Eicp combined with polymer reinforced soil sample preparation and performance testing device and method of using same

Abstract

The application belongs to the technical field of reinforced soil sample preparation and performance testing, and provides an EICP combined polymer reinforced soil sample preparation and performance testing device and a use method thereof. The EICP combined polymer reinforced soil sample preparation and performance testing device comprises a testing device body and a reinforced soil sample preparation mold. The top end of the testing device body is provided with a flip cover, the bottom surface of the flip cover is provided with a 3D scanner, the top end of the testing device body is also provided with a spraying shower, one group of opposite side walls of the testing device body is provided with a blower, and the other group of opposite side walls of the testing device body is provided with a baking lamp. The bottom end of the testing device body is provided with a water tank, a water tank lifter and an electronic scale. The bottom of the water tank is connected with the water tank lifter, and the electronic scale is placed below the water tank. The water tank is provided with a soil sample lifter. The top of the soil sample lifter is provided with a test soil sample, and the bottom of the soil sample lifter is fixedly connected with the water tank. The application can prepare a reinforced soil sample and test multiple performances of the reinforced soil.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reinforced soil sample preparation and performance testing, and particularly relates to an EICP combined polymer reinforced soil sample preparation and performance testing device and a use method thereof. BACKGROUND

[0002] In recent years, the technology of reinforcing soil based on microorganisms has attracted widespread attention. At present, this technology mainly includes two directions: one is the direct cultivation of microorganisms to induce calcium carbonate precipitation technology (MICP), and the principle is to catalyze the decomposition of urea by urease, to generate CO3 2- ions combined with Ca 2+ ions in anhydrous calcium chloride, and CaCO3 crystals are formed around the microorganisms. The other direction is to directly use urease to induce calcium carbonate precipitation (EICP). However, due to the lack of microbial cells as a template, calcium carbonate precipitation is not easy to aggregate, so the size of the generated calcium carbonate crystals is small. Researchers have tried to introduce different polymer materials to solve this defect. It is found that the combination of skimmed milk powder and EICP reinforced soil technology can improve the adhesion of precipitated carbonate and improve the strength of the treated soil; the introduction of hydrogel materials such as xanthan gum to assist urease to induce calcium carbonate precipitation is found to be able to keep water for a long time, prolong the reaction time, and improve the precipitation rate of carbonate. High molecular materials such as cellulose, glutinous rice syrup, chitosan, and lignin can improve the defects of traditional EICP to different extents.

[0003] At present, the experimental research on EICP combined with polymer materials mainly focuses on the strength, and the research on the erosion resistance of reinforced sand, the deformation of reinforced clay, and the water stability of the two under dry-wet cycles is not perfect. SUMMARY

[0004] In order to solve the problems in the prior art, the application provides an EICP combined polymer reinforced soil sample preparation and performance testing device and a use method thereof. The device can be used for reinforced soil sample preparation, reinforced sand anti-wind erosion test, reinforced sand anti-rain erosion test, reinforced sand water stability test, reinforced clay deformation measurement test, and reinforced clay water stability test, so as to more comprehensively evaluate the performance of the reinforced soil.

[0005] The application adopts the following technical solutions.

[0006] In one aspect, the present application provides an EICP combined with polymer reinforced soil sample preparation and performance testing device, including test device body and reinforced soil sample preparation mold, the top of the test device body is provided with a flip, the bottom surface of the flip is installed with a 3D scanner, the top of the test device body is also provided with a spray shower, a group of opposite side walls of the test device body is provided with a hair dryer, another group of opposite side walls of the test device body is provided with a baking lamp;

[0007] The bottom end of the test device body is provided with a water tank, a water tank lifter and an electronic scale, the bottom of the water tank is connected with the water tank lifter, and the electronic scale is placed below the water tank; a soil sample lifter is arranged in the water tank, the top of the soil sample lifter is placed with a test soil sample, and the bottom of the soil sample lifter is fixedly connected with the water tank; the water tank and the two sides of the test device body are provided with water inlets, one side of the water inlets is connected with a first water inlet pipe, the other side of the water inlets is connected with a second water inlet pipe, one end of the first water inlet pipe is connected with a reaction liquid device, and one end of the second water inlet pipe is connected with a liquid storage tank; the reaction liquid device comprises a first reaction liquid container and a second reaction liquid container, the first reaction container is filled with urease solution, and the second reaction liquid container is filled with a mixed solution of cementing liquid and high molecular material; the liquid storage tank is filled with pure water;

[0008] The EICP combined with polymer reinforced soil sample preparation and performance testing device further comprises a suction sensor, a displacement sensor and a Shore strength meter, the suction sensor is arranged at the top of the test device body and above the test soil sample, the displacement sensor is installed on the four side walls of the test device body, and the displacement sensors are uniformly distributed around the test soil sample, and the Shore strength meter is placed on the surface of the test soil sample;

[0009] The reinforced soil sample preparation mold comprises a detachable shell, a geotextile and a water permeable stone, the geotextile is laid on the inner wall of the detachable shell, and the assembled detachable shell is opened at the top and placed with the water permeable stone at the bottom.

