CN111735935A - Expansive parameter in-situ testing device for expansive soil - Google Patents
Expansive parameter in-situ testing device for expansive soil Download PDFInfo
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- CN111735935A CN111735935A CN202010724548.6A CN202010724548A CN111735935A CN 111735935 A CN111735935 A CN 111735935A CN 202010724548 A CN202010724548 A CN 202010724548A CN 111735935 A CN111735935 A CN 111735935A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention belongs to the field of soil layer measurement, and discloses an expansive parameter in-situ testing device for expansive soil. A plurality of water injection pipe mounting holes are formed in the upper top plate; one end of each water injection pipe is respectively connected with a plurality of water injection pipe mounting holes, and the side wall of the other end of each water injection pipe is provided with a plurality of water injection holes; the end part of one end of the water injection pipe connecting with the water injection pipe mounting hole is opened; one end of each displacement meter is connected with the counter-force disc, and the other end of each displacement meter is connected with the upper top disc. Set up top dish and a plurality of water injection pipe, and then fix testing arrangement in normal position inflation soil layer through a plurality of water injection pipes, make the water injection pipe play fine anchor effect because the soil layer inflation when the water injection, simultaneously, the counterforce dish laminates with inflation soil layer surface, and the displacement volume through measuring the counterforce dish represents the inflation volume on inflation soil layer, realizes the normal position measurement of inflation soil layer expansibility parameter for the measured value is close actual conditions as far as possible.
Description
Technical Field
The invention belongs to the field of soil layer measurement, and relates to an in-situ testing device for expansibility parameters of expansive soil.
Background
The atmospheric influence depth refers to the effective depth of the soil which is caused by precipitation, evaporation, ground temperature and other factors to lift and deform under the action of natural climate. The expansive soil layer in the range is easily influenced by the environment and has great influence on engineering, so that the definition of the expansibility parameter of the expansive soil layer in the atmospheric influence depth is very important for the design of a building structure. The current expansive soil layer expansibility parameters are basically measured in a laboratory, namely after a soil sample is taken out by drilling, the expansibility parameters are actually measured under the conditions of soaking saturation and limiting the deformation of the soil sample.
Although this method is simple and easy to implement, it is for the following reasons: 1. disturbance exists in the soil sample, and expansion deformation is released to some extent; 2. the indoor test is a test by taking a partition sampling mode and cannot completely represent the whole soil layer; 3. the water content of the soil sample caused by full soaking saturation and field soaking penetration is different; 4. indoor deformation is a lateral limit condition, and in-situ deformation is a three-dimensional stress state; 5. the indoor test cannot obtain the accurate processes of soil body humidification deformation and expansion force deformation; often resulting in large differences in measured values of the dilatancy parameter from field practices.
Disclosure of Invention
The invention aims to overcome the defect that the measured value of the expansive parameter in the prior art is often greatly different from the actual situation on site, and provides an in-situ testing device for the expansive parameter of the expansive soil.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
in one aspect of the present invention, an in-situ testing apparatus for expansive parameters of expansive soil comprises:
the upper top disc is provided with a plurality of water injection pipe mounting holes;
one end of each water injection pipe is connected with the corresponding water injection pipe mounting hole, and the side wall of the other end of each water injection pipe is provided with the corresponding water injection hole; the water injection pipe is connected with an opening at one end part of the water injection pipe mounting hole;
a counterforce disk; and
one ends of the displacement meters are connected with the counter-force disc, and the other ends of the displacement meters are connected with the upper top disc;
when in use state: one ends of the water injection pipes, which are far away from the upper top disc, are inserted into an expansion soil layer, the counter-force disc is positioned between the upper top disc and the surface of the expansion soil layer, and the surface of the counter-force disc is attached to the surface of the expansion soil layer; the displacement meter is used for measuring the displacement of the reaction force disc.
The test device of the invention is further improved in that:
the distance between two adjacent water injection holes is gradually enlarged in the direction away from the upper top plate.
Further comprising: one end of the water pumping pipe penetrates through the counter-force plate to be connected with a water pumping pipe mounting hole formed in the upper top plate, and a plurality of water pumping holes are formed in the other end of the water pumping pipe; one end parts of the water pumping pipe and the water pumping pipe mounting hole are opened; when in use state: and one end of the water pumping pipe, which is far away from the upper top plate, is inserted into the expansion soil layer.
