A testing system and comparison method for semi-rigid base deswelling groove filling materials

Abstract

The present invention discloses a testing system and comparison method for filling materials of a semi-rigid base deswelling trough, and relates to the technical field of geotechnical testing instruments. A testing system and comparison method for filling materials of a semi-rigid base deswelling trough, which comprises an insulation box and a temperature control component, wherein the temperature control component comprises a constant temperature liquid bath, and a first specimen temperature control disk, a first filling material temperature control disk, a second filling material temperature control disk, and a second specimen temperature control disk, which are sequentially arranged in the insulation box and connected to the constant temperature liquid bath, respectively; a first specimen placement cavity and a second specimen placement cavity are formed between the first specimen temperature control disk and the first filling material temperature control disk, and between the second specimen temperature control disk and the second filling material temperature control disk, respectively. The present invention can simulate the actual working conditions of high temperature and extreme dryness in the Gobi saline soil area, and test the deformation relief ability of the deswelling trough filling material at different temperatures.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical testing instruments, and in particular to a testing system and a comparison method for semi-rigid base deswelling trough filling materials. Background Art

[0002] The description of the background technology in the invention belongs to the related technology related to the invention and is only used to illustrate and facilitate the understanding of the content of the invention. It should not be understood that the applicant explicitly believes or presumes that the applicant believes that it is the prior art of the invention on the filing date of the first application.

[0003] After a period of use, semi-rigid base asphalt pavement has suffered from common asphalt pavement defects such as reflective cracks, loose peeling, bulging, and rutting. Lateral bulging is caused by the combined effect of temperature and salt in the road structure, which makes it impossible to release the internal stress of cement-stabilized gravel, and the salt expansion of the base and roadbed. At present, the treatment of bulging disease is basically based on the setting method of debulking joints in cement concrete pavement, that is, setting debulking grooves in the base and filling them with flexible asphalt mixture. This countermeasure has alleviated the bulging effect to a certain extent. Salt and temperature are important factors causing the bulging of water-stable base. Setting debulking grooves in the base is a recognized effective measure. In addition, the filling material of the debulking groove is also an important factor affecting the use effect of the debulking groove. At present, the research methods of debulking grooves are mainly focused on constructing test sections and monitoring the temperature, pressure and deformation of the water-stable base on site. However, this method cannot effectively separate the environmental factors in different regions. The process is complicated and time-consuming, and it is easily affected by the external environment. It cannot simulate the actual working conditions of high temperature and extreme dryness in the Gobi saline soil area, as well as the effects of different de-swelling trough filling materials on arch expansion. Summary of the invention

[0004] The purpose of the invention is to provide a semi-rigid base deswelling trough filling material testing system and comparison method to solve the problem that the existing research methods on deswelling troughs are mainly focused on building test sections, which cannot simulate the actual working conditions of high temperature and extreme dryness in the Gobi saline soil area.

[0005] The technical solution of the invention to solve the above technical problems is as follows:

[0006] A semi-rigid base deswelling groove filling material testing system comprises an insulation box and a temperature control component; the temperature control component comprises a constant temperature liquid bath and a first specimen temperature control disk, a first filling material temperature control disk, a second filling material temperature control disk and a second specimen temperature control disk which are sequentially arranged in the insulation box and connected to the constant temperature liquid bath respectively; a first specimen placement cavity and a second specimen placement cavity are formed between the first specimen temperature control disk and the first filling material temperature control disk, and between the second specimen temperature control disk and the second filling material temperature control disk respectively; a deswelling groove is formed between the first filling material temperature control disk and the second filling material temperature control disk; a horizontal displacement measuring piece and a first vertical displacement measuring piece for detecting the deformation degree of the specimen are respectively arranged in the first specimen placement cavity and the second specimen placement cavity; pressure sensors are respectively arranged on the outer sides of the first specimen temperature control disk and the second specimen temperature control disk.

