Cutting section landslide treatment method and structure based on steel corrugated plates

Abstract

The invention relates to the technical field of landslide disaster treatment, and discloses a cutting section landslide treatment method and structure based on a steel corrugated plate, which adopts an innovative combined structure of the steel corrugated plate and a reinforced concrete lining to realize advantage complementation of flexibility and rigidity; wherein the steel corrugated plate can effectively resist external soil pressure and flexibly absorb settlement deformation of a foundation by virtue of extremely high axial compressive strength and excellent deformation adaptive capacity, and meanwhile, the steel corrugated plate is used as a supporting template of a concrete structure, so that the aim of quickly implementing protection is fulfilled; the reinforced concrete lining greatly improves the overall rigidity and the shear strength of the structure, and the problem that a pure steel structure is prone to local instability is fundamentally avoided; and the two synergistically form a strong retaining system, so that the treatment effect is lasting and stable, and potential safety hazards are thoroughly solved.

Description

Technical Field

[0001] This invention relates to the field of landslide disaster control technology, specifically to a method and structure for controlling landslides in road cut sections based on corrugated steel plates. Background Technology

[0002] In railway and highway engineering construction, the stability of slopes in cut sections directly affects the overall safety and long-term operation of the project, making it a core aspect that must be carefully controlled during construction. However, due to complex geological conditions, the long-term effects of groundwater, the unloading effect of excavation, and repeated rainfall erosion, cut slopes are highly susceptible to landslides. More importantly, these landslides often exhibit recurring characteristics, posing a serious threat to normal railway operation and significantly increasing the difficulty of remediation, thus presenting a significant challenge to project maintenance. For a long time, the industry has mainly used traditional methods to treat landslides on road cut slopes, but these methods all have obvious limitations in practical applications: Anti-slide piles: As a common deep reinforcement method, they are not only costly but also have a long construction period. During construction, large-scale excavation of the slope is required, causing significant disturbance to the original slope structure. Especially when construction is carried out near existing railway lines, it can severely disrupt the normal operation of railways or highways, posing significant safety risks. More importantly, under complex geological conditions (such as fractured rock layers or water-rich strata), the anchoring effect of anti-slide piles is difficult to guarantee, potentially leading to incomplete treatment and the risk of recurrence.

[0003] Retaining walls, including gravity retaining walls and anchored retaining walls, require deep foundation excavation for construction. Their construction covers a wide area and also presents challenges such as long construction periods and significant traffic disruption. Furthermore, retaining walls are mostly rigid structures, lacking sufficient deformation adaptability under long-term pressure from the slope soil. They are prone to cracking, displacement, and even brittle failure, failing to meet the dynamic deformation requirements of the slope.

[0004] Anchored frame beams: This method requires high integrity and strength of the slope's soil and rock mass. In loose deposits, weathered rock layers, or water-rich strata, the anchoring force of the anchors will decrease significantly, making it difficult to achieve the expected reinforcement effect. At the same time, laying the frame beams requires large-scale excavation of the slope, which may further disrupt the original balance of the slope and increase the risk of slope instability. For existing railway or highway lines, the drawbacks of traditional landslide mitigation methods are even more pronounced. During mitigation, speed limits or even temporary closures are often necessary, severely impacting traffic efficiency and causing significant economic losses (such as transportation disruptions and increased construction costs), while also triggering adverse social impacts (such as inconvenience for the public and logistical delays). Therefore, the industry urgently needs a new landslide mitigation technology that enables rapid construction, minimizes disruption to traffic, possesses good deformation adaptability, and delivers thorough mitigation results to overcome the current challenges in roadbed slope management. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for landslide control in road cut sections based on corrugated steel plates.

[0006] According to one aspect of the present invention, a road cut landslide control structure based on corrugated steel plates is provided, comprising multiple corrugated steel plates, which are sequentially connected to form an arched cavity. The arched cavity is installed on a reinforced concrete foundation, and multiple positioning levers are adjustablely fixedly installed inside the lower side of the arched cavity, with nuts provided at both ends of the positioning levers.

[0007] Furthermore, adjacent corrugated steel plates are bolted together, and polyethylene foam boards are pasted at the joint.

