Air impacting drainage and double-faced vacuum preloading consolidation method of deep soft soil foundation

Abstract

The invention belongs to the technical field of foundation treatment in geotechnical engineering, and relates to a deep soft soil foundation consolidation method, in particular to an air impacting drainage and double-faced vacuum preloading consolidation method of a deep soft soil foundation. The air impacting drainage and double-faced vacuum preloading consolidation method has the advantages that the traditional drainage board is replaced by an air impacting drainage body formed by assembling and connecting the drainage board, a multifunctional pipeline, a hand type joint and a communication joint, and in an early consolidation stage, a multifunctional pipeline system is connected with a vacuum device to form a vacuum pumping system, and an upper vacuum working face and a lower vacuum working face jointly act, so that double-faced vacuum drainage consolidation is realized, the effective consolidation depth is increased, drainage consolidation is accelerated, and a construction period is shortened; in a later consolidation stage, the multifunctional pipeline system is connected with a supercharging device to form an air impacting drainage system, so that the drainability can be improved quickly and the clogging effect of the drainage board can be alleviated effectively; the problems that the effective consolidation depth is low, the drainability is limited and the clogging effect occurs when the traditional vacuum preloading technology is adopted to treat the deep soft soil foundation are solved; the overall consolidation effect of the deep soft soil foundation is ensured; and the air impacting drainage and double-faced vacuum preloading consolidation method is simple, reliable, economical and practical.

Description

technical field [0001] The invention relates to a method for strengthening deep soft soil foundations, in particular to a method for strengthening deep soft soil foundations by means of double-sided vacuum preloading by air flushing and drainage, and belongs to the technical field of geotechnical engineering foundation treatment. Background technique [0002] In my country's coastal and inland areas, marine, lacustrine, and river sedimentary soft foundations are widely distributed, in addition to the soft foundations formed by reclamation of seas and land reclamation. With the rapid development of my country's infrastructure construction, there are more and more engineering projects such as roads, railways, bridges, water conservancy, houses, airports, ports and ports built on soft soil foundations, especially in coastal and inland rivers and lakes. We often face the problem of weak foundation reinforcement treatment. The vacuum preloading method has unique advantages in dea...

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Problems solved by technology

[0003] However, when this technology is applied to deep soft soil foundations, the following problems will occur: 1) As the vacuum negative pressure is transmitted along the drainage body to the depth of the soft foundation, there will be obvious loss along the way, and the depth of vacuum transmission is limited, resulting in the weakness of the deep part. The reinforcement effect of the soil layer is poor; 2) For ultra-soft soil foundations, especially dredging soft foundations, drainage boards often silt up, resulting in unsatisfactory overall reinforcement effects for deep and thick soft soil foundations; 3) The technical drainage capacity is limited. The drainage effect in the later period is obviously worse, and at this time, there is still a large amount of water in the drainage system that has not been discharged, which affects the effect of foundation reinforcement

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