Abstract
Types of tapered piles are widely applied in tank foundation consolidation, but their inherent deficiencies in design and construction limit their further promotion. Vortex compression pile is a novel nodular pile. Compared with the traditional equal-section pile, vortex compression nodular pile is featured by stronger bearing capacity and slighter settlement. In this paper, the model test results showed that vortex compression nodular pile can greatly improve the bearing capacity and reduce the settlement. Through the finite element software ABAQUS analysis the bearing characteristics of equal-section pile foundation and vortex-compression nodular pile foundation were compared. The three-dimensional solid model was established by ABAQUS finite element software. The impact of cushion modulus, cushion thickness, vertical load, pile modulus, soil modulus around the pile on the bearing capacity of the vortex-compression nodular pile foundation were studied.
Highlights
In China, most storage tanks in oil and gas reserve projects, with a volume larger than 105 m3, are built on soft foundation area [1]. These tanks are featured by large volume and heavy load, putting strict requirements on the bearing capacity of tank foundation and the control of uneven settlement [2]
Because of improper site selection, poor foundation consolidation, and improper foundation structure form, uneven settlement of tank foundation has become outstanding, which results in tank body tilt, floating roof displacement and sticking, tank body distortion, and other related problems [3,4]
Through the analysis of compaction test in specific projects, Lin P. concluded that gravel pile reinforcement can improve the bearing capacity of tank foundation by compacting soil, which is simple in construction, mature in technology, and can save a lot of cement and steel [6]
Summary
In China, most storage tanks in oil and gas reserve projects, with a volume larger than 105 m3 , are built on soft foundation area [1]. These tanks are featured by large volume and heavy load, putting strict requirements on the bearing capacity of tank foundation and the control of uneven settlement [2]. Through the analysis of compaction test in specific projects, Lin P. concluded that gravel pile reinforcement can improve the bearing capacity of tank foundation by compacting soil, which is simple in construction, mature in technology, and can save a lot of cement and steel [6]. Jia J carried out static load test, dynamic penetration test, and standard penetration test on gravel pile composite foundation
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