Polypropylene filament composite geotextile for tunnel drainage

Abstract

The utility model discloses a kind of polypropylene filament composite geotextile for tunnel drainage, including geotextile body, the geotextile body includes nonwoven geotextile, the upper of nonwoven geotextile is provided with composite coating, the lower of nonwoven geotextile is provided with first woven geotextile, the lower of first woven geotextile is provided with second woven geotextile, the lower of second woven geotextile is provided with first reinforcing layer, the lower of first reinforcing layer is provided with second reinforcing layer, the lower of second reinforcing layer is provided with third reinforcing layer, the lower of third reinforcing layer is provided with third woven geotextile. Through the above structure, the wear resistance, the strength and the compression resistance of geotextile itself can be improved, so that the shear dilation deformation of surrounding rock or the water absorption swelling of surrounding rock occurs, and when the friction and extrusion of surrounding rock to geotextile, the geotextile is not easy to be damaged, to avoid the phenomenon of tunnel leakage.

Description

Technical Field

[0001] This utility model relates to the field of geotextile technology, and in particular to a polypropylene filament composite geotextile for tunnel drainage. Background Technology

[0002] Polypropylene filament composite geotextile is a high-performance synthetic material that combines the advantages of nonwoven and woven geotextiles. It is made by forming a nonwoven layer from polypropylene filaments through needle punching or thermal bonding, and then combining it with a woven layer.

[0003] In existing technologies, during tunnel construction, in order to remove groundwater from the surrounding rock, prevent moisture from seeping into the lining, and keep the tunnel dry, geotextiles are often laid between the tunnel lining and the surrounding rock. However, some of the inner walls of the surrounding rock are not very smooth. During the construction process, as some of the surrounding rock undergoes shear expansion and water absorption, the geotextiles experience friction and compression. Some geotextiles have poor wear resistance and low compressive strength, making them prone to damage during this process, which can lead to tunnel leakage. Furthermore, structural limitations make it difficult to repair geotextiles. Utility Model Content

[0004] The purpose of this utility model is to provide a polypropylene filament composite geotextile for tunnel drainage, which can improve the wear resistance, strength and compressive strength of the geotextile itself, so that the geotextile is not easily damaged when the surrounding rock undergoes shear dilatation deformation or water absorption expansion.

[0005] To achieve the above objectives, a polypropylene filament composite geotextile for tunnel drainage is provided, comprising a geotextile body, wherein the geotextile body includes a nonwoven geotextile, a composite coating is disposed on the upper part of the nonwoven geotextile, a first woven geotextile is disposed below the nonwoven geotextile, a second woven geotextile is disposed below the first woven geotextile, a first reinforcing layer is disposed below the second woven geotextile, a second reinforcing layer is disposed below the first reinforcing layer, a third reinforcing layer is disposed below the second reinforcing layer, and a third woven geotextile is disposed below the third reinforcing layer.

[0006] According to the aforementioned polypropylene filament composite geotextile for tunnel drainage, the third reinforcing layer includes a soft covering layer, a support frame is fixedly connected inside the soft covering layer, and soft plates are fixedly connected to the left and right sides of the support frame.

[0007] According to the aforementioned polypropylene filament composite geotextile for tunnel drainage, the nonwoven geotextile is made of polypropylene, the first woven geotextile is made of polypropylene, the second woven geotextile is made of polypropylene, and the third woven geotextile is made of polypropylene.

[0008] According to the aforementioned polypropylene filament composite geotextile for tunnel drainage, the first reinforcing layer is made of high-density polyethylene.

[0009] According to the aforementioned polypropylene filament composite geotextile for tunnel drainage, the second reinforcing layer is made of glass fiber.

[0010] According to the aforementioned polypropylene filament composite geotextile for tunnel drainage, the third reinforcing layer is made of polyester.

