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Method for reinforcing and treating liquefied sandy soil foundation

A technology of sand foundation and reinforcement liquid, which is applied in foundation treatment, utilizes microbial mineralization to reinforce and treat liquefied sand foundation field, can solve the problems of high foundation treatment cost, limited impact depth of dynamic compaction method, and large environmental impact, and achieves the impact of Small size, good fluidity, and the effect of improving liquefaction resistance

Active Publication Date: 2015-03-25
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of these methods has certain limitations. For example, the impact depth of the dynamic compaction method is limited, generally only reaching about 10m; while the vibrating gravel pile method has a greater impact on the environment, and the cost of foundation treatment is higher

Method used

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  • Method for reinforcing and treating liquefied sandy soil foundation
  • Method for reinforcing and treating liquefied sandy soil foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, a kind of method for reinforcing and controlling liquefied sand foundation, such as figure 1 with figure 2 As shown, on the sandy soil layer 7 to be reinforced on the sandy soil foundation, several drainage pipes 1 are embedded by drilling, and several liquid inlet pipes 5 are buried around each drainage pipe 1. The several liquid inlet pipes 5 arranged like figure 2 The rectangle shown. The drain pipe 1 and the liquid inlet pipe 5 are both PVC pipes with an inner diameter of 5 cm and a wall thickness of 5 mm. The bottom end of each liquid inlet pipe 5 is equipped with a spherical diffusion head 9 with a diameter of 9 cm. The spherical diffusion head 9 is evenly provided with some liquid outlet holes, and the diameter of the liquid outlet holes is 5 mm. The wall of the drainage pipe 1 in the sand layer 7 to be reinforced is provided with a number of liquid inlet holes, and the number of liquid outlet holes of the drainage pipe 1 gradually increases f...

Embodiment 2

[0037] Embodiment 2, the method as described in embodiment 1, described reinforcement liquid is with water as solvent and contains calcium ion, urea and urea bacteria; Wherein: the mass concentration of urea is 50g / L, the carbon atom in calcium ion and urea The quantity ratio is 1:1, and the concentration of urea bacteria is 10 8 ~10 10 pcs / L; and the pH of the reinforcement solution is 5.5~6.5.

Embodiment 3

[0038] Embodiment 3, the method as described in embodiment 2, described calcium ion comes from soluble calcium salt, comprises calcium chloride or calcium nitrate.

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Abstract

The invention discloses a method for reinforcing and treating a liquefied sandy soil foundation. A plurality of drainage pipes are embedded in a to-be-reinforced sandy soil layer of the sandy soil foundation, a plurality of liquid inlet pipes are embedded in the periphery of each drainage pipe, and the upper ends of the liquid inlet pipes are communicated with a reinforcing liquid storage pool through a booster pump; the upper ends of the drainage pipes are connected with a vacuum pump through guide pipes; during reinforcing operation, reinforcing liquid is injected into the reinforcing liquid storage pool, the vacuum pump and the booster pump are started, the pressure difference is produced in the sandy soil foundation, the reinforcing liquid flows into the sandy soil foundation through the liquid inlet pipes, the reinforcing liquid and water in the sandy soil foundation are together drained from the drainage pipes, and operation is repeatedly conducted till reinforcing is completed. The sandy soil foundation is reinforced through the microorganism reinforcing liquid, the reinforcing liquid is high in mobility and can go deep into the sandy soil foundation, the compactness of the sandy soil foundation is improved, and the liquefaction-resistant strength of the foundation is improved; in addition, the reinforcing method is simple, the reinforcing depth is large, and the influences on the surrounding environment and adjacent buildings are small.

Description

technical field [0001] The invention relates to a foundation treatment technology in the field of geotechnical engineering, in particular to a method for strengthening and treating liquefied sandy soil foundation by utilizing microbial mineralization. Background technique [0002] The sandy soil foundation includes the underlying layer, the sandy soil layer to be reinforced and the upper covering soil layer. The liquefaction of the sandy soil is very serious to the damage to the structure, and it is easy to cause heavy losses. At present, the seismic treatment methods for liquefiable sand foundation mainly include dynamic compaction method, vibrating gravel pile method and compacted sand pile method. However, the use of these methods has certain limitations. For example, the impact depth of the dynamic compaction method is limited, generally only reaching about 10m; while the vibrating gravel pile method has a greater impact on the environment, and the cost of foundation tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12
CPCE02D3/12
Inventor 张振东李明东李琳田安国李驰
Owner HUAIHAI INST OF TECH
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