Vacuum preloading shallow layer solidification method based on new dredger-filled ultra-soft soil foundation

Abstract

The invention relates to a vacuum preloading shallow-layer solidification device based on a newly-reclaimed ultra-soft soil foundation. The vacuum preloading shallow-layer solidification device is characterized by comprising a first woven fabric layer, a second vitex-fence layer, a third non-woven fabric layer, a plurality of sets of drainage plates, a drainage filtering pipe, a fourth geogrid layer, a fifth non-woven fabric layer and two layers of sealing films, wherein the first woven fabric layer, the second vitex-fence layer, the third non-woven fabric layer, the drainage plates, the drainage filtering pipe, the fourth geogrid layer, the fifth non-woven fabric layer and the two layers of sealing films are laid on the upper surface of the newly-reclaimed ultra-soft soil foundation in sequence, a sealed cavity is defined by the sealing films and the newly-reclaimed ultra-soft soil foundation in an enclosed mode; the outside of the sealed cavity is connected with a vacuumizing device. A method for conducting vacuum preloading shallow-layer solidification on the newly-reclaimed ultra-soft soil foundation through the shallow-layer solidification device comprises the following steps that (1) the vacuum solidification device is arranged on the newly-reclaimed ultra-soft soil foundation; (2) vacuumizing is carried out for a certain period of time, so that shallow-layer soil obtains definite bearing capacity rapidly. From the fundamental starting point that a silt reclamation force-holding work cushion layer is omitted, shallow-layer reinforcing technology is innovated so that construction of hitting and installing of a plastic drainage plate on a deep layer in a vacuum preloading mode can be satisfied without the need of silt reclamation after shallow-layer reinforcing is carried out.

Description

technical field [0001] The invention belongs to the technical field of ultra-soft soil foundation reinforcement, in particular to a vacuum preloading shallow-layer solidification method based on newly blow-filled ultra-soft soil foundation. Background technique [0002] With the rapid economic development of my country's coastal areas, land resources are becoming more and more tense, and foundation reinforcement after land reclamation with dredged soil from harbor basins and waterways has become the main means to alleviate the shortage of land resources. Since the newly dredged soil is mostly silt, its water content exceeds 100%, its void ratio is greater than 2.0, and its appearance is like floating mud or flowing mud. It has not yet formed a strong soil skeleton structure, and its bearing capacity is almost zero. Faced with such an ultra-soft soil foundation, the vacuum preloading method is mainly used for reinforcement at present. In the construction process of vacuum pr...

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Problems solved by technology

[0006] Both method 2 and method 3 need to fill a certain thickness of silt cushion to meet the requirements of the slab construction work cushion. However, due to the excessive mining and use of silt in recent years, the current silt resources are becoming more and more scarce. , and the construction of dredging silt sand is greatly affected by the weather, and it often takes a long time to complete, which will inevitably make it difficult to guarantee the project cost and construction period

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