[0010] Further, the first water inlet pipe is connected with the first reaction liquid container and the second reaction liquid container through a T-shaped three-way valve; the first water inlet pipe and the second water inlet pipe are further provided with an air pump for conveying reaction liquid.

[0011] In the mixed solution of the cementing liquid and the high molecular material, the high molecular material is cellulose, the cementing liquid comprises urea solution and calcium chloride solution, the cementing liquid is 1mol / L, and the ratio of the cementing liquid to the cellulose is 1:1.

[0012] Further, the EICP combined with polymer reinforced soil sample preparation and performance testing device further comprises an information collector and a computer, the information collector and the 3D scanner are connected with the computer, the information collector is connected with the displacement sensor, the Shore strength meter and the suction force sensor, for receiving the displacement information of the test soil sample, the surface strength information of the test soil sample and the surface suction force information of the test soil sample, and transmitting the information to the computer.

[0013] In another aspect, the present application provides a use method of an EICP combined with polymer reinforced soil sample preparation and performance testing device, which is applied to the above-mentioned EICP combined with polymer reinforced soil sample preparation and performance testing device, and the use method of the EICP combined with polymer reinforced soil sample preparation and performance testing device for soil sample preparation comprises the following steps:

[0014] S1: lay geotextile on the inner wall of the assembled detachable shell, and put the water permeable stones into the bottom of the detachable shell;

[0015] S2: put a certain amount of sandy soil or cohesive soil and compact it in layers, and read the electronic scale reading m1;

[0016] S3: open the air pump on the first water inlet pipe, urease solution flows into the water tank through the first water inlet pipe, control the soil sample lifter and the test soil sample thereon to descend and soak for 12h;

[0017] S4: draw the urease solution in the water tank back to the first reaction liquid container through the air pump on the first water inlet pipe, then open the air pump on the first water inlet pipe, and the mixed solution of cementing liquid and polymer material flows into the water tank, control the soil sample lifter and the test soil sample thereon to descend and soak for 12h;

[0018] S5: control the soil sample lifter to rise, draw the mixed solution of cementing liquid and polymer material in the water tank back to the second reaction liquid container through the air pump on the first water inlet pipe, and weigh the weight m2;

[0019] S6: repeat steps S3-S5 until the difference of the weight of two consecutive times is less than 1%, the test soil sample preparation is completed, the prepared test soil sample is demolded, and the weight of the test soil sample is m3.

[0020] Further, the use method of the EICP combined with polymer reinforced soil sample preparation and performance testing device for reinforced sandy soil wind erosion test comprises:

[0021] After the demolded sandy soil test soil sample is placed on the soil sample lifter, the air blower is opened and the wind power level of the air blower is set to n, the blowing time is t1, after blowing, the weight of the test soil sample is weighed again as m4, and the surface of the test soil sample after the test is scanned by the 3D scanner, the surface erosion of the test soil sample is observed, and the wind erosion amount E and the erosion rate V are calculated according to the mass difference before and after and the blowing time. E;

[0022] E = m3-m4

[0023]

[0024] Further, the use method of the EICP combined with the polymer reinforced soil sample preparation and performance testing device for the rain erosion test of the reinforced sand soil comprises:

[0025] After the demolding of the sand soil test sample, the sand soil test sample is placed on the soil sample lifter, the spray shower is opened and the water output is set as W, the spraying time is set as t2, after the spraying is completed, the baking lamp is opened and the temperature is set as T0, the test soil sample is dried and weighed to obtain the weight m5, the surface of the test soil sample is scanned by the 3D scanner, the surface erosion of the test soil sample is observed, and the rain erosion amount D and the erosion rate V are calculated according to the mass difference before and after and the rain time D ;

[0026] D = m3-m5

[0027]

[0028] Further, the use method of the EICP combined with the polymer reinforced soil sample preparation and performance testing device for the water stability test of the reinforced sand soil comprises:

[0029] After the demolding of the sand soil test sample, the sand soil test sample is placed on the soil sample lifter, the spray shower is opened and the water output is set as W, the spraying time is set as t2, after the spraying is completed, the baking lamp is opened and the temperature is set as T0, the test soil sample is dried and weighed to obtain the weight m5, the surface of the test soil sample is scanned by the 3D scanner, the surface erosion of the test soil sample is observed, and the rain erosion amount D and the erosion rate V are calculated according to the mass difference before and after and the rain time

[0030]

[0031] Further, the use method of the EICP combined with the polymer reinforced soil sample preparation and performance testing device for the deformation measurement test of the reinforced clay soil comprises:

[0032] After the demolding of the clay soil test sample, the clay soil test sample is placed on the soil sample lifter, the displacement sensor is used to measure the average displacement of the four sides of the test soil sample as L, and the original height of the test soil sample is measured by a ruler as h.

