CN110596344A - Test device for testing expansion coefficient of soil texture - Google Patents
Test device for testing expansion coefficient of soil texture Download PDFInfo
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- CN110596344A CN110596344A CN201910680835.9A CN201910680835A CN110596344A CN 110596344 A CN110596344 A CN 110596344A CN 201910680835 A CN201910680835 A CN 201910680835A CN 110596344 A CN110596344 A CN 110596344A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a test device for testing the expansion coefficient of soil texture, which comprises: the soil sample collecting device comprises a cylinder body, a water tank and a water pump, wherein the cylinder body has a larger length-diameter ratio, a cavity for containing a soil sample is formed in the cylinder body, and the soil sample is arranged in the cavity; the two pressure plates are respectively arranged at two ends of the cylinder body and extend into the cavity; the two pressing mechanisms are respectively used for pressing the two pressing plates and obtaining the applied pressure through a pressing process; and the two displacement detection devices are respectively used for detecting the displacement of the pressure plate in the pressing process.
Description
Technical Field
The invention relates to a test device for testing the expansion coefficient of soil.
Background
In the building construction field, the expansion coefficient of the soil property of the construction area needs to be predicted, for this reason, an expansion system's that is used for testing soil property testing test device has appeared in the prior art, and the device includes the open rectangle box in upper end and stretches into the pressure disk in the box from the upper end of box, and this pressure disk utilizes the screw rod to exert pressure. And a soil sample is arranged in the box body, and the expansion coefficient of the soil sample is obtained through pressure test of a pressure plate.
The device has the following defects in measuring the expansion coefficient of the soil sample:
1. because of the shrinkage of the soil sample is reduced, the pressure plate only generates small displacement because of the characteristic that the shrinkage of the soil sample is very small in the pressure applying process, and the displacement is small, so that the precision of obtaining the displacement is low, and the measured expansion coefficient is inaccurate.
2. After the soil sample is loaded into the device, the soil sample is usually compacted by a tool such as a heavy hammer, and the compacting operation is inconvenient.
Disclosure of Invention
In view of the above technical problems in the prior art, embodiments of the present invention provide a testing apparatus for testing an expansion coefficient of soil.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a test device for testing the coefficient of expansion of soil mass, comprising:
the soil sample collecting device comprises a cylinder body, a water tank and a water pump, wherein the cylinder body has a larger length-diameter ratio, a cavity for containing a soil sample is formed in the cylinder body, and the soil sample is arranged in the cavity;
the two pressure plates are respectively arranged at two ends of the cylinder body and extend into the cavity;
the pressing mechanisms are respectively used for pressing the two pressing plates and obtaining the applied pressure through a pressing process;
and the two displacement detection devices are respectively used for detecting the displacement of the pressure plate in the pressing process.
Preferably, two ends of the cylinder body form a shrinkage cylinder, and the diameter of the shrinkage cylinder is smaller than that of the cylinder body; wherein:
the two pressing plates are respectively arranged in the two shrinkage barrels, and when the pressing plates are pressed, the pressing plates generate displacement in the shrinkage barrels.
Preferably, the shrinkage cylinder and the cylinder body are provided with conical cylinders, and the shrinkage cylinder and the cylinder body are transited by the conical cylinders.
Preferably, the cylinder is formed by butting a first cylinder and a second cylinder;
a first flange is formed on the outer side of the butt joint end of the first cylinder;
a second flange is formed on the outer side of the butt joint end of the second cylinder;
the front side of the first flange is provided with a plug;
a stepped hole is formed in the butt joint end of the second cylinder; the plug extends into the stepped hole;
the first flange and the second flange are arranged oppositely and at intervals, the first flange and the second flange are penetrated through by bolts, and the bolts are used for changing the distance between the first flange and the second flange so as to change the volume of the cavity surrounded by the first barrel and the second barrel, so that a soil sample in the cavity is compacted.
Preferably, a spring is disposed between the first flange and the second flange.
Preferably, the spring is sleeved on the bolt.
Preferably, the pressing mechanism comprises an oil cylinder;
the oil cylinder is fixed on the cylinder body, a push plate is arranged at the end part of a telescopic rod of the oil cylinder, and the push plate is used for pushing the pressure plate.
Preferably, the displacement detection device is a distance sensor, and the distance sensor is arranged on one side of the oil cylinder facing the pressure plate.
Compared with the prior art, the test device for testing the expansion coefficient of soil disclosed by the invention has the beneficial effects that: compared with a box structure in the prior art, the pressure plate can obtain larger displacement under the condition that the volume change of the soil sample is the same, so that even if some errors exist in the collected displacement, the errors account for smaller whole displacement, more accurate volume change can be obtained, and more accurate expansion coefficient can be obtained.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.
The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may depict like parts in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the inventive embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a schematic structural diagram of a test apparatus for testing the expansion coefficient of soil according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a of fig. 1.
