CN113203659A - Method for detecting compaction degree of dry-pressed aeolian sand roadbed by water immersion ring cutting method - Google Patents
Method for detecting compaction degree of dry-pressed aeolian sand roadbed by water immersion ring cutting method Download PDFInfo
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- CN113203659A CN113203659A CN202110480643.0A CN202110480643A CN113203659A CN 113203659 A CN113203659 A CN 113203659A CN 202110480643 A CN202110480643 A CN 202110480643A CN 113203659 A CN113203659 A CN 113203659A
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- 239000004576 sand Substances 0.000 title claims abstract description 115
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000005520 cutting process Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000005056 compaction Methods 0.000 title claims abstract description 21
- 238000007654 immersion Methods 0.000 title claims abstract description 11
- 239000004744 fabric Substances 0.000 claims abstract description 41
- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 239000012466 permeate Substances 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 2
- 230000007480 spreading Effects 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000008021 deposition Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N2009/022—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids
- G01N2009/024—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids the volume being determined directly, e.g. by size of container
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Abstract
The invention discloses a method for detecting the compaction degree of a dry-pressed sand-accumulated roadbed by a water immersion ring-knife method, which comprises the following steps: leveling the surface of the aeolian sand layer of the roadbed; after the permeable cloth is soaked, the permeable cloth is laid on the surface of the aeolian sand layer, water is continuously sprayed on the permeable cloth, so that the water permeates into the aeolian sand layer in the area covered by the permeable cloth, and after the aeolian sand layer is soaked to a sufficient depth, the permeable cloth is removed; vertically pressing the cutting edge of the cutting ring into the wetted aeolian sand layer, after filling the aeolian sand layer sample in the hollow cavity of the cutting ring, digging out the cutting ring along the outer wall of the bottom of the cutting ring and cleaning the outer side of the cutting ring to ensure that the sample volume is equal to the volume of the hollow cavity of the cutting ring; weighing the cutting ring and the aeolian sand layer sample together, and calculating to obtain the wet density of the aeolian sand layer sample in a wet state; and calculating to obtain the dry density of the aeolian sand layer sample by detecting the water content of the aeolian sand layer sample, and further calculating to obtain the compactness of the aeolian sand layer sample. The effects of convenient sampling, rapid detection and detection error reduction are realized.
Description
Technical Field
The invention belongs to the technical field of roadbed compactness detection, and particularly relates to a method for detecting the compactness of a dry-pressed aeolian sand roadbed by a water immersion cutting ring method.
Background
A large amount of aeolian sand exists in the desert area, and the cost of road engineering can be reduced by using local materials to fill the roadbed by utilizing the aeolian sand; and the dry pressing method is used for construction, so that water resources in desert areas can be saved. The aeolian sand serving as the roadbed filler has the advantages of high overall strength, small and uniform sedimentation amount, small fluctuation of the rebound modulus and the like, and also has the defects of low natural water content, no caking property, poor grading, poor water retention and the like. Aeolian sand may exhibit a greater density, either in a dry or hydrated state, resulting in a bimodal curve on a graph of density and moisture content, a characteristic not possessed by other road base fillers.
The compactness of the roadbed is one of the most important internal indexes for the construction quality management of road engineering, and the compactness refers to the ratio of the dry density of a compacted road building material to the standard maximum dry density. The dry density is the density of the soil when there is no water in the pores, and is calculated from the density and the water content. Standard maximum dry density refers to the dry density that a road material will achieve at an optimum moisture content according to standard compaction test methods. Therefore, the quality of the subgrade filled with the aeolian sand needs to be detected by sampling the aeolian sand layer and detecting the wet density and the dry density of the sample so as to calculate the compaction degree of the subgrade filled with the aeolian sand.
At present, the compaction degree of the aeolian sand subgrade filled by a dry compaction method is generally detected by a sand grouting method or a cutting ring method. When the sand filling method is adopted to detect the compaction degree, the operation steps are complicated, the test pit is easy to collapse, great error risk exists, and a large amount of time is consumed. When the ring cutter method is adopted to detect the compactness, the non-caking property of the aeolian sand can cause that the aeolian sand can not be bonded and fixed in the hollow cavity of the ring cutter, so that the sampling is difficult, and the serious detection error can be caused by the scattering of the sample in the sampling process.
