Soft soil roadbed processing method for hardening soil bodies to form composite foundation

Abstract

The invention discloses a soft soil roadbed processing method for hardening soil bodies to form a composite foundation, and belongs to the field of soft soil foundation treatment. According to the soft soil roadbed processing method, hollow prefabricated hole-reserving pipe piles are adopted, part of pore water in the pile peripheries flows into the hollow pipe piles when the pipe piles are driven, therefore, the partial soil squeezing effect can be reduced, and the super-pore water pressure can be reduced; high-pressure rotary spraying gas jetting is adopted in the hollow prefabricated hole-reserving pipe piles, the high-pressure gas is laterally diffused to the surrounding soil bodies through reserved holes of the hollow prefabricated pipe piles to form horizontal channels to acceleratedrainage consolidation, then the water is pumped, so that the problem that in the field practical drainage process, soil particles can enter the transverse holes of the prefabricated pipe piles to block a preset drainage path is solved; then a machine is adopted to roll the soil bodies so as to accelerate the drainage of the soil bodies on the peripheries of the piles, and then pumping water is carried out again; and finally the composite foundation is formed, and the characteristics of rapid treatment of a soft soil road bed, rapid construction and rapid transport service, improvement on bearing, and control of the roadbed settlement after construction are achieved.

Description

technical field [0001] The invention relates to the field of soft soil foundation treatment, in particular to a soft soil subgrade treatment structure and a method for forming a composite foundation through hardening of soil. Background technique [0002] Heap loading or vacuum preloading drainage consolidation method is a relatively economical soft soil foundation treatment method, but it has great limitations. Mainly manifested in: (1) the existing technology is a deep treatment technology from the surface to the underground, and the economic treatment depth is generally not more than 10m; (2) the treatment time is long; (3) the follow-up soil is still creeping for a long time, and the foundation The bearing capacity is limited, and the post-construction settlement is relatively large. [0003] When the prefabricated pipe pile is driven into the soil, there are problems such as obvious soil squeezing effect and large excess static pore water pressure. For this reason, ma...

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Problems solved by technology

[0008] On the basis of the existing technology, the present invention combines the characteristics of the soft soil roadbed, no longer adopts the surcharge or vacuum preloading drainage consolidation method in the traditional sense, but uses the hollow prefabricated pipe pile with holes, and when the pipe pile is driven into Part of the pore water around the pile flows into the hollow pipe pile, which can not only reduce the partial soil squeezing effect, but also reduce the excess pore water pressure; the high-pressure jet jet is used in the hollow prefabricated perforated pipe pile, just like the sea thermal vortex wind wave, high pressure The gas spreads laterally through the holes of the hollow prefabricated pipe piles to the surrounding soil to form a horizontal channel to accelerate drainage and consolidation, and then pumps water, which solves the problem that soil particles will enter the horizontal holes of the prefabricated pipe piles and block the preset drainage path during the actual drainage process on site. Problem: Then use mechanical rolling to compact the soil, accelerate the drainage of the soil around the pile, and then pump water again, and finally form a composite foundation, which is in line with the characteristics of rapid treatment of soft soil roadbed, rapid construction and opening to traffic, increasing bearing capacity, and controlling post-construction settlement of the roadbed

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