A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials

Abstract

This invention discloses a semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials, comprising: a frame; a liquid supply tank fixed to the frame, the liquid supply tank having multiple lifting baffles that divide the interior of the liquid supply tank into multiple liquid supply chambers, each liquid supply chamber being connected to an outlet pipe, and each outlet pipe being equipped with a switch valve; a spray hood communicating with the outlet pipe, with multiple spray heads mounted on the bottom surface of the spray hood; multiple soil sample leaching cylinders mounted on the frame, their upper openings located below the multiple spray hoods, the multiple spray heads uniformly spraying filtrate onto the soil samples inside the soil sample leaching cylinders; multiple filtrate control valves mounted on the frame, their upper valve ports respectively connected to the lower openings of the multiple soil sample leaching cylinders; and multiple transparent filtrate collection tanks, each connected to the lower valve port of the multiple filtrate control valves. This device can effectively simulate acid rain erosion of soft soil roadbed and pavement materials, achieving flexible and efficient leaching tests.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and more particularly to a semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials. Background Art

[0002] Soft soil is widely distributed in my country, mainly in coastal areas, plains, inland lake basins, depressions and river banks. Soft soil in coastal and plain areas is mostly located in deltas or alluvial plains where large rivers flow into the sea, such as Changting, the Pearl River Delta, Tanggu, and the Minjiang River estuary plains; inland lake basins and depressions are represented by Dongting Lake, Hongze Lake, Jiuhu Lake, Dianchi Lake, etc.; soft soil is also often distributed in mountain basins and floodplains, terraces, abandoned river channels, etc. on both sides of the middle and lower reaches of rivers. Soft soil often brings harm in engineering construction due to its high water content, low strength, and poor shear strength. Replacing soft soil with soil with good engineering properties can certainly deal with engineering problems caused by soft soil, but its economic benefits are relatively low. In addition, my country is one of the three major acid rain areas in the world, and the area south of the Yangtze River has become the global acid rain center. Environmental influences such as rainfall may cause the strength of soft soil roadbed and pavement to decrease, affecting the durability of soft soil roadbed and pavement, and thus causing serious impact on engineering safety. However, there has been a lack of research on the long-term stability of soft soil roadbeds and pavements after acid rain erosion. Therefore, it is very important to study the leaching characteristics of soft soil roadbeds and pavements after acid rain erosion.

[0003] At present, the commonly used method for simulating acid rain erosion is the semi-dynamic leaching test. Semi-dynamic leaching is a method used to evaluate the erosion of heavy metal-contaminated solidified soil or building substrates under the action of acidic solutions, salt solutions, etc. or the potential for releasing pollutants. It combines the characteristics of dynamic leaching and static leaching. During the experiment, the leaching liquid is regularly updated or replaced according to the set time interval to simulate the interaction between the roadbed material and the leaching liquid in the real environment. At present, the conventional practice of conducting leaching tests in the experiment mainly uses beakers and permeable stones, which are completed by constantly replacing beakers and leaching liquids, and there is a lack of special instruments and equipment for this experiment. In addition, since the leaching liquid used in the experiment is corrosive to a certain extent, the filtrate usually contains a large amount of heavy metals and other harmful substances. The current test device has the problem of inevitable contact with the solution or splashing of the solution during the collection of the filtrate or replacement of the leaching liquid, which causes certain harm to the human body.

[0004] Therefore, in view of the lack of safety of current experimental equipment, the present invention aims to provide a semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials, which can avoid direct contact with the leaching liquid during the entire experimental process and effectively prevent the splashing of the filtrate. Summary of the invention

[0005] In view of this, the present invention provides a semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials, which can avoid direct contact with leaching liquid during the entire experimental process and effectively prevent splashing of filtrate.

