A slope biomineralization reinforcement system and method based on strain activity regulation

Abstract

This invention discloses a slope biomineralization reinforcement system and method based on microbial activity regulation, belonging to the field of slope engineering technology. The system includes a thermal regulation module and a grouting module. The thermal regulation module includes an energy pile unit, a modified geogrid unit, and a heat pump unit. The energy pile unit includes several energy piles, each comprising a pile body embedded in the slope and a heat exchange pipe within the pile body. The heat exchange pipe exchanges heat with the soil constant-temperature layer through a heat exchange medium flowing through its internal pile end. The modified geogrid unit includes a thermal regulation geogrid. The thermal regulation geogrid is a grid-shaped pipe structure embedded in the slope surface, exchanging heat with the soil surface through a heat exchange medium flowing through its internal grid end. The heat exchange medium at the pile end exchanges heat with the heat exchange medium at the grid end through the heat pump unit, which can convert low-grade geothermal energy into high-grade heat energy. The grouting module is used to sequentially spray microbial solution and cementing solution into the soil. This invention has advantages such as stability.

Description

Technical Field

[0001] This invention belongs to the field of slope engineering technology, and relates to a slope reinforcement method, particularly a slope biomineralization reinforcement system and method based on the regulation of fungal activity. Background Technology

[0002] As the technology of MIP slope reinforcement continues to mature, the issue of MIP reinforcement depth has become increasingly apparent. During spring and summer, the higher temperatures are conducive to mineralization reactions, leading to calcium carbonate precipitation on the soil surface during the infiltration of bacterial and cementing solutions into the slope. This significantly reduces the slope's surface permeability coefficient, making it difficult for subsequent reinforcement liquids to infiltrate further, resulting in only shallow reinforcement. Therefore, increasing the reinforcement depth using MIP technology is of practical significance.

[0003] Currently, to address the issue of insufficient reinforcement depth in MIP (Microbial Concrete-Based Pore) slope reinforcement, methods such as excavation and mixing of soil and drilling and grouting are still commonly used. Patent application CN118407441A proposes a mud-sand-based ecological slope protection structure and a precise drip irrigation system and construction method, achieving MIP-plant hybrid slope protection through layered mixing and precise drip irrigation. Patent application CN115182363A proposes a slope reinforcement device and method based on microbial mineralization, achieving deep soil grouting reinforcement through the construction of grouting equipment. The former improves the reinforcement effect through a combined reinforcement method of mixing plant seeds with soil and drip irrigation of bacterial solution and cementing solution, while the latter achieves deep soil reinforcement through drilling and grouting. However, the former does not mention methods to increase the reinforcement depth of MIP, while the latter requires extensive drilling at the reinforcement site to achieve deep reinforcement, thus still presenting the aforementioned technical problems. Summary of the Invention

[0004] This invention provides a slope biomineralization reinforcement system and method based on the regulation of microbial activity, in order to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a slope biomineralization reinforcement system based on the regulation of microbial activity, comprising a thermal regulation module and a grouting module; the thermal regulation module includes an energy pile unit, a modified geogrid unit, and a heat pump unit; the energy pile unit includes a plurality of energy piles; the energy pile includes a pile body buried in the slope and a heat exchange pipe disposed within the pile body; the heat exchange pipe exchanges heat with the soil constant temperature layer through a heat exchange medium flowing inside the pile end; the modified geogrid unit includes a thermal regulation grid; the thermal regulation grid is a grid-shaped pipe structure, buried in the slope surface, and exchanges heat with the soil surface through a heat exchange medium flowing inside the grid end; the heat exchange medium at the pile end exchanges heat with the heat exchange medium at the grid end through the heat pump unit, and the heat pump unit can improve the heat exchange energy level; the grouting module is used to sequentially spray bacterial solution and cementing solution into the soil.

[0006] To optimize the above technical solution, the specific measures also include: Furthermore, the heat pump unit includes an evaporator, a compressor, a condenser, and an expansion valve; the cold-side channel of the evaporator, the compressor, the hot-side channel of the condenser, and the expansion valve are sequentially connected to form a circulation loop, with the heat pump end heat exchanger circulating internally; the energy pile unit also includes a pile-end evaporator circulation pipe and a pile-end condenser circulation pipe; the heat exchange buried pipe is connected to the hot-side channel of the evaporator through the pile-end evaporator circulation pipe to form a pile-end cooling circulation loop, and the heat exchange buried pipe is also connected to the cold-side channel of the condenser through the pile-end condenser circulation pipe to form a pile-end heating loop. The system includes a circulation loop; both the pile-end evaporator circulation pipe and the pile-end condenser circulation pipe are equipped with pile-end valves; the modified geogrid unit also includes a grid-end evaporator circulation pipe and a grid-end condenser circulation pipe; the thermally controlled geogrid is connected to the hot-side channel of the evaporator via the grid-end evaporator circulation pipe to form a grid-end cooling circulation loop, and the thermally controlled geogrid is also connected to the cold-side channel of the condenser via the grid-end condenser circulation pipe to form a grid-end heating circulation loop; both the grid-end evaporator circulation pipe and the grid-end condenser circulation pipe are equipped with grid-end valves.

