CN109297872B - Isotope tracking technology-based induced penetration grouting test device and test method - Google Patents
Isotope tracking technology-based induced penetration grouting test device and test method Download PDFInfo
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- CN109297872B CN109297872B CN201811457039.0A CN201811457039A CN109297872B CN 109297872 B CN109297872 B CN 109297872B CN 201811457039 A CN201811457039 A CN 201811457039A CN 109297872 B CN109297872 B CN 109297872B
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Abstract
The invention discloses an isotope tracking technology-based induced permeation grouting test device, which comprises an induced permeation grouting device and a real-time isotope monitoring device. The device for inducing permeation grouting consists of a test disc, a micro injection pump, a water feeding pump, a water suction pump, a sealing screw rod and various connecting pipes, and the real-time monitoring device consists of a gamma camera and a display screen. The invention also discloses a test method using the device, and the test device and the test method mainly use the principle that pumping water forms pressure difference to induce slurry to directionally permeate and the principle of gamma radioactive source isotope tracing. The test device has a simple structure, and the test method is convenient to operate, so that the smooth development of the induced penetration grouting test and the visualization of the whole grouting process are realized, and powerful theoretical support is provided for researching artificial induced slurry directional penetration.
Description
Technical Field
The invention relates to a rock-soil test technology, in particular to an isotope tracking technology-based induced penetration grouting test device and a test method.
Background
Various problems are very easily encountered in underground engineering construction: for example, the problems of uneven settlement of foundation in the house construction process, large deformation of surrounding rock and the like often occur in projects such as subway tunnels and the like, and especially in coastal areas, complicated and multiphase sediments, geological disasters such as deformation instability and the like are extremely easy to occur, so that huge personnel and property losses are caused. The reasonable grouting method is adopted to lift the foundation and strengthen the surrounding rock, so that the method is an effective means for treating underground disasters in recent years. Osmotic grouting is increasingly used as one of grouting modes, and is particularly applied to sandy argillaceous stratum.
Because the structural surface with the size exists in the rock-soil body, the diffusion direction of the slurry is not fixed, the diffusion range is difficult to predict, the injection parameters of the slurry are difficult to calculate, the grouting reinforcement effect is greatly weakened, and the grouting reinforcement effect is far from expectations. Furthermore, improper grouting treatment causes serious secondary injury. Because of the concealment of underground engineering, the operational experience of people for grouting engineering is far beyond the theoretical research progress.
The root is that the slurry permeation direction is uncontrollable, so that a plurality of problems are complicated, and the induction of slurry permeation in a reasonable direction is an effective means for solving the current problems. At present, research on methods for inducing directional infiltration grouting is few by scientific researchers, so that research on related induced directional experiments is needed to be carried out. In addition, the final result of the grouting related test can be determined only by excavating a rock mass, and determining the real-time direction of the slurry is the key to the success of the test, which is a bottleneck that is difficult to break through in the current grouting related test.
In the prior art, china patent 201510569171.0, a visual grouting test device and a visual grouting test method for fractured rock mass, discloses a test device for realizing visualization of grouting process by using a CT scanning device, but the grouting test device is very trace in grouting liquid, if the proportion of barium sulfate and the grouting liquid which are not well controlled is difficult to achieve the target effect, and the sandy rock mass is difficult to split grouting, and the difference from the actual situation is larger.
