What principles should be followed when choosing a foundation treatment method?

The principle of foundation treatment design is "to adapt to local conditions, use local materials, protect the environment and conserve resources". This is stipulated in the general provisions of JGJ79-2012 "Technical Specification for Foundation Treatment", and the following figure is for reference.

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The design of foundation treatment should follow the following principles:

1. Must have sufficient information.

It includes two geological data and information on the superstructure.

1) Geological data.

Geological data include the mechanical properties of each layer of soil, the spatial (including vertical and horizontal) distribution of soil layers, and the flow law of groundwater.

In the analysis of geological data, special attention should be paid to the origin of soil quality and the influence of regional characteristics on the mechanical properties of soil, and the influence of soil particularity on the proposed building should be paid attention to special soils, such as newly sedimentary soil, collapsible soil, liquefied soil, etc.

2) Superstructure data.

Each type of structure has different ability to adapt to settlement and allowable deformation value, and these structural factors must be considered when selecting a foundation treatment solution. The complexity of the building will also have different requirements for foundation treatment, for example, for buildings with simple body shape and good overall structural rigidity, the settlement of the building is mainly controlled; For buildings with integrated main podiums, the impact of differential settlement must be taken into account in the foundation treatment plan.

2. Technical rationality.

The rationality of the foundation treatment technical scheme is to adopt reasonable reinforcement measures according to the requirements of different buildings for bearing capacity and deformation, according to the soil conditions that need to be treated, so as to meet the functional requirements of the building.

The rationality of the foundation treatment technical scheme should take into account the geological conditions, the use function of the building, the type of structure, the load distribution, the hazards that may be caused by uneven settlement, and groundwater and other factors, and carry out a comprehensive analysis.

3. Technical feasibility of construction.

The technical feasibility of the construction, including the pertinence of the construction plan and the selection of equipment to change the mechanical properties of the soil and the degree to which the environmental conditions are allowed. The foundation treatment scheme to improve the bearing capacity of the foundation can choose the composite foundation scheme with different solidifications, and the foundation treatment scheme to eliminate sand liquefaction can choose the foundation treatment methods such as strong compaction and vibroflotation.

At the same time, the selected foundation treatment scheme should be carried out under the conditions that the surrounding environment allows, such as the strong compaction method can not be used in the dense area of underground pipelines, and the vibrating immersed pipe construction method cannot be selected in the populated residential area.

4. Economy.

The economics of any foundation treatment solution should be taken into account. The economics of the foundation treatment scheme are integrated into the technical rationality and construction technical feasibility. That is to say, under the premise of satisfying the technical rationality and construction feasibility, the economy of the foundation treatment scheme is very important.

5. It is necessary to have the concept of superstructure-foundation-foundation interaction.

With the increase of the height of the building, the increase of the depth of the underground structure, and the emergence of the integrated structure of the main group of buildings and the building form of large chassis and multi-tower, the determination of the foundation treatment scheme should not only focus on improving the bearing capacity of the foundation, eliminating liquefaction, eliminating collapsibility, reducing deformation, etc., but also use the concept of superstructure-foundation-foundation joint action to evaluate the effect of the superstructure load on the foundation, and reasonably select the foundation treatment scheme.

The principle of foundation treatment design is "to adapt to local conditions, use local materials, protect the environment and conserve resources".

See JGJ79-2012 "Technical Specification for Foundation Treatment" for general provisions, the following figure is for reference.

Hope it helps.

Ground treatment is affected by the superstructure, foundation conditions, environmental impact and construction conditions, equipment condition and economic indicators.

1.The bearing layer of the building foundation under the soil change cushion method is relatively weak, and can not meet the upper load of the foundation to funnel time, if this kind of foundation is shallow foundation treatment or soft cohesive soil foundation, the soil change cushion method is often used to deal with the weak foundation. The soil cushion method is to first dig out the weak soil layer within a certain range below the bottom surface of the foundation, and then backfill the materials with high strength, low compressibility, and no corrosive properties, such as medium coarse sand, gravel or pebbles, ash, plain soil, stone chips, slag, etc., and then use it as the bearing layer of the foundation after layering and tamping.

The advantage of the soil cushion method is that the construction is simple, it is convenient to take materials on the spot, reduce the cost, and the soil cushion can be divided into ash cushion, sand cushion, crushed (sand) stone cushion and so on according to the material of its backfill. Ash cushion. The ash cushion is to dig out the weak soil layer within a certain fan pin under the bottom surface of the foundation, and use it according to a certain volume ratio with commonly used 3 limes:

7. After the quicklime and cohesive soil of clay are mixed evenly, they are formed by layered backfill tamping or compacting under the condition of optimal water content. It is suitable for the reinforcement of general cohesive soil foundation with low groundwater level and foundation groove often in a relatively dry state.