[0007] The beneficial effects of adopting the above technical solution are as follows: two specimens with a certain salt content are prepared in advance, the volumes of the specimens match the corresponding specimen placement cavities, the specimens are placed in the first specimen placement cavity and the second specimen placement cavity respectively, a horizontal displacement measuring piece and a first vertical displacement measuring piece are arranged on the top of the specimen, the first filling material is filled into the deswelling tank, the temperature of the constant temperature liquid bath is set, the corresponding temperature control plate and the placement tank are heated to make the specimen expand due to heat, and the working state of the deswelling tank is observed. At this time, the first thing to consider is the deformation value of the specimen in the horizontal and vertical directions, that is, the observation The deformation values ​​measured by the horizontal displacement measuring device and the first vertical displacement measuring device indicate the amount of deformation of the water-stable base layer allowed by the deswelling groove within its effective range; secondly, observe the pressure generated in the horizontal direction of the specimen, that is, the pressure value measured by the pressure sensor, which indicates the expansion force generated inside the specimen under the action of temperature and salt. At this time, after the data test of the first filling material is completed, replace the second filling material and the specimen, set the temperature to be consistent with the value of the first group of filling materials, repeat the above steps to measure the deformation value and pressure value of the second filling material, and repeat the above steps for subsequent filling materials respectively.

[0008] The test specimens on both sides of the deswelling trough of the technical scheme are used to simulate the semi-rigid base used in the actual construction process. Filling the deswelling trough with different filling materials can simulate the quality test of different deswelling trough filling materials in the actual engineering application of the semi-rigid base. The heating temperature of the test specimen can be adjusted by a constant temperature liquid bath. The technical scheme is simple and easy to implement. Not only can it be tested indoors, but it can also simulate the actual working conditions of high temperature and extreme dryness in the Gobi saline land area to test the deformation relief ability of the deswelling trough filling material at different temperatures. By setting a horizontal displacement measuring piece, a first vertical displacement measuring piece and a pressure sensor, the ability of the filling material to relieve arch expansion at a certain temperature is obtained, thereby providing support for how to select and test the deswelling trough filling material during the work process, and solving the problem that the current filling material research is tested through actual construction of test sections, the project volume is large, and it is easily affected by the environment.

[0009] Furthermore, a distance adjustment component is provided on the outer side of the second specimen temperature control disk. The distance adjustment component is arranged horizontally and is threadedly connected to the insulation box. The distance adjustment component includes a connecting end and an adjusting end. The connecting end extends into the insulation box and is connected to the pressure sensor of the second specimen temperature control disk, and the adjusting end extends out of the insulation box.

[0010] Furthermore, the distance adjustment assembly includes a rotating adjustment rod, a locking piece and a connecting plate connected to the pressure sensor. The rotating adjustment rod is threadedly connected to the insulation box. One end of the rotating adjustment rod extends into the insulation box and is connected to the connecting plate. The other end of the rotating adjustment rod extends out of the insulation box and is sleeved with a locking piece.

[0011] The beneficial effects of adopting the above technical solution are: after placing the test piece in the corresponding placement cavity, the knob rotates the adjustment rod so that the connecting plate is against the corresponding pressure sensor. When the data measured by the pressure sensor returns to zero, the knob locking piece is against the incubator, and the distance between the ends of the two test pieces is fixed. The distance adjustment component provided in this technical solution can adjust the relative distance between the test piece and the incubator, thereby meeting the test requirements of the semi-rigid base with a small lateral width, and the connection between the structures is more compact, which is conducive to the horizontal displacement measuring piece and the first vertical displacement measuring piece to measure the expansion force of the test piece.

[0012] Furthermore, soil pressure boxes for measuring the pressure of the filling materials are respectively arranged on the inner sides of the first filling material temperature control disk and the second filling material temperature control disk, and the soil pressure boxes are respectively electrically connected to stress monitors arranged outside the insulation box, and the pressure sensors are also respectively electrically connected to the stress monitors.

[0013] The beneficial effect of adopting the above technical solution is as follows: since both ends of the specimen will expand due to the arching, the deswelling groove between the two specimens will be subjected to a certain pressure. Earth pressure boxes are respectively arranged on the inner walls of the first filling material temperature control disk and the second filling material temperature control disk, so that the pressure values ​​generated by the two specimens on the deswelling groove can be measured respectively, which can be used as a reference value for the deformation relief capacity of the deswelling groove, and the measured data is more comprehensive.

[0014] Furthermore, a temperature sensor for detecting the temperature in the deswelling tank is arranged in the deswelling tank, and the temperature sensor is electrically connected to a temperature monitor arranged outside the incubator.

[0015] The beneficial effects of adopting the above technical solution are: the temperature sensor is used to detect the temperature in the deswelling groove, the deformation amount and expansion pressure are correlated with the temperature, and the ability of different filling materials to alleviate the arch expansion is evaluated.