[0033] The pure water is filled in the water tank, the test soil sample is introduced into the water through the soil sample lifter, the soaking time is t3, after the soaking is completed, the soil sample lifter is lifted and the water in the water tank is emptied, the baking lamp is opened and the temperature is set to T0, the test soil sample is dried, the average value of the deformation displacement of the test soil sample is recorded as L', the height of the test soil sample is measured as h' by using a ruler, the original volume V1 and the changed volume V2 of the test soil sample are calculated, and the free swelling rate δ is calculated.

[0034]

[0035] Further, the use method of the EICP combined with the polymer reinforced soil sample preparation and performance testing device for the water stability test of the reinforced cohesive soil comprises:

[0036] The demolded cohesive soil test sample is placed on the soil sample lifter, and the surface of the test soil sample is photographed by using a 3D scanner to obtain the area A of the test soil sample, pure water is filled in the water tank, the test soil sample on the soil sample lifter is soaked in water by controlling the soil sample lifter, the soaking time is t3, after the soaking is completed, the soil sample lifter is lifted and the water in the water tank is emptied, and the weight m7 of the soil sample after soaking is recorded, the baking lamp is opened and the temperature is set to T0, the test soil sample starts to be dried, the weight of the test soil sample is recorded every 10 minutes, and when the difference between the two consecutive weights is not more than 0.1%, the weight m8 of the test soil sample is obtained, and the suction M of the soil surface at different times is tested by using a suction sensor c , the water content ω is calculated according to the mass, the water and soil conservation performance of the test soil sample is judged by drawing the water content-suction relationship curve under the dry-wet cycle, the surface of the soil body is photographed by using the 3D scanner 7, the data scanned by the 3D scanner is modeled and the area A ′ of the soil body surface without cracks is identified, and the cracking degree of the soil body can be represented as the crack rate μ:

[0037]

[0038] The beneficial effects of the present application are that, compared with the prior art:

[0039] 1. The device provided by the present application integrates reinforced soil sample preparation and test soil sample performance testing, simplifies the cumbersome process of traditional soil sample preparation and testing, and improves work efficiency.

[0040] 2. The device provided by the present application can perform reinforced sand soil wind erosion resistance test, reinforced sand soil rain erosion resistance test, reinforced sand soil water stability test, reinforced cohesive soil deformation measurement test and reinforced cohesive soil water stability test, so as to more comprehensively evaluate the stability of reinforced soil of different soil quality under various environmental conditions. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1It is the structural schematic view of the EICP combined with polymer reinforced soil sample preparation and performance testing device provided by the application.

[0042] Figure 2 It is the front view of the EICP combined with polymer reinforced soil sample preparation and performance testing device provided by the application.

[0043] Figure 3 It is the connection relationship structural schematic view of the water tank, water tank lifter, soil sample lifter and electronic scale.

[0044] Figure 4 It is the front view of the connection relationship of the water tank, water tank lifter, soil sample lifter and electronic scale.

[0045] Figure 5 It is the structural schematic view of the reinforced soil sample preparation mold.

[0046] In the figure: 1-test device body; 2-water tank; 3-soil sample lifter; 301-load part; 302-lifting part; 303-fixing part; 4-water tank lifter; 5-electronic scale; 6-test soil sample; 7-3D scanner; 8-suction sensor; 9-sprinkling shower; 10-baking lamp; 11-blower; 12-Shore strength meter; 13-displacement sensor; 14-reaction liquid device; 15-first reaction liquid container; 16-second reaction liquid container; 17-liquid storage tank; 18-air pump; 19-dismountable shell; 20-geotextile; 21-permeable stone; 22-reinforced soil sample preparation mold; 23-information collector; 24-computer. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The embodiments described in the present application are only a part of the embodiments of the present application, but not all the embodiments. All other embodiments obtained by those skilled in the art without creative labor based on the spirit of the present application shall fall within the protection scope of the present application.