[0007] Furthermore, it also includes a monitoring module; the monitoring module includes several temperature and humidity sensors; the temperature and humidity sensors are used to detect the temperature and humidity of the soil.

[0008] Furthermore, the grouting module includes a bacterial solution storage tank, a cementing solution storage tank, several spray pipes, and several spray heads; both the bacterial solution storage tank and the cementing solution storage tank are connected to the spray pipes through pipelines equipped with grouting valves; the spray pipes are located below the heat-regulating grid, and the spray heads are located on the pipe walls of the spray pipes; the bacterial solution / cementing solution is injected into the soil sequentially through the spray pipes and the spray heads.

[0009] Furthermore, the heat control grid is composed of several cross-connected heat exchange pipes; several spray pipes are cross-connected to form a grid-shaped spray grid, which is overlapped and fixed directly below the heat exchange pipes; the spray head is disposed on the lower side wall of the spray pipe.

[0010] Furthermore, the spray pipe and the heat exchange pipe are fixedly connected by several pipe fixing devices and fixed in the soil; the pipe fixing device includes two fixing members; the fixing member is composed of a sleeve and a fixing plate fixed outside the sleeve; the two fixing members are arranged in parallel and fixed by the sleeve; the two sleeves are respectively sleeved on the heat exchange pipe and the spray pipe, and the temperature and humidity sensor passes through the two fixing plates and is inserted into the soil.

[0011] Furthermore, the energy pile also includes a pile body connector; the pile body connector consists of a collar and a connecting pipe fixed to the side of the collar; the collar is fixedly fitted on the top of the pile body; the overlapping heat exchange pipe and the spray pipe are fixedly inserted into the connecting pipe.

[0012] Furthermore, the thermal control grid is divided into several zones along the inclined direction of the edge break. Within each zone, an S-shaped flow channel is formed by setting an isolation structure within the thermal control grid. The modified geogrid unit also includes two water collection devices, which are respectively connected to the input and output ends of the thermal control grid. The water collection device consists of a main water collection pipe and several water collection pipes connected to the main water collection pipe. The main water collection pipe is connected to both the evaporator circulation pipe and the condenser circulation pipe at the grid end. Each of the water collection pipes corresponds to and is connected to one of the S-shaped flow channels of the several zones of the thermal control grid.

[0013] Furthermore, the monitoring module also includes several distributed strain sensors; the distributed strain sensors are disposed on the side of the energy pile body and are used to detect the strain of the pile body.

[0014] Secondly, the present invention also provides a slope biomineralization reinforcement method based on the regulation of fungal activity, implemented using the aforementioned slope biomineralization reinforcement system based on the regulation of fungal activity; the method includes the following steps: S1: Slope construction includes pouring the energy piles, installing the thermal control grid, and installing the grouting module; S2: Detect soil temperature before reinforcement T and the temperature range for inhibiting biomineralization reaction [ T 1, T 2] Comparison: like T < T 1, then the soil is heated to [temperature] by the heat pump unit. T 1,T 2]; like T ∈[ T 1, T 2], then directly perform S3 grouting on the soil; like T > T 2, then the soil is cooled to [temperature] by the heat pump unit. T 1, T 2]; in, T 1 represents the low temperature at which the bacterial strain becomes inactive. T 2. Low temperature to inhibit biomineralization reaction; The method of heating the soil through the heat pump unit is as follows: controlling the pile end valve and the grid end valve, so that the heat exchange buried pipe of the energy pile is connected to the hot side channel of the evaporator through the pile end evaporator circulation pipe, and the heat regulation grid is connected to the cold side channel of the condenser through the grid end condenser circulation pipe. The method of cooling the soil through the heat pump unit is as follows: control the pile end valve and the grid end valve so that the heat exchange buried pipe of the energy pile is connected to the cold side channel of the condenser through the pile end condenser circulation pipe, and the heat regulation grid is connected to the hot side channel of the evaporator through the grid end evaporator circulation pipe. S3: Soil temperature reaches the range that inhibits biomineralization reaction. T 1, T 2] After heat preservation, start the grouting module, spray bacterial solution and cementing solution into the soil in sequence and repeat the cycle. Between spraying bacterial solution and cementing solution, a certain time interval is given to allow the grout to fully infiltrate. Stop spraying grout when the grout has penetrated to the expected reinforcement depth. S4: The soil temperature detected in S2 T Temperature range that promotes biomineralization reaction [ T 3, T 4] Comparison: like T < T 3. The soil is heated to [temperature] by the heat pump unit. T 3, T 4]; like T ∈[ T 3, T 4], then the soil is heated to [temperature] using ambient temperature or through the heat pump unit. T 3, T 4]; like T > T 4. Then reduce the power of the heat pump unit to continue cooling the soil through the heat pump unit to [ T3, T 4]; in, T 3. To promote biomineralization reactions, high temperatures are required. T 4. To suppress the high temperature of biomineralization reaction; S5, Soil temperature reaches the temperature range that promotes biomineralization reaction. T 3, T 4] After heat preservation, when the biomineralization reaction stops, the thermal control module is turned off; S6. Test the soil reinforcement effect. If it does not meet expectations, repeat S2~S5. Finally, spray the surface of the slope with bacterial solution and cementing solution for surface reinforcement.