[0016] Furthermore, movable bottom plates for supporting the specimens are respectively arranged in the first specimen placement cavity and the second specimen placement cavity, and a plurality of pulleys are respectively arranged at the bottom of the movable bottom plates.

[0017] The beneficial effects of adopting the above technical solution are: since the sample will expand to a certain extent when heated and its volume will increase, the sample is placed on a movable bottom plate. As the temperature rises, the sample expands and the movable bottom plate moves in the corresponding placement cavity, reducing the friction between the sample and the bottom of the insulation box, and obtaining more accurate deformation and pressure values.

[0018] Furthermore, the first specimen temperature control disk, the first filling material temperature control disk, the second filling material temperature control disk and the second specimen temperature control disk are all hollow structures; the temperature control medium output pipe of the constant temperature liquid bath is respectively connected to the top of the first specimen temperature control disk, the first filling material temperature control disk, the second filling material temperature control disk and the second specimen temperature control disk, and the temperature control medium reflux pipe of the constant temperature liquid bath is respectively connected to the bottom of the first specimen temperature control disk, the first filling material temperature control disk, the second filling material temperature control disk and the second specimen temperature control disk.

[0019] The beneficial effects of adopting the above technical solution are as follows: during the actual construction process, a deswelling groove is set in the semi-rigid base to slow down the arching effect of the road surface. This technical solution sets a deswelling groove between two test pieces to simulate the deswelling groove setting structure in actual use. Considering that the deswelling groove and the semi-rigid base material are in the same environment during actual use, the first filling material temperature control disk and the second filling material temperature control disk can heat the filling material, and the two ends of the test piece are heated by the corresponding filling material temperature control disk and the test piece temperature control disk respectively. The first filling material temperature control disk, the second filling material temperature control disk and the test piece temperature control disk are all adjusted by a constant temperature liquid bath to achieve synchronous heating of the deswelling groove and the test piece, and also make the test piece and the deswelling groove heated more evenly.

[0020] Furthermore, a second vertical displacement measuring member for measuring the degree of deformation of the filling material is provided in the de-swelling groove.

[0021] Furthermore, the number of the second vertical displacement measuring pieces is 2, and the two second vertical displacement measuring pieces are respectively arranged on the inner sides of the first filling material temperature control disk and the second filling material temperature control disk.

[0022] A method for comparing and selecting a semi-rigid base deswelling groove filling material test system comprises the following steps:

[0023] S1: placing the first filling material in the deswelling tank, placing the specimens in the first specimen placement cavity and the second specimen placement cavity respectively, adjusting the temperatures of the first specimen temperature control plate, the first filling material temperature control plate, the second filling material temperature control plate and the second specimen temperature control plate by a constant temperature liquid bath and heating the specimens for a certain period of time;

[0024] S2: The horizontal displacement measuring piece and the first vertical displacement measuring piece measure the deformation degree of the specimen in the horizontal direction and the vertical direction respectively, and the pressure sensor measures the stress value generated by the specimen;

[0025] S3: Select multiple filling materials and repeat the above steps S1 and S2 to obtain the deformation degree and stress value of each filling material;

[0026] S4: Take the average value of the values ​​measured by the horizontal displacement measuring piece at the same temperature, compare the average values, and select the filling material whose horizontal displacement value is within the allowable range;

[0027] S5: taking an average value of the values ​​measured by the first vertical displacement measuring member at the same temperature, and comparing the average values, and selecting a filling material whose vertical displacement value is within the allowable range;

[0028] S6: Using the stress value measured by the pressure sensor at the same temperature as the ordinate and the time as the abscissa to draw the curve of the stress change of the filling material over time, and select the filling material whose stress value is within the allowable range;

[0029] S7: Select the filling material whose horizontal displacement value and vertical displacement value are both within the allowable range and whose stress value is the smallest at the same temperature as the optimal filling material.