[0008] Furthermore, the positioning lever is a rod with a smooth middle and external threads at both ends.

[0009] According to another aspect of the present invention, a method for landslide control in road cut sections based on corrugated steel plates is provided, characterized by comprising the following steps: S1. Construction preparation: Conduct an investigation of the landslide body to determine the sliding surface range and treatment area; clear the slope toe to eliminate unstable surface soil and level the construction site. The width of the hoisting side site must meet the requirements for the overall transportation and hoisting of the corrugated steel plates. S2. Foundation construction: Excavate the foundation pit according to the design drawings, adopt foundation reinforcement measures such as replacement for weak foundations, and pour reinforced concrete foundations. S3. Install corrugated steel plates: Transport the processed corrugated steel components to the site and assemble them ring by ring from one side according to the design drawings; S4. Pouring lining concrete: Tie steel mesh to the outside of the installed corrugated steel plate and pour a layer of reinforced concrete lining. S5. Symmetrical backfilling on both sides: After the lining concrete reaches the design strength, concrete is used for backfilling. After the backfill concrete reaches the design strength, the gap between it and the landslide body behind it is filled with graded sand and gravel and soil and rock in layers, symmetrically backfilled and compacted to form a compacted backfill body, providing lateral restraint. S6. Drainage system setup and surface restoration: A culvert and drainage hole are set at the bottom of the backfilled concrete body to introduce groundwater in the landslide body into the culvert through a gravel filter layer for unified discharge; the entrance and exit are made of soil slope, and a concrete retaining wall and drainage hole are set at the toe of the slope. The slope is restored using concrete frame slope protection measures.

[0010] Furthermore, S2 specifically refers to: S21. Excavation of the foundation pit is carried out using manual labor in conjunction with excavators and hydraulic breakers; S22. Pour reinforced concrete foundation. The bottom of the foundation is treated with Φ120mm concrete piles. The concrete is poured by drilling down-the-hole drill. After the hole is cleaned with an air compressor, the steel cage is put down and the concrete is poured in time. S23. After the foundation construction is completed, chemical bolts will be drilled on the top surface of the foundation at the designed positions. The drilling positions will be strictly controlled to ensure the accurate positioning of the corrugated steel plates in the later stage.

[0011] Furthermore, S3 specifically refers to: S31. Assemble the corrugated steel plates from one side according to the design drawings to form an arched tunnel. After each ring is assembled, the cross-sectional shape must be measured. If it meets the standard, continue assembling. If it does not meet the standard, adjustments must be made. S32. When assembling the circumferential assembly into the ring, measure the cross-sectional shape and use positioning levers to fix it; S33. Based on the size of the corrugated steel sheet and the conditions for hoisting, transportation and assembly, each three rings constitute an assembly and hoisting unit. After the corrugated steel pipe assembly unit is completed, a positioning lever is installed inside. It is then transported by a flatbed truck to the rear of the crane for hoisting. After each unit is hoisted, the lower edge dimension needs to be measured. If deformation occurs, the dimension is adjusted using the positioning lever to ensure the unit dimension. S34. Use a crane to hoist the unit as a whole to the predetermined position, and use chemical bolts to firmly anchor the angle steel to the bottom concrete foundation. Hoist the next unit to the rear end of the previous unit in sequence. Each hoisted unit is assembled by flange docking to form a complete arched tunnel structure. After hoisting, prevent any deviation, and the measurement team will check and verify.

[0012] Furthermore, S4 specifically involves: binding a double-layer steel mesh of Φ20@200mm to the outside of the corrugated steel plate, installing hook bars between the two layers of steel bars, and then setting up a formwork. The formwork is made of wood and reinforced with shear nails pre-reserved on the outside of the corrugated steel plate. Vibration holes are reserved during pouring to ensure that the concrete is dense.