Isotope tracing technology has been exposed at the beginning of the geological science, but is mainly applied to aspects of measuring geological age, oil and gas exploration and the like, no study is made on real-time tracking of substances by utilizing radioactive isotopes, and in the prior medical technology, an on-line oxygen-15 water synthesizing device with the Chinese patent number of 200820183469.3 provides a device capable of preparing oxygen-15 water in a ready-to-use mode and preparing oxygen-15 isotopes by utilizing the device.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a test device and a test method which can track the forward direction of slurry in real time by utilizing the induced slurry directional permeation and based on an isotope tracing technology.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an induced penetration grouting test device based on an isotope tracing technology comprises an induced penetration grouting device and a real-time isotope monitoring device arranged on one side of the induced penetration grouting device; the main body of the induced penetration grouting device is a cylindrical transparent test disc with an opening at the upper part, a water inlet hole is formed in the center of the bottom of the transparent test disc, the edges of the upper end and the lower end of the transparent test disc extend outwards horizontally to form annular extending parts, the upper annular extending parts and the lower annular extending parts of the transparent test disc are fixedly connected with a top cover and a bottom cover respectively through connecting pieces, an inclined channel is formed in the bottom cover, one end of the channel is upwards communicated with the water inlet hole of the transparent test disc, and the other end of the channel extends to the side surface of the bottom cover and is connected with a water inlet and outlet device through a water inlet pipe;
the center of the top cover is provided with a grouting hole, three groups of induction holes are formed in the outer side of the grouting hole along the radial direction of the top cover, an included angle between radial lines penetrated by two adjacent groups of induction holes is 45 degrees, and the grouting hole is connected with the microinjection pump through a grouting pipe; the outside of the three groups of induced holes is connected with a water inlet and outlet device through a drain pipe, the lower parts of the three groups of induced holes are connected with a water pumping pipe extending to the inner bottom of the transparent test disc, the pipe wall of the water pumping pipe is provided with a plurality of water pumping holes communicated with the inner cavity of the water pumping pipe, and the outside of the water pumping pipe is provided with a filter screen for preventing a sample from blocking the pipeline;
a layer of filter screen is paved on the inner bottom of the test disc, and a sample is fixed to prevent the sample from blocking a water supply pipeline.
Each group of the induction holes comprises two through holes on the same radial line, the two through holes and the grouting hole are on the same radial line, and the center distance between the two through holes is equal to the center distance between the grouting hole and the nearest through hole. The guiding hole can induce the slurry to move directionally.
Each induction hole is provided with a hollow screw which penetrates through the whole body in a sealing manner through glass cement, the lower part of the hollow screw is connected with a water pumping pipe positioned in a transparent test disc, the upper part of the hollow screw is connected with a water draining pipe, and the tail ends of a plurality of parallel water draining pipes are combined and connected together through a communication valve to form a water draining pipe connected with a water inlet and outlet device.
The transparent test disc is of a cylindrical structure with an opening at the upper part, and only one water feeding hole is formed in the bottom of the test disc in a sealing mode. The top cover and the bottom cover are both disc-shaped, and are made of organic glass materials.
The water feeding hole is sealed with a hollow screw penetrating through the whole body through glass cement, and the hollow screw is communicated with a water inlet pipe inserted into the channel.
The water inlet and outlet device comprises a water storage barrel which is respectively connected with two water pumps through two different pipelines, one water pump is a water inlet pump, the water inlet pump is communicated with the water inlet pipe, the other water pump is a water suction pump, and the water suction pump is communicated with the water drain pipe.
And the water stop clamps are arranged on the water inlet pipe and the water outlet pipe.
An annular groove is arranged on the lower surface of the top cover corresponding to the upper annular extension part of the transparent test disc, and a rubber sealing ring is arranged in the annular groove. Can make the connection between the two inseparable, avoid the air to get into in the device influence test effect, guarantee the leakproofness of device.
The upper and lower annular extension parts of the transparent test disc, and the corresponding parts of the top cover and the bottom cover are provided with connecting holes. The upper annular extension part, the lower annular extension part, the top cover and the bottom cover are correspondingly connected together through the connecting holes by the connecting piece to form a whole.
The connecting piece is a sealing screw.
The grouting hole is internally provided with a hollow screw which is integrally penetrated through by glass cement in a sealing way, the upper port of the hollow screw is connected with a grouting pipe, and the grouting pipe is connected with a microinjection pump.
The micro injection pump comprises two independent injection pipes, wherein the prepared slurry is placed in one injection pump, the marked oxygen-15 water is placed in the other injection pipe, the two injection pipes are respectively and correspondingly connected with two different infusion pipes, the tail ends of the two infusion pipes form a grouting pipe by using a tee joint, and the grouting pipe is connected with the grouting hole by using a hollow screw.
