Drainage consolidation method for hydraulic filling soft clay reinforcement

Abstract

The invention relates to a drainage consolidation method for hydraulic filling soft clay reinforcement. The method includes: performing operation area division on a construction foundation pit; erecting drainage curtain walls and collecting wells at the edges of an operation area; hydraulically filling the operation area with soft clay; horizontally paving flexible drainage plates; performing hydraulically filling of the soft clay and pavement of the flexible drainage plates again till specified elevation is reached; arranging sand cushions at the tops of the drainage curtain walls, burying a vacuum pipe network, connecting vacuum jet pumps, and then paving sealing films for closing; turning on the vacuum jet pumps for vacuum pumping, and stopping the vacuum jet pumps when specified end conditions are reached. By the aid of the characteristics of layer-by-layer hydraulic filling of the soft clay for step-by-stay rising and layer-by-layer arrangement of the horizontal drainage plates, drainage is performed by the aid of geostatic stress of the hydraulic filling soft clay, energy consumption is lowered greatly, the construction period becomes an effective drainage period, formation of a soil mass structure is quickened, total construction period is shortened, a large quantity of materials are saved, formation of a shallow layer and compact layers surrounding the drainage plates can be prevented, excellence of the soil mass structure is guaranteed, and soil mass drainage capacity is improved.

Description

technical field [0001] The invention relates to a method for reinforcement treatment of clay, in particular to a drainage consolidation method for dredging soft clay reinforcement treatment which uses self-weight stress and vacuum negative pressure as power to accelerate drainage. Background technique [0002] In the prior art, the drainage consolidation treatment methods for dredging soft soil generally include using plastic drainage boards as vertical drainage channels, top packing and applying vacuum as the driving force for drainage. In sand-deficient areas, a sand-free cushion layer vacuum straight discharge surcharge preloading drainage consolidation method has been invented for dredging soft soil, which is currently more popular. After decades of application practice, these methods have made many improvements in technology, equipment, materials and other aspects. The surcharge preloading method mainly uses the extra load applied above the top to drive the drainage an...

AI Technical Summary

Problems solved by technology

In addition, according to the engineering practice, during the direct-drainage vacuum loading process of the recently dredged soft clay, a 20-30cm thick dense layer and soil column bulges are often formed on the soil surface and around the drainage board, resulting in drainage isolation and compactness. Drainage and vacuum transmission outside the layer are more difficult than normal soil. As a result, only a small part of the foundation soil centered on the drainage board is actually reinforced, and the other parts are basically not reinforced.

At the same time, due to the vacuuming of the soft soil with high water content concentrated on the surface layer or the top of the drainage board, the deformation of the foundation will cause the drainage board to bend and twist, a dense layer will be formed around the drainage board to block, and more water will be filled, causing the vacuum to go down and the drainage board The surrounding transfer effect is very poor, and due to the barrier of the soil column formed around the drainage board, it is difficult to achieve the theoretical effect of the previous soil treatment effect with a shallow layer below 1m and a radius of 20cm centered on the drainage board, resulting in high energy consumption and low efficiency

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