[0015] The beneficial effects of this invention are as follows: I. This invention, based on the principle that temperature decreases can inhibit bacterial activity and reduce the catalytic efficiency of biological enzymes, proposes a system and method for precisely regulating the spatial distribution of bacterial activity to improve reinforcement effects. By controlling the mineralization reaction rate through temperature regulation, the reinforcement depth of MICP technology can be controllably adjusted. A thermal control module is used to adjust the surface temperature of the slope soil to reach a temperature range that inhibits biomineralization reactions, suppresses urease activity, and reduces the shallow mineralization reaction rate, creating a time window for the grout to penetrate deeper into the soil. After the grout has fully infiltrated, the surface temperature of the slope soil is adjusted to reach a temperature range that promotes biomineralization reactions, fully activating urease activity and inducing rapid mineralization reactions, achieving simultaneous soil mineralization reinforcement at all depths. This system and method achieve dynamic adjustment of the biomineralization reinforcement depth by regulating the grout infiltration time and monitoring the grout infiltration depth in real time; by synchronously activating microbial activity at all depths, it alleviates the problem of uneven reinforcement caused by different mineralization reaction sequences; by adjusting the temperature to the optimal reaction temperature, the generated calcium carbonate precipitate particles are made to have appropriate shape and size and are evenly distributed in the soil, which is more conducive to slope protection, while improving the biomineralization reaction rate and shortening the construction period.

[0016] II. In this invention, the thermal control module for regulating soil temperature and the grouting module for spraying reinforcement grout are interconnected with the soil reinforced by MICP technology to form an "anti-sliding energy pile". Grid reinforced body The reinforcement structure is a combination of "biomineralized soil," "biological soil," and "gravel." The anti-slide energy piles, relying on their own structural strength and the anchoring effect of being embedded in stable strata, provide lateral restraint to the landslide body, achieving slope stability. The grid-reinforced body, through its reinforcement... The soil-soil interaction mechanism transforms soil with low tensile strength into a reinforced soil composite with higher tensile and shear strength, improving slope stability. Biomineralized soil utilizes MIP technology to generate calcium carbonate crystals in the soil pores, altering the soil's structure and cementation at the microscale, thereby macroscopically improving soil strength, stiffness, erosion resistance, and reducing permeability. Connecting the anti-slide energy piles, the grid reinforcement, and the biomineralized soil to form a reinforced whole further enhances the overall integrity and stability of the slope.

[0017] III. This invention proposes a biomineralization slope reinforcement system and method utilizing temperature-regulated microbial activity. It introduces energy piles into the field of slope reinforcement, constructing a vertical temperature exchange system through energy pile units, modified geogrid units, and heat pump units to utilize geothermal resources in slope reinforcement projects. This system uses energy piles to vertically transport geothermal resources to the surface, where the heat pump unit converts low-grade geothermal energy into high-grade heat energy. The heat is then transferred to the slope soil via a specially designed geogrid on the surface, achieving soil temperature regulation. Simultaneously, each component in the vertical temperature exchange system enhances slope stability within the overall reinforcement system, fully leveraging the role of the energy pile unit in slope reinforcement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the slope biomineralization reinforcement system; Figure 2 This is a schematic diagram of the external structure of the energy pile; Figure 3 This is a schematic diagram of the internal structure of the energy pile; Figure 4 This is a schematic diagram showing the connection relationship between the energy pile, the heat regulation grid, and the heat pump unit. Figure 5 This is a schematic diagram showing the connection relationship between the energy pile, the thermal control grid, and the heat pump unit in the heating mode; Figure 6 This is a schematic diagram showing the connection relationship between the energy pile, the thermal control grid, and the heat pump unit in cooling mode; Figure 7 This is a schematic diagram of the connection structure between the heat control grid and the spray pipe; Figure 8 This is a schematic diagram of the connection structure between the pipe fixing device and the temperature and humidity sensor; Figure 9 This is a schematic diagram of the connection structure between the pile body connectors, heat exchange pipes, and spray pipes; Figure 10 This is a schematic diagram of the connection structure between the water collector and the heat control grid. The labels in the attached diagram are as follows: 111, Energy pile; 1111, Pile body; 1112, Heat exchange buried pipe; 1113, Pile body connector; 112, Pile end evaporator circulation pipe; 113, Pile end condenser circulation pipe; 114, Pile end valve; 115, Pile end circulation pump; 121, Thermal control grid; 1211, Heat exchange pipe; 1212, Water collector; 122, Grid end evaporator circulation pipe; 123, Grid end condenser circulation pipe; 124, Grid end valve; 125, Grid end circulation pump; 13, Heat pump unit; 131, Evaporator; 132, Compressor; 133, Condenser; 134, Expansion valve; 21, Bacterial liquid storage tank; 22, Cementing liquid storage tank; 23, Spray pipe; 24, Spray head; 25, Pipe fixing device; 31, Temperature and humidity sensor; 32, Distributed strain sensor. Detailed Implementation

