Clay sealing wall sampling detection assembly
By designing the clay seal wall sampling and testing components, the problem of uncertainty in the permeability detection of clay seal walls is solved, the accurate and complete acquisition of samples is achieved, and the detection accuracy is improved.
Patent Information
- Application Number
- CN202421328267.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-06-12
AI Technical Summary
The existing technology lacks unified testing standards and mature testing methods, resulting in uncertainty in the permeability detection of clay sealed walls, affecting quality control and construction management.
A clay sealed wall sampling and testing assembly is designed, including a drill core cylinder and a detection container. By installing a flip in the opening of the side wall of the drill core cylinder, sampling is facilitated, and a ring knife is used to cooperate with the sampling cylinder to achieve accurate and complete acquisition of samples.
This component improves sample detection accuracy and completeness, reduces sample disturbance, simplifies sampling and detection processes, and ensures the accuracy of permeability detection of clay sealed walls.
Smart Images
Figure CN222979102U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sampling detection of clay sealing walls, in particular to a sampling detection assembly for clay sealing walls. Background Technique
[0002] Vacuum preloading is an effective method for soft soil foundation reinforcement, which has the characteristics of low cost, good effect, short construction period, etc., and has been widely used in coastal areas. The vacuum preloading method is applicable to the reinforcement treatment of silt, silty soil, hydraulic fill and other soft soil foundations. When the soft clay foundation to be reinforced contains highly permeable soil layers, if vacuum preloading is used for reinforcement, the sealing treatment of the highly permeable soil layers is very important. For deeply buried highly permeable soil layers, the common treatment method is to drive clay sealing walls through a mixing pile rig. The clay sealing wall mainly includes bentonite, coupling agent, water and soil. The coupling agent is a polysaccharide modifier, which can make soil particles wrap and bond with each other to form a water-blocking and airtight wall. The coupling agent plays roles such as thickening, stabilizing, aggregating, sizing, bonding, and water-solidifying for the soil layer.
[0003] The clay sealing wall body is a flexible wall body, which is often in a paste state after reaching the age. Compared with the traditional cement-soil mixing pile sealing wall, it will not cause wall cracking due to soil body deformation and has good sealing performance, but the bearing capacity of the wall body itself is very low. The permeability of the clay sealing wall plays a crucial role in the vacuum preloading effect. However, at present, there is no unified detection standard and mature detection means for the permeability of the clay sealing wall in the foundation, which brings uncertainty to the quality control and construction management during the clay sealing process.
[0004] Therefore, it is necessary to sample and detect the water permeability of this clay sealing material, and standardized materials and precise sampling for inspection are required to achieve the purpose of accurate sampling data, so as to accurately detect the water permeability of the clay sealing material. At present, there is no method and device for standardizing the detection of the permeability of the clay sealing wall body, and only the experience of construction personnel can be relied on to judge the permeability of the clay sealing wall body.
[0005] Based on this, the utility model designs a sampling detection assembly for a clay sealing wall to solve the above problems. Content of the Utility Model
[0006] The utility model aims to provide a clay sealing wall sampling and detection component. The device has an opening in the side wall of the core barrel, and the side of the core barrel can be directly opened by a flip cover to expose the sample in the middle section of the core barrel, so that sampling is more convenient and labor-saving, and the sample is more accurate; such a sampling method can effectively reduce the disturbance of the sample, effectively improve the detection accuracy of the sample, and after sampling, it is directly temporarily sealed through the detection container, and there is no need to open the detection container until the detection, and the clay sealing material sample in the ring knife can be directly detected through the openings of the upper cover and the lower cover. After sampling, the sample is no longer moved, which ensures the integrity of the sample, with less interference and more accurate sample detection data.
[0007] The utility model is implemented as follows: a clay sealing wall sampling and detection component, comprising:
[0008] Sampling devices and test containers;
[0009] The sampling device comprises a core drill barrel, which is a cylinder with openings at both ends. The core drill barrel can be detachably mounted on the drill bit of the drilling tool. A flip cover is mounted on the side wall of the core drill barrel via a rotating shaft. The flip cover can be rotated and opened to be engaged and sealed with the core drill barrel. The flip cover and the core drill barrel are combined to form a complete cylinder.