Disclosure of Invention
The invention aims to provide a method for detecting the compaction degree of a dry-pressed aeolian sand roadbed by a water immersion cutting ring method.
The invention is realized by the following technical scheme:
a method for detecting the compaction degree of a dry-pressed aeolian sand roadbed by a water immersion ring knife method comprises the following steps:
the method comprises the following steps: leveling the surface of the aeolian sand layer of the roadbed;
step two: after the permeable cloth is soaked, the permeable cloth is laid on the surface of the aeolian sand layer, water is continuously sprayed on the permeable cloth, so that the water permeates into the aeolian sand layer in the area covered by the permeable cloth, and after the aeolian sand layer is soaked to a sufficient depth, the permeable cloth is removed;
step three: vertically pressing the cutting edge of the cutting ring into the wetted aeolian sand layer, after filling the aeolian sand layer sample in the hollow cavity of the cutting ring, digging out the cutting ring along the outer wall of the bottom of the cutting ring and cleaning the outer side of the cutting ring to ensure that the sample volume is equal to the volume of the hollow cavity of the cutting ring;
step four: weighing the cutting ring and the aeolian sand layer sample together, and calculating to obtain the wet density of the aeolian sand layer sample in a wet state;
step five: and calculating to obtain the dry density of the aeolian sand layer sample by detecting the water content of the aeolian sand layer sample, and further calculating to obtain the compactness of the aeolian sand layer sample.
Through the scheme, the invention at least obtains the following technical effects:
the method for detecting the dry-pressed aeolian sand roadbed compactness by the water immersion cutting ring method utilizes the characteristic that the aeolian sand has high density peak values in a dry state or a water-containing state to obtain the density change rule of the dry state of the aeolian sand before water immersion and the water-containing state after water immersion. Before the cutting ring sampling is carried out, the water permeable cloth is used as a medium for uniformly permeating water, water slowly permeates into the air inlet sand deposition layer on the premise of not disturbing the air deposition sand layer, and the dry air deposition sand without cohesiveness is preprocessed into the air deposition sand in a water-containing state. The water molecules can form a complete water film to fully wrap the aeolian sand particles, so that the internal friction force among the aeolian sand particles is reduced, and meanwhile, the effect of mutual attraction is generated under the capillary action, so that the aeolian sand particles generate cohesiveness and are easy to form. When the cutting ring sampling is carried out again, the windage sand layer sample in a water-containing state can be conveniently sampled in a solid mode in the hollow cavity of the cutting ring, and the sample is not easy to break up and fall off, so that the detection error is reduced.
Preferably, in the second step, after the permeable cloth is soaked, the permeable cloth is wrung to be in a state of no water dripping, and then the permeable cloth is spread and laid on the surface of the aeolian sand layer.
Preferably, in the second step, the distance between the water outlet of the water spraying device for spraying water and the water permeable cloth is 1-5 cm.
Preferably, in the second step, the depth of the wet sand deposit is controlled by the total water amount sprayed on the water permeable cloth and the standing time after the water permeates into the sand deposit, and the depth of the wet sand deposit is larger than the height of the cutting ring.
Preferably, after the permeable cloth is removed, the surface of the aeolian sand layer is scraped by 1cm to level the aeolian sand layer again.
Preferably, in the third step, when the wind-deposited sand layer sample is obtained through the cutting ring, the wind-deposited sand layer sample protrudes at least 2cm from the top port of the cutting ring by pressing the cutting ring downwards; after the cutting ring is taken out, the convex part at the end opening of the top of the cutting ring is scraped.
Preferably, in the third step, before the cutting ring is pressed into the air-deposited sand layer for sampling, the cutting ring is cleaned, and then weighing and volume detection are carried out.
The invention has the beneficial effects that:
by utilizing the characteristics of the aeolian sand, before the annular knife sampling, the aeolian sand layer is soaked in a slow permeation mode, so that the sampling area of the aeolian sand layer is in a water-containing state, and the cohesiveness among the aeolian sand particles is improved. And the problem that the sample is easy to break up can be avoided by reusing the cutting ring for sampling, so that the effects of convenience in sampling, quick detection and reduction of detection errors are realized.
