A method for measuring the corrosion rate of carbonate rock

Abstract

The present invention provides a method for measuring the corrosion rate of carbonate rock, and the steps include: drilling a test hole at the test site, opening a horizontally arranged strip-shaped slot on the side wall of the test hole, horizontally inserting corrosion test pieces into the strip-shaped slot respectively, backfilling the test hole with the original soil, performing karst erosion according to a set time, after the karst erosion is completed, taking out the corrosion test pieces, and calculating the daily average corrosion rate of the corrosion test pieces. The present invention not only realizes that there is no need for an operator to enter the pit to bury and take out the corrosion test pieces, but also significantly improves the measurement efficiency of the corrosion rate and the accuracy of the measurement results. More importantly, it greatly reduces the operation difficulty of burying and taking out the corrosion test pieces.

Description

Technical Field

[0001] The present invention belongs to the technical field of karst carbon sinks, and particularly relates to a method for measuring the corrosion rate of carbonate rocks. Background Art

[0002] In the process of carbon sink research, soil carbon sink, vegetation carbon sink and karst carbon sink are involved. In karst carbon sink, the karst carbon sink intensity of a designated area can be calculated by the GEM-CO2 model, and its accuracy can be verified by the standard corrosion test piece method. At present, to calculate the karst carbon sink intensity by the standard corrosion test piece method, it is first necessary to calculate the corrosion rate, then calculate the karst carbon sink intensity through the corrosion rate, and finally compare the data obtained with the GEM-CO2 model to verify the accuracy of the model.

[0003] The corrosion test piece is a key tool in the process of measuring the corrosion rate. Generally, it is a cake made of limestone, which is mainly used to collect karst characteristic information collected in the rock and soil. After the collection time ends, the corrosion test piece is taken out and its corrosion rate is measured. At present, the main method for measuring the corrosion rate using the corrosion test piece is as follows: first, select the test site, then dig a hole at the test site, then the operator enters the hole to insert the corrosion test piece into the soil layer at the target depth, and then backfill the soil layer. After the sampling time ends, the operator digs a hole again to take out the corrosion test piece, and finally calculates the corrosion rate according to the calculation formula in the corresponding standard. However, the main disadvantages of this method include: low efficiency. For a single measurement area, the process of simply digging a hole and inserting the corrosion test piece alone takes about three hours, and the process of digging a hole again to take out the corrosion test piece for a single measurement area takes half a day to a day. The operation difficulty is high. More importantly, the process of digging a hole again to take out the corrosion test piece is relatively cumbersome and requires great care, otherwise it is easy to damage the corrosion test piece, thereby affecting the accuracy of the measurement result.

[0004] In order to reduce the operation steps of burying the corrosion test piece, the existing document CN218674434U discloses a device for burying the corrosion test piece, including a column, a shell, a push rod, a push plate and an elastic long steel sheet, the lower end surface of the shell is provided with a through groove extending in the direction of the column, the push plate is arranged in the through groove, one end of the push rod is connected to the push plate, and the other end extends out of the shell from the column direction, the shell is also provided with a U-shaped channel, and one end of the steel sheet is inserted into the U-shaped channel. When burying the corrosion test piece, the corrosion test piece is placed in the through groove, one end of the steel sheet is inserted from the opening of the U-shaped channel to the end of the U-shaped channel, and then the shell is hammered into the corresponding depth from the side wall of the pit, one end of the steel sheet is pulled, and the steel sheet is extracted from the U-shaped channel, the corrosion test piece is resisted by the push rod and the push plate, and the shell is extracted from the side wall of the pit at the same time, and the corrosion test piece is left in the hole punched out of the side wall, and finally the hole is backfilled. However, this solution does not solve the problem that the process of re-digging a pit to remove the dissolution test piece is cumbersome, difficult to operate and inefficient, and requires operators to enter a pre-dug pit, which must also meet the requirements for operator entry. In essence, it does not solve the technical problem of low efficiency in dissolution rate measurement. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a method for measuring the dissolution rate of carbonate rock. The method at least eliminates the need for operators to enter the pit to bury and remove the dissolution test pieces, thereby significantly improving the efficiency of dissolution rate measurement.

[0006] The present invention adopts the following technical solution.

