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Method for improving Shanghai clay through polyvinyl alcohol fibers

A technology of polyvinyl alcohol fiber and clay, which is applied in the field of architecture, can solve the problems that cannot meet the strength and deformation requirements of construction projects, and achieve the effects of improving engineering hidden dangers, enhancing engineering characteristics, and increasing shear strength and compressive strength

Inactive Publication Date: 2016-08-17
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for improving Shanghai clay with polyvinyl alcohol fibers, which solves the problem that the Shanghai clay in the prior art cannot meet the strength and deformation requirements of construction projects. Asked technical questions

Method used

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  • Method for improving Shanghai clay through polyvinyl alcohol fibers
  • Method for improving Shanghai clay through polyvinyl alcohol fibers
  • Method for improving Shanghai clay through polyvinyl alcohol fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, clay preparation S1 is performed. The clay was taken from the construction site of a large-scale foundation pit project in Shanghai. (This kind of clay has high water content, large void ratio, high compressibility and other properties, which lead to a decrease in the strength of the soil) Its optimum water content is 20.78%, and the maximum dry density is 1.63g / cm 3 , the liquid limit moisture content is 42.27%, and the plastic limit moisture content rate is 20.46%. Air-dried under natural conditions, crushed and sieved. Make the clay particles no larger than 2mm. Take 3000g of soil in a compact state for each group of tests, and divide the soil into three parts.

[0023] Then, the preparation S2 of polyvinyl alcohol fiber is performed. Disperse the fiber group completely, according to the quality of the existing clay, take polyvinyl alcohol fibers according to the mass ratio of fiber to soil at 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, and 1.2% in a dense state, respect...

Embodiment 2

[0028] Example 2 In order to measure the effect of polyvinyl alcohol fibers improving clay, the following comparisons between the test group and the control group were carried out.

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Abstract

The present invention adopts a method for improving Shanghai clay with polyvinyl alcohol fibers. The Shanghai clay is taken, air-dried, crushed, passed through a 2mm geosieve, and vibrated and compacted on a vibrating table; the polyvinyl alcohol fibers are weighed, and the polyvinyl alcohol fibers The quality of the clay is 0.2%~1.2% of the quality of Shanghai clay, and the polyvinyl alcohol fibers are dispersed; the polyvinyl alcohol fibers are added in the order of clay-polyvinyl alcohol fibers-stirring evenly, so that the fiber surface of the polyvinyl alcohol fibers is the same as that of Shanghai The contact of clay is the largest; then add water, the moisture content of clay should be controlled between 15% and 25%, after stirring evenly, put the clay into a fresh-keeping bag; then keep the fresh-keeping bag at room temperature for 20-30 hours, and the improved Shanghai clay. The invention utilizes the high elastic modulus, tensile strength and other properties of the polyvinyl alcohol fiber to improve the shear strength, unconfined compressive strength and deformation resistance of the clay, thereby enhancing the engineering properties of the soil.

Description

technical field [0001] The invention belongs to the field of architecture and relates to clay, in particular to a method for improving Shanghai clay by using polyvinyl alcohol fibers. Background technique [0002] The shallow part of the Shanghai area is distributed with relatively thick soft clay layers. The unique properties of high water content, large void ratio, and high compressibility of clay in the Shanghai area can cause the strength of the soil to decrease, which seriously affects the stability and durability of the foundation or subgrade of construction projects. Therefore, untreated clay cannot meet the requirements of construction projects. In order to meet the strength and deformation requirements, we need to carry out reinforcement treatment in advance before using Shanghai clay. This requires us to continue to explore methods of soil improvement and to find reinforced materials with good effect and high practicability. [0003] Polyvinyl alcohol fiber is a ...

Claims

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Application Information

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IPC IPC(8): E02D3/00E02D3/046
CPCE02D3/005E02D3/046E02D2300/0054
Inventor 赵冬雪璩继立孙中明
Owner UNIV OF SHANGHAI FOR SCI & TECH
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