CN107192650B - Method for taking undisturbed soil permeability test soil sample by wax sealing - Google Patents
Method for taking undisturbed soil permeability test soil sample by wax sealing Download PDFInfo
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- CN107192650B CN107192650B CN201710245204.5A CN201710245204A CN107192650B CN 107192650 B CN107192650 B CN 107192650B CN 201710245204 A CN201710245204 A CN 201710245204A CN 107192650 B CN107192650 B CN 107192650B
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- 239000002689 soil Substances 0.000 title claims abstract description 118
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 230000035699 permeability Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007789 sealing Methods 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 27
- 238000002474 experimental method Methods 0.000 claims abstract description 15
- 230000035515 penetration Effects 0.000 claims abstract description 15
- 229940099259 vaseline Drugs 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000004927 clay Substances 0.000 abstract description 7
- 238000010998 test method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for taking undisturbed soil permeability test soil sample by wax sealing, which comprises the following steps: (1) taking out the whole soil sample, cutting the soil sample into a cylinder by using a cutting method, wherein the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring, and the height of the cylindrical soil sample is larger than the height of the sampling cutting ring; (2) performing wax sealing on the periphery of the cylindrical soil sample, wherein the soil sample is sealed into a cylindrical shape by the wax sealing, and the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring; (3) uniformly coating vaseline on the inner wall and the outer wall of the ring cutter, uniformly cutting the waxy cylindrical soil sample by the ring cutter to form a complete penetration experiment soil sample of the ring cutter, the vaseline, a wax sealing layer and an original soil sample from outside to inside; (4) loading the prepared soil sample for the penetration experiment into a permeameter for testing; (5) and after the experiment is finished, the actual area of the soil sample replaces the area of the cutting ring to calculate the permeability coefficient. The method is simple and convenient in test, can ensure the original permeability of undisturbed soil, and is particularly suitable for harder hard plastic clay or strongly completely weathered mudstone.
Description
Technical Field
The invention relates to the field of geotechnical engineering tests, in particular to a method for taking an undisturbed permeability test soil sample by wax sealing.
Background
The permeability coefficient is an index which comprehensively reflects the permeability of the soil body, and the correct determination of the numerical value of the permeability coefficient has very important significance for the permeability calculation. The general methods for indoor tests of permeability coefficient mainly include a constant head test method and a variable head test method, wherein the constant head test method is suitable for sandy soil with high water permeability, and the variable head test method is suitable for cohesive soil with low water permeability. In the test process, the undisturbed sample is required to be adopted when the test is carried out on the undisturbed soil sample. However, in the case of undisturbed soil required by permeability coefficient in an indoor test, when sampling is performed, particularly hard-hard plastic clay, a cutting ring method is adopted for sampling, so that a sample is often broken, or too hard, the cutting ring cannot be pressed into the soil successfully. Even if sampling is successful, disturbance is inevitably generated in the processes of transportation, sample preparation and the like, and the soil sample is loosened so that the real permeability coefficient cannot be tested. In addition, because the soil is hard, the soil sample cannot be prepared and used only by remolding the soil sample, and the prepared soil sample cannot well reflect the characteristics of undisturbed soil.
At present, the penetration test of soil mass is generally carried out by adopting a cutting ring. Because the undisturbed soil is hard and brittle, when the cutting is carried out by using the cutting ring, the sample is easy to break, and the cutting of the sample by the cutting ring of the rock-soil body with hard part is difficult. Therefore, most of the samples cannot be cut by using a cutting ring, and only the samples can be cut by adopting a cutting method.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a method for taking an undisturbed soil permeability test soil sample by wax sealing, so that the defect that the soil sample is often broken or too hard to be pressed into a cutting ring for smooth sampling when the soil sample is taken for testing is overcome.
In order to achieve the purpose, the invention provides a method for taking undisturbed soil permeability test soil sample by wax sealing, which comprises the following steps:
(1) taking a soil sample, taking out the whole soil sample, cutting the soil sample into a cylinder by using a cutting method, wherein the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring, and the height of the cylindrical soil sample is larger than the height of the sampling cutting ring;
(2) performing wax sealing on the periphery of the cylindrical soil sample in the step (1), wherein the soil sample is sealed into a cylindrical shape by using the wax, and the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring;
(3) uniformly coating vaseline on the inner wall and the outer wall of the ring cutter, uniformly cutting the waxy cylindrical soil sample prepared in the step (2) by using the ring cutter to form a complete penetration experiment soil sample of the ring cutter, the vaseline, the wax sealing layer and the undisturbed soil sample from outside to inside;
(4) loading the soil sample for the penetration experiment prepared in the step (3) into a permeameter for testing;
(5) and after the experiment is finished, the actual area of the soil sample replaces the area of the cutting ring to calculate the permeability coefficient.