[0011] This utility model has the following beneficial effects:

[0012] 1. Compared with the prior art, this polypropylene filament composite geotextile for tunnel drainage utilizes a nonwoven geotextile, a first woven geotextile, and a second woven geotextile stacked together, with a wear-resistant coating applied to the top of the nonwoven geotextile, making the contact surface with the surrounding rock more wear-resistant; by setting a first reinforcing layer, a second reinforcing layer, and a third reinforcing layer, based on the characteristics of the three layers, the overall geotextile has higher strength and better compressive performance through their combined effect; through the combined effect of the above layers, the geotextile is not easily damaged during the working process.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0015] Figure 1 This is a perspective view of a polypropylene filament composite geotextile for tunnel drainage according to this utility model.

[0016] Figure 2 This is a cross-sectional view of a polypropylene filament composite geotextile for tunnel drainage according to this utility model.

[0017] Figure 3 This utility model relates to a polypropylene filament composite geotextile for tunnel drainage. Figure 2 Enlarged view of point A in the middle.

[0018] Legend:

[0019] 1. Geotextile body; 2. Nonwoven geotextile; 3. Composite coating; 4. First woven geotextile; 5. Second woven geotextile; 6. First reinforcing layer; 7. Second reinforcing layer; 8. Third reinforcing layer; 9. Third woven geotextile;

[0020] 81. Soft covering layer; 82. Support frame; 83. Flexible board. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-3 This utility model discloses a polypropylene filament composite geotextile for tunnel drainage, comprising a geotextile body 1, a nonwoven geotextile 2, a composite coating 3 on the upper part of the nonwoven geotextile 2, a first woven geotextile 4 below the nonwoven geotextile 2, a second woven geotextile 5 below the first woven geotextile 4, a first reinforcing layer 6 below the second woven geotextile 5, the first reinforcing layer 6 being made of high-density polyethylene, and a second reinforcing layer 7 below the first reinforcing layer 6. The material is glass fiber. Below the second reinforcing layer 7, there is a third reinforcing layer 8. The material of the third reinforcing layer 8 is polyester. The third reinforcing layer 8 includes a soft covering layer 81. A support frame 82 is fixedly connected inside the soft covering layer 81. Soft plates 83 are fixedly connected to the left and right sides of the support frame 82. Below the third reinforcing layer 8, there is a third woven geotextile 9. The material of the nonwoven geotextile 2 is polypropylene, the material of the first woven geotextile 4 is polypropylene, the material of the second woven geotextile 5 is polypropylene, and the material of the third woven geotextile 9 is polypropylene.

[0023] The above structure includes a nonwoven geotextile 2, a first woven geotextile 4 below the nonwoven geotextile 2, and the nonwoven geotextile 2 and the first woven geotextile 4 are fixed together by needle punching. A second woven geotextile 5 is provided below the first woven geotextile 4, and the contact surfaces of the first woven geotextile 4 and the second woven geotextile 5 are connected by hot pressing.

[0024] By incorporating nonwoven geotextile 2, the structural characteristics of nonwoven geotextile 2 enable it to provide good permeability and filtration performance, allowing water to pass through while preventing soil particle loss.

[0025] By providing a composite coating 3, which includes a butylated hydroxytoluene coating, the nonwoven geotextile 2 is prevented from degrading due to oxidation during long-term use, thus extending its service life. The composite coating 3 also includes polytetrafluoroethylene (PTFE), which increases the abrasion resistance of the nonwoven geotextile 2 and prevents damage caused by friction.

[0026] By incorporating a first woven geotextile 4 and a second woven geotextile 5, the composite geotextile possesses the following characteristics: Tensile strength: The woven layers, composed of interwoven warp and weft fibers, exhibit high tensile strength. This allows the composite geotextile to withstand significant tensile and stress forces, making it suitable for projects requiring high load-bearing capacity. Tear strength: The structure of the woven layers provides excellent tear resistance, preventing damage under external forces. Deformation resistance: The dense structure of the woven layers minimizes deformation. This ensures the composite geotextile maintains stable dimensions under external factors such as temperature changes and mechanical stress, guaranteeing the long-term stability and reliability of the project.

