Asphalt concrete triaxial creepmeter

Abstract

The invention discloses an asphalt concrete triaxial creepmeter which comprises a pressure chamber, a dial indicator is installed on the pressure chamber, an axial loading lever, an oil pressure balance system, a confining pressure system and a volume measurement system are arranged on the pressure chamber, the axial loading lever comprises a steel base, a loading lever is installed on the steel base, and the loading lever is connected with the oil pressure balance system. Two ends of the loading lever are respectively provided with an axial force applying weight and an adjusting weight, the oil pressure balance system comprises an oil pressure pump and a pressure gauge, and the confining pressure system comprises a water pump. According to the bituminous concrete triaxial creepmeter, an axial loading lever is adopted by the loading system, test interruption caused by the electric power problem in the test process is avoided, confining pressure is applied through water instead of being originally applied by high-pressure nitrogen through a pressure reducing valve, so that the confining pressure can be stabilized more quickly, the test cost is saved, and the test efficiency is improved through a measuring cylinder and a dial indicator. The drainage weight is measured, volume change is converted, and the measurement precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic asphalt concrete testing, in particular to an asphalt concrete triaxial creep instrument. Background Art

[0002] Creep is a reflection of the performance of materials under long-term load and dimensional stability. Asphalt concrete, as a typical viscoelastic material, has very obvious creep characteristics. Asphalt concrete is widely used in water conservancy projects due to its advantages such as good anti-seepage performance, strong deformation adaptability, good anti-aging performance, certain crack self-healing ability and corrosion resistance, such as dam body (earth-rock dam, masonry dam, etc.) anti-seepage, channel anti-seepage, underground engineering anti-seepage, pumped storage power station regulating reservoir and water supply pool anti-seepage, permeable dam water filtration structure, earth-rock dam slope protection, river embankment (bank), seaport breakwater and other waterproof and water-stopping materials. Hydraulic asphalt concrete anti-seepage engineering, especially the asphalt core wall of earth-rock dam buried in the dam body, is in a triaxial stress state for a long time, which directly affects the force form and internal stress of the asphalt concrete core wall, and will also produce large creep. Therefore, the study of the triaxial creep characteristics of asphalt concrete is of great significance for its normal anti-seepage function.

[0003] At present, the commonly used asphalt concrete creep test equipment is mainly based on geotechnical test methods. The geotechnical creep test cycle is relatively short, and the loading is mostly controlled by air pressure or servo motor. The volume change is measured by drainage method. Compared with geotechnical tests, the triaxial creep test of hydraulic asphalt concrete has a longer cycle, even up to 3 to 6 months. Power outages are not allowed during the creep test. The confining pressure uses air pressure for a long time, which is costly and unstable. The volume change is very small. The overflow method measures the volume change due to the accuracy of the measuring cylinder, which affects the volume change results.

[0004] For example, patent publication number CN201464298U is specifically a triaxial creep tester for unsaturated soil, which involves geotechnical testing instruments. A clay plate with a high air intake value is embedded in the base of the pressure chamber, so that water in the soil sample can pass through while the applied gas cannot pass through, thereby achieving the purpose of controlling matrix suction and draining water. The upper part of the clay plate is a sample with a rubber membrane, and the upper part of the sample is a permeable plate and a sample cap. The sample cap is connected to a set of pipes that can control air pressure, so as to apply and control pore air pressure to the sample. The bottom of the clay plate is connected to a flushing pipe and a drainage pipe, respectively, to flush the bubbles at the bottom of the clay plate and drain water. The sample pressure chamber adopts a double-layer pressure chamber, which is a double-layer organic glass cylinder. The inner pressure chamber is filled with airless water to apply confining pressure to the sample. The outer pressure chamber applies air pressure of the same confining pressure value to eliminate the influence of the deformation of the inner pressure chamber on the volume change value, which has the above-mentioned problem.

