A self-feed differential settlement test system and test method

Abstract

The present invention discloses a self-fed differential settlement test system and test method, which relate to the technical field of road settlement testing. The present invention includes a test chamber and two soil samples, and also includes: a reaction frame fixedly installed in the test chamber, a vibration table fixedly installed on the reaction frame, and a refrigeration base fixedly installed on the vibration table, the refrigeration base is used to place the two soil samples, and two loading assemblies are provided on the reaction frame, and the loading assemblies are used to apply vertical loads to the soil samples; comprising the following steps: S1: a comprehensive inspection of the entire experimental system before the start of the test. The advantage is that the present invention can test the interface friction of the soil sample under different variables and the deformation and stress generated during the interface shear process, and the obtained test data is more comprehensive and more in line with the actual situation. At the same time, the influence of friction on the test results during the test process can be eliminated, and the accuracy of the test results is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of road settlement testing, and in particular to a self-feeding differential settlement testing system and a testing method. Background Art

[0002] The reconstruction and expansion of existing roads is one of the key directions of highway engineering development. It can greatly alleviate traffic pressure from a functional perspective, and at the same time can greatly save costs and contribute to economic development. At present, the reconstruction and expansion projects mainly adopt the widening of existing roadbeds, bridges, tunnels, etc., so as to increase the lanes of existing roads. During road widening, steps are often excavated on the embankment slopes of the existing roadbed, and then the existing roadbed is re-filled on both sides. After the filling is completed, the top surface road surface is widened.

[0003] During the filling process, there is a contact surface between the roadbed of the new and old roads. Although steps are set on the embankment slope of the old roadbed, the width of the entire filling is much larger than the width of the steps. In terms of proportion, there is an obvious contact surface between the new and old filling projects. The stability of the contact surface has an important impact on the safe operation of the newly widened highway. It is mainly manifested in that the sliding of the new and old filling projects on the interface causes the top of the filling roadbed to crack, and then causes the entire road surface to crack. After the road surface cracks, rainwater can easily penetrate into the roadbed through the cracks, posing a serious threat to the safety of the entire roadbed.

[0004] Therefore, it is necessary to design a self-fed differential settlement test system and test method to test the differential settlement and contact surface shear force parameters of different adjacent rock and soil bodies, provide direct technical guidance for highway reconstruction and expansion projects, and ensure the safety of the later operation of the reconstruction and expansion roads. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a self-feeding differential settlement testing system and testing method, which solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A self-feed differential settlement testing system includes a testing chamber and two soil samples, and further includes:

[0008] A reaction frame is fixedly installed in the test room, a vibration table is fixedly installed on the reaction frame, and a refrigeration base is fixedly installed on the vibration table, the refrigeration base is used to place two soil samples, and two loading assemblies are provided on the reaction frame, and the loading assemblies are used to apply vertical loads to the soil samples;

[0009] A support test section, which is used to position and support two soil samples and test the interface shear force and lateral deformation of the two soil samples under different loads. The support test section includes two clamping plates installed on a reaction frame through an adjustment component, and a plurality of vertical rods are fixedly installed at the bottom of the two clamping plates. A plurality of test units are provided on each of the vertical rods. A grease coating component and a simulation component are provided on the two clamping plates. The grease coating component is used to apply grease at the contact position between the soil sample and the clamping plate. The simulation component is used to provide simulated support for the side of the soil sample. A driving component for driving the grease coating component and the simulation component is provided on the clamping plate.

[0010] Refrigeration equipment, the refrigeration equipment is used to refrigerate the soil sample, and the refrigeration equipment is installed in the test room;

[0011] Humidification equipment, the humidification equipment is used to control the humidity of the soil sample, and the humidification equipment is installed on the refrigeration equipment;

[0012] The temperature control device is used to control the temperature in the test chamber, and the temperature control device is installed on the side wall of the test chamber.

[0013] Furthermore, the adjustment assembly consists of a servo motor, a bidirectional screw, two mounting rods and two connecting rods. The two mounting rods are fixedly mounted on the reaction frame, the servo motor is fixedly mounted on one of the reaction frames, the bidirectional screw is fixedly connected to the output end of the servo motor, the two connecting rods are threadedly mounted on the bidirectional screw, and the two connecting rods are respectively fixedly connected to the corresponding splints.