[0013] Furthermore, S5 specifically refers to: after the lining concrete reaches the design strength, C25 concrete is used for backfilling within a 4m wide and 2m high range above the tunnel foundation. Drainage culverts are set up in the backfill concrete in conjunction with the roadbed drainage, and the slope ratio of the backfill side slope is controlled at 1:0.5. After the concrete has been poured for 5-7 days and has reached more than 70% of its design strength, backfilling with graded sand and gravel can begin. Within a 2m high gap between the landslide body and the rear landslide body, graded sand and gravel were used for layered, symmetrical backfilling and compaction. Before backfilling the earthwork, complete the construction of waterproof membrane and cement blanket according to the design requirements; Areas above 2m in height and the arch top are all backfilled with soil and rock to form a compacted backfill body; Small machinery was used to compact the soil within 1.0m of the structure, and the thickness of the layered filling was appropriately reduced to reduce the lateral pressure of the backfill structure on the tunnel structure. The backfilling process continues until the gaps on both sides of the landslide are completely filled, creating effective counterpressure on the landslide.

[0014] Furthermore, S6 specifically involves: burying drainage pipes with a diameter of D=50 at the bottom of the foundation and at the junction of the backfill and the landslide body to introduce groundwater within the landslide body into a drainage culvert for unified discharge through a gravel filter layer and drainage pipes; using earthen slopes at the entrances and exits, with concrete retaining walls and drainage holes at the toe of the slope, controlling the slope gradient at 1:1.5, and restoring the slope using concrete frame slope protection measures.

[0015] Furthermore, the method for installing the positioning lever is as follows: First, after assembling each three-ring plate into a unit at the assembly site, multiple positioning levers are symmetrically installed inside the underside of the corrugated steel plate using the holes of shear nails. These levers are then fixed to the troughs of the corrugated plate with nuts to form temporary rigid supports and prevent deformation during transportation and hoisting. After the unit is hoisted to the installation position, surveyors measure its lower edge dimensions, elevation, and cross-sectional shape, comparing them with the design values. If dimensional deviations are found, they are corrected by rotating the adjusting bolts of the levers at specific positions. If the chord length is found to be too small and needs to be increased, the bolts are rotated to make the seamless steel pipe push the assembled unit corrugated steel plate, increasing the chord length. If the chord length is too large, the bolts are rotated in the opposite direction to make the seamless steel pipe pull the assembled unit corrugated steel plate, decreasing the chord length. The adjustment process strictly follows the principle of "micro-scale multiple adjustments, synchronous symmetry," and is dynamically adjusted based on measurement data. Once the dimensions meet the requirements, immediately tighten the bolts and complete the foundation anchoring and inter-unit flange connection. Finally, remove the positioning levers for reuse.

[0016] The beneficial effects of this invention are as follows: 1. This invention employs an innovative combined structure of "corrugated steel plate + reinforced concrete lining," achieving a complementary advantage of flexibility and rigidity. The corrugated steel plate, with its extremely high axial compressive strength and excellent deformation adaptability, effectively resists external earth pressure and flexibly absorbs foundation settlement deformation. The reinforced concrete lining significantly enhances the overall structural stiffness and shear strength, fundamentally avoiding the local instability problems prone to occur in pure steel structures. Together, they form a robust support system, ensuring a long-lasting and stable treatment effect and completely resolving potential safety hazards.

[0017] 2. The core components of this invention are all prefabricated in a standardized factory, ensuring precise and controllable quality and significantly simplifying the on-site construction process—only two key steps need to be completed on-site: component assembly and concrete pouring. Compared to traditional construction methods, the construction speed is increased several times, making it particularly suitable for emergency rescue scenarios in geological disasters. It can quickly control the danger, restore site safety, and buy valuable time for disaster relief.

[0018] 3. The entire construction process of this invention is strictly limited to the area at the toe of the road cut slope, without occupying existing traffic lanes or causing any interference with normal traffic order. This "non-disturbing and non-obstructing" construction mode minimizes safety risks during construction and avoids economic losses caused by traffic interruptions, highlighting both safety assurance and socio-economic benefits.

[0019] 4. Compared with traditional treatment methods such as anti-slide piles and large retaining walls, this solution uses fewer materials, has lower labor and machinery costs, and significantly shortens the construction period, effectively reducing indirect costs such as site rental, management, and maintenance. It optimizes costs from multiple dimensions—materials, labor, and time—resulting in a significant overall cost advantage and saving substantial funds for the project.