[0019] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0020] This invention provides a slope biomineralization reinforcement system based on the regulation of microbial activity, including a thermal regulation module, a grouting module, a monitoring module, and a control module.

[0021] like Figure 1 As shown, the thermal control module includes an energy pile unit, a modified geogrid unit, and a heat pump unit 13. Figures 1-3 As shown, the energy pile unit includes several energy piles 111. Each energy pile 111 includes a pile body 1111 embedded in the slope and a heat exchange pipe 1112 installed within the pile body 1111. The heat exchange pipe 1112 exchanges heat with the constant-temperature layer of the soil through a heat exchange medium flowing through its internal pile tip. Figure 1 As shown, the modified geogrid unit includes a thermally controlled geogrid 121. The thermally controlled geogrid 121 is a geogrid-shaped pipe structure, buried in the surface layer of the slope, and exchanges heat with the soil surface through the heat exchange medium flowing inside the geogrid.

[0022] The heat exchange medium at the pile end exchanges heat with the heat exchange medium at the grid end through the heat pump unit 13, and the heat pump unit 13 can convert low-grade geothermal energy into high-grade thermal energy. That is, when the heat exchange medium at the pile end releases heat to the heat exchange medium at the grid end through the heat pump unit 13, the heat pump unit 13 can further heat the heat exchange medium at the grid end. When the heat exchange medium at the pile end absorbs heat from the heat exchange medium at the grid end through the heat pump unit 13, the heat pump unit 13 can further cool the heat exchange medium at the grid end.

[0023] The grouting module is used to sequentially spray bacterial solution and cementing solution containing bacteria that produce urease during metabolism into the soil.

[0024] Among them, such as Figures 4-6As shown, the heat pump unit 13 includes an evaporator 131, a compressor 132, a condenser 133, and an expansion valve 134. The cold-side passage of the evaporator 131, the compressor 132, the hot-side passage of the condenser 133, and the expansion valve 134 are sequentially connected to form a circulation loop, with the heat pump end heat exchanger circulating internally. Specifically, the heat pump end heat exchanger is a refrigerant. The energy pile unit also includes a pile-end evaporator circulation pipe 112 and a pile-end condenser circulation pipe 113. The heat exchange buried pipe 1112 is connected to the hot-side passage of the evaporator 131 through the pile-end evaporator circulation pipe 112 to form a pile-end cooling circulation loop, and the heat exchange buried pipe 1112 is also connected to the cold-side passage of the condenser 133 through the pile-end condenser circulation pipe 113 to form a pile-end heating circulation loop. Both the pile-end evaporator circulation pipe 112 and the pile-end condenser circulation pipe 113 are equipped with pile-end valves 114 and pile-end circulation pumps 115 to control the circulation of the pile-end heat exchange medium in the pile-end cooling / heating circulation loop. The modified geogrid unit also includes a grid-end evaporator circulation pipe 122 and a grid-end condenser circulation pipe 123. The thermally controlled grid 121 is connected to the hot-side channel of the evaporator 131 via the grid-end evaporator circulation pipe 122 to form a grid-end cooling circulation loop. The thermally controlled grid 121 is also connected to the cold-side channel of the condenser 133 via the grid-end condenser circulation pipe 123 to form a grid-end heating circulation loop. Both the grid-end evaporator circulation pipe 122 and the grid-end condenser circulation pipe 123 are equipped with grid-end valves 124 and grid-end circulation pumps 125 to control the circulation of the grid-end heat exchange medium in the grid-end cooling / heating circulation loop.

[0025] like Figure 2 , Figure 3 and Figure 8 As shown, the monitoring module includes several temperature and humidity sensors 31 and several distributed strain sensors 32. The temperature and humidity sensors 31 are used to detect the temperature and humidity of the soil. The distributed strain sensors 32 are installed on the side of the energy pile 111 facing the top of the slope to detect the strain of the pile 1111, thereby continuously monitoring the slope stability.

[0026] like Figure 1 and Figure 7 As shown, the grouting module includes a bacterial solution storage tank 21, a cementing fluid storage tank 22, several spray pipes 23, and several spray heads 24. Both the bacterial solution storage tank 21 and the cementing fluid storage tank 22 are connected to the spray pipes 23 via pipelines equipped with grouting valves. The spray pipes 23 are positioned below the heat-regulating grid 121, and the spray heads 24 are mounted on the pipe walls of the spray pipes 23. The bacterial solution / cementing fluid is injected into the soil sequentially through the spray pipes 23 and the spray heads 24.

