CN111735740B - Experimental device and method for migration and diffusion of microbial solution in cracks and pores - Google Patents
Experimental device and method for migration and diffusion of microbial solution in cracks and pores Download PDFInfo
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Abstract
本发明公开了一种裂隙‑孔隙中微生物溶液运移扩散的试验装置及试验方法，包括模型箱中填充的含裂隙黄土体，含裂隙黄土体中分别设有注浆管和连接数据采集系统浓度传感器，通过控制灌浆系统注入含裂隙黄土体中细菌菌液和胶结液，数据采集系统获取含裂隙黄土体中的细菌菌液和胶结液运移信息；通过摄像机获取含裂隙黄土体中的微生物溶液扩散形貌。本发明采用室内模型试验的方法较好的模拟不同节理裂隙开度下微生物溶液沿节理裂隙下渗并向两侧土体扩散的动态演化过程，溶液中离子的空间分布规律，解决了含节理裂隙黄土的二维微生物灌浆问题。该方法满足同时单液注浆和分别双液注浆的要求，也能实现无压灌浆和有压灌浆的注浆过程。
The present invention discloses an experimental device and method for the migration and diffusion of microbial solution in fissure-pores, including a fissure-containing loess body filled in a model box, a grouting pipe and a concentration sensor connected to a data acquisition system are respectively provided in the fissure-containing loess body, bacterial liquid and cementing liquid are injected into the fissure-containing loess body by controlling the grouting system, and the data acquisition system obtains the migration information of the bacterial liquid and cementing liquid in the fissure-containing loess body; and the diffusion morphology of the microbial solution in the fissure-containing loess body is obtained by a camera. The present invention adopts the method of indoor model test to better simulate the dynamic evolution process of the microbial solution infiltrating along the joints and fissures and diffusing to the soil bodies on both sides under different joint and fissure openings, and the spatial distribution law of ions in the solution, thereby solving the two-dimensional microbial grouting problem of loess containing joints and fissures. The method meets the requirements of simultaneous single-liquid grouting and separate double-liquid grouting, and can also realize the grouting process of pressureless grouting and pressure grouting.
Description
Technical Field
The invention belongs to the technical field of rock-soil simulation test equipment, and discloses a test device and a test method for migration and diffusion of a microbial solution in a crack-pore.
Background
The joint has a large aperture compared with the aperture of the soil body, the aperture of the joint is usually assumed to be 1, under the rainfall condition, the joint forms an dominant seepage channel, the seepage of water is promoted, and the occurrence of geological disasters such as landslide is aggravated. Loess joints are often the main factors inducing engineering geological disasters, and threaten the safety of engineering construction in loess areas. In view of engineering geological disasters induced by loess joints, repair and management of joints have become an indispensable research work. The microbial solution is a novel green environment-friendly aqueous solution, has the characteristics of low viscosity and high fluidity, and can infiltrate along the joint under a small grouting pressure, thereby realizing the purposes of plugging the joint and reinforcing soil mass in a certain area around the joint. Therefore, the method is used for carrying out the experiment of the migration and diffusion of the MICP solution in the fracture-pore medium, researching the diffusion range of the microbial solution along the joint fracture downwards and towards the two sides of the fracture, and the filling and reinforcing range of calcium carbonate has guiding significance for the engineering of loess areas containing the joint fracture.
The existing method for testing the diffusion process of the microorganism solution in the cracks is mainly applied to rock mass and concrete cracks with parallel plate models, is a one-dimensional testing device, is difficult to drill due to high strength of rock and concrete, is easy to crack the rock mass or the concrete mass in the drilling process to damage a sample, is usually used for embedding a probe of a concentration sensor in the concrete mass in advance and pouring the sample in front of the concrete mass, so that equipment for collecting data in the pouring process cannot be guaranteed to work normally, a certain part of data can be lost, the data collecting equipment cannot be disassembled and recycled, and the test cost is high.
Disclosure of Invention
In order to overcome the defects in the test technology, the invention aims to provide a test device for migration and diffusion of a microbial solution in a fracture-pore and a test method for a dynamic evolution process of the microbial solution which permeates downwards along the joint fracture and diffuses to two sides. The grouting method solves the problem of two-dimensional microbial grouting of the joint fracture loess, meets the requirements of single-liquid grouting and double-liquid grouting respectively, realizes grouting processes of pressureless grouting and pressurized grouting, and has higher measurement precision.
The invention is realized by the following technical scheme.