[0027] The first reinforcing layer 6 is made of high-density polyethylene (HDPE), which possesses the following characteristics: high strength and toughness; tensile strength: HDPE has high tensile strength and can withstand significant mechanical stress; impact strength: Even at low temperatures, HDPE exhibits good impact resistance and is not easily broken; acid and alkali resistance: HDPE has good corrosion resistance to most acids, alkalis, and organic solvents, making it suitable for various chemical environments; aging resistance: HDPE has good weather resistance and can be used outdoors for extended periods without aging; water resistance: HDPE has very low water absorption, almost non-absorbent, thus exhibiting excellent waterproof performance; moisture resistance: In humid environments, HDPE's mechanical properties are not affected by water absorption; temperature range: HDPE can be used over a wide temperature range, typically maintaining good performance between -40°C and 80°C. Therefore, HDPE is chosen as the material for the first reinforcing layer 6.

[0028] By incorporating a second reinforcing layer 7, made of glass fiber, the overall strength and rigidity of the composite material can be significantly improved due to the extremely high tensile strength and elastic modulus of glass fiber. High-temperature resistance: Glass fiber exhibits excellent high-temperature resistance, maintaining its mechanical properties even at high temperatures. Corrosion resistance: Glass fiber demonstrates good resistance to most acids, alkalis, and organic solvents, and is not easily corroded by chemical substances. Dimensional stability: Glass fiber has a low coefficient of thermal expansion, maintaining stable dimensions under temperature changes. Lightweight and high-strength: Glass fiber has a low density but high strength, enabling lightweight designs. Therefore, glass fiber is chosen as the material for the second reinforcing layer 7.

[0029] The third reinforcing layer 8 is provided, and the material of the third reinforcing layer 8 is polyester. Polyester has advantages such as high strength, durability, good dimensional stability, chemical corrosion resistance, weather resistance, low water absorption, good processing performance, lightweight, environmentally friendly and recyclable, electrical insulation performance, good dyeing performance and cost-effectiveness, making it the material of the third reinforcing layer 8.

[0030] Working principle: During the tunnel excavation process, the geotextile body 1 is installed on the outside of the lining, and the third woven geotextile 9 is brought into contact with the lining, thus completing the installation of the geotextile body 1.

[0031] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A polypropylene filament composite geotextile for tunnel drainage, characterized in that, The system includes a geotextile body (1), which includes a nonwoven geotextile (2). A composite coating (3) is provided on the top of the nonwoven geotextile (2). A first woven geotextile (4) is provided below the nonwoven geotextile (2). A second woven geotextile (5) is provided below the first woven geotextile (4). A first reinforcing layer (6) is provided below the second woven geotextile (5). A second reinforcing layer (7) is provided below the first reinforcing layer (6). A third reinforcing layer (8) is provided below the second reinforcing layer (7). A third woven geotextile (9) is provided below the third reinforcing layer (8).

2. The polypropylene filament composite geotextile for tunnel drainage according to claim 1, characterized in that, The third reinforcing layer (8) includes a soft covering layer (81), and a support frame (82) is fixedly connected inside the soft covering layer (81). Soft plates (83) are fixedly connected to the left and right sides of the support frame (82).

3. The polypropylene filament composite geotextile for tunnel drainage according to claim 1, characterized in that, The nonwoven geotextile (2) is made of polypropylene, the first woven geotextile (4) is made of polypropylene, the second woven geotextile (5) is made of polypropylene, and the third woven geotextile (9) is made of polypropylene.

4. The polypropylene filament composite geotextile for tunnel drainage according to claim 1, characterized in that, The first reinforcing layer (6) is made of high-density polyethylene.

5. The polypropylene filament composite geotextile for tunnel drainage according to claim 1, characterized in that, The second reinforcing layer (7) is made of glass fiber.

6. The polypropylene filament composite geotextile for tunnel drainage according to claim 1, characterized in that, The third reinforcing layer (8) is made of polyester.

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