Method for processing ultra-soft soil through combining shallow-surface-layer intermittent strong water-pumping/draining with short-term air-curing

Abstract

The invention discloses a method for processing ultra-soft soil through combining shallow-surface-layer intermittent strong water-pumping / draining with short-term air-curing. The method comprises the following steps of: arranging horizontal water-pumping / draining pipe networks in a shallow-surface layer of an ultra-soft soil body, arranging water-draining pipe trenches in the surface layer and connecting the horizontal water-pumping / draining pipe networks and the water-draining pipe trenches with water-pumping / draining equipment so as to form a three-dimensional surface-layer water-pumping / draining system for shallow-surface-layer ultra-soft soil; carrying out intermittent strong water-pumping / draining and being aided with surface-layer drainage by using the water-pumping / draining equipment; and meanwhile, combining with the short-term air-curing by using the climate characteristics of strong sunlight and strong wind of coastal areas. According to the invention, the reinforcement for the shallow-surface-layer ultra-soft soil can be effectively and rapidly achieved, thus the invention provides a reinforcement treatment method which is applied to ultra-soft foundations, the shallow-surface layer of which is made of sludge or hydraulic-filled sludge and can greatly save cost.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, in particular to the technical field of reinforcing supersoft soil on the shallow surface of silt or dredged silt before soft foundation treatment. Background technique [0002] In recent years, with the large-scale development of land reclamation projects in coastal areas, the supply of sand resources has become increasingly tight, and the price has continued to rise, resulting in higher and higher construction costs. In view of this, a large amount of dredged silt from harbor basins and waterways is used as dredging fill material, and land sites are formed after hydraulic dredging. The recently dredged silt belongs to ultra-soft soil, and the shallow surface soil has a very high moisture content, which is in the form of floating mud or flowing mud, and its strength and bearing capacity are extremely low. If it is not dealt with, construction personnel and mechanical equipment will...

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Problems solved by technology

Although the cost of the natural drying method is less, the construction period is long, usually 1 to 2 years, and the thickness of the hard shell layer is very limited, and there is still flowing mud underneath; the geotextile reinforcement method is to lay geotextile , geogrid, wattle, penny grid and other materials, directly laying sand cushion and mechanical board on it, this method is prone to uneven reinforcement effect, low construction efficiency, high cost and uncontrollable, board risk However, the chemical solidification method and the replacement cushion method are not suitable for large-scale ultra-soft soil reinforcement in coastal areas due to their high cost.

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