Variable-spacing rigid pile composite foundation for improving embankment stability

Abstract

The invention discloses a variable-spacing rigid pile composite foundation for improving embankment stability. The distance from a slope toe to a slope shoulder of an embankment side slope is L, and the arrangement area of all rigid piles is an area covered by an embankment and is divided into an arrangement area of large-spacing piles on the inner side and an arrangement area of small-spacing piles on the outer side; the small-spacing rigid piles adopt rigid piles which have a small spacing and certain ductility and are not provided with pile caps, and the large-spacing rigid piles adopt rigid piles which have a large spacing and are provided with pile caps. The variable-spacing rigid pile composite foundation solves the engineering problems of embankment instability and greatly reduced bearing capacity caused by sequential brittle fracture of the inner side pile bodies due to the fact that the outer side pile bodies of the rigid pile composite foundation are prone to brittle fractureunder large bending moment, and the large-spacing inner side piles with the pile caps can greatly reduce the construction cost on the basis that sedimentation and uneven sedimentation are effectivelycontrolled. The variable-spacing rigid pile composite foundation is simple in construction, good in total settlement control effect, capable of greatly improving the stability of the embankment, highin safety, high in applicability and good in economical efficiency.

Description

technical field [0001] The invention relates to a civil foundation, in particular to a composite foundation of rigid piles with variable spacing. Background technique [0002] In recent years, with the rapid development of my country's high-speed railway construction, higher requirements have been put forward for the construction speed of embankments and settlement control. In my country's coastal areas, the upper soil is mostly saturated soft clay, which has low shear resistance and poor drainage capacity, so the embankment is prone to instability and damage. In order to meet the requirements of rapid construction and settlement control, rigid pile composite foundation has been more and more widely used. Rigid piles include CFG piles, plain concrete piles, reinforced concrete piles, PCC piles and other pile types. High, strong bearing capacity, good settlement control effect, fast construction speed and other advantages, the engineering application is very wide, but its co...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the present invention provides a variable spacing rigid pile composite foundation that improves the stability of the embankment, which solves the problem that the outer pile body of the traditional equidistant rigid pile composite foundation is prone to brittle fracture under a large bending moment, resulting in The brittle fractures of the inner piles occur sequentially, which leads to the instability of the embankment and the greatly reduced bearing capacity. At the same time, it solves the problem of poor uneven settlement control effect when the inner pile spacing is large, and a significant increase in cost and waste of resources when the spacing is small. question

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