[0014] Furthermore, the loading assembly consists of a loading cylinder and a top cap. The loading cylinder is fixedly mounted on the reaction frame. The top cap is fixedly connected to the output end of the loading cylinder, and the top cap corresponds to the position of the soil sample.

[0015] Furthermore, the grease coating assembly consists of a storage chamber, a piston plate and a plurality of nozzles. The storage chamber is opened in a splint, and the piston plate is sealingly and slidingly installed in the storage chamber. The plurality of nozzles are fixedly installed on one end of the splint close to the soil sample, and the end of each nozzle located in the storage chamber is slidingly and sealingly matched with the piston plate.

[0016] Furthermore, the simulation component consists of side plates, airbags, pressure boxes, connecting pipes and piston plates 2. Multiple side plates are fixedly installed on the bottom of the splint, and each side plate is installed with an airbag at the end close to the soil sample. A pressure box is fixedly installed on the side wall of the splint away from the soil sample. The piston plate 2 is sealed and slidably installed in the pressure box. Connecting pipes are fixedly connected between the end of the pressure box away from the splint and the corresponding airbag.

[0017] Furthermore, the driving assembly consists of push rod 1, push rod 2, a contact plate and a spring. The contact plate is slidably installed on the end of the splint close to the soil sample. The push rod 1 is fixedly installed between the contact plate and the piston plate 1, and the push rod 1 is sealed and slidably connected to the splint. The spring is installed between the contact plate and the splint. The push rod 2 is fixedly installed between the piston plate 1 and the piston plate 2, and the push rod 2 is sealed and slidably connected to the splint and the pressure box.

[0018] Furthermore, the refrigeration equipment consists of a refrigeration body, a coolant outlet, a coolant inlet, a coolant addition port, a control panel and a discharge port. The coolant outlet and the coolant inlet are fixedly connected between the refrigeration body and the refrigeration base. The coolant addition port is arranged at the upper end of the refrigeration body, the discharge port is arranged on the side wall of the refrigeration body, and the control panel is installed at the front end of the refrigeration body.

[0019] Furthermore, the humidifying device is composed of a humidifying body, a digital display panel, an adjusting knob, a water tank, a water outlet pipe, a wastewater tank and a drain pipe. The digital display panel and the adjusting knob are both arranged at the front end of the humidifying body, the water tank and the wastewater tank are both arranged in the humidifying body, the water outlet pipe is connected between the water tank and the refrigeration base, and the wastewater tank is connected between the wastewater tank and the refrigeration base.

[0020] Furthermore, the front hinge of the test chamber is connected to a sealed door, a ventilation fan is installed on the top of the test chamber, and a ventilation slot cooperating with the ventilation fan is opened on the top of the test chamber. The temperature control equipment consists of a temperature control box, a display screen, a temperature control knob, a wiring duct and an electric heating plate. The electric heating plate is fixedly installed on the inner wall of the test chamber, the display screen and the temperature control knob are both installed at the front end of the temperature control box, and the wiring duct is installed between the electric heating plate and the temperature control box.

[0021] A self-feed differential sedimentation test method, using the above-mentioned self-feed differential sedimentation test system, includes the following steps:

[0022] S1: Before the start of the experiment, conduct a comprehensive inspection of the entire experimental system. First, check whether the loading cylinder, servo motor, refrigeration equipment, humidification equipment, and temperature control equipment are operating normally. If they are operating normally, you can start the experimental preparation. If there are any abnormalities, solve the abnormalities first.

[0023] S2: Take two square soil samples with dimensions of 100 mm × 100 mm × 200 mm, and a permeable stone with dimensions of 200 mm × 100 mm × 20 mm. Place the permeable stone on a refrigeration base. Place the two soil samples side by side on top of the permeable stone. Use a marker to divide the 200 mm high soil sample into 20 equal parts.

[0024] S3: Start the servo motor to rotate the bidirectional screw, driving the two clamps to move closer to each other, so as to push the two soil samples closer and fix their positions. When the clamp approaches the soil sample, the contact plate on it first contacts the soil sample. During the continuous movement of the clamp, the contact plate overcomes the elastic force of the spring and moves toward the end close to the clamp. At this time, the grease in the storage chamber is squeezed out from the multiple nozzles under the action of pressure and coated on the position where the soil sample is about to contact the clamp. At the same time, multiple air bags begin to expand and maintain flexible support on the side of the soil sample when the clamp completes the fixation of the soil sample.

