Novel long and short pile foundation treatment structure of collapsible loess area and construction method

Abstract

The invention relates to a novel long and short pile foundation treatment structure of a collapsible loess area and a construction method. The structure comprises two rows of waterproof curtains and a plurality of rows of reinforcing row piles between the waterproof curtains. The interior of each of the two rows of waterproof curtains and one slope toe of a roadbed are located in the same vertical plane. Each waterproof curtain is composed of four rows of compact long piles, wherein every three adjacent compact long piles are located at the three vertexes of an equilateral triangle respectively. The reinforcing row piles are composed of a plurality of compact short piles, and the compact short piles are arranged in a quincunx shape. The waterproof curtains and the reinforcing row piles are covered with a waterproof cushion layer. A soil sample is subjected to indoor soil testing, and the height of the roadbed is determined; leveling, surveying and setting out are carried out; and the waterproof curtains and the reinforcing row piles are built on the outer sides of the slope toes of the roadbed according to the existing construction technology, the waterproof cushion layer is built on the waterproof curtains and the reinforcing row piles, and construction of the foundation treatment structure is completed. The foundation treatment structure is used in highway and railway projects of the collapsible loess area, the requirements of the projects of the roadbed for the bearing capacity and deformation of the foundation are met, the construction period is shortened, the project cost is reduced, and line operation safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of foundation reinforcement treatment, and relates to a reinforcement treatment structure for collapsible loess foundations, in particular to a new type of long and short pile foundation treatment structure in collapsible loess areas; the invention also relates to a construction of the foundation treatment structure method. Background technique [0002] The treatment of foundations in the construction of highways and railways in collapsible loess areas is designed and constructed with reference to the foundation design idea of ​​the largest subsidence potential in the construction industry as the main line and the basic principle of "foundation reinforcement as the main line, supplemented by waterproof and drainage measures". Buildings have the characteristics of large loads, small footprints, and concentrated domestic water, so it is more reasonable for foundation reinforcement to dominate. However, highway...

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Problems solved by technology

At the same time, the collapsible loess foundation has a certain bearing capacity when it is not soaked in water. Therefore, in the case of a small subgrade filling height, the design idea of ​​still adopting foundation reinforcement is too conservative. The foundation treatment has the following problems: 1) The subgrade engineering line is long, and the scope of foundation reinforcement is large, which increases the project cost; 2) The amount of foundation reinforcement works is large, which increases the construction time and inspection time, which affects the construction progress

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