The real-time isotope monitoring device comprises a display screen connected with the gamma camera.
The slurry contains radioisotope and is used for synthesizing oxygen-15 water by using an on-line oxygen-15 water synthesizing device of China patent No. 200820183469.3 in the prior art. The water produced from the slurry contains very small amounts of oxygen-15, which does not affect the slurry properties. Oxygen-15 is a radioisotope of the gamma radiation source that reacts to emit gamma rays and thus acts as a tracer for the slurry.
The hollow screw is connected with various holes by glass cement, so that the tightness of the hollow screw is ensured. For better connection with the water inlet pipe, the upper part of the screw is provided with saw-tooth-shaped bulges. Each screw is provided with a proper nut, firstly, the connecting pipe and the hollow screw are fixed, and secondly, the tightness of the device is better ensured.
The water in the water storage barrel is used for both water inlet to saturate the sample and water pumped by the water suction pump. Realizing cyclic utilization and saving resources.
The water inlet pipe, the water suction pipe and the grouting pipe are all made of common rubber materials with two open ends.
The injection tube is filled with radioactive oxygen-15 water, and is made of aluminum pot material, so that the injury to human body is prevented.
The hollow screw and the sealing screw are made of stainless steel materials, so that the connection is tight.
The gamma camera detection device comprises a probe and an electronic circuit. The probe includes a collimator, scintillation crystal, phosphor screen, etc., which receives gamma rays. The oxygen-15 slurry enters the soil body to decay to emit positrons, and is annihilated with negative electrons in the soil body to be converted into a pair of gamma photons, and emitted gamma rays can be received by the scintillation crystal.
The display screen consists of an oscilloscope and a camera, the camera can be aimed at the oscilloscope to shoot, and the display system is realized by the display of a microcomputer at present.
An isotope tracking technology-based induced penetration grouting test method comprises the following steps:
1): connecting the bottom of the test disc with a water inlet pipe with a water stop clamp, fixing the bottom cover by using a sealing screw rod, guiding the water inlet pipe out of the bottom cover, and sequentially connecting a water inlet pump and a water storage barrel; uniformly mixing sand and soil in a natural state according to a preset proportion, preparing a simulated soil sample of an injected medium, loading the simulated soil sample into a test disc in a state that an upper water hole is closed, and compacting;
2): the grouting holes are connected with a grouting pipe and a microinjection pump through hollow screws; the microinjection pump is provided with two injection pipes, wherein one injection pipe is filled with prepared slurry, and the other injection pipe is temporarily filled with common water; two injection pipes are respectively connected with one section of grouting pipe and then a tee joint is used for synthesizing a total grouting pipe; the hollow screw is arranged in the induction hole, the lower end of the hollow screw is connected with a porous water suction pipe with a filter screen, the upper end of the hollow screw is connected with a drain pipe with a water stop clamp, and a total drain pipe is synthesized by a communication valve and then connected with a water suction pump and a water storage barrel; a section of air is discharged in the drain pipe, and the top cover is fixed by a sealing screw rod; after the device is assembled and air is discharged, a water inlet pump is started to saturate soil samples in the test disc, and when water is seen to emerge from the induction hole, the soil samples are fully saturated;
3): after the sample is saturated, the water inlet pump is closed, the water stop clamp is closed, the water inlet pipe is still in water, a liquid seal is formed, and air is prevented from entering; the water suction pump is started, at the moment, only the water suction pipe and the water discharge pipe of one induction hole are opened, the rest water suction pipes are closed by the water stop clamp, water is pumped, the water is discharged into the water storage barrel, and at the moment, a certain pressure difference exists between the side with the induction hole and the side without the induction hole of the test disc;
4): replacing the common water in the injection tube with oxygen-15 water;
5): placing the test device under a gamma camera, opening a microinjection pump, keeping grouting pressure constant, and continuously grouting for one minute; at the same time of grouting, the display screen can image in real time, and track the forward direction of the slurry containing the oxygen-15 isotope, which represents the permeation direction of the slurry;
6): after the test is finished, taking out the soil sample, and preparing soil according to the same sand-mud ratio; under the condition of the same other conditions, changing the positions of the induction holes, selecting another induction hole, and repeating the steps 2) to 5) until all the induction holes are tested;
7): after the step is finished, selecting different induction hole combinations under the condition of the same other conditions, and repeating the steps 2) to 5);
8): taking out the soil sample after the test is finished, changing the proportion of a preset soil sample, and compacting; repeating steps 2) to 7) under the condition of the same other conditions;
9): after the test is completed, repeating at least 3 groups of tests, and comparing the test results scanned by the same grouting time and the same grouting pressure at different soil sample sand-cement ratios and different induced holes to obtain the motion rule of induced slurry directional penetration grouting.
