A method of treating soft soil foundation with bagged slurry-solid gravel pile combined with vacuum preloading

Abstract

The invention provides a method for treating a soft soil foundation through combination of a bagged grouting gravel pile and vacuum preloading. The method comprises the steps that (1) shallow vacuum drainage pretreatment is conducted on the soft soil foundation to form a construction machinery work platform with a certain strength and bearing capacity; (2) bagged grouting gravel pile construction is carried out through an immersed tube method, and grouting tubes are embedded in the pile; (3) the bagged grouting gravel pile serves as a vertical drainage channel, and the deep soft soil foundation is treated through directly draining type vacuum preloading; and (4) grouting is conducted on the bagged grouting gravel pile through the embedded grouting tubes, the strength of a pile body is improved, and a rigid pile composite foundation is formed. By means of the method for treating the soft soil foundation through combination of the bagged grouting gravel pile and vacuum preloading, the purposes of economy and environmental protection are achieved, construction is easy and convenient, and a sand cushion is omitted; the method is applicable to treatment of a large-area ultra-soft clay foundation with the very high moisture content or a large-area new hydraulic fill mud foundation with the very high moisture content; the reinforcing efficiency is remarkable, the foundation treatment period can be substantially shortened, and the cost of construction is reduced.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment, and relates to a method for treating large-area deep soft soil foundations, in particular to a method for treating soft soil foundations with bagged slurry-solid gravel piles combined with vacuum preloading. Background technique [0002] Vacuum drainage and preloading technology has the advantages of fast loading speed, no need for heaped fillers, and no foundation instability during loading. It has significant advantages and is currently widely used in land reclamation projects in coastal areas. However, because the strength of this type of foundation is too low to meet the needs of construction machinery such as inserting machines, and the depth of artificial inserting is limited, shallow pretreatment is generally required first. [0003] The bagged gravel pile is based on the problem that the strength of the soil around the pile in weak foundations is often not enough to form the...

AI Technical Summary

Problems solved by technology

However, because the strength of this type of foundation is too low to meet the needs of construction machinery such as inserting machines, and the depth of artificial inserting is limited, it is generally necessary to perform shallow pretreatment first.

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