Prefabricated counterfort type ecological retaining wall based on microbial mineralization and UHPC and construction method

Abstract

The invention discloses a prefabricated buttress type ecological retaining wall based on microbial mineralization and UHPC and a construction method, and belongs to the technical field of geotechnical engineering and ecological protection. The retaining wall aims to solve the problems that an existing retaining wall is difficult to give consideration to ecological property and structural performance, insufficient in durability and single in function. The retaining wall comprises a retaining wall body prefabricated by ultra-high performance concrete, the retaining wall body comprises a wall panel, a buttress and a base plate, the buttress is connected with the rear side of the wall panel, and a green planting groove is formed in the wall panel; the ultra-high performance concrete is doped with a microbial agent and a nutrient source, so that the ultra-high performance concrete has self-repairing capability; the back side of the retaining wall body is backfilled with backfilled soil which is reinforced in a layered mode through the microorganism-induced calcium carbonate precipitation technology, and a microorganism mineralization reinforcing area is formed. The retaining wall has the advantages of high performance, self-repairing, ecological reinforcement and structural stability, and is suitable for projects such as stations, roads, side slopes and the like.

Description

Technical Field

[0001] This invention relates to the fields of geotechnical engineering and ecological protection technology, and in particular to prefabricated buttress-type ecological retaining walls based on microbial mineralization and UHPC and their construction methods. Background Technology

[0002] In the construction of railway stations, roadbeds, slopes, and other engineering projects, retaining walls are often required to address differences in terrain elevation. Traditional retaining walls are mostly constructed using cast-in-place concrete or rubble masonry, which has problems such as long construction periods, heavy weight, poor ecological benefits, susceptibility to cracking, and high maintenance costs.

[0003] Although precast buttress retaining walls and ecological retaining walls have emerged in existing technologies, the following shortcomings still exist: 1. It is difficult to balance ecological performance and structural performance, and structural strength and durability are often sacrificed in order to increase green space; 2. Concrete structures are prone to deterioration in harsh environments, and the self-healing ability of cracks is insufficient, limiting their service life; 3. Their functions are singular, mainly focusing on the supporting role, with insufficient consideration for carbon sequestration and emission reduction, intelligent monitoring, etc.; 4. The ease of construction needs to be improved, and there is still room for optimization in the node connection of precast structures and the integrated design of ecological functions.

[0004] Microbial induced calcium carbonate precipitation (MICP) is an emerging biomineralization technology that can cement loose soil and improve soil strength; ultra-high performance concrete (UHPC) has extremely high strength, toughness and durability. Summary of the Invention

[0005] The technical problem to be solved and the technical task proposed by this invention is to improve and refine existing technical solutions, and to provide a prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC, as well as a construction method, to achieve the goals of structural support, ecological greening, self-repair, durability, and carbon sequestration and emission reduction of the retaining wall. To this end, this invention adopts the following technical solution.

[0006] A prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC includes a wall body composed of multiple prefabricated retaining wall bodies made of ultra-high performance concrete (UHPC), wall columns located at the top of the wall body, and backfill soil located behind the retaining wall body. Each retaining wall body includes a wall panel, a base plate, and several buttresses. The buttresses are vertically arranged behind the wall panel, and the wall panel and buttresses are vertically arranged on the top of the base plate. Multiple greening planting troughs are arranged vertically and horizontally on the retaining walls on both the left and right sides of the buttresses. The ultra-high performance concrete of the retaining wall body is uniformly mixed with freeze-dried microbial inoculant powder and microbial nutrient source. The backfill behind the main body of the retaining wall is reinforced with layered soil through microbial-induced calcium carbonate precipitation (MICP) technology, forming a microbial mineralization reinforcement zone.

[0007] By organically combining the high performance of UHPC, the self-healing and soil reinforcement of MICP technology, the convenience of prefabrication and assembly, and the ecological greening function, the contradiction between the ecological nature, durability and structural performance of traditional retaining walls is fundamentally solved. This achieves the integrated function of retaining walls in terms of structural support, ecological greening, self-healing, long-term durability and carbon sequestration and emission reduction, thus ensuring the long-term stability, safety and environmental protection of the structure.