The beneficial effects of the invention are as follows:
1. the invention realizes the research of induced directional infiltration grouting, a certain arrangement of the induced holes are arranged on the experimental device, different combinations of the induced holes are selected for pumping water to form negative pressure in the experimental process, and the slurry can move along the direction of small air pressure under ideal conditions, so that the aim of inducing the slurry to move directionally can be achieved.
2. A large number of experiments of scientific researchers select grouting and then excavate a rock-soil body, observe the grouting and adding solid form, the method is time-consuming and labor-consuming, the adding solid can be damaged after being slightly processed improperly, and the work is lost. The invention provides an advanced isotope tracing means in biomedical treatment for the first time, which has high sensitivity, short half-life of the selected oxygen-15 and light damage to the outside. The isotope required by the test is trace, the cost is considerable, the visualization of the grouting process is realized, and the concealment of the grouting test is effectively avoided.
3. The device designed by the invention adopts organic glass, so that the distribution of slurry is more obvious in the gamma camera monitoring process, and the test result is more reliable. The sealing screw and the rubber ring are adopted in the sealing device, the sealing requirement on the test device is high under the condition of almost approaching vacuum after water pumping, and the sealing device well solves the problem of the sealing property of the device. The good test device lays a solid foundation for test operation and provides a powerful support for exploring the theory of inducing slurry directional permeation.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top plan view of the top cover of the present invention;
FIG. 3 is a top plan view of the bottom cover of the present invention;
FIG. 4 is a detailed schematic view of the hollow screw interfaces of the present invention;
FIG. 5 is a schematic diagram of the connection between the induction hole and the drain pipe according to the present invention;
FIG. 6 is a detailed schematic view of the water pumping tube of the present invention;
FIG. 7 is a schematic illustration of an induced penetration grouting test method of the present invention;
wherein: 1-1: top cap, 1-2: grouting holes, 1-3: induction hole, 1-4: long hollow screw, 1-4-1: long hollow screw matched nut, 1-4-2: hollow screw bayonet, 1-4-3: hollow screw thread, 1-5: water inlet hole, 1-6: short hollow screw, 1-7: bottom filter screen, 1-8: bottom cover, 1-9: sealing ring, 1-10: top cap seal hole, 1-11: top cap seal screw and nut, 1-12: bottom cover seal hole, 1-13: bottom cover sealing screw rod and nut, 2-1: total grouting pipe, 2-2: tee joint, 2-3: grouting pipe I, 2-4: grouting pipe II, 2-5: microinjection pump, 2-6: injection tube I, 2-7: injection tube II, 3-1: drain pipe, 3-2: water stop clamp, 3-3: four-way, 3-4: total drain pipe, 3-5: suction pump, 3-6: water delivery pipe, 3-7: pumping pipe, 3-8: filter screen, 3-9: pumping hole, 4-1: water supply pipe, 4-2: water feeding pump, 4-3: inlet tube, 5-1: water storage bucket, 6-1: gamma camera, 6-2: display screen, 7: test tray, 7-1: sand-clay was sampled.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1 and 2, the top cover 1-1 is made of organic glass material into a circular disc with diameter of phi 260mm (i.e. diameter of 260mm and height of 10 mm), a grouting hole 1-2 with diameter of phi 15mm is drilled at the center of the circle, and a hollow screw with connecting length of phi 8mm (i.e. diameter of 8mm and length of 30 mm) is connected. Drilling a first induction hole 20mm away from the grouting hole transversely; and a second induction hole is drilled at a position 20mm away from the first induction hole transversely. The first and second guiding holes are drilled with third and fourth guiding holes at a position which rotates 45 degrees by taking the center of the top cover as the center, the third and fourth guiding holes are drilled with fifth and sixth guiding holes at a position which rotates 45 degrees by taking the center of the top cover as the center, the diameters of the guiding holes are phi 15mm, the lower surface of the top cover is provided with an annular groove with phi 190 x 170 x 5mm (namely, the diameter of the outer circle is 190mm, the diameter of the inner circle is 170mm and the depth is 5 mm), a rubber sealing ring 1-9 is arranged in the annular groove, the top cover 1-1 is overlapped above the test disc 7, and the rubber sealing ring 1-9 is arranged between the annular groove and the top cover. And a top cover sealing hole 1-10 with the diameter of 20mm is drilled in the four forward directions at the position 110mm away from the center of the top cover, and is sealed and fixed with the test disc 7 by a sealing screw and a nut 1-11.