[0048] As Figures 1-2 shown, the present application provides an EICP combined with polymer reinforced soil sample preparation and performance testing device, which comprises a test device body 1 and a reinforced soil sample preparation mold 22. The top end of the test device body 1 is provided with a flip cover, and a 3D scanner 7 is installed on the bottom surface of the flip cover. The operator can operate by reaching into the test device body 1 through the flip cover. The top end of the test device body 1 is also provided with a sprinkling shower 9, and the number of the sprinkling shower 9 is two and is arranged on both sides of the flip cover. A blower 11 is arranged on one group of opposite side walls of the test device body 1, and a baking lamp 10 is arranged on the other group of opposite side walls of the test device body 1.

[0049] The test device body 1 is also provided with a suction sensor 8, a displacement sensor 13 and a Shore strength meter 12. The suction sensor 8 is located above the test soil sample 6. The displacement sensor 13 is provided on the four side walls of the test device body 1 and is uniformly distributed around the test soil sample 6. The Shore strength meter 12 is placed on the surface of the test soil sample 6.

[0050] As shown in Figures 3-4 The bottom end of the test device body 1 is provided with a water tank 2. The water tank 2 is provided with a soil sample lifter 3. The test soil sample 6 is placed on the top of the soil sample lifter 3. The bottom of the soil sample lifter 3 is fixedly connected with the water tank 2. The connection between the soil sample lifter 3 and the water tank 2 is sealed. The soil sample lifter 3 includes a fixed part 303, a lifting part 302 and a carrying part 301. The fixed part 303 is connected with the bottom of the water tank 2 and is used to fix the soil sample lifter 3 in the water tank 2. The lifting part 302 is used for lifting the soil sample lifter 3. The carrying part 301 is used to place the test soil sample 6. The carrying part 301, the lifting part 302 and the fixed part 303 are connected in sequence from top to bottom. In some embodiments, the fixed part 303 of the soil sample lifter 3 is a base. The lifting part 302 is a telescopic air cylinder. The carrying part 301 is a lifting workbench. The rear end cover of the telescopic air cylinder is fixedly connected with the top surface of the fixed part 303. The piston rod of the telescopic air cylinder is fixedly connected with the bottom surface of the carrying part 301. The lifting movement of the lifting part 302 is realized by controlling the extension and retraction of the telescopic air cylinder.

[0051] The water tank 2 is placed on the workbench of the water tank lifter 4. The water tank lifter 4 drives the water tank 2 to rise or fall, so that the water tank 2 is completely placed on the electronic scale 5 or away from the electronic scale 5. The water tank lifter 4 can be a screw lifter. The worm is driven to rotate by the motor. The worm drives the worm gear to rotate at a reduced speed. The inner cavity of the worm gear is processed into internal threads. The lead screw moves up and down. In some embodiments, the water tank lifter 4 is a hand-operated screw lifter. The lead screw moves up and down by manually rotating the hand wheel, thereby realizing the lifting function. The water tank 2 can be lifted to different heights by the water tank lifter 4, thereby meeting the requirements of different performance test experiments.

[0052] The water tank 2 and the two sides of the test device body 1 are provided with water inlets, one side of which is connected with the first water inlet pipe, and the other side is connected with the second water inlet pipe. One end of the first water inlet pipe is connected with the reaction liquid device 14, and the reaction liquid device 14 includes a first reaction liquid container 15 and a second reaction liquid container 16, the first reaction liquid container 15 is filled with urease solution, and the second reaction liquid container 16 is filled with mixed solution of cementing liquid and polymer material, and the first water inlet pipe is connected with the two reaction liquid containers through a T-shaped three-way valve. One end of the second water inlet pipe is connected with the liquid storage tank 17, and the liquid storage tank 17 is filled with pure water. The first water inlet pipe and the second water inlet pipe are both provided with an air pump 18, which is used for conveying liquid.

[0053] As shown in Figure 5 The reinforced soil sample preparation mold 22 includes a detachable shell 19, a geotextile 20 and a permeable stone 21. The inner wall of the detachable shell 19 is paved with the geotextile 20, and the assembled detachable shell 19 is opened at the top and placed with the permeable stone 21 at the bottom.

[0054] The EICP combined with the polymer reinforced soil sample preparation and performance testing device further includes an information collector 23 and a computer 24, the information collector 23 and the 3D scanner 7 are connected with the computer 24, the information collector 23 is connected with the displacement sensor 13, the Shore strength meter 12 and the suction force sensor 8, used for receiving the displacement information of the test soil sample 6, the surface strength information of the test soil sample and the surface suction force information of the test soil sample, and transmitting the information to the computer 24. The computer 24 receives the displacement information of the test soil sample, and calculates the free swelling rate according to the displacement information of the test soil sample and the height information of the test soil sample. The computer 24 receives the surface strength information of the test soil sample, and calculates the immersion strength loss rate λ of the test soil sample according to the strength information. The computer 24 receives the surface suction force information of the test soil sample in the water stability test, and calculates the water content and draws the water content-suction force relationship curve according to the weight change and suction force change of the test soil sample in the water stability test. The computer 24 receives the surface data information of the test soil sample transmitted by the 3D scanner, models and identifies the crack area of the test soil sample surface, and calculates the crack rate of the test soil sample.