The invention provides a test device for migration and diffusion of microorganism solution in a crack-pore, which comprises a model box, a data acquisition system, a camera and a grouting system, wherein a crack-containing yellow soil body is filled in the model box, a concentration sensor and a grouting pipe are respectively arranged in the crack-containing yellow soil body, the data acquisition system is connected with the concentration sensor, and the grouting pipe is communicated with the grouting system;
the method comprises the steps of injecting bacterial liquid and cementing liquid into a yellow soil body containing cracks through a grouting system, acquiring migration information of the bacterial liquid and the cementing liquid in the yellow soil body containing the cracks through a data acquisition system, and acquiring a microbial solution diffusion morphology in the yellow soil body containing the cracks through a camera.
Further, the model box is a toughened transparent glass box, scales are marked on the front surface of the model box, the model box is filled with the loess body with cracks, and the middle of the loess body with cracks is longitudinally provided with cracks from the top to the bottom.
Further, the top of the loess body with the fissures is grooved towards two sides along the middle fissures, a bracket connected with a rubber catheter is embedded in the groove, and the catheter is in butt joint with the grouting pipe.
Further, the grouting system comprises a solution storage device, a pressure supply device and a guide pipe, wherein the solution storage device is sequentially communicated with the pressure supply device and the guide pipe to the grouting pipe, and the microbial solution is led into the grouting pipe from the solution storage device.
Further, the grouting pipes are arranged in parallel along the middle crack.
Further, the data acquisition system comprises a data acquisition device and concentration sensors, wherein a plurality of concentration sensor probes are symmetrically distributed in two side holes of the loess body with the crack and are connected to the data acquisition device through wires.
The pressure supply equipment comprises a pressure pump, a pressure regulating valve, a pressure gauge and a flowmeter, wherein the pressure pump is communicated with the solution storage device and the guide pipe, the pressure regulating valve is arranged on the pressure pump, and the pressure gauge and the flowmeter are arranged on the guide pipe.
The invention further provides a method for testing migration and diffusion of a microbial solution in the fissure-pore of the device, which comprises the following steps:
1) Taking a natural loess joint pattern or preparing a soil sample with water content according to the specification of a geotechnical test, manually cutting joint cracks to prepare a yellow soil body with cracks, and placing the yellow soil body into a model box;
2) Arranging a concentration sensor probe in the yellow soil body containing the cracks, connecting the concentration sensor probe to data acquisition equipment, and arranging a camera outside the model box;
3) Placing a bracket with a whole row of grouting pipes in a groove formed in the upper part of a yellow soil body with cracks, forming a sealing cover by the bracket, and sealing the bracket and the groove by epoxy resin sealant;
4) Sequentially connecting the solution storage devices with a pressure pump and a guide pipe to a grouting pipe, respectively injecting bacterial liquid and cementing liquid into the two solution storage devices, starting the pressure pump, and respectively injecting mixed liquid of the bacterial liquid and the cementing liquid into the grouting pipe containing a crack Huang Tuti middle crack through the guide pipe;
5) The pressure value of the mixed liquid flowing into the grouting pipe by the pressure pump is kept, the concentration values of the solution at different positions of the crack Huang Tuti are recorded in real time by the data acquisition system, and the dynamic evolution process of the infiltration of the solution in the sample is recorded by the camera.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
According to the invention, by adopting an indoor model test method, a dynamic evolution process that a microbial solution infiltrates downwards along the joint cracks and diffuses to soil bodies at two sides under different joint crack openings is better simulated, and a spatial distribution rule of ions in the solution is adopted, so that the problem of two-dimensional microbial grouting containing joint crack loess is solved. The method meets the requirements of simultaneous single-liquid grouting and separate double-liquid grouting, can realize grouting processes of pressureless grouting and pressurized grouting, completely records data through an instrument, avoids errors caused by manual recording, has higher measurement precision, and can provide design ideas for microorganism solution reinforcement tests of general fractured soil bodies.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this specification, are incorporated in and constitute a part of this specification and do not limit the application in any way, and in which:
fig. 1 is a schematic structural view of the present invention.
The device comprises a data collector, a concentration sensor, a camera, a model box, a crack Huang Tuti, a pressure gauge, a pressure regulating valve, a pressure pump, a grouting pipe, a bracket, a flowmeter, a 12-1, a switch I, a 12-2, a switch II, a 13, a conduit, a 14, a solution storage device, a 14-1, a bacterial liquid storage bottle, a 14-2, a cementing liquid storage bottle and a 15-three-way conduit, wherein the data collector, the concentration sensor, the camera, the model box, the crack Huang Tuti, the pressure gauge, the pressure regulating valve, the pressure pump, the grouting pipe, the bracket, the conduit and the conduit are sequentially arranged.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present invention are provided for illustration of the invention and are not intended to be limiting.