[0007] A method for measuring carbonate rock dissolution rate, comprising the following steps:

[0008] Step 1, select the test location;

[0009] Step 2: Drill a test hole at the test site, the depth of the test hole should not be less than 50 cm;

[0010] Step 3, opening a transversely arranged strip slit on the side wall of the test hole;

[0011] Step 4, inserting the dissolution test pieces into the strip-shaped seams horizontally, wherein the height of the strip-shaped seams is 1-3 mm greater than the thickness of the dissolution test pieces;

[0012] Step 5, backfill the test hole with original soil and perform karst erosion according to the set time;

[0013] Step 6, after the karst erosion is completed, take out the erosion test piece;

[0014] Step 7, calculate the average daily dissolution rate of the dissolution test piece.

[0015] To improve the measurement efficiency of the dissolution rate and the accuracy of the measurement results, in step 2, a drilling machine is used to drill test holes, and the diameter of the test holes is controlled to be 10 - 20 cm.

[0016] To further improve the measurement efficiency of the dissolution rate, in step 3, a sawing tool is used to create strip-shaped slots. The sawing tool includes a motor, the output end of the motor is connected to a rotating shaft, the bottom end of the rotating shaft is movably connected to a support plate, and at least four groups of circular saw blades are arranged at intervals on the rotating shaft. The distances of four of the groups of circular saw blades from the top reference point are 10 cm, 20 cm, 40 cm, and 50 cm respectively.

[0017] For more convenient operation, the support plate is a circular plate, a dovetail groove is radially arranged on the support plate, the bottom end of the rotating shaft is inserted into the dovetail groove, and the rotating shaft can only move horizontally along the dovetail groove.

[0018] To further improve the measurement efficiency of the dissolution rate, the dissolution test pieces are respectively inserted horizontally into the strip-shaped slots with the aid of a cylindrical tool. The cylindrical tool includes a cylinder with a closed bottom end and an open top end. At least four arc-shaped holes are arranged on the side wall of the cylinder. The four arc-shaped holes correspond one-to-one with four of the groups of circular saw blades in the height direction. The height of each arc-shaped hole is greater than the thickness of the dissolution test piece. It also includes a rod that can be inserted into the cylinder, and four wire ropes arranged on the rod are respectively connected to the corresponding dissolution test pieces.

[0019] To be able to insert the dissolution test pieces into the target measurement position more smoothly, a rod is radially arranged on the dissolution test piece, the length of the rod is greater than the maximum wall thickness of the cylinder, and the four wire ropes are respectively connected to the rods on the corresponding dissolution test pieces. To be able to insert the dissolution test pieces into the target measurement position more smoothly and quickly, a planar structure is arranged on the rod near the side of the dissolution test piece.

[0020] As a preferred solution, the arc-shaped holes are located at the maximum wall thickness part of the cylinder, and the thickness of the maximum wall thickness part of the cylinder is 1 / 3 - 1 / 2 of the diameter of the dissolution test piece.

[0021] As a preferred solution, in step 4, the specific steps of inserting the dissolution test pieces horizontally into the strip-shaped slots are as follows: first, insert the cylindrical tool into the test hole so that the four arc-shaped holes are respectively aligned with the four strip-shaped slots, and then use the rod to horizontally impact the rod until the outer end of the rod is flush or substantially flush with the inner wall of the cylinder.

[0022] To further improve the measurement efficiency of the dissolution rate, the steps of backfilling the test hole with the original soil in step 5 include: first, place the rod against the rod and keep it vertical, then insert an oval rod outside the rod and against the rod, then pour the original soil into the test hole and compact it, and cover the cylindrical tool with the original soil.

[0023] In order to smoothly and quickly remove the corrosion test piece from the target measurement position, the specific steps for removing the corrosion test piece in step 6 include: first, extract the elliptical rod, and then horizontally pull the rod body outward until the corrosion test piece is horizontally drawn into the cylinder and then lift the rod body.

[0024] Beneficial effects: By adopting the solution in the present invention, it is not only possible to avoid the operator entering the pit for burying and removing the corrosion test piece, but also significantly improve the determination efficiency of the corrosion rate and the accuracy of the determination result. More importantly, the operation difficulty of burying and removing the corrosion test piece is greatly reduced; for the process of digging a pit and inserting the corrosion test piece in a single measurement area, it only takes about nine minutes, and for the process of re-digging a pit to remove the corrosion test piece in a single measurement area, it takes about four minutes, and the process of removing the corrosion test piece is simpler and almost does not damage the corrosion test piece; by adopting the solution in the present invention, the test sampling location is almost not limited by the type of terrain, and it is not only applicable to sampling for corrosion rate determination in areas with high humidity, but also applicable to sampling for corrosion rate determination in areas with less rainfall. Even in sandy soil areas, sampling can be carried out smoothly. Description of the Drawings