[0005] For example, patent publication number CN206787927U is specifically a triaxial creep tester for urban domestic garbage soil, which includes a garbage soil sample pressurization system, a steam generation system and a temperature display system. The garbage soil sample pressurization system includes a force adder and a pressure chamber. A rubber membrane filled with garbage soil samples is provided in the pressure chamber. The top and bottom ends of the rubber membrane are respectively fixed on the sample cap and the base, and the top of the sample cap is connected to the force adder; the rubber membrane is divided into a sample chamber and a temperature monitoring chamber from top to bottom, the sample chamber is filled with a first part of garbage soil samples, the temperature monitoring chamber is filled with a second part of garbage soil samples, and a first temperature sensor is provided inside the second part of the garbage soil sample; a steam space is formed between the rubber membrane and the inner wall of the pressure chamber, and a second temperature sensor is provided in the steam space. The utility model can truly reflect the high heterogeneity, large void ratio and high compressibility of garbage soil, use steam as a medium to apply confining pressure to the sample, and can simulate the influence of different temperatures on the creep of garbage soil. However, the above-mentioned problems exist. Summary of the invention

[0006] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an asphalt concrete triaxial creep tester to solve the above problems.

[0007] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: an asphalt concrete triaxial creep instrument, comprising a pressure chamber, a micrometer is installed on the pressure chamber, an axial loading lever, an oil pressure balance system, a confining pressure system and a volume measurement system are provided on the pressure chamber; The axial loading lever comprises a steel base, on which a loading lever is mounted, and at both ends of the loading lever, an axial force weight and an adjustment weight are mounted respectively; The oil pressure balance system includes an oil pressure pump and a pressure gauge; The confining pressure system includes a water pump, the end of the water pump is connected to a water tank, a piston is installed on one side of the water tank, a confining pressure lever is rotatably installed on the end of the piston, a confining pressure control weight and a balancing weight are connected to the confining pressure lever, and a water pressure gauge is installed on the water tank; The volume measurement system consists of a measuring cylinder and a valve.

[0008] The oil pressure pump is connected to the pressure chamber, and the pressure chamber is connected to the loading lever, so that the oil pressure pump can lift the pressure chamber, and the pressure chamber can drive the loading lever to rotate and balance.

[0009] The oil pressure pump and the pressure gauge are respectively arranged on both sides of the bottom of the pressure chamber, and both the oil pressure pump and the pressure gauge are connected to the bottom of the pressure chamber, so that the pressure gauge can be used to detect the oil pressure of the oil pressure pump.

[0010] One end of the water pump is connected to the water tank, and the other end of the water pump is connected to the water source, so that the water pump can pass water into the water tank and then pass the water into the pressure chamber.

[0011] The water tank is connected to the inner cavity of the pressure chamber through a connecting pipe, so that the water in the water tank can enter the interior of the pressure chamber.

[0012] The water tank is connected with the measuring cylinder, so that the communication between the measuring cylinder and the water tank can be controlled by a valve.

[0013] The pressure gauge is set as a digital oil pressure gauge.

[0014] One end of the loading lever close to the adjustment weight is rotatably connected to a support frame, and the connection position between the loading lever and the pressure chamber is close to the support frame.

[0015] The water pressure gauge is set to a digital display water pressure gauge.

[0016] A vertical frame is fixedly connected to the top of the water tank, and two fixed pulleys are installed on the vertical frame.

[0017] One end of the confining pressure control weight is fixedly connected with a first connecting rope, and the other end of the first connecting rope is connected to the top end of the confining pressure lever.

[0018] One end of the balancing weight is fixedly connected with a second connecting rope, and the end of the second connecting rope is connected to the confining pressure lever.

[0019] The first connecting rope and the second connecting rope are respectively arranged on the two fixed pulleys.

[0020] The valve is installed between the water tank and the measuring cylinder.

[0021] The bottom end of the confining pressure lever is movably connected to the water tank through a connecting rod.

[0022] (III) Beneficial effects The present invention provides an asphalt concrete triaxial creep tester. Compared with the prior art, it has the following beneficial effects: (1) The asphalt concrete triaxial creep tester adopts an axial loading lever through the loading system to avoid test interruption due to power problems during the test.

[0023] (2) The asphalt concrete triaxial creep tester applies confining pressure through water instead of high-pressure nitrogen gas through a pressure reducing valve. This can stabilize the confining pressure faster and save test costs.

[0024] (3) The asphalt concrete triaxial creep instrument measures the weight of drainage through a measuring cylinder and a micrometer, converts it into volume change, and improves the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a creep curve diagram of A-1 of the present invention under a confining pressure of 0.5 MPa.

[0027] Figure 3 This is a single logarithmic curve graph of the A-1 graded loading of the present invention.