Preferably, in the above technical scheme, in the step (1), the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring by 0.5-1cm, and the height is larger than the height of the sampling cutting ring by 2-3 cm.
Preferably, in the above technical solution, the thickness of the wax seal in the step (2) is 1-2cm, and the total size of the cylinder is required to be larger than the inner diameter of the cutting ring by 1.5-3 cm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention relates to a method for taking an undisturbed soil penetration test soil sample by wax sealing, which comprises the steps of cutting the sample by a cutting method, wherein the cut sample is smaller than a cutting ring by one size and shape, performing wax sealing on the side periphery of the sample after the cutting is finished, wherein the size of the wax sealing is larger than the diameter of the cutting ring, and then cutting the wax-sealed sample by the cutting ring coated with vaseline, so that the obtained sample can be subjected to a penetration test in a penetration tester by the cutting ring. The method is simple and convenient in test and low in cost, can ensure the original permeability of undisturbed soil, and is suitable for some harder hard plastic clay or strongly completely weathered mudstone.
(2) The method provided by the invention has the advantages that the undisturbed permeability samples of hard-hard plastic clay, fully-strongly weathered mudstone, sandstone and the like are obtained, the undisturbed effect of rock soil is ensured to be obvious, the method is simple, the cost is low, the inaccuracy of sampling crushing failure test and sample remolding is avoided, and the accuracy of permeability coefficient measurement in a permeability test can be ensured.
Drawings
Fig. 1 is a plan view of a test soil sample obtained by a method of wax-sealing undisturbed soil infiltration test according to the present invention.
Fig. 2 is a cross-sectional view of a test soil sample obtained by a method for wax sealing the undisturbed soil to penetrate the test soil sample according to the present invention.
Description of the main reference numerals:
1-soil sample, 2-wax sealing layer, 3-vaseline layer and 4-cutting ring.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
A method for taking an undisturbed hard plastic clay penetration test soil sample by wax sealing comprises the following steps:
(1) sampling soil: taking out the hard plastic clay soil sample, cutting the soil sample into a cylinder by using a cutting method, wherein the diameter of the cylinder soil sample is slightly smaller than the inner diameter of the sampling cutting ring by 0.5-1cm, and the height of the cylinder soil sample is slightly larger than the height of the sampling cutting ring by 2-3 cm;
(2) performing wax sealing on the periphery of the cylindrical soil sample in the step (1), wherein the soil sample is sealed into a cylindrical shape by using the wax, and the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring; the thickness of the wax seal is 1-2cm, and the overall size requirement of the cylinder is 1.5-3cm larger than the inner diameter of the cutting ring.
(3) Uniformly coating vaseline on the inner wall and the outer wall of the ring cutter, uniformly cutting the waxy cylindrical soil sample prepared in the step (2) by using the ring cutter, and then cooling the ring cutter to be transparent, and cutting and flattening the redundant soil sample to form a complete penetration experiment soil sample from the outside to the inner ring cutter 4, the vaseline 3, the wax sealing layer 2 and the undisturbed soil sample 1; as shown in fig. 1-2.
(4) Loading the soil sample for the penetration experiment prepared in the step (3) into a permeameter for testing;
(5) and after the experiment is finished, the actual area of the soil sample replaces the area of the cutting ring to calculate the permeability coefficient.
Example 2
The fully-weathered mud and sandstone are looser than hard plastic clay, so the wax seal takes an undisturbed strongly-weathered mudstone permeability test soil sample, and the method comprises the following steps:
(1) sampling soil: excavating a soil sample pit until the position needing sampling is excavated; excavating rock and soil mass around the soil sample to a depth which is slightly larger than the height of the sampling cutting ring by 2-3cm, and keeping the diameter of the soil sample to be slightly larger than the size of the cutting ring; cutting the soil sample into a cylinder by using a cutting method, wherein the diameter of the cylindrical soil sample is slightly smaller than the inner diameter of the sampling cutting ring by 0.5-1 cm;
(2) performing wax sealing on the periphery of the cylindrical soil sample in the step (1), wherein the soil sample is sealed into a cylindrical shape by using the wax, and the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring; the thickness of the wax seal is 1-2cm, and the overall size requirement of the cylinder is 1.5-3cm greater than the inner diameter of the cutting ring;
(3) uniformly coating vaseline on the inner wall and the outer wall of the ring cutter, uniformly cutting the waxy cylindrical soil sample prepared in the step (2) by using the ring cutter, cutting the fully-weathered mud and sandstone at the bottom of the ring cutter, taking out a sample, and finally cutting and flattening redundant soil samples at two ends to form a complete penetration experiment soil sample from the outside to the inside of the ring cutter 4, the vaseline 3, the wax sealing layer 2 and the undisturbed soil sample 1; as shown in fig. 1-2.