[0020] 5. After construction is completed, the site vegetation cover can be quickly restored through backfilling, without long-term occupation or damage to the surrounding ecological environment. After vegetation restoration, it blends highly with the original natural landscape, maintaining the regional ecological balance and ensuring visual harmony between the remediation project and the surrounding environment, which is in line with the concept of green engineering construction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view at point A; Figure 3 Flowchart of this invention; Figure 4 This is a cross-sectional schematic diagram of the governance structure of the present invention.

[0022] The labels shown in the attached diagram are: 1. Corrugated steel plate; 2. Reinforced concrete foundation; 3. Positioning lever; 4. Nut. Detailed Implementation

[0023] The present invention will be further described in conjunction with specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0024] like Figure 1 As shown, a road cut landslide control structure based on corrugated steel plates includes multiple corrugated steel plates connected in sequence to form an arched tunnel. The arched tunnel is installed on a reinforced concrete foundation. Multiple positioning levers are adjustable and fixedly installed inside the lower side of the arched tunnel, and nuts are set at both ends of the positioning levers.

[0025] The two adjacent corrugated steel plates are bolted together, and polyethylene foam boards are pasted at the joint.

[0026] The positioning lever is a rod with a smooth middle and external threads at both ends. The positioning lever can be adjusted and fixed to the corrugated steel plate by means of nuts and external thread rods.

[0027] like Figure 2 As shown, a landslide control method for road cut sections based on corrugated steel plates is disclosed, including the following steps: S1. Construction Preparation: Conduct a landslide survey to determine the sliding surface range and treatment area; clear the slope toe to remove unstable surface soil and level the construction site. The width of the site on the hoisting side must meet the requirements for the overall transportation and hoisting of the corrugated steel sheets; install a hard isolation fence on the outside of the railway track bed to prevent construction personnel from entering the track and affecting traffic safety. Use a small excavator to clear the loose material at the slope toe on both sides of the track to form a semi-enclosed working surface; arrange for dedicated personnel to be on duty 24 hours a day to prevent non-working personnel from entering the construction site; set up a corrugated steel sheet assembly area away from the track; the main construction access road is set up on the hoisting side, and the width of the construction access road shall not be less than 8m according to the length of the corrugated steel sheet assembly unit and the crane's turning radius.

[0028] S2. Foundation Construction: The foundation pit will be excavated according to the design drawings. For weak foundations, soil reinforcement measures such as replacement will be adopted, followed by the pouring of reinforced concrete foundations. Specifically, the strip foundation dimensions are 1m × 1.5m. Part of the foundation is located in completely weathered diabase with insufficient bearing capacity; therefore, concrete piles will be used to treat the bottom of the strip foundations. Drilling will be conducted using a down-the-hole drill. After drilling, the hole will be cleaned using an air compressor, and the reinforcing cage will be lowered and concrete poured promptly.

[0029] The foundation pit is excavated using a combination of manual labor, excavators, and hydraulic breakers. The bottom of the foundation pit must be located in a weakly weathered diabase layer. The excavation is carried out in sections with each excavation not exceeding 3m in length and with a spacing of not less than 3m between sections. Temporary lateral supports are used when necessary to prevent the sidewalls of the foundation pit from collapsing due to train passage, which could affect train safety.

[0030] After the foundation construction is completed, chemical bolts are drilled on the top surface of the foundation according to the design position. The drilling position is strictly controlled to ensure the accurate positioning of the corrugated steel plate later.

[0031] S3. Installing Corrugated Steel Sheets: Transport the pre-fabricated corrugated steel components to the site and assemble them ring by ring from one side according to the design drawings. Specifically, use Q355B hot-dip galvanized steel corrugated sheets with a corrugation pitch of 200mm and a corrugation height of 110mm. Each sheet is 2.5-4.5 meters long and 1.5 meters wide. Assemble using a crane and manual labor. The corrugated steel sheets are connected with M24 high-strength bolts. Assemble ring by ring from one side according to the design drawings, attaching polyethylene foam boards to the joints to form a semi-cylindrical structure 6.95 meters high with a chord length of approximately 7 meters. After each ring is assembled, measure the cross-sectional shape. If it meets the standard, continue assembling; otherwise, adjustments are needed. When the circumferential assembly reaches the point where the rings are closed, measure the cross-sectional shape and use positioning levers for fixation. Based on the dimensions of the corrugated steel sheets and the lifting, transportation, and assembly conditions, each assembly and lifting unit consists of three rings. After the corrugated steel pipe assembly units are completed, internal positioning levers are installed. The units are then transported by flatbed truck to the rear of the crane for hoisting. After each unit is hoisted, the lower edge dimensions are measured. If deformation occurs, the positioning levers are used to adjust the dimensions to ensure the unit's size. The crane then hoists the entire unit to the designated position, and chemical bolts are used to firmly anchor the angle steel to the bottom concrete foundation. The next unit is hoisted sequentially to the rear of the previous unit. Each hoisted unit is assembled using flange connections to form a complete arched tunnel structure. After hoisting, to prevent misalignment, the measurement team checks and verifies the work.