[0025] S4: Start the two loading cylinders to apply the same vertical load to the two soil samples, and test the settlement of the soil samples under different loads. By adjusting the loads applied by the two loading cylinders, the interfacial shear force of the two soil samples can be tested. By starting the refrigeration equipment, the settlement of the soil samples in a freeze-thaw environment can be tested. By starting the humidification equipment, the settlement of the soil samples in different humidity environments can be tested. By starting the temperature control equipment, the settlement of the soil samples at different temperatures can be tested. By starting the vibration table, the settlement of the soil samples in a dynamic environment can be tested. When testing the settlement of the soil samples in a dynamic environment, first remove the permeable stone from the refrigeration base.

[0026] S5: Based on the test data under different variable conditions, the differential settlement test results of the soil samples are obtained. After completing the experiment, first ensure that the test data are saved, then raise the temperature in the test room to room temperature, then turn off the humidification equipment and temperature control equipment, and then start the ventilation fan for ventilation. Then let the loading cylinder rise and reset, and finally open the sealed door to take out the soil sample completely and measure the side deformation of the soil sample according to the set mark. The entire experimental process is completed.

[0027] Compared with the existing technology, the advantages of the present invention are:

[0028] 1: Through the coordination of the loading assembly and multiple displacement sensors set on the sides, the friction force at the interface of different rock and soil masses, as well as the deformation and stress generated during the interface shear process, can be tested. At the same time, the experimental variables can be adjusted differently. The test data obtained is more comprehensive and more in line with the actual situation. It can provide direct technical guidance for the highway reconstruction and expansion project, and ensure the safety of the later operation of the reconstruction and expansion road.

[0029] 2: Through the cooperation of the splint and the grease assembly, the two soil samples can be effectively fixed and the contact surfaces of the two can be stably fitted. At the same time, the contact surfaces of the soil sample and the splint can be lubricated during the fixing process to avoid the friction between the two affecting the accuracy of the test results.

[0030] 3: Through the design of simulation components, when using the splint to fix the soil sample, stable flexible support can be automatically provided to the side of the soil sample, which can better simulate the actual situation of the soil sample on the road and further improve the matching degree between the test results and the actual situation.

[0031] In summary, the present invention can test the interface friction of soil samples under different variables as well as the deformation and stress generated during the interface shear process. The obtained test data is more comprehensive and more in line with the actual situation. At the same time, it can eliminate the influence of friction on the test results during the test process, effectively ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a self-feed differential settlement testing system proposed by the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the structure after the middle sealing door is opened;

[0034] Figure 3 for Figure 2 Structural diagram from another perspective;

[0035] Figure 4 for Figure 2 A magnified schematic diagram of the structure at the middle vibration table;

[0036] Figure 5 for Figure 2 An enlarged schematic diagram of the structure of the refrigeration equipment;

[0037] Figure 6 for Figure 2 A schematic diagram of the structure of the medium humidification equipment;

[0038] Figure 7 for Figure 1 An enlarged schematic diagram of the structure of the medium temperature control equipment;

[0039] Figure 8 for Figure 4 Schematic diagram of the structure with the splint removed;

[0040] Figure 9 for Figure 4 An enlarged schematic diagram of the structure at the middle splint;

[0041] Figure 10 for Figure 9 A schematic diagram of the structure from another perspective at one of the splints;

[0042] Figure 11 for Figure 10 Front view of

[0043] Figure 12 for Figure 11 Schematic diagram of the structure of the AA surface;

[0044] Figure 13 for Figure 12 Schematic diagram of the enlarged structure of part a.

[0045] In the figure: 1. Test chamber; 2. Soil sample; 3. Reaction frame; 4. Vibration table; 5. Refrigeration base; 6. Loading cylinder; 7. Top cap; 8. Mounting rod; 9. Servo motor; 10. Bidirectional screw; 11. Connecting rod; 12. Clamp; 13. Vertical rod; 14. Test unit; 15. Refrigeration equipment; 151. Refrigeration unit; 152. Coolant outlet; 153. Coolant inlet; 154. Coolant addition port; 155. Control panel; 156. Drain port; 16. Humidifier; 161. Humidifier unit; 162. Digital display panel. 163. Adjustment knob; 164. Water storage tank; 165. Water outlet pipe; 166. Wastewater tank; 167. Drain pipe; 17. Temperature control equipment; 171. Temperature control box; 172. Display screen; 173. Temperature control knob; 174. Wiring duct; 18. Sealing door; 19. Ventilation fan; 20. Ventilation slot; 21. Storage chamber; 22. Nozzle; 23. Piston plate 1; 24. Push rod 1; 25. Contact plate; 26. Spring; 27. Side plate; 28. Air bag; 29. ​​Pressure box; 30. Connecting pipe; 31. Piston plate 2; 32. Push rod 2. DETAILED DESCRIPTION