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

[0007] A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials, comprising:

[0008] Frame;

[0009] A liquid supply box, the liquid supply box is fixed on the top of the frame, a plurality of lifting baffles are installed inside the liquid supply box at intervals, the plurality of lifting baffles divide the internal space of the liquid supply box into a plurality of liquid supply chambers, each of the liquid supply chambers is connected to a liquid outlet pipe, and a switch valve is installed on the liquid outlet pipe;

[0010] A spray hood, wherein the internal space of the spray hood is a liquid storage cavity, the liquid storage cavity is connected and communicated with the liquid outlet pipe, and a plurality of spray heads are installed on the bottom end surface of the spray hood and are all communicated with the liquid storage cavity;

[0011] A soil sample leaching filter cylinder, wherein the soil sample leaching filter cylinder is installed on the frame at intervals, the upper tube openings of the soil sample leaching filter cylinders are respectively located below the spray covers, and the spray heads spray filtrate uniformly to the soil sample in the soil sample leaching filter cylinder;

[0012] A filtrate control valve, wherein the filtrate control valve is installed on the frame at intervals, and the upper valve ports of the plurality of filtrate control valves are respectively connected to the lower cylinder ports of the plurality of soil sample leaching cylinders;

[0013] A transparent filtrate collecting box, wherein the number of the transparent filtrate collecting boxes is multiple and each of the transparent filtrate collecting boxes is connected to the lower valve ports of the multiple filtrate control valves respectively.

[0014] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials. The device can adjust the position and number of the lifting baffles used in the test according to different experimental requirements, and can study the influence of different leaching liquids on the leaching characteristics of the same soil sample, or lift all the lifting baffles to make the liquid supply chambers interconnected, and conduct leaching experiments of different soil samples with the same leaching liquid. Such a design can realize multiple groups of tests at the same time, with flexible operation and improved efficiency. Specifically, take three lifting baffles to divide the liquid supply box into four liquid supply chambers as an example for explanation:

[0015] Simulate the erosion effect of different leachates on the same soil sample: divide the soil to be tested into four equal parts, and prepare soil samples of exactly the same size according to the same standard and place them in four soil sample leaching cylinders. Lower all three lifting baffles in the liquid supply box, divide the liquid supply box into four liquid supply chambers, each of which is used to store a specific leachate (such as sulfuric acid solutions with pH values ​​of 2, 4, 8, and 12, respectively), and inject the corresponding leachate into each liquid supply chamber of the liquid supply box. At the beginning of the test, open the switch valve to allow the leaching liquid to evenly and densely infiltrate the soil samples in the corresponding soil sample leaching cylinders through the sprinkler heads. When the test soil samples are completely immersed in the leaching liquid, close the switch valve. After the soil samples are in contact with the leaching liquid for the specified time of the semi-dynamic leaching test, the filtrate in the soil sample leaching cylinder is allowed to flow into the transparent filtrate collection box through the filtrate control valve. In this process, the contact time between the leaching liquid and each soil sample is controlled to remain consistent, the filtrate after leaching is collected, and the influence of each leaching liquid on the soil sample is recorded, so as to explore and evaluate the erosion effect of different leaching liquids on the soil sample.

[0016] It can also simulate the erosion of different soils by the same leachate. Pull up all three lifting baffles inside the liquid supply box to make all four liquid supply chambers connected, and put a leachate simulating acid rain (such as a sulfuric acid solution of a certain concentration) into the liquid supply chamber. Prepare four different types of test soils (such as soils solidified with four different curing agents) into samples of exactly the same size according to the same standard, open the switch valve, and let the leachate pass through the sprinkler head to evenly and finely infiltrate the soil samples in the corresponding soil sample leaching cylinders. When the test soil samples are completely immersed in the leachate, close the switch valve, and wait until the soil samples are in contact with the leachate for the specified time of the semi-dynamic leaching test through the filtrate control valve. The filtrate from the soil sample leaching cylinder flows into a transparent filtrate collection box. During this process, the contact time between the leaching liquid and each soil sample is controlled to remain consistent, so as to explore and evaluate the erosion effect of the same leaching liquid on different solidified soil samples. After the experiment, the filtrate from the soil sample leaching cylinder flows into the transparent filtrate collection box through the filtrate control valve, and the filtrate of each soil sample is collected and analyzed. The erosion effect of the same leaching liquid on different solidified soil samples is recorded in detail, and the erosion effect of the same leaching liquid on different soil bodies is systematically evaluated and compared, thereby providing strong data support for the durability and stability research of solidified soil bodies used as roadbed materials.