[0008] As a preferred technical approach, a keyway is provided on the base plate below the bottom of the wall panel. The bottom of the wall panel is inserted into the keyway, or the bottom of the wall panel is matched with the keyway by a downwardly protruding elongated key. This structure achieves precise positioning and reliable connection between the wall panel and the base plate, enhances the shear resistance of the joint, improves the overall stability, and is simple and quick to construct.

[0009] As a preferred technical approach: a grouting groove is provided on the base below the bottom of the buttress, and multiple sunken anchor bolt holes are arranged at the bottom of the grouting groove. Pre-embedded anchor bolts are arranged at the bottom of the buttress corresponding to the positions of the anchor bolt holes. Gravity mortar is filled into the grouting groove and the anchor bolt holes. The grouting groove and the anchor bolt holes, together with the gravity mortar injection, ensure a firm anchorage between the buttress and the base, resulting in high connection strength, good durability, and strong adaptability to uneven settlement.

[0010] As a preferred technical approach, the microbial nutrient source includes urea and calcium salt, wherein the calcium salt is calcium nitrate, and the fiber volume content in the ultra-high performance concrete is not less than 2%. The clearly defined microbial nutrient source and fiber content ensure the self-healing potential and high toughness of the UHPC material, improving the crack resistance and durability of the structure.

[0011] As a preferred technical approach, the retaining wall body is pre-embedded with various sensors for monitoring wall displacement, stress, tilt, and temperature data. These sensors are connected to a remote monitoring platform via data acquisition and wireless transmission modules. The pre-embedded sensors and wireless data transmission enable real-time, remote, and intelligent monitoring and early warning of the retaining wall's health status, facilitating timely maintenance, improving project safety, and reducing operation and maintenance costs.

[0012] As a preferred technical means, the rear side of the wall panel is provided with connecting tenons or connecting holes for connecting with anchor rods or reinforcing materials in the rear slope. Connecting with anchor rods or reinforcing materials in the rear slope through tenons or pre-drilled holes significantly enhances the integrity of the retaining wall and the slope, improves anti-overturning and anti-sliding stability, and is particularly suitable for high slope projects.

[0013] As a preferred technical means, the left and right sides of the wall panel are provided with corresponding concave-convex matching structures or pre-embedded corresponding connecting metal structures. Through the concave-convex structures or pre-embedded metal parts on both sides of the wall panel, the tight splicing between adjacent retaining wall bodies is ensured, resulting in good integrity and effectively preventing misalignment and cracking caused by uneven settlement.

[0014] As a preferred technical approach: the top of the retaining wall body is provided with a cup-shaped foundation, and the upper wall columns are installed on the cup-shaped foundation. The cup-shaped foundation reserved at the top of the wall allows for quick, accurate, and secure installation of the upper wall columns, realizing the integrated design and construction of the retaining structure and auxiliary structures, saving procedures and materials.

[0015] A construction method for a precast buttress-type ecological retaining wall based on microbial mineralization and UHPC includes the following steps: 1) Factory prefabrication: According to the design, UHPC mixture mixed with microbial agents and nutrient sources is poured into the mold to prefabricate the main components of the retaining wall, including wall panels, buttresses and base plates. 2) Excavation and foundation treatment: Excavate the foundation pit on site and compact or reinforce the foundation. 3) Component hoisting and assembly: Use lifting equipment to transport the precast retaining wall panel components to the site. First, put the base into the foundation pit and align it. Then, install the wall panels and buttresses in place. During installation, adjacent wall panels are fixed together by a mortise-and-tenon matching structure or a pre-embedded metal connection structure. The bottom of the wall panel and the keyway are mortise-and-tenon matched. The grouting groove and anchor bolt holes under the buttress are filled with gravity mortar through the exposed grouting groove at the lower rear side of the buttress. The gravity mortar is used to fix the buttress to the base. 4) Connection and fixing of wall panel to slope: The anchor rods or reinforcing materials in the rear slope are connected and fixed to the connecting tenons or connecting holes on the back side of the wall panel; 5) Layered backfilling and MIP reinforcement: Layered backfilling is carried out on the back side of the main retaining wall, and microbial reinforcement liquid is sprayed simultaneously on each layer to reinforce the backfill soil with MIP and form a microbial mineralization reinforcement zone. 6) Ecological greening implementation: Backfill the greening planting troughs with planting soil and plant suitable plants to form a three-dimensional greening; 7) Intelligent system installation and debugging: Connect the sensors embedded in the components and connect them to the data acquisition and wireless transmission module to complete data collection and wireless output debugging; 8) Construction of the top auxiliary structure: Install the wall columns in the cup-shaped foundation reserved at the top of the wall, and complete the construction of the upper wall.