[0046] Reference Figures 1-13 A self-fed differential settlement test system includes a test chamber 1 and two soil samples 2, and also includes a reaction frame 3 fixedly installed in the test chamber 1. The reaction frame 3 is used to provide stable support to ensure that the reaction force during the loading process is balanced. A vibration table 4 is fixedly installed on the reaction frame 3. The vibration table 4 is an existing product. When working, it is used to simulate vibration conditions, apply dynamic loads, and study the influence of vibration on the settlement of soil samples 2. The specific structure and working principle are not elaborated here.

[0047] A refrigeration base 5 is fixedly installed on the vibration table 4. The refrigeration base 5 is used to place two soil samples 2. The refrigeration base 5 can adjust the temperature of the soil sample 2 so that it can be tested in a low temperature environment. The refrigeration equipment 15 is used to refrigerate the soil sample 2. The refrigeration equipment 15 is installed in the test chamber 1. The refrigeration equipment 15 consists of a refrigeration body 151, a coolant outlet 152, a coolant inlet 153, a coolant addition port 154, a control panel 155 and a discharge port 156. The coolant outlet 152 and the coolant inlet 153 are both fixedly connected between the refrigeration body 151 and the refrigeration base 5. The coolant addition port 154 is arranged at the upper end of the refrigeration body 151, and the discharge port 156 is arranged on the side wall of the refrigeration body 151. The control panel 155 is installed at the front end of the refrigeration body 151. The refrigeration equipment 15 is designed to flow the coolant between the refrigeration body 151 and the refrigeration base 5.

[0048] Humidifier 16, humidifier 16 is used to control the humidity of soil sample 2, humidifier 16 is installed on refrigeration equipment 15, humidifier 16 consists of humidifier body 161, digital display panel 162, adjustment knob 163, water reservoir 164, water outlet pipe 165, wastewater tank 166 and drain pipe 167, the digital display panel 162 and adjustment knob 163 are both arranged at the front end of humidifier body 161, water reservoir 164 and wastewater tank 166 are both arranged in humidifier body 161, water outlet pipe 165 is connected between water reservoir 164 and refrigeration base 5, wastewater tank 166 is connected between wastewater tank 166 and refrigeration base 5, humidifier 16 is designed to flow and extract water in refrigeration base 5, so as to control the humidity of soil sample 2, and at the same time, in conjunction with the use of refrigeration equipment 15, soil sample 2 can be tested in freeze-thaw environment.

[0049] Temperature control device 17, temperature control device 17 is used to control the temperature in the test chamber 1, the temperature control device 17 is installed on the side wall of the test chamber 1, the temperature control device 17 consists of a temperature control box 171, a display screen 172, a temperature control knob 173, a wiring pipe 174 and an electric heater, the electric heater is fixedly installed on the inner wall of the test chamber 1, the display screen 172 and the temperature control knob 173 are both installed at the front end of the temperature control box 171, the wiring pipe 174 is installed between the electric heater and the temperature control box 171, the temperature control device 17 is used to test the soil sample 2 in a high temperature environment.

[0050] Two loading components are provided on the reaction frame 3. The loading components are used to apply vertical load to the soil sample 2. The loading components consist of a loading cylinder 6 and a top cap 7. The loading cylinder 6 is fixedly mounted on the reaction frame 3. The top cap 7 is fixedly connected to the output end of the loading cylinder 6. The top cap 7 corresponds to the position of the soil sample 2. When the loading cylinder 6 is running, a uniform load is applied to the upper surface of the soil sample 2 through the top cap 7.

