Dear reader we will learn in this post about predrilling method of piling in plastic clay soil. The piles are the deep component of pile foundation system where some piles are embedded by thick embedment called pile cap. We have published many posts about pile cap and also about pile group. We will not go to that point. We are concerned here about drilling of piles in problem soil-plastic clay.
Any matter takes an amount of space just equal to its volume. The pile driven in the soil also takes its space and displacing, more accurately, a bit compacting surrounding soils. The plastic clay in saturated condition results a problem of displacing surrounding soil enough to disturb and sometimes result distress with a heaving phenomenon.
This heaving sometimes pull out a bit surrounding piles driven previously, resulting losing its capacity to transfer load to the firm stratum to which it was designed for. Sometimes this pile is required to be redriven.
Now redriven produce a solution for piles, but how the distress of surrounding structures can be recovered. For this situation a method of drilling is used which is called predrilling. In the next post we will learn about other problems that can arise from driving pile in plastic clay and its solution named previously predrilling. .