An el-nsm modified soil dry-wet cycle test equipment

Abstract

The utility model relates to modified soil test technique technical field, concretely is a kind of EL-NSM modified soil dry-wet cycle test equipment, including test case, the inside fixedly connected with support plate of test case, is equipped with support notch on support plate, the inner wall of support notch is inclined from top to bottom and is arranged, and overflow notch is all equipped with on support plate and located the periphery of support notch;Support frame is arranged on support plate, and the outer surface of support frame is inclined and is arranged, and the outer surface of support frame and the inner wall of support notch are matched, the utility model can be watered by permeating micropore when to EL-NSM modified soil dry-wet cycle test, cooperate infrared radiation heating lamp simulation sunlight and dry EL-NSM modified soil, can better simulate the complete cycle of precipitation infiltration into ground in natural environment, obtain more real and reliable test data, avoid EL-NSM modified soil bottom unable to water, cause moisture to accumulate in lower part in soil.

Description

Technical Field

[0001] This utility model relates to the field of modified soil testing technology, specifically an EL-NSM modified soil wet-dry cycle testing device. Background Technology

[0002] To control the wetting, softening, and strength degradation of roadbeds during the operational period in the lower reaches of the Yellow River (Shandong) and to maintain the long-term service performance of the roadbeds in this region, a new material for roadbed drainage control, EL-NSM modified soil, was developed. To study the evolution of the hydrophobicity and strength of EL-NSM modified soil under wet-dry cycle conditions, an optimal EL-NSM dosage design method was proposed, which requires wet-dry cycle tests on EL-NSM modified soil.

[0003] In the prior art, such as the dry-wet cycle simulation device and method for the effect of dispersible soil modification proposed in patent application number "CN202410499680.X", a slope is set on the inner wall of the bottom of the box and dispersible soil and modified soil are respectively set on both sides of the top of the slope. The slope is made of dispersible soil and the test conditions such as temperature and humidity are simulated by humidification components, heating components and auxiliary components.

[0004] However, in the aforementioned patent application, water cannot seep into the bottom of the soil during the wet-dry cycle test, which easily leads to the accumulation of water in the lower part of the soil, forming a non-uniform humidity field. This cannot accurately simulate the environment when EL-NSM modified soil is used as a roadbed, thus affecting the accuracy of the test results. Utility Model Content

[0005] The purpose of this invention is to provide a wet-dry cycle test device for EL-NSM modified soil to solve the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved through the following technical solutions: A wet-dry cycle test device for EL-NSM modified soil includes a test chamber. A support plate is fixedly connected inside the test chamber. A support slot is provided on the support plate. The inner wall of the support slot is inclined from top to bottom. An overflow slot is provided on the support plate and around the support slot. A support frame is provided on the support plate. The outer surface of the support frame is inclined and is adapted to the inner wall of the support groove. A bearing plate is fixedly connected inside the support frame. The top of the bearing plate is used to hold EL-NSM modified soil. Multiple permeable micropores are evenly opened on the bearing plate for water infiltration of EL-NSM modified soil.

[0007] Preferably, a water collection chamber is fixedly connected to the bottom of the inner wall of the test chamber. The water collection chamber is located below the support plate and is used to collect water flowing down from the overflow trough and the permeation micropores.

[0008] Preferably, an infrared radiation heating lamp is fixedly installed on the inner wall of the test chamber and above the support plate. The infrared radiation heating lamp is used to heat and dry the EL-NSM modified soil.

[0009] Preferably, a rubber bonding pad is fixedly connected to the inner surface of the support groove, and the rubber bonding pad is in contact with the outer surface of the support frame.

[0010] Preferably, a circulation pump is fixedly installed on the outside of the test chamber, and an inlet pipe is fixedly installed at the inlet of the circulation pump. One end of the inlet pipe passes through the test chamber and the water collection tank and extends into the interior of the water collection tank.

[0011] Preferably, the outlet of the circulating pump is fixedly connected to a U-shaped pipe, both ends of which extend into the interior of the test chamber. Multiple spray heads are fixedly installed at the bottom of the U-shaped pipe and inside the test chamber. The U-shaped pipe and the spray heads are positioned above the support plate.

[0012] The beneficial effects of this utility model are: This invention, during the wet-dry cycle test of EL-NSM modified soil, allows water to seep through the bottom of the soil via permeable micropores. Combined with an infrared radiation heating lamp to simulate the drying effect of sunlight on the EL-NSM modified soil, it can better simulate the complete cycle of precipitation infiltration into the ground in the natural environment, obtaining more realistic and reliable test data. This avoids the situation where the bottom of the EL-NSM modified soil cannot seep through, causing water to accumulate in the lower part of the soil, forming a non-uniform humidity field, which affects the accuracy of the test results. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a utility model Figure 1 Schematic diagram of the internal structure of the intermediate test chamber; Figure 3 This is a utility model Figure 1 A schematic diagram showing the connection between the middle support plate and the support frame; Figure 4 This is a utility model Figure 3 Schematic diagram of the middle support plate; Figure 5 This is a utility model Figure 3 A schematic diagram of the structure at the bottom of the central support frame.

