A micro-nano bubble treatment device and operation method for liquefiable foundation

A technology of micro-nano bubbles and liquefied foundations, which is applied in infrastructure engineering, soil protection, construction, etc., can solve problems such as the inability to use existing building foundations, limited depth of reinforcement by dynamic compaction, and damage to buildings due to vibration, and achieve improved Anti-liquefaction ability, saving resources, and increasing the effect of shear strength

Active Publication Date: 2016-06-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The effective reinforcement depth of the dynamic compaction method is limited, and it is easy to cause vibration damage to nearby existing buildings
[0006] (2) Compacted sand piles, gravel piles and cement-soil mixing piles require a large amount of sand, gravel, and cement as raw materials during construction, and the cost is relatively high
[0007] (3) The above methods can only be used in the new construction process, but cannot be used in the existing building foundation

Method used

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  • A micro-nano bubble treatment device and operation method for liquefiable foundation
  • A micro-nano bubble treatment device and operation method for liquefiable foundation
  • A micro-nano bubble treatment device and operation method for liquefiable foundation

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Effect test

Embodiment 1

[0033] Embodiment 1: A kind of micro-nano bubble treatment can liquefy foundation and thereby strengthen the operation method of new building foundation, such as figure 2 As shown, the operation steps are as follows:

[0034] 1) According to the geological survey results, the position and depth of the liquefiable sand layer of the foundation are understood, and the drilling depth of the hollow drill pipe 5 is determined;

[0035] 2) Drilling positioning: such as figure 1 As shown, the boreholes 2 are arranged in a quincunx shape on the area to be reinforced 1, and the distance between the boreholes 2 is 3-4m;

[0036] 3) Embedding the jet head: use a drilling rig to vertically drive the hollow drill pipe 5 with the air jet head 3 into the bottom of the liquefiable sand layer of the foundation, remove the drilling rig, and expose the top of the hollow drill pipe 5 to the surface;

[0037] 4) The setting of the jet system: Utilize the air duct 7 to connect the hollow drill pi...

Embodiment 2

[0041]Embodiment 2: A kind of micro-nano bubble treatment can liquefy the ground and thereby strengthen the operation method of existing building foundation, such as figure 2 As shown, the difference with the embodiment is only that, step 3) when embedding the air jet head, utilize the drilling rig to drive the hollow drill rod 5 with the air jet head 3 obliquely into the bottom of the foundation liquefiable sand layer and remove the drilling machine, and ensure The jet head 3 is under the existing building, so that the top of the hollow drill pipe 5 is exposed to the ground. Step 5) During air injection, after the first air injection is completed, in order to vertically lift the air injection head 3 up by 3m to 4m, it is necessary to drill into the liquefiable sand from the recalculated borehole 2 through the hollow drill pipe 5 layer, and make the jet head 3 accurately located 3m-4m above the first jet. All the other construction steps are identical with embodiment 1.

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Abstract

The invention discloses a liquefiable foundation device for micro-nano bubble processing and an operation method. In terms of a liquefiable sand layer in a foundation, a mixture of micro-nano bubbles and water is injected through a micro-nano gas-liquid mixture generator, a compressor, an air guide pipe, a hollow drilling pipe, a gas sprayer and the like, the micro-nano bubbles can stay in soil for a long time, the saturation is reduced, shearing strength of the soil is enhanced, and accordingly liquefaction resistance of the liquefiable sand layer is remarkably improved. When the liquefiable sand layer bears a vibration load, gas left in the soil can serve as a buffering agent and effectively buffer the tendency that pore water pressure rises, and accordingly the liquefaction resistance of the foundation is improved.

Description

technical field [0001] The invention relates to a liquefiable foundation treatment device and method, in particular to an operation method for reinforcing a liquefiable foundation with micro-nano bubbles. Background technique [0002] my country is an earthquake-prone country, and it is also the country with the most serious earthquake disasters in the world. Earthquakes often threaten people's property and life safety. Since 1988, our country has entered a new period of seismic activity, and the frequency of earthquakes has increased significantly, which constitutes a potential threat that cannot be ignored for the safety of the infrastructure under construction and existing in our country. Generally speaking, there are two main forms of building damage caused by earthquakes: foundation failure and vibration damage. In the distribution area of ​​saturated sandy soil foundation, foundation liquefaction is the main form of foundation failure and the main cause of building dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10
Inventor 章定文彭尔兴孙文博刘松玉
Owner SOUTHEAST UNIV
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