Slope drainage protection structure in collapsible loess area

Abstract

The utility model discloses a collapsible loess area slope surface drainage protection structure, including the drainage open ditch who lays along the length direction of slope foot, a plurality of slope surface drainage ditch who lays along the height direction of slope surface and set between two adjacent slope surface drainage ditch's layered protection structure, and new loess layer protection unit includes the anchoring frame group who lays on new loess layer and the geotextile that covers on anchoring frame group, and anchoring frame group is assembled by a plurality of for accommodating soil solidifying agent's anchoring frame, and anchoring frame includes frame, the first mesh of surrounding cloth in frame periphery and the hollow grouting anchor rod of setting on frame. The utility model adopts different protection measures to different layers, forms three -dimensional protection result, and the new loess layer is protected in block through anchoring frame group, adopts hollow grouting anchor rod and tightly links as a whole with old loess layer to new loess layer, fills soil solidifying agent in anchoring frame, and overall adaptation collapsible loess area protection demand and loess area gale environment.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, and more specifically, to a slope drainage and protection structure in collapsible loess areas. Background Technology

[0002] In collapsible loess areas, slopes are highly susceptible to a series of engineering geological problems under the influence of external forces such as rainfall and runoff. Due to the collapsibility of loess, water infiltration can lead to rapid damage to the soil structure, causing a sharp drop in strength, which in turn can induce slope erosion, collapsing settlement, shallow landslides, and even deep instability, seriously threatening the long-term safety and stability of slope engineering projects such as roads and dam shoulders.

[0003] The strata on slopes in such areas typically exhibit distinct stratification characteristics, mainly including, from top to bottom: (1) New loess layer, with a loose structure and well-developed large pores, exhibiting strong collapsibility and self-weight collapsibility, which is the key and difficult point for engineering protection; (2) Old loess layer, with a relatively dense structure, significantly reduced or no collapsibility, but prone to cracking due to repeated wetting and drying; (3) Fine gravel layer, with high permeability but uneven bearing capacity, easily forming internal erosion channels due to water scouring; (4) Bedrock weathering layer, with large strength differences, and the contact zone with the overlying soil layer is prone to interface slippage due to collapsibility deformation. This typical strata structure is widely present in engineering slopes in the core areas of the Loess Plateau in my country, such as Guanzhong in Shaanxi, Longdong in Gansu, and Taiyuan in Shanxi, and is generally representative.

[0004] Currently, conventional protection methods in this field fail to address the different engineering characteristics of various soil layers, resulting in insufficient consolidation of highly collapsible new loess layers and poor drainage in highly permeable fine gravel layers, leading to inefficient protection. Secondly, there is a lack of systematic interlayer collaborative design, with each soil layer's protection measures operating independently, failing to form an effective overall drainage system. This makes it impossible to cut off the chain reaction of water infiltration inducing collapse, and the methods also have poor adaptability to construction in adverse weather conditions.

[0005] Therefore, there is an urgent need in this field for a new protection scheme that can be precisely adapted to the geological structure and achieve synergistic protection. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a slope drainage and protection structure for collapsible loess areas, addressing the shortcomings of the existing technology. The structure is simple and reasonably designed, employing different protection measures for different layers to form a three-dimensional protection result. The new loess layer is protected in sections by anchoring frame groups, and hollow grouting anchors are used to tightly connect the new loess layer with the old loess layer, providing stable support for the anchoring frame. The anchoring frame is filled with soil solidifying agent, so that a tightly structured solidified layer is formed on the surface of the new loess layer, achieving effective solidification of the highly collapsible new loess layer. It is fully adaptable to the protection needs of collapsible loess areas and the windy environment of loess areas.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a slope drainage and protection structure for collapsible loess areas. The slope of the collapsible loess area includes, from top to bottom, a new loess layer, an old loess layer, a fine gravel layer, and a bedrock weathering layer. The structure is characterized by: drainage ditches laid along the length of the slope toe, multiple slope drainage ditches laid along the height of the slope, and a layered protection structure set between two adjacent slope drainage ditches. The layered protection structure includes a new loess layer protection unit set on the new loess layer, an old loess layer protection unit set on the old loess layer, a fine gravel layer protection unit set on the fine gravel soil layer, and a bedrock weathering layer protection unit set on the bedrock weathering layer. The new loess layer protection unit includes an anchor frame assembly laid on the new loess layer and a geotextile covering the anchor frame assembly; the anchor frame assembly is composed of multiple anchor frames for containing soil stabilizer, and the anchor frame includes a frame, a first mesh surrounding the frame, and a hollow grouting anchor rod fitted on the frame.

