Treatment method of recent dredger-fill silt foundation

Abstract

The invention relates to the field of building foundations, in particular to a treatment method of a recent dredger-fill silt foundation. The treatment method of the recent dredger-fill silt foundation includes three phases, namely surface vacuum dewatering joint-preloading, vacuum joint preloading and composite foundation. The treatment method is characterized by including the steps: in surface vacuum dewatering joint-preloading, treating the foundation by a, zoning; b, spreading a vacuum dewatering joint-preloading cushion; c, spreading a film and d, evacuating; in vacuum joint preloading, treating the foundation by a, spreading drain boards; b, spreading a film; c, performing vacuum joint preloading and d, performing low-energy forced ramming or impact rolling; and in the phase of composite foundation, adopting conventional composite foundation methods. The treatment method is safe in construction, short in construction period, effective in foundation treatment, low in construction cost, especially suitable for projects of land aggradation by reclamation, which are super-high in water content and ultralow in strength and need instant foundation treatment after filling.

Description

technical field [0001] The invention relates to the field of building foundations, in particular to a treatment method for newly filled mud foundations. Background technique [0002] The current treatment process for recently dredged silt, which has a high water content and almost zero strength, is: after the dredged fill is completed, it should be dried for a period of time (usually more than one year) to make the surface of the dredged silt form a certain After the strength has been improved, then pave basil to form a construction cushion, and after people and machinery can enter the site, start foundation treatment. The foundation treatment methods mainly include surcharge preloading method, vacuum preloading method, and improved vacuum preloading method, such as sandless cushion vacuum preloading method (or direct row vacuum preloading method) which belong to drainage consolidation technology. , Low vacuum preloading method, etc. [0003] The construction of these tech...

AI Technical Summary

Problems solved by technology

Specifically, the traditional dredging and filling silt foundation treatment technology has the following deficiencies: 1. Poor adaptability: although the site has been dried for a period of time, people and machinery can barely enter the site, but the hard crust on the surface is easily disturbed and damaged , which brings great hidden dangers to construction safety; 2. Long construction period: it takes 1 to 2 years or even longer, unable to adapt to the urgent modern construction requirements; 3. Difficult to allocate resources: sand cushions are required during construction , but usually the sand resources in the dredged silt area are very precious, it is difficult to meet the construction requirements, and the treatment effect is greatly reduced; It may lead to the failure of foundation treatment, and it is difficult to remedy in the later stage

[0004] Other construction methods such as high-vacuum compaction method, although used in dredger fill, have significant effects, but it is difficult to adapt to dredger fill silt with excessive clay content

[0005] In addition, almost all current foundation treatment methods pursue one-step completion, thinking that this can save investment and construction period, etc., but the newly dredged silt has its particularity, and its water content is particularly large (up to 200% to 300%), and the corresponding settlement It is also very large, and the drainage channel is not only easy to be smeared, but also will inevitably produce bending, kinks and other phenomena, which will affect its drainage effect. In addition, after the water content of the soil drops to a certain level, it will be more difficult to go down, so it is done in one step. difficult to achieve

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