VINHOME GOLDEN RIVER

VINHOME GOLDEN RIVER

01/12/2020

VINHOME GOLDEN RIVER

Work: Design and construction of underground water pumping wells
Place: Nguyen Huu Canh, District 1, HCMC
Investor: VINCOM GROUP

When constructing foundation pits and foundations , it is often necessary to dig the ground below the groundwater level, especially for high-rise buildings, the foundation is very deep, the number of underground floors is quite large. During construction, if groundwater seeps into the foundation pit, causing the foundation pit to be flooded, it will lower the strength of the ground soil, increase the compressibility, and the building will settle too much, or increase the weight stress. the soil itself, causing additional settlement of the foundation, which will directly affect the safety of the construction. Therefore, when constructing the foundation pit, it is necessary to take measures to lower the water level and actively drain water so that the foundation is constructed in a dry state.

When applying water lowering and drainage measures, the following factors must be taken into account:

(1) Soil type and permeability coefficient.

(2) The core requires lowering the water level and the groundwater level, usually the groundwater level must be lowered to the bottom of the foundation pit 0.5 - 1.0m.

(3) Use any form to keep the foundation pit wall, especially the deep foundation pit.

(4) Large or small foundation pit area

Currently, there are two types of measures to lower the groundwater level: one is to lower the water on the surface, the other is to lower the water by wellpoint. The name of the method of lowering the water level and the scope of application is shown in Table 9.1.

Name

Appropriate conditions

Surface drainage

 

Light point well

 

 

Spray point welliếng

 

Pipe point well

 

 

Deep point well

 

Permeation point well

 

 

Permeable point well

Crushed rock, coarse sand, soil with small water permeability.

Powdered sand, clay powder, permeability coefficient 0.1-5m/day, relatively high groundwater level, point well with a depth of 3-6m; second grade point well, the depth of lowering the water level is 6 - 9m; multiple levels up to 12m.

The sandy soil has a permeability coefficient of 0.1 - 50 m/day, the excavation depth is greater than 6m, the water depth of the well can be up to 20m or more.

The coarse sand and gravel layer of the aquifer is relatively coarse, the permeability coefficient is relatively large, the water volume is quite large, the water depth is from 3 to 15m.

The permeability coefficient is quite large, the amount of groundwater is high.

Above the soil there is an upper layer of standing water or aquifer and below it is an aquifer that does not contain water, or a relatively stable immersion or pressurized aquifer.

Saturated clay soil, especially silt or silty soil, has a very small permeability coefficient, less than 0.1 m/day.

When constructing foundation pits and foundation works, it is often necessary to dig soil below the groundwater level, especially for high-rise buildings, the foundation is very deep, the number of underground floors is quite large. During construction, if groundwater seeps into the foundation pit, causing the foundation pit to be flooded, it will lower the strength of the ground soil, increase the compressibility, and the building will settle too much, or increase the weight stress. the soil itself, causing additional settlement of the foundation, which will directly affect the safety of the construction. Therefore, when constructing the foundation pit, it is necessary to take measures to lower the water level and actively drain water so that the foundation is constructed in a dry state.

When applying water lowering and drainage measures, the following factors must be taken into account:

(1) Soil type and permeability coefficient.

(2) The core requires lowering the water level and the groundwater level, usually the groundwater level must be lowered to the bottom of the foundation pit 0.5 - 1.0m.

(3) Use any form to keep the foundation pit wall, especially the deep foundation pit.

(4) Large or small foundation pit area

Currently, there are two types of measures to lower the groundwater level: one is to lower the water on the surface, the other is to lower the water by wellpoint. The name of the method of lowering the water level and the scope of application is shown in Table 9.1.

Name

Appropriate conditions

Surface drainage

 

Light point well

 

 

Spray point welliếng

 

Pipe point well

 

 

Deep point well

 

Permeation point well

 

 

Permeable point well

Crushed rock, coarse sand, soil with small water permeability.

Powdered sand, clay powder, permeability coefficient 0.1-5m/day, relatively high groundwater level, point well with a depth of 3-6m; second-grade point well, the depth of lowering the water level is 6 - 9m; multiple levels up to 12m.

The sandy soil has a permeability coefficient of 0.1 - 50 m/day, the excavation depth is greater than 6m, the water depth of the well can be up to 20m or more.

The coarse sand and gravel layer of the aquifer is relatively coarse, the permeability coefficient is relatively large, the water volume is quite large, the water depth is from 3 to 15m.

The permeability coefficient is quite large, the amount of groundwater is high.

Above the soil there is an upper layer of standing water or aquifer and below it is an aquifer that does not contain water, or a relatively stable immersion or pressurized aquifer.

Saturated clay soil, especially silt or silty soil, has a very small permeability coefficient, less than 0.1 m/day.

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