[0010] The detection container comprises a sampling tube, a lower cover, a ring knife and an upper cover;
[0011] The sampling tube and the ring knife are both cylinders with upper and lower openings, and the detachable stabilizing frame of the ring knife is installed inside the sampling tube; positioning magnetic rings are embedded on the upper and lower end surfaces of the sampling tube;
[0012] The lower cover and the upper cover are circular barrel covers, and a covering magnetic ring is arranged around the outer edge of the top of the lower cover. The covering magnetic ring of the lower cover can be detachably sealed and adsorbed with the positioning magnetic ring at the bottom opening of the sampling barrel, the detachable sealing cover of the upper cover is detachably sealed at the top opening of the sampling barrel, and the detachable sealing of the lower cover is received at the bottom opening of the sampling barrel;
[0013] The outer wall of the upper cover is provided with a water outlet hole, and the outer edge of the bottom of the upper cover is also surrounded by a covering magnetic ring, and the covering magnetic ring of the upper cover can be separated and sealed and adsorbed with the positioning magnetic ring at the top opening of the sampling tube. The center of the bottom of the upper cover is also covered with a water-permeable plate, and a sealed cavity is formed between the upper cover and the water-permeable plate. The inner end of the water outlet hole is connected with the cavity of the upper cover and the water-permeable plate.
[0014] An exhaust hole and a water inlet hole are also arranged on the outer side wall of the lower cover, and a water-permeable plate is also covered at the center of the top of the lower cover to form a sealed cavity between the lower cover and the water-permeable plate; the exhaust hole and the water inlet hole are both connected to the cavity between the lower cover and the water-permeable plate.
[0015] Furthermore, magnetic strips are provided on the sides where the flip cover is fastened to the core drilling cylinder, and the flip cover and the core drilling cylinder are adsorbed to each other through the magnetic strips to be closed;
[0016] Chamfered grooves are also formed at the edges of the opening of the core drilling cylinder and the flip cover. The chamfered grooves are slopes and do not penetrate the core drilling cylinder and the flip cover;
[0017] The width c of the opening of the flip cover of the core drilling cylinder is greater than the outer diameter of the lower end of the core cutter; the lower end of the core cutter is an annular blade.
[0018] Furthermore, a circular mounting ring platform is formed at the top opening of the sampling cylinder in a downward direction. The opening diameter d of the mounting ring platform is greater than the caliber s of the sampling cylinder;
[0019] A retaining ring is provided on the outer circumference of the upper end of the core cutter. The retaining ring is detachably mounted on the mounting ring platform, and the outer diameter of the retaining ring is less than d and greater than s. The core cutter and the sampling cylinder are in clearance fit, and the retaining ring and the mounting ring platform are also in clearance fit.
[0020] Furthermore, the closing magnetic ring is an annular strong magnet. The closing magnetic ring is fixedly embedded in the top end face of the lower cover, and the top of the lower cover is flush with the closing magnetic ring fixed thereon;
[0021] The closing magnetic ring is fixed on the bottom end face of the upper cover, and the bottom of the upper cover is flush with the closing magnetic ring fixed thereon.
[0022] Furthermore, a sealing ring is provided on the lower end face of the upper cover. The upper cover is hermetically covered with the upper end of the sampling cylinder through the sealing ring;
[0023] A sealing ring is also provided on the top of the lower cover. The lower cover is hermetically covered with the lower end of the sampling cylinder through the sealing ring;
[0024] The sealing rings of the lower cover and the upper cover are both arranged around the outer circle of the water permeable plate, and the water permeable plate and the sealing ring are on the same plane.