[0051] The support test section is used to position and support the two soil samples 2 and test the interface shear force and lateral deformation of the two soil samples 2 under different loads. The support test section includes two splints 12 installed on the reaction frame 3 through an adjustment component, and a plurality of vertical rods 13 are fixedly installed at the bottom of the two splints 12. Each vertical rod 13 is provided with a plurality of test units 14. The test unit 14 is an existing displacement sensor. When the soil sample 2 settles under the action of the load, the data change of the displacement sensor can be used to know the settlement amount of different points on the side of the soil sample 2. The displacement sensor is an existing product, and the working principle and specific structure are not explained here. When the two splints 12 are fitted together, a square shape is formed, which is used to fix the upper ends of the two soil samples 2 and make the two soil samples 2 fit effectively.

[0052] The adjustment assembly consists of a servo motor 9, a bidirectional screw 10, two mounting rods 8 and two connecting rods 11. The two mounting rods 8 are fixedly mounted on the reaction frame 3. The servo motor 9 is fixedly mounted on one of the reaction frames 3. The bidirectional screw 10 is fixedly connected to the output end of the servo motor 9. The two connecting rods 11 are threadedly mounted on the bidirectional screw 10, and the two connecting rods 11 are fixedly connected to the corresponding clamping plates 12 respectively. The servo motor 9 is an existing product, and its working principle and specific structure are not explained here. The servo motor 9 can rotate in different directions as needed, so that the bidirectional screw 10 drives the two clamping plates 12 closer or farther away from each other, thereby realizing the fixation and separation of the soil sample 2.

[0053] Both clamps 12 are provided with a grease coating component and a simulation component. The grease coating component is used to apply grease to the contact position between the soil sample 2 and the clamp 12. Since the soil sample 2 will move relative to the clamp 12 when a load is applied to the soil sample 2, in order to apply grease to the contact position between the soil sample 2 and the clamp 12, it can effectively avoid the friction between the soil sample 2 and the clamp 12 affecting the settlement test results, thereby ensuring the accuracy of the test results.

[0054] The simulation component is used to provide simulated support for the side of soil sample 2. In a real environment, the side of the roadbed is supported by soil rather than fixed support. Therefore, the use of simulated support can further improve the matching degree between the test results and the actual data.

[0055] The grease application assembly consists of a storage chamber 21, a piston plate 23 and a plurality of nozzles 22. The storage chamber 21 is opened in the clamping plate 12, and the piston plate 23 is sealed and slidably installed in the storage chamber 21. The plurality of nozzles 22 are fixedly installed on the end of the clamping plate 12 close to the soil sample 2, and the end of each nozzle 22 located in the storage chamber 21 is slidably and sealedly matched with the piston plate 23. When the piston plate 23 moves in the storage chamber 21 toward the end away from the soil sample 2, the grease installed in the storage chamber 21 can be passed through the plurality of nozzles. 22 is extruded, and as the splint 12 clamps the soil sample 2, the extruded grease will spread outward under the extrusion action, so that when the splint 12 contacts the soil sample 2, the grease is automatically coated on the contact position between the soil sample 2 and the splint 12, without the need for additional operation by the experimenter. A feeding port is provided on the top of the splint 12, and the feeding port is located at the end of the storage chamber 21 away from the soil sample 2. A sealing plug is sealed on the feeding port, and the design of the feeding port is used to replenish the grease in the storage chamber 21.

[0056] The simulation component consists of side plates 27, air bags 28, pressure boxes 29, connecting pipes 30 and piston plates 2 31. Multiple side plates 27 are fixedly installed on the bottom of the splint 12. Each side plate 27 is installed with an air bag 28 at the end close to the soil sample 2. A pressure box 29 is fixedly installed on the side wall of the end of the splint 12 away from the soil sample 2. The piston plate 2 31 is sealed and slidably installed in the pressure box 29. The end of the pressure box 29 away from the splint 12 and the corresponding air bag 28 are fixedly connected with connecting pipes 30. When the piston plate 2 31 moves in the pressure box 29 toward the end away from the soil sample 2, the gas in the pressure box 29 can be input into the air bag 28 through the connecting pipe 30, so that the air bag 28 expands to flexibly support the side of the soil sample 2.