[0055] In addition, the present application also provides a use method of the EICP combined with the polymer reinforced soil sample preparation and performance testing device, which can be used for reinforced soil sample preparation, reinforced sand soil wind erosion resistance test, reinforced sand soil rain erosion resistance test, reinforced sand soil water stability test, reinforced clay deformation measurement test and reinforced clay water stability test.

[0056] When the EICP combined with the polymer reinforced soil sample preparation and performance testing device is used as a reinforced soil sample preparation, the use method includes:

[0057] S1: Lay the geotextile 20 on the inner wall of the assembled detachable shell 19, and put the water permeable stones 21 into the bottom of the detachable shell 19;

[0058] S2: Put a certain amount of sandy soil or cohesive soil and compact it in layers, and read the reading m1 of the electronic scale 5;

[0059] S3: Open the air pump 18 on the first water inlet pipe, and the urease solution flows into the water tank through the first water inlet pipe, control the soil sample lifter 3 and the test soil sample 6 on it to descend and soak for 12h;

[0060] S4: The urease solution in the water tank 2 is pumped back to the first reaction liquid container 15 through the air pump 18 on the first water inlet pipe, and then the mixed solution of cementing liquid and high polymer material is flowed into the water tank 2 through the air pump 18 on the first water inlet pipe, and the soil sample lifter 3 and the test soil sample 6 on it are controlled to descend and soak for 12h;

[0061] S5: Control the soil sample lifter 3 to rise, and the mixed solution of cementing liquid and high polymer material in the water tank 2 is pumped back to the second reaction liquid container 16 through the air pump 18 on the first water inlet pipe, and the weight m2 is weighed;

[0062] S6: Repeat steps S3-S5 until the difference between two consecutive weighings is less than 1%, and the test soil sample 6 is prepared, and the prepared test soil sample 6 is demolded to obtain the weight of the test soil sample 6 as m3.

[0063] In a preferred but non-limiting embodiment, the high polymer material uses cellulose, the cementing liquid includes urea solution and calcium chloride solution, the cementing liquid is 1mol / L, and the ratio of the cementing liquid to the cellulose is 1:1. The preparation process of the cementing liquid is: 1. Dissolve 110g of calcium chloride in 500ml of pure water; 2. Dissolve 60g of urea in 500ml of pure water; 3. Mix the two solutions together.

[0064] When the EICP combined with high polymer reinforced soil sample preparation and performance testing device is used for anti-wind erosion test of reinforced sandy soil, the use method includes:

[0065] After the demolded sandy soil test sample is placed on the soil sample lifter 3, the air blower 11 is turned on and the air blower is set to n, and the blowing time is t1, after blowing, the test soil sample weight is weighed again as m4, and the test soil sample 6 surface after test is scanned by the 3D scanner 7, the surface erosion of the test soil sample 6 is observed, and the wind erosion amount E and the erosion rate V are calculated according to the mass difference before and after and the blowing time E , record the erosion amount of the soil sample at intervals, and judge the anti-wind erosion performance of the test soil sample by drawing the erosion amount-time relationship curve;

[0066] E = m3-m4

[0067]

[0068] In a preferred but non-limiting embodiment, if the reinforced sand soil is tested for wind erosion resistance under light wind erosion conditions, the wind force level n is 5-10 m / s, if the reinforced sand soil is tested for wind erosion resistance under moderate wind erosion conditions, the wind force level n is 15-20 m / s, and if the reinforced sand soil is tested for wind erosion resistance under extreme wind erosion conditions, the wind force level n is 25-30 m / s. In the wind erosion resistance test, the blowing time of the blower is 10-20 minutes, the weight change of the soil sample is recorded every 2 minutes, and the weight change information of the soil sample is uploaded to the computer, and the computer draws the wind erosion rate-time curve under different wind erosion conditions.