[0014] The attached figures are labeled as follows: 1. Test chamber; 101. Exhaust port; 2. Support plate; 201. Support groove; 202. Overflow groove; 3. Support frame; 4. Bearing plate; 401. Permeation micropores; 5. Water collection tank; 6. Infrared radiation heating lamp; 7. Rubber bonding pad; 8. Circulation pump; 9. Water inlet pipe; 10. U-shaped pipe; 11. Spray head. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 A wet-dry cycle test device for EL-NSM modified soil includes a test chamber 1. The test chamber 1 is made of thermal insulation material. The outside of the test chamber 1 is equipped with an openable door. The inside of the door has sealing rubber, which can seal the opening of the door when the test chamber 1 is closed. The top of the test chamber 1 is fixedly connected to an exhaust port 101, which can discharge the steam generated during the drying process of EL-NSM modified soil. like Figure 1 , Figure 3 and Figure 5 The test chamber 1 is fixedly connected to a support plate 2. The side of the support plate 2 is fixed to the inner wall of the test chamber 1. The support plate 2 has a support slot 201. The inner wall of the support slot 201 is inclined from top to bottom, so that the size of the opening of the support slot 201 gradually decreases from top to bottom. The support plate 2 and the support slot 201 are provided with overflow slots 202 around the support plate 2. like Figure 3 , Figure 4 and Figure 5 A support frame 3 is provided on the support plate 2. The outer surface of the support frame 3 is inclined and the outer surface of the support frame 3 is adapted to the inner wall of the support groove 201, so that the outer surface of the support frame 3 fits against the inner wall of the support groove 201 to provide support for the support frame 3. At this time, the bottom of the support frame 3 can protrude below the support plate 2, and the top of the support frame 3 protrudes above the support plate 2. The support frame 3 is internally fixedly connected to a bearing plate 4. The bearing plate 4 is used to hold EL-NSM modified soil. Multiple permeable micropores 401 are evenly opened on the bearing plate 4. The permeable micropores 401 are used for water infiltration of EL-NSM modified soil.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 The bottom of the inner wall of the test chamber 1 is fixedly connected to a water collection tank 5. The water collection tank 5 is filled with clean water. When the water in the water collection tank 5 is insufficient, the test chamber 1 can be opened to replenish water. The water collection tank 5 is located below the support plate 2 and is used to collect the water flowing down from the overflow trough 202 and the permeation micropores 401.

[0018] like Figure 1 and Figure 2 An infrared radiation heating lamp 6 is fixedly installed on the inner wall of the test chamber 1 and above the support plate 2. The infrared radiation heating lamp 6 is used to heat and dry the EL-NSM modified soil. The infrared radiation heating lamp 6 is existing technology, external power supply, and can simulate the 780–1400nm near-infrared band, which matches the peak value of solar thermal radiation.

[0019] like Figure 1 , Figure 3 and Figure 5 A rubber bonding pad 7 is fixedly connected to the inner surface of the support slot 201. The rubber bonding pad 7 is in contact with the outer surface of the support frame 3. The rubber bonding pad 7 can improve the sealing between the surface of the support frame 3 and the inner wall of the support slot 201.

[0020] like Figure 1 , Figure 3 and Figure 5 A circulation pump 8 is fixedly installed on the outside of the test chamber 1. The circulation pump 8 is existing technology, externally powered, and has an external control switch. A water inlet pipe 9 is fixedly installed at the water inlet of the circulation pump 8. One end of the water inlet pipe 9 passes through the test chamber 1 and the water collection chamber 5 and extends into the interior of the water collection chamber 5. A filter screen (not shown in the figure) is located at the end of the water inlet pipe 9 inside the water collection chamber 5, which can play a filtering role.

[0021] like Figure 1 and Figure 2 The outlet of the circulating pump 8 is fixedly connected to a U-shaped pipe 10, and the connection between the circulating pump 8 and the U-shaped pipe 10 is located at the center of the U-shaped pipe 10, so that after the water enters the U-shaped pipe 10 through the circulating pump 8, it can be split to both ends of the U-shaped pipe 10. Both ends of the U-shaped pipe 10 extend into the interior of the test chamber 1. Multiple spray heads 11 are fixedly installed at the bottom of the U-shaped pipe 10 and inside the test chamber 1. The U-shaped tube 10 and the spray head 11 are positioned above the support plate 2, and both ends of the U-shaped tube 10 and the infrared radiation heating lamp 6 are at the same height.