[0057] The clamping plate 12 is provided with a driving assembly for driving the grease coating assembly and the simulation assembly. The driving assembly consists of a push rod 1 24, a push rod 2 32, a contact plate 25 and a spring 26. The contact plate 25 is slidably mounted on the end of the clamping plate 12 close to the soil sample 2. The push rod 1 24 is fixedly mounted between the contact plate 25 and the piston plate 1 23, and the push rod 1 24 is sealed and slidably connected to the clamping plate 12. The spring 26 is mounted between the contact plate 25 and the clamping plate 12, and the push rod 2 32 is fixedly mounted between the piston plate 1 23 and the piston plate 2 31, and the push rod 2 32 is sealed and slidably connected to the clamping plate 12 and the pressure box 29. When the clamping plate 12 clamps the soil sample 2, the contact plate 25 will first contact the soil sample 2 and drive the piston plate 1 23 and the piston plate 2 31 to move toward the end away from the soil sample 2 at the same time under the continuous movement of the clamping plate 12. At this time, it can automatically provide drive for the operation of the grease coating assembly and the simulation assembly, without the need to set up an additional power source, reducing the experimental cost and having a high degree of automation.

[0058] The front hinge of the test chamber 1 is connected to a sealed door 18, a ventilation fan 19 is installed on the top of the test chamber 1, and a ventilation slot 20 is provided on the top of the test chamber 1 to cooperate with the ventilation fan 19. The ventilation fan 19 is an existing product. When it is working, it discharges the gas in the test chamber 1 to the outside to realize ventilation of the test chamber 1. The design of the sealed door 18 facilitates the installation and removal of the soil sample 2.

[0059] In the present invention, a self-feed differential settlement test method comprises the following steps:

[0060] S1: Before the start of the experiment, conduct a comprehensive inspection of the entire experimental system. First, check whether the loading cylinder 6, servo motor 9, refrigeration equipment 15, humidification equipment 16 and temperature control equipment 17 can operate normally. If they can operate normally, you can start the experimental preparation. If there are any abnormalities in operation, solve the abnormalities first.

[0061] S2: Take two square soil samples 2 with dimensions of 100 mm × 100 mm × 200 mm, and a permeable stone with dimensions of 200 mm × 100 mm × 20 mm. Place the permeable stone on the refrigeration base 5. Then, place the two soil samples 2 side by side on top of the permeable stone. Use a marker to divide the 200 mm high soil sample 2 into 20 equal parts.

[0062] S3: Start the servo motor 9 to rotate the bidirectional screw 10 and drive the two clamps 12 to approach each other, so as to push the two soil samples 2 closer and fix their positions. When the clamp 12 approaches the soil sample 2, the contact plate 25 thereon first contacts the soil sample 2. During the continuous movement of the clamp 12, the contact plate 25 overcomes the elastic force of the spring 26 and moves toward the end close to the clamp 12. At this time, the grease in the storage chamber 21 is squeezed out from the multiple nozzles 22 under the action of pressure and coated on the position where the soil sample 2 is about to contact the clamp 12. At the same time, the multiple air bags 28 begin to expand and maintain flexible support on the side of the soil sample 2 when the clamp 12 completes the fixation of the soil sample 2.

[0063] S4: Start the two loading cylinders 6 to apply the same vertical load to the two soil samples 2, test the settlement of the soil samples 2 under different loads, adjust the loads applied by the two loading cylinders 6, and test the interfacial shear force of the two soil samples 2. Start the refrigeration device 15 to test the settlement of the soil sample 2 in a freeze-thaw environment. Start the humidification device 16 to test the settlement of the soil sample 2 in different humidity environments. Start the temperature control device 17 to test the settlement of the soil sample 2 at different temperatures. Start the vibration table 4 to test the settlement of the soil sample 2 in a dynamic environment. When testing the settlement of the soil sample 2 in a dynamic environment, first remove the permeable stone from the refrigeration base 5.

[0064] S5: Based on the test data under different variable conditions, the differential settlement test results of soil sample 2 are obtained. After completing the experiment, first ensure that the test data are saved, then raise the temperature in the test room 1 to room temperature, then turn off the humidification equipment 16 and the temperature control equipment 17, and then start the ventilation fan 19 for ventilation. Then let the loading cylinder 6 rise and reset, and finally open the sealing door 18 to take out the soil sample 2 completely and measure the side deformation of the soil sample 2 according to the set mark. The entire experimental process is completed.