[0008] The above-mentioned slope drainage and protection structure for collapsible loess areas is characterized by: including a connector, which has a through hole for hollow grouting anchor rods to pass through, and multiple branch joints arranged around the connector. Multiple horizontal connecting rods for connecting the branch joints are fixedly connected inside the frame.

[0009] The above-mentioned slope drainage and protection structure in collapsible loess areas is characterized in that: the fine gravel soil layer protection unit includes a drainage blind ditch buried at the bottom of the fine gravel soil layer, the two ends of the drainage blind ditch are respectively connected to the inlet pipe of the water collection well, a one-way valve is installed on the inlet pipe, the outlet pipe of the water collection well is connected to the slope drainage ditch, and gabion cages are laid on the top and sides of the drainage blind ditch.

[0010] The above-mentioned slope drainage and protection structure for collapsible loess areas is characterized in that: the old loess layer protection unit includes a three-dimensional vegetation net laid on the old loess layer, and the three-dimensional vegetation net is covered with soil for planting green plants.

[0011] The above-mentioned slope drainage and protection structure for collapsible loess areas is characterized in that: the bedrock weathering layer protection unit includes a second mesh laid along the bedrock weathering layer and a concrete surface layer, the concrete surface layer is drilled with drainage holes extending into the bedrock weathering layer, and permeable pipes are installed in the drainage holes.

[0012] The above-mentioned slope drainage and protection structure for collapsible loess areas is characterized in that: the joint includes two transverse joints respectively disposed on both sides of the outer wall of the connector, and the horizontal connecting rod includes at least two horizontal connecting rods, one end of the horizontal connecting rod is fixedly connected to the frame, and the other end of the horizontal connecting rod is connected to the transverse joint.

[0013] The above-mentioned slope drainage and protection structure for collapsible loess areas is characterized in that: the joint includes two longitudinal joints respectively disposed on both sides of the outer wall of the connector, and the horizontal connecting rod includes at least two horizontal longitudinal connecting rods, one end of the horizontal longitudinal connecting rod is fixedly connected to the frame, and the other end of the horizontal longitudinal connecting rod is connected to the longitudinal joint.

[0014] The above-mentioned slope drainage and protection structure in collapsible loess areas is characterized in that: the soil stabilizer includes fly ash, slag powder and stabilizer.

[0015] The above-mentioned slope drainage and protection structure in collapsible loess areas is characterized in that: the slope drainage ditch is composed of a cement blanket laid in the ditch.

[0016] The above-mentioned slope drainage and protection structure in collapsible loess areas is characterized in that: the drainage blind ditch includes a permeable pipe and a non-woven permeable cloth wrapped around the permeable pipe.

[0017] This utility model has the following advantages compared with the prior art: 1. This utility model has a simple structure, reasonable design, and is convenient to implement and use.

[0018] 2. This utility model divides the slope of collapsible loess areas into new loess layer, old loess layer, fine gravel layer and bedrock weathering layer, and adopts different protection measures for different layers to form a three-dimensional protection result with complementary functions, transforming local reinforcement into lasting stability of the slope of collapsible loess areas.

[0019] 3. This utility model uses anchor frame groups to protect the new loess layer in sections, limiting the range of collapsibility deformation of the new loess. At the same time, hollow grouting anchor rods are used to tightly connect the new loess layer with the old loess layer. With the help of the strong bearing capacity and stability of the old loess layer itself, it provides stable support for the anchor frame, thereby achieving effective solidification of the highly collapsible new loess layer.

[0020] 4. This utility model fills the anchor frame with soil stabilizer to prevent the soil stabilizer from drifting across regions in strong winds. The soil stabilizer fully contacts the new loess layer to carry out a solidification reaction, filling the gaps in the soil and forming a tightly structured solidified layer on the surface of the new loess layer, thus inhibiting the new loess layer from sinking due to water absorption.

[0021] 5. In this utility model, the hollow grouting anchor rod and the frame are quickly and stably connected through the connector, which improves construction efficiency, reduces the construction cycle, and fully adapts to the protection needs of collapsible loess areas and the windy environment of loess areas.

