Packingless fast vacuum prepressing dynamic consolidation method

Abstract

The present invention relates to large area foundation treatment, and is especially process of treating large area soft foundation. The process includes the following steps: 1. arranging filter openings according to the stratum state; 2. inserting PVC filter pipes with filter pores in the calculated size into stratum, connecting the upper ends of the filter pipes beyond the soil layer to the main pipe and connecting the main pipe directly to the vacuumizing equipment; 3. vacuumizing based on the design requirement; and 4. withdrawing filter pipes after the soft soil layer consolidates and ramming to reach even high foundation strength. The process of the present invention has short construction period, less vacuum degree loss, saving in construction material and high foundation reinforcing effect.

Description

Technical field: [0001] The invention relates to a large-area foundation treatment method, in particular to a large-area soft foundation treatment method, which belongs to the innovative technology of the large-area soft foundation treatment method. Background technique: [0002] With the acceleration of my country's modernization process, in the process of (coastal) city construction, a large number of soft soil foundations need to be treated, and the widely used soft foundation treatment methods are: [0003] 1. Vacuum preloading method: This method uses atmospheric preloading as the preloading load. First, a layer of permeable sand and gravel is laid on the ground, and then plastic drainage boards are inserted according to the designed spacing using a plugging machine, and then covered on it. A layer of airtight sealing film, and then use a vacuum pump to pump air to maintain a high vacuum in the permeable material, generating negative pore water pressure in the pore wate...

AI Technical Summary

Problems solved by technology

[0005] (1) There must be auxiliary engineering measures for trenching and film pressing to form a vacuum, and because of the anti-sliding stability requirements, it is necessary to unload and remove the film to continue construction. The process is complicated, the processing time is relatively long, and the cost is also high

[0006] (2) The vacuum degree provided by the vacuum pump must be transmitted to the soft soil layer through the permeable sand and gravel layer, and the vacuum degree loss is relatively large

prolong the construction period

[0007] (3) The plastic drainage board inserted in the construction process is left in the soil layer after the construction and cannot be reused, causing a great waste of materials and causing some pollution to the soil

[0009] (5) The laying of the sand cushion requires a large amount of medium-coarse sand, and the cost is high

[0010] (6) For the soft soil layer at the bottom of the water, if the soft ground treatment operation is carried out underwater, the traditional vacuum preloading method will not be able to be carried out because the sealing performance is not up to the requirements, and the soft soil layer has to be drained before the soft ground treatment operation. Ground treatment has a certain impact on the local ecosystem

[0012] The dynamic compaction method is widely used, but for the cohesive soil with high saturation, the treatment effect is not good, especially for the muddy soil foundation, the treatment effect is even worse

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