CFG core gravel composite pile, composite foundation formed by CFG core gravel composite pile and construction method

Abstract

The invention discloses a CFG core gravel composite pile, a composite foundation formed by the CFG core gravel composite pile and a construction method. The CFG core gravel composite pile comprises aCFG core and a gravel shell wrapping the CFG core, wherein the gravel shell is formed by sand and macadam according to the volume ratio being (1-2):1. The composite foundation formed by the CFG core gravel composite pile is characterized by comprising a soft soil foundation, the CFG core gravel composite pile driven into the soft soil foundation and a mattress layer filled into the position abovethe CFG core gravel composite pile and the soft soil foundation, and a geogrid is arranged on the mattress layer. The invention further discloses a construction method. The CFG core gravel composite pile, the composite foundation formed by the CFG core gravel composite pile and the construction method have the beneficial effects that the construction is easy and convenient, the pile forming speedis high, super-static pore water pressure in soil between piles in the construction period is quickly scattered, the soil strength is quickly restored, the working period is shortened, the post-construction settlement is small, and the industrial waste is used for reducing the building cost of projects; and the economic benefit and the social benefit are obvious.

Description

technical field [0001] The invention relates to a ground treatment method, in particular to a CFG (cement fly ash gravel) core sand-stone composite pile for strengthening soft ground, and the composite ground formed therefrom and a construction method. Background technique [0002] Soft soil has the characteristics of high compressibility, low shear strength, low permeability, and poor bearing capacity. According to the principles, the treatment methods of soft soil foundation mainly include increasing the density of the soil, replacing soft soil with other materials or mixing them into the soil, and improving the stress state in the soil. Sand and gravel piles have problems such as poor continuity, low bearing capacity, and easy instability during construction when the strength of natural soft soil is low; CFG piles are short for cement fly-ash gravel piles (Cement Fly-ash Gravel Pile). The high bond strength pile formed by mixing cement, fly ash, crushed stone, stone chip...

AI Technical Summary

Problems solved by technology

Sand and gravel piles have problems such as poor continuity, low bearing capacity, and easy instability during construction when the strength of natural soft soil is low; CFG piles are short for cement fly-ash gravel piles (Cement Fly-ash Gravel Pile). The high bond strength pile formed by mixing cement, fly ash, crushed stone, stone chips or sand with water forms a composite foundation together with the soil and cushion layer between the piles. Under the action of load, the soil and CFG pile reinforcement jointly bear For the upper load, CFG piles can increase the bearing capacity of the composite foundation and reduce deformation, but the excess static pore water pressure dissipates slowly during construction, and the post-construction settlement is large, and excessive excess static pore water pressure is generated during piling during construction Often lead to fracture of adjacent newly formed piles

In actual engineering, the ground conditions of some soft soil sites are complex, and problems such as weakness, settlement, consolidation, and liquefaction need to be solved at the same time, and the requirements of the construction period must also be considered. A single foundation treatment method often fails to achieve the expected results and construction. Duration requirements

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