Fig. 3 is an enlarged view of a portion B of fig. 1.
Reference numerals:
10-a cylinder body; 11-a first cylinder; 111-a first flange; 12-a second cylinder; 121-a second flange; 13-a shrink sleeve; 14-a cone; 20-pressing a plate; 30-a pressure mechanism; 31-oil cylinder; 32-a telescopic rod; 33-pushing the disc; 40-distance sensor; 50-bolt; 60-a spring; 100-soil sample.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item identified as preceding the word, covers the element or item identified as following the word and its equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention are omitted.
As shown in fig. 1 to 3, an embodiment of the present disclosure discloses a test apparatus for testing an expansion coefficient of soil, including: a cylinder 10, a platen 20, a pressing mechanism 30, and a displacement detecting device.
In the present invention, the barrel 10 is configured to have a relatively large length to diameter ratio, e.g., greater than 3:1, so that the length to diameter ratio of the chamber in the barrel 10 is relatively large (in the prior art, the length, width and height dimensions of the tank are substantially the same).
The number of the pressing plates 20 is two, and the two pressing plates 20 are respectively disposed at both ends of the cylinder 10 in the length direction and extend into the chamber.
And two pressing mechanisms 30, each of which includes two pressing mechanisms 30 for pressing the two platens 20 and obtaining a pressing force by a pressing process.
And the displacement detection devices comprise two displacement detection devices, and the two displacement detection devices are respectively used for detecting the displacement of the pressure plate 20 in the pressing process.
The pressure plate 20 presses the soil sample 100 in the chamber, so that the soil sample 100 in the chamber is compressed and changes in volume, and the volume change amount is equal to the product of the displacement of the pressure plate 20 and the pressure plate 20, therefore, the volume change amount of the soil sample 100 is obtained by obtaining the displacement of the pressure plate 20, and then the expansion coefficient (actually also referred to as the contraction coefficient) of the soil sample 100 is obtained according to the initial volume of the soil sample 100 and the pressure applied by the pressure plate 20 corresponding to the volume change amount.
The advantages of the above embodiment are:
compared with a box structure in the prior art, the volume change of the soil sample 100 is mainly reflected on the displacement of the pressure plate 20 due to the fact that the length-diameter ratio of the cylinder 10 is large, and the pressure plate 20 can obtain large displacement under the condition that the volume change of the soil sample 100 is the same, so that even if some errors exist in the collected displacement, the errors account for less than the whole displacement, accurate volume change can be obtained, and accurate expansion coefficients can be obtained.
In a preferred embodiment of the present invention, the two ends of the cylinder body 10 are formed with shrinkage cylinders 13, and the diameter of the shrinkage cylinders 13 is smaller than that of the cylinder body 10; wherein: when the platen 20 is pressed, the platen 20 is displaced in the shrinkage cylinder 13.
The advantages of the above embodiment are:
by providing the shrinkage cylinder 13, a larger displacement amount of the pressure plate 20 can be obtained and a more accurate volume change amount of the soil sample 100 can be obtained when the volume change amount of the soil sample 100 is the same.
In a preferred embodiment of the present invention, the shrinking cylinder 13 and the cylinder body 10 have a cone 14, and the shrinking cylinder 13 and the cylinder body 10 are transited by the cone 14.
The advantages of the above embodiment are:
by arranging the conical cylinder 14, the pressure applied by the pressure plate 20 to the soil sample 100 in the shrinkage cylinder 13 can be more effectively and uniformly transmitted to the soil sample 100 in the cylinder 10, that is, by arranging the conical cylinder 14, the pressed cross section of the soil sample 100 in the cylinder 10 is far larger than the area of the cross section in the shrinkage cylinder 13, which inevitably makes the pressed cross section of the soil sample 100 more uniform in the radial direction.
In a preferred embodiment of the present invention, the cartridge 10 is formed by a first cartridge 11 and a second cartridge 12 butted together; a first flange 111 is formed at the outer side of the butt end of the first cylinder 11; a second flange 121 is formed at the outer side of the butt end of the second cylinder 12; the front side of the first flange 111 has a plug; a stepped hole is formed in the butt end of the second cylinder 12; the plug extends into the stepped hole; the first flange 111 and the second flange 121 are arranged oppositely and at intervals, the first flange 111 and the second flange 121 are penetrated by the bolts 50, and the bolts 50 are used for changing the distance between the first flange 111 and the second flange 121 so as to change the volume of the cavity surrounded by the first cylinder 11 and the second cylinder 12 and further compact the soil sample 100 in the cavity. Preferably, a spring 60 is disposed between the first flange 111 and the second flange 121; the spring 60 is sleeved on the bolt 50.