[0025] Figure 1 Schematic diagram of the sawing tool in the embodiment;

[0026] Figure 2 Schematic diagram of the cylindrical tool in the embodiment;

[0027] Figure 3 Schematic diagram of the usage state of the cylindrical tool in the embodiment (before the corrosion test piece 1 is horizontally inserted into the strip-shaped slot 3);

[0028] Figure 4 Schematic diagram of the usage state of the cylindrical tool in the embodiment (after the corrosion test piece 1 is horizontally inserted into the strip-shaped slot 3). Detailed Embodiments

[0029] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0030] Combined with Figure 1 and Figure 2 As shown, a method for determining the corrosion rate of carbonate rock includes the following steps:

[0031] Step 1, select a test location in a certain river valley area, where the water content in the soil at the test location is about 42% and the humidity is high (it is necessary to wear waterproof clothing to operate using the traditional solution);

[0032] Step 2: Drill test holes at the test site using a drilling machine. The diameter of the test holes is controlled at 15 cm, and the depth of the test holes from the reference ground surface is controlled at 60 cm.

[0033] Step 3: Open transverse strip-shaped slots on the side walls of the test holes.

[0034] Specifically: Use a sawing tool to open the strip-shaped slots. The sawing tool includes a motor, the output end of the motor is connected to a rotating shaft 11, the bottom end of the rotating shaft 11 is movably connected to a support plate 13, and four groups of circular saw blades 12 are arranged at intervals on the rotating shaft 11. The distances of the four groups of circular saw blades 12 from the top reference point (reference ground surface) are 10 cm, 20 cm, 40 cm, and 50 cm respectively. Among them, the support plate 13 is a circular plate, a dovetail groove 14 is radially arranged on the support plate 13, the bottom end of the rotating shaft 11 is rotatably connected to a sliding member, the sliding member is fitted in the dovetail groove 14, and under the action of a transverse external force, the rotating shaft 11 can only move horizontally along the dovetail groove 14.

[0035] Step 4: Before burying each corrosion test piece (a total of four corrosion test pieces), wash it with pure water and dry it, weigh it twice and take the average value, and record the initial weight. Horizontally insert the corrosion test piece 1 into the strip-shaped slots respectively. The height of the strip-shaped slots is 1 - 3 mm larger than the thickness of the corrosion test piece, and the depth of the strip-shaped slots is 3 - 5 mm larger than the diameter of the corrosion test piece.

[0036] Use a water pump to pump out the accumulated water in the pit in real time, and then horizontally insert the corrosion test piece 1 into the strip-shaped slots respectively with the help of a cylindrical tool. The cylindrical tool includes a cylinder 20 with a closed bottom and an open top. Four arc-shaped holes 21 are arranged on the side wall of the cylinder 20. The four arc-shaped holes 21 correspond to the four groups of circular saw blades 12 in the height direction. The height of each arc-shaped hole 21 is greater than the thickness of the corrosion test piece 1. It also includes a rod body 22 that can be inserted into the cylinder 20. Four wire ropes 23 arranged on the rod body 22 are respectively connected to the corresponding corrosion test piece 1. A rod body 2 is radially arranged on the corrosion test piece 1. The rod body 2 is a steel needle with a diameter of 2 mm, and the steel needle is bonded in the hole on the edge of the corrosion test piece 1 with strong glue (the same below). The length of the rod body 2 is greater than the maximum wall thickness of the cylinder 20. The four wire ropes 23 are respectively connected to the rod body 2 on the corresponding corrosion test piece 1. The arc-shaped holes 21 are located at the maximum wall thickness part of the cylinder 20, and the thickness of the maximum wall thickness part of the cylinder 20 is 1 / 2 of the diameter of the corrosion test piece 1. In order to insert the corrosion test piece 1 into the target measurement position more smoothly and quickly, a flat structure 24 is arranged on the rod body 22 close to the corrosion test piece 1 in this example. During use, the flat structure 24 is directly used to contact and strike the rod body 2.