[0025] The beneficial effects of the present utility model are as follows: 1. By adding a sampling device, the core drilling cylinder can effectively take samples. At the same time, a flip cover is installed on the side of the core drilling cylinder. When the core drilling cylinder drills down to take samples, the flip cover is closed, which is convenient for drilling and sampling. The middle section of the clay sample directly taken out from the formation can be directly exposed and displayed through the flip cover, making sampling more convenient. Moreover, the flip cover is tightly adsorbed to the core drilling cylinder through magnetic strips, making it convenient to close and open, and the operation is simple;
[0026] 2. The ring knife in the device can be stored with the sampling tube, and can be disassembled to insert the sample in the core drilling tube for sampling, which makes sampling more convenient. The entire ring knife can be inserted into the core drilling tube for sampling. The sampling operation is simple. There is no need to dig out the clay sample and fill it into the container, nor is there any need to press and fill it. The sample is kept intact and does not move during sampling, which effectively improves the integrity of the sample;
[0027] 3. After the device takes samples through the ring knife, the ring knife can be directly placed in the sampling tube for mounting. There is no need to transfer the clay layer sample of the clay sealing wall, and the entire sampling tube is sealed by the upper cover and the lower cover. After covering, it can be directly tested in the laboratory. There is no need to remove the sample during the test, nor is there a need to transfer the sample to the test equipment. The sampling tube of the device can be directly flushed with water to test the water permeability of the clay sample, which effectively reduces the disturbance of the sample and further improves the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.
[0029] Figure 1 This is a schematic diagram of the overall structure of the core drilling barrel of the utility model;
[0030] Figure 2 This is a front structural diagram of the vertical state of the core drilling barrel of the utility model;
[0031] Figure 3 This is a schematic diagram of the overall structure of the utility model detection container in a completed assembly state;
[0032] Figure 4 This is a schematic diagram of the utility model for detecting the disassembly state of a container;
[0033] Figure 5 This is a schematic diagram of the upper cover structure of the utility model when viewed from above;
[0034] Figure 6 This is a schematic diagram of the structure of the lower cover of the utility model in a disassembled state;
[0035] Figure 7 This is a schematic diagram of the connection status between the sampling tube of the utility model and the external detection equipment.
[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0037] 1-drilling core tube, 11-flip cover, 12-magnetic strip, 13-slant groove, 2-sampling tube, 21-positioning magnetic ring, 22-clamping ring platform, 3-lower cover, 31-exhaust hole, 32-water inlet hole, 4-water permeable plate, 41-covering magnetic ring, 42-sealing ring, 5-ring knife, 51-blocking ring. 6-upper cover, 61-water outlet, 7-water head device, 71-water inlet valve. DETAILED DESCRIPTION
[0038] See also Figures 1 to 7 As shown, the utility model provides a clay sealing wall sampling and detection component. In order to better understand the above technical solution, the above technical solution will be described in detail below in combination with the drawings in the specification and specific implementation methods.
[0039] In a specific embodiment of the technical solution of the utility model:
[0040] The sampling device comprises a core drill barrel 1, which is a cylinder with openings at both ends. The core drill barrel 1 can be detachably installed at the drill bit of the drilling tool. A flip cover 11 is installed on the side wall of the core drill barrel 1 through a rotating shaft. The flip cover 11 can be rotated and opened to be engaged and sealed with the core drill barrel 1. The flip cover 11 and the core drill barrel 1 are covered to form a complete cylinder. The sides where the flip cover 11 and the core drill barrel 1 are buckled are provided with magnetic strips 12. The flip cover 11 and the core drill barrel 1 are mutually adsorbed and sealed through the magnetic strips 12.
[0041] An inclined groove 13 is also provided at the edge of the opening between the core drill tube 1 and the flip cover 11. The inclined groove 13 is a slope and does not penetrate the core drill tube 1 and the flip cover 11.
[0042] The opening width c of the flip cover 11 of the core drilling barrel 1 is larger than the outer diameter of the lower end of the ring cutter 5; the lower end of the ring cutter 5 is an annular blade, and the height of the ring cutter 5 needs to be smaller than the diameter of the core drilling barrel 1 to ensure that the entire cross-sectional height of the core drilling barrel 1 is sufficient to fill the ring cutter 5.