[0028] Figure 4 It is a creep curve diagram of the test piece A-2 of the present invention under a confining pressure of 1.0 MPa.

[0029] Figure 5 It is a single logarithmic curve diagram of the graded loading of the specimen A-2 of the present invention.

[0030] Figure 6 This is the creep curve of the specimen A-3 of the present invention under a confining pressure of 1.5 MPa.

[0031] Figure 7 It is a single logarithmic curve of graded loading of the specimen A-3 of the present invention.

[0032] Figure 8 This is the time-strain curve of the test piece B-1 of the present invention under the axial pressure of 1.44 MPa under the step-by-step unloading confining pressure.

[0033] Fig. 9 It is a single logarithmic time-strain curve diagram of the specimen B-1 of the present invention under various levels of confining pressure.

[0034] Fig.10 This is a time-strain curve diagram of the stepwise unloading confining pressure of the specimen B-2 of the present invention under an axial pressure of 1.0 MPa.

[0035] Fig.11 It is a single logarithmic time-strain curve diagram of the specimen B-2 of the present invention under various levels of confining pressure.

[0036] Fig.12 This is a creep curve diagram of C-1 of the present invention at a stress ratio of 1.2.

[0037] Fig.13 This is a single logarithmic curve diagram of graded loading of C-1 of the present invention at a stress ratio of 1.2.

[0038] Fig.14 This is a creep curve diagram of C-2 of the present invention at a stress ratio of 1.5.

[0039] Fig.15 It is a single logarithmic curve diagram of graded loading of C-2 of the present invention at a stress ratio of 1.5.

[0040] In the figure: 1. Pressure chamber; 2. Micrometer; 3. Confining pressure control weight; 4. Hydraulic pump; 5. Axial force weight; 6. Pressure gauge; 7. Measuring cylinder; 8. Water pump; 9. Water tank; 10. Water pressure gauge; 11. Loading lever; 12. Adjustment weight; 13. Confining pressure lever; 14. Balance weight; 15. Piston. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1 The embodiment of the present invention provides a technical solution: an asphalt concrete triaxial creep tester, including a pressure chamber 1, the pressure chamber 1 has good air tightness to ensure the continuous progress of the test, the pressure chamber 1 is equipped with a micrometer 2, the micrometer 2 can detect the movement of the pressure chamber 1, the pressure chamber 1 is provided with an axial loading lever, an oil pressure balance system, a confining pressure system and a volume measurement system, and is equipped with a large-scale temperature control device for controlling the ambient temperature, the controllable temperature is -50℃~+50℃, and the temperature control accuracy does not exceed ±1℃, so as to effectively control the main factors affecting the performance of asphalt concrete.

[0043] The axial loading lever includes a steel base, on which a loading lever 11 is installed. An axial force weight 5 and an adjustment weight 12 are installed at both ends of the loading lever 11 respectively. One end of the loading lever 11 close to the adjustment weight 12 is rotatably connected to a support frame. The connection position between the loading lever 11 and the pressure chamber 1 is close to the support frame. The axial force weight 5 can be used to drive the loading lever 11 to sag, and the adjustment weight 12 can be used to correct the balance of the loading lever 11.

[0044] The oil pressure balancing system includes an oil pressure pump 4 and a pressure gauge 6. The pressure gauge 6 is set as a digital oil pressure gauge, which can be easily read. The oil pressure pump 4 is connected to the pressure chamber 1, and the pressure chamber 1 is connected to the loading lever 11, so that the oil pressure pump 4 can lift the pressure chamber 1, so that the pressure chamber 1 can drive the loading lever 11 to rotate and balance. The oil pressure pump 4 and the pressure gauge 6 are respectively arranged on both sides of the bottom of the pressure chamber 1, and the oil pressure pump 4 and the pressure gauge 6 are both connected to the bottom of the pressure chamber 1, so that the pressure gauge 6 can be used to detect the oil pressure of the oil pressure pump 4. When the tilt angle is too large, it will affect the test data. At this time, the oil pressure pump 4 is used to lift the entire pressure chamber 1 until the loading lever 11 is horizontal.

