foundation subsidence reinforcement project is a foundation with low bearing capacity and poor stability. This paper will introduce the foundation subsidence reinforcement project and discuss the potential hazards it may bring, such as building subsidence, structural damage and safety hazards. To help readers gain a more comprehensive understanding of the foundation subsidence reinforcement project and its impact.

1. Types and characteristics of soft soil foundation

foundation subsidence reinforcement project is a foundation mainly composed of silt, silty soil, wash fill, miscellaneous fill or other high compressibility soil layers. The natural water content of the foundation is too large, the bearing capacity is low, and the sliding or consolidation settlement is easy to occur under the action of load.

1. Silt and silty soil

Saturated clay deposited in clean water or slow flow environment, formed by biochemical processes, with high natural water content, low bearing capacity (shear strength), soft plastic to fluid plastic state. Its water content is generally greater than the liquid limit (40%~90%); The natural pore ratio is generally greater than or equal to 1.0; When the soil is formed by biochemical processes and contains organic matter, its natural pore ratio is greater than 1.5. When the natural pore ratio is less than 1.5 and greater than 1.0, it is called silty soil. Silt and silty soil are collectively referred to as soft (sticky) soil in engineering, and are the main types of soft soil foundation. It is mostly distributed in coastal, middle and lower reaches of rivers or near lakes.

Engineering characteristics: thixotropy, high compressibility, low permeability, inhomogeneity and rheology.

2. Flushing and filling

It is a fill formed by the deposit of hydraulic filling sediment. Common in coastal areas and river banks. The characteristics of scour fill are related to its particle composition. This kind of soil has large water content, high compressibility, low strength and soft soil properties.

Engineering characteristics vary with soil particle composition, uniformity and drainage consolidation conditions. When the clay particle content is large, it is often underconsolidated, and its strength and compressibility indexes are worse than those of natural sedimentary soil, so foundation treatment should be carried out.

3. Miscellaneous fill

It contains a large amount of construction waste, industrial waste and domestic waste. Common in some older cities and industrial and mining areas.

Engineering characteristics: the soil structure is relatively loose, poor uniformity, large deformation, low bearing capacity, high compressibility, water immersion collapsibility.

4. Collapsible loess

Collapsible loess refers to the soil with significant additional deformation due to the structural damage of soil after immersion under the action of gravity stress of overlying soil or under the combined action of gravity stress and additional stress. It is a special soil. Some miscellaneous fills also have collapsibility. Loess widely distributed in northeast, northwest, central and East China has collapsibility. The loess mentioned here generally refers to loess and loess-like soil. Collapsible loess can be divided into self-weight collapsible loess and non-self-weight collapsible loess, and some old loess does not have collapsibility).

Engineering characteristics: the soil quality is relatively uniform, the structure is loose, and the pores are developed. When it is not soaked by water, the strength is generally higher and the compressibility is small. When the soil is soaked by water under a certain pressure, the structure of the soil will be rapidly destroyed, resulting in a large additional subsidence, and the strength will be rapidly reduced.

5, other high compressibility soil

Saturated loose silty fine sand (with some silty clay) is also part of the foundation subsidence reinforcement project. The poor foundation phenomena of other special soils, such as expansive soil, saline soil, red clay and seasonal frozen soil, also belong to the category of foundation subsidence reinforcement projects requiring foundation treatment.

2. Impact and potential harm

1, building settlement: the inner wall of the foundation pit due to poor shear resistance, easily lead to displacement, further cause building collapse

And the surrounding buildings crack and displacement and other problems.

2. Structural damage: excessive settlement of foundation soil will cause negative friction of pile, resulting in damage of pile foundation or superstructure.

3, security risks, potential hazards: due to the large settlement of soft ground foundation, it will make the ground project lack of smooth, affecting the safety of personnel, and will also lead to the loss of the integrity of the corresponding ground due to the huge difference in settlement.

Iii. Treatment plan for foundation subsidence reinforcement project

foundation subsidence reinforcement project treatment is related to the quality of the whole project. Reasonable foundation treatment can reduce and eliminate the adverse effects of foundation subsidence reinforcement project on the superstructure. Hengxiang Hongye non-destructive and controllable soil solidification technology is suitable for the treatment of silt, silt, clay, silt and other different geological foundations, using miniaturized equipment, microporous treatment, non-destructive and controllable, does not affect production and life, improve soil properties, fast and accurate consolidation of soil, and efficiently solve the problem of building settlement caused by insufficient bearing capacity of soft soil foundation.

In order to prevent excessive settlement of building foundation from posing a safety threat, foundation treatment measures should be taken in time. It is necessary to improve the engineering properties of foundation soil to meet the requirements of building on foundation stability and deformation, including improving the deformation characteristics and permeability of foundation soil, improving its shear strength and anti-liquefaction ability, and eliminating other adverse effects.

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