Liquefaction resistance foundation stabilization method by grate hooping

A foundation reinforcement and anti-liquefaction technology, which is applied in basic structure engineering, soil protection, construction, etc., can solve the problems of limited lateral displacement, low overall foundation stiffness, obvious subsidence, inclination, etc., to achieve strong applicability, Eliminate subsidence due to liquefaction of the ground, less impact on the environment

Active Publication Date: 2014-04-30
CHINA CHEM ENG SECOND CONSTR +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Each of the above treatment measures has its scope of application, advantages and disadvantages. For example, the enclosing method currently uses steel sheet piles and underground diaphragm walls for enclosing. Foundation) or when there is pressure on the liquefied foundation (such as road subgrade), the foundation can be surrounded, so that the influence of easy liquefaction on the outside of the foundation can be controlled, and the saturated sand and silt below the foundation can be restricted from sandblasting or lateral flow. Such as liquefaction macroscopic phenomena lead to the escape and loss of foundation soil, so as to avoid obvious subsidence and inclination of the foundation, and achieve a certain anti-liquefaction effect; but the cost is relatively high. When the enclosure area is large, the enclosure center will still have high super static The pore water pressure and the shear strain caused by the earthquake cannot be ignored. It is not applicable to the use of strip foundations or independent foundations. The overall stiffness of the foundation is not high, and the lateral displacement caused by liquefaction in the gentle slope area near the river bank is limited.

Method used

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  • Liquefaction resistance foundation stabilization method by grate hooping
  • Liquefaction resistance foundation stabilization method by grate hooping
  • Liquefaction resistance foundation stabilization method by grate hooping

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment one: see figure 1 , figure 2 , image 3 , the site is located in a gentle slope area, the ground slope is about 12°, and the foundation is a large-scale monolithic foundation 4 (raft foundation). Soil pile wall 1 adopts such as figure 2 The grid structure shown is constructed by cutting and lapping the cement-soil pile 2; the cement-soil pile wall 1 penetrates the liquefied soil layer 6 and extends into the stable soil layer 7 below the liquefaction depth; To improve the bearing capacity of the anti-liquefaction composite foundation and reduce settlement deformation, the vertical reinforcements 3 are commonly arranged in a square; the composite foundation is provided with a 30cm-thick graded sandstone cushion layer 5 .

Embodiment 2

[0049] Embodiment two: see Figure 4 , the foundation is an independent foundation, and the cement-soil pile wall is arranged under the axis of 1 column, which divides the foundation into a closed grid; under the independent foundation, the foundation treatment is carried out according to the conventional method, so that the bearing capacity and settlement deformation of the composite foundation meet the design requirements, and It is integrated with the cement-soil pile wall 1 to improve the overall strength and rigidity of the foundation.

Embodiment 3

[0050] Embodiment three: see Figure 5 , Figure 6 , the foundation is a strip foundation 8, and the cement-soil pile wall 1 is arranged under the strip foundation wall. The cutting and lapping method is adopted to divide the foundation into closed grids; Stone mattress cushion 5.

[0051] A project is a comprehensive building near the Fenhe River in Taiyuan City, with a height of 10 floors and a frame structure. The raft foundation is designed, which requires high bearing capacity of the foundation and is sensitive to settlement deformation. The site is located in a gentle slope area, the ground slope is about 12°, the seismic fortification intensity is 8 degrees, the liquefaction level of the foundation is serious, and the composition and distribution of the foundation soil layer is: the upper part is saturated sandy soil and silt soil, and the silt soil has a strong sense of sand, loose to slightly dense , with a layer thickness of 7.5-10.0m; the lower part is silty clay,...

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Abstract

A liquefaction resistance foundation stabilization method by grate hooping belongs to the field of building and specifically is a foundation treatment method. Cement piling wall grates are made in a foundation to hoop soil under the foundation, and the foundation is separated into a plurality of enclosed grids. By the aid of the liquefaction resistance foundation stabilization method by grate hooping, integral strength and rigidity of the foundation are improved greatly, and meanwhile most of shearing strength generated by earthquake load is shared by the cement hoop piling walls to limit foundation deformation greatly, so that hyperstatic pore water pressure of saturated sand and floury soil in the grids is restrained effectively, and a great liquefaction resisting function is achieved.

Description

technical field [0001] The invention belongs to the field of construction, and it is applied to the anti-liquefaction treatment of foundations (structures) in engineering fields such as housing construction, municipal administration, water conservancy and hydropower, petroleum and petrochemical, road and railway, and is specifically a solution to the problem of thick saturated sand and soil It is a new foundation treatment method that the silt foundation will liquefy under the action of earthquake load, and its strength will be almost completely lost, which will lead to foundation subsidence, lateral expansion or sliding. Background technique [0002] According to the mechanism of foundation soil liquefaction, there are two main ways to prevent and control the hazards of foundation liquefaction of buildings (structures): [0003] (1) Improvement of liquefiable soil soil quality: Improve the ability of the foundation soil to resist liquefaction in the early stage by improving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D3/10
Inventor 阳满春张永义
Owner CHINA CHEM ENG SECOND CONSTR
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