[0037] The specific steps for horizontally inserting the corrosion test piece 1 into the strip-shaped slots respectively are: First, insert the cylindrical tool into the test hole so that the four arc-shaped holes 21 are respectively aligned with the four strip-shaped slots (the state at this time is asFigure 3 As shown below), and then use the rod body 22 to horizontally impact the rod body 2 until the outer end of the rod body 2 is flush or substantially flush with the inner wall of the cylinder 20. The state at this time is as shown in Figure 4 shown (the same below);

[0038] Step 5, backfill the test hole with the original soil (the steps include: first place the rod body 22 against the rod body 2 and keep it in a vertical state, then insert an oval rod outside the rod body 22 and against the rod body 22, then pour the original soil into the test hole and compact it, and cover the cylindrical tool with the original soil. The depth of the top of the cylindrical tool from the reference ground is 5 cm), and carry out karst erosion according to the set time (1 year);

[0039] Step 6, after the karst erosion is completed, take out the erosion test piece 1 (the steps include: first pull out the oval rod, and then horizontally pull out the rod body 22 until the erosion test piece 1 is horizontally drawn into the cylinder 20 and then lift the rod body 22);

[0040] Step 7, calculate the daily average erosion rate of the erosion test piece 1,

[0041] Wash the taken-out erosion test piece with pure water, put it in an oven at 105 °C and dry it for 24 h, weigh it again twice and take the average value W2, and the weighing accuracy is 0.01 mg; then calculate the daily average erosion rate using the following formula:

[0042] ER = (W1 - W2) * 10000 / (T * S)

[0043] In the formula, ER is the daily average erosion amount per unit area, that is, the erosion rate (mg·m -2 ·d -1 ), W1 is the initial weight of the erosion test piece (mg), W2 is the weight of the erosion test piece after burial (mg), T is the number of burial days (d), and S is the surface area of the erosion test piece (28.91 cm 2 ).

[0044] Adopting the scheme in this example, the process of digging a hole and inserting the erosion test piece for a single measurement area only takes nine minutes, and the process of re-digging a hole and taking out the erosion test piece for a single measurement area takes even five minutes. Example 2

[0045] Combined with Figure 1 and Figure 2 shown, a method for measuring the karst erosion rate of carbonate rocks, the steps include:

[0046] Step 1, select a test site in a hilly area, and the water content in the soil (hilly yellow soil) of this test site is about 17%;

[0047] Step 2: Drill a test hole at the test site using a drilling machine. The diameter of the test hole is controlled to be 10 cm, and the depth of the test hole from the reference ground surface is controlled to be 60 cm.

[0048] Step 3: Open a horizontally arranged strip-shaped slot on the side wall of the test hole.

[0049] Specifically: Use a sawing tool to open the strip-shaped slot. The sawing tool includes a motor. The output end of the motor is connected to a rotating shaft 11. The bottom end of the rotating shaft 11 is movably connected to a support plate 13. Four groups of circular saw blades 12 are arranged at intervals on the rotating shaft 11. The distances of the four groups of circular saw blades 12 from the top reference point (reference ground surface) are 10 cm, 20 cm, 40 cm, and 50 cm respectively. Among them, the support plate 13 is a circular plate. A dovetail groove 14 is radially arranged on the support plate 13. The bottom end of the rotating shaft 11 is rotatably connected to a sliding member, and the sliding member is fitted in the dovetail groove 14. Under the action of a lateral external force, the rotating shaft 11 can only move horizontally along the dovetail groove 14.

[0050] Step 4: Before burying each corrosion test piece, wash it with pure water and dry it, weigh it twice and take the average value, and record the initial weight. Horizontally insert the corrosion test pieces 1 into the strip-shaped slots respectively. The height of the strip-shaped slot is 1 - 3 mm larger than the thickness of the corrosion test piece, and the depth of the strip-shaped slot is 3 - 5 mm larger than the diameter of the corrosion test piece.

