Collapsibility soil or thaw collapsibility soil foundation treatment method

Abstract

The invention relates to a collapsibility soil or thaw collapsibility soil foundation treatment method. Firstly, a water injection hole is formed in a foundation, after the water injection hole is formed, water is injected into the water injection hole, accordingly, collapsibility or thaw collapsibility of foundation soil is eliminated in a water injection manner, and the diameter of the water injection hole ranges from 380 mm to 2,000 mm; and secondly, after water injection is finished, pile foundation or foundation treatment is conducted on the foundation, and accordingly, the construction building foundation bearing capacity design requirement is met. Through the collapsibility soil or thaw collapsibility soil foundation treatment method, the construction period can be shortened, and the engineering quality is guaranteed.

Description

technical field [0001] The invention relates to the field of foundation engineering, in particular to a treatment method for collapsible soil or dissolved soil foundation. Background technique [0002] In the processing method of existing collapsible soil or submerged soil foundation, there is the pre-soaking method, which is to form a larger soaking pit on the foundation, directly inject water into the soaking pit, and after a long time of a large amount of water immersion (generally at least More than 60 days) to eliminate the collapsibility or subsidence of deep soil. This method of immersion requires a lot of water, and the water injection time is very long, and the amount of water lost due to large-scale water evaporation during construction is also large. At the same time, this The first method is to immerse the surface of the foundation soil, whether it can better eliminate the collapsibility or dissolution of the deep soil is not guaranteed. [0003] In addition, fo...

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Problems solved by technology

[0002] In the processing method of existing collapsible soil or submerged soil foundation, there is the pre-soaking method, which is to form a larger soaking pit on the foundation, directly inject water into the soaking pit, and after a long time of a large amount of water immersion (generally at least More than 60 days) to eliminate the collapsibility or subsidence of deep soil. This method of immersion requires a lot of water, and the water injection time is very long, and the amount of water lost due to large-scale water evaporation during construction is also large. At the same time, this The first method is to soak the surface of the foundation soil, whether it can better eliminate the collapsibility or dissolution of the deep soil is not guaranteed.

[0003] In addition, for the subsidence soil foundation, it is not only required to eliminate the subsidence of the soil, but also due to the different salts contained in the subsidence soil, which have different degrees of corrosion to various materials, when choosing a treatment method, it is also necessary to It is necessary to choose materials to avoid corrosion, and the processing is difficult, especially when the thickness of the soil layer to be processed is large, which further increases the difficulty of construction and the quality of the project is difficult to guarantee

[0004] In the prior art, small holes of 70 mm to 150 mm are also used in the foundation, and filter materials such as medium and coarse sand are backfilled into the small holes, or directly soaked in water in the small holes without filling filter materials. A large number of dense water injection holes are formed, after a long period of continuous water injection, and when the filter material is not filled, it is very easy to fail to achieve the treatment effect due to the problem of hole collapse. This method also has a long construction period and high construction costs.

[0005] In the existing treatment methods for collapsible soil or subsidence soil foundation, a single pile foundation or foundation treatment method is used on the construction site, which is difficult to meet the requirements of eliminating the collapsibility or subsidence of the foundation soil and improving the foundation of buildings and structures at the same time. Bearing capacity requirements, especially when the thickness of the soil layer is large and the foundation soil has strong collapsibility or dissolution, it is more difficult to deal with, and it is difficult to guarantee the quality of the project, which cannot meet the design requirements of the foundation of buildings and structures