Referring to fig. 1, a device for testing migration and diffusion of a microbial solution in a slit-pore comprises a data acquisition device, a photographing device, a main body of a testing device, a pressure supply device, a grouting device and a solution storage device 14. The data acquisition device comprises a data acquisition device 1 and a sensor 2, the photographing device comprises a camera 3, the main test device body comprises a model box 4 and a crack Huang Tuti, the pressure supply equipment comprises a pressure gauge 6, a pressure regulating valve 7 and a pressure pump 8, and the grouting equipment comprises a grouting pipe 9, a bracket 10, a flowmeter 11, a switch 12 and a guide pipe 13. The solution storage device 14 comprises a bacteria solution storage bottle 14-1 and a cementing solution storage bottle 14-2.
The model box 4 is a toughened transparent glass box, the front surface of the model box is marked with scales, the model box can be disassembled, and scales are marked along the width direction and the height direction of the front surface of the box body. The camera 3 with tripod is located right in front of the model box 4. The crack Huang Tuti is placed in the toughened glass model box 4 with scales on the front surface, holes are dug on the surface of the yellow soil body with the crack, the hole spacing is symmetrically distributed along the two sides of the crack, the probe of the solubility sensor 2 is arranged in the hole, and the probe is connected to the data acquisition device 1 through a thin wire.
The middle part of the loess body with the fissures is longitudinally provided with fissures from the top to the bottom. And slotting to two sides along the range of 5cm of the middle fracture at the top of the fracture-containing Huang Tuti, embedding a bracket 10 connected with a rubber conduit 13 in the slot, and fixing the grouting pipes 9 in the fracture-containing loess body fracture below the bracket 10 side by side, wherein the conduit is in butt joint with the grouting pipes.
The two branch ports of the solution storage device 14 of the grouting system are respectively connected with the bacteria liquid storage bottle 14-1 and the cementing liquid storage bottle 14-2 through the three-way conduit 15, and two switches are arranged on the two branch ports, so that during the test, the switch I12-1 of the bacteria liquid storage bottle 14-1 can be firstly opened, then the switch II12 of the cementing liquid storage bottle 14-2 is opened to realize single-liquid grouting, and the two switches can be simultaneously opened to realize the double-liquid grouting process.
The output pipe of the three-way conduit 15 is communicated with the pressure pump 8 of the pressure supply device, the pressure pump 8 is provided with a pressure regulating valve 7, the pressure pump 8 is communicated with a conduit 13, the conduit 13 is provided with a flowmeter 11 and a pressure gauge 6, the conduit is communicated with the grouting pipe 9, and bacterial liquid and cementing liquid are injected into the grouting pipe 9 from the solution storage device 14.
Wherein, the rubber conduit 13 is provided with a flowmeter 11, and the flow condition of the filling solution is recorded in real time. The pressure gauge 6 is arranged above the pressure pump 8 with the regulating valve 7, so that grouting pressure can be regulated and controlled at any time, and pressurized grouting is realized. The lens of the digital camera 3 was perpendicular to the center of the test chamber 4 and the overall process of solution diffusion was recorded.
Further, the method for testing the microbial solution migration and diffusion in the fissure-pore by adopting the device comprises the following steps:
1) The soil sample with a certain water content is prepared by cutting a natural loess joint pattern obtained on the site or a soil sample with a certain water content configured according to the geotechnical test specification, then manually cutting joint cracks to prepare a test soil sample, digging grooves in a range of 5cm on two sides of the upper joint crack, and placing the test soil sample in the model box 4.
2) And temporarily not installing a front glass baffle, opening a front baffle of the model box, and measuring the joint crack opening value of the model box with the grooved sample by using a vernier caliper to be 1mm. Symmetrically drilling holes along two sides of the joint fracture by using an earth sampler, drilling a hole every 3cm in the joint fracture direction of the vertical sample, and drilling a hole every 5cm in the joint fracture extending direction, namely, drilling 100 holes on the surface of the sample, arranging a concentration sensor probe 2 at the position of the drilled holes, and terminating the other end of the extended thin wire on the data acquisition equipment 1;
3) And inserting a glass baffle plate on the front surface, and adjusting the position of the camera 3 to enable the camera to record the solution infiltration process in a panoramic way.
4) The bracket 10 with the whole row of grouting pipes 9 is placed in a groove at the upper part of a soil body, and is sealed by epoxy resin sealant, so that microbial solution is ensured to infiltrate downwards along the vertical joint cracks of the grouting pipes, the rest part is watertight, and the soil bodies at the two sides of the joint cracks are not humidified.