The distance between two adjacent pumping holes is gradually reduced in the direction of keeping away from the upper top plate.
The diameter of the counterforce disc is larger than the atmospheric influence depth.
Further comprising: a plurality of moisture sensors; when in use state: the moisture sensors are arranged in the expansive soil layer below the reaction disc at intervals from top to bottom.
The end part of one end of the plurality of water injection pipes, which is far away from the upper top plate, is set to be a tip.
In another aspect of the present invention, an in-situ testing apparatus for expansive parameters of expansive soil comprises:
the upper top disc is provided with a plurality of water injection pipe mounting holes;
one end of each water injection pipe is connected with the corresponding water injection pipe mounting hole, and the side wall of the other end of each water injection pipe is provided with the corresponding water injection hole; the water injection pipe is connected with an opening at one end part of the water injection pipe mounting hole;
a counterforce disk;
one ends of the displacement meters are connected with the counter-force disc, and the other ends of the displacement meters are connected with the upper top disc; and
one end of the spring assembly is connected with the counterforce disc, and the other end of the spring assembly is connected with the upper top disc;
when in use state: the water injection pipe is characterized in that one end, far away from the upper top disc, of each water injection pipe is inserted into an expansion soil layer, the counter-force disc is located between the upper top disc and the surface of the expansion soil layer, the surface of the counter-force disc is attached to the surface of the expansion soil layer, and the displacement meter is used for measuring the displacement of the counter-force disc.
The test device of the invention is further improved in that:
further comprising: one end of the water pumping pipe penetrates through the counter-force plate to be connected with a water pumping pipe mounting hole formed in the upper top plate, and a plurality of water pumping holes are formed in the other end of the water pumping pipe; one end parts of the water pumping pipe and the water pumping pipe mounting hole are opened; when in use state: and one end of the water pumping pipe, which is far away from the upper top plate, is inserted into the expansion soil layer.
The spring assembly comprises a plurality of springs, one ends of the springs are connected with the counter-force disc, and the other ends of the springs are connected with the upper top disc.
Compared with the prior art, the invention has the following beneficial effects:
through setting up the top dish, set up a plurality of water injection pipe mounting holes on the top dish, it is fixed with a plurality of water injection pipes through a plurality of water injection pipe mounting holes, then install a plurality of water injection pipes inside normal position inflation soil layer, because the inflation soil inflation makes the water injection pipe play fine anchor effect when the water injection, and simultaneously, counter-force dish and the laminating of inflation soil layer surface, the displacement volume sign inflation soil layer's of counter-force dish expansion volume is measured to the displacement meter through setting up, realize the normal position measurement of inflation soil layer expansibility parameter, need not gather the soil sample back the laboratory and measure, the laboratory has effectively been overcome and has measured various defects, make the measured value be close to actual conditions as far as possible. Meanwhile, a plurality of displacement meters are arranged, the expansion amount is calculated according to the mean value of the displacement meters, and the measurement error is effectively reduced.
Furthermore, the plurality of water injection holes are far away from the direction of the upper top plate, and the distance between every two adjacent water injection holes is gradually enlarged to fully simulate the gradual infiltration condition of actual precipitation, so that the measured expansibility parameter is closer to the actual condition.
Further, still include the drinking-water pipe, on the one hand, through the suction effect of drinking-water pipe for inflation soil layer central authorities keep certain negative pressure, make the water of water injection pipe injection into can the internal seepage flow of quick inflation soil, make the inflation soil layer saturate that soaks fast, shorten test time, improve work efficiency. On the other hand, the design of the water pumping pipe effectively prevents water from seeping into the soil body below the atmospheric influence depth, so that the measuring result has errors, water is enabled to saturate the expansive soil layer within the atmospheric influence depth as far as possible, and the measuring error is reduced as far as possible.
Furthermore, a plurality of draw water holes are keeping away from in the direction of going up the head dish, and the interval between two adjacent draw water holes reduces gradually, plays the effect that lets water only saturate the expanded soil layer within the atmospheric influence degree of depth as far as possible.