[0027] Specifically, such as Figure 7As shown, the heat control grid 121 is composed of several cross-connected heat exchange pipes 1211. Several spray pipes 23 are cross-connected to form a grid-like spray grid, which is overlapped and fixed directly below the heat exchange pipes 1211. Spray heads 24 are disposed on the lower wall of the spray pipes 23.

[0028] More specifically, such as Figure 7 and Figure 8 As shown, the sprinkler pipe 23 and the heat exchange pipe 1211 are fixedly connected by several pipe fixing devices 25 and fixed in the soil. Each pipe fixing device 25 includes two fixing members. Each fixing member consists of a sleeve and a fixing plate fixed outside the sleeve. The two fixing members are arranged in parallel and fixed by the sleeve. The two sleeves are respectively fitted onto the heat exchange pipe 1211 and the sprinkler pipe 23. The temperature and humidity sensor 31 passes through the two fixing plates and is inserted into the soil, thereby fixing the pipe fixing device 25 connecting the heat exchange pipe 1211 and the sprinkler pipe 23 in the soil. The temperature and humidity sensor 31 monitors the soil temperature and humidity while also fixing the heat control grid 121 and the sprinkler grid, and providing secondary reinforcement to the slope.

[0029] More specifically, the temperature and humidity sensor 31 includes a fixing bolt and three probes. The fixing bolt passes through two fixing plates of the pipe fixing device 25 and is inserted into the soil to fix the pipe fixing device 25. The probes are fixed to the bottom end of the fixing bolt, with the top end located below the sprinkler pipe 23 and the bottom end located at the designed reinforcement depth. Temperature is measured using a thermistor built into the probe, and humidity is measured by calculating the soil dielectric constant through the emission of high-frequency electromagnetic waves between adjacent probes to obtain soil moisture.

[0030] like Figure 2 , Figure 3 and Figure 9 As shown, the energy pile 111 also includes a pile body connector 1113. The pile body connector 1113 consists of a collar and a connecting pipe fixed to the side of the collar. The collar is fixedly fitted onto the top of the pile body 1111. Overlapping heat exchange pipes 1211 and spray pipes 23 are fixedly inserted into the connecting pipe. The pile body connector 1113 connects several energy piles 111, heat control grids 121, and spray pipes 23 into a single unit, further improving slope stability.

[0031] like Figure 4 and Figure 10As shown, the thermal control grid 121 is divided into several sections along the inclined direction of the edge break. Within each section, an S-shaped flow channel is formed by setting an isolation structure inside the thermal control grid. The modified geogrid unit also includes two water collection devices 1212, which are connected to the input and output ends of the thermal control grid 121, respectively. The water collection device 1212 consists of a main water collection pipe and several water collection pipes connected to the main water collection pipe. The main water collection pipe is connected to both the evaporator circulation pipe 122 and the condenser circulation pipe 123 at the grid end. The several water collection pipes correspond one-to-one with and are connected to the S-shaped flow channels of the several sections of the thermal control grid 121. By setting the water collection devices 1212 and the S-shaped flow channels, the heat exchange medium at the grid end can flow along a specific path within the grid, thereby avoiding the problem of liquid accumulation caused by gravity.

[0032] The control module connects to sensors to receive detection signals and also connects to valves and pumps on the pipeline to control the flow of the heat exchange medium and grout. The control module monitors data from the monitoring module and adjusts heat exchange efficiency and grouting cycle time in real time, achieving precise and efficient construction and avoiding a decrease in reinforcement effect due to human factors.

[0033] The slope biomineralization reinforcement method includes the following steps: S1: Slope construction includes pouring energy piles 111, burying thermal control grids 121, and installing grouting modules.

[0034] Specifically, it includes the following steps: S11: Investigate the slope to be reinforced. By investigating the size of the reinforcement site and the properties of the soil layers, confirm the boundaries, scope and geological conditions, make a preliminary estimate of the amount of reinforcement grout (bacterial solution and cementing solution) and the length of various pipelines, and at the same time determine the construction positions of energy pile 111, heat control grid 121 and sprinkler pipe 23.

[0035] S12: Construction layout, cleaning, leveling and reinforcing the surface of the area, and trench excavation.

[0036] S13: Excavate pile holes at the pile positions marked out in S12 and erect formwork for the portion above the ground surface. Simultaneously, fabricate a reinforcing cage and tie the heat exchange pipe 1112. Place the fabricated reinforcing cage and heat exchange pipe 1112 into the pile hole. Place a distributed strain sensor 32 on the side of the hole wall facing the top of the slope. Pull the heat exchange pipe 1112 out of the soil on both sides to install inlet and outlet pipe protective shells. Pour concrete to form the energy pile 111.