[0051] Horizontally insert the corrosion test pieces 1 into the strip-shaped slots respectively with the aid of a cylindrical tool. The cylindrical tool includes a cylinder 20 with a closed bottom and an open top. Four arc-shaped holes 21 are arranged on the side wall of the cylinder 20. The four arc-shaped holes 21 correspond to the four groups of circular saw blades 12 in the height direction one by one. The height of each arc-shaped hole 21 is larger than the thickness of the corrosion test piece 1. It also includes a rod 22 that can be inserted into the cylinder 20. Four wire ropes 23 arranged on the rod 22 are respectively connected to the corresponding corrosion test pieces 1. A rod 2 is radially arranged on the corrosion test piece 1. The rod 2 is a steel needle with a diameter of 2 mm. The length of the rod 2 is larger than the maximum wall thickness of the cylinder 20. The four wire ropes 23 are respectively connected to the rod 2 on the corresponding corrosion test piece 1. The arc-shaped holes 21 are located at the maximum wall thickness part of the cylinder 20. The thickness of the maximum wall thickness part of the cylinder 20 is 1 / 3 of the diameter of the corrosion test piece 1. In order to insert the corrosion test piece 1 into the target measurement position more smoothly and quickly, a planar structure 24 is arranged on the rod 22 near the corrosion test piece 1 side in this example. During use, the planar structure 24 is directly used to contact and strike the rod 2.

[0052] The specific steps for horizontally inserting the corrosion test pieces 1 into the strip-shaped slots are as follows: First, insert the cylindrical tool into the test hole so that the four arc-shaped holes 21 are respectively aligned with the four strip-shaped slots, and then use the rod 22 to horizontally strike the rod 2 until the outer end of the rod 2 is flush or substantially flush with the inner wall of the cylinder 20.

[0053] Step 5: Backfill the test hole with the original soil (the steps include: first, place the rod body 22 against the rod 2 and keep it vertical, then insert an oval rod outside the rod body 22 and against the rod body 22, then pour the original soil into the test hole and compact it, and cover the cylindrical tool with the original soil, and the depth of the top of the cylindrical tool from the reference ground is 5 cm), and perform karst erosion according to the set time (1 year);

[0054] Step 6: After the karst erosion is completed, take out the corrosion test piece 1 (the steps include: first, pull out the oval rod, then pull the rod body 22 laterally outwards until the corrosion test piece 1 is laterally drawn into the cylinder 20 and then lift the rod body 22);

[0055] Step 7: Calculate the daily average corrosion rate of the corrosion test piece 1,

[0056] Wash the taken-out corrosion test piece with pure water, put it in an oven at 105 °C and dry it for 24 h, weigh it twice again and take the average value W2, and the weighing accuracy is 0.01 mg; then calculate the daily average corrosion rate by the following formula:

[0057] ER = (W1 - W2) * 10000 / (T * S)

[0058] In the formula, ER is the daily average corrosion amount per unit area, that is, the corrosion rate (mg·m -2 ·d -1 ), W1 is the initial weight of the corrosion test piece (mg), W2 is the weight of the corrosion test piece after being buried (mg), T is the number of days of burial (d), and S is the surface area of the corrosion test piece (28.91 cm 2 ).

[0059] Adopting the scheme in this example, the process of digging a hole and inserting the corrosion test piece for a single measurement area only takes seven minutes, and the process of re-digging a hole to take out the corrosion test piece for a single measurement area takes even three minutes more. Example 3

[0060] Combined Figure 1 and Figure 2 As shown, a method for measuring the karst corrosion rate of carbonate rock includes the following steps:

[0061] Step 1: Select a test site around a certain mine, and the water content in the sandy soil at this test site is about 8%;

[0062] Step 2: Drill a test hole at the test site, use a drilling machine to drill the test hole, control the diameter of the test hole to be 12 cm, and control the depth of the test hole from the reference ground to be 60 cm;

[0063] Step 3: Open a horizontally arranged strip-shaped slit on the side wall of the test hole;

[0064] Specifically: A strip-shaped slot is opened by a sawing tool. The sawing tool includes a motor, the output end of the motor is connected to a rotating shaft 11, the bottom end of the rotating shaft 11 is movably connected to a support plate 13, and four groups of circular saw blades 12 are arranged at intervals on the rotating shaft 11. The distances of the four groups of circular saw blades 12 from the top reference point (reference ground) are 10 cm, 20 cm, 40 cm, and 50 cm respectively. Among them, the support plate 13 is a circular plate, a dovetail groove 14 is radially arranged on the support plate 13, the bottom end of the rotating shaft 11 is rotatably connected to a sliding member, the sliding member is fitted in the dovetail groove 14, and under the action of a lateral external force, the rotating shaft 11 can only move horizontally along the dovetail groove 14.

[0065] Step 4: Before each corrosion test piece is buried, it is washed with pure water and dried, weighed twice and the average value is taken, and the initial weight is recorded; The corrosion test pieces 1 are respectively inserted horizontally into the strip-shaped slots. The height of the strip-shaped slots is 1 - 3 mm larger than the thickness of the corrosion test pieces, and the depth of the strip-shaped slots is 3 - 5 mm larger than the diameter of the corrosion test pieces.