[0032] Each hoisting cycle takes approximately 10-15 minutes.

[0033] Positioning levers are key tooling in the installation of corrugated steel sheets. They are mainly composed of Φ50 seamless steel pipes and adjustable bolts. Their core function is to precisely control the structural dimensions after the corrugated steel sheet unit is hoisted into place, ensuring that the design requirements are met. The specific process is as follows: First, after assembling every three rings of sheets into a unit at the assembly site, multiple positioning levers are symmetrically installed inside the underside of the corrugated steel sheet using the holes of shear nails. These levers are fixed to the troughs of the corrugations with nuts, forming temporary rigid supports to prevent deformation during transportation and hoisting. After the unit is hoisted to the installation position, surveyors immediately measure its lower edge dimensions, elevation, and cross-sectional shape, comparing them with the design values ​​(height 6.95 meters, chord length 7 meters). If dimensional deviations are found, they are corrected by rotating the adjusting bolts of the levers at specific positions. When the chord length is found to be too small and needs to be increased, the bolt is rotated to make the seamless steel pipe push the assembled unit steel corrugated plate, thus increasing the chord length. If the chord length is too large, the bolt is rotated in the opposite direction to make the seamless steel pipe pull the assembled unit steel corrugated plate, thus decreasing the chord length. During the adjustment process, the principle of "micro-scale, multiple, synchronous, and symmetrical" is strictly followed, and adjustments are made dynamically based on measurement data. Once the dimensions meet the standards, the bolts are immediately tightened and the foundation anchoring is completed. The flange connections between units are secured, and the positioning levers are eventually removed for reuse. This effectively ensures the assembly accuracy, efficiency, and overall stability of the corrugated steel plate structure.

[0034] S4. Pouring lining concrete: Tie a steel mesh to the outside of the installed corrugated steel plate and pour a layer of reinforced concrete lining; tie a double layer of Φ20@200mm steel mesh to the outside of the corrugated steel plate, then install hook bars between the two layers of steel bars, and then set up the formwork. The formwork is made of wood and reinforced with shear nails reserved on the outside of the corrugated steel plate. During pouring, leave vibration holes to ensure that the concrete is dense.

[0035] S5. Symmetrical Backfilling on Both Sides: After the lining concrete reaches its design strength, backfilling will be carried out using concrete. Once the backfill concrete reaches its design strength, the gap between it and the subsequent landslide body will be filled with graded gravel and soil in layers, symmetrically backfilled and compacted to form a compacted backfill body, providing lateral restraint. The backfill area consists of C25 concrete backfill, graded gravel, and soil backfill. After the lining concrete reaches its design strength, C25 concrete will be used for backfilling within a 4m wide and 2m high area above the tunnel foundation. Drainage culverts will be installed within the backfill concrete in conjunction with the roadbed drainage system. The backfill slope ratio will be controlled at 1:0.5. Graded gravel backfilling will begin 5-7 days after concrete pouring, once it reaches over 70% of its design strength. Within a 2m high gap between it and the subsequent landslide body, graded gravel will be used for layered, symmetrical backfilling and compaction. Before earthwork backfilling, waterproofing membrane and cement blanket construction will be completed according to design requirements. The area above 2m in height and the arch crown were filled with soil and rock to form a compacted backfill. Small machinery was used for compaction within 1.0m of the structural soil, and the thickness of each layer was appropriately reduced to decrease the lateral pressure of the backfill structure on the tunnel structure. The backfilling process continued until the voids on both sides of the landslide were completely filled, creating effective counter-pressure on the landslide.