[0022] In summary, this utility model employs different protective measures for different layers to form a three-dimensional protective effect. The new loess layer is protected in sections by anchoring frame groups, and hollow grouting anchors are used to tightly connect the new loess layer with the old loess layer, providing stable support for the anchoring frame. The anchoring frame is filled with soil solidifying agent, so that a tightly structured solidified layer is formed on the surface of the new loess layer, achieving effective solidification of the highly collapsible new loess layer. It is fully adaptable to the protection needs of collapsible loess areas and the windy environment of loess areas.

[0023] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a structural schematic diagram of the anchoring frame of this utility model.

[0026] Figure 3 This is a schematic diagram showing the connection relationship between the hollow grouting anchor rod and the connector of this utility model.

[0027] Figure 4 This is a schematic diagram of the framework of this utility model.

[0028] Figure 5 This is a schematic diagram of the structure of the cement blanket of this utility model.

[0029] Figure 6 This is a schematic diagram of the structure of the water collection well of this utility model.

[0030] In the diagram: 1. New loess layer; 11. Anchor frame; 111. Frame; 112. Horizontal transverse connecting rod; 113. Horizontal longitudinal connecting rod; 114. Hollow grouting anchor; 1142. Connector; 1144. Drill bit; 12. Geotextile; 13. ; 2. Old loess layer; 21. Three-dimensional vegetation net; 3. Fine gravelly soil layer; 31. Drainage blind ditch; 32. Outlet pipe; 33. One-way valve; 34. Inlet pipe; 35. Collection well; 4. Bedrock weathered layer; 41. Concrete surface layer; 42. Permeable pipe; 5. Slope drainage ditch; 51. Cement blanket; 6. Open drainage ditch. Detailed Implementation

[0031] The present application will now be described in further detail with reference to the accompanying drawings and embodiments thereof.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] like Figures 1 to 6 As shown, this application discloses a slope drainage and protection structure for collapsible loess areas. The slope of the collapsible loess area includes a new loess layer 1, an old loess layer 2, a fine gravel layer 3, and a bedrock weathering layer 4 stacked from top to bottom. The drainage and protection structure includes a drainage ditch 6 laid along the length of the slope toe, multiple slope drainage ditches 5 laid along the height of the slope, and a layered protection structure set between two adjacent slope drainage ditches 5.

[0037] It should be noted that the water in the slope drainage ditch 5 flows into the open drainage ditch 6, which can quickly drain the water on the slope, prevent rainwater from infiltrating and inducing the collapse of collapsible loess, and at the same time reduce the erosion of the slope by the accumulated water, which can reduce the risk of soil collapse in collapsible loess areas due to collapse and erosion.

[0038] This application proposes a layered protection system for collapsible loess areas. In the protection of collapsible loess areas, it can accurately reinforce the new loess layer 1 and the old loess layer 2, inhibit the collapsing deformation of the highly collapsible new loess layer 1, enhance the overall stability of the weakly collapsible old loess layer 2, improve the overall slope stability, and adapt to the complex environment of loess areas.

[0039] The layered protection structure includes a new loess layer protection unit set on the new loess layer 1, an old loess layer protection unit set on the old loess layer 2, a fine gravel layer protection unit set on the fine gravel layer 3, and a bedrock weathering layer protection unit set on the bedrock weathering layer 4.

[0040] The new loess layer protection unit includes an anchor frame assembly laid on the new loess layer 1, and a geotextile 12 covering the anchor frame assembly; the anchor frame assembly is assembled from multiple anchor frames 11 for containing soil stabilizer, and the anchor frame 11 includes a frame 111, a first mesh surrounding the frame 111, and a hollow grouting anchor rod 114 sleeved on the frame 111.

[0041] The anchor frame group and geotextile 12 laid on the new loess layer 1 work together to prevent the soil stabilizer from being severely dispersed by strong winds, resulting in insufficient effective adhesion to the slope, while ensuring the uniformity of the soil stabilizer and avoiding leaving weak areas.

[0042] Since the anchor frame 11 has no bottom plate, the soil stabilizer can fully contact the new loess layer 1, undergo a solidification reaction, fill the gaps in the soil, and form a tightly structured solidified layer on the surface of the new loess layer 1, thus inhibiting the collapse of the new loess layer 1 due to water absorption. The first mesh surrounding the frame 111 is used to limit the range of the soil stabilizer, prevent its loss, and ensure the solidification reaction of the soil stabilizer.