[0030] The invention has the following beneficial effects:

[0031] (1) The test pieces on both sides of the deswelling trough of the present invention are used to simulate the semi-rigid base used in the actual construction process. Different filling materials are filled into the deswelling trough to simulate the quality test of different deswelling trough filling materials in the actual engineering application of the semi-rigid base. The heating temperature of the test piece can be adjusted by a constant temperature liquid bath. In addition, the technical solution is simple and easy to implement. Not only can the test be carried out indoors, but also the actual working conditions of high temperature and extreme dryness in the Gobi saline soil area can be simulated to test the deformation relief capacity of the deswelling trough filling material at different temperatures. By setting a horizontal displacement measuring piece, a first vertical displacement measuring piece and a pressure sensor, the capacity of the filling material to relieve arch expansion at a certain temperature is obtained, thereby providing support for how to select and test the deswelling trough filling material during the working process, and solving the problem that the current filling material research is carried out through actual construction of test sections, which has a large amount of engineering work and is easily affected by the environment.

[0032] (2) The present invention takes into account that during actual use, the deswelling trough and the semi-rigid base material are in the same environment, the first filling material temperature control disk and the second filling material temperature control disk can heat the filling material, and the two ends of the specimen are heated by the corresponding filling material temperature control disk and the specimen temperature control disk respectively. The first filling material temperature control disk, the second filling material temperature control disk and the specimen temperature control disk are all adjusted by a constant temperature liquid bath to achieve synchronous heating of the deswelling trough and the specimen, and also make the heating of the specimen and the deswelling trough more uniform.

[0033] (3) The distance adjustment component of the present invention can adjust the relative distance between the test piece and the heat preservation box, thereby meeting the test requirements of a semi-rigid base with a smaller lateral width. In addition, the connection between the structures is more compact, which is conducive to the horizontal displacement measuring component and the first vertical displacement measuring component to measure the expansion force of the test piece.

[0034] (4) In the present invention, soil pressure boxes are respectively arranged on the inner walls of the first filling material temperature control disk and the second filling material temperature control disk, so as to measure the pressure values ​​generated by the two test pieces on the de-swelling groove respectively, which are used as reference values ​​of the de-swelling groove's deformation relief capability, and the measured data are more comprehensive.

[0035] (5) The temperature sensor of the present invention is used to detect the temperature in the deswelling tank, correlate the deformation amount and expansion pressure with the temperature, and evaluate the ability of different filling materials to relieve the arch expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the semi-rigid base deswelling groove filling material testing system of the present invention.

[0037] Figure 2 It is a structural schematic diagram of the pressure detection component of the present invention.

[0038] Figure 3 It is a schematic structural diagram of a constant temperature liquid bath of the present invention.

[0039] In the figure: 1-insulation box; 21-first specimen temperature control plate; 22-first filling material temperature control plate; 23-second filling material temperature control plate; 24-second specimen temperature control plate; 25-constant temperature liquid bath; 201-first specimen placement cavity; 202-de-swelling tank; 203-second specimen placement cavity; 3-movable bottom plate; 401-horizontal displacement measuring piece; 402-first vertical displacement measuring piece; 403-second vertical displacement measuring piece; 5-pressure sensor; 7-distance adjustment component; 701-rotation adjustment rod; 702-locking piece; 703-connecting plate; 801-earth pressure box; 802-stress monitor; 9-temperature measurement component; 901-temperature sensor; 902-temperature monitor. DETAILED DESCRIPTION

[0040] The principles and features of the invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the invention and are not used to limit the scope of the invention.

[0041] The specimen of the present invention is a semi-rigid base. Considering that the areas where arching occurs are all located in sulfate-saline soil areas, the filling materials that need to be compared and the base materials of the study area are configured according to different sulfate dosages based on the salt content test results of the aggregate in the study area. The cross-sectional dimensions and length of the specimen after curing are measured and recorded, and the two end faces of the long axis are ground flat.

