Large-area soft soil foundation duplex negative pressure consolidation processing method

Abstract

The invention relates to a large-area soft soil foundation duplex negative consolidation processing method, comprising the following processes of: step 1, negative pressure consolidation: (a) paving plastic woven cloths in an area to be processed, driving a vertical plastic drainage board and a vertical plastic soak-away trench; (b) paving a main pipe and a branch pipe, wherein the vertical plastic drainage board and a transverse plastic drainage board are connected with the branch pipe; (c) paving a geo-membrane, and paving two to three sealing membranes on the geo-membrane; (d) excavating a side ditch pressing membrane; (e) installing a vacuum pump to vacuumize for negative pressure precipitation, wherein the main pipe is connected with the vacuum pump; step 2, well point dynamic arrangement: (a) inserting a well point pipe in a hole inserted by a vertical plastic soak-away trench or nearby the hole; (b) paving the branch pipe, the main pipe and the vacuum pump, carrying out the well point dynamic arrangement; and step 3, dynamic consolidation: a) precipitating and dynamically compacting in the first and second times, carrying out precipitation and dynamic compaction processes on the area to be processed for several times, carrying out multiple rounds of point compactions and finally carrying out a full compaction. According to the large-area soft soil foundation duplex negative consolidation processing method, the bearing capacity of the processed field is higher, the hard crust is thicker and the post-construction settlement is less.

Description

(1) Technical field [0001] The invention relates to a large-area ultra-soft soil foundation treatment method. It is suitable for foundation treatment of newly filled muddy soil. It belongs to the technical field of ground treatment. (2) Background technology [0002] With the rapid economic development of coastal areas, the demand for land is increasing year by year. In recent years, with the development of dredging reclamation and soft foundation treatment technology, it has gradually become possible to use the abundant tidal flat resources along the coast to form land. However, since the new coastal reclamation site is generally silty soil, the water content is high and the strength is low when the site has just been filled, and personnel and equipment cannot directly enter the site for construction in a short period of time. In this regard, in the past two years, improved technologies such as vacuum preloading have been commonly used for soft foundation treatment to me...

AI Technical Summary

Problems solved by technology

[0003] (1) The bearing capacity of the site after vacuum preloading technology has been improved to a certain extent, but it cannot directly meet the needs of high-standard construction sites such as roads and storage yards

[0004] For vacuum preloading technology, the overload stress under the membrane is about 80Kpa. After the site treatment, the bearing capacity of the foundation is generally about 50-60Kpa. The treated site cannot be directly loaded with large engineering vehicles, and cannot be directly used as a roadbed

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