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Sampling method and sampling device for original state sandy soil

A sampling device and sandy soil technology, applied in the field of geotechnical exploration engineering, can solve the problems of soil sample disturbance, low cohesion, and inability to represent the original soil characteristics, and achieve the effect of maintaining the original state and not being easily disturbed

Pending Publication Date: 2017-03-22
ZHEJIANG MIDDLE FOREST SURVEY RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for sandy soil, due to its very small cohesion, sampling with this device and method will cause great disturbance to the soil sample, and the obtained soil sample cannot represent the original characteristics of the soil in the sampling area

Method used

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  • Sampling method and sampling device for original state sandy soil
  • Sampling method and sampling device for original state sandy soil
  • Sampling method and sampling device for original state sandy soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for sampling undisturbed sandy soil, comprising the following steps:

[0046] (1) Assemble the force applicator 2, the sampling sleeve 3, and the soil-taking edge 4 together. In this embodiment, the force applicator 2, the sampling sleeve 3, and the soil-taking edge 4 are detachably clamped ;

[0047] (2) For the sandy soil to be sampled, use a shovel to clean up the soil layer above it. The cleaning area should be larger than the area to be sampled. The soil layer above the sandy soil varies according to the geology;

[0048] (3) Freeze the sandy soil area to be sampled. After the sandy soil is frozen, the sandy soil in the area will be solidified together to achieve the function of "shaping", so that in the subsequent sampling process It can avoid the deformation of sandy soil due to disturbance, and can well maintain the original state of the soil sample;

[0049] (4) After the freezing starts, pay attention to protecting the surrounding soil in the area to ...

Embodiment 2

[0073] Such as Figure 8-10 As shown, the difference between this embodiment and Embodiment 1 is that the lower end of the force applicator 2 is detachably clamped with the upper end of the sampling sleeve 3, and the lower end of the sampling sleeve 3 is connected with the cutting edge of the soil. The upper end of 4 is detachably clamped;

[0074] Specifically, the inner walls of the upper and lower ends of the sampling sleeve 3 are provided with bayonet openings 31 at intervals in the circumferential direction, and the outer walls of the lower end of the force applicator 2 and the upper end of the cutting edge 4 are respectively provided with The block 7 matched with the bayonet socket 31, the inner wall of the upper end and the lower end of the sampling sleeve 2 respectively have a step structure 8 at the inner end of the bayonet socket 31, the thickness of the step structure 8 and the force applicator 2, soil extraction The thickness of the inserting portion of the cuttin...

Embodiment 3

[0077] The difference between the present embodiment and the second embodiment is that the lower end of the force applicator 2 is threadedly connected to the upper end of the sampling sleeve 3, and the lower end of the sampling sleeve 3 is threadedly connected to the upper end of the cutting edge 4;

[0078] Specifically, the inner walls of the upper and lower ends of the sampling sleeve 3 are provided with internal threads, and the outer walls of the lower end of the force applicator 2 and the upper end of the cutting edge 4 are respectively provided with threads that cooperate with the internal threads. The outer thread of the upper end and the lower end of the sampling sleeve 3 has a step structure on the inner end of the inner thread respectively, and the thickness of the step structure is the same as that of the force applicator 2 and the insertion part of the soil cutting edge 4, So that the internal diameters of the force applicator 2, the sampling sleeve 3 and the soil-...

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Abstract

The invention discloses a sampling method for original state sandy soil. The method comprises the following steps: assembling a force applicator, a sampling sleeve and a soil taking cutting edge; for the sandy soil to be sampled, cleaning a soil layer covered above the sandy soil; carrying out freezing treatment on a sandy oil area to be sampled to solidify sandy oil in the area; pressing a sampling device for the sandy soil into the soil layer through the force applicator until the whole sampling device is full of a soil sample; clearing a soil body around the sampling device for the sandy soil, and forming an annular empty slot around the sampling device; slightly shaking the sampling device for the sandy soil to separate the sandy soil on the bottom end of the sampling device from the sampling device, and taking the sampling device out of the soil body; disassembling the force applicator, removing the residual soil body on the top end of the sampling sleeve, and installing an upper sealing cover; and disassembling the soil taking cutting edge, removing the residual soil body on the bottom end of the sampling sleeve, and installing a lower sealing cover. The method has the advantages that sampled sandy soil is less disturbed and is unlikely to become loose, and the original state sandy soil can be conveniently sampled, packaged, transported and transferred.

Description

technical field [0001] The invention belongs to the field of geotechnical exploration engineering, and in particular relates to a sandy soil sampling method and a sampling device thereof. Background technique [0002] With the continuous development of large-scale engineering construction in construction, municipal, transportation and other industries, the level of survey and design has been greatly improved, and the requirements for taking soil samples have also increased. At present, for sampling soil, it is often required to keep it in its original state. However, the soil is a three-phase system composed of solid matter, water and gas, and the soil structure is relatively loose, especially for sandy soil, because the cohesion is very small, during the sampling operation, sample packaging, storage, and transportation , it is very easy to disturb and destroy its original structural system, resulting in difficulty in sampling the original soil, or even sampling failure. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/08
CPCG01N1/08
Inventor 冯亮商夏明章柱勇钱卫东潘学标钱晓峰许四法
Owner ZHEJIANG MIDDLE FOREST SURVEY RES CO LTD
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