[0043] The detection container comprises a sampling tube 2, a lower cover 3, a ring knife 5 and an upper cover 6;
[0044] The sampling tube 2 and the ring knife 5 are both cylinders with upper and lower openings, and a detachable stable frame of the ring knife 5 is installed inside the sampling tube 2; positioning magnetic rings 21 are embedded on the upper and lower end surfaces of the sampling tube 2; the top opening of the sampling tube 2 is downwardly provided with a circular clamping ring platform 22, and the opening diameter d of the clamping ring platform 22 is larger than the caliber s of the sampling tube 2;
[0045] A retaining ring 51 is provided on the outer ring of the upper end of the ring knife 5. The retaining ring 51 can be detachably mounted on the clamping ring platform 22, and the outer diameter of the retaining ring 51 is less than d and greater than s. The ring knife 5 and the sampling tube 2 are clearance fit, and the retaining ring 51 and the clamping ring platform 22 are also clearance fit. The diameter of the ring knife 5 is smaller than the internal aperture s of the sampling tube 2, which is convenient for clamping and assembly, and each gap does not exceed 0.5mm, ensuring stable and accurate pressing.
[0046] The lower cover 3 and the upper cover 6 are circular barrel covers. A covering magnetic ring 41 is also arranged around the outer edge of the top of the lower cover 3. The covering magnetic ring 41 of the lower cover 3 can be detachably sealed and adsorbed with the positioning magnetic ring 21 at the bottom opening of the sampling barrel 2. The upper cover 6 can be detachably sealed and covered at the top opening of the sampling barrel 2. The lower cover 3 can be detachably sealed and received at the bottom opening of the sampling barrel 2.
[0047] On the outer side wall of the upper cover 6, a water outlet hole 61 is provided. On the outer edge of the bottom of the upper cover 6, a closing magnetic ring 41 is also arranged in a ring shape. The closing magnetic ring 41 of the upper cover 6 can be detachably and hermetically adsorbed to the positioning magnetic ring 21 at the top opening of the sampling cylinder 2. At the center of the bottom of the upper cover 6, a water permeable plate 4 is also covered. A sealed cavity is formed between the upper cover 6 and the water permeable plate 4. The inner end of the water outlet hole 61 communicates with the cavity between the upper cover 6 and the water permeable plate 4. A sealing ring 42 is arranged on the lower end face of the upper cover 6. The upper cover 6 is hermetically covered with the upper end of the sampling cylinder 2 through the sealing ring 42. The sealing ring 42 on the upper cover 6 and the upper end face of the sampling cylinder 2 are pressed tightly by the magnetic adsorption of the closing magnetic ring 41 and the positioning magnetic ring 21.
[0048] The closing magnetic ring 41 is an annular strong magnet, and the closing magnetic ring 41 is fixedly embedded on the top end face of the lower cover 3. The lower cover 3 is flush with the top of the fixedly installed closing magnetic ring 41 thereon.
[0049] The closing magnetic ring 41 is fixed on the bottom end face of the upper cover 6, and the upper cover 6 is flush with the bottom surface of the fixedly installed closing magnetic ring 41 thereon.
[0050] A sealing ring 42 is also arranged on the top of the lower cover 3. The lower cover 3 is hermetically covered with the lower end of the sampling cylinder 2 through the sealing ring 42. The sealing ring 42 on the lower cover 3 and the lower end face of the sampling cylinder 2 are also hermetically sealed by the magnetic adsorption and extrusion of the closing magnetic ring 41 and the positioning magnetic ring 21.
[0051] The sealing rings 42 of the lower cover 3 and the upper cover 6 are both arranged in a ring shape outside the water permeable plate 4. The sealing ring 42 of the lower cover 3 is arranged in a ring shape on the outer ring of the water permeable plate 4 at the top of the lower cover 3. Similarly, the sealing ring 42 of the upper cover 6 is also arranged in a ring shape on the outer ring of the water permeable plate 4 at the bottom of the upper cover 6, and the water permeable plate 4 and the sealing ring 42 are on the same plane.
[0052] An exhaust hole 31 and a water inlet hole 32 are also arranged on the outer side wall of the lower cover 3. At the center of the top of the lower cover 3, a water permeable plate 4 is also covered. A sealed cavity is formed between the lower cover 3 and the water permeable plate 4. The exhaust hole 31 and the water inlet hole 32 both communicate with the cavity between the lower cover 3 and the water permeable plate 4 to facilitate water seepage. Finally, when detecting the clay sample, it is necessary to inject water and exhaust air into the sampling cylinder 2. The water outlet hole 61, the exhaust hole 31 and the water inlet hole 32 are all threaded holes to facilitate the installation of other external devices.