[0017] Therefore, the present invention can effectively simulate the acid rain erosion of soft soil roadbed and pavement materials by arranging multiple liquid supply chambers, multiple soil sample leaching cylinders, multiple filtrate control valves, and multiple transparent filtrate collection boxes, thereby realizing multiple groups of flexible and efficient leaching tests; and, the leaching liquid can be evenly sprayed to wet the soil sample through the sprinkler head, which can better simulate the effect of acid rain erosion and improve the problem that the solution of the outlet pipe cannot evenly cover the soil sample during leaching; in addition, it can be conveniently observed from the transparent filtrate collection box whether the filtrate in the soil sample leaching cylinder has flowed out completely, and in the entire semi-dynamic leaching process, the filtrate control valve is always tightly connected with the transparent filtrate collection box, which effectively ensures the smooth inflow of the filtrate, prevents the risk of the filtrate splashing or leaking to the outside of the transparent filtrate collection box during the experiment, and ensures the safety of the experiment.

[0018] Furthermore, a plurality of support cylinder seats are fixed at intervals on the frame, a first semicircular baffle is fixed on one side of the inner wall of the support cylinder seat, a gap between the other side of the inner wall of the support cylinder seat and the first semicircular baffle is a filtrate outflow hole, and the lower cylinder mouth of the soil sample leaching cylinder is overlapped on the first semicircular baffle;

[0019] The filtrate control valve comprises:

[0020] A valve cylinder, wherein the top outer wall of the valve cylinder is threadedly connected to the inner wall of the support cylinder seat, and the bottom of the valve cylinder is threadedly connected to the transparent filtrate collection box;

[0021] A second semicircular baffle is fixed at the upper cylinder mouth of the valve cylinder body and forms a semicircular hole at the upper cylinder mouth of the valve cylinder body. The upper cylinder mouth of the valve cylinder body is connected with the lower cylinder mouth of the soil sample leaching cylinder. Rotating the valve cylinder body can make the second semicircular baffle cover the filtrate outflow hole and make the semicircular hole connect to the filtrate outflow hole.

[0022] The beneficial effect of adopting the above technical scheme is: before the semi-dynamic leaching test begins, the valve cylinder is tightened upward to the top, at which time the second semicircular baffle on the valve cylinder just blocks the filtrate outflow hole, and the leaching liquid is controlled not to flow out of the soil sample leaching cylinder, thereby ensuring that the leaching liquid fully soaks the tested soil sample; afterward, the valve cylinder is rotated downward so that the second semicircular baffle on the valve cylinder no longer blocks the filtrate outflow hole, at which time the leaching liquid of the soil sample leaching cylinder flows directly to the transparent filtrate collection box through the filtrate outflow hole for collection, and in this process, because the transparent filtrate collection box is always connected to the valve cylinder as a whole, there will be no problem of leaching liquid splashing and injuring people, and after the collection is completed, the transparent filtrate collection box is unscrewed from the valve cylinder, and the filtrate of the soil sample can be analyzed, and the operation is extremely convenient and safe.

[0023] Furthermore, a sealing rubber ring is sleeved on the outer wall of the valve cylinder body for sealingly contacting the inner wall of the support cylinder seat.

[0024] The beneficial effects of adopting the above technical solution are: avoiding the danger of leakage of filtrate, and the sealing rubber ring can also increase the tightening force between the valve cylinder and the support cylinder seat, making the installation of the valve cylinder and the support cylinder seat more sealed and firm.

[0025] Furthermore, the soil sample leaching cylinder comprises: a first semicircular cylinder and a second semicircular cylinder that are interlocked, and the first semicircular cylinder and the second semicircular cylinder are both detachably connected to the supporting cylinder seat.

[0026] The beneficial effect of adopting the above technical solution is that after the test is completed, the soil sample can be demoulded from the soil sample leaching cylinder, that is, the leached soil sample can be taken out by opening the first semicircular cylinder and the second semicircular cylinder, and the operation is extremely convenient.

[0027] Furthermore, the first semicircular cylinder and the second semicircular cylinder are fastened and connected via a mortise and tenon structure.

[0028] The beneficial effects of adopting the above technical solution are: the first semicircular cylinder and the second semicircular cylinder are easy to quickly disassemble and assemble, and the operation is convenient.

[0029] Furthermore, the first semicircular cylinder and the second semicircular cylinder are connected by connecting bolts.

[0030] The beneficial effect of adopting the above technical solution is: the fastening stability of the first semicircular cylinder and the second semicircular cylinder is improved by connecting the bolts, so as to avoid the problem of test failure and splashing of leachate and injuring people caused by loosening and separation of the two during the test.