Drawings
Fig. 1 is a block diagram of a process of detecting the degree of compaction of a dry-pressed sand-deposited roadbed by a submerged circular cutting method according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1:
as shown in fig. 1, the embodiment provides a method for detecting the compaction degree of a dry-pressed sand-deposited roadbed by a water immersion cutting ring method, which includes the following steps:
the method comprises the following steps: and defining a detection area on the surface of the aeolian sand layer of the roadbed, and leveling the surface of the aeolian sand layer in the detection area. Since the cutting ring with the diameter of 70mm and the height of 52mm is used for sampling in the embodiment, the defined detection area is a square area with the side length of 50 cm. It should be noted that the inside of the aeolian sand layer cannot be disturbed during leveling treatment, so that the surface of the aeolian sand layer is lightly scraped only by adopting a flat scraping mode.
Step two: and immersing the water permeable cloth in water, completely soaking, fishing out and wringing to dry, and spreading the water permeable cloth in a wet state without dripping on the surface of the aeolian sand layer in the detection area. Water is sprayed on the permeable cloth by using watering devices such as a watering can, the water can horizontally spread along the permeable cloth and then downwards permeate into the aeolian sand layer, and the permeable cloth can be used as a medium for diffusing the permeation range and improving the permeation uniformity. The permeable cloth is pretreated into a wet saturated state, so that the water seepage amount is convenient to control, and the wetting depth of the aeolian sand layer can be controlled by controlling the water amount and time sprayed on the permeable cloth.
In the water spraying process, the height difference between the water outlet of a watering device such as a watering can and the water permeable cloth is required to be kept within the range of 1-5 cm. If the height of the water outlet is too high, the potential energy rotation energy of water is increased, impact is generated on the aeolian sand layer below the water permeable cloth, the interior of the aeolian sand layer is disturbed, and the compaction degree detection result is influenced.
The depth of the aeolian sand layer below the water permeable cloth, which is wetted by water, can be estimated through the total water amount and the permeation time of the water permeable cloth, in the embodiment, the total water amount of the water spray is 3.3kg, the water is kept stand for 5 minutes after the water is completely permeated into the sand layer, the water is permeated more deeply and uniformly, the wetted depth of the aeolian sand layer is controlled to be about 20cm, and the depth required by the annular cutter with the height of 52mm for sampling is met.
After confirming that the depth of the wet sand layer can meet the requirement of the cutting ring for sampling, the permeable cloth can be removed. However, the surface of the aeolian sand layer in contact with the water permeable cloth still has the problem that the flatness is damaged by water spraying, water seepage or capping, so that the surface of the aeolian sand layer needs to be leveled again. And scraping the aeolian sand with the thickness of 1cm to form a new flat surface by adopting a flat scraping mode according to the principle of not disturbing the interior of the aeolian sand layer.
Step three: firstly cleaning the cutting ring, weighing and detecting the volume, then vertically pressing the cutting edge of the cutting ring downwards into the soaked aeolian sand layer, and allowing part of aeolian sand isolated by girdling of the cutting ring to enter a hollow cavity of the cutting ring along with the downward movement of the cutting ring to serve as an aeolian sand layer sample. And continuously pressing the cutting ring until the aeolian sand layer sample protrudes above a port at the top of the cutting ring by more than 2cm, and stopping pressing the cutting ring. Digging out the annular knife with the air-laid sand layer sample inside the annular knife along the outer wall of the bottom of the annular knife, respectively scraping the protruded air-laid sand at the top port of the annular knife and the protruded air-laid sand at the cutting edge part of the annular knife, and cleaning the outer wall of the annular knife to obtain a combined body of the annular knife and the air-laid sand layer sample in a water-containing state.
Step four: and (4) integrally weighing the combination of the cutting ring and the water-containing state sand accretion sample, and subtracting the independent weight of the cutting ring to obtain the weight of the water-containing pile body sand accretion sample. The volume of the cutting ring is the volume of the wind-deposited sand layer sample. And calculating the wet density of the water-containing-state aeolian sand layer sample according to a density formula.