[0065] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A self-feed differential settlement test system, comprising a test chamber (1) and two soil samples (2), characterized in that: Also includes: A reaction frame (3) is fixedly mounted in a test chamber (1), a vibration table (4) is fixedly mounted on the reaction frame (3), and a refrigeration base (5) is fixedly mounted on the vibration table (4), the refrigeration base (5) is used to place two soil samples (2), and two loading assemblies are provided on the reaction frame (3), and the loading assemblies are used to apply vertical loads to the soil samples (2); A support test section, the support test section is used to position and support two soil samples (2) and test the interface shear force and side deformation of the two soil samples (2) under different loads, the support test section includes two clamping plates (12) installed on the reaction frame (3) through an adjustment component, and a plurality of vertical rods (13) are fixedly installed at the bottom of the two clamping plates (12), and each of the vertical rods (13) is provided with a plurality of test units (14), and the two clamping plates (12) are provided with a grease component and a simulation component, the grease component is used to apply grease at the contact position between the soil sample (2) and the clamping plate (12), and the simulation component is used to provide simulated support for the side of the soil sample (2), and the clamping plate (12) is provided with a drive component for driving the grease component and the simulation component; The grease coating assembly consists of a storage chamber (21), a piston plate (23), and a plurality of nozzles (22); the storage chamber (21) is opened in the clamping plate (12); the piston plate (23) is sealingly and slidably mounted in the storage chamber (21); the plurality of nozzles (22) are fixedly mounted on one end of the clamping plate (12) close to the soil sample (2); and the end of each nozzle (22) located in the storage chamber (21) is slidingly and sealingly matched with the piston plate (23); A refrigeration device (15), the refrigeration device (15) is used to refrigerate the soil sample (2), and the refrigeration device (15) is installed in the test chamber (1); A humidifying device (16), the humidifying device (16) is used to control the humidity of the soil sample (2), and the humidifying device (16) is installed on the refrigeration device (15); A temperature control device (17) is used to control the temperature in the test chamber (1), and the temperature control device (17) is installed on the side wall of the test chamber (1).

2. A self-feed differential sedimentation testing system according to claim 1, characterized in that: The adjustment assembly consists of a servo motor (9), a bidirectional lead screw (10), two mounting rods (8) and two connecting rods (11), the two mounting rods (8) are fixedly mounted on the reaction frame (3), the servo motor (9) is fixedly mounted on one of the reaction frames (3), the bidirectional lead screw (10) is fixedly connected to the output end of the servo motor (9), the two connecting rods (11) are threadedly mounted on the bidirectional lead screw (10), and the two connecting rods (11) are respectively fixedly connected to the corresponding clamping plates (12).

3. A self-feed differential sedimentation testing system according to claim 2, characterized in that: The loading assembly consists of a loading cylinder (6) and a top cap (7), wherein the loading cylinder (6) is fixedly mounted on the reaction frame (3), and the top cap (7) is fixedly connected to the output end of the loading cylinder (6), and the top cap (7) corresponds to the position of the soil sample (2).

4. A self-feed differential sedimentation testing system according to claim 3, characterized in that: The simulation component consists of a side plate (27), an air bag (28), a pressure box (29), a connecting pipe (30) and a second piston plate (31). A plurality of side plates (27) are fixedly mounted on the bottom of the clamping plate (12). An air bag (28) is mounted on the end of each side plate (27) close to the soil sample (2). A pressure box (29) is fixedly mounted on the side wall of the end of the clamping plate (12) away from the soil sample (2). The second piston plate (31) is sealingly slidably mounted in the pressure box (29). A connecting pipe (30) is fixedly connected between the end of the pressure box (29) away from the clamping plate (12) and the corresponding air bag (28).

5. A self-feed differential sedimentation testing system according to claim 4, characterized in that: The driving assembly consists of a push rod 1 (24), a push rod 2 (32), a contact plate (25) and a spring (26), wherein the contact plate (25) is slidably mounted on one end of the clamping plate (12) close to the soil sample (2), the push rod 1 (24) is fixedly mounted between the contact plate (25) and the piston plate 1 (23), and the push rod 1 (24) is sealed and slidably connected to the clamping plate (12), the spring (26) is mounted between the contact plate (25) and the clamping plate (12), the push rod 2 (32) is fixedly mounted between the piston plate 1 (23) and the piston plate 2 (31), and the push rod 2 (32) is sealed and slidably connected to the clamping plate (12) and the pressure box (29).

6. The self-feed differential sedimentation testing system according to claim 5, characterized in that: The refrigeration device (15) is composed of a refrigeration body (151), a coolant outlet (152), a coolant inlet (153), a coolant addition port (154), a control panel (155), and a discharge port (156). The coolant outlet (152) and the coolant inlet (153) are fixedly connected between the refrigeration body (151) and the refrigeration base (5). The coolant addition port (154) is arranged at the upper end of the refrigeration body (151), the discharge port (156) is arranged on the side wall of the refrigeration body (151), and the control panel (155) is installed at the front end of the refrigeration body (151).