[0031] Furthermore, first half rings are fixed to both side outer walls of the first semicircular cylinder, and second half rings are fixed to both side outer walls of the second semicircular cylinder. The first half ring and the second half ring are butted together to form a buckle, and the connecting bolt passes through the buckle and is fixed by a locking nut.

[0032] The beneficial effect of adopting the above technical solution is that when the first semicircular cylinder and the second semicircular cylinder are buckled together, the first half ring and the second half ring are also buckled together to form a ring mouth. At this time, they can be locked and fixed using connecting bolts and locking nuts.

[0033] Furthermore, two clamping fixing columns are fixed at intervals on the support cylinder seat, and fixing ear plates are fixed on the outer walls of the first semicircular cylinder and the second semicircular cylinder. The fixing ear plates are provided with clamping notches, and the clamping fixing columns are clamped on the clamping notches.

[0034] The beneficial effect of adopting the above technical solution is that the soil sample leaching cylinder and the supporting cylinder seat can be quickly disassembled and assembled.

[0035] Furthermore, two clamping nuts are threadedly connected to the clamping fixing column, and the two clamping nuts are respectively pressed on the top end surface and the bottom end surface of the fixing ear plate.

[0036] The beneficial effect of adopting the above technical solution is to improve the installation stability of the soil sample leaching cylinder and the supporting cylinder seat.

[0037] Furthermore, the liquid supply box is provided with a cover plate for covering the liquid supply cavity, and the cover plate is provided with a handle.

[0038] The beneficial effect of adopting the above technical solution is that the leaching liquid can be added or replaced to the corresponding liquid supply cavity by lifting the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0040] Figure 1 A schematic structural diagram of a semi-dynamic leaching device provided by the present invention for simulating acid rain erosion of roadbed and pavement materials.

[0041] Figure 2 It is a schematic diagram of the structure of the first semicircular cylinder.

[0042] Figure 3 Schematic diagram of the soil sample leaching cylinder.

[0043] Figure 4 Schematic diagram of the filtrate control valve. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0045] like Figure 1-Figure 4 As shown, the embodiment of the present invention discloses a semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials, comprising:

[0046] Frame 1;

[0047] A liquid supply box 2 is fixed on the top of the frame 1. A plurality of lifting partitions 3 are installed at intervals inside the liquid supply box 2. Specifically, the two sides of the lifting partitions 3 can be slidably inserted into the longitudinal grooves (not marked) on the two opposite inner walls of the liquid supply box 2. The plurality of lifting partitions 3 divide the internal space of the liquid supply box 2 into a plurality of liquid supply chambers 201. The liquid supply box 2 is provided with a cover plate 21 for covering the liquid supply chamber 201. The cover plate 21 is provided with a handle 22. Each liquid supply chamber 201 is connected to a liquid outlet pipe 4. A switch valve 5 is installed on the liquid outlet pipe 4. On the one hand, the speed of the leaching liquid entering the soil sample leaching cylinder can be conveniently controlled by the switch valve 5. On the other hand, the number of soil samples participating in the leaching test can be controlled by the switch valve 5.

[0048] A spray hood 6, wherein the internal space of the spray hood 6 is a liquid storage cavity 601, the liquid storage cavity 601 is connected and communicated with the liquid outlet pipe 4, and a plurality of spray heads 7 are installed on the bottom end surface of the spray hood 6 and are all communicated with the liquid storage cavity 601;

[0049] A soil sample leaching cylinder 8, which is a plurality of soil sample leaching cylinders 8 installed at intervals on the frame 1, wherein the upper cylinder openings of the plurality of soil sample leaching cylinders 8 are respectively located below the plurality of spray covers 6, and the plurality of spray heads 7 spray the filtrate uniformly to the soil sample in the soil sample leaching cylinder 8, so that the solution can uniformly cover the soil sample during leaching, thereby ensuring uniform leaching and infiltration of the soil sample, and better simulating the effect of acid rain eroding the soil sample;

[0050] A filtrate control valve 9, wherein the filtrate control valve 9 is installed on the frame 1 at intervals, and the upper valve ports of the plurality of filtrate control valves 9 are respectively connected to the lower cylinder ports of the plurality of soil sample leaching cylinders 8;

[0051] The transparent filtrate collecting box 10 is multiple and is connected to the lower valve ports of the multiple filtrate control valves 9 respectively.

