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Method for taking soil samples from undisturbed soil penetration test by wax sealing

A technology for testing soil and undisturbed soil, applied in the field of geotechnical engineering geotechnical testing, which can solve the problems of broken, unable to be pressed in by ring cutter, too hard, etc.

Active Publication Date: 2020-12-08
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for taking the undisturbed soil penetration test soil sample by wax sealing, so as to overcome the shortcomings of taking soil samples for testing, often broken, or too hard, and the ring knife cannot be pressed into the sample for smooth sampling

Method used

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  • Method for taking soil samples from undisturbed soil penetration test by wax sealing
  • Method for taking soil samples from undisturbed soil penetration test by wax sealing

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A kind of method that wax sealing gets original state hard plastic clay penetration test soil sample, comprises the following steps:

[0025] (1) Take soil samples: Take out the hard plastic clay soil sample as a whole, and cut the soil sample by knife cutting method, and cut it into a cylinder. Ring knife height 2-3cm;

[0026] (2) Carry out wax seal around the cylinder soil sample of described step (1), the soil sample wax seal is cylindrical, and the soil sample diameter of this cylinder is less than the internal diameter of sampling ring knife; The thickness of wax seal is 1- 2cm, the overall size of the cylinder is required to be 1.5-3cm larger than the inner diameter of the ring knife.

[0027] (3) Apply vaseline evenly on the inner wall and outer wall of the ring knife, cut the waxy cylindrical soil sample prepared in the step (2) evenly with the ring knife, and then cool the excess soil sample with the ring knife to cut evenly to form a complete The penetratio...

Embodiment 2

[0031] Fully weathered mud and sandstone are looser than hard plastic clay, so wax seal to take the original strong weathered mudstone penetration test soil samples, including the following steps:

[0032] (1) Take soil samples: Excavate the soil sample pit until the excavation needs sampling position; excavate the rock and soil around the soil sample to a height slightly greater than the height of the sampling ring knife by 2-3cm, and retain the soil sample diameter slightly larger than the ring knife Dimensions: cut the soil sample with a knife, and cut it into a cylinder. The diameter of the cylinder soil sample is slightly smaller than the inner diameter of the sampling ring knife by 0.5-1cm;

[0033] (2) Carry out wax seal around the cylinder soil sample of described step (1), the soil sample wax seal is cylindrical, and the soil sample diameter of this cylinder is less than the internal diameter of sampling ring knife; The thickness of wax seal is 1- 2cm, the overall siz...

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Abstract

The invention discloses a method of collecting undisturbed soil permeability test soil samples by wax sealing. The method comprises the steps that 1, the soil samples are taken out by whole block, and cutting is conducted on soil samples by using a peeling method, the cutting shape is cylindrical, the diameter of each cylindrical soil sample is less than the inner diameter of sampling ring cutter, the height is greater than the height of the sampling ring cutter; 2, wax sealing is conducted on the periphery of the cylindrical soil samples, the soil samples are sealed by wax into cylindrical shapes, the diameter of each cylindrical soil sample is smaller than the inner diameter of the sampling ring cutter; 3, the inner and outer walls of the ring cutter are evenly coated with Vaseline, the wax shape cylindrical soil samples are evenly cut by the ring cutter, complete permeability test soil samples are formed from outside to inside the ring cutter, the Vaseline, the wax seal layer, and the undisturbed soil samples; 4, experiments are conducted by loading the permeability test soil samples into a permeability apparatus; 5, after the experiments are completed, the permeability coefficient calculation is conducted by replacing the cutting ring area with the actual soil sample area. The method of collecting undisturbed soil permeability test soil samples by wax sealing is simple in experiment, the original permeability performance of the undisturbed soil can be guaranteed, and the method is suitably applied to rigid hard plastic clay or strong weathered mudstone.

Description

technical field [0001] The invention relates to the field of geotechnical engineering geotechnical tests, in particular to a method for taking undisturbed soil samples for penetration tests by wax sealing. Background technique [0002] The permeability coefficient is an index that comprehensively reflects the permeability of soil, and the correct determination of its value is of great significance to the calculation of permeability. The methods generally used in the indoor test of permeability coefficient mainly include constant head test method and variable head test method. The constant head test method is suitable for sandy soil with high water permeability, and the variable head method is suitable for cohesive soil with low water permeability. During the test, the original soil sample must be used when testing the undisturbed soil sample. However, due to the undisturbed soil required for the permeability coefficient in the laboratory test, when sampling, especially the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N1/28G01N1/36G01N1/04
CPCG01N1/04G01N1/286G01N1/36G01N15/08
Inventor 张红日谭国强徐钦帮陆世斌张无畏施智宋建平兰素恋李侑军谭毅夏旖琪蒙治光
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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