Blow fill foundation treating method and gas injection draining method therefor

Abstract

The invention relates to a processing method about blow-filled foundation, comprising that: a blast-filled ground is leveled, a longitudinal slope is arranged in one direction; blind drains are arranged along the direction of the longitudinal slope; a sand water conveyance cushion layer is paved, a gas injection pipe is buried at the middle position between the blind drains; the blow fill is blast-filled on the sand cushion layer, when the thickness of the blow fill is above 50cm, the gas supplying device is started, the gas is injected into the sand water conveyance cushion layer by the gas injection pipe, gas injection and blast-filling are carried out simultaneously, and the water flowing out from the blind drains is cleaned at the same time; when the thickness of the blow fill is half of the designed monolayer thickness, gas injection pipes are paved on the blow fill, then the blow fill is blast-filled continuously until the thickness of the blow fill reaches monolayer thickness, and gas is injected into the blow fill layer; the above steps are repeated until the thickness of the blow fill reaches the total height; after blast-filling, each layer of gas injection pipes continuously inject gas until the blind drains have no water flowing out. The effect is better if combining with surcharge preloading. The processing method about blow-filled foundation has the advantages of easy implementation, blast-filling and simultaneously injecting gas to drainage, greatly shortening the build-up time of the foundation strength, in favor of the after-maintenance of the foundation strength.

Description

technical field [0001] The invention relates to a hydraulic fill foundation treatment technology, in particular to an air injection drainage device for soil consolidation, and belongs to the technical field of weak foundation treatment. Background technique [0002] With the vigorous development of the economy and infrastructure of cities along the coast and along the river, as well as further urban development planning, some domestic ports have insufficient land use, and the dredged silt is used for land reclamation or construction of land for docks and ports. This has become an important means of land development. For example, Shanghai, as a typical soft soil foundation area, is also in the new round of urban master planning period of Shanghai. By 2020, the urbanization level will reach 85%, and the total construction land will be 1500km 2 , the Yangtze River and the coast of the East China Sea will become important industrial development belts, so the tight land use larg...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of difficult drainage of dredged fill and long time for foundation treatment, the present invention provides a foundation treatment method for dredged fill that can accelerate the drainage and consolidation of the foundation and shorten the time for foundation strength growth on the basis of proposing the gas injection drainage method

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