Low-position vacuum preloading rapid reinforcement method of soft foundation in hydraulic filling and reclamation

Abstract

The invention provides a low-position vacuum pre-pressing rapid reinforcement method of a soft foundation in hydraulic filling and reclamation and relates to a drainage and reinforcement method of hydraulic fill sludge in a hydraulic filling and reclamation project. According to a single drainage and reinforcement unit, conventional drainage boards are used and are connected with drainage pipes; the connection between the drainage pipes and drainage branch pipes, the connection between the drainage branch pipes and a drainage trunk pipe and the connection between the drainage trunk pipe and a drainage main pipe are realized by adopting a conventional method; and then the drainage main pipe is connected with drainage equipment by adopting the conventional method to form a drainage pipe network. After hydraulic filling, a covering layer is laid on the surface of a sludge layer and water permeation prevention treatment is conducted. The drainage pipe network is arranged in a hydraulic filling sludge layer and can be horizontally arranged in a single layer, two layers or more than two layers. Meanwhile, drained water is used as a piling carrier to preload the hydraulic filling sludge. By adopting a simple construction method of combining low-position drainage with high-position drainage in the technical scheme, the construction operation difficulty is greatly reduced, the draining efficiency of hydraulic filling sludge is improved, and the construction cost and the construction period are greatly reduced.

Description

technical field [0001] The invention relates to a drainage solidification method for dredging and filling mud in a dredging and land reclamation project. Background technique [0002] Before the realization of the method of the present invention, with the rapid development of the country's economy, the contradiction between the land for infrastructure construction and the protection of basic farmland became more prominent. A large-scale land reclamation project was carried out. The basic method of land reclamation is to blow and fill the seabed silt to a predetermined area through special equipment, and then perform drainage and solidification treatment on the blow-filled silt to make it meet the requirements of construction land. The most primitive method of land reclamation is natural drying and solidification after dredging to make the water in the dredged sludge evaporate gradually, or to lay out drainage ditches in the dredged sludge layer so that the water in the dred...

AI Technical Summary

Problems solved by technology

The above-mentioned technical schemes all still adopt the high-level drainage method of blowing and filling first, and then laying drainage boards and laying drainage pipe networks. The common problems that exist are: 1. Since the drainage boards are manually or mechanically inserted after the completion of the blowing and filling process , so it is still necessary to carry out surface treatment on the dredged silt layer, such as laying geotextiles, making thorn rakes or bamboo rakes, laying engineering sand or silt, etc., to meet the requirements of the drainage board laying machinery entering the site; 2. Due to Drainage boards need to be installed vertically in the dredged sludge, and special drainage board drilling machines are required, which will inevitably make the operating procedures more cumbersome and complicated, labor-intensive, and greatly increase the cost of drainage and solidification of dredged sludge; 3. When plugging the drainage board and encountering muddy soil, the drainage board will rub against the mud, smear the filter cloth wrapped by the drainage board, and close the gap of the filter cloth, which will obviously reduce the vacuum drainage efficiency and increase the drainage cost; 4. After a lot of scientific calculations and engineering practice, it has been proved that the vacuum equipment used at home and abroad at present, the vacuum degree of the vacuumed soft base membrane is zero below 2m, and the water below the membrane is squeezed out by superstatic pressure.

Therefore, the high-level drainage method is not suitable for dredging and filling the silt drainage reinforcement with a depth of more than 2m.

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