[0069] When the EICP combined with the polymer reinforced soil sample preparation and performance testing device is used as a reinforced sand soil rain erosion resistance test, the use method includes:

[0070] After demolding, the sand soil test sample 6 is placed on the soil sample lifter 3, the spray shower 9 is opened and the water output is set to W, the spraying time is t2, after spraying, the baking lamp 10 is opened and the temperature is set to T0, the test sample 6 is dried and weighed to obtain the weight m5, and the surface of the test sample after the test is scanned by the 3D scanner 7, the surface erosion of the test sample 6 is observed, and the rain erosion amount D and the erosion rate V are calculated according to the mass difference before and after and the rain time D ; record the erosion amount of the soil sample at intervals, and judge the rain erosion resistance of the test soil sample by drawing the erosion amount-time relationship curve;

[0071] D = m3-m5

[0072]

[0073] In a preferred but non-limiting embodiment, if the reinforced sand soil is tested for rain erosion resistance under light rainfall conditions, the water output W is 10-20 liters per square meter per hour, if the reinforced sand soil is tested for rain erosion resistance under moderate rainfall conditions, the water output W is 30-50 liters per square meter per hour, and if the reinforced sand soil is tested for rain erosion resistance under extreme rainfall conditions, the water output W is 50 liters per square meter per hour. In the rain erosion resistance test, the spraying time of the spray shower is 10-20 minutes, the weight change of the soil sample is recorded every 2 minutes, and the weight change information of the soil sample is uploaded to the computer, and the computer draws the rain erosion rate-time curve under different rain erosion conditions.

[0074] When the EICP combined with the polymer reinforced soil sample preparation and performance testing device is used as a reinforced sand soil water stability test, the use method includes:

[0075] The demolded sandy soil test sample 6 is placed on the soil sample lifter 3, representative points are selected on the surface of the test sample 6, the surface strength P1 is recorded by the Shore strength meter 12, pure water is filled in the water tank 2, the test sample 6 is immersed in water through the soil sample lifter 3, the soaking time is t3, after the soaking is completed, the soil sample lifter 3 is lifted and the water in the water tank 2 is emptied, the baking lamp 10 is turned on and the temperature is set to T0, the test sample 6 is dried, and the weight of the dried test sample 6 is m6, the surface strength is P2; the mass loss ratio of the soil sample before and after immersion is the disintegration rate κ, the strength loss ratio before and after immersion is the immersion strength loss rate λ, the disintegration rate of the soil sample is recorded every certain time, and the water stability of the test soil sample is judged by drawing the disintegration rate-time relationship curve;

[0076]

[0077] When the EICP combined polymer reinforced soil sample preparation and performance testing device is used for reinforced cohesive soil deformation measurement test, the use method comprises:

[0078] The demolded cohesive soil test sample 6 is placed on the soil sample lifter 3, the average displacement of the test sample 6 around is measured by the displacement sensor 13, and the original height of the test sample 6 is measured by a ruler;

[0079] Pure water is filled in the water tank 2, the test sample 6 enters the water through the soil sample lifter 3, the soaking time is t3, after the soaking is completed, the soil sample lifter 3 is lifted and the water in the water tank 2 is emptied, the baking lamp 10 is turned on and the temperature is set to T0, the test sample 6 is dried, and the average deformation displacement of the test sample 6 is recorded as L', the height of the test sample is measured by a ruler as h'; the original volume V1 and the changed volume V2 of the test sample 6 are calculated, and the free swelling rate δ is calculated;

[0080]

[0081] When the EICP combined polymer reinforced soil sample preparation and performance testing device is used for reinforced cohesive soil water stability test, the use method comprises:

[0082] The demolded cohesive soil test sample 6 is placed on the soil sample lifter 3, and the surface of the test sample 6 is photographed by the 3D scanner 7 to obtain the area A of the test sample 6, pure water is filled in the water tank 2, the test sample 6 on the soil sample lifter 3 is immersed in water, the soaking time is t3, after the soaking is completed, the soil sample lifter 3 is lifted and the water in the water tank 2 is emptied, and the weight of the soaked soil sample m7 is recorded, the baking lamp 10 is turned on and the temperature is set to T0, the test sample 6 is started to be dried, the weight of the test sample 6 is recorded every 10 minutes, and when the difference between the two consecutive weights is not more than 0.1%, the weight m8 of the test sample 6 is obtained, and the suction force sensor 8 is used to test the suction force M of the soil surface at different timesc The water-soil conservation performance of the test soil sample 6 is determined by depicting the water content-suction relationship curve under the dry-wet cycle according to the quality calculation water content ω; the surface of the soil body is photographed by the 3D scanner 7, the data scanned by the 3D scanner is modeled and the area without cracks on the surface of the soil body is identified as A ′ The cracking degree of the soil body can be expressed as a crack rate μ, if the area with cracks is A"

[0083]

[0084] The water-soil conservation performance of the test soil sample 6 is determined by depicting the water content-suction relationship curve under the dry-wet cycle according to the quality calculation water content ω; the surface of the soil body is photographed by the 3D scanner 7, the data scanned by the 3D scanner is modeled and the area without cracks on the surface of the soil body is identified as A

[0085] In a preferred but non-limiting embodiment, the temperature T0 of the baking lamp is 70-90℃, and the soaking time t3 is 12-14 hours.