[0053] When detecting, other devices also need to be installed. An exhaust valve 33 is installed on the exhaust hole 31, a water head device 7 is connected to the water inlet hole 32. A water outlet pipe is arranged at the bottom of the water head device 7, and a water supply valve 71 is arranged between the water head device 7 and the water inlet hole 32. A water thermometer also needs to be installed on the water outlet hole 61 to facilitate recording the water temperature. Similarly, a water thermometer also needs to be installed in the water head device 7. The water head device 7 of these detection devices belongs to a conventional structure, and the connection method is also a conventional structure, which will not be elaborated here.
[0054] It should be noted that:
[0055] 1. Currently, the sampling is all about testing the hard soil cores. Because of the difficulty in sampling, there is no step of sampling and testing clay, and no engineering team has detected the water permeability of clay. The engineering quality has not considered the problem of water permeability either. Although it is now known that the water permeability will have an adverse impact on the clay sealing wall project, no one has considered establishing a data comparison for the water seepage rate. This device samples clay in a more rigorous way, then sends it for inspection. The detected data is accurate, and it correlates and evaluates the clay water seepage rate with the project to obtain effective data, which promotes the establishment of the data model. 2. Because of its high viscosity, it is difficult to sample clay without damaging the structure of the sample itself. Currently, if sampling is needed, the sample needs to be hammered or pushed out from the drill pipe, and then packed and sent for inspection. If it is clay, a spatula is used to pick out the clay and fill it into the container, and then leveled and regularized. The sampling effect is poor. When this device samples, the clay sealing wall sample in the core barrel 1 is not moved or changed at all. The sampling ensures its integrity, and during the whole sampling process, it is taken out together with the serial knife 5, and then the sample is put into the sampling barrel 2. The whole inspection and sampling process will not stir the sample, ensuring that all links of the sample can remain intact. 3. For the existing samples, when sending them for inspection, the clay samples still need to be taken out and then filled into the water seepage rate detection container for water injection detection, which once again damages the structure of the sample. After these steps are completed, the whole detected sample is no longer in the actual structure in the underground soil layer, resulting in a large error in the sample data. When this device is sent for inspection, there is no need to change the container again. Just directly conduct a flushing test through the sampling barrel 2 to detect the water seepage rate. While the operation is simple, the whole soil layer structure remains unchanged, ensuring that the data obtained from the detection is for the soil layer characteristics of the sampling location.
[0056] The water head device 7 of this device is a device for controlling the water head and supplying water in a variable head permeameter. The variable head permeameter is a commonly used detection device, which mainly calculates the permeability coefficient through the changing water head and time. This device only needs to connect the existing water head device to the water inlet hole 32 and set the height difference parameter for use.