[0045] The confining pressure system includes a water pump 8, which is a manual pressure pump, which is convenient for the staff to operate. The end of the water pump 8 is connected to a water tank 9, and the top of the water tank 9 is fixedly connected to a stand. One end of the confining pressure control weight 3 is fixedly connected to a first connecting rope, and the other end of the first connecting rope is connected to the top of the confining pressure lever 13. One end of the balancing weight 14 is fixedly connected to a second connecting rope, and the end of the second connecting rope is connected to the confining pressure lever 13. The first connecting rope and the second connecting rope are respectively arranged on two fixed pulleys, and two fixed pulleys are installed on the stand. A piston 15 is installed on one side of the water tank 9. The piston A confining pressure lever 13 is rotatably installed at the end of 15, and the bottom end of the confining pressure lever 13 is movably connected to the water tank 9 through a connecting rod. The confining pressure lever 13 is connected to a confining pressure control weight 3 and a balancing weight 14. A water pressure gauge 10 is installed on the water tank 9. The water pressure gauge 10 is set as a digital display water pressure gauge, which can be easily read. The water tank 9 is connected to the inner cavity of the pressure chamber 1 through a connecting pipe, so that the water in the water tank 9 can enter the pressure chamber 1 and drive the confining pressure lever 13 to rotate through the confining pressure control weight 3. The rotation of the confining pressure lever 13 drives the piston 15 to move to load the confining pressure.

[0046] The volume measurement system includes a measuring cylinder 7 and a valve. The water tank 9 is connected to the measuring cylinder 7, and the valve is installed between the water tank 9 and the measuring cylinder 7, so that the connection between the measuring cylinder 7 and the water tank 9 can be controlled by the valve, and the valve can be used to manually control the water discharge to achieve the purpose of controlling the confining pressure. The confining pressure control accuracy is high.

[0047] Example 1 See also Figure 1-7 , use this device to carry out creep test under constant confining pressure and graded loading axial pressure: (1) Adjust the temperature in the thermostatic room to keep it at 11.4°C, with a deviation of no more than 1°C. (2) Put the test piece on the rubber film specially used for triaxial test, and then install it into the pressure chamber 1. Seal the periphery with grease, close the pressure chamber 1, and use the water pump 8 to inject the pre-prepared water into the pressure chamber 1, and prepare to start the test; (3) First, apply the preset confining pressure control weight 3 to the instrument, use the water pump 8 to inject water pressure to make it reach the preset confining pressure, stabilize the pressure for half an hour, then apply the preset axial force weight 5, use the micrometer 2, record the axial and volume readings at regular intervals, and manually control the water output to collect the volume change of the system during the test. Since the deformation of asphalt concrete has the characteristics of fast development in the early stage and slow development in the later stage, when recording the deformation, the interval time in the early stage of loading is shorter and the interval time in the later stage is longer. On the first day, read the time at 1 min, 2 min, 4 min, 6 min, 8 min, 10 min, 15 min, 20 min, 30 min, 1 h, 3 h, 4 h, 6 h, 7 h, 8 h, 9 h, 10 h, and 24 h, and read 1 to 2 times a day thereafter; (4) Plot the axial strain The relationship curve with time t, when the specimen deformation tends to be stable, or when the axial strain On the single logarithmic coordinate curve of time t, There is no longer a growth trend, so the next level of axial stress can be loaded. After each deformation tends to be stable, step 4 can be repeated until the corresponding stable modulus parameters are obtained.

[0048] Draw the relationship curve between axial strain ε and time t, and the experimental result is curve.

[0049] It can be seen from the actual creep curve that the axial strain will increase instantaneously when each level of axial stress is loaded, and each level takes a long time to reach a stable state. The instantaneous axial strain increases in proportion to the stress level. The confining pressure has a great influence on the axial deformation. Comparing the creep curves of three different confining pressures, under the total deviatoric stress of 0.65MPa, the axial strain of the creep test with a confining pressure of 0.5MPa is 6%, the axial strain of the creep test with a confining pressure of 1.0MPa is 5.2%, and the axial strain of the creep test with a confining pressure of 1.5MPa is 5%. This shows that when the same deviatoric stress is loaded, the greater the confining pressure, the smaller the corresponding axial deformation; When the same deviatoric stress is loaded in stages under the same confining pressure, the graded strains of the asphalt concrete core samples are roughly the same, so the corresponding stability modulus can be obtained.