[0042] Please refer to Figure 1A semi-rigid base deswelling tank filling material testing system includes an insulation box 1 and a temperature control component, the temperature control component includes a constant temperature liquid bath 25 and a first specimen temperature control disk 21, a first filling material temperature control disk 22, a second filling material temperature control disk 23 and a second specimen temperature control disk 24 which are sequentially arranged in the insulation box 1 and connected to the constant temperature liquid bath 25. A first specimen placement cavity 201 and a second specimen placement cavity 203 are formed between the first specimen temperature control disk 21 and the first filling material temperature control disk 22, and between the second specimen temperature control disk 24 and the second filling material temperature control disk 23; a deswelling tank 202 is formed between the first filling material temperature control disk 22 and the second filling material temperature control disk 23; a horizontal displacement measuring piece 401 and a first vertical displacement measuring piece 402 for detecting the deformation degree of the specimen are respectively arranged in the first specimen placement cavity 201 and the second specimen placement cavity 203; pressure sensors 5 are respectively arranged on the outer sides of the first specimen temperature control disk 21 and the second specimen temperature control disk 24. In the present embodiment, the outer side of the first specimen temperature control disk 21 and the second specimen temperature control disk 24 refers to the side where the first specimen temperature control disk 21 and the second specimen temperature control disk 24 are away from each other, the specimens are placed in the first specimen placement cavity 201 and the second specimen placement cavity 203 respectively, the first filling material is filled into the deswelling groove 202, the temperature of the constant temperature liquid bath 25 is set, the specimen expands due to heat, the working state of the deswelling groove 202 is observed, and the deformation value and pressure value are measured. At this time, after the data test of the first filling material is completed, the second filling material and the sample are replaced, the set temperature is consistent with the value of the first group of filling materials, the above steps are repeated to measure the deformation value and pressure value of the second filling material, and the obtained values ​​are compared to obtain the optimal deswelling groove 202 filling material, and the subsequent filling materials all repeat the above steps. The test pieces on both sides of the deswelling trough 202 of the present invention are used to simulate the semi-rigid base used in the actual construction process. Different filling materials are filled into the deswelling trough 202 to simulate the quality test of different deswelling trough 202 filling materials in the actual engineering application of the semi-rigid base. The heating temperature of the test piece can be adjusted by the constant temperature liquid bath 25. The present invention is simple and easy to implement. Not only can it be tested indoors, but it can also simulate the actual working conditions of high temperature and extreme dryness in the Gobi saline soil area to test the deformation relief ability of the deswelling trough 202 filling material at different temperatures. By setting the horizontal displacement measuring piece 401, the first vertical displacement measuring piece 402 and the pressure sensor 5, the ability of the filling material to relieve arch expansion at a certain temperature is obtained, thereby providing support for how to select and test the deswelling trough 202 filling material during the working process, and solving the problem that the current filling material research is tested through the actual construction of the test section, the engineering amount is large, and it is easily affected by the environment.

[0043] The thermal insulation box 1 is made of transparent insulation material, and the transparent insulation material is organic glass. A sealing cover is provided on the top of the thermal insulation box 1. When the first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24 need to be installed, the sealing cover is opened and the sealing cover is covered before the test starts.

[0044] Please refer to Figure 2 , the inner sides of the first filling material temperature control disk 22 and the second filling material temperature control disk 23 are respectively provided with earth pressure boxes 801 for measuring the pressure of the filling materials, and the earth pressure boxes 801 are respectively electrically connected to the stress monitors 802 arranged outside the heat preservation box 1, and the pressure sensors 5 are also respectively electrically connected to the stress monitors 802. The model of the stress monitor 802 is PROTO-IXRD-MGR, and the model of the earth pressure box 801 is YT-ZX-0300. The earth pressure boxes 801 are respectively arranged on both sides of the middle of the filling material. In this embodiment, the earth pressure boxes 801 can be arranged on the corresponding filling material temperature control disk, and matching filling materials are prepared to ensure that the earth pressure boxes 801 are in contact with the filling materials. They can also be placed between the filling materials and the corresponding temperature control disks during the placement of the filling materials. Since the specimen expands at both ends, the deswelling groove 202 between the two specimens will be subjected to a certain pressure. Earth pressure boxes 801 are respectively provided on the inner walls of the first filling material temperature control disk 22 and the second filling material temperature control disk 23. The pressure values ​​generated by the two specimens on the deswelling groove 202 can be measured as a reference value for the deformation relief capability of the deswelling groove 202, so that the measured data are more comprehensive.

[0045] The de-swelling tank 202 is also provided with a temperature sensor 901 for detecting the temperature in the tank, and the temperature sensor 901 is electrically connected to a temperature monitor 902 provided outside the incubator 1. The model of the temperature monitor 902 is EWQ-001, and the temperature sensor 901 is used to detect the temperature in the de-swelling tank 202, correspond the deformation amount and the expansion pressure to the temperature, and evaluate the ability of different filling materials to relieve the arching.