[0057] When the present invention samples:
[0058] Step 1: After the on-site clay sealing wall is constructed and cured for 10 days, since the permeability coefficient of the clay sealing material does not change significantly after 10 days of age, it is necessary to cure for 10 days. Use an electric soil drill to calibrate the approximate horizontal center position of the sampling point as the pile diameter of the clay sealing wall. The core sampling can be carried out in the way that the double-row mixing piles should stagger in width. Take the core downward from 1.5 meters below the top surface of the wall as the reference surface. The water content of the clay sealing material above 1.5 meters is too high (in actual projects, the 1.5-meter clay sealing material only serves as the curing slurry and does not play a sealing role) and cannot be used as a reference sample. Sample downward from the center of the clay sealing wall. During the core sampling process, the downward pressure rate of the drill tool should be controlled to reduce sample disturbance. Then, go to the core barrel 1 to drill the sample. When sampling, it is necessary to pre-drill 1.5 meters deep and discard the samples within this depth range, and re-drill and sample with 1.5 meters depth as the reference surface, and take the center depth positions of multiple sealing wall units; when the wall is 4.5 meters deep, remove the top 1.5 meters, and the center depth position for sampling is 3 meters below the top of the wall, and the error within 0.2 meters is acceptable. Ensure that the middle position of the core barrel 1 is at the center depth position of the wall unit. The depth of each wall unit is different, and when sampling, it is subject to the actual depth. Ensure that the ring knife sampling is at the center of the clay sealing wall unit. Through the previously poured structure, the depth of each soil layer structure can be known in advance, and the depth required for drilling and sampling by this device can be obtained. The sealing wall unit refers to the unit division according to the original soil layer, and different soil layers form different units;
[0059] The electric soil drill is supported by a conventional bracket. The drill tool is lifted and lowered electrically by the bracket to provide downward pressure for drilling the soil. The structure of this drill tool is a conventional structure and will not be elaborated. Ensure the stability of sampling. The core barrel 1 is thin-walled, about 2 meters long, and the outer diameter is 70 mm. The lower end of the core barrel 1 is a sharp blade, and the blade edge can cut the soil sample. The core barrel 1 and the side edge of the flip cover 11 are fitted and closed by adsorption through the magnetic strip 12. Remove the core barrel 1, insert a flat-tip screwdriver into the inclined groove 13, and turn the flip cover 11 to the side to open the side window of the entire core barrel 1 for easy sampling.
[0060] Step 2: Take out the ring knife 5, vertically insert the lower blade of the ring knife 5 into the core sample inside the opening of the flip cover 11, and try to control the axis of the ring knife 5 perpendicular to the axis of the core barrel 1. When sampling, the ring knife 5 should be as close as possible to the middle depth position of the sample, and sample parallelly 2 times, that is, at least sample on both sides. The sample axes of the two samplings are parallel to each other in the same plane. Horizontally insert the ring knife 5 into the sampling cylinder 2 until the clay sample overflows from the outer end of the ring knife 5. Take out the ring knife 5, scrape the clay samples on the upper and lower surfaces of the overflowing ring knife 5 flat. When cutting the soil with the ring knife 5, try to avoid structural disturbance. When there are defects, it can be repaired slightly, and the surface of the sample should not be repeatedly smeared with a spatula. When the sampling defect is serious, re-sampling should be carried out to ensure the original state of the sampled clay soil mass;
[0061] Step 3: Apply a layer of vaseline on the inner wall of the sampling cylinder 2 to improve lubrication and facilitate the insertion of the core cutter 5 into the sampling cylinder 2. Immediately after sampling, place the core cutter 5 into the sampling cylinder 2, so that the retaining ring 51 is stuck on the clamping ring platform 22, and use the upper cover 6 and the lower cover 3 to seal the upper and lower openings of the sampling cylinder 2. Add the sealing ring 42 and the permeable plate 4 to tightly block the samples at the upper and lower ends of the core cutter 5 to prevent the samples from leaking. While sealing the sampling cylinder 2, it does not affect its water permeability;
[0062] Step 4: Conduct a variable-head permeability test within 3 hours after sampling; if the test cannot be carried out within 3 hours, the entire sampling cylinder 2 loaded with the core cutter 5 shall be sealed before the test, and cured under the conditions of a temperature of 20±2°C and a relative humidity of more than 95%.