Further, the diameter of the counterforce disc is larger than the atmospheric influence depth. The excessive small size can cause severe stress concentration on the edge of the reaction disc, and the force can damage the test soil body, so that the measurement fails. When the diameter in the horizontal direction is larger than the depth in the vertical direction, the stress concentration in the case is considered to be weaker in engineering practice, and the measurement is normally carried out.
Further, still include a plurality of moisture sensor, can obtain the current moisture content of each degree of depth position in the inflation soil layer in real time through moisture sensor to carry out the combination statistics and the analysis between moisture content and the expansibility parameter, simultaneously, learn current inflation soil layer and whether saturated that soaks.
Furthermore, one end of each water injection pipe far away from the upper top plate is arranged to be a tip, so that the water injection pipes can be conveniently fixed in the expanded soil layer.
Furthermore, still set up spring unit, spring unit one end is connected the counter-force dish, the other end is connected go up the top dish, through the displacement volume of counter-force dish and spring unit's coefficient of stiffness, can calculate the expansive force size that obtains the inflation soil layer, and then realize the normal position expansive force measurement on inflation soil layer.
Drawings
FIG. 1 is a front view of a testing device in a first embodiment of the present invention;
FIG. 2 is a front view of a testing device in a second embodiment of the present invention;
FIG. 3 is a top view of a testing device in a second embodiment of the present invention.
Wherein: 1-a bolt; 2-top disc up; 3-water injection pipe; 4-a displacement meter; 5-a spring; 6-counterforce disk; 7-a water pumping pipe; 8-water injection hole; 9-water pumping holes; 10-moisture sensor.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in a first embodiment of the invention, an in-situ testing device for expansibility parameters of expansive soil is disclosed, and comprises an upper top disc 2, a plurality of water injection pipes 3, a counterforce disc 6 and a plurality of displacement meters 4. A plurality of water injection pipe mounting holes are formed in the upper top plate 2; one end of each water injection pipe 3 is connected with a plurality of water injection pipe mounting holes, and the side wall of the other end of each water injection pipe is provided with a plurality of water injection holes 8; the water injection pipe 3 is connected with an opening at one end part of the water injection pipe mounting hole; one end of each displacement meter 4 is connected with the corresponding reaction disc 6, and the other end of each displacement meter is connected with the upper top disc 2. And, in the use state: one ends of the water injection pipes 3, which are far away from the upper top disc 2, are inserted into an expansive soil layer, the counter-force disc 6 is positioned between the upper top disc 2 and the surface of the expansive soil layer, and the surface of the counter-force disc 6 is attached to the surface of the expansive soil layer; the displacement meter 4 is arranged to measure the displacement of the reaction plate 6.
Specifically, water injection pipe 3 and water injection pipe mounting hole can carry out fixed connection through bolt 1, and hollow steel pipe is generally chooseed for use to water injection pipe 3, through terminating water supply equipment at the opening to inflation soil layer water injection. In this embodiment, the water injection pipe mounting hole has set up 6, and along the outer circumference evenly distributed of last top dish 2, nevertheless not so limit, other quantity and the mode of arranging also can, simultaneously, 6 water injection pipes 3 have also been designed to adaptability, and the mode of evenly arranging is in order to guarantee that the inflation soil layer water injection is even.
Meanwhile, the expansion soil body expands when meeting water in the water injection process, the expansion force can extrude the water injection pipe 3, enough pressure is helpful for anchoring equipment, and the water injection pipe 3 plays an anchoring role in water injection.
Preferably, the water injection holes 8 are arranged in a close-top and sparse-bottom manner, that is, the distance between every two adjacent water injection holes 8 is gradually increased in the direction away from the upper top plate 2, so that the gradual infiltration condition of actual precipitation is fully simulated, and the measured expansibility parameter is closer to the actual condition.
Preferably, the water pumping device further comprises a water pumping pipe 7, one end of the water pumping pipe 7 penetrates through the reaction disc 6 to be connected with a water pumping pipe mounting hole formed in the upper top disc 2, and a plurality of water pumping holes 9 are formed in the other end of the water pumping pipe 7; the end parts of the water pumping pipe 7 and one end part of the water pumping pipe mounting hole are open; when in use state: and one end of the water pumping pipe 7, which is far away from the upper top plate 2, is inserted into an expansion soil layer.