Summary. Dear, hello, I have inquired for you what method is usually used for foundation treatment 1, replacement filling method, in a certain range of the soil layer of the foundation hollowed out, and then in the hollowed out position filled with more strength sand, soil, gravel and so on. 2. Preloading method, before building a house, first apply or apply a load equivalent to the foundation on the construction site or grading, so that the water in the void of the foundation soil layer is squeezed out and the foundation soil layer becomes more compact.

3. The strong compaction method is to drop the hammer from a high place on the foundation, and continuously carry out strong tamping on the ground. 4. Vibroflotation method, using the vibrator to continuously add water and vibration in the foundation, so that the soil void becomes smaller. 5. Deep mixing method, using special mixing machinery to strongly stir the cement and soil in the foundation, so that the foundation forms a whole.

6. The sand and gravel pile method uses a vibrating machine to continuously vibrate in the foundation, and then drives the casing into a predetermined depth, discharges the sand and gravel in the soil, and allows the vibrating machine to squeeze the sand and soil until the pile is formed. 7. Soil or ash compacted pile method, using immersed pipe, impact or blasting and other methods to carry out strong impact in the foundation, so that the soil forms a hole, and then fills the hole with plain soil or ash until the soil is piled.

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Dear, hello, I have inquired for you what method is usually used for foundation treatment 1, replacement filling method, in a certain range of the soil layer of the foundation hollowed out, and then in the hollowed out position filled with more strength sand, soil, gravel and so on. 2. Preloading method, before building a house, first apply or apply a load equivalent to the foundation on the construction site, so that the water in the gap of the foundation soil layer is squeezed out, so that the foundation soil layer becomes more compact. 3. The strong compaction method is to drop the hammer from a high place on the foundation, and continuously carry out strong tamping on the ground.

4. Vibroflotation method, using the vibrator to continuously add water and vibration in the foundation, so that the soil void becomes smaller. 5. Deep mixing method, using special mixing machinery to strongly stir the cement and soil in the foundation, so that the foundation forms a whole. 6. The sand and gravel pile method uses a vibrating machine to continuously vibrate in the foundation, and then drives the casing into a predetermined depth, and discharges the sand and gravel in the soil.

7. Soil or ash compacted pile method, using immersed pipe, impact or blasting and other methods to carry out strong impact in the foundation, so that the soil forms a hole, and then fills the hole with plain soil or ash until the soil is piled.

What is the specific content of the principles that should be complied with in the treatment of <> foundation, and the following Zhongda Consulting will answer for you.

1. The foundation treatment should be based on the requirements of the hydraulic building for the foundation, carefully analyze the hydrological, geological and other conditions, make technical and economic comparisons, and select the construction plan that is technically feasible, reliable, short and economical.

2. In addition to meeting the layout of the grouting system and grouting equipment, the area of the curtain grouting construction site should also consider the need to strengthen the grouting if necessary. Qualified engineering curtain grouting should be carried out in the corridor.

3. The consolidation grouting of the dam foundation with covered weight should be carried out after the concrete reaches the required strength.

4. The foundation grouting should be carried out in the order of consolidation first and then curtain. Curtain grouting should be constructed in a sequential and gradual encryption manner.

5. The elevation of the anti-seepage wall construction platform should be 2m or more higher than the design maximum water level during the construction period. The plane size of the platform should meet the requirements of hole making, slag removal, concrete ballast spike pouring and traffic. Travel.

6. The length of the slot hole of the impermeable wall should be determined by comprehensive analysis of the formation characteristics, the depth of the slot, the performance of the hole-making machine, the construction period requirements and the concrete production capacity, which can be 5m 8mSmall values should be taken for deep groove sections and groove wall collapse sections.

7. The quality and quantity of the soil used in the construction of the anti-seepage wall should meet the requirements of hole making and hole cleaning, the clay content of the pulping soil should be more than 50%, the plasticity index should not be less than 20, and the sand content should be less than 5%.

8. The construction plan of thin-walled concrete seepage wall should be selected after technical and economic comparison according to the comprehensive factors such as the seepage prevention requirements of hydraulic buildings, geological conditions, construction equipment peibu, technology, materials and construction period.