[0052] In the embodiment, a plurality of support cylinder seats 11 are fixed at intervals on the frame 1, a first semicircular baffle plate 12 is fixed on one side of the inner wall of the support cylinder seat 11, a gap between the other side of the inner wall of the support cylinder seat 11 and the first semicircular baffle plate 12 is a filtrate outflow hole 13, and the lower cylinder mouth of the soil sample leaching cylinder 8 is overlapped on the first semicircular baffle plate 12;

[0053] The filtrate control valve 9 comprises:

[0054] The valve cylinder 91, the top outer wall of the valve cylinder 91 is threadedly connected to the inner wall of the support cylinder seat 11, and the bottom of the valve cylinder 91 is threadedly connected to the transparent filtrate collection box 10;

[0055] The second semicircular baffle 92 is fixed at the upper mouth of the valve cylinder 91 and forms a semicircular hole 93 at the upper mouth of the valve cylinder 91. The upper mouth of the valve cylinder 91 is connected to the lower mouth of the soil sample leaching cylinder 8. Rotating the valve cylinder 91 can make the second semicircular baffle 92 cover the filtrate outflow hole 13 and make the semicircular hole 93 connect to the filtrate outflow hole 13.

[0056] In order to prevent the filtrate from leaking out from the gap between the valve cylinder 91 and the inner wall of the support cylinder seat 11 when the valve cylinder 91 is rotated, a sealing rubber ring 14 is provided on the outer wall of the valve cylinder 91 for sealing contact with the inner wall of the support cylinder seat 11. This can increase the sealing between the valve cylinder 91 and the support cylinder seat 11 when the valve cylinder 91 is rotated, thereby preventing the filtrate from leaking.

[0057] In some embodiments, in order to facilitate the rapid removal of the leached soil sample from the soil sample leaching cylinder, the soil sample leaching cylinder 8 includes: a first semicircular cylinder 81 and a second semicircular cylinder 82 that are interlocked, and the first semicircular cylinder 81 and the second semicircular cylinder 82 are both detachably connected to the support cylinder seat 11, so that opening the first semicircular cylinder 81 and the second semicircular cylinder 82 can facilitate the demolding and removal of the soil sample.

[0058] Of course, when the valve cylinder 91 is screwed upward to make its upper cylinder mouth dock with the lower cylinder mouth of the soil sample leaching cylinder 8, in order to ensure the sealing of the two, a sealing ring can be crimped between the two. Specifically, the sealing ring can be set on the lower cylinder mouth of the soil sample leaching cylinder 8, and a mounting groove (such as Figure 2 (see dotted line portion in the figure) and install a sealing ring (not shown) in the installation groove.

[0059] In the above-mentioned snap-fit ​​connection structure, the first semicircular cylinder 81 and the second semicircular cylinder 82 can be snap-fitted and connected by a mortise and tenon structure 83. For example, the first semicircular cylinder 81 and the second semicircular cylinder 82 are respectively provided with a mortise and tenon on both sides. When the two are snapped together, the tenon and the mortise and tenon are plugged into each other.

[0060] Of course, in order to improve the sealing performance of the first semicircular cylinder 81 and the second semicircular cylinder 82, a sealing ring can be crimped at the joint between the two to prevent the internal filtrate from leaking out.

[0061] In order to further improve the stability of the first semicircular cylinder 81 and the second semicircular cylinder 82 after being buckled, so that the two are not easy to separate, the first semicircular cylinder 81 and the second semicircular cylinder 82 of the present invention can be further connected and fixed by connecting bolts 84. Among them, the first semicircular cylinder 81 is fixed with a first half ring 811 on both sides of the outer wall, and the second semicircular cylinder 82 is fixed with a second half ring 821 on both sides of the outer wall. The first half ring 811 and the second half ring 821 are connected to form a ring buckle 85, and the connecting bolt 84 passes through the ring buckle 85 and is fixed by a locking nut 86, so that the first semicircular cylinder 81 and the second semicircular cylinder 82 are always kept closed during the leaching process.