On the one hand, through the suction effect of drinking-water pipe 7 for inflation soil layer central authorities keep certain negative pressure, make the water of water injection pipe 3 injection can the internal seepage flow of quick inflation soil, make the inflation soil layer saturate that soaks fast, shorten test time, improve work efficiency. In the embodiment, the water pumping pipes 7 are arranged in the middle of the water injection pipes 3, so that negative pressure in the expansive soil layer is uniform, seepage speeds in all directions are approximately equal, the seepage speed is close to the actual rainfall seepage condition as much as possible, and the accuracy of a measurement result is improved.
On the other hand, the design of the water pumping pipe 7 effectively prevents water from seeping into the soil body below the atmospheric influence depth, so that the measuring result has errors, water is enabled to saturate the expansive soil layer within the atmospheric influence depth as far as possible, and the errors between the measuring result and the actual situation are reduced as far as possible.
Preferably, the plurality of water pumping holes 9 are far away from the upper top plate 2, and the distance between every two adjacent water pumping holes 9 is gradually reduced, so that the water is saturated as far as possible, and the expanded soil layer within the depth is influenced.
Preferably, the reaction plate 6 has a diameter larger than the atmospheric influence depth,
too small a dimension can cause severe stress concentration at the edge of the reaction disc, which can damage the test soil and cause test failure. When the diameter in the horizontal direction is larger than the depth in the vertical direction, the stress concentration in the case is considered weak in engineering practice, so the design is adopted.
Preferably, a plurality of moisture sensors 10 are also included; when in use state: the moisture sensors 10 are arranged in the expansive soil layer below the reaction disc 6 at intervals from top to bottom. The current water content of each depth position in the expansive soil layer can be obtained in real time through the water sensor 10, so that the combination statistics and analysis between the water content and the expansibility parameter can be carried out, and meanwhile, whether the current expansive soil layer is saturated or not can be known.
Preferably, the end part of one end of the plurality of water injection pipes 3 far away from the upper top plate 2 is set to be a tip, so that the water injection pipes 3 are conveniently fixed in an expanded soil layer.
The specific working process of the expansive parameter in-situ testing device for expansive soil of the embodiment is described by taking an expansive soil layer with atmospheric influence depth as an example, the test object is a cylindrical expansive soil body surrounded by the water injection pipe 3 and an atmospheric influence depth surface, the height of the cylindrical expansive soil body is the atmospheric influence depth, and the bottom area is the area of the reaction disc 6. In addition, in order to reduce the influence of the boundary effect, the diameter of the device is larger than the atmospheric influence depth, and the test soil body is a flat cylinder:
step 1: selecting a proper test field, drilling holes with the depth about the atmospheric influence depth and the diameter about the diameter of the water pumping pipe 7 by using drilling equipment, wrapping the moisture sensors 10 by using in-situ expansive soil, actually measuring the dry density of the moisture sensors, and placing one moisture sensor 10 in each section of distance in a drill hole; and placing the water pumping pipe 7 into the drilled hole, backfilling expansive soil and compacting.
Step 2: the method comprises the following steps of driving a plurality of water injection pipes 3 according to a preset arrangement mode, installing a top disc 2, fixing the water injection pipes 3 by bolts 1, installing a displacement meter 4 and a counter-force disc 6, and enabling the counter-force disc 6 to be tightly attached to the surface of an expansive soil layer.
And step 3: the upper top plate 2 is mounted.
And 4, step 4: the water injection pipe 3 is connected with a water supply device, the water suction pipe 7 is connected with a water pumping device, and the displacement meter 4 is zeroed.
And 5: and (3) switching on a power supply to enable the water pumping equipment and the water supply equipment to start working, recording the readings of the moisture sensor 10 and the displacement meter 4 at all times, finishing the data after the test, and calculating the corresponding expansion amount of the expansive soil layer according to the average value of the readings of the displacement meter 4 at all times and the area of the reaction disc 6.
