Method for treating three-layer soft foundation by using I-shaped mixing pile

Abstract

The invention discloses a method for treating a three-layer soft foundation by using an I-shaped mixing pile, which comprises the following steps: the I-shaped mixing pile is arranged on the three-layer soft foundation, the upper part and the lower part of which are soft soil layers and the middle of which is a hard soil layer; the I-shaped soft foundation comprises a middle small pile with smaller diameter, an upper expansion head and a lower expansion head with bigger diameter, the middle small pile is arranged in the hard soil layer at the middle, and the upper expansion head and the lower expansion head are arranged in the upper soft soil layer and the lower soft soil layer. The I-shaped mixing pile forms a compound foundation with two displacement ratios through the change of the pile body diameter, the upper soft soil layer and the lower soft soil layer with poor engineering mechanical properties adopt higher displacement ratio, the middle hard soil layer with better engineering mechanical properties adopts lower displacement ratio, and different soil layers in the three-layer soft foundation are performed the pointed treatment so as to achieve the purpose of saving construction cost.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and is a treatment method applicable to three-layer soft foundations with soft soil layers on the upper part and a hard soil layer in the middle, and particularly relates to a treatment method for three-layer soft foundations using I-shaped mixing piles Methods. Background technique [0002] Cement-soil mixing pile is one of the effective methods to strengthen the soft soil foundation. It uses cement as the curing agent, sprays cement slurry or cement powder into the soft soil while drilling through the deep mixing machine, and mixes the soft soil and solidification on the spot. The cement-soil column with high strength, integrity and good water stability is formed through the physical and chemical interaction between the curing agent and the soft soil. At present, most of the cement-soil mixing piles used in engineering are equal-section mixing piles, that is, the diameters of the sin...

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Problems solved by technology

When cement-soil mixing piles are used to reinforce this kind of three-layer weak foundation, the upper and lower soft soil layers need a higher pile placement rate, while the middle hard soil layer or medium compressive soil layer only needs a lower pile replacement rate. If the traditional cement-soil mixing pile with equal cross-section is used, the replacement rate of the pile body in the middle hard soil layer or medium compressive soil layer is the same as that of the soft soil layer, thus resulting in project waste, and the thicker the middle soil layer, the greater the waste. many

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