As shown in fig. 1 and 3, the bottom covers 1-8 are fabricated from plexiglas material into discs of Φ260 x 30mm (i.e. 260mm diameter and 30mm height). Punching an inclined hole from the side face of the bottom cover to the center of the top face: the diameter of the straight section of the inclined hole is 20mm, and the length is 70mm; the diameter of the inclined straight section is 20mm, the inclined straight section is connected with the vertical section, the length of the vertical section is 5mm, the vertical section is used for placing the short hollow screw 1-6, and the inclined hole is used for penetrating out the water supply pipe 4-1. The water supply pipe 4-1 is connected with the water supply pump 4-2, the water inlet pipe 4-3 and the water storage barrel 5-1. And a top cover sealing hole 1-12 with the diameter of 20mm is drilled in the upper, lower, left and right directions at a position 110mm away from the center of the bottom cover, and is sealed and fixed with the test disc 7 by a sealing screw and a nut 1-11.
As shown in fig. 1 and 4, a long hollow screw connected with the induction hole 1-3 is connected with a drain pipe 3-1, and is respectively combined into a total drain pipe 3-4 by utilizing two four-way joints 3-3 and a three-way joint, and then is connected with a water suction pump 3-5, a water delivery pipe 3-6 and a water storage barrel 5-1. A water stop clamp 3-2 is arranged on the drain pipe 3-1.
As shown in figures 1 and 5, a filter screen 3-8 is arranged outside the water pumping pipe 3-7 to prevent soil from infiltration, and water pumping holes 3-9 with the diameter of 10mm are uniformly distributed on the water pumping pipe 3-7.
As shown in fig. 1 and 6, the hollow screw is made of stainless steel materials, and the connection parts of the long hollow screw and the short hollow screw with various pipes are respectively in the structure shown in fig. 6. The long hollow screw matched nut 1-4-1 is in a truncated cone shape, the diameter of the upper part is 6mm, the diameter of the lower part is 8mm, threads are formed, and the hollow screw threads 1-4-3 are matched with the nut threads. The hollow screw bayonet 1-4-2 at the middle position is used for preventing the pipe from falling off and ensuring good sealing performance.
As shown in FIG. 1, the top cover sealing screw and the nut 1-11 and the bottom cover sealing screw and the nut 1-13 are all phi 18mm high-strength screws.
As shown in fig. 1, the upper open reinforced test chamber of the test disc 7 is a cylinder made of organic glass material and having a diameter of phi 200 x 190 x 100mm (i.e. an outer circle diameter of 200mm, an inner circle diameter of 190mm and a height of 100 mm), and a top part is a ring made of organic glass material and having a diameter of phi 260 x 200 x 10 (i.e. an outer circle diameter of 260mm, an inner circle diameter of 200mm and a height of 10 mm) bonded by glass cement. The center of the bottom of the test tray is drilled with a water feeding hole 1-5 with the diameter phi of 15mm, and a bottom filter screen 1-7 is paved at the bottom of the test tray.