[0062] In order to realize simple and easy disassembly and assembly of the soil sample leaching cylinder 8 and the support cylinder seat 11, two clamping fixing columns 15 are fixed on the support cylinder seat 11 at intervals, and fixing ear plates 16 are fixed on the outer walls of the first semicircular cylinder 81 and the second semicircular cylinder 82. The fixing ear plates 16 are provided with clamping notches 161, and the clamping fixing columns 15 are clamped on the clamping notches 161.

[0063] In order to further improve the connection stability between the soil sample leaching cylinder 8 and the support cylinder seat 11, two clamping nuts 17 are screwed on the clamping fixing column 15, and the two clamping nuts 17 are respectively pressed on the top end surface and the bottom end surface of the fixing ear plate 16.

[0064] When the present invention is used, the number of soil samples to be leached is determined according to the test requirements. This embodiment uses the simulation of the erosion of different soil bodies by the same leaching liquid as an example for explanation. The three lifting partitions inside the liquid supply box are all pulled upwards to connect all four liquid supply chambers, and a leaching liquid simulating acid rain (such as a sulfuric acid solution of a certain concentration) is loaded into the liquid supply chamber. Four different types of test soil bodies (such as soil bodies solidified with four different curing agents) are prepared into samples of exactly the same size according to the same standard, and are placed in four soil sample leaching cylinders. The four soil sample leaching cylinders are installed on the support cylinder seat, and then the valve cylinder is tightened upward to the top. At this time, the second semicircular baffle on the valve cylinder just blocks the filtrate outflow hole, and the leaching liquid is controlled not to flow out of the soil sample leaching cylinder, ensuring that the leaching liquid fully soaks the tested soil sample. Then, the switch valve is opened to allow the leaching liquid to penetrate the test soil sample evenly and densely through the spray head. The soil samples in the corresponding soil sample leaching cylinders are moistened. During this process, the contact time between the leaching liquid and each soil sample is controlled to be consistent, so as to explore and evaluate the erosion effect of the same leaching liquid on different solidified soil samples. When the leaching liquid has been in contact with the tested soil sample for a certain time interval, the experiment is over, and the valve cylinder is rotated downward to align the semicircular holes on it with the filtrate outflow hole, so that the leaching liquid in the soil sample leaching cylinder can flow out into the transparent filtrate collection box, and the filtrate of each soil sample is collected and analyzed, and the erosion effect of the same leaching liquid on different solidified soil samples is recorded in detail, and the erosion effect of the same leaching liquid on different soil bodies is systematically evaluated and compared, thereby providing strong data support for the durability and stability research of solidified soil bodies used as roadbed materials.

[0065] The advantages of the present invention are as follows:

[0066] 1. The present invention can effectively simulate the acid rain erosion of soft soil roadbed and pavement materials by arranging multiple liquid supply chambers, multiple soil sample leaching cylinders, multiple filtrate control valves, and multiple transparent filtrate collection boxes, thereby realizing multiple groups of flexible and efficient leaching tests.

[0067] 2. The sprinkler head can evenly spray the leaching liquid to wet the soil sample, which can better simulate the effect of acid rain erosion and improve the problem that the solution in the outlet pipe cannot evenly cover the soil sample during leaching.

[0068] 3. From the transparent filtrate collection box, it is convenient to observe whether the filtrate in the soil sample leaching cylinder has completely flowed out. Moreover, during the entire semi-dynamic leaching process, the filtrate control valve is always tightly connected to the transparent filtrate collection box, which effectively ensures the smooth flow of the filtrate and prevents the risk of filtrate splashing or leaking to the outside of the transparent filtrate collection box during the experiment, thus ensuring the safety of the experiment.

[0069] 4. The first semicircular cylinder and the second semicircular cylinder are interlocked to form a soil sample leaching cylinder, which is convenient for demoulding and removing the soil sample.

