LOAD CAPACITY OF RCC PILES IN LIQUEFIABLE SOIL

Abstract

In seismically active places, liquefaction has been a major source of damage to civil engineering structures. Liquefaction damage to deep foundations can be extremely severe. Many researchers have studied the seismic behavior of pile foundations in order to build structures that are safer and more cost-effective. Traditional approaches for estimating ultimate lateral pile load capacity are typically based on lateral soil resistance expressions and assume distributions of lateral soil pressure mobilized along the pile embedded depth. However, because of the nonlinear and irregular fluctuation of lateral soil resistance with depth in nonhomogeneous soils, standard approaches provide major challenges. Therefore, analysis of pile response in liquefiable soils is very important nowadays. In this work, excel sheets have been developed for calculating liquefaction zone and also for analysis on pile response in cohesionless soils which are in saturated condition. Soil profile has been considered in three layers, starting with loose sand at top, medium at middle and dense at bottom. Vertical as well as horizontal loads are applied on the pile head. After applying both the loads, the analysis was performed using excel sheet and results were obtained. Deflection and moment for free head and fixed head pile have been measured and shown in result. Excel sheet has been developed to measure Vertical load capacity and Pull-out load capacity. Also excel sheet has been developed to calculate liquefaction zone. Load capacities can be calculated post liquefaction, with the help of excel sheets. The pile used was of 600 mm diameter and 50M length. Vertical load of 200 kN and lateral load of 100 kN were applied, respectively. After analysis it showed a lateral deflection of 3.2mm and 0.8mm for free head and fixed head, respectively. Also, the moment calculated were 197.1 kN/m and 311.73 kN/m for free head and fixed head, respectively.