CN217466043U - Soil body horizontal stress testing device and system based on flexible consolidation pressure chamber - Google Patents
Soil body horizontal stress testing device and system based on flexible consolidation pressure chamber Download PDFInfo
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- CN217466043U CN217466043U CN202122455814.2U CN202122455814U CN217466043U CN 217466043 U CN217466043 U CN 217466043U CN 202122455814 U CN202122455814 U CN 202122455814U CN 217466043 U CN217466043 U CN 217466043U
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Abstract
The utility model discloses a soil body horizontal stress testing arrangement and system based on flexible consolidation pressure chamber for test its horizontal pressure when the soil body test block receives vertical load, the device includes: the device comprises a base, a sleeve, a first strain gauge, a second strain gauge, a pressure head, a loading plate and a PC end; the base is provided with a sleeve; the sleeve is in a straight tube shape, the top and the bottom of the sleeve are both open, the bottom opening of the sleeve is arranged on the base, and a soil test block is arranged in the sleeve; the first strain gauge and the second strain gauge are correspondingly arranged on the circumferential outer wall of the sleeve and are positioned at the same radial position, and the first strain gauge and the second strain gauge are connected through a double-arm bridge; the pressure head is arranged at the top of the sleeve and used for applying pressure to the soil test block in the sleeve; the loading plate is arranged at the top of the sleeve and is positioned between the pressure head and the soil test block; and the PC end is connected with the first strain gauge and the second strain gauge and is used for acquiring the horizontal pressure on the soil test block. Can be widely applied to the technical field of geotechnical engineering.
Description
Technical Field
The utility model belongs to the technical field of ground comprehensive testing, in particular to soil body horizontal stress testing arrangement and system based on flexible consolidation pressure chamber.
Background
At present, under the action of vertical load, the soil body transfers the force with a large numerical value in the horizontal direction, and the horizontal force transfer proportion and the property of different soils are different through the reaction of the K0 coefficient. In the traditional consolidation test and instrument, the experimental soil sample is placed in the cutting ring and only can measure the vertical load, and the horizontal force transfer load value cannot be measured due to the fact that the cutting ring is high in rigidity. Therefore, the prior art lacks a testing device which can accurately measure the magnitude of the horizontal transmission load value under the action of the vertical load.
Therefore, the loading and measurement of different soil bodies by the cutting ring in the prior art can only test the vertical load of the soil body, and the force of which numerical value is transmitted in the horizontal direction cannot be tested under the action of the vertical load;
that is, how to test the horizontal load force of the soil body under the action of the vertical load is a technical problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem how to provide a soil body horizontal stress testing arrangement based on flexible consolidation pressure chamber to solve above-mentioned partial technical problem at least.
For at least solving above-mentioned partial technical problem, the first aspect, the utility model provides a soil body horizontal stress testing arrangement based on flexible consolidation pressure chamber for test its horizontal pressure when the soil body test block receives vertical load, its characterized in that, the device includes: the device comprises a base, a sleeve, a first strain gauge, a second strain gauge, a pressure head, a loading plate and a PC end; the sleeve is arranged on the base; the sleeve is in a straight tube shape, the top and the bottom of the sleeve are both open, the bottom opening of the sleeve is arranged on the base, and the soil test block is contained in the sleeve; the first strain gauge and the second strain gauge are correspondingly arranged on the circumferential outer wall of the sleeve and are positioned at the same radial position, and the first strain gauge and the second strain gauge are connected through a double-arm bridge; the pressure head is arranged at the top of the sleeve and used for applying pressure to the soil test block in the sleeve; and the PC end is connected with the first strain gauge and the second strain gauge and is used for acquiring the horizontal pressure applied to the soil test block.
In a first aspect, the double arm bridge is of a wheatstone bridge type.
In a first aspect, the sleeve comprises a can.