[0070] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0071] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials, characterized in that: include: Frame (1); A liquid supply box (2), the liquid supply box (2) being fixed on the top of the frame (1), the liquid supply box (2) being internally provided with a plurality of lifting baffles (3) at intervals, the plurality of lifting baffles (3) dividing the internal space of the liquid supply box (2) into a plurality of liquid supply chambers (201), each of the liquid supply chambers (201) being connected to a liquid outlet pipe (4), and each of the liquid outlet pipes (4) being provided with a switch valve (5); A spray hood (6), wherein the internal space of the spray hood (6) is a liquid storage cavity (601), the liquid storage cavity (601) is connected to and communicated with the liquid outlet pipe (4), and a plurality of spray heads (7) are installed on the bottom end surface of the spray hood (6) and are all communicated with the liquid storage cavity (601); A soil sample leaching cylinder (8), wherein the soil sample leaching cylinder (8) is installed on the frame (1) at intervals, the upper cylinder openings of the plurality of soil sample leaching cylinders (8) are respectively located below the plurality of spray covers (6), and the plurality of spray heads (7) spray filtrate uniformly onto the soil sample in the soil sample leaching cylinder (8); A filtrate control valve (9), wherein the filtrate control valve (9) is installed in a plurality of intervals on the frame (1), and the upper valve ports of the plurality of filtrate control valves (9) are respectively connected to the lower cylinder ports of the plurality of soil sample leaching cylinders (8); A transparent filtrate collecting box (10), wherein the transparent filtrate collecting box (10) is multiple and is respectively connected to the lower valve ports of the multiple filtrate control valves (9); A plurality of support cylinder seats (11) are fixed at intervals on the frame (1); a first semicircular baffle plate (12) is fixed to one side of the inner wall of the support cylinder seat (11); a gap between the other side of the inner wall of the support cylinder seat (11) and the first semicircular baffle plate (12) is a filtrate outflow hole (13); and a lower cylinder mouth of the soil sample leaching cylinder (8) is overlapped on the first semicircular baffle plate (12); The filtrate control valve (9) comprises: A valve cylinder (91), wherein the top outer wall of the valve cylinder (91) is threadedly connected to the inner wall of the support cylinder seat (11), and the bottom of the valve cylinder (91) is threadedly connected to the transparent filtrate collection box (10); A second semicircular baffle (92), the second semicircular baffle (92) being fixed at the upper cylinder mouth of the valve cylinder (91), and forming a semicircular hole (93) at the upper cylinder mouth of the valve cylinder (91), the upper cylinder mouth of the valve cylinder (91) being butted against the lower cylinder mouth of the soil sample leaching cylinder (8), and the valve cylinder (91) being rotated so that the second semicircular baffle (92) can cover the filtrate outflow hole (13) and the semicircular hole (93) can be connected to the filtrate outflow hole (13); The soil sample leaching cylinder (8) comprises: a first semicircular cylinder (81) and a second semicircular cylinder (82) which are interlocked, and the first semicircular cylinder (81) and the second semicircular cylinder (82) are both detachably connected to the supporting cylinder seat (11); Two clamping fixing columns (15) are fixed at intervals on the support cylinder seat (11); fixing ear plates (16) are fixed on the outer walls of the first semicircular cylinder (81) and the second semicircular cylinder (82); the fixing ear plates (16) are provided with clamping notches (161); and the clamping fixing columns (15) are clamped on the clamping notches (161).

2. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials according to claim 1, characterized in that: A sealing rubber ring (14) is sleeved on the outer wall of the valve cylinder (91) for sealingly contacting the inner wall of the support cylinder seat (11).

3. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials according to claim 1, characterized in that: The first semicircular cylinder (81) and the second semicircular cylinder (82) are connected by means of a mortise and tenon structure (83).

4. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials according to claim 3, characterized in that: The first semicircular cylinder (81) and the second semicircular cylinder (82) are connected by connecting bolts (84).

5. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials according to claim 4, characterized in that: First half rings (811) are fixed to both side outer walls of the first semicircular cylinder (81), and second half rings (821) are fixed to both side outer walls of the second semicircular cylinder (82). The first half ring (811) and the second half ring (821) are butt-jointed to form a ring buckle (85), and the connecting bolt (84) passes through the ring buckle (85) and is fixed by a locking nut (86).

6. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials according to claim 1, characterized in that: Two clamping nuts (17) are threadedly connected to the clamping fixing column (15), and the two clamping nuts (17) are respectively pressed on the top end surface and the bottom end surface of the fixing ear plate (16).

7. A semi-dynamic leaching device for simulating acid rain erosion of roadbed and pavement materials according to any one of claims 1 to 6, characterized in that: The liquid supply box (2) is provided with a cover plate (21) for covering the liquid supply cavity (201), and the cover plate (21) is provided with a handle (22).

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