[0037] S14: Install a sprinkler pipe 23, a water collector 1212, a heat control grid 121, and a pipe fixing device 25 in the trench excavated on the slope, insert a temperature and humidity sensor 31 to fix the pipe, and pull the pipe out of the soil.

[0038] S15: Construct a heat pump unit 13, a bacterial liquid storage tank 21, and a cementing liquid storage tank 22 on one side of the reinforced area. Connect the heat exchange buried pipe 1112 of the energy pile 111 to the evaporator 131 via the pile-end evaporator circulation pipe 112 and to the condenser 133 via the pile-end condenser circulation pipe 113. Connect the main water collection pipe of the water collector 1212 connected to the heat control grid 121 to the evaporator 131 via the grid-end evaporator circulation pipe 122 and to the condenser 133 via the grid-end condenser circulation pipe 123. Connect the spray pipe 23 to the bacterial liquid storage tank 21 and the cementing liquid storage tank 22. Connect the sensors, valves, and pumps to the control module.

[0039] S16: After checking and confirming that everything is correct, backfill and compact the excavated trench.

[0040] S2: Detect soil temperature before reinforcement T and the temperature range for inhibiting biomineralization reaction [ T 1, T 2] Comparison: like T < T 1. The soil is heated to [temperature] by heat pump unit 13. T 1, T 2).

[0041] like T ∈[ T 1, T [2] Then, directly perform S3 grouting on the soil.

[0042] like T > T 2. The soil is then cooled to [temperature] by heat pump unit 13. T 1, T 2).

[0043] in, T 1 represents the low temperature at which the bacterial strain becomes inactive. T 2 is the low temperature at which the biomineralization reaction begins to be inhibited. When the temperature is below this, the activity of the microorganism begins to decrease and the biomineralization reaction is inhibited. The specific value is related to the specific microbial species.

[0044] The soil is heated by the heat pump unit 13 as follows: The pile-end valve 114 and the grid-end valve 124 are controlled to connect the heat exchange pipe 1112 of the energy pile 111 to the hot-side channel of the evaporator 131 via the pile-end evaporator circulation pipe 112. The heat-regulating grid 121 is connected to the cold-side channel of the condenser 133 via the grid-end condenser circulation pipe 123. At this time, the pile-end heat exchange medium exchanges heat with the heat pump-end heat exchange medium in the evaporator 131 through the pile-end cooling circulation loop. The heat pump-end heat exchange medium absorbs the heat from the pile-end heat exchange medium and evaporates into low-temperature, low-pressure steam. This steam is then compressed into high-temperature, high-pressure superheated steam in the compressor 132, and then exchanges heat with the grid-end heat exchange medium in the condenser 133 through the grid-end heating circulation loop. The grid-end heat exchange medium absorbs the heat from the heat pump-end heat exchange medium, thereby heating the soil.

[0045] The soil is cooled by the heat pump unit 13 as follows: The pile-end valve 114 and the grid-end valve 124 are controlled so that the heat exchange pipe 1112 of the energy pile 111 is connected to the cold side channel of the condenser 133 through the pile-end condenser circulation pipe 113, and the heat-regulating grid 121 is connected to the hot side channel of the evaporator 131 through the grid-end evaporator circulation pipe 122. At this time, the pile-end heat exchange medium exchanges heat with the heat pump-end heat exchange medium in the condenser 133 through the pile-end heating circulation loop. The pile-end heat exchange medium absorbs the heat from the heat pump-end heat exchange medium, condensing it into a room-temperature, high-pressure liquid. Then, it becomes a low-temperature, low-pressure gas-liquid mixture in the expansion valve 134, and then exchanges heat with the grid-end heat exchange medium in the evaporator 131 through the grid-end cooling circulation loop. The heat pump-end heat exchange medium absorbs the heat from the grid-end heat exchange medium, thereby cooling the soil.

[0046] S3: Soil temperature reaches the range that inhibits biomineralization reaction. T 1, T 2] After heat preservation, the grouting module is started, and bacterial solution and cementing solution are sprayed into the soil in sequence and repeated. A certain time interval is given between spraying the bacterial solution and cementing solution to allow the grout to fully infiltrate. When the temperature and humidity sensor 31 detects that the grout has penetrated to the expected reinforcement depth, the spraying of grout is stopped.

[0047] S4: The soil temperature detected in S2 T Temperature range that promotes biomineralization reaction [ T 3, T 4] Comparison: like T < T 3. The soil is heated to [temperature] by heat pump unit 13. T 3, T 4).

[0048] like T ∈[ T 3, T4], then the soil is heated to [temperature] using ambient temperature or through heat pump unit 13. T 3, T 4).

[0049] like T > T 4. Then reduce the power of heat pump unit 13 to continue cooling the soil through heat pump unit 13 to [ T 3, T [4] That is, the cooling function is still achieved through the pile end heating circulation loop and the grid end cooling circulation loop, but the power of the heat pump unit 13 is reduced and the ambient temperature is high (> T 4), therefore the soil gradually heats up.