[0043] The anchoring frame assembly is composed of multiple anchoring frames 11 for containing soil stabilizer. The anchoring frame assembly provides segmented protection for the new loess layer 1, dividing the highly collapsible new loess layer 1 into multiple reinforced blocks. On the one hand, it allows the soil stabilizer to be precisely filled into each reinforced block, preventing the soil stabilizer from drifting across areas in strong winds and ensuring that the new loess in each reinforced block can fully contact the soil stabilizer. On the other hand, by dividing the new loess layer 1 into blocks, the anchoring frame assembly can limit the collapsible deformation range of the new loess. Even if the local soil shrinks slightly due to water, it will not spread to the entire slope, thereby achieving effective solidification of the highly collapsible new loess layer 1.

[0044] The hollow grouting anchor 114 can directly fix the anchor frame group on the new loess layer 1, and can penetrate more than 1 meter into the old loess layer 2. Through its hollow structure, it can grout and reinforce the soil of the old loess layer 2. While enhancing the connection strength between the anchor frame 11 and the new loess layer 1, it can also strengthen the connection between the old loess layer 2 and the new loess layer 1, thus tightly connecting the new loess layer 1 and the old loess layer 2 into one. With the strong bearing capacity and stability of the old loess layer 2 itself, it provides stable support for the anchor frame 11, effectively fixing the new loess layer 1 and preventing it from collapsing or sliding, further ensuring the overall stability of the slope protection in collapsible loess areas.

[0045] The hollow grouting anchor 114, which is fitted onto the frame 111, makes the installation of the hollow grouting anchor 114 simple. It can quickly form a stable connection with the frame 111 without the need for additional complex positioning structures, thereby improving construction efficiency, reducing the construction cycle, and fully adapting to the protection needs of collapsible loess areas and the windy environment of loess areas.

[0046] In this embodiment, a connector 1142 is included. The connector 1142 has a through hole through which the hollow grouting anchor rod 114 can pass. Multiple sub-joints are arranged around the connector 1142. Multiple horizontal connecting rods for connecting the sub-joints are fixedly connected to the inner side of the frame 111.

[0047] It should be noted that the horizontal connecting rod is welded to the frame 111 or integrally formed, and the connecting part 1142 is welded to the horizontal connecting rod.

[0048] During the protective construction, the anchor frame 11 is laid on the new loess layer 1, and then the hollow grouting anchor rod 114 is inserted into the through hole of the connector 1142. Then, the tail of the hollow grouting anchor rod 114 is connected to the hydraulic drilling rig through the coupling. The hydraulic drilling rig is started, and the rotational torque and axial thrust output by the hydraulic drilling rig drive the drill bit 1144 of the hollow grouting anchor rod 114 to drill into the new loess layer 1. The drill bit of the hollow grouting anchor rod 114 is anchored to a depth of 1 meter or more in the old loess layer 2, and the drilling is stopped. Subsequently, grouting is performed through the hollow channel of the hollow grouting anchor rod 114 to complete the anchoring.

[0049] In this embodiment, the fine gravel soil layer protection unit includes a drainage blind ditch 31 buried at the bottom of the fine gravel soil layer 3. The two ends of the drainage blind ditch 31 are respectively connected to the water inlet pipe 34 of the water collection well 35. A one-way valve 33 is installed on the water inlet pipe 34. The water outlet pipe 32 of the water collection well 35 is connected to the slope drainage ditch 5. Gabion cages are laid on the top and sides of the drainage blind ditch 31.

[0050] The drainage ditch 31 collects groundwater and infiltrated rainwater from the fine gravelly soil layer 3, and then directs it to the collection well 35 through the inlet pipe 34, reducing downward water infiltration and preventing settlement and deformation of the collapsible loess due to increased water content. The one-way valve 33 allows groundwater from the drainage ditch 31 to flow unidirectionally into the collection well 35, preventing backflow of water from the collection well 35 or the slope drainage ditch 5 back into the drainage ditch 31, ensuring a smooth unidirectional drainage path. Groundwater in the collection well 35 is directed to the slope drainage ditch 5 through the outlet pipe 32, solving the problem of diverting water from a low-lying water source to a higher-lying area.

[0051] Gabion mesh cages are laid on the top and sides of the drainage blind ditch 31. The mesh cages allow groundwater to seep into the blind ditch 31 normally without affecting the drainage effect. At the same time, the drainage blind ditch 31 is prevented from being squeezed, deformed or blocked by the soil, thus maintaining the stability of the soil around the drainage blind ditch 31.