Step five: and detecting the water content of the aeolian sand layer sample in the water-containing state, and calculating the dry density of the aeolian sand layer sample through the wet density and the water content according to a dry density calculation formula. The degree of compaction is the ratio of the dry density to the standard maximum dry density.
Various technical features in the above embodiments may be arbitrarily combined as long as there is no conflict or contradiction in the combination between the features, but is limited to the space and is not described one by one.
The present invention is not limited to the above-described embodiments, and various changes and modifications of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (7)
1. A method for detecting the compaction degree of a dry-pressed aeolian sand roadbed by a water immersion cutting ring method is characterized by comprising the following steps:
the method comprises the following steps: leveling the surface of the aeolian sand layer of the roadbed;
step two: after the permeable cloth is soaked, the permeable cloth is laid on the surface of the aeolian sand layer, water is continuously sprayed on the permeable cloth, so that the water permeates into the aeolian sand layer in the area covered by the permeable cloth, and after the aeolian sand layer is soaked to a sufficient depth, the permeable cloth is removed;
step three: vertically pressing the cutting edge of the cutting ring into the wetted aeolian sand layer, after filling the aeolian sand layer sample in the hollow cavity of the cutting ring, digging out the cutting ring along the outer wall of the bottom of the cutting ring and cleaning the outer side of the cutting ring to ensure that the sample volume is equal to the volume of the hollow cavity of the cutting ring;
step four: weighing the cutting ring and the aeolian sand layer sample together, and calculating to obtain the wet density of the aeolian sand layer sample in a wet state;
step five: and calculating to obtain the dry density of the aeolian sand layer sample by detecting the water content of the aeolian sand layer sample, and further calculating to obtain the compactness of the aeolian sand layer sample.
2. The method for detecting the compaction degree of the dry-pressed sand-deposited roadbed by the water-immersed cutting ring method according to claim 1, wherein the method comprises the following steps: and step two, after soaking the permeable cloth, wringing the permeable cloth to a state of no water dripping, and spreading the permeable cloth on the surface of the aeolian sand layer.
3. The method for detecting the compaction degree of the dry-pressed sand-deposited roadbed by the water-immersed cutting ring method according to claim 1, wherein the method comprises the following steps: in the second step, the distance between the water outlet of the water spraying device for spraying water and the permeable cloth is 1-5 cm.
4. The method for detecting the compaction degree of the dry-pressed sand-deposited roadbed by the water-immersed cutting ring method according to claim 1, wherein the method comprises the following steps: and in the second step, the soaked depth of the aeolian sand layer is controlled by the total water amount of the water sprayed on the water permeable cloth and the standing time after the water permeates into the aeolian sand layer, and the soaked depth of the aeolian sand layer is larger than the height of the cutting ring.
5. The method for detecting the compaction degree of the dry-pressed sand-deposited roadbed by the water-immersed cutting ring method according to claim 1, wherein the method comprises the following steps: after the permeable cloth was removed, the surface of the aeolian sand layer was scraped off by 1cm thickness to level the aeolian sand layer again.
6. The method for detecting the compaction degree of the dry-pressed sand-deposited roadbed by the water-immersed cutting ring method according to claim 1, wherein the method comprises the following steps: in the third step, when the wind-deposited sand layer sample is obtained through the cutting ring, the wind-deposited sand layer sample protrudes at least 2cm from the top port of the cutting ring by pressing the cutting ring downwards; after the cutting ring is taken out, the convex part at the end opening of the top of the cutting ring is scraped.
7. The method for detecting the compaction degree of the dry-pressed sand-deposited roadbed by the water-immersed cutting ring method according to claim 1, wherein the method comprises the following steps: and in the third step, before the cutting ring is pressed into the air-deposited sand layer for sampling, the cutting ring is cleaned, and then weighing and volume detection are carried out.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855751A (en) * | 2022-04-22 | 2022-08-05 | 河北理工工程管理咨询有限公司 | Engineering is managed with road bed compactness test device that fetches earth |
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2021
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Application publication date: 20210803 |