In the second embodiment of the invention, the invention discloses an in-situ testing device for the expansibility parameter of expansive soil, which comprises an upper top disc 2, a plurality of water injection pipes 3, a counterforce disc 6, a plurality of displacement meters 4 and a spring assembly. When in use state: the water injection pipes 3 are far away from one ends of the upper top discs 2, the expansion soil layer is inserted into the ends of the upper top discs 2, the reaction force discs 6 are located between the upper top discs 2 and the surface of the expansion soil layer, the surfaces of the reaction force discs 6 are attached to the surface of the expansion soil layer, and the displacement meter 4 is used for measuring the displacement of the reaction force discs 6.
The spring assembly comprises a plurality of springs 5, one ends of the springs 5 are connected with the reaction disc 6, and the other ends of the springs are connected with the upper top disc 2. The spring 5 is a spring with a large stiffness coefficient, and the displacement can be regarded as zero within an error allowable range, so that the expansion force change caused by the deformation of the expansion soil layer is reduced as much as possible.
From the mean representation of the readings of the 4 displacement meters, the magnitude of the expansive force of the expansive soil layer can be obtained by adding a known stiffness coefficient, and the formula is as follows:
wherein F is the expansive force of the expansive soil layer, and k is that of the spring 5The coefficient of stiffness of the steel sheet,
the mean value of the readings of the displacement meter 4.
The specific working process of the expansive parameter in-situ testing device for expansive soil of the embodiment is described by taking an expansive soil layer with atmospheric influence depth as an example, the test object is a cylindrical expansive soil body surrounded by the water injection pipe 3 and an atmospheric influence depth surface, the height of the cylindrical expansive soil body is the atmospheric influence depth, and the bottom area is the area of the reaction disc 6. In addition, in order to reduce the influence of the boundary effect, the diameter of the device is larger than the atmospheric influence depth, and the test soil body is a flat cylinder:
step 1: selecting a proper test field, drilling holes with the depth about the atmospheric influence depth and the diameter about the diameter of the water pumping pipe 7 by using drilling equipment, wrapping the moisture sensors 10 by using in-situ expansive soil, actually measuring the dry density of the moisture sensors, and placing one moisture sensor 10 in each section of distance in a drill hole; and placing the water pumping pipe 7 into the drilled hole, backfilling expansive soil and compacting.
Step 2: the method comprises the following steps of driving a plurality of water injection pipes 3 according to a preset arrangement mode, installing a top disc 2, fixing the water injection pipes 3 by bolts 1, installing a displacement meter 4, a spring assembly and a counter-force disc 6, and enabling the counter-force disc 6 to be tightly attached to the surface of an expansive soil layer.
And step 3: the upper top plate 2 is mounted.
And 4, step 4: the water injection pipe 3 is connected with a water supply device, the water suction pipe 7 is connected with a water pumping device, and the displacement meter 4 is zeroed.
And 5: and (3) switching on a power supply to enable the water pumping equipment and the water supply equipment to start working, recording the readings of the moisture sensor 10 and the displacement meter 4 at various moments and finishing the data after the test.
Step 6: the average value of the displacement amounts at respective times recorded by the displacement meter 4
According to the formula
The expansive force of the expansive soil layer at each moment can be converted.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An in-situ testing device for expansibility parameters of expansive soil is characterized by comprising:
the water injection pipe is characterized by comprising an upper top plate (2), wherein a plurality of water injection pipe mounting holes are formed in the upper top plate (2);
the water injection pipe comprises a plurality of water injection pipes (3), wherein one ends of the water injection pipes (3) are respectively connected with a plurality of water injection pipe mounting holes, and the side wall of the other end of each water injection pipe (3) is provided with a plurality of water injection holes (8); the water injection pipe (3) is connected with an opening at one end part of the water injection pipe mounting hole;
a reaction force plate (6); and
one ends of the displacement meters (4) are connected with the reaction disc (6), and the other ends of the displacement meters (4) are connected with the upper top disc (2);
when in use state: one ends of the water injection pipes (3) far away from the upper top disc (2) are inserted into an expansion soil layer, the counter force disc (6) is positioned between the upper top disc (2) and the surface of the expansion soil layer, and the surface of the counter force disc (6) is attached to the surface of the expansion soil layer; the displacement meter (4) is used for measuring the displacement of the counterforce disc (6).