In a first aspect, the apparatus further comprises:
and the millivolt multimeter is connected with the double-arm bridge and is used for recording the voltage of the double-arm bridge in real time.
In a first aspect, the ram is a hydraulic ram.
In the first aspect, the test apparatus further comprises: the power transmission device is arranged between the pressure head and the loading plate and comprises: a plurality of balls.
In the first aspect, the loading plate is provided with a plurality of recesses on the upper surface, and the recesses are used for placing the balls.
In the first aspect, a plurality of water permeable pores are uniformly distributed on the base.
In the first aspect, the test apparatus further comprises: the filter sheet is arranged on the opening at the bottom of the sleeve, is attached to the base and is used for filtering water seeped from the soil mass test block when the soil mass test block is accommodated in the sleeve and is in contact with the filter sheet.
In a second aspect, the present invention provides a testing system, which comprises a soil horizontal stress testing device based on a flexible consolidation pressure chamber as described in any one of the above.
Has the advantages that:
the utility model provides a pair of soil body horizontal stress testing arrangement based on flexible consolidation pressure chamber, through setting up first foil gage and second foil gage at the sleeve lateral wall, then after the soil body test block that will carry out the test is arranged in the sleeve, set up a pressure head and press the top of establishing to the soil body test block, and apply vertical pressure to the soil body test block, make the soil body test block cause the oppression to warp to telescopic lateral wall after taking place to deform, and then the numerical value that warp through first foil gage and second foil gage test sleeve is in order to judge the soil body test block under vertical load effect, the power of the most numerical value of horizontal direction transmission, for making this test data more accurate, pass through a both arms electric bridge intercommunication PC end with first foil gage and second foil gage, make the process at the test can real time monitoring, and can in time preserve the test data in the PC end after the test, and then reach and provide technical scheme to how to test its horizontal load power under the effect that receives vertical load when the soil body, and how to provide Technical object of reference.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a soil horizontal stress testing device based on a flexible consolidation pressure chamber according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a wheatstone bridge model provided in the first embodiment;
reference numerals:
1. a base;
2. a filter disc;
3. soil mass samples;
4. a loading plate;
5. a sleeve;
6. a first strain gauge;
7. a pressure head;
8. and a second strain gage.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification belong to the protection scope of the present invention.
Meanwhile, in the embodiments of the present description, when an element is referred to as being "fixed to" another element, it may be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used in the embodiments of the present description are for illustrative purposes only and are not intended to limit the present invention.
The first embodiment is as follows:
please refer to fig. 1-2, an embodiment of the present invention provides a soil body horizontal stress testing device based on flexible consolidation pressure chamber for testing the horizontal pressure when the soil body test block receives the vertical load, wherein the device includes: the device comprises a base 1, a sleeve 5, a first strain gauge 6, a second strain gauge 8, a pressure head 7, a loading plate 4 and a PC end; the sleeve 5 is arranged on the base 1; the sleeve 5 is in a straight tube shape, the top and the bottom of the sleeve 5 are both open, the bottom opening of the sleeve 5 is arranged on the base 1, and the soil test block is contained in the sleeve 5; the first strain gauge 6 and the second strain gauge 8 are correspondingly arranged on the circumferential outer wall of the sleeve 5 and are located at the same radial position, and the first strain gauge 6 and the second strain gauge 8 are connected through a double-arm bridge; the pressure head 7 is arranged at the top of the sleeve 5 and is used for applying pressure to the soil test block in the sleeve 5; the PC end is connected with the first strain gauge 6 and the second strain gauge 8 and is used for acquiring the horizontal pressure connection applied to the soil body test block; the pressure head 7 is arranged at the top of the sleeve 5 and used for applying pressure to the soil test block in the sleeve 5; and the PC end is connected with the first strain gauge 6 and the second strain gauge 8 and is used for acquiring the horizontal pressure applied to the soil test block.