[0086] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can still be modified or replaced equivalently without departing from the spirit and scope of the present application, any modification or equivalent replacement thereof should be covered within the protection scope of the claims of the present application.

Claims

1. An EICP combined with polymer reinforced soil sample preparation and performance testing device, comprising a test device body and a reinforced soil sample preparation mold, characterized in that: The top of the test device body is provided with a flip cover, the bottom of the flip cover is provided with a 3D scanner, the top of the test device body is also provided with a spray shower, a hair dryer is provided on a set of opposite side walls of the test device body, and a heating lamp is provided on another set of opposite side walls of the test device body; A water tank, a water tank lifter and an electronic scale are provided at the bottom end of the test device body. The bottom of the water tank is connected to the water tank lifter, and the electronic scale is placed below the water tank; a soil sample lifter is provided in the water tank, a test soil sample is placed on the top of the soil sample lifter, and the bottom of the soil sample lifter is fixedly connected to the water tank; water inlets are provided on both sides of the water tank and the test device body, wherein the water inlet on one side is connected to the first water inlet pipe, and the water inlet on the other side is connected to the second water inlet pipe, one end of the first water inlet pipe is connected to the reaction liquid device, and one end of the second water inlet pipe is connected to the liquid storage tank, the reaction liquid device comprises a first reaction liquid container and a second reaction liquid container, the first reactor container is filled with urease solution, the second reaction liquid container is filled with a mixed solution of a binder and a polymer material, the polymer material is cellulose, the binder comprises a urea solution and a calcium chloride solution, and the liquid storage tank is filled with pure water; The EICP combined polymer reinforced soil sample preparation and performance testing device also includes a suction sensor, a displacement sensor and a Shore strength meter. The suction sensor is arranged at the top of the test device body and above the test soil sample. The displacement sensor is installed on the four side walls of the test device body and is evenly distributed around the test soil sample. The Shore strength meter is placed on the surface of the test soil sample. The reinforced soil sample mold includes a detachable shell, geotextile and permeable stone. The inner wall of the detachable shell is paved with geotextile. The assembled detachable shell has an opening on the top and permeable stone on the bottom.

2. The EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 1, characterized in that: The first water inlet pipe is connected to the first reaction liquid container and the second reaction liquid container through a T-shaped three-way valve; the first water inlet pipe and the second water inlet pipe are also provided with an air pump for conveying the reaction liquid.

3. The EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 2, characterized in that: In the mixed solution of the binder and the polymer material, the binder is 1 mol / L, and the ratio of the binder to the cellulose is 1:

1.

4. The EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 3, characterized in that: The EICP combined polymer reinforced soil sampling and performance testing device also includes an information collector and a computer. The information collector and the 3D scanner are connected to the computer. The information collector is connected to the displacement sensor, the Shore strength meter and the suction sensor, and is used to receive the displacement information of the test soil sample, the surface strength information of the test soil sample and the surface suction information of the test soil sample, and transmit the information to the computer.

5. A method for using an EICP combined with polymer reinforced soil sample preparation and performance testing device, applied to an EICP combined with polymer reinforced soil sample preparation and performance testing device according to any one of claims 1 to 4, characterized in that: The method for using the EICP combined with polymer reinforced soil sampling and performance testing device for reinforced soil sampling comprises the following steps: S1: Lay geotextile on the inner wall of the assembled removable shell and place permeable stone at the bottom of the removable shell; S2: Add a certain amount of sand or clay and compact it layer by layer, and read the electronic scale reading m1; S3: Turn on the air pump on the first water inlet pipe, and the urease solution flows into the water tank through the first water inlet pipe, and the soil sample lifter and the test soil sample thereon are controlled to descend and soak for 12 hours; S4: The urease solution in the water tank is pumped back into the first reaction liquid container through the air pump on the first water inlet pipe, and the air pump on the first water inlet pipe is turned on again, and the mixed solution of the binder and the polymer material flows into the water tank, and the soil sample elevator and the test soil sample thereon are controlled to descend and soak for 12 hours; S5: Control the soil sample lifter to rise, and pump the mixed solution of the binder liquid and the polymer material in the water tank back into the second reaction liquid container through the air pump on the first water inlet pipe, and weigh the weight m2; S6: Repeat steps S3-S5 until the difference between two consecutive weighings is less than 1%, and the test soil sample is prepared. The prepared test soil sample is demoulded to obtain a weight of m3 of the test soil sample.