[0046] The de-swelling groove 202 is provided with a second vertical displacement measuring piece 403 for measuring the deformation degree of the filling material. In the present embodiment, the horizontal displacement measuring piece 401, the first vertical displacement measuring piece 402 and the second vertical displacement measuring piece 403 are all micrometers. When preparing the test piece, two steel sheets are pre-buried in the middle of the test piece, the horizontal displacement measuring piece 401 is vertically arranged and connected to the steel sheet, and the first vertical displacement measuring piece 402 is horizontally arranged and vertically connected to the steel sheet; after the filling material is filled in the de-swelling groove 202, two steel sheets are pre-buried in the filling material, and the second vertical displacement measuring piece 403 is horizontally arranged and vertically connected to the steel sheet. In the actual construction process, the de-swelling groove 202 is set in the semi-rigid base to slow down the arching effect of the road surface. The present invention sets the de-swelling groove 202 between the two test pieces to simulate the de-swelling groove 202 setting structure actually used. The specimens are placed in the first specimen placement cavity 201 and the second specimen placement cavity 203 respectively, and the horizontal displacement measuring piece 401 and the first vertical displacement measuring piece 402 are arranged on the top of the specimen. The first group of filling materials is filled into the deswelling groove 202, and the temperature of the constant temperature liquid bath 25 is set. The corresponding temperature control plate and the placement groove are heated to make the specimen expand due to heat, and the working state of the deswelling groove 202 is observed. At this time, the first thing to consider is the deformation value of the specimen in the horizontal and vertical directions, that is, the deformation value measured by the horizontal displacement measuring piece 401 and the first vertical displacement measuring piece 402, which indicates that the deswelling groove 202 allows the deformation of the water-stable base within its effective range; secondly, the pressure generated in the horizontal direction of the specimen is observed, that is, the pressure value measured by the pressure sensor 5, which indicates the expansion force generated inside the specimen under the action of temperature and salt.

[0047] The first specimen placement cavity 201 is set on the left side of the deswelling groove 202, and the second specimen placement cavity 203 is set on the right side of the deswelling groove 202 (based on the orientation shown in the figure). The first specimen placement cavity 201 and the second specimen placement cavity 203 are respectively provided with a movable bottom plate 3 for supporting the specimen, and a plurality of pulleys are respectively provided at the bottom of the movable bottom plate 3. Since the specimen will expand to a certain extent when heated and the volume becomes larger, the specimen is set on the movable bottom plate 3. As the temperature rises, the specimen expands and the movable bottom plate 3 moves in the corresponding placement cavity, reducing the friction between the specimen and the bottom of the incubator 1, and obtaining more accurate deformation and pressure values.

[0048] Please refer to Figures 1 to 3The first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24 are all hollow structures. A certain distance is left between the top of the first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24 and the insulation box 1 to prevent interference with the micrometer reading. The constant temperature liquid bath 25 is a high and low temperature constant temperature liquid bath 25, and the model of the constant temperature liquid bath 25 is CH3030. The constant temperature liquid bath 25 is provided with a temperature control medium output pipe and a temperature control medium output pipe. The temperature control medium output pipe is provided with multiple branches, and the branches are respectively connected to the top of the first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24. The temperature control medium output pipe is provided with multiple branches, and the branches are respectively connected to the temperature control medium reflux pipe of the constant temperature liquid bath 25 and the bottom of the first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24. Taking into account that during actual use, the deswelling trough 202 and the semi-rigid base material are in the same environment, the first filling material temperature control disk 22 and the second filling material temperature control disk 23 can heat the filling material, and the two ends of the specimen are heated by the corresponding filling material temperature control disk and the specimen temperature control disk respectively, and the first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24 are all adjusted by the constant temperature liquid bath 25 to achieve synchronous heating of the deswelling trough 202 and the specimen, and also make the heating of the specimen and the deswelling trough 202 more uniform.

