Soft soil foundation treatment method by three-dimensional drainage power pre-pressing consolidation

Abstract

The invention provides a soft soil foundation treatment method by three-dimensional drainage power pre-pressing consolidation, comprising the following steps: (1) ascertaining the layering status and the thickness of a foundation compound soil layer to be processed; (2) inserting a drainage tube well into the soil layer until the drainage tube well reaches at about at least of 2.5m under the baseboard of the soft soil layer; (3) performing overload compound prepressing on the soil layer on earth surface so that pore water of the soft soil layer continuously permeates towards an upper layer and a lower layer with good permeability and the drainage tube well; and (4) discharging water outside the soil layer through a drainage pipe. The major innovation on the existing single-side drainage consolidation, vacuum well point dewatering and dynamic consolidation, and a dewatering prepressing method is a novel power drainage consolidation method with large, fast and effective processing depth; and the treatment method has good application prospect on soft soil foundation treatment of deltas, estuaries and coastal areas with similar sedimentary characteristics.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a three-way drainage dynamic preloading consolidation soft soil foundation treatment method. Background technique [0002] With the vigorous development of my country's Yangtze River Delta, Pearl River Delta, Bohai Rim, Beibu Gulf, and coastal economic and dock logistics parks, the permeability ternary structure and soft soil layers with the characteristics of layered cross-bedding deposition in the estuary and lower reaches of the river There are more and more foundation treatment projects for stratum sites with thin sand and sand lenses. [0003] Such as figure 1 As shown, it is a relatively typical composite stratum structure. The characteristic of this kind of soil is that the upper and lower layers of the site have good permeability, and the middle layer has poor permeability but has corrugated bedding and interlayers with good water permeability. Horizontal thin layer of sa...

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Problems solved by technology

[0005] In view of the above-mentioned defects, the present invention provides a three-way drainage dynamic preloading consolidation soft soil foundation treatment method to solve the technical problem that the drainage consolidation method in the prior art cannot meet the requirements of multi-component structure soil quality for speed and efficiency

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