[0052] In this embodiment, the old loess layer protection unit includes a three-dimensional vegetation net 21 laid on the old loess layer 2, and the three-dimensional vegetation net 21 is covered with soil for planting green plants.

[0053] In practical applications, the three-dimensional vegetation net uses honeycomb geogrids. The three-dimensional structure of the vegetation net can improve the adhesion of the topsoil, effectively preventing soil loss and slope erosion during rainfall in collapsible loess areas, and creating conditions for plant growth. After the plant roots take root, they solidify the surface soil of the old loess layer 2, inhibiting the shrinkage, settlement and deformation of collapsible loess caused by changes in water content.

[0054] In this embodiment, the bedrock weathering layer protection unit includes a second mesh sheet laid along the bedrock weathering layer 4 and a concrete surface layer. The concrete surface layer 41 is drilled with drainage holes that extend into the bedrock weathering layer 4, and a permeable pipe 42 is installed in the drainage holes.

[0055] In practical use, the bedrock weathered layer 4 is protected by a mesh-covered shotcrete system. A second mesh is laid along the surface of the bedrock weathered layer 4 and a concrete surface layer 41 is sprayed on top. This not only restrains the loose particles of the bedrock weathered layer 4 but also blocks rainwater from flowing directly down, reducing the risk of loess subsidence from the slope end. At the same time, drainage holes are drilled into the concrete surface layer and inserted into the bedrock weathered layer. Permeable pipes 42 are inserted into the drainage holes to quickly drain the groundwater and infiltrated rainwater trapped in the bedrock weathered layer 4, preventing water infiltration and reducing the risk of loess subsidence.

[0056] This application divides the slope of collapsible loess area into new loess layer 1, old loess layer 2, fine gravel layer 3 and bedrock weathering layer 4, and adopts different protection measures for different layers to form a three-dimensional protection result with complementary functions, transforming local reinforcement into lasting stability of the slope of collapsible loess area.

[0057] In this embodiment, the tap joint includes two transverse tap joints respectively disposed on both sides of the outer wall of the connector 1142, and the horizontal connecting rod includes at least two horizontal connecting rods 112. One end of the horizontal connecting rod 112 is fixedly connected to the frame 111, and the other end of the horizontal connecting rod 112 is connected to the transverse tap joint.

[0058] In this embodiment, the tap joint includes two longitudinal tap joints respectively disposed on both sides of the outer wall of the connector 1142, and the horizontal connecting rod includes at least two horizontal longitudinal connecting rods 113. One end of the horizontal longitudinal connecting rod 113 is fixedly connected to the frame 111, and the other end of the horizontal longitudinal connecting rod 113 is connected to the longitudinal tap joint.

[0059] In practical use, in one possible embodiment, the tap consists of only two lateral taps.

[0060] In one possible embodiment, the tap consists of only two longitudinal taps.

[0061] In one possible embodiment, the joint includes two transverse joints and two longitudinal joints. The two transverse joints and two longitudinal joints form a cross-shaped system, which evenly distributes the load to the entire frame in both the transverse and longitudinal directions, avoiding local stress concentration and deformation of the anchor frame.

[0062] In this embodiment, the soil stabilizer includes fly ash, slag powder, and a stabilizer.

[0063] In actual use, mix according to the following mass ratio: 45% fly ash, 45% slag powder, and 10% curing agent. The curing agent used is a dry-spreading curing agent specifically for loess.

[0064] Fly ash and slag powder, as industrial waste admixtures, fill the pores of loess and participate in the hydration reaction, which can reduce the amount of solidifying agent required. The solidifying agent forms a dense solidified layer on the surface of the new loess layer 1, specifically improving the collapsibility of the loess.

[0065] In this embodiment, the slope drainage ditch 5 is composed of a cement blanket 51 laid in the ditch.

[0066] In actual use, first dig a trench, level and compact the trench foundation, remove debris to ensure a smooth slope, then lay the cement blanket with the rough side down along the trench, and anchor the slope with U-shaped nails. Next, use a sprinkler to water in a fine mist. After watering, the cement begins to hydrate and harden naturally, and the slope drainage ditch 5 is complete.

[0067] Cement blanket 51, as a precast component of slope drainage ditch 5, eliminates traditional processes such as formwork, on-site mixing, pouring, and long-term wet curing. It accelerates the construction progress, reduces on-site operation time and water consumption, and avoids the adverse effects of strong winds, dust, and low temperatures on concrete solidification, making it suitable for the protection needs of collapsible loess areas and the windy environment of loess areas.