The advantages of the above embodiment are:
after the soil sample 100 is arranged in the cavity defined by the first cylinder 11 and the second cylinder 12, the cavity is slightly contracted by screwing the bolt 50 so as to compact the soil sample 100 in the cavity, and compared with the compaction method in the prior art, the compaction method provided by the invention has the advantages that the soil sample 100 is more uniformly pressed, and the loosening phenomenon cannot occur.
In a preferred embodiment of the present invention, the pressing mechanism 30 includes an oil cylinder 31; the oil cylinder 31 is fixed on the cylinder body, and the end part of the telescopic rod 32 of the oil cylinder 31 is provided with a push plate 33, and the push plate 33 is used for pushing against the pressing disc 20.
The advantages of the above embodiment are:
the pressure applied by the platen 20 may be obtained not by providing a strain gauge but indirectly from the pressure of the hydraulic oil in the measurement cylinder 31.
Preferably, the displacement detecting means is a distance sensor 40, and the distance sensor 40 is disposed on a side of the cylinder 31 facing the platen 20 for measuring the displacement of the platen 20.
Moreover, although exemplary embodiments have been described herein, the scope of the present invention includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.
The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above-described embodiments, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (8)
1. A test device for testing the coefficient of expansion of soil mass, comprising:
the soil sample collecting device comprises a cylinder body, a water tank and a water pump, wherein the cylinder body has a larger length-diameter ratio, a cavity for containing a soil sample is formed in the cylinder body, and the soil sample is arranged in the cavity;
the two pressure plates are respectively arranged at two ends of the cylinder body and extend into the cavity;
the two pressing mechanisms are respectively used for pressing the two pressing plates and obtaining the applied pressure through a pressing process;
and the two displacement detection devices are respectively used for detecting the displacement of the pressure plate in the pressing process.
2. The test device for testing the expansion coefficient of soil property according to claim 1, wherein the two ends of the cylinder body form a shrinkage cylinder, and the diameter of the shrinkage cylinder is smaller than that of the cylinder body; wherein:
the two pressing plates are respectively arranged in the two shrinkage barrels, and when the pressing plates are pressed, the pressing plates generate displacement in the shrinkage barrels.
3. The testing apparatus for testing the expansion coefficient of soil property according to claim 2, wherein the shrinkage cylinder and the cylinder body have a cone cylinder, and the shrinkage cylinder and the cylinder body are transited by the cone cylinder.
4. The testing apparatus for testing the expansion coefficient of soil according to claim 1, wherein the cylinder is formed by butt-jointing a first cylinder and a second cylinder;
a first flange is formed on the outer side of the butt joint end of the first cylinder;
a second flange is formed on the outer side of the butt joint end of the second cylinder;
the front side of the first flange is provided with a plug;
a stepped hole is formed in the butt joint end of the second cylinder; the plug extends into the stepped hole;
the first flange and the second flange are arranged oppositely and at intervals, the first flange and the second flange are penetrated through by bolts, and the bolts are used for changing the distance between the first flange and the second flange so as to change the volume of the cavity surrounded by the first barrel and the second barrel and further compact a soil sample in the cavity.
5. The testing device for testing the expansion coefficient of soil property according to claim 4, wherein a spring is provided between the first flange and the second flange.
6. The testing apparatus for testing the expansion coefficient of soil according to claim 5, wherein the spring is sleeved on the bolt.
7. The testing apparatus for testing the expansion coefficient of soil property according to claim 1, wherein the pressing mechanism includes an oil cylinder;
the oil cylinder is fixed on the cylinder body, a push plate is arranged at the end part of a telescopic rod of the oil cylinder, and the push plate is used for pushing the pressure plate.
8. The testing apparatus for testing the expansion coefficient of soil according to claim 7, wherein said displacement detecting means is a distance sensor disposed on a side of said cylinder facing said platen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910680835.9A CN110596344B (en) | 2019-07-26 | 2019-07-26 | Test device for testing expansion coefficient of soil texture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910680835.9A CN110596344B (en) | 2019-07-26 | 2019-07-26 | Test device for testing expansion coefficient of soil texture |
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| CN110596344A true CN110596344A (en) | 2019-12-20 |
| CN110596344B CN110596344B (en) | 2022-08-02 |
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| CN201910680835.9A Active CN110596344B (en) | 2019-07-26 | 2019-07-26 | Test device for testing expansion coefficient of soil texture |
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| CN103149341A (en) * | 2013-02-04 | 2013-06-12 | 辽宁工程技术大学 | Consolidation and penetration measuring device |
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2019
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| CN103149341A (en) * | 2013-02-04 | 2013-06-12 | 辽宁工程技术大学 | Consolidation and penetration measuring device |
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| US20160356685A1 (en) * | 2015-06-03 | 2016-12-08 | Ramesh Chandra Gupta | Test Device For Determining Three-Dimensional Consolidation Properties Of Soils |
| CN206248657U (en) * | 2016-12-13 | 2017-06-13 | 三峡大学 | A kind of use CBR device for surveying geotechnological expansion rate |
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