6. The method for using the EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 5, characterized in that: The method of using the EICP combined with polymer reinforced soil sample preparation and performance testing device for reinforced sand anti-wind erosion testing includes: Place the demoulding sand soil sample on the soil sample lifter, turn on the hair dryer and set the wind force level of the hair dryer to n and the blowing time to t1. After the blowing is completed, weigh the test soil sample again to m4. Scan the surface of the test soil sample after the test with a 3D scanner to observe the surface erosion of the test soil sample. Calculate the wind erosion amount E and erosion rate V based on the weight difference before and after and the blowing time. E ; Record the amount of soil erosion at regular intervals, and determine the wind erosion resistance of the test soil sample by drawing an erosion amount-time relationship curve; E=m3-m4 7. The method for using the EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 6, characterized in that: The method of using the EICP combined with polymer reinforced soil sample preparation and performance testing device for the rain erosion resistance test of reinforced sand soil includes: Place the demoulding sand soil test sample on the soil sample lifter, turn on the spray shower and set the water output to W, the spraying time to t2, and after the spraying is completed, turn on the baking lamp and set the temperature to T0. Dry the test soil sample and weigh it to obtain a weight of m5. Scan the surface of the test soil sample with a 3D scanner to observe the surface erosion of the test soil sample. Calculate the rain erosion amount D and erosion rate V based on the weight difference before and after and the rain duration. D ; Record the amount of soil erosion at regular intervals, and determine the rain erosion resistance of the test soil sample by drawing an erosion amount-time relationship curve; D=m3-m5 8. The method for using the EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 7, characterized in that: The method of using the EICP combined with polymer reinforced soil sample preparation and performance testing device for reinforced sand water stability testing includes: The demoulding sand soil test sample is placed on a soil sample lifter, a representative point is selected on the surface of the test soil sample, and the surface strength P1 is recorded using a Shore strength meter. Pure water is filled in a water tank, and the test soil sample is immersed in the water through the soil sample lifter for a soaking time of t3. After the soaking is completed, the soil sample lifter is raised and the water in the water tank is drained. The drying lamp is turned on and the temperature is set to T0. The test soil sample is dried and weighed. The weight of the dried test soil sample is m6, and the surface strength is P2. The ratio of the mass loss of the soil sample before and after soaking is the disintegration rate κ, and the ratio of the strength loss before and after soaking is the soaking strength loss rate λ. The disintegration rate of the soil sample is recorded at regular intervals, and the water stability of the test soil sample is determined by drawing a disintegration rate-time relationship curve.

9. The method for using the EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 5, characterized in that: The use of the EICP combined with polymer reinforced soil sample preparation and performance testing device for reinforced clay soil deformation measurement tests includes: Place the demoulding clay soil test sample on the soil sample lifter, measure the average displacement of the four sides of the test soil sample using a displacement sensor as L, and measure the original height of the test soil sample with a ruler as h; Fill the water tank with pure water, place the test soil sample in the water through the soil sample lifter, and soak for t3. After soaking, raise the soil sample lifter and drain the water in the water tank. Turn on the drying lamp and set the temperature to T0 to dry the test soil sample. Record the average deformation displacement of the test soil sample as L', and use a ruler to measure the height of the test soil sample as h'; calculate the original volume V1 and the changed volume V2 of the test soil sample, and calculate the free expansion rate δ; 10. The method for using the EICP combined with polymer reinforced soil sample preparation and performance testing device according to claim 5, characterized in that: The use of the EICP combined with polymer reinforced soil sample preparation and performance testing device for reinforced clay soil water stability testing includes: The demoulding clay soil test sample is placed on the soil sample lifter, and the surface of the test soil sample is photographed with a 3D scanner. The area of ​​the test soil sample is obtained as A. Pure water is filled in the water tank, and the soil sample lifter is controlled to drive the test soil sample on it to immerse in the water. The immersion time is t3. After the immersion is completed, the soil sample lifter is raised and the water in the water tank is emptied. The weight of the soil sample after immersion is recorded as m7. The drying lamp is turned on and the temperature is set to T0. The test soil sample is dried and the weight of the test soil sample is recorded every 10 minutes. When the difference between two consecutive weighings does not exceed 0.1%, the weight of the test soil sample is obtained as m8. The suction M of the soil surface at different times is tested with a suction sensor. c , the moisture content ω is calculated based on the mass, and the soil and water conservation performance of the test soil sample is determined by drawing the moisture content-suction relationship curve under the dry-wet cycle; the soil surface is photographed with a 3D scanner 7, and the data scanned by the 3D scanner are used to build a model and identify the area of ​​the soil surface without cracks as A′ and the area of ​​cracks as A″. The degree of soil cracking can be expressed as the crack rate μ:

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