Based on the technical scheme in the first embodiment, the first strain gauge 6 and the second strain gauge 8 are arranged on the outer side wall of the sleeve 5, then after a soil mass test block to be tested is placed in the sleeve 5, the pressure head 7 is arranged to be pressed to the top of the soil mass test block, vertical pressure is applied to the soil mass test block, compression deformation is caused to the outer side wall of the sleeve 5 after the soil mass test block is deformed, the deformed numerical value of the sleeve 5 is tested through the first strain gauge 6 and the second strain gauge 8 so as to judge that the soil mass test block transmits the force of most numerical values in the horizontal direction under the action of vertical load, in order to enable the test data to be more accurate, the first strain gauge 6 and the second strain gauge 8 are communicated with the PC end through the double-arm bridge, the test process can be monitored in real time, the test data can be timely stored at the PC end after the test, and the technical reference for providing technical reference for how the horizontal load force of the soil mass is tested under the action of vertical load is further achieved The purpose is.
In the first embodiment, the first strain gage 6 and the second strain gage 8 are connected by a double bridge, and the first embodiment may further include: the first strain gage 6 and the second strain gage 8 are connected by a wheatstone bridge type double-arm bridge, which is known to be used for accurately measuring the resistance value of an unknown resistor, and the principle of the double-arm bridge is similar to that of an original potentiometer. There is a resistance of unknown resistance value and a variable resistor, resistance and resistance of known resistance. In one circuit, the sum is connected in series and in series, the two series circuits are connected in parallel, the wire midpoint between the sum and the wire midpoint between the sums are connected to a wire, and a galvanometer is placed on the wire. At that time, no current will pass through the intermediate wires. Since it is very sensitive whether or not a current is flowing, the wheatstone bridge can obtain rather accurate measurements.
Further, in order to have a more intuitive way of detecting the voltages monitored by the first strain gauge 6 and the second strain gauge 8 accurately, the present embodiment proposes an implementation manner, which includes: after the first strain gauge 6 and the second strain gauge 8 are connected through the double-arm bridge, a millivolt multimeter is connected with the double-arm bridge to record the voltage of the double-arm bridge in real time.
As for the sleeve 5 in the first embodiment, as an implementation manner of the sleeve 5, the pop-top can is made into a straight cylinder shape with an open top and an open bottom to serve as the sleeve 5 for accommodating the soil test block, and the pop-top can has strong plasticity and lower rigidity than that of a cutting ring, and can better adapt to an experimental manner of deforming the pop-top can in the horizontal direction by vertical pressure in the first embodiment.
For applying the vertical pressure to the soil test block through the pressure head 7, the method can also comprise the steps of applying the vertical pressure to the soil test block through the hydraulic pressure head 7 and applying the vertical pressure to the soil test block through the electric telescopic device.
In order to make the force transmission of the indenter 7 on the soil mass test block more stable, the first embodiment proposes an implementation manner, which includes that before the vertical pressure is applied to the soil mass test block by the indenter 7, a force transmission device is disposed between the indenter 7 and the loading plate 4, and the disposing of the force transmission device between the indenter 7 and the loading plate 4 includes: the pressure head 7 and the loading plate 4 are provided with a plurality of balls, so that when the pressure head 7 applies pressure to the loading plate 4, the loading plate 4 can transfer force to the balls, and the balls and the loading plate 4 have certain rolling friction, so that the transfer has certain toughness, and the stability of the pressure applied to the soil test block by the pressure head 7 to the loading plate 4 is further ensured.
Further, in order to prevent the balls from generating large rolling friction on the loading plate 4, which may cause excessive misalignment or disengagement of the pressing head 7 from the loading plate 4, the first embodiment proposes an implementation manner to solve the above problem, which includes: the upper surface of the loading plate 4 is provided with a plurality of recesses for placing the balls, and it should be noted that the depth of the recesses only plays a role in preventing the balls from freely rolling on the loading plate 4, but cannot play a role in preventing the balls from rolling when external force is applied.