[0036] S6. Drainage system setup and surface restoration: A culvert and drainage hole are set at the bottom of the backfilled concrete body to introduce groundwater in the landslide body into the culvert through a gravel filter layer for unified discharge; the entrance and exit are made of soil slope, and a concrete retaining wall and drainage hole are set at the toe of the slope. The slope is restored using concrete frame slope protection measures.

[0037] Furthermore, S2 specifically refers to: S21. Excavation of the foundation pit is carried out using manual labor in conjunction with excavators and hydraulic breakers; S22. Pour reinforced concrete foundation. The bottom of the foundation is treated with Φ120mm concrete piles. The concrete is poured by drilling down-the-hole drill. After the hole is cleaned with an air compressor, the steel cage is put down and the concrete is poured in time. S23. After the foundation construction is completed, chemical bolts will be drilled on the top surface of the foundation at the designed positions. The drilling positions will be strictly controlled to ensure the accurate positioning of the corrugated steel plates in the later stage.

[0038] Furthermore, S3 specifically refers to: S31. Assemble the corrugated steel plates from one side according to the design drawings to form an arched tunnel. After each ring is assembled, the cross-sectional shape must be measured. If it meets the standard, continue assembling. If it does not meet the standard, adjustments must be made. S32. When assembling the circumferential assembly into the ring, measure the cross-sectional shape and use positioning levers to fix it; S33. Based on the size of the corrugated steel sheet and the conditions for hoisting, transportation and assembly, each three rings constitute an assembly and hoisting unit. After the corrugated steel pipe assembly unit is completed, a positioning lever is installed inside. It is then transported by a flatbed truck to the rear of the crane for hoisting. After each unit is hoisted, the lower edge dimension needs to be measured. If deformation occurs, the dimension is adjusted using the positioning lever to ensure the unit dimension. S34. Use a crane to hoist the unit as a whole to the predetermined position, and use chemical bolts to firmly anchor the angle steel to the bottom concrete foundation. Hoist the next unit to the rear end of the previous unit in sequence. Each hoisted unit is assembled by flange docking to form a complete arched tunnel structure. After hoisting, prevent any deviation, and the measurement team will check and verify.

[0039] Furthermore, S4 specifically involves: binding a double-layer steel mesh of Φ20@200mm to the outside of the corrugated steel plate, installing hook bars between the two layers of steel bars, and then setting up a formwork. The formwork is made of wood and reinforced with shear nails pre-reserved on the outside of the corrugated steel plate. Vibration holes are reserved during pouring to ensure that the concrete is dense.

[0040] Furthermore, S5 specifically refers to: after the lining concrete reaches the design strength, C25 concrete is used for backfilling within a 4m wide and 2m high range above the tunnel foundation. Drainage culverts are set up in the backfill concrete in conjunction with the roadbed drainage, and the slope ratio of the backfill side slope is controlled at 1:0.5. After the concrete has been poured for 5-7 days and has reached more than 70% of its design strength, backfilling with graded sand and gravel can begin. Within a 2m high gap between the landslide body and the rear landslide body, graded sand and gravel were used for layered, symmetrical backfilling and compaction. Before backfilling the earthwork, complete the construction of waterproof membrane and cement blanket according to the design requirements; Areas above 2m in height and the arch top are all backfilled with soil and rock to form a compacted backfill body; Small machinery was used to compact the soil within 1.0m of the structure, and the thickness of the layered filling was appropriately reduced to reduce the lateral pressure of the backfill structure on the tunnel structure. The backfilling process continues until the gaps on both sides of the landslide are completely filled, creating effective counterpressure on the landslide.

[0041] Furthermore, S6 specifically involves: burying drainage pipes with a diameter of D=50 at the bottom of the foundation and at the junction of the backfill and the landslide body to introduce groundwater within the landslide body into a drainage culvert for unified discharge through a gravel filter layer and drainage pipes; using earthen slopes at the entrances and exits, with concrete retaining walls and drainage holes at the toe of the slope, controlling the slope gradient at 1:1.5, and restoring the slope using concrete frame slope protection measures.