As shown in FIG. 1, the grouting pump 2-5 is a medical micro injection pump, which is provided with two injection pipes I2-6 and II 2-7, which are respectively connected with the grouting pipe I2-3 and II 2-4, and then the total grouting pipe 2-1 is synthesized by using a tee joint.
As shown in FIG. 1, a gamma camera 6-1 is provided with a probe and an electronic circuit, and a display screen 6-2 consists of an oscilloscope and a camera. The gamma camera contains a probe and electronics. The probe includes a collimator, scintillation crystal, phosphor screen, etc., which receives gamma rays. The oxygen-15 slurry enters the soil body to decay to emit positrons, and is annihilated with negative electrons in the soil body to be converted into a pair of gamma photons, and emitted gamma rays can be received by the scintillation crystal. The display screen consists of an oscilloscope and a camera, the camera can be aimed at the oscilloscope to shoot, and the display system is realized by the display of a microcomputer at present.
As shown in fig. 1 to 7, the method for performing the test by using the isotope labeling technology-based induced penetration grouting test system comprises the following steps:
step 1): the bottom of the test disc 7 is connected with a water feeding pipe 4-1 with a water stop clamp 3-2, a sealing screw 1-13 is used for fixing a bottom cover 1-8, the water feeding pipe 4-1 is led out from the bottom cover 1-8, and then a water inlet pump 4-2, a water inlet pipe 4-3 and a water storage barrel 5-1 are connected in sequence. The weight ratio is as follows: 1 proportion evenly mixes sand and soil in natural state to prepare the injected medium simulated soil sample 7-1. With the water inlet holes 1-5 closed, the simulated soil sample 7-1 was loaded into the test tray 7 and compacted.
Step 2): the grouting holes 1-2 are connected with a total grouting pipe 2-1 and a microinjection pump 2-5 through hollow screws 1-4. The microinjection pump 2-5 is provided with two injection pipes, the injection pipes I2-6 are filled with prepared slurry, and the injection pipes II 2-7 are temporarily placed with common water. The injection pipes I and II are connected with the grouting pipe I2-3, and the grouting pipe II 2-4 is used for synthesizing the grouting pipe 2-1 by a tee joint. The hollow screw 1-4 is installed in the induction hole 1-3, the water pumping pipe 3-7 with the water pumping hole 3-9 of the filter screen 3-8 is connected at the lower end, the water draining pipe 3-1 with the water stopping clamp 3-2 is connected at the upper end, and the water pumping pump 3-5, the water conveying pipe 3-6 and the water storing barrel 5-1 are connected by utilizing the combination of two four-way pipes 3-3 and one three-way pipe into the total water draining pipe 3-4. A section of air is discharged in the drain pipe 3-1, and the top cover 1-1 is fixed by the sealing screw 1-11. After the device is assembled and air is discharged, the water inlet pump 4-2 is turned on, so that soil samples in the test disc 7 are saturated with water, and when the induced holes I-VI are seen to emit water, the soil samples are proved to be saturated with water.
Step 3): after the sample is saturated, the water inlet pump 4-2 is closed, the water stop clamp is closed, but the water inlet pipe 4-3 is still in water to form a liquid seal, so that air is prevented from entering. The water suction pump 3-5 is opened, at the moment, only the water suction pipe of one induction hole is opened, the rest water suction pipes are closed by using a water stopping clamp, and the water suction rate is 1mm 3 And/min, pumping water for 2min, and discharging the water into the water storage barrel 5-1, wherein the test disc has a certain pressure difference on the side with the induction hole and the side without the induction hole.
Step 4): the common cement paste is placed in the injection tube I2-6, the common water in the injection tube II 2-7 is replaced by oxygen-15 water, and the oxygen-15 water is prepared by using an on-line oxygen-15 synthesizing device in the prior art Chinese patent. Oxygen-15 is a radioisotope of oxygen, the content used in this test is extremely low, and the half-life of oxygen-15 is short, poses little threat to human health, and does not affect the properties of the slurry.