[0016] This method integrates factory prefabrication, on-site assembly, MICP in-situ soil reinforcement, ecological greening, and intelligent system installation. The process is clear and seamless, achieving efficient, green, and intelligent construction, significantly shortening the construction period, and reducing on-site wet work and construction waste.

[0017] As a preferred technical means: In step 5), the microbial reinforcement solution contains a solution of urea and calcium salts. This ensures that the MICP reaction is efficient and complete, effectively cementing the backfill soil particles and significantly improving the strength and erosion resistance of the backfill soil.

[0018] Beneficial effects: 1. Superior performance and long-term stability: Using UHPC as the main material, the retaining wall is endowed with extremely high strength, toughness and durability; combined with the backfill soil reinforced by MIP technology, a high-strength, erosion-resistant microbial mineralization reinforcement zone is formed, which together ensures the long-term stability and safety of the structure.

[0019] 2. Intelligent self-healing and low maintenance: The microbial agent premixed in UHPC can be activated when microcracks occur in the structure, inducing calcium carbonate precipitation to automatically repair the cracks, significantly improving the structure's self-healing ability and durability, and greatly reducing the maintenance cost throughout the entire life cycle.

[0020] 3. Eco-friendly and low-carbon emission reduction: The three-dimensional greening planting troughs set in the retaining wall improve the ecological environment; at the same time, the MIP solidification process and the UHPC cementitious material hydration process can fix carbon dioxide, realizing the "negative carbon" or "low carbon" of the project, with significant environmental benefits.

[0021] 4. Rapid Construction and Intelligent Operation & Maintenance: The fully prefabricated assembly construction method facilitates convenient on-site assembly, significantly shortening the construction period and reducing environmental pollution and resource consumption. An intelligent monitoring system integrating multiple sensors enables real-time sensing and remote early warning of wall displacement, stress, tilt, and other conditions, enhancing the intelligence and safety of project management.

[0022] 5. Multifunctional and highly integrated: It innovatively integrates retaining structure, ecological greening, self-repair system, intelligent monitoring and wall foundation into one, with a compact structure and high comprehensive benefits. It is especially suitable for elevation difference treatment projects such as stations, highways and slopes with high requirements for landscape, environmental protection and intelligence. Attached Figure Description

[0023] Figure 1 This is an exploded view of the retaining wall in this invention.

[0024] Figure 2 This is the present invention. Figure 1 Schematic diagram of gravity mortar grouting in section A.

[0025] In the diagram: 1. Base plate; 2. Wall panel; 3. Buttress; 101. Keyway; 102. Grouting groove; 103. Anchor bolt hole; 201. Green planting trough; 301. Anchor bolt. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1 This embodiment provides a prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC. The retaining wall is assembled from multiple modular retaining wall bodies arranged along a straight line or curve on the construction site, and each retaining wall body is an independent prefabricated component.

[0028] like Figure 1-2 As shown, a single retaining wall consists of three main parts: base plate 1, wall panel 2, and buttress 3.

[0029] The base plate 1 is a horizontally placed foundation component. Its function is to expand the base area, evenly distribute the upper load, and serve as the mounting base for the upper wall panel 2 and buttress 3. The upper surface of the base plate 1 has mutually perpendicular keyways 101 and grouting grooves 102, corresponding to the horizontal layout of the wall panel 2 and buttress 3. The keyway 101 is a long, narrow groove used for precise engagement with the bottom of the wall panel 2. The grouting groove 102 is a long, rectangular groove with multiple recessed anchor bolt holes 103 spaced along its length at the bottom.