(4) Loading the soil sample for the penetration experiment prepared in the step (3) into a permeameter for testing;
(5) and after the experiment is finished, the actual area of the soil sample replaces the area of the cutting ring to calculate the permeability coefficient.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (3)
1. A method for taking undisturbed soil permeability test soil sample by wax sealing is characterized by comprising the following steps:
(1) taking a soil sample, taking out the whole soil sample, cutting the soil sample into a cylinder by using a cutting method, wherein the diameter of the cylindrical soil sample is smaller than the inner diameter of the sampling cutting ring, and the height of the cylindrical soil sample is larger than the height of the sampling cutting ring;
(2) performing wax sealing on the periphery of the cylindrical soil sample in the step (1), wherein the soil sample is sealed into a cylindrical shape by using the wax, and the diameter of the cylindrical soil sample is larger than the inner diameter of the sampling cutting ring;
(3) uniformly coating vaseline on the inner wall and the outer wall of the ring cutter, uniformly cutting the waxy cylindrical soil sample prepared in the step (2) by using the ring cutter to form a complete penetration experiment soil sample of the ring cutter, the vaseline, the wax sealing layer and the undisturbed soil sample from outside to inside;
(4) loading the soil sample for the penetration experiment prepared in the step (3) into a permeameter for testing;
(5) and after the experiment is finished, the actual area of the soil sample replaces the area of the cutting ring to calculate the permeability coefficient.
2. The method for wax sealing undisturbed soil permeability test soil sample in the step (1), wherein the diameter of the cylindrical soil sample in the step (1) is 0.5-1cm smaller than the inner diameter of the sampling cutting ring, and the height of the cylindrical soil sample is 2-3cm larger than the height of the sampling cutting ring.
3. The method for taking undisturbed soil permeability test soil sample by wax sealing according to claim 1, wherein the thickness of the wax sealing in the step (2) is 1-2cm, and the overall dimension requirement of the cylinder is 1.5-3cm larger than the inner diameter of the cutting ring.
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| CN201710245204.5A CN107192650B (en) | 2017-04-14 | 2017-04-14 | Method for taking undisturbed soil permeability test soil sample by wax sealing |
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| CN201710245204.5A CN107192650B (en) | 2017-04-14 | 2017-04-14 | Method for taking undisturbed soil permeability test soil sample by wax sealing |
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| CN107192650B true CN107192650B (en) | 2020-12-08 |
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| CN117169095B (en) * | 2023-08-30 | 2024-03-29 | 宁夏大学 | Erosion experimental equipment of rainwater seepage soil column |
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| CN101482468A (en) * | 2009-02-11 | 2009-07-15 | 西北农林科技大学 | Method for testing impermeability of sealant and concrete bonding sample interface |
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| CN101485282B (en) * | 2009-02-18 | 2011-04-06 | 安徽农业大学 | Ecological protection greening substrate for rock slope |
| CN102435542A (en) * | 2011-11-23 | 2012-05-02 | 王曦 | Full-automatic mould-pressing demoulding penetration resistant testing machine |
| CN102636427B (en) * | 2012-03-26 | 2014-03-12 | 长沙理工大学 | Tester for soil vertical and radial expansive deformation and expansive force relation |
| CN103528852B (en) * | 2013-10-31 | 2015-07-08 | 南京大学 | Undisturbed sampling method capable of effectively preventing coarse-grained soil from leaking through side wall |
| CN104266887B (en) * | 2014-09-25 | 2016-09-21 | 中国科学院武汉岩土力学研究所 | Electronic static(al) two-way remoulded sample sampling instrument |
| CN105547779B (en) * | 2015-12-24 | 2018-07-31 | 辽宁省水文局 | Water-retaining quantity among field of soil soil sample production method, device and measurement method |
| CN105604341B (en) * | 2015-12-31 | 2017-07-11 | 陕西师范大学 | A kind of high sand content earthen ruins reinforcement means |
| CN105738269A (en) * | 2016-05-10 | 2016-07-06 | 核工业湖州工程勘察院 | Device for measuring permeability coefficient of concrete |
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| CN101482468A (en) * | 2009-02-11 | 2009-07-15 | 西北农林科技大学 | Method for testing impermeability of sealant and concrete bonding sample interface |
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