5) The error debugging of grouting equipment, namely filling tap water in a solution bottle 14 in advance, connecting a pressure supply device, a grouting device and a solution storage device in series in sequence, placing a rubber catheter 13 interface connected to a bracket into a water storage tank, opening a switch on a rubber tube 15, adjusting a pressure gauge 6, ensuring that the pressure of the infiltrated solution does not cause sample splitting, debugging a test device, and comparing whether the water quantity recorded by a flowmeter 11 is accurate or not by finally measuring the water quantity in the water storage tank. After debugging, the rubber catheter is connected to the bracket 10.
6) The single-liquid grouting test is carried out simultaneously, wherein the pressure value of a pressure gauge 6 is set to be 100kPa, 200kPa and 300kPa respectively, after the test is started, the switch of bacterial liquid and cementing liquid is kept on according to the test scheme requirement, the value of a pressure regulating valve 7 is fixed to a specific pressure value, the pressure value of mixed liquid flowing into a grouting pipe 9 by a pressure pump 8 is kept, the mixed liquid of the bacterial liquid and the cementing liquid is respectively injected into the grouting pipe 9 containing a middle crack of a crack Huang Tuti through a conduit 13, a data acquisition device 1 and a camera digital camera are kept in a starting state all the time, the solution concentration values of different positions of a sample are recorded in real time through the data acquisition device 1, and a contour map of the ion concentration in the sample is drawn by utilizing data analysis software according to the ion concentration values in each drilling hole acquired after the test is ended. The dynamic evolution process of the solution infiltration in the sample is recorded by using the camera 3, the reading of the flowmeter 11 is recorded, and the single-liquid grouting test under the pressurized condition is realized.
7) After the test is finished, the switch of the solution bottle is closed, the valve of the pressure regulating valve is closed in a rotating way, then the switch of the data acquisition equipment is closed, the photo in the digital camera is stored, the bracket 10, the guide pipe 13, the pressure supply equipment and the grouting equipment are removed in sequence, and the cleaning is carried out for later use.
8) And (3) respectively performing two-liquid grouting experiments, namely, respectively presetting the pressure values of the pressure gauge to be 100kPa, 200kPa and 300kPa, and after the experiment is started, according to the requirement of an experiment scheme, firstly only opening a switch I12-1 of bacterial liquid, and repeating the operation steps of the experiments 6) to 7). After the bacterial liquid is filled, standing for 4 hours, then opening a switch II12-2 of the cementing liquid, repeating the operation steps of test 6) -7), injecting the cementing liquid with the same volume according to the consumption of the bacterial liquid recorded by the flowmeter 11, standing for 12 hours after the cementing liquid is filled, enabling the bacterial liquid and the cementing liquid to fully react, and realizing the grouting process of the bacterial liquid and the cementing liquid according to the scheme of 1:1 ratio.
9) After the test is finished, the solution is calibrated according to a graduated scale on the model box 4, the depth value of the solution seeps downwards along the joint cracks and the width value (single width) of the solution towards the two sides of the soil body are obtained, and the migration and diffusion range of the solution in the joint crack-containing yellow soil body is obtained.
10 After the test is finished, the baffle plate at the back of the model box 4 is removed, the soil is drilled and taken according to the drilling position of the embedded concentration sensor probe 2, about 5g of the baffle plate is obtained, the mass of the baffle plate is weighed after drying, then hydrochloric acid is used for washing, the final mass of the baffle plate is weighed after drying, and the mass of the baffle plate is subtracted from the mass of the baffle plate at the front and back to obtain the calcium carbonate content generated by solution reaction. According to the graduated scale on the model box, the width value and the depth value of the calcium carbonate reinforced soil body are tested, and the reinforcing range of the calcium carbonate is obtained.