[0066] The corrosion test pieces 1 are respectively inserted horizontally into the strip-shaped slots with the aid of a cylindrical tool. The cylindrical tool includes a cylinder 20 with a closed bottom end and an open top end. Four arc-shaped holes 21 are arranged on the side wall of the cylinder 20. The four arc-shaped holes 21 correspond to the four groups of circular saw blades 12 in the height direction one by one. The height of each arc-shaped hole 21 is larger than the thickness of the corrosion test piece 1. It also includes a rod body 22 that can be inserted into the cylinder 20. Four wire ropes 23 arranged on the rod body 22 are respectively connected to the corresponding corrosion test pieces 1. A rod body 2 is radially arranged on the corrosion test piece 1. The rod body 2 is a steel needle with a diameter of 2 mm, and the length of the rod body 2 is larger than the maximum wall thickness of the cylinder 20. The four wire ropes 23 are respectively connected to the rod body 2 on the corresponding corrosion test piece 1. The arc-shaped holes 21 are located at the maximum wall thickness part of the cylinder 20, and the thickness of the maximum wall thickness part of the cylinder 20 is 2 / 3 of the diameter of the corrosion test piece 1. In order to insert the corrosion test piece 1 into the target measurement position more smoothly and quickly, a planar structure 24 is arranged on the rod body 22 of this example close to the side of the corrosion test piece 1. During use, the planar structure 24 is directly used to contact and strike the rod body 2.

[0067] The specific steps of inserting the corrosion test pieces 1 horizontally into the strip-shaped slots are as follows: First, insert the cylindrical tool into the test hole so that the four arc-shaped holes 21 are respectively aligned with the four strip-shaped slots, and then use the rod body 22 to horizontally strike the rod body 2 until the outer end of the rod body 2 is flush or basically flush with the inner wall of the cylinder 20.

[0068] Step 5: Backfill the test hole with the original soil (the steps include: first, keep the rod body 22 close to the rod body 2 and in a vertical state, then insert an oval rod outside the rod body 22 and close to the rod body 22, then pour the original soil into the test hole and compact it, and cover the cylindrical tool with the original soil. The depth of the top end of the cylindrical tool from the reference ground is 3 cm), and perform karst erosion according to the set time (1 year).

[0069] Step 6, after the karst erosion ends, take out the erosion test piece 1 (the steps include: first extract the elliptical rod, and then pull the rod body 22 laterally outwards until the erosion test piece 1 is laterally extracted into the cylinder 20 and then lift the rod body 22);

[0070] Step 7, calculate the daily average erosion rate of the erosion test piece 1.

[0071] Wash the taken-out erosion test piece with pure water, put it in an oven at 105°C and dry it for 24 h, weigh it twice again and take the average value W2, with the weighing accuracy of 0.01 mg; then calculate the daily average erosion rate by the following formula:

[0072] ER = (W1 - W2) * 10000 / (T * S)

[0073] In the formula, ER is the daily average erosion amount per unit area, that is, the erosion rate (mg·m -2 ·d -1 ), W1 is the initial weight of the erosion test piece (mg), W2 is the weight of the erosion test piece after being buried (mg), T is the number of days of burial (d), and S is the surface area of the erosion test piece (28.91 cm 2 ).

[0074] Adopting the solution in this example, the process of digging a pit and inserting the erosion test piece for a single measurement area only takes ten minutes, and the process of re-digging a pit to take out the erosion test piece for a single measurement area takes even four minutes.

[0075] In the present invention, one of the key points is that only a relatively small-diameter hole needs to be drilled and then, in cooperation with specific operation tools and operation methods, the erosion test piece can be smoothly and quickly buried and taken out. This solution hardly changes the original soil layer / geological structure at the test site, and can more accurately characterize the influence of the soil layer on the erosion rate test result (while in the traditional solution, a relatively large hole needs to be dug, and even after backfilling, the original soil layer / geological structure is changed). In the present invention, the second key point is that the tools with the aforementioned specific structures are adopted, and these tools are conducive to more flexibly, simply and quickly realizing the burial and taking out of the erosion test piece.