[0030] The wall panel 2 is an upright, elongated, plate-like structure, designed to directly bear the soil pressure behind the wall. The bottom of the wall panel 2 is connected to the keyway 101 on the base plate 1 via a "plug-in" connection, meaning the lower end of the wall panel 2 is directly inserted into the keyway 101. This connection method allows for quick positioning and effectively resists horizontal shear forces. Several buttresses 3 are vertically installed on the rear side of the wall panel 2, facing the backfill. The buttresses 3 are ribs extending rearward perpendicular to the wall panel 2, their main function being to enhance the bending stiffness of the wall panel 2 and transfer the soil pressure to the base plate 1. Anchor bolts 301 extending downwards are pre-embedded at the bottom of the buttresses 3. During installation, the anchor bolts 301 at the bottom of the buttresses 3 are aligned with the corresponding anchor bolt holes 103 on the base plate 1, so that the buttresses 3 are positioned on the grouting groove 102. Furthermore, based on the dimensional requirements for wall panel manufacturing and transportation, in this embodiment, three buttresses are arranged parallel to each wall panel 2 on its rear side to enhance the supporting structure.

[0031] All components of the retaining wall, including the base plate 1, wall panel 2, and buttress 3, are prefabricated using ultra-high performance concrete (UHPC). In this embodiment, the UHPC mix proportion, in addition to conventional cement, silica fume, quartz sand, high-efficiency water-reducing agent, and steel fiber with a volume fraction of not less than 2%, also uniformly incorporates freeze-dried microbial agents such as Bacillus pasteurellii and nutrient sources including urea and calcium nitrate. These bioactive components are uniformly dispersed during concrete mixing. When microcracks develop in the structure due to load or environmental factors during service and water intrusion occurs, the dormant microorganisms are activated, using urea and calcium ions to induce the formation of calcium carbonate crystals, thereby achieving self-repair of the microcracks and significantly improving the durability of the structure.

[0032] In the wall panel 2 area between two adjacent buttresses 3, multiple greening planting troughs 201 are regularly arranged in the vertical and horizontal directions. These planting troughs are prefabricated as a single piece to accommodate planting soil and plant roots, thus creating vertical greening.

[0033] After the main retaining wall is installed, layers of sand or graded crushed stone are backfilled behind it. After each layer, a reinforcement solution containing microbial inoculum, urea, and calcium salts is sprayed simultaneously. Utilizing microbial-induced calcium carbonate precipitation (MICP) technology, the microorganisms in the reinforcement solution induce calcium carbonate crystals to form between soil particles, binding the loose backfill soil particles into a cohesive whole. This creates a high-strength, low-permeability microbial mineralization reinforcement zone behind the retaining wall. This reinforcement zone not only significantly improves the shear strength and overall stability of the backfill soil but also effectively resists rainwater erosion.

[0034] The retaining wall also has various sensors pre-embedded inside, such as strain gauges, inclinometers, and temperature sensors, to monitor the wall's stress, deformation, tilt, and temperature in real time. These sensors are connected via cables to a data acquisition and wireless transmission module installed outside the wall, wirelessly transmitting data to a remote monitoring platform for intelligent operation and maintenance and early warning.

[0035] The rear side of wall panel 2 can be pre-drilled with connection holes or set with connecting tenons as needed for the project, for connecting with anchor rods or geosynthetic reinforcement materials in the rear slope, further enhancing the overall stability of the retaining wall and the slope. On the left and right sides of wall panel 2, tongue-and-groove connection structures with matching concave and convex shapes can be set so that adjacent retaining wall bodies can be tightly spliced ​​together, ensuring the integrity of the wall.

[0036] The top of the retaining wall is prefabricated with multiple cup-shaped foundations. During construction, the columns of the upper retaining wall are directly inserted into the cups, and then high-strength, non-shrink grout is poured in to fix them, thus achieving integrated construction of the retaining structure and the upper retaining wall foundation.

[0037] The construction method of this embodiment includes the following steps: S1: Factory Prefabrication: Based on the design drawings, UHPC mixture containing microbial agents and nutrient sources is poured into the factory using specialized steel molds to prefabricate components such as base plate 1, wall panel 2, and buttress 3. During the pouring process, various sensors, cables, anchor bolts 301, etc., are simultaneously pre-embedded. After demolding, the components are cured under standard conditions to the specified strength.

[0038] S2: Excavation and Foundation Treatment: Excavate the foundation pit on-site according to the design elevation and dimensions. Clean up loose soil and debris from the foundation, and compact and level it. If the foundation soil is poor, it is necessary to carry out foundation reinforcement treatment such as replacement, compaction, or pile foundation.