7. The self-feed differential sedimentation testing system according to claim 6, characterized in that: The humidifying device (16) is composed of a humidifying body (161), a digital display panel (162), an adjusting knob (163), a water reservoir (164), a water outlet pipe (165), a wastewater reservoir (166) and a drain pipe (167). The digital display panel (162) and the adjusting knob (163) are both arranged at the front end of the humidifying body (161). The water reservoir (164) and the wastewater reservoir (166) are both arranged in the humidifying body (161). The water outlet pipe (165) is connected between the water reservoir (164) and the refrigeration base (5). The wastewater reservoir (166) is connected between the wastewater reservoir (166) and the refrigeration base (5).

8. The self-feed differential sedimentation testing system according to claim 7, characterized in that: The front hinge of the test chamber (1) is connected to a sealed door (18), a ventilation fan (19) is installed on the top of the test chamber (1), and a ventilation slot (20) is opened on the top of the test chamber (1) to match the ventilation fan (19). The temperature control device (17) consists of a temperature control box (171), a display screen (172), a temperature control knob (173), a wiring duct (174) and an electric heater. The electric heater is fixedly installed on the inner wall of the test chamber (1), the display screen (172) and the temperature control knob (173) are both installed at the front end of the temperature control box (171), and the wiring duct (174) is installed between the electric heater and the temperature control box (171).

9. A self-fed differential sedimentation test method, using the self-fed differential sedimentation test system according to claim 8, characterized in that: The following steps are involved: S1: Before the start of the experiment, conduct a comprehensive inspection of the entire experimental system. First, check whether the loading cylinder (6), servo motor (9), refrigeration equipment (15), humidification equipment (16) and temperature control equipment (17) can operate normally. If they can operate normally, then start the experimental preparation. If there are any abnormal operation problems, solve the abnormal problems first. S2: Take two square soil samples (2) with dimensions of 100mm×100mm×200mm in length, width and height, and take a permeable stone with dimensions of 200mm×100mm×20mm in length, width and height, and place the permeable stone on the cooling base (5). Then, place the two soil samples (2) side by side on top of the permeable stone, and use a marker to divide the 200mm high soil sample (2) into 20 equal parts; S3: Start the servo motor (9) to rotate the bidirectional screw (10) to drive the two clamps (12) to approach each other, so as to achieve the pushing and approaching and position fixing of the two soil samples (2). When the clamp (12) approaches the soil sample (2), the contact plate (25) thereon first contacts the soil sample (2). During the continuous movement of the clamp (12), the contact plate (25) overcomes the elastic force of the spring (26) and moves toward one end close to the clamp (12). At this time, the grease in the storage chamber (21) is squeezed out from the multiple nozzles (22) under the action of pressure and coated on the position where the soil sample (2) is about to contact the clamp (12). At the same time, the multiple air bags (28) begin to expand and maintain flexible support on the side of the soil sample (2) when the clamp (12) completes the fixation of the soil sample (2); S4: Start the two loading cylinders (6) so that they apply the same vertical load to the two soil samples (2) and test the settlement of the soil sample (2) under different loads. Adjust the loads applied by the two loading cylinders (6) to test the interface shear force of the two soil samples (2). Start the refrigeration device (15) to test the settlement of the soil sample (2) under a freeze-thaw environment. Start the humidification device (16) to test the settlement of the soil sample (2) under different humidity environments. Start the temperature control device (17) to test the settlement of the soil sample (2) under different temperatures. Start the vibration table (4) to test the settlement of the soil sample (2) under a dynamic environment. When testing the settlement of the soil sample (2) under a dynamic environment, first remove the permeable stone from the refrigeration base (5). S5: Based on the test data under different variable conditions, the differential settlement test results of the soil sample (2) are obtained. After the experiment is completed, first ensure that the test data are saved, then raise the temperature in the test room (1) to room temperature, then turn off the humidification equipment (16) and the temperature control equipment (17), and then start the ventilation fan (19) for ventilation. Then let the loading cylinder (6) rise and reset, and finally open the sealing door (18) to completely take out the soil sample (2) and measure the side deformation of the soil sample (2) according to the mark made by the marker. The entire experimental process is completed.

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