A kind of expansive soil foundation improved with sawdust fiber and its realization method

A realization method and soil foundation technology, applied in chemical instruments and methods, application, soil protection, etc., can solve the problems of not very prominent fiber reinforcement, small strength improvement, poor water temperature of fiber soil, etc. The process is simple and feasible, the implementation cost is low, and the effect of low expansion and contraction

Inactive Publication Date: 2017-07-28
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fiber soil has many advantages, it still has some shortcomings: the first is that the reinforcing effect of fiber is not very prominent, and the strength of soil after reinforcement is not greatly improved, which is far less than that of cement or cement-stabilized soil; The water temperature of the soil is poor, and it will disintegrate after soaking in water for a period of time

Method used

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  • A kind of expansive soil foundation improved with sawdust fiber and its realization method
  • A kind of expansive soil foundation improved with sawdust fiber and its realization method
  • A kind of expansive soil foundation improved with sawdust fiber and its realization method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1. When the realization method of the expansive soil foundation improved with sawdust fibers proposed by the present invention is applied to large-scale roadbeds or foundations, the specific operation steps are as follows: first, directly weigh the loose fill soil and sawdust fibers at the construction site, and then Laying loose filling soil, spraying wood chip fiber, mixing loose filling soil and wood chip fiber to form engineering soil filling, leveling the surface of engineering soil filling, and mechanically rolling engineering soil filling on the preset foundation in sequence; wherein: the mixing loose filling Soil and sawdust fibers are used to form engineering soil filler, which means that the loose fill soil and sawdust fibers are turned over 2 to 4 times with a nail-toothed rake, and the soil blocks are crushed. The particle size of the crushed soil is controlled at 5cm The following; then use a tiller to turn the soil along the road, and then spray th...

Embodiment 2

[0028] Example 2. combine Figure 4 , when the realization method of a kind of expansive soil foundation improved with sawdust fiber proposed by the present invention is applied to a higher subgrade or a thicker foundation, a layered method can be adopted, and the construction of each layer can be carried out according to the following 7 specific steps to implement:

[0029] Step 1: Lay loose fill after leveling the road bed or foundation bed. The loose fill has a thickness of 25-50 cm, a compaction coefficient of 1.5, and a compacted thickness of 10-20 cm.

[0030] Step 2: spread the loose fill soil evenly on the subgrade according to the mix ratio required by the design. The surface should be flat and the thickness should be uniform.

[0031] Step 3: Use a nail-toothed rake to turn the ash-filled soil for 2 to 4 times. This operation can break the soil clods and control the size of the soil particles below 5cm, which is convenient for mixing the loose fill soil and wood chip...

Embodiment 3

[0037] Example 3. When the implementation method of the expansive soil foundation improved with wood chip fibers proposed by the present invention is applied to small-scale roadbeds or foundations, the specific operation steps of the mixing are to use the mixer to mechanically mix the weighed wood chip fibers and loose fill soil. Mixing, if necessary, the surface of the wood chip fiber can be treated with a coupling agent. Since the soil material in the natural state is easy to agglomerate, the soil material should be crushed before mixing, and the particle size of the crushed loose fill soil should be controlled below 5cm. When mixing, first use a small blower to blow the specified amount of wood chip fibers into the mixer, that is, use the wind to break up the fibers, and then spray an appropriate amount of water into the mixer evenly according to the requirements of water content, and stir for 10 to 15 minutes. Immediately after that, samples were taken to observe the disp...

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Abstract

The invention relates to an expansive soil foundation improved with sawdust fibers and a realization method thereof. The invention proposes an expansive soil foundation improved with sawdust fibers and engineering soil thereof. It is characterized in that the engineering soil is mixed with sawdust fibers and mixed to form expansive soil base soil. The mixing amount of the sawdust fiber accounts for 2.5-12.5% ​​of the total mass of the engineering soil; the material of the sawdust fiber is planed sawdust that is naturally air-dried or artificially dried; the thickness of the sawdust fiber is not more than 1mm, and the length is 2-10mm and The width is not greater than 5mm. The invention significantly improves the engineering properties of the improved expansive soil such as strength, toughness, expansion and shrinkage and water temperature, and the improved expansive soil is generally applicable to the fields of geotechnical and hydraulic engineering.

Description

technical field [0001] The invention belongs to the technical field of foundations, in particular to an expansive soil foundation improved with sawdust fibers and a realization method thereof. Background technique [0002] At present, the ground treatment methods can be roughly divided into two categories, namely, stabilization methods and reinforcement methods. Commonly used stabilization methods mainly include cement improvement, lime improvement, fly ash improvement or polymer reagent improvement and other methods. Reinforcement methods usually include geotextiles, geomembranes, geogrids, continuous fiber reinforced soil methods, etc. [0003] In recent years, with the rapid development of chemical synthesis industry, artificial synthetic fiber has become a new type of reinforcement material, which is widely used in the fields of concrete engineering and geotechnical engineering. At present, the fiber reinforcement method is relatively mature in concrete engineering, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12C09K17/00
Inventor 孙树林王天宇张德恒王成李方
Owner HOHAI UNIV
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