[0039] S3: Component hoisting and assembly: Transporting prefabricated components to the site and hoisting them using lifting equipment such as truck cranes. During hoisting, the base plate 1 is first hoisted to the designed position in the foundation pit and leveled and aligned.

[0040] Then, the wall panel 2 is hoisted and its bottom is precisely inserted into the keyway 101 of the base plate 1.

[0041] Next, the buttress 3 is hoisted and placed on the grouting groove 102 of the base plate 1, ensuring that the pre-embedded anchor bolts 301 at the bottom of the buttress 3 are inserted into the corresponding anchor bolt holes 103.

[0042] After the buttress 3 is installed in place, gravity mortar is poured into the grouting groove 102 exposed at the rear of the buttress 3 until the grouting groove 102 and all anchor bolt holes 103 are completely filled. The fluidity of the gravity mortar and its subsequent strength increase ensure a firm anchorage between the buttress 3 and the base plate 1.

[0043] Repeat the above process to install the adjacent retaining wall structures. Note that adjacent wall panels 2 should be interlocked via a tongue-and-groove joint on their sides.

[0044] S4: Connection and fixing of wall panel 2 to slope: If anchor rods or reinforcing materials are designed, anchor rods are installed or reinforcing materials are laid on the rear slope, and their ends are reliably connected to the pre-reserved tenon or connecting hole connection structure on the rear side of wall panel 2.

[0045] S5: Layered Backfilling and MIP Reinforcement: Layered backfilling is carried out behind the main retaining wall. Each 30cm thick layer of sand or graded crushed stone is followed by a uniform spraying of a microbial reinforcement solution. The main components of the solution are urea, calcium nitrate, and bacterial solution. After spraying, the soil is covered and cured to maintain moisture, allowing the MIP reaction to fully occur and cement the soil layer. This process is repeated until the backfill reaches the design elevation, thus forming a unified microbial mineralization reinforcement zone behind the wall, reinforced using MIP technology.

[0046] S6: Ecological greening implementation: Backfill all greening planting troughs 201 with planting soil suitable for plant growth, and plant selected suitable shrubs, vines or herbaceous plants to form a three-dimensional greening surface.

[0047] S7: Intelligent System Installation and Debugging: Connect each pre-embedded sensor to the data acquisition and wireless transmission module in the data acquisition box through the cable interface reserved in the main body of the retaining wall, turn on the power, and conduct system joint debugging to ensure that the data of each sensor can be accurately acquired and stably transmitted to the remote monitoring center through the wireless network.

[0048] S8: Construction of Top Ancillary Structures: Insert wall columns into the pre-reserved cup-shaped foundation at the top of the retaining wall, correct the verticality, and then inject high-strength grout into the cup-shaped foundation. After the grout reaches its strength, install the wall's beams, railings, or guardrails to complete all construction.

[0049] Example 2 The difference between this embodiment and Embodiment 1 lies in the connection method between the wall panel 2 and the base plate 1. In this embodiment, the bottom of the wall panel 2 is not directly inserted into a keyway, but rather has a pre-fabricated elongated key that protrudes downwards. Correspondingly, a keyway 101 matching the shape and size of this elongated key is pre-fabricated on the base plate 1. During installation, the elongated key at the bottom of the wall panel 2 is aligned and embedded into the keyway 101 of the base plate 1. This "mortise and tenon" connection provides better shear and pull-out resistance, and is especially suitable for applications requiring higher performance of the connection nodes.

[0050] Example 3 The difference between this embodiment and Embodiment 1 or 2 lies in the lateral connection method between adjacent wall panels 2. In this embodiment, instead of providing tongue and groove joints on the sides of the wall panels 2, metal connectors are pre-embedded at specific positions on both the left and right sides. After being hoisted into place on the construction site, the corresponding metal connectors on the adjacent wall panels 2 are fastened together.

[0051] The above-described specific embodiments of the present invention demonstrate the outstanding substantive features and significant progress of the present invention. Based on the actual needs of use, equivalent modifications in shape, structure, etc., can be made to the present invention, and all such modifications are within the scope of protection of this solution.