[0022] The working principle of the EL-NSM modified soil wet-dry cycle test equipment provided by this utility model is as follows: When it is necessary to conduct a wet-dry cycle test on EL-NSM modified soil, the EL-NSM modified soil is placed into the position of the bearing plate 4 in the support frame 3 and leveled so that the EL-NSM modified soil covers the top of the bearing plate 4. Then the support frame 3 is installed on the support plate 2 so that the bottom of the support frame 3 passes through the support slot 201. The inclined design of the support slot 201 and the surface of the support frame 3 makes the support plate 2 provide support for the support frame 3 and the bearing plate 4. The circulating pump 8 starts to draw water from the inside of the water collection chamber 5 through the water inlet pipe 9, and then sprays it out through the U-shaped pipe 10 and the spray head 11 into the EL-NSM modified soil above the support plate 4 to simulate the humidification of the EL-NSM modified soil. Some water seeps into the bottom of the EL-NSM modified soil, and then continues to seep down through the EL-NSM modified soil. Finally, it seeps out through the permeation micropores 401 and flows down into the water collection chamber 5. Some water can flow out along the surface of the EL-NSM modified soil to the outside of the support frame 3, and then flow down into the water collection chamber 5 through the overflow trough 202. After humidification is complete, turn off the circulation pump 8 and turn on the infrared radiation heating lamp 6 to simulate the heating of EL-NSM modified soil by sunlight and dry the EL-NSM modified soil. The EL-NSM modified soil was repeatedly humidified and dried inside test chamber 1 to complete the EL-NSM modified soil wet-dry cycle test.

[0023] Compared with related technologies, the EL-NSM modified soil wet-dry cycle test equipment provided by this utility model has the following beneficial effects: This invention, during the wet-dry cycle test of EL-NSM modified soil, allows water to seep through the bottom of the EL-NSM modified soil via permeable micropores 401. Combined with infrared radiation heating lamps 6 to simulate the drying of EL-NSM modified soil by sunlight, it can better simulate the complete cycle of precipitation infiltrating into the ground in the natural environment, obtaining more realistic and reliable test data. This avoids the situation where water cannot seep through the bottom of the EL-NSM modified soil, causing water to accumulate in the lower part of the soil, forming a non-uniform humidity field, which affects the accuracy of the test results.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A wet-dry cycle test device for EL-NSM modified soil, comprising a test chamber (1), characterized in that, The test chamber (1) is fixedly connected to a support plate (2). A support slot (201) is provided on the support plate (2). The inner wall of the support slot (201) is inclined from top to bottom. An overflow slot (202) is provided on the support plate (2) and around the support slot (201). A support frame (3) is provided on the support plate (2). The outer surface of the support frame (3) is inclined and the outer surface of the support frame (3) is adapted to the inner wall of the support groove (201). A bearing plate (4) is fixedly connected inside the support frame (3). The bearing plate (4) is used to accommodate EL-NSM modified soil. Multiple permeable micropores (401) are evenly opened on the bearing plate (4). The permeable micropores (401) are used for water seepage of EL-NSM modified soil.

2. The EL-NSM modified soil wet-dry cycle test equipment according to claim 1, characterized in that, The bottom of the inner wall of the test chamber (1) is fixedly connected to a water collection tank (5). The water collection tank (5) is located below the support plate (2) and is used to collect the water flowing down from the overflow trough (202) and the permeation micropores (401).

3. The EL-NSM modified soil wet-dry cycle test equipment according to claim 2, characterized in that, An infrared radiation heating lamp (6) is fixedly installed on the inner wall of the test chamber (1) and above the support plate (2). The infrared radiation heating lamp (6) is used to heat and dry the EL-NSM modified soil.

4. The EL-NSM modified soil wet-dry cycle test equipment according to claim 1, characterized in that, A rubber bonding pad (7) is fixedly connected to the inner surface of the support slot (201), and the rubber bonding pad (7) and the outer surface of the support frame (3) are bonded together.

5. The EL-NSM modified soil wet-dry cycle test equipment according to claim 2, characterized in that, A circulation pump (8) is fixedly installed on the outside of the test chamber (1). A water inlet pipe (9) is fixedly installed at the inlet of the circulation pump (8). One end of the water inlet pipe (9) passes through the test chamber (1) and the water collection tank (5) and extends into the interior of the water collection tank (5).

6. The EL-NSM modified soil wet-dry cycle test equipment according to claim 5, characterized in that, The outlet of the circulating pump (8) is fixedly connected to a U-shaped pipe (10). Both ends of the U-shaped pipe (10) extend into the interior of the test chamber (1). Multiple spray heads (11) are fixedly installed at the bottom of the U-shaped pipe (10) and inside the test chamber (1). The U-shaped pipe (10) and the spray heads (11) are located above the support plate (2).

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