[0049] The first specimen temperature control disk 21, the first filling material temperature control disk 22, the second filling material temperature control disk 23 and the second specimen temperature control disk 24 are relatively movable and arranged in the heat preservation box 1, and the model of the pressure sensor 5 is GP2Y0A02YK0F. In this embodiment, a distance adjustment component 7 is arranged on the outside of the second specimen temperature control disk 24, and in other embodiments, the distance adjustment component 7 can be arranged on the outside of the first specimen temperature control disk 21. The distance adjustment component 7 includes a rotating adjustment rod 701, a locking member 702 and a connecting plate 703 connected to the corresponding pressure sensor 5, the rotating adjustment rod 701 is threadedly connected to the heat preservation box 1, the rotating adjustment rod 701 is a bolt, the locking member 702 is a nut, the connecting end of the rotating adjustment rod 701 extends into the heat preservation box 1 and is connected to the connecting plate 703, and the adjusting end of the rotating adjustment rod 701 extends out of the heat preservation box 1 and is sleeved with a locking member 702. The test pieces are placed in the first test piece placement cavity 201 and the second test piece placement cavity 203 respectively, and the knob rotates the adjustment rod 701, so that the connecting plate 703 abuts against the corresponding pressure sensor 5, and pushes the test piece and the filling material to move to the left. When the data measured by the pressure sensor 5 returns to zero, the knob locking member 702 abuts against the incubator 1, and the distance between the ends of the two test pieces is fixed. The distance adjustment component 7 of the present invention can adjust the relative distance between the test piece and the incubator 1, thereby meeting the test requirements of the semi-rigid base with a smaller lateral width, and the connection between the structures is more compact, which is conducive to the horizontal displacement measuring member 401 and the first vertical displacement measuring member 402 to measure the expansion force of the test piece.

[0050] A method for comparing and selecting a semi-rigid base deswelling groove filling material test system, the method comprising the following steps:

[0051] S1: placing the first filling material in the deswelling tank 202, placing the specimens in the first specimen placement cavity 201 and the second specimen placement cavity 203 respectively, adjusting the temperatures of the first specimen temperature control plate 21, the first filling material temperature control plate 22, the second filling material temperature control plate 23 and the second specimen temperature control plate 24 by the constant temperature liquid bath 25 and heating the specimens for a certain period of time;

[0052] S2: The horizontal displacement measuring member 401 and the first vertical displacement measuring member 402 measure the deformation degree of the specimen in the horizontal direction and the vertical direction respectively, and the pressure sensor 5 measures the stress value generated by the specimen;

[0053] S3: Select multiple filling materials and repeat the above steps S1 and S2 to obtain the deformation degree and stress value of each filling material;

[0054] S4: taking an average value of the values ​​measured by the horizontal displacement measuring member 401 at the same temperature, and comparing the average values, and selecting a filling material whose horizontal displacement value is within the allowable range;

[0055] S5: taking an average value of the values ​​measured by the first vertical displacement measuring member 402 at the same temperature, and comparing the average values, and selecting a filling material whose vertical displacement value is within the allowable range;

[0056] S6: Using the stress value measured by the pressure sensor 5 at the same temperature as the ordinate and the time as the abscissa, respectively draw the curve of the stress change of the filling material over time, and select the filling material whose stress value is within the allowable range;

[0057] S7: Select the filling material whose horizontal displacement value and vertical displacement value are both within the allowable range and whose stress value is the smallest at the same temperature as the optimal filling material.

[0058] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. A semi-rigid base deswelling groove filling material testing system, characterized in that: include: Insulation box (1) and temperature control assembly; The temperature control component comprises a constant temperature liquid bath (25), and a first specimen temperature control disk (21), a first filling material temperature control disk (22), a second filling material temperature control disk (23), and a second specimen temperature control disk (24) which are sequentially arranged in the heat preservation box (1) and respectively connected to the constant temperature liquid bath (25); A first specimen placement cavity (201) and a second specimen placement cavity (203) are respectively formed between the first specimen temperature control disk (21) and the first filling material temperature control disk (22), and between the second specimen temperature control disk (24) and the second filling material temperature control disk (23); a deswelling groove (202) is formed between the first filling material temperature control disk (22) and the second filling material temperature control disk (23); A horizontal displacement measuring piece (401) and a first vertical displacement measuring piece (402) for detecting the deformation degree of the test piece are respectively arranged in the first test piece placement cavity (201) and the second test piece placement cavity (203); pressure sensors (5) are respectively arranged on the outer sides of the first test piece temperature control disk (21) and the second test piece temperature control disk (24); The comparison method of the semi-rigid base deswelling groove filling material test system comprises the following steps: S1: placing a first filling material in the deswelling tank (202), placing the test pieces in the first test piece placement cavity (201) and the second test piece placement cavity (203), respectively, adjusting the temperatures of the first test piece temperature control disk (21), the first filling material temperature control disk (22), the second filling material temperature control disk (23) and the second test piece temperature control disk (24) by the constant temperature liquid bath (25), and heating the test pieces for a certain period of time; S2: the horizontal displacement measuring member (401) and the first vertical displacement measuring member (402) respectively measure the deformation degree of the specimen in the horizontal direction and the vertical direction, and the pressure sensor (5) measures the stress value generated by the specimen; S3: Select multiple filling materials and repeat the above steps S1 and S2 to obtain the deformation degree and stress value of each filling material; S4: taking an average value of the values ​​measured by the horizontal displacement measuring member (401) at the same temperature, comparing the average values, and selecting a filling material whose horizontal displacement value is within an allowable range; S5: taking an average value of the values ​​measured by the first vertical displacement measuring member (402) at the same temperature, comparing the average values, and selecting a filling material whose vertical displacement value is within an allowable range; S6: Using the stress value measured by the pressure sensor (5) at the same temperature as the ordinate and the time as the abscissa, respectively draw a curve of the stress change of the filling material over time, and select the filling material whose stress value is within the allowable range; S7: Select the filling material whose horizontal displacement value and vertical displacement value are both within the allowable range and whose stress value is the smallest at the same temperature as the optimal filling material.

