Soft soil foundation treatment device and method

Abstract

The invention relates to a soft soil foundation treatment device and method. The soft soil foundation treatment device comprises a gas-sand mixed conveying device, a gas-sand spraying device and a power device, wherein the gas-sand mixed conveying device comprises a mixing chamber used for fluidizing sand materials to form gas-sand mixed fluid and a gas generating device; the gas-sand spraying device comprises a drill rod assembly used for being inserted into a soft soil layer downwards, the drill rod assembly communicates with a material conveying pipe, and the drill rod assembly is providedwith a first spraying hole used for spraying the gas-sand mixed fluid outwards; and the power device is used for driving the drill rod assembly to move up and down and driving the drill rod assembly to rotate around the axis of the drill rod assembly. The soft soil foundation treatment device can spray the gas-sand mixed fluid into the soft soil layer to form a horizontal drainage sand layer withgood water permeability, the horizontal drainage sand layer formed by laying under the action of pneumatic force has certain strength and thickness, deformation is not prone to occur, so that a drainage channel is not blocked, and uneven settlement of soft soil can be coordinated; and due to the existence of the horizontal drainage sand layer, additional stress in a soil body is increased, and thedrainage uniformity and the drainage efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation treatment, in particular to a soft soil foundation treatment device and method. Background technique [0002] With the needs of social development, more and more soft soil will be used as building foundations. When soft soil is used as a foundation or for other purposes, it needs to be reinforced. Due to the properties of high water content, high void ratio and high flow plasticity of soft soil, drainage consolidation method is a commonly used foundation for such projects. The principle of treatment is to set up vertical drainage bodies such as sand wells or plastic drainage plates, so that the pore water in the soil layer is mainly discharged from the horizontal direction through the vertical drainage body, thereby increasing the drainage path of the soil layer and shortening the drainage distance. Under the action of load, the drainage and consolidation of the soil is accelerated, ...

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Problems solved by technology

[0004] However, in actual operation, the soft soil foundation treatment method in the above-mentioned patent still has certain deficiencies. First, the horizontal drainage channel formed by the jet aerosol in the soft soil is only a temporary drainage layer, which mainly relies on adding A certain amount of inorganic high-cation materials and corresponding amphiphilic polymer materials modify the silt in contact to form a micro-surface drainage system. The thickness of the horizontal drainage channel of this micro-surface drainage system is very small, and the horizontal Drainage channels are easily blocked due to uneven settlement in local areas of the soft soil layer, resulting in uneven drainage within a certain horizontal range and affecting the overall drainage efficiency; secondly, the soft soil foundation treatment method still needs to set more vertical drainage bodies at intervals , resulting in a waste of resources. In addition, the cost of aerosols with functional materials is relatively high, which increases the cost of soft soil foundation treatment

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