Smart Self Drilled Micropile Foundation Solution and Seismic Performance in Fine Sand Strata

摘要

The present work deals with an experimental and time history analysis of self drilled micropile (SDM) foundation using SAP2000-V18. Telecom towers are predominantly subjected to lateral wind and seismic loads having assorted constraints like site accessibility, small foundation area, weak soil strata, sites near restricted noise zone, and restricted construction completion time. Liquefiable grayish fine sand strata is observed in Delhi region of India. A group of four 14 m deep and 200 mm diameter (D) of SDM is reinforced with high strength Ischebeck Titan hallow anchor rod of 52 mm outer and 26 mm inner diameter. The full scale cyclic axial and lateral load test results denotes that the performance of SDM is good for axial tensile and compressive loads, but poor against the lateral loads. Time history parametric study is carried out for time, peak gravity acceleration (PGA), and centre to centre pile spacing and its outcome is the optimum pile spacing is in between 4 D to 4.5 D. Lateral pile displacement is proportional to PGA and pile spacing. Normalized curve for shear and moments is derived.