Method for treating ground foundation of expansive soil area by using geotextile bag and application thereof

A treatment method and expansive soil technology, which is applied in foundation structure engineering, construction, etc., can solve the problems of pile bearing capacity drop, change of soil properties, complex working state of expansive soil pile foundation, etc., to achieve reduced water-immersion deformation and large permeability coefficient Effect

Inactive Publication Date: 2008-04-30
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this method mixes chemical substances into the soil, which changes the properties of the soil, it is not conducive to environmental protection; the working state of the pile foundation of expansive soil is more complicated, and when it is soaked in water, a shear force is generated between the pile side and the soil, and it shrinks when it loses water. After that, negative friction will be generated around the pile body. Moreover, after soaking in water, due to the decrease in soil strength and softening of the soil, the bearing capacity of the pile will be greatly reduced.

Method used

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  • Method for treating ground foundation of expansive soil area by using geotextile bag and application thereof
  • Method for treating ground foundation of expansive soil area by using geotextile bag and application thereof
  • Method for treating ground foundation of expansive soil area by using geotextile bag and application thereof

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Effect test

Embodiment 1

[0027] Embodiment 1 A method for treating the foundation of the expansive soil area with a geotextile bag, and the steps of the treatment method are as follows:

[0028] (a) In the project construction site demarcated by the expansive soil area, the soil layer treatment depth required by the design is 4m, excavate the expansive soil of this depth (1) and put it into a 100cm×100cm geotechnical bag (2) , after the bag mouth is tied, the formed bagged expansive soil (3) is ready for use;

[0029] (b) On the exposed soil layer 4m from the treatment layer, compact the soil layer with a rolling machine;

[0030] (c) Lift the bagged expansive soil (3) to the project foundation, place the bagged expansive soil (3) in a criss-cross arrangement, and then press it into a flat shape with a rolling machine until it is compacted to the density required by the design Degree 1.5-2.0g / cm 3 So far, the gaps (4) between the bagged expansive soils (3) are filled with excavated expansive soils (...

Embodiment 2

[0032] Embodiment 2 The present invention will be further described with reference to the accompanying drawings and the existing indoor related test results.

[0033] The invention provides a method for treating expansive soil foundation with a geotextile bag, namely, the expansive soil excavated from a project construction site is directly put into the geotextile bag, stacked on the foundation of the project construction in a certain arrangement, and rolling equipment is used. The geotechnical bags filled with expansive soil are compacted layer by layer to form the foundation of the building.

[0034] The geotechnical bag material is a polypropylene (pp) woven bag mixed with 1% anti-aging agent (UV). 1m.

[0035] The bagged expansive soil is to use the expansive soil excavated in situ to pack as much as possible into the geotechnical bag, after filling, seal the bag mouth tightly, and then use the rolling equipment to compact the geotechnical bag to the required density. , ...

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Abstract

The invention relates to a method for treating a foundation in a swelling soil area using a geotextile bag. The method comprises the following steps: the swelling soil excavated at an engineering site is directly put into the geotextile bag of which the material and size are strictly controlled, and then the geotextile bag is stacked at the engineering site according to a certain arrangement mode, and the geotextile bag filled with the swelling soil is compacted by layers through adopting rolling equipment to form the foundation of a building. The functional principle of the method is as follows: in the process of uploading pressure and soaking expansion operation, the perimeter of the geotextile bag is elongated, thereby a tension is generated in the geotextile bag; on one hand the tension restricts the swelling deformation of the swelling soil, on the other hand the tension is equivalent to an added cohesion generated in the swelling soil, thereby the overall strength of the swelling soil packed in bag is improved. Treating the swelling soil foundation by the geotextile bag is green and environmental protecting, and the construction is simple, and the benefit is significant.

Description

1. Technical field [0001] The invention relates to a method for treating expansive soil foundations, in particular to a method for treating expansive soil foundations by using geotechnical bags, which can inhibit swelling and deformation of expansive soils when soaked in water, prevent expansive soil foundations from cracking, and enhance the strength of expansive soils. 2. Background technology [0002] Expansive soil (rock) is rich in hydrophilic minerals, mainly montmorillonite, which has the characteristics of volume expansion when water absorbs and shrinkage and deformation when water loses. High expansion force is generated when absorbing water. As a result of repeated expansion and contraction, the soil (rock) mass structure is destroyed, and the mechanical strength is reduced. Therefore, the following main problems are often encountered in the construction of expansive land areas: [0003] a. Deformation problems of building foundations [0004] The result of expa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/02
Inventor 刘斯宏汪易森
Owner HOHAI UNIV
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