embedded lengths of 300 mm, 400 mm and 600 mm (L/D-12, -16 and -24) were auger-drilled and casted in silty sand (SM soil). Reinforcement in the form of 10-mm Tor steel bar was provided at the center of each borehole. Thoroughly mixed neat cement water grout of 0.45 w/c ratio was poured into boreholes under gravity through a pipe. Ample cured micropiles were tested under incremental pullout loads applied at 0-, 5-, 10-, 15-, 20-, 30-, 45- and 90-degree inclinations with respect to axis of micropiles i.e. vertical. For each load inclination, ultimate pullout capacity was determined from load-deformation curves and was also calculated theoretically. Test results indicate that ultimate pullout capacity increases with increase in L/D ratio and decreases as load inclination increases with micropile axis. Load inclination, at which mode of failure changes from axial to lateral (i.e. critical angle), was found between 5-10 degrees with axis of micropile. Lateral pullout capacity is obtained at 25-30% of the axial pullout capacity.
Experimental Study on Model Micropiles under Oblique Pullout Loads
Experimental study on model micropiles was undertaken in field conditions to ascertain pullout capacity of vertical micropile under oblique loads. Micropiles of 25-mm diameter and embedded lengths of 300 mm, 400 mm and 600 mm (L/D-12, -16 and -24) were auger-drilled and casted in silty sand (SM soil). Reinforcement in the form of 10-mm Tor steel bar was provided at the center of each borehole. Thoroughly mixed neat cement water grout of 0.45 w/c ratio was poured into boreholes under gravity through a pipe. Ample cured micropiles were tested under incremental pullout loads applied at 0-, 5-, 10-, 15-, 20-, 30-, 45- and 90-degree inclinations with respect to axis of micropiles i.e. vertical. For each load inclination, ultimate pullout capacity was determined from load-deformation curves and was also calculated theoretically. Test results indicate that ultimate pullout capacity increases with increase in L/D ratio and decreases as load inclination increases with micropile axis. Load inclination, at which mode of failure changes from axial to lateral (i.e. critical angle), was found between 5-10 degrees with axis of micropile. Lateral pullout capacity is obtained at 25-30% of the axial pullout capacity.
Experimental Study on Model Micropiles under Oblique Pullout Loads
Bhardwaj, Sunil (Autor:in) / Singh, S. K. (Autor:in)
Geo-Shanghai 2014 ; 2014 ; Shanghai, China
Tunneling and Underground Construction ; 610-621
05.05.2014
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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