[0042] Example: Taking the landslide treatment of a railway cutting section as an example, the left slope of the railway cutting experienced five landslides between September 2020 and September 2024. The rear edge of the landslides continued to extend towards the rear slope. During the landslides, the leading edge of the landslide body encroached on the existing railway line, causing operational interruptions. Based on the on-site investigation of the landslides and the monitoring of the existing roadbed slope, a new single-track cutting-type corrugated steel plate open-cut structure was added above the existing roadbed. To reduce the interference of the existing line construction on the line and to ensure normal operation, the open-cut structure adopted a cross-section without an inverted arch lining. The arch wall was lined with 60cm thick C35 reinforced concrete, and the bottom of the wall adopted a C35 concrete strip foundation. The inner side of the lining used 200mm×110mm×8mm corrugated steel plates as the inner formwork. The corrugated steel plates were connected to the foundation using 200mm×200mm×16mm angle steel and M24-400, 8.8 grade chemical anchors. The chemical anchors were anchored into the foundation in a post-installation manner.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A landslide control structure for road cut sections based on corrugated steel plates, characterized in that: It includes multiple corrugated steel plates, which are connected in sequence to form an arched cavity. The arched cavity is installed on a reinforced concrete foundation. Multiple positioning levers are adjustable and fixedly installed inside the lower side of the arched cavity, and nuts are set at both ends of the positioning levers.

2. The landslide control structure for road cut sections based on corrugated steel plates according to claim 1, characterized in that: The two adjacent corrugated steel plates are bolted together, and polyethylene foam boards are pasted at the joint.

3. The landslide control structure for road cut sections based on corrugated steel plates according to claim 1, characterized in that: The positioning lever is a rod with a smooth middle and external threads at both ends.

4. A method for landslide control in road cut sections based on corrugated steel plates, characterized in that, Includes the following steps: S1. Construction preparation: Conduct an investigation of the landslide body to determine the sliding surface range and treatment area; clear the slope toe to eliminate unstable surface soil and level the construction site. The width of the hoisting side site must meet the requirements for the overall transportation and hoisting of the corrugated steel plates. S2. Foundation construction: Excavate the foundation pit according to the design drawings, adopt foundation reinforcement measures such as replacement for weak foundations, and pour reinforced concrete foundations. S3. Install corrugated steel plates: Transport the processed corrugated steel components to the site and assemble them ring by ring from one side according to the design drawings; S4. Pouring lining concrete: Tie steel mesh to the outside of the installed corrugated steel plate and pour a layer of reinforced concrete lining. S5. Symmetrical backfilling on both sides: After the lining concrete reaches the design strength, concrete is used for backfilling. After the backfill concrete reaches the design strength, the gap between it and the landslide body behind it is filled with graded sand and gravel and soil and rock in layers, symmetrically backfilled and compacted to form a compacted backfill body, providing lateral restraint. S6. Drainage system setup and surface restoration: A culvert and drainage hole are set at the bottom of the backfilled concrete body to introduce groundwater in the landslide body into the culvert through a gravel filter layer for unified discharge; the entrance and exit are made of soil slope, and a concrete retaining wall and drainage hole are set at the toe of the slope. The slope is restored using concrete frame slope protection measures.

5. A method for landslide control in road cut sections based on corrugated steel plates according to claim 4, characterized in that: S2 specifically refers to: S21. Excavation of the foundation pit is carried out using manual labor in conjunction with excavators and hydraulic breakers; S22. Pour reinforced concrete foundation. Concrete piles are drilled using down-the-hole drilling. After drilling, the holes are cleaned with an air compressor and the reinforcing cage is lowered and concrete is poured in a timely manner. S23. After the foundation construction is completed, use positioning molds to drill chemical bolt holes on the top surface of the foundation according to the design position. Strictly control the drilling position to ensure accurate positioning of the corrugated steel plate later.

