Horizontal drainage consolidation method through blow filling of soft soil

Abstract

Disclosed is a horizontal drainage consolidation method through blow filling of soft soil. The horizontal drainage consolidation method includes that (1), in a blow filling area, zoning is performed according to width of 50-125m to form a plurality of zoning areas; (2), on two sides of the zoning areas, a plurality of longitudinally-arranged vertical pipes are arranged on a vertical plane, and the bottom ends of the vertical pipes on the two sides are communicated with longitudinal horizontal pipes respectively; (3), a plurality of flexible transverse drainage plates are arranged horizontally, and two ends of the flexible transverse drainage plates are communicated with longitudinal horizontal pipes on two sides respectively; (4), performing blow filling of the soft soil in the zoning areas to form a first layer; (5), longitudinal horizontal pipes are arranged on the first layer, after being subjected to blow filling of the soft soil, in each zoning area along the sideline of the zoning area, middle areas of the vertical pipes on the two sides are communicated with longitudinal horizontal pipes respectively, a plurality of flexible transverse drainage plates are horizontally arranged, two ends of the transverse drainage plates are communicated with the longitudinal horizontal pipes on the two sides respectively to form a second layer, and the transverse drainage plates among layers are parallel to one another; step (4) and step (5) are repeated and so on to form a plurality of layers; the layers are communicated with one another, and vacuumizing equipment is communicated with the vertical pipes for vacuumizing.

Description

technical field [0001] The invention relates to a consolidation method for horizontal drainage of dredged soft soil. Background technique [0002] In sand-deficient areas, the treatment method of dredger filling soft soil is the vacuum direct discharge surcharge preloading drainage consolidation method without sand cushion, and the pipeline is directly connected to vertically arranged plastic drainage boards as vacuum transmission and drainage channels, and the surface layer is laid After the geotechnical cushion and geomembrane are sealed, the silt or water layer is the upper surcharge. The basic principle is to use the combined effect of the additional stress of the upper load and the vacuum negative pressure to accelerate the drainage of the foundation soil to the drainage board, and then vertically upward through the drainage board. , thereby reducing the water content of the foundation soil and increasing the strength of the foundation. However, for the dredging fillin...

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Problems solved by technology

However, for the dredging filling foundation of remodeling soft clay with high moisture content (>80%) and high plasticity index (>20), due to poor soil structure, high clay content, high moisture content, and compressibility High, low strength, low permeability, etc., there are problems such as poor drainage and consolidation effect, long and uneven treatment time, low reliability of foundation strength, etc. Therefore, generally, the dredged fill should be dried for several months Even after a few years of processing, the effect will be better

For new dredger-filled soft clay, during the straight-drain vacuum loading process, a 20-30cm thick dense layer and soil column bulges are often formed on the soil surface and around the drainage board, forming a drainage partition, and the drainage and vacuum transmission outside the dense layer are relatively slow. Normal soil is more difficult. As a result, only a small part of the foundation soil centered on the drainage board is actually reinforced, and the other parts have basically no reinforcement effect

At the same time, because the vacuuming of soft soil with high water content is concentrated on the surface layer or the drainage board, the drainage board is filled with more water bodies, resulting in poor vacuum transfer effect to the depth, and the treatment effect of the soil below 1m in the shallow layer is difficult to reach the theoretical level. effect, high energy consumption, low efficiency

This method will also cause the drain board to deform and twist, hindering drainage

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