[0050] Example 2 See also Figure 8-11 , use this device to carry out creep test under constant axial pressure and graded unloading confining pressure: (1) Adjust the temperature in the thermostatic room to keep it at 11.4°C, with a deviation of no more than 1°C.

[0051] (2) Put the test piece on a rubber film specially used for triaxial testing, then install it into the pressure chamber 1, seal the periphery with grease, close the pressure chamber 1, and use the water pump 8 to inject the pre-prepared water into the pressure chamber 1, and prepare to start the test.

[0052] (3) The specific method is to use the water pump 8 to inject water pressure to reach a certain confining pressure, stabilize the pressure for half an hour, then apply the preset axial pressure, install the micrometer 2, and record the axial and volume readings at regular intervals.

[0053] (4) Maintain the set axial stress Constant, add a certain amount of water each time, when the deformation of the specimen tends to be stable, or when the axial strain On the single logarithmic coordinate curve of time t, There is no longer a trend of growth, so the preset confining pressure can be unloaded. The specific steps are to release the corresponding amount of water from the confining pressure measurement system to achieve the purpose of controlling the confining pressure. After each deformation tends to be stable, the step can be repeated until the deformation reaches a certain value, then the test can be stopped and the axial strain can be drawn. The relationship curve with time t.

[0054] When the axial stress is constant at 1.44 MPa, each time the confining pressure is unloaded, it is equivalent to superimposing a stress on the original axial stress, thus causing the axial strain to increase instantaneously. This is similar to the stress-strain curve of axial stress loaded in stages under constant confining pressure. As the confining pressure decreases, the axial strain gradually increases (compression).

[0055] Example 3 See also Figure 12-15 , use this device to carry out creep test with fixed stress ratio and simultaneous loading of axial pressure and confining pressure: (1) Adjust the temperature in the thermostatic room to keep it at 11.4°C, with a deviation of no more than 1°C.

[0056] (2) Put the test piece on a rubber film specially used for triaxial testing, then install it into the pressure chamber 1, seal the periphery with grease, close the pressure chamber 1, and use the water pump 8 to inject the pre-prepared water into the pressure chamber 1, and prepare to start the test.

[0057] (3) Different from other embodiments, the loaded confining pressure and the loaded axial pressure are in a certain ratio, that is, a fixed stress ratio. First, a certain amount of water is injected, and then the confining pressure is gradually applied to increase the confining pressure in the instrument to a corresponding value. Then, the axial pressure is applied and controlled by the hydraulic pump 4 to achieve the purpose of lever balance. The specific method is to use the water pump 8 to inject water pressure to reach a certain confining pressure, stabilize the pressure for half an hour, and then apply the preset axial pressure. Install the micrometer 2, and record the axial and volume readings at regular intervals. In the test, the water output is manually controlled to collect the volume change of the system. Since the deformation of asphalt concrete has the characteristics of fast development in the early stage and slow development in the later stage, when recording the deformation, the interval time in the early stage of loading is shorter, and the interval time in the later stage is longer. The readings are more frequent on the first day, and 1 to 2 readings are taken every day thereafter.

[0058] (4) Plot the axial strain The relationship curve with time t, when the specimen deformation tends to be stable, or when the axial strain On the single logarithmic coordinate curve of time t, There is no longer a growth trend, so the preset confining pressure can be unloaded. The specific steps are to release the corresponding amount of water from the volume measurement system to achieve the purpose of controlling the confining pressure. After each deformation tends to be stable, the step can be repeated until the corresponding modulus parameters are obtained.

[0059] It can be seen from the stress-strain curve that the axial strain will increase instantaneously every time a fixed stress ratio is loaded, and the total strain of single-stage loading increases proportionally. Compared with the actual creep curves of the axial pressure test with constant confining pressure and the confining pressure test with constant confining pressure and graded unloading, the actual creep curve of fixed stress can be seen from the single logarithmic time-strain curve of graded loading. The curve intervals are uniform. As the axial pressure and confining pressure increase at the same time, the axial strain increases proportionally. When the same confining pressure is loaded, the axial strain with a large stress ratio is significantly greater than the axial strain with a small stress ratio, and there is no obvious difference.

[0060] The following conclusions are drawn from the above examples: (1) Different temperatures and different mix ratios have a great influence on the performance of asphalt concrete. From the creep tests under three different stress loading paths, it can be seen that compared with the rock compression creep, the triaxial single-stage compression creep of asphalt concrete takes longer to stabilize. Each level of loading or unloading will increase the strain. The change is faster at the beginning, then tends to be stable, and finally reaches a stable value.