[0050] in, T 3. High temperature to promote biomineralization reaction, that is, the high temperature at which the biomineralization reaction begins to be promoted. When the temperature is higher than this, the strain is in a highly active state and the biomineralization reaction is promoted. The specific value is related to the specific strain. T 4 is the high temperature at which the biomineralization reaction begins to be inhibited. When the temperature is higher than this, the activity of the microorganisms begins to decrease and the biomineralization reaction is inhibited. The specific value is related to the specific microbial species.

[0051] S5, Soil temperature reaches the temperature range that promotes biomineralization reaction. T 3, T 4] After heat preservation, when the biomineralization reaction stops, the heat control module is turned off; specifically, the biomineralization reaction can be judged by monitoring the soil moisture. When the soil moisture stops decreasing, the biomineralization reaction stops.

[0052] S6. In-situ tests are used to assess the soil reinforcement effect. If the expected results are not achieved, S2-S5 are repeated. Finally, a bacterial agent and a cementing agent are sprayed onto the slope surface for surface reinforcement. The surface reinforcement effect is then assessed using equipment such as a miniature penetrator. If the strength does not meet the expected results, the surface reinforcement is repeated.

[0053] In one specific embodiment, the bacterial solution is prepared using Bacillus pasteurellii, and the temperature range for inhibiting the biomineralization reaction is [0℃, 15℃], while the temperature range for promoting the biomineralization reaction is [25℃, 35℃].

[0054] In this invention, unless otherwise stated, scientific and technical terms used herein have the meanings commonly understood by those skilled in the art. Furthermore, the reagents, materials, and procedures used herein are all widely used in the relevant fields.

[0055] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in the invention are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0056] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A slope biomineralization reinforcement system based on strain activity regulation, characterized in that: Includes a thermal control module and a grouting module; The thermal control module includes an energy pile unit, a modified geogrid unit, and a heat pump unit. The energy pile unit includes several energy piles; the energy pile includes a pile body buried in the slope and a heat exchange pipe installed in the pile body; the heat exchange pipe exchanges heat with the constant temperature layer of the soil through the heat exchange working medium flowing inside the pile end. The modified geogrid unit includes a thermal control grid; the thermal control grid is a grid-shaped pipe structure, buried in the surface layer of the slope, and exchanges heat with the soil surface through the heat exchange medium flowing inside the grid ends. The heat exchange medium at the pile end exchanges heat with the heat exchange medium at the grid end through the heat pump unit, and the heat pump unit can convert low-grade geothermal energy into high-grade thermal energy. The grouting module is used to sequentially spray bacterial solution and cementing solution into the soil.

2. The slope biomineralization reinforcement system based on strain activity regulation according to claim 1, characterized in that: The heat pump unit includes an evaporator, a compressor, a condenser, and an expansion valve; the cold side channel of the evaporator, the compressor, the hot side channel of the condenser, and the expansion valve are connected in sequence to form a circulation loop, with the heat pump end heat exchange medium circulating inside; The energy pile unit also includes a pile-end evaporator circulation pipe and a pile-end condenser circulation pipe; the heat exchange buried pipe is connected to the hot side channel of the evaporator through the pile-end evaporator circulation pipe to form a pile-end cooling circulation loop, and the heat exchange buried pipe is also connected to the cold side channel of the condenser through the pile-end condenser circulation pipe to form a pile-end heating circulation loop; both the pile-end evaporator circulation pipe and the pile-end condenser circulation pipe are equipped with pile-end valves. The modified geogrid unit further includes a grid-end evaporator circulation pipe and a grid-end condenser circulation pipe; the thermally controlled geogrid is connected to the hot side channel of the evaporator through the grid-end evaporator circulation pipe to form a grid-end cooling circulation loop, and the thermally controlled geogrid is also connected to the cold side channel of the condenser through the grid-end condenser circulation pipe to form a grid-end heating circulation loop; both the grid-end evaporator circulation pipe and the grid-end condenser circulation pipe are equipped with grid-end valves.

3. The slope biomineralization reinforcement system based on strain activity regulation according to claim 1, characterized in that: It also includes a monitoring module; The monitoring module includes several temperature and humidity sensors; The temperature and humidity sensor is used to detect the temperature and humidity of the soil.

4. The slope biomineralization reinforcement system based on strain activity regulation according to claim 3, characterized in that: The grouting module includes a bacterial liquid storage tank, a cementing liquid storage tank, several spray pipes, and several spray heads; Both the bacterial liquid storage tank and the cementing liquid storage tank are connected to the spray pipe through pipelines equipped with grouting valves; The spray pipe is located below the heat-regulating grid, and the spray head is located on the pipe wall of the spray pipe. The bacterial solution / the cementing solution is injected into the soil sequentially through the spray pipe and the spray head.