[0063] The test method for the permeability coefficient of a single sampling is as follows:
[0064] Step 1: A water head device 7 and an exhaust valve 33 are required during the test. The lower water inlet hole 32 of the sampling cylinder 2 with the sample is hermetically connected to the bottom of the water head device 7 through the exhaust valve 33, and an exhaust valve 33 is installed on the exhaust hole 31. The exhaust valve 33 is a conventional air valve. Install a water thermometer on the water outlet hole 61 of the upper cover 6, install a water outlet pipe on the water outlet hole 61 and connect it to a water collection container;
[0065] Step 2: Close the inlet valve 71. Close the inlet valve 71 connected to the water inlet hole 32, fill the water head device 7 with experimental water. The experimental water is pure water prepared by the air extraction method or the boiling method. The variable-head pipe and the water supply bottle of the water head device 7 should be placed above the sampling cylinder 2. The liquid level height of the variable-head pipe is preferably 1.2 - 1.5 meters. After the liquid level in the water head device 7 is stable, open the water supply valve 71 to connect the water head device 7 with the sampling cylinder 2. The experimental water in the water head device 7 will continuously flow into the water inlet hole 32 under the action of gravity; open the pipe exhaust valve 33 connected to the exhaust hole 31 to remove the air at the bottom of the sampling cylinder 2 until there are no bubbles in the water overflowing from the water outlet hole 61, then close the exhaust valve 33;
[0066] Step 3: Let it stand for a certain period of time, which can be 3 minutes, under a certain water head. Wait until there is continuous water flow overflowing from the water outlet hole 61, and start measuring the test data;
[0067] Step 4: Fill the variable-head pipe in the water head device 7 with water to a fixed height of 1.3 meters and keep this height. Stop injecting water into the variable-head pipe in the water head device 7. Start measuring and recording the initial water head of the variable-head pipe in the water head device 7 at this time, that is, the liquid level height. It can be measured by a liquid level ruler or a liquid level scale can be pre-marked in the water head device 7 in advance. At the same time, measure and record the water temperature at the water outlet 61. Measure and record the water level and temperature data every 120s. Do this continuously for 2 times, and take the average value of the 2 test values as the result of this sampling test. If the error between the 2 tests exceeds ±2.0×10-n (where n is the number of decimal places for the smaller value and is a positive integer), this test is invalid.
[0068] The single permeability coefficient can be calculated through the method described in Article 16.3.3 of the "Standard for Geotechnical Test Methods" GB / T 50123-2019. There are various algorithms for calculating the permeability coefficient. This device and method are only to provide more standardized samples to obtain more accurate data for sample testing.
[0069] Step 5: Repeat the test in Step 4 at least 3 times. Each time, the liquid level of the variable-head tube in the head device 7 needs to be readjusted to make the liquid level in the variable-head tube of the head device 7 rise back to the designed fixed height of 1.3 meters.
[0070] Repeat the operation in Step 4 3 times. The measured results will obtain 3 data. The error between the maximum value and the minimum value is within ±2.0×10 -n (where n is the number of decimal places for the minimum value and is a positive integer). Finally, take the average of these 3 data as the permeability coefficient of the specimen.
[0071] Step 6: Perform the operations in Steps 1-5 on both of the 2 samples obtained. Both samples need to be tested. Take the average of the permeability tests of the 2 samples as the final permeability coefficient of this sampling operation.
[0072] When detecting the entire clay sealing wall, multiple different sealing wall units need to be sampled and detected. The permeability coefficient is calculated separately for each sampling point. Finally, the multi-point permeability coefficients of the entire clay sealing wall are obtained to form a comprehensive evaluation of the permeability coefficient of the entire clay sealing wall.
[0073] For the entire sealing wall, the original soil layers at different depths have different soil qualities. After different soil qualities are mixed with the injected bonding slurry during construction, the wall forms different structures, resulting in different permeabilities. This solution can detect and sample the walls at different depths, and finally form a schematic diagram of the permeability rates at different depths of the wall. The permeability rates at different depths of the sealing wall are marked, so as to obtain the permeability at different depths of the entire wall for targeted subsequent construction.
[0074] Although the specific implementation manners of the present invention are described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope protected by the claims of the present invention.