The test based on the test device mainly comprises two schemes, wherein the first scheme takes joint fracture opening, solution concentration, injection pressure and the like as variables to obtain migration and diffusion rules of the solution, and the second scheme takes curing of the whole joint fracture (such as the joint fracture filling rate reaches a certain degree) as a purpose on the basis of summarizing the rules of the first test result, so that the cementing times are considered for test, and mechanical parameters, performance indexes and optimal solution proportion and process can be obtained by analyzing the test results.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (7)
1. The experimental device for migration and diffusion of the microbial solution in the cracks-pores is characterized by comprising a model box (4), a data acquisition system, a camera (3) and a grouting system, wherein the model box (4) is filled with cracks Huang Tuti, the middle part of the cracks Huang Tuti (5) is longitudinally provided with cracks from top to bottom, the cracks Huang Tuti (5) are respectively provided with a concentration sensor (2) and a grouting pipe (9), the data acquisition system is connected with the concentration sensor (2), and the grouting pipe (9) is communicated with the grouting system;
The grouting system comprises a solution storage device (14), pressure supply equipment and a guide pipe (13), wherein the solution storage device (14) is sequentially communicated with the pressure supply equipment and the guide pipe (13) to the grouting pipe (9), and microbial solution is led into the grouting pipe (9) from the solution storage device (14);
The data acquisition system comprises a data acquisition device (1) and concentration sensors (2), wherein a plurality of probes of the concentration sensors (2) are symmetrically distributed in two side holes containing a crack Huang Tuti (5) and are connected to the data acquisition device (1) through wires;
The grouting system is controlled to inject bacterial liquid and cementing liquid into the crack Huang Tuti, the data acquisition system acquires migration information of the bacterial liquid and the cementing liquid in the crack Huang Tuti (5), and the camera (3) acquires the microbial solution diffusion morphology of the crack Huang Tuti (5).
2. The device for testing the migration and diffusion of a microbial solution in cracks-pores according to claim 1, wherein the model box (4) is a tempered transparent glass box, the front surface of the model box is marked with scales, and the crack-containing Huang Tuti (5) fills the model box (4).
3. The device for testing the migration and diffusion of the microbial solution in the cracks-pores according to claim 2, wherein the top of the crack-containing part Huang Tuti is grooved towards two sides along the middle crack, a bracket 10 for connecting a guide pipe 13 is embedded in the groove, and the guide pipe 13 is in butt joint with the grouting pipe 9.
4. The device for testing the migration and diffusion of the microbial solution in the cracks-pores according to claim 1, wherein a plurality of grouting pipes (9) are arranged in parallel along the middle cracks, and the grouting pipes (9) are detachable.
5. The device for testing the migration and diffusion of the microbial solution in the fissure-pore space according to claim 1, wherein the pressure supply equipment comprises a pressure pump (8), a pressure regulating valve (7), a pressure gauge (6) and a flow meter (11), the pressure pump (8) is communicated with a solution storage device (14) and a conduit (13), the pressure regulating valve (7) is arranged on the pressure pump (8), and the pressure gauge (6) and the flow meter (11) are arranged on the conduit (13).
6. A method of testing microbial solution migration and diffusion in crevice-pore space based on the apparatus of claim 1, comprising the steps of:
and simultaneously carrying out a single-liquid grouting test:
1) Taking a natural loess joint pattern or preparing a soil sample with water content according to the specification of a geotechnical test, manually cutting joint cracks to prepare a yellow soil body with cracks, and placing the yellow soil body into a model box;
2) Arranging a concentration sensor probe in the yellow soil body containing the cracks, connecting the concentration sensor probe to data acquisition equipment, and arranging a camera outside the model box;
3) Placing a bracket with a whole row of grouting pipes in a groove formed in the upper part of a yellow soil body with cracks, forming a sealing cover by the bracket, and sealing the bracket and the groove by epoxy resin sealant;
4) Sequentially connecting the solution storage devices with a pressure pump and a guide pipe to a grouting pipe, respectively injecting bacterial liquid and cementing liquid into the two solution storage devices, starting the pressure pump, and respectively injecting mixed liquid of the bacterial liquid and the cementing liquid into the grouting pipe containing a crack Huang Tuti middle crack through the guide pipe;
5) The pressure value of the mixed liquid flowing into the grouting pipe by the pressure pump is kept, the concentration values of the solution at different positions of the crack Huang Tuti are recorded in real time by the data acquisition system, and the dynamic evolution process of the infiltration of the solution in the sample is recorded by the camera.
7. The method of claim 6, wherein the two-fluid grouting test is performed separately:
according to the steps 1) -3) of the single-liquid grouting test, sequentially connecting a solution storage device with a pressure pump and a guide pipe to a grouting pipe, respectively injecting bacterial liquid and cementing liquid into the two solution storage devices, starting the pressure pump, firstly injecting the bacterial liquid into the grouting pipe containing the crack Huang Tuti middle part crack through the guide pipe, standing for 4 hours, then injecting the cementing liquid with the same volume into the grouting pipe containing the crack Huang Tuti middle part crack through the guide pipe, and standing for 12 hours to enable the bacterial liquid and the cementing liquid to fully react;
The pressure value of the mixed liquid flowing into the grouting pipe by the pressure pump is kept, the concentration values of the solution at different positions of the crack Huang Tuti are recorded in real time by the data acquisition system, and the dynamic evolution process of the infiltration of the solution in the sample is recorded by the camera.
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