Estimating the Bearing Capacity of Bored Pile Based on the Data of Static Cone Penetration

According to the current specifications such as "Technical Specification for Building Pile Foundations" (JGJ 94—2008) and "Specifications of Foundation of Highway Bridges and Culverts" (JTG 3363—2019), the standard values of vertical ultimate bearing capacity of single pile calculated by static cone penetration test are all for precast pile, and there is still no formula for bored cast-in-place pile. In this study, based on the actual situation in Beijing and the relationship between the empirical values of the concrete precast pile and the bored pile with slurry wall protection in the current code, an empirical formula is established to estimate the standard value of the vertical ultimate bearing capacity of the bored pile by the static penetration method. Combined with engineering examples, it shows that the value of estimating the bearing capacity of bored pile by static cone penetration test is much higher than the traditional look-up table method in deep sand layer.