6. A method for landslide control in road cut sections based on corrugated steel plates according to claim 4, characterized in that: S3 specifically refers to: S31. Assemble the corrugated steel plates from one side according to the design drawings to form an arched tunnel. After each ring is assembled, the cross-sectional shape must be measured. If it meets the standard, continue assembling. If it does not meet the standard, adjustments must be made. S32. When assembling the circumferential assembly into the ring, measure the cross-sectional shape and use positioning levers to fix it; S33. Based on the size of the corrugated steel sheet and the conditions for hoisting, transportation and assembly, each three rings constitute an assembly and hoisting unit. After the corrugated steel pipe assembly unit is completed, a positioning lever is installed inside. It is then transported by a flatbed truck to the rear of the crane for hoisting. After each unit is hoisted, the lower edge dimension needs to be measured. If deformation occurs, the dimension is adjusted using the positioning lever to ensure the unit dimension. S34. Use a crane to hoist the unit as a whole to the predetermined position, and use chemical bolts to firmly anchor the angle steel to the bottom concrete foundation. Hoist the next unit to the rear end of the previous unit in sequence. Each hoisted unit is assembled by flange docking to form a complete arched tunnel structure. After hoisting, prevent any deviation, and the measurement team will check and verify.

7. A method for landslide control in road cut sections based on corrugated steel plates according to claim 4, characterized in that, S4 specifically involves: binding a double-layer steel mesh of Φ20@200mm to the outside of the corrugated steel plate, then installing hook bars between the two layers of steel bars, and then setting up the formwork. The formwork is made of wood and reinforced with shear nails reserved on the outside of the corrugated steel plate. Vibration holes are reserved during pouring to ensure that the concrete is dense.

8. A method for landslide control in road cut sections based on corrugated steel plates according to claim 4, characterized in that, S5 specifically refers to: after the lining concrete reaches the design strength, C25 concrete will be used for backfilling within a 4m wide and 2m high range above the tunnel foundation. Drainage culverts will be set up in the backfill concrete in conjunction with the roadbed drainage, and the slope ratio of the backfill side will be controlled at 1:0.

5. After the concrete has been poured for 5-7 days and has reached more than 70% of its design strength, backfilling with graded sand and gravel can begin. Within a 2m high gap between the landslide body and the rear landslide body, graded sand and gravel were used for layered, symmetrical backfilling and compaction. Before backfilling the earthwork, complete the construction of waterproof membrane and cement blanket according to the design requirements; Areas above 2m in height and the arch top are all backfilled with soil and rock to form a compacted backfill body; Small machinery was used to compact the soil within 1.0m of the structure, and the thickness of the layered filling was appropriately reduced to reduce the lateral pressure of the backfill structure on the tunnel structure. The backfilling process continues until the gaps on both sides of the landslide are completely filled, creating effective counterpressure on the landslide.

9. A method for landslide control in road cutting sections based on corrugated steel plates according to claim 4, characterized in that, S6 specifically refers to: laying a drainage pipe with a diameter of D=50 at the bottom of the foundation and at the junction of the backfill and the landslide body, so that the groundwater in the landslide body can be introduced into the drainage culvert through the gravel filter layer and the drainage pipe for unified discharge. The entrance and exit use earthen slopes, with concrete retaining walls and drainage holes at the toe of the slope. The slope gradient is controlled at 1:1.5, and the slope is restored using concrete frame slope protection measures.

10. A method for landslide control in road cut sections based on corrugated steel plates according to claim 6, characterized in that, The installation method for the positioning lever is as follows: First, after assembling each three-ring plate into a unit at the assembly site, multiple positioning levers are symmetrically installed inside the underside of the corrugated steel plate using the holes of shear nails. These levers are then fixed to the troughs of the corrugated plate with nuts to form temporary rigid supports and prevent deformation during transportation and hoisting. After the unit is hoisted to the installation position, the surveyors measure its lower edge dimensions, elevation, and cross-sectional shape, and compare them with the design values. If a dimensional deviation is found, it is corrected by rotating the adjusting bolt of the lever at a specific position; if the chord length is found to be too small and needs to be increased, the bolt is rotated to make the seamless steel pipe push the assembled unit steel corrugated plate, thus increasing the chord length; if the chord length is too large, the bolt is rotated in the opposite direction to make the seamless steel pipe pull the assembled unit steel corrugated plate, thus decreasing the chord length; the adjustment process strictly follows the principle of "micro-scale multiple adjustments, synchronous symmetry", and is dynamically adjusted based on the measurement data; Once the dimensions meet the requirements, immediately tighten the bolts and complete the foundation anchoring and inter-unit flange connection. Finally, remove the positioning levers for reuse.

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