Claims
1. A clay sealing wall sampling and detection component, characterized in that: include: Sampling devices and test containers; The sampling device comprises a core drill barrel (1), the core drill barrel (1) is a cylinder with openings at both ends, the core drill barrel (1) can be detachably mounted on the drill bit of a drilling tool, a flip cover (11) is mounted on the side wall of the core drill barrel (1) via a rotating shaft, the flip cover (11) can be rotated to be opened and sealed with the core drill barrel (1), and the flip cover (11) and the core drill barrel (1) are covered to form a completely closed cylindrical structure. The detection container comprises a sampling tube (2), a lower cover (3), a ring knife (5) and an upper cover (6); The sampling tube (2) and the ring knife (5) are both cylinders with openings at the top and bottom, and a detachable stabilizing frame of the ring knife (5) is installed inside the sampling tube (2); positioning magnetic rings (21) are embedded on both upper and lower end surfaces of the sampling tube (2); The lower cover (3) and the upper cover (6) are circular barrel covers. A covering magnetic ring (41) is also arranged around the outer edge of the top of the lower cover (3). The covering magnetic ring (41) of the lower cover (3) can be detachably sealed and adsorbed with the positioning magnetic ring (21) at the bottom opening of the sampling barrel (2). The detachable sealing cover of the upper cover (6) is detachably sealed at the top opening of the sampling barrel (2), and the detachable sealing of the lower cover (3) is received at the bottom opening of the sampling barrel (2). The outer wall of the upper cover (6) is provided with a water outlet hole (61), and the outer edge of the bottom of the upper cover (6) is also provided with a covering magnetic ring (41). The covering magnetic ring (41) of the upper cover (6) can be separated and sealed and adsorbed with the positioning magnetic ring (21) at the top opening of the sampling tube (2). The center of the bottom of the upper cover (6) is also covered with a water-permeable plate (4), and a sealed cavity is formed between the upper cover (6) and the water-permeable plate (4). The inner end of the water outlet hole (61) is connected with the cavity between the upper cover (6) and the water-permeable plate (4); An exhaust hole (31) and a water inlet hole (32) are also provided on the outer side wall of the lower cover (3); a water-permeable plate (4) is also covered at the center of the top of the lower cover (3); a sealed cavity is formed between the lower cover (3) and the water-permeable plate (4); and the exhaust hole (31) and the water inlet hole (32) are both connected to the cavity between the lower cover (3) and the water-permeable plate (4).
2. A clay sealing wall sampling and detection assembly according to claim 1, characterized in that: The sides where the flip cover (11) and the core drilling tube (1) are buckled are provided with magnetic strips (12), and the flip cover (11) and the core drilling tube (1) are mutually attracted and sealed by the magnetic strips (12); An inclined groove (13) is also provided at the edge of the opening between the core drilling barrel (1) and the flip cover (11); the inclined groove (13) is a slope and does not penetrate the core drilling barrel (1) and the flip cover (11); The opening width c of the flip cover (11) of the core drilling barrel (1) is greater than the outer diameter of the lower end of the ring cutter (5); the lower end of the ring cutter (5) is an annular blade.
3. A clay sealing wall sampling and detection assembly according to claim 1, characterized in that: The top opening of the sampling tube (2) is downwardly provided with a circular clamping ring platform (22), and the opening diameter d of the clamping ring platform (22) is larger than the caliber s of the sampling tube (2); A retaining ring (51) is arranged on the outer ring of the upper end of the ring knife (5). The retaining ring (51) is detachably mounted on the clamping ring platform (22). The outer diameter of the retaining ring (51) is smaller than d and larger than s. The ring knife (5) and the sampling tube (2) are clearance-fitted, and the retaining ring (51) and the clamping ring platform (22) are also clearance-fitted.
4. A clay sealing wall sampling and detection assembly according to claim 1, characterized in that: The covering magnetic ring (41) is a strong annular magnet, and the covering magnetic ring (41) is fixedly embedded on the top end surface of the lower cover (3), and the lower cover (3) is flush with the top of the covering magnetic ring (41) fixed thereon; The covering magnetic ring (41) is fixed to the bottom end surface of the upper cover (6), and the upper cover (6) is flush with the bottom surface of the covering magnetic ring (41) fixed thereon.
5. The clay sealing wall sampling and detection assembly according to claim 1, characterized in that: A sealing ring (42) is provided on the lower end surface of the upper cover (6), and the upper cover (6) is sealed with the upper end of the sampling tube (2) through the sealing ring (42); A sealing ring (42) is also provided on the top of the lower cover (3), and the lower cover (3) is sealed with the lower end of the sampling tube (2) through the sealing ring (42); The sealing rings (42) of the lower cover (3) and the upper cover (6) are both arranged around the outer ring of the water-permeable plate (4), and the water-permeable plate (4) and the sealing ring (42) are on the same plane.