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Apparatus and method for preparing physical and chemical method improved soil samples containing directional distribution fibers

A technology for directional distribution and soil improvement, which is applied in the direction of measuring devices, test sample preparation, sampling, etc., to achieve the effects of easy production, high sample preparation precision, and precise compaction control

Inactive Publication Date: 2021-08-03
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Apparatus and method for preparing physical and chemical method improved soil samples containing directional distribution fibers
  • Apparatus and method for preparing physical and chemical method improved soil samples containing directional distribution fibers
  • Apparatus and method for preparing physical and chemical method improved soil samples containing directional distribution fibers

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Embodiment

[0057] A method for preparing a triaxial compression sample of directional distributed jute fiber reinforced lime solidified expansive soil with fiber orientations of 0°, 15°, 30°, 45°, 60°, 75° and 90°.

[0058] The schematic diagram of the sample preparation process and method is as follows: Figure 7 –9 shown.

[0059] Step 1: Prepare materials. The soil to be improved is weak potential expansive soil taken from a deep foundation pit of a station on Hefei Metro Line 1. Its basic physical and mechanical properties are: natural density 2.69g / cm 3 , natural moisture content 21.3%, specific gravity 2.69, free expansion rate 53%, plastic limit 20.1%, liquid limit 42.7%, optimum moisture content 18%, maximum dry density 1.72g / cm 3 . The selected reinforcement material is jute fiber, which is one of the cheapest and most widely used natural fibers, known as "golden fiber". Of all the natural fiber types, jute has the highest tensile strength and is resistant to crushing and hi...

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Abstract

The invention discloses a device and method for preparing a physical-chemical method improved soil sample containing directional distributed fibers. The device includes a detachable mold, a compaction positioning plate, a compaction hammer system and a fiber orientation screen; the detachable mold Including the bottom steel plate, two outer steel plates, two inner steel plates and several threaded steel tie rods; the bottom steel plate cooperates with self-tapping screws through the side screw holes to fix the side steel plates; the inner surface of the outer steel plate is provided with two fixing holes for embedding the inner steel plates Groove and a positioning groove for fixing the compaction positioning plate and fiber orientation screen; the inner surface of the inner steel plate is also provided with a positioning groove, its size and function are the same as the positioning groove of the outer steel plate; the through screw hole on the upper part of the outer steel plate Cooperate with the threaded steel rod to fix the inner and outer steel plates; the compaction positioning plate is used to assist the positioning of the compaction hammer system; the fiber orientation screen is used to distribute the fibers in a direction parallel to the threaded steel rod. The device has the advantages of convenient assembly, high precision of sample preparation, precise compaction control and the like.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering foundation treatment, and in particular relates to a device and a method for preparing a physicochemically improved soil sample containing directional distributed fibers. Background technique [0002] With the development of economy and society, the construction of high-rise buildings, high-speed railways, bridges, tunnels and other projects has gradually expanded and extended to areas with poor geological conditions. In order to make the physical and mechanical properties of geotechnical materials in areas with poor geological conditions meet the needs of engineering construction, foundation treatment is often required. Common ground treatment techniques include physical methods, chemical methods, biological methods and combinations of the above methods. Among them, the physicochemical method that combines physical and chemical methods has attracted great attention from engineer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/38G01N1/44
CPCG01N1/286G01N1/38G01N1/44
Inventor 郭盼盼龚晓南
Owner ZHEJIANG UNIV
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