Multi-pressurized rapid consolidation compact soft soil foundation treatment method

Abstract

The invention belongs to the technical field of soft soil foundation treatment in geotechnical engineering, and in particular relates to a method for treating soft soil foundation along rivers, rivers and lakes. Combining vacuum drainage, vibration pressurized compaction and dynamic tamping pressurized compaction, first of all, the high dynamic head rate produced by the superposition of the excess pore water positive pressure excited by the vibration and the vacuum negative pressure is used in a short period of time. Drain the water in the soil within a short time to quickly reduce the water content of the soil and compact the soil to a certain extent; then carry out dynamic compaction to further increase the excess pore water pressure to form a higher dynamic head gradient to drain and compact the soil. Repeatedly for many times to eliminate the post-construction settlement of the deep soft soil to the greatest extent, improve the surface consolidation, strength and stiffness, until the design requirements are met. Compared with the existing method, the method of the invention has the characteristics of short construction period, low cost, small post-construction settlement, good consolidation and compaction effect, etc., and can be widely used in the treatment of soft soil foundations of various projects in coastal areas, along rivers and other areas.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment in geotechnical engineering, and in particular relates to a method for treating soft soil foundation along rivers, rivers and lakes. Background technique [0002] (1) Soft ground treatment has broad application prospects [0003] With the reduction of available land in cities and the enhancement of people's awareness of environmental protection, in recent years people have increased the number of soft foundation projects along the coast, rivers and rivers (for example: Qingdao Hercy Bay Beihai Shipyard, Shenzhen Airport Expansion, Shanghai Nanhui District Lingang New City, Shanghai Changxing Island Shipbuilding Base, Tangshan Caofeidian Shougang Relocation Project, etc. are all constructed on soft foundations). Most soft soils usually have high water content, high compressibility, and poor permeability, so they must be treated to meet the requirements of use. From the persp...

AI Technical Summary

Problems solved by technology

The surcharge preloading method refers to temporarily filling soil and rocks on the site, loading preload on the foundation treatment, so that the foundation settlement can be completed in advance, and the foundation bearing capacity is improved through foundation soil consolidation, and the preload is removed after reaching the requirements This method has three deficiencies: first, it requires a large amount of earth and rocks nearby, and the cost is relatively high; second, if the piled-up height is too high, it will cause slope stability problems; and third, the construction period is relatively long.

The advantage of this method is that the construction period is short and the strength is significantly improved, but it is generally only suitable for non-cohesive soil, miscellaneous fill soil, unsaturated cohesive soil, etc., and it is not suitable for soft soil with high water content and extremely low strength.

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