Abstract
Pre-drilling is a widely used technique to get the detailed geological condition at the location of the bored pile foundation prior to its construction. It is often a necessary step for bored piles supported by strata, as its results are helpful for finalizing the pile length in design stage, which often requires the pile to be embedded into the rock strata at certain depth. The aim of the paper is to find the optimal (normally the lowest) point of rock strata at the purposed pile location, so that the optimal length required for the pile can be determined. To achieve this, geological prospecting data of the site needs to be analysed and the optimal pre-drilling point needs to be determined. The model developed by this study is based on the geological prospecting data and the pre-drilling results of a real project with a sharp slope of strata. It is found that by using the method introduced in this study, higher accuracy results could be obtained with less pre-drilling works required, hence the time and the cost of pre-drilling can be greatly reduced.
Highlights
Pile foundation is a common technology used by foundation of high-rise buildings and large size infrastructures due to its load bearing ability and stable performance
Many studies related to the quality control of large diameter bored piles during construction have been carried out in recent decades
Some in-situ advises and control skills are summarised to improve the quality of bored pile construction, e.g. [1,2]
Summary
Pile foundation is a common technology used by foundation of high-rise buildings and large size infrastructures due to its load bearing ability and stable performance. Many studies related to the quality control of large diameter bored piles during construction have been carried out in recent decades. Some in-situ advises and control skills are summarised to improve the quality of bored pile construction, e.g. Pre-drilling is a low-cost method to detect the actual geological condition for a pile foundation. The purpose of pre-drilling is to report the location and depth of the specific strata layer(bearing layer) in which the pile foundation should be embedded as well as to find other buried objects in advance. The length of the pile foundation (the required length that the pile needs to be embedded into bearing layer plus the depth of rock strata) can be confirmed by referring to the design criteria and related standards[4,5]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call