2. The expansive parameter in-situ test device for expansive soil according to claim 1, wherein the plurality of water injection holes (8) are gradually enlarged in the direction away from the upper top plate (2), and the distance between two adjacent water injection holes (8) is gradually enlarged.
3. The apparatus for in-situ testing of expansive parameters of expansive soil of claim 1, further comprising:
one end of the water pumping pipe (7) penetrates through the reaction disc (6) to be connected with a water pumping pipe mounting hole formed in the upper top disc (2), and a plurality of water pumping holes (9) are formed in the other end of the water pumping pipe (7); the end parts of the water pumping pipe (7) and one end part of the water pumping pipe mounting hole are open;
when in use state: one end, far away from the upper top plate (2), of the water pumping pipe (7) is inserted into an expansion soil layer.
4. The expansive parameter in-situ test device for expansive soil according to claim 3, wherein the distance between two adjacent pumping holes (9) is gradually reduced in the direction away from the upper top plate (2) of the plurality of pumping holes (9).
5. The apparatus for in-situ testing of expansive parameters of expansive soil of claim 1, wherein the reaction disc (6) has a diameter greater than the atmospheric influence depth.
6. The apparatus for in-situ testing of expansive parameters of expansive soil of claim 1, further comprising:
a number of moisture sensors (10);
when in use state: the moisture sensors (10) are arranged in the expansive soil layer below the reaction disc (6) at intervals from top to bottom.
7. The expansive parameter in-situ test device of expansive soil according to claim 1, wherein the end of the plurality of water injection pipes (3) far away from the upper top plate (2) is provided with a tip.
8. An in-situ testing device for expansibility parameters of expansive soil is characterized by comprising:
the water injection pipe is characterized by comprising an upper top plate (2), wherein a plurality of water injection pipe mounting holes are formed in the upper top plate (2);
the water injection pipe comprises a plurality of water injection pipes (3), wherein one ends of the water injection pipes (3) are respectively connected with a plurality of water injection pipe mounting holes, and the side wall of the other end of each water injection pipe (3) is provided with a plurality of water injection holes (8); the water injection pipe (3) is connected with an opening at one end part of the water injection pipe mounting hole;
a reaction force plate (6);
one ends of the displacement meters (4) are connected with the reaction disc (6), and the other ends of the displacement meters (4) are connected with the upper top disc (2); and
one end of the spring assembly is connected with the reaction disc (6), and the other end of the spring assembly is connected with the upper top disc (2);
when in use state: the water injection pipe is characterized in that one end, far away from the upper top disc (2), of each water injection pipe (3) is inserted into an expansion soil layer, the counter force disc (6) is located between the upper top disc (2) and the surface of the expansion soil layer, the surface of the counter force disc (6) is attached to the surface of the expansion soil layer, and the displacement meter (4) is used for measuring displacement of the counter force disc (6).
9. The apparatus for in-situ testing of expansive parameters of expansive soil of claim 8, further comprising:
one end of the water pumping pipe (7) penetrates through the reaction disc (6) to be connected with a water pumping pipe mounting hole formed in the upper top disc (2), and a plurality of water pumping holes (9) are formed in the other end of the water pumping pipe (7); the end parts of the water pumping pipe (7) and one end part of the water pumping pipe mounting hole are open;
when in use state: one end, far away from the upper top plate (2), of the water pumping pipe (7) is inserted into an expansion soil layer.
10. The expansive parameter in-situ test device for expansive soil according to claim 8, wherein the spring assembly comprises a plurality of springs (5), one ends of the springs (5) are connected with the counterforce disk (6), and the other ends of the springs are connected with the upper top disk (2).
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| CN202010724548.6A CN111735935A (en) | 2020-07-24 | 2020-07-24 | Expansive parameter in-situ testing device for expansive soil |
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| CN202010724548.6A CN111735935A (en) | 2020-07-24 | 2020-07-24 | Expansive parameter in-situ testing device for expansive soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858633A (en) * | 2021-01-14 | 2021-05-28 | 三门峡职业技术学院 | Large-thickness collapsible loess humidifying deformation experimental device |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858633A (en) * | 2021-01-14 | 2021-05-28 | 三门峡职业技术学院 | Large-thickness collapsible loess humidifying deformation experimental device |
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