[0076] Adopting the solution in the embodiment, not only can the operation of burying and taking out the erosion test piece without the operator entering the pit be realized, but also the efficiency of measuring the erosion rate and the accuracy of the measurement result are significantly improved. More importantly, the operation difficulty of burying and taking out the erosion test piece is greatly reduced, and the process of taking out the erosion test piece is simpler, hardly damaging the erosion test piece. The test sampling location is hardly restricted by the terrain type, and it is applicable not only to sampling for erosion rate measurement in areas with high humidity, but also to sampling for erosion rate measurement in areas with less rainfall. Even in sandy soil areas, sampling can be smoothly carried out.

Claims

1. A method for measuring carbonate rock dissolution rate, characterized in that the steps include: Step 1, select the test location; Step 2: Drill a test hole at the test site, the depth of the test hole should not be less than 50 cm; Step 3, opening a transversely arranged strip slit (3) on the side wall of the test hole; Step 4, inserting the dissolution test pieces (1) into the strip-shaped slits (3) transversely, respectively, wherein the height of the strip-shaped slits (3) is 1 to 3 mm greater than the thickness of the dissolution test pieces; Step 5, backfill the test hole with original soil and perform karst erosion according to the set time; Step 6, after the karst erosion is completed, take out the erosion test piece (1); Step 7, calculating the average daily dissolution rate of the dissolution test piece (1); In step 3, a sawing tool is used to open the strip seam (3), the sawing tool comprising a motor, the output end of the motor is connected to a rotating shaft (11), the bottom end of the rotating shaft (11) is movably connected to a support plate (13), at least four groups of circular saw blades (12) are arranged on the rotating shaft (11) at intervals, and the distances between the four groups of circular saw blades (12) and the top reference point are 10 cm, 20 cm, 40 cm, and 50 cm respectively; The dissolution test pieces (1) are respectively inserted transversely into the strip-shaped slits (3) by means of a cylindrical tool, the cylindrical tool comprising a cylinder (20) with a closed lower end and an open upper end, at least four arc-shaped holes (21) being arranged on the side wall of the cylinder (20), the four arc-shaped holes (21) corresponding to the four groups of circular saw blades (12) therein in a one-to-one height direction, the height of each arc-shaped hole (21) being greater than the thickness of the dissolution test piece (1), and the cylindrical tool further comprising a rod body (22) capable of being inserted into the cylinder (20), four wire ropes (23) being arranged on the rod body (22) and respectively connected to the corresponding dissolution test pieces (1); a rod body (2) is radially arranged on the dissolution test piece (1), the length of the rod body (2) being greater than the maximum wall thickness of the cylinder (20), and the four wire ropes (23) being respectively connected to the rod body (2) on the corresponding dissolution test piece (1); The step of backfilling the test hole with original soil in step 5 comprises: firstly placing the rod body (22) against the rod body (2) and keeping it in a vertical state, then inserting an elliptical rod outside the rod body (22) and against the rod body (22), then pouring original soil into the test hole and compacting it, and covering the cylindrical tool with the original soil; The specific steps of taking out the corrosion test piece (1) in step 6 include: firstly pulling out the elliptical rod, then pulling the rod body (22) outward transversely, until the corrosion test piece (1) is pulled transversely into the cylinder (20), and then lifting the rod body (22).

2. The method for measuring carbonate rock dissolution rate according to claim 1, characterized in that: In step 2, a test hole is drilled using a drilling machine, and the diameter of the test hole is controlled to be 10~20cm.

3. The method for measuring carbonate rock dissolution rate according to claim 2, characterized in that: The support plate (13) is a circular plate, and a dovetail groove (14) is radially arranged on the support plate (13). The bottom end of the rotating shaft (11) is inserted into the dovetail groove (14), and the rotating shaft (11) can only move laterally along the dovetail groove (14).

4. The method for measuring carbonate rock dissolution rate according to claim 3, characterized in that: The arc-shaped hole (21) is located at the maximum wall thickness portion of the cylinder (20), and the thickness of the maximum wall thickness portion of the cylinder (20) is 1 / 3 to 1 / 2 of the diameter of the dissolution test piece (1).

5. The method for measuring carbonate rock dissolution rate according to claim 4, characterized in that: In step 4, the specific steps of inserting the dissolution test pieces (1) into the strip slits (3) transversely are as follows: first, insert the cylindrical tool into the test hole so that the four arc holes (21) are aligned with the four strip slits (3) respectively, and then use the rod body (22) to hit the rod body (2) transversely until the outer end of the rod body (2) is flush or substantially flush with the inner wall of the cylinder (20).

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