Abstract
In order to explore bearing characteristics of a new-type static drill rooted nodular pile foundation (SDRN), which is composed of PHC pile, bamboo joint pile, and cement soils, field tests of three piles were carried out by embedding internal rebar stress gauges to collect test data. The test results show that the SDRN piles were under elastic state and the load-settlement curves changed slowly before reaching the ultimate capacity. As pile head loads increased, the pile shaft frictions developed progressively, and axial forces gradually reduced along pile depths. Taking into account the interaction between the pile, the cement soils, and surrounding soils, a simplified method for calculating settlements and bearing capacity of SDRN piles was proposed. With corresponding parameters, the computing results obtained by the proposed method were compared with the field experimental data, which indicates acceptable agreements; thus, it is concluded that the applicability and predictive capability of the proposed method were verified.
Highlights
With advantages of economical benefits and fast piling speed compared with bored piles, prestressed hollow concrete (PHC) piles are widely used in deep soft soil areas within China recently
The shaft friction of PHC pile is always small when used in soft soils, resulting in the ultimate bearing state being reached and thereafter large settlements happen. e construction process of PHC pile produces severe soil squeezing effect on the surrounding infrastructure and soils [1, 2]
It is concluded that the static drill rooted nodular pile (SDRN) was firstly used in Japan and introduced in China [3, 4]; the SDRN pile consists of PHC piles, bamboo joint pile, and surrounding cemented soils. e static drill rooted method is new and environment friendly which has insignificant effects on the surrounding foundations and largely decreases the mud emissions [4,5,6]. e construction process can be summarized as follows: (1) Drilling hole: set up the drill machine at the design position and drill the pile hole using a special auger, with controllable drilling speed according to the geological conditions
Summary
With advantages of economical benefits and fast piling speed compared with bored piles, prestressed hollow concrete (PHC) piles are widely used in deep soft soil areas within China recently. E objective of this paper is to obtain a better understanding of the behavior of the static drill rooted nodular pile (SDRN) based on the analysis of field tests, and proposes a simplified calculation method to predict the bearing capacity and settlements for this new type pile, considering the interaction of pile, cement soils, and surrounding soils.
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