Before the step of fixing the sleeve 5 and the base 1, it should be considered that the water content inside the soil test block needs to be selected to have toughness and a certain looseness inside the soil, so when the pressure head 7 presses the soil sample 3, the water inside the soil sample 3 is pressed out into the sleeve 5, and in order to prevent the water containing the soil sample 3 from accumulating in the sleeve 5 and being unable to be discharged, and further to influence the normal compression amount inside the sleeve, the second embodiment provides a technical scheme to solve the technical problems, and the technical scheme includes: firstly, a plurality of water permeable holes are arranged on the base 1 to lead out the water leaked when the soil body sample 3 is pressed.
Further, the size of the upper water permeable pores is set to 0.5 to 0.8mm to accommodate filtration of moisture containing impurities of normal particle size.
Furthermore, for the water led out to the inside of the sleeve 5, the water contains the pollutants of the soil body test block 3, in order to avoid the particles in the water containing the pollutants from blocking the water through holes on the base 1, a filter sheet 2 is arranged on the base 1, and a filter sheet 2 is arranged right above the water through holes of the filter sheet 2, and is used for filtering the water seeped from the soil body test block when the soil body test block is accommodated in the sleeve 5 and is in contact with the filter sheet 2.
Meanwhile, because the soil body has toughness and deformation uncertainty, the cylinder body is irregularly deformed after being used, subsequent tests are not facilitated, and in order to further correct the sleeve 5 after the tests, the first embodiment provides a test method, which solves the technical problems, and the method comprises the following steps: before the soil test block is arranged in the sleeve 5, a balloon with water in the inner part is arranged in the sleeve 5, the outer wall of the balloon is in contact with the inner wall of the sleeve 5, the balloon is vertically pressed to enable the circumferential outer wall of the balloon to uniformly press the inner wall of the sleeve 5, the side wall of the sleeve 5 is uniformly pressed in a fluid (water) mode, and then the cylinder body is restored to the uniform circumferential diameter.
Regarding the method of placing the soil test block inside the sleeve 5 in the first embodiment, considering that the volume of the pressing head 7 is much smaller than the volume of the soil sample 3, if the pressure is applied normally, a local depression with a fast formula diagram is formed, and thus the technical effect of applying pressure to the soil sample 3 through the pressing head 7 in a balanced manner cannot be achieved, based on this, the first embodiment further provides a solution, and the solution specifically includes: the top of the sleeve 5 is positioned at the lower part of the pressure head 7, the loading plate 4 is arranged, and the circumferential side wall of the loading plate 4 is arranged to be attached to the inner wall of the sleeve 5, so that when the pressure head 7 presses the loading plate 4, pressure is applied to the loading plate 4 through the characteristic that the areas of the loading plate 4 and the top of the soil mass sample 3 are consistent, and then the loading plate 4 vertically acts on the soil mass sample 3, and the technical effect of uniform stress of the soil mass sample 3 is achieved.
In order to further enable the sleeve 5 to be stressed more uniformly when being stressed by pressure, the first embodiment provides a method to solve the technical problem, before the sleeve 5 and the base 1 are fixed, a protruding portion is firstly arranged on the base 1, the circumferential size of the protruding portion is set to be just consistent with the inner diameter of the sleeve 5, and then the bottom of the sleeve 5 is sleeved on the protruding portion, so that the soil mass sample 3 in the sleeve 5 can be stressed by balanced pressure when being stressed, and the test is more accurate.
Because the toughness of the soil body is better, and the rigidity of the side wall of the sleeve 5 is also smaller, the applied pressure is not needed to be too large, if the applied pressure is too large, the side wall of the sleeve 5 is pressed into irreversible deformation or fracturing, the output voltage of the pressure head 7 is set to be 5-10V, and the pressure head 7 can adopt an electric telescopic device or a miniature hydraulic output device.