[0061] (2) For the axial compression creep test with constant confining pressure and graded loading, by comparing the creep curves of three different confining pressures, under the total deviatoric stress of 0.65 MPa, the axial strain of the creep test with a confining pressure of 0.5 MPa is 6%, the axial strain of the creep test with a confining pressure of 1.0 MPa is 5.2%, and the axial strain of the creep test with a confining pressure of 1.5 MPa is 5%. This shows that when the same deviatoric stress is loaded, the greater the confining pressure, the smaller the corresponding axial deformation.

[0062] (3) In the creep test of constant axial pressure and graded unloading of confining pressure, the unloading amount of confining pressure at each stage is small and the stabilization time is also short. Like the graded unloading of axial pressure under constant confining pressure, each unloading of confining pressure is equivalent to superimposing a stress on the original axial stress, and the axial strain increases instantaneously.

[0063] (4) The creep test with fixed stress ratio and simultaneous loading of axial pressure and confining pressure is similar to the actual creep curves obtained by the other two loading methods. At each level of loading, the axial strain increases instantaneously and then gradually stabilizes. When the same confining pressure is applied, the axial strain with a large stress ratio is significantly greater than the axial strain with a small stress ratio.

[0064] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An asphalt concrete triaxial creep tester, characterized in that: It comprises a pressure chamber (1), on which a micrometer (2) is installed, and on which an axial loading lever, an oil pressure balance system, a confining pressure system and a volume measurement system are provided; The axial loading lever comprises a steel base, on which a loading lever (11) is mounted, and at both ends of the loading lever (11) an axial force weight (5) and an adjustment weight (12) are respectively mounted; The oil pressure balancing system comprises an oil pressure pump (4) and a pressure gauge (6); The confining pressure system comprises a water pump (8), the end of the water pump (8) is connected to a water tank (9), a piston (15) is installed on one side of the water tank (9), a confining pressure lever (13) is rotatably installed on the end of the piston (15), a confining pressure control weight (3) and a balancing weight (14) are connected to the confining pressure lever (13), and a water pressure gauge (10) is installed on the water tank (9); The volume measurement system comprises a measuring cylinder (7) and a valve.

2. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The oil pressure pump (4) is connected to the pressure chamber (1), and the pressure chamber (1) is connected to the loading lever (11).

3. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The oil pressure pump (4) and the pressure gauge (6) are respectively arranged on both sides of the bottom of the pressure chamber (1), and the oil pressure pump (4) and the pressure gauge (6) are both connected to the bottom of the pressure chamber (1).

4. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: One end of the water pump (8) is connected to the water tank (9), and the other end of the water pump (8) is connected to a water source.

5. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The water tank (9) is connected to the inner cavity of the pressure chamber (1) via a connecting pipe.

6. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The water tank (9) is connected to the measuring cylinder (7).

7. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The pressure gauge (6) is configured as a digital oil pressure gauge.

8. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: One end of the loading lever (11) close to the adjustment weight (12) is rotatably connected to a support frame, and the connection position between the loading lever (11) and the pressure chamber (1) is close to the support frame.

9. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The water pressure gauge (10) is configured as a digital display water pressure gauge.

10. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The top of the water tank (9) is fixedly connected to a stand, and two fixed pulleys are mounted on the stand.

11. The asphalt concrete triaxial creep tester according to claim 10, characterized in that: One end of the confining pressure control weight (3) is fixedly connected to a first connecting rope, and the other end of the first connecting rope is connected to the top end of the confining pressure lever (13).

12. The asphalt concrete triaxial creep tester according to claim 11, characterized in that: One end of the balancing weight (14) is fixedly connected to a second connecting rope, and an end of the second connecting rope is connected to the confining pressure lever (13).

13. The asphalt concrete triaxial creep tester according to claim 12, characterized in that: The first connecting rope and the second connecting rope are respectively arranged on two fixed pulleys.

14. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The valve is installed between the water tank (9) and the measuring cylinder (7).

15. The asphalt concrete triaxial creep tester according to claim 1, characterized in that: The bottom end of the confining pressure lever (13) is movably connected to the water tank (9) via a connecting rod.

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