2. The semi-rigid base deswelling groove filling material testing system according to claim 1, characterized in that: A distance adjustment component (7) is arranged on the outer side of the second specimen temperature control disk (24), the distance adjustment component (7) is arranged horizontally and is threadedly connected to the thermal insulation box (1), the distance adjustment component (7) comprises a connecting end and an adjusting end, the connecting end extends into the thermal insulation box (1) and is connected to the pressure sensor (5) of the second specimen temperature control disk (24), and the adjusting end extends out of the thermal insulation box (1).

3. The semi-rigid base deswelling groove filling material testing system according to claim 2, characterized in that: The distance adjustment assembly (7) comprises a rotary adjustment rod (701), a locking piece (702) and a connecting plate (703) connected to the pressure sensor (5); the rotary adjustment rod (701) is threadedly connected to the heat preservation box (1); one end of the rotary adjustment rod (701) extends into the heat preservation box (1) and is connected to the connecting plate (703); the other end of the rotary adjustment rod (701) extends out of the heat preservation box (1) and is sleeved with the locking piece (702).

4. The semi-rigid base deswelling groove filling material testing system according to claim 1, characterized in that: The first filling material temperature control disk (22) and the second filling material temperature control disk (23) are respectively provided with earth pressure boxes (801) for measuring the pressure of the filling materials. The earth pressure boxes (801) are respectively electrically connected to stress monitors (802) arranged outside the insulation box (1), and the pressure sensors (5) are also respectively electrically connected to the stress monitors (802).

5. The semi-rigid base deswelling groove filling material testing system according to claim 1, characterized in that: The deswelling tank (202) is provided with a temperature sensor (901) for detecting the temperature in the tank, and the temperature sensor (901) is electrically connected to a temperature monitor (902) provided outside the heat preservation box (1).

6. The semi-rigid base deswelling groove filling material testing system according to claim 1, characterized in that: A movable bottom plate (3) for supporting the specimen is respectively arranged in the first specimen placement cavity (201) and the second specimen placement cavity (203), and a plurality of pulleys are respectively arranged at the bottom of the movable bottom plate (3).

7. The semi-rigid base deswelling groove filling material testing system according to claim 1, characterized in that: The first specimen temperature control disk (21), the first filling material temperature control disk (22), the second filling material temperature control disk (23) and the second specimen temperature control disk (24) are all hollow structures; the temperature control medium output pipe of the constant temperature liquid bath (25) is respectively connected to the top of the first specimen temperature control disk (21), the first filling material temperature control disk (22), the second filling material temperature control disk (23) and the second specimen temperature control disk (24); the temperature control medium return pipe of the constant temperature liquid bath (25) is respectively connected to the bottom of the first specimen temperature control disk (21), the first filling material temperature control disk (22), the second filling material temperature control disk (23) and the second specimen temperature control disk (24).

8. The semi-rigid base deswelling groove filling material testing system according to any one of claims 1 to 7, characterized in that: The de-swelling groove (202) is provided with a second vertical displacement measuring member (403) for measuring the degree of deformation of the filling material.

9. The semi-rigid base deswelling groove filling material testing system according to claim 8, characterized in that: The number of the second vertical displacement measuring pieces (403) is 2, and the two second vertical displacement measuring pieces (403) are respectively arranged on the inner side of the first filling material temperature control disk (22) and the second filling material temperature control disk (23).

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