Based on the step of arranging the loading plate 4 on the top of the sleeve 5 in the first embodiment, in order to make the stress surface on the top of the soil sample 3 more balanced, but the pressure head 7 and the sleeve 5 are in direct rigid fit, and there is no transition device between the two for matching, so as to improve the toughness of the matching connection between the two, the first embodiment provides a method to solve the above technical problem, and the method includes: after the loading plate 4 is arranged at the top of the sleeve 5, the force transmission device is arranged on the loading plate 4, the pressure head 7 is pressed on the force transmission device, and the force transmission device is arranged to be a plurality of solid columnar structures with equal diameters, so that when the loading plate 4 is stressed, the force can be transmitted through the columnar solid structures, the connection toughness between the two is increased, and the stability of the soil mass sample 3 is further increased.
In summary, the invention relates to a testing method of a soil body horizontal pressure testing device based on a film pressure sensor, the method replaces a cutting ring rigid body with a flexible body of a sleeve 5 which is made of the material of a pop-top can, the pop-top can is subjected to uniform radial pressure and tangential tension under the loading action of a certain vertical load value of a sample soil block, the radial and tangential strain of the can body can be ignored due to the extremely strong tensile strength of the can body, so that a soil sample can keep no horizontal deformation, the state is called as a non-lateral limited deformation state, a circle of film stress sensor is pasted along the middle position of the inner surface of the pop-top can, the sample soil block is deformed under the vertical load action, the output end of the film stress sensor records the magnitude of an output voltage value in real time, the magnitude of a horizontal load force transmission value is obtained through a lateral pressure sensor calibration curve, and the magnitude of the horizontal load force transmission value is obtained according to a formula
And the horizontal side pressure coefficient of the sample soil block is calculated, and the method has the advantages of simple test, accurate measurement test data and the like.
The implementation of the above technical effects includes the method steps included in the first embodiment, which further includes the following preparation:
the method comprises the following steps: manufacturing the pop can sleeve 5: a pop can with the diameter of 6-7cm is taken, the bottle bottom and the bottle cap are cut off uniformly along the same horizontal height by scissors, only the middle part is reserved, the height is about 8-10cm, and a circle of film pressure sensor is adhered to the middle position of the inner surface of a pop can sleeve 5.
Step two: preparing a sample soil block: the sample soil block is cylindrical with a certain thickness, the diameter of the sample soil block is equal to that of the pop can sleeve 5, the thickness of the sample soil block is about 2-3cm, and the parallelism and the straightness of the surface and the verticality of the side surface of the sample soil block meet the test requirements.
The parallelism of the surface of the sample soil block is as follows: the upper and lower surfaces of the sample clods should be parallel;
the flatness is as follows: the surface of the sample soil block is vertical to the central axis of the instrument;
the verticality is as follows: the side surfaces of the sample clods should be parallel to the central axis of the instrument.
The thickness of sample soil block can not be too thin, prevents that soil sample lateral wall and easy open can lateral wall contactless unable data acquisition's problem behind the soil sample atress deformation.
Step three: the film pressure sensor is accurately connected with a computer.
Step four: calibrating the lateral pressure sensor: the lower end of a pop can sleeve 5 extends into a base by 112-3cm, a balloon filled with water is placed in the pop can sleeve 5, a loading plate 4 is placed on the upper surface, an external power supply (direct current V) is connected, a vertical load with a certain numerical value is applied through a pressure head 7, the water in the balloon is gradually deformed under the action of the vertical load until the water is close to the side wall of the pop can sleeve 5, the output end of a film pressure sensor records the magnitude of an output voltage value in real time, and a relation graph of the output voltage and horizontal lateral pressure is obtained.