Step 5): the test device is placed under a gamma camera 6-1, a microinjection pump 2-5 is turned on, the grouting pressure is constant, and grouting is continued for one minute. At the same time as grouting, the display 6-2 can be imaged in real time, tracking the slurry containing the oxygen-15 isotope toward, which is representative of the direction of slurry penetration.
Step 6): after the test is finished, taking out the soil sample, and mixing the soil according to the same sand-mud ratio. Under the condition of the same other conditions, the positions of the induction holes are changed, any other induction hole is selected, and the steps 2) to 5) are repeated.
Step 7): after the step is finished, different induction hole combinations are selected under the condition of the same other conditions, and the steps 2) to 5) are repeated.
Step 8): after the test is finished, taking out the soil sample, and changing the proportion of sand to soil into 5:1, compacting. And (3) repeating the steps 2) to 7) under the condition of the same other conditions.
Step 9): after the test is completed, at least 3 groups of tests are repeated, and the test results scanned at the positions of the induced holes with different sand-cement ratios under the same grouting time and the same grouting pressure are compared, so that the movement rule of the induced slurry directional infiltration grouting can be obtained.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (6)
1. The device is characterized by comprising an induced permeation grouting device and a real-time isotope monitoring device arranged on one side of the induced permeation grouting device; the device comprises a cylindrical transparent test disc with an opening at the upper part, an upper water hole is formed in the center of the bottom of the transparent test disc, the edges of the upper end and the lower end of the transparent test disc extend outwards horizontally to form annular extending parts, the upper annular extending parts and the lower annular extending parts of the transparent test disc are fixedly connected with a top cover and a bottom cover respectively through connecting pieces, an inclined channel is formed in the bottom cover, one end of the channel is upwards communicated with the upper water hole of the transparent test disc, and the other end of the channel extends to the side surface of the bottom cover and is connected with a water inlet and outlet device through a water inlet pipe;
the center of the top cover is provided with a grouting hole, three groups of induction holes are radially arranged outside the grouting hole, an included angle between radial lines penetrated by two adjacent groups of induction holes is 45 degrees, and the grouting hole is connected with the microinjection pump through a grouting pipe; the outside of the three groups of induced holes is connected with a water inlet and outlet device through a drain pipe, the lower parts of the three groups of induced holes are connected with a water pumping pipe extending to the inner bottom of the transparent test disc, the pipe wall of the water pumping pipe is provided with a plurality of water pumping holes communicated with the inner cavity of the water pumping pipe, and the outside of the water pumping pipe is provided with a filter screen for preventing a sample from blocking the pipeline;
a layer of filter screen is paved on the inner bottom of the test disc, so that a sample is fixed, and the sample is prevented from blocking a water supply pipeline;
each group of the induction holes comprises two through holes on the same radial line, the two through holes and the grouting hole are on the same radial line, and the center distance between the two through holes is equal to the center distance between the grouting hole and the nearest through hole;
each induction hole is provided with a hollow screw which penetrates through the whole body in a sealing way through glass cement, the lower part of the hollow screw is connected with a water suction pipe positioned in the transparent test disc, the upper part of the hollow screw is connected with a water discharge pipe, and the tail ends of a plurality of parallel water discharge pipes are combined and connected together through a communication valve to form a water discharge pipe connected with a water inlet and outlet device;
the upper water hole is sealed with a hollow screw which penetrates through the whole body through glass cement, and the hollow screw is communicated with a water inlet pipe inserted into the channel;
the water inlet and outlet device comprises a water storage barrel which is respectively connected with two water pumps through two different pipelines, wherein one water pump is a water inlet pump which is communicated with the water inlet pipe, and the other water pump is a water suction pump which is communicated with the water outlet pipe; and the water stop clamps are arranged on the water inlet pipe and the water outlet pipe.
2. The isotope labeling technique-based induced penetration grouting test device according to claim 1, wherein an annular groove is formed in the lower surface of the top cover corresponding to the upper annular extension portion of the transparent test disc, and a rubber sealing ring is placed in the annular groove.