[0068] In this embodiment, the drainage blind ditch 31 includes a permeable pipe and a non-woven permeable fabric wrapped around the permeable pipe.

[0069] The above description is merely an embodiment of this application and does not constitute any limitation on this application. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of this application shall still fall within the protection scope of the technical solution of this application.

Claims

1. A slope drainage and protection structure for collapsible loess areas, wherein the slope of the collapsible loess area comprises, from top to bottom, a new loess layer (1), an old loess layer (2), a fine gravel layer (3), and a bedrock weathering layer (4), characterized in that: It includes open drainage ditches (6) laid along the length of the slope toe, multiple slope drainage ditches (5) laid along the height of the slope, and a layered protective structure set between two adjacent slope drainage ditches (5). The layered protection structure includes a new loess layer protection unit set on the new loess layer (1), an old loess layer protection unit set on the old loess layer (2), a fine gravel layer protection unit set on the fine gravel layer (3), and a bedrock weathering layer protection unit set on the bedrock weathering layer (4). The new loess layer protection unit includes an anchor frame group laid on the new loess layer (1) and a geotextile (12) covering the anchor frame group; the anchor frame group is assembled from multiple anchor frames (11) for containing soil stabilizer, and the anchor frame (11) includes a frame (111), a first mesh surrounding the frame (111) and a hollow grouting anchor rod (114) sleeved on the frame (111).

2. A slope drainage and protection structure for collapsible loess areas according to claim 1, characterized in that: Includes a connector (1142), which has a through hole through which a hollow grouting anchor rod (114) can pass. Multiple sub-joints are arranged around the connector (1142), and multiple horizontal connecting rods for connecting the sub-joints are fixedly connected inside the frame (111).

3. A slope drainage and protection structure for collapsible loess areas according to claim 1, characterized in that: The fine gravel soil layer protection unit includes a drainage blind ditch (31) buried at the bottom of the fine gravel soil layer (3). The two ends of the drainage blind ditch (31) are connected to the inlet pipe (34) of the water collection well (35). A one-way valve (33) is installed on the inlet pipe (34). The outlet pipe (32) of the water collection well (35) is connected to the slope drainage ditch (5). Gabion cages are laid on the top and sides of the drainage blind ditch (31).

4. A slope drainage and protection structure for collapsible loess areas according to claim 1, characterized in that: The old loess layer protection unit includes a three-dimensional vegetation net (21) laid on the old loess layer (2), and the three-dimensional vegetation net (21) is covered with soil for planting green plants.

5. A slope drainage and protection structure for collapsible loess areas according to claim 1, characterized in that: The bedrock weathering layer protection unit includes a second mesh laid along the bedrock weathering layer (4) and a concrete surface layer (41). The concrete surface layer (41) is drilled with drainage holes that extend into the bedrock weathering layer (4), and a permeable pipe (42) is installed in the drainage holes.

6. A slope drainage and protection structure for collapsible loess areas according to claim 2, characterized in that: The tap joint includes two transverse tap joints respectively disposed on both sides of the outer wall of the connector (1142), and the horizontal connecting rod includes at least two horizontal transverse connecting rods (112). One end of the horizontal transverse connecting rod (112) is fixedly connected to the frame (111), and the other end of the horizontal transverse connecting rod (112) is connected to the transverse tap joint.

7. A slope drainage and protection structure for collapsible loess areas according to claim 2 or 6, characterized in that: The tap joint includes two longitudinal tap joints respectively disposed on both sides of the outer wall of the connector (1142), and the horizontal connecting rod includes at least two horizontal longitudinal connecting rods (113). One end of the horizontal longitudinal connecting rod (113) is fixedly connected to the frame (111), and the other end of the horizontal longitudinal connecting rod (113) is connected to the longitudinal tap joint.

8. A slope drainage and protection structure for collapsible loess areas according to claim 1, characterized in that: Soil stabilizers include fly ash, slag powder, and stabilizers.

9. A slope drainage and protection structure for collapsible loess areas according to claim 1 or 2, characterized in that: The slope drainage ditch (5) consists of a cement blanket (51) laid in the ditch.

10. A slope drainage and protection structure for collapsible loess areas according to claim 1, characterized in that: The drainage blind ditch (31) includes a permeable pipe and a non-woven permeable fabric wrapped around the permeable pipe.

Images