Step five: measurement of sample clod K0 value: laying a layer of filter paper on the upper surface of the base 1, placing a sample soil block on the filter paper, connecting a loading plate 4, the sample soil block and the base 1 into a whole by using a ring of pop-top can sleeve 5 which is stuck to the middle position of the inner surface of the pop-top can sleeve, connecting an external power supply (direct current V), applying a vertical load with a certain numerical value through a pressure head 7, and recording the output end of the film pressure sensor in real timeThe magnitude of the output voltage value is obtained through a calibration curve of the lateral pressure sensor, the magnitude of a horizontal force transfer load value is obtained, and a horizontal lateral pressure coefficient of the sample soil block is calculated according to a formula, wherein the formula is as follows:
the second embodiment:
the invention provides a testing system, which comprises a testing method of the soil body horizontal stress testing device based on the flexible consolidation pressure chamber in any one of the embodiments.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to examples, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a soil body horizontal stress testing arrangement based on flexible consolidation pressure chamber for test its horizontal pressure when the soil body test block receives vertical load, its characterized in that, the device includes:
the device comprises a base, a sleeve, a first strain gauge, a second strain gauge, a pressure head, a loading plate and a PC end;
the sleeve is arranged on the base;
the sleeve is in a straight tube shape, the top and the bottom of the sleeve are both open, the bottom opening of the sleeve is arranged on the base, and the soil body test block is contained in the sleeve;
the first strain gauge and the second strain gauge are correspondingly arranged on the circumferential outer wall of the sleeve and are positioned at the same radial position, and the first strain gauge and the second strain gauge are connected through a double-arm bridge;
the pressure head is arranged at the top of the sleeve and used for applying pressure to the soil test block in the sleeve;
the loading plate is arranged at the top of the sleeve and is positioned between the pressure head and the soil body test block;
and the PC end is connected with the first strain gauge and the second strain gauge and is used for acquiring the horizontal pressure applied to the soil test block.
2. The horizontal soil stress testing device based on the flexible consolidation pressure chamber of claim 1, wherein the double-arm bridge is of Wheatstone bridge type.
3. The soil horizontal stress testing device based on the flexible consolidation pressure chamber of claim 1, wherein the sleeve comprises a pop can.
4. The flexible consolidation pressure chamber based soil horizontal stress testing apparatus of claim 1, wherein the apparatus further comprises:
and the millivolt multimeter is connected with the double-arm bridge and is used for recording the voltage of the double-arm bridge in real time.
5. The soil body horizontal stress testing device based on the flexible consolidation pressure chamber as claimed in claim 1, wherein:
the pressure head is a hydraulic pressure head.
6. The flexible consolidation pressure chamber based soil horizontal stress testing apparatus of claim 1, wherein the testing apparatus further comprises:
the power transmission device is arranged between the pressure head and the loading plate and comprises: a plurality of balls.
7. The soil body horizontal stress testing device based on the flexible consolidation pressure chamber as claimed in claim 6, wherein:
the upper surface of the loading plate is provided with a plurality of depressions, and the depressions are used for placing the balls.
8. The soil body horizontal stress testing device based on the flexible consolidation pressure chamber as claimed in claim 1, wherein:
a plurality of water permeable pores are uniformly distributed on the base.
9. The flexible consolidation pressure chamber based soil horizontal stress testing apparatus of claim 1, wherein the testing apparatus further comprises:
the filter sheet is arranged on the opening at the bottom of the sleeve, is attached to the base and is used for filtering water seeped from the soil mass test block when the soil mass test block is accommodated in the sleeve and is in contact with the filter sheet.
10. A system, characterized by:
the system comprises the soil body horizontal stress testing device based on the flexible consolidation pressure chamber according to any one of claims 1 to 9.
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| CN202122455814.2U CN217466043U (en) | 2021-10-12 | 2021-10-12 | Soil body horizontal stress testing device and system based on flexible consolidation pressure chamber |
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| CN202122455814.2U CN217466043U (en) | 2021-10-12 | 2021-10-12 | Soil body horizontal stress testing device and system based on flexible consolidation pressure chamber |
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