3. The isotope tracking technology-based induced penetration grouting test device according to claim 1, wherein connecting holes are formed in the positions, corresponding to the upper annular extension part, the lower annular extension part, the top cover and the bottom cover, of the transparent test disc, the upper annular extension part, the lower annular extension part, the top cover and the bottom cover are correspondingly connected together through the connecting holes by a connecting piece to form a whole, and the connecting piece is a sealing screw.
4. The isotope tracking technology-based induced penetration grouting test device according to claim 1, wherein the microinjection pump is internally provided with two independent injection pipes, the prepared slurry is placed in one injection pump, the marked oxygen-15 water is placed in the other injection pipe, the two injection pipes are respectively and correspondingly connected with two different infusion pipes, the tail ends of the two infusion pipes form a grouting pipe by using a tee joint, and the grouting pipe is connected with a grouting hole by using a hollow screw; the hollow screw is sealed and installed in the grouting hole through glass cement.
5. The isotope labeling technique-based induced penetration grouting test device according to claim 1, wherein the real-time isotope monitoring device comprises a display screen to which a gamma camera is connected.
6. The isotope tracking technology-based induced penetration grouting test method is characterized by comprising the following steps of:
1): connecting the bottom of the test disc with a water inlet pipe with a water stop clamp, fixing the bottom cover by using a sealing screw rod, guiding the water inlet pipe out of the bottom cover, and sequentially connecting a water inlet pump and a water storage barrel; uniformly mixing sand and soil in a natural state according to a preset proportion, preparing a simulated soil sample of an injected medium, loading the simulated soil sample into a test disc in a state that an upper water hole is closed, and compacting;
2): the grouting holes are connected with a grouting pipe and a microinjection pump through hollow screws; the microinjection pump is provided with two injection pipes, wherein one injection pipe is filled with prepared slurry, and the other injection pipe is temporarily filled with common water; two injection pipes are respectively connected with one section of grouting pipe and then a tee joint is used for synthesizing a total grouting pipe; the hollow screw is arranged in the induction hole, the lower end of the hollow screw is connected with a porous water suction pipe with a filter screen, the upper end of the hollow screw is connected with a drain pipe with a water stop clamp, and a total drain pipe is synthesized by a communication valve and then connected with a water suction pump and a water storage barrel; a section of air is discharged in the drain pipe, and the top cover is fixed by a sealing screw rod; after the device is assembled and air is discharged, a water inlet pump is started to saturate soil samples in the test disc, and when water is seen to emerge from the induction hole, the soil samples are fully saturated;
3): after the sample is saturated, the water inlet pump is closed, the water stop clamp is closed, the water inlet pipe is still in water, a liquid seal is formed, and air is prevented from entering; the water suction pump is started, at the moment, only the water suction pipe and the water discharge pipe of one induction hole are opened, the rest water suction pipes are closed by the water stop clamp, water is pumped, the water is discharged into the water storage barrel, and at the moment, a certain pressure difference exists between the side with the induction hole and the side without the induction hole of the test disc;
4): replacing the common water in the injection tube with oxygen-15 water;
5): placing the test device under a gamma camera, opening a microinjection pump, keeping grouting pressure constant, and continuously grouting for one minute; at the same time of grouting, the display screen can image in real time, and track the forward direction of the slurry containing the oxygen-15 isotope, which represents the permeation direction of the slurry;
6): after the test is finished, taking out the soil sample, and preparing soil according to the same sand-mud ratio; under the condition of the same other conditions, changing the positions of the induction holes, selecting another induction hole, and repeating the steps 2) to 5) until all the induction holes are tested;
7): after the step is finished, selecting different induction hole combinations under the condition of the same other conditions, and repeating the steps 2) to 5);
8): taking out the soil sample after the test is finished, changing the proportion of a preset soil sample, and compacting; repeating steps 2) to 7) under the condition of the same other conditions;
9): after the test is completed, repeating at least 3 groups of tests, and comparing the test results scanned by the same grouting time and the same grouting pressure at different soil sample sand-cement ratios and different induced holes to obtain the movement rule of induced slurry directional penetration grouting.
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