5. The slope biomineralization reinforcement system based on strain activity regulation according to claim 4, characterized in that: The heat control grid is composed of several cross-connected heat exchange tubes; Several spray pipes are cross-connected to form a grid-like spray grid, which is then overlapped and fixed directly below the heat exchange pipe; The spray head is located on the lower wall of the spray pipe.

6. The slope biomineralization reinforcement system based on strain activity regulation according to claim 5, characterized in that: The spray pipe and the heat exchange pipe are fixedly connected by several pipe fixing devices and fixed in the soil. The pipe fastener includes two fasteners; each fastener consists of a sleeve and a fixing piece fixed outside the sleeve; the two fasteners are arranged in parallel and fixed through the sleeve. The two sleeves are respectively fitted onto the heat exchange pipe and the spray pipe, and the temperature and humidity sensor passes through the two fixing plates and is inserted into the soil.

7. The slope biomineralization reinforcement system based on strain activity regulation according to claim 5, characterized in that: The energy pile also includes pile body connectors; The pile body connector consists of a collar and a connecting pipe fixed to the side of the collar; the collar is fixedly fitted on the top of the pile body; the overlapping heat exchange pipe and spray pipe are fixedly inserted into the connecting pipe.

8. The slope biomineralization reinforcement system based on strain activity regulation according to claim 2, characterized in that: The thermal control grid is divided into several zones along the inclined direction of the edge break. Within each zone, an S-shaped flow channel is formed by setting an isolation structure within the thermal control grid. The modified geogrid unit also includes two water collection and water distribution devices, which are respectively connected to the input end and the output end of the thermal control grid. The water collection and water distribution device consists of a main water collection pipe and several water collection pipes connected to the main water collection pipe. The main water collection pipe is connected to the evaporator circulation pipe and the condenser circulation pipe at the grid end. The several water collection pipes correspond one-to-one with and are connected to the S-shaped flow channels of several zones of the thermal control grid.

9. The slope biomineralization reinforcement system based on strain activity regulation according to claim 3, characterized in that: The monitoring module also includes several distributed strain sensors; The distributed strain sensor is installed on the side of the energy pile body to detect the strain of the pile body.

10. A method for slope bio-mineralization reinforcement based on strain activity regulation, characterized in that: The slope biomineralization reinforcement system based on strain activity regulation as described in any one of claims 2 to 9 shall be used for implementation; The method includes the following steps: S1: Slope construction includes pouring the energy piles, installing the thermal control grid, and installing the grouting module; S2: Detecting the temperature of soil before reinforcement T and compared with the temperature range of inhibiting biomineralization reaction T 1, T 2] If T < T 1, the soil is warmed up to T 1, T 2] by the heat pump unit. If T ∈[ T 1, T 2], directly S3 to the soil grouting; If T > T 2, then the soil is cooled by the heat pump unit to T 1, T 2]. wherein, T 1 is the temperature of inactivation of the bacterial species, T 2 is the temperature of inhibition of the biomineralization reaction; The method of heating the soil through the heat pump unit is as follows: controlling the pile end valve and the grid end valve, so that the heat exchange buried pipe of the energy pile is connected to the hot side channel of the evaporator through the pile end evaporator circulation pipe, and the heat regulation grid is connected to the cold side channel of the condenser through the grid end condenser circulation pipe. The method of cooling the soil through the heat pump unit is as follows: control the pile end valve and the grid end valve so that the heat exchange buried pipe of the energy pile is connected to the cold side channel of the condenser through the pile end condenser circulation pipe, and the heat regulation grid is connected to the hot side channel of the evaporator through the grid end evaporator circulation pipe. S3: the soil temperature reaches the temperature range inhibiting the biomineralization reaction T 1, T 2] After holding the temperature, the grouting module is started, the bacteria solution and the cementing solution are sprayed into the soil in sequence and repeated, and a certain time interval is set between the spraying of the bacteria solution and the cementing solution to allow the slurry to fully infiltrate; when the slurry penetrates to the expected reinforcement depth, the slurry spraying is stopped; S4: The soil temperature detected in S2 T Temperature range that promotes biomineralization reaction [ T 3, T 4] Comparison: like T < T 3. The soil is heated to [temperature] by the heat pump unit. T 3, T 4]; like T ∈[ T 3, T 4], then the soil is heated to [temperature] using ambient temperature or through the heat pump unit. T 3, T 4]; like T > T 4. Then reduce the power of the heat pump unit to continue cooling the soil through the heat pump unit to [ T 3, T 4]; in, T 3. To promote biomineralization reactions, high temperatures are required. T 4. To suppress the high temperature of biomineralization reaction; S5, Soil temperature reaches the temperature range that promotes biomineralization reaction. T 3, T 4] After heat preservation, when the biomineralization reaction stops, the thermal control module is turned off; S6. Test the soil reinforcement effect. If it does not meet expectations, repeat S2~S5. Finally, spray the surface of the slope with bacterial solution and cementing solution for surface reinforcement.

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