Claims

1. A prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC, characterized in that: It includes a wall composed of multiple precast retaining wall bodies made of ultra-high performance concrete (UHPC), a retaining wall column located on top of the wall, and backfill soil located behind the retaining wall body. Each retaining wall body includes a wall panel, a base plate, and several buttresses. The buttresses are vertically installed behind the wall panel, and the wall panel and buttresses are vertically installed on top of the base plate. Multiple greening planting troughs are arranged vertically and horizontally on the retaining walls on both the left and right sides of the buttresses. The ultra-high performance concrete of the retaining wall body is uniformly mixed with freeze-dried microbial inoculant powder and microbial nutrient source. The backfill behind the main body of the retaining wall is reinforced with layered soil through microbial-induced calcium carbonate precipitation (MICP) technology, forming a microbial mineralization reinforcement zone.

2. The precast buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The base plate has a keyway located below the bottom of the wall panel. The bottom of the wall panel is inserted into the keyway, or the bottom of the wall panel is matched with the keyway by a downward-protruding long key.

3. The precast buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The base is provided with a grouting groove below the bottom of the buttress. Multiple sunken anchor bolt holes are arranged at the bottom of the grouting groove. Pre-embedded anchor bolts are arranged at the bottom of the buttress corresponding to the positions of the anchor bolt holes. Gravity mortar is filled into the grouting groove and the anchor bolt holes.

4. The precast buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The microbial nutrient source includes urea and calcium salt, wherein the calcium salt is calcium nitrate, and the fiber volume content in the ultra-high performance concrete is not less than 2%.

5. A prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The retaining wall is pre-embedded with various sensors for monitoring wall displacement, stress, tilt and temperature data. The sensors are connected to a remote monitoring platform through a data acquisition and wireless transmission module.

6. The precast buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The rear side of the wall panel is provided with a connecting tenon or connecting hole for connecting to anchor rods or reinforcing materials in the rear slope.

7. A prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The wall panel has corresponding concave and convex matching structures on its left and right sides or has corresponding metal connection structures pre-embedded.

8. A prefabricated buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 1, characterized in that: The main body of the retaining wall is provided with a cup-shaped foundation at the top, and the wall columns of the upper wall are set on the cup-shaped foundation.

9. A construction method for a precast buttress-type ecological retaining wall based on microbial mineralization and UHPC as described in any one of claims 1-8, characterized in that... Includes the following steps: 1) Factory prefabrication: According to the design, UHPC mixture containing microbial agents and nutrient sources is poured into molds to prefabricate the main components of the retaining wall, including wall panels, buttresses and base plates. 2) Excavation and foundation treatment: Excavate the foundation pit on site and compact or reinforce the foundation. 3) Component hoisting and assembly: Use lifting equipment to transport the precast retaining wall panel components to the site. First, put the base into the foundation pit and align it. Then, install the wall panels and buttresses in place. During installation, adjacent wall panels are fixed together by a mortise-and-tenon matching structure or a pre-embedded metal connection structure. The bottom of the wall panel and the keyway are mortise-and-tenon matched. The grouting groove and anchor bolt holes under the buttress are filled with gravity mortar through the exposed grouting groove at the lower rear side of the buttress. The gravity mortar is used to fix the buttress to the base. 4) Connection and fixing of wall panel to slope: The anchor rods or reinforcing materials in the rear slope are connected and fixed to the connecting tenons or connecting holes on the back side of the wall panel; 5) Layered backfilling and MIP reinforcement: Layered backfilling is carried out on the back side of the main retaining wall, and microbial reinforcement liquid is sprayed simultaneously on each layer to reinforce the backfill soil with MIP and form a microbial mineralization reinforcement zone. 6) Ecological greening implementation: Backfill the greening planting troughs with planting soil and plant suitable plants to form a three-dimensional greening; 7) Intelligent system installation and debugging: Connect the sensors embedded in the components and connect them to the data acquisition and wireless transmission module to complete data collection and wireless output debugging; 8) Construction of the top auxiliary structure: Install the wall columns in the cup-shaped foundation reserved at the top of the wall, and complete the construction of the upper wall.

10. The construction method of a precast buttress-type ecological retaining wall based on microbial mineralization and UHPC according to claim 9, characterized in that: In step 5), the microbial consolidation solution comprises a solution of urea and calcium salts.

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