A composite geotextile and drainage reinforcement structure

Abstract

The present invention provides a composite geotextile and a drainage reinforcement structure, wherein the composite geotextile comprises an upper fabric layer, a middle fabric layer and a lower fabric layer which are sequentially arranged from top to bottom, wherein the upper fabric layer is a drainage geotextile, which comprises a first warp yarn and a first weft yarn, wherein the first warp yarn and / or the first weft yarn contain wicking fibers, and a plurality of first perforations are formed between the first warp yarn and the first weft yarn; the middle fabric layer is a geofilter, which is provided with a plurality of second perforations; the lower fabric layer is a reinforced geotextile, which is provided with a plurality of third perforations, wherein the apertures of the second perforations are respectively larger than the apertures of the first perforations and the apertures of the third perforations, and the first perforations, the second perforations and the third perforations are mutually conductive. The drainage reinforcement structure comprises the above-mentioned composite geotextile. The present invention has good soil water absorption and drainage capacity and a long service life.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical construction, in particular to a composite geotextile and a drainage reinforcement structure. Background Art

[0002] Geotextile, also known as geotextile, is a member of geosynthetics and is often used in the construction of reinforced soil structures. Reinforced soil structures include reinforced soil seals covering landfills, reinforced embankments on soft soil, reinforced steep slopes, reinforced foundation cushions for chemical storage tanks, reinforced roadbeds with high salt content, and so on.

[0003] Existing composite geotextiles, such as the patent with announcement number CN204136518U, discloses a composite geotextile, including a first staple geotextile layer and a second staple geotextile layer, between which a woven geotextile layer is fixed by needle punching, wherein the first staple geotextile layer and the second staple geotextile layer are non-woven geotextiles, and the woven geotextile layer is a woven geotextile. Although woven geotextiles have the advantages of higher tensile strength, high CBR bursting strength, and low elongation at break, the woven geotextile is arranged between two layers of non-woven geotextiles, and the woven geotextile and the non-woven geotextile are connected by fibers. During the use of the composite geotextile, the woven geotextile is in direct contact with the ground, and the fibers are easily broken, which makes it easy for the woven geotextile and the non-woven geotextile to peel off. Moreover, the existing composite geotextiles can only achieve drainage when the soil is saturated and there is a hydraulic gradient to drive water along the plane. When the soil is saturated with water, the soil strength has dropped to the lowest level, posing a safety hazard. Summary of the invention

[0004] The first object of the present invention is to provide a composite geotextile having good soil water absorption and drainage capabilities and a long service life.

[0005] The second object of the present invention is to provide a drainage reinforcement structure which can both reinforce soft saturated soil and drain water to improve the mechanical properties of soft saturated soil.

[0006] The third object of the present invention is to provide a drainage reinforcement structure that can use natural materials with poor drainage performance as backfill materials.

[0007] A fourth object of the present invention is to provide a drainage reinforcement structure for reinforcing steep slopes and earth walls in areas of heavy rainfall and infiltration.

[0008] A fifth object of the present invention is to provide a drainage reinforcement structure capable of collecting leaked liquid.

[0009] The sixth object of the present invention is to provide a drainage reinforcement structure that breaks the capillary rise of groundwater and prevents salt accumulation in the roadbed.

[0010] In order to achieve the above-mentioned first purpose, the present invention provides a composite geotextile, comprising an upper fabric layer, a middle fabric layer and a lower fabric layer arranged in sequence from top to bottom, the upper fabric layer is a water-absorbing and draining geotextile, the water-absorbing and draining geotextile comprises a first warp yarn and a first weft yarn, the first warp yarn and / or the first weft yarn contain wicking fibers, and a plurality of first perforations are formed between the first warp yarn and the first weft yarn; the middle fabric layer is a geofilter, and the geofilter is provided with a plurality of second perforations; the lower fabric layer is a reinforced geotextile, and a plurality of third perforations are provided on the reinforced geotextile, the aperture of the second perforation is respectively larger than the aperture of the first perforation and the aperture of the third perforation, and the first perforation, the second perforation and the third perforation are connected to each other.

[0011] It can be seen from the above scheme that by arranging wicking fibers on the upper layer of the composite geotextile, the composite geotextile has a higher lateral permeability. Under unsaturated soil and saturated soil conditions, the composite geotextile can absorb moisture in the soil and discharge the moisture laterally, so that the soil moisture content is significantly reduced, so as to increase the shear strength of the soil, which is beneficial to strengthen the soil and improve the stability of the soil structure; by arranging a geofilter in the middle layer of the composite geotextile, the interior of the composite geotextile has good in-plane water flow capacity and a higher porosity, which is beneficial to increase the water discharge rate; By setting the aperture of the second perforation larger than the aperture of the first perforation and the aperture of the third perforation, the first perforation and the third perforation are used to filter soil particles on the upper and lower sides to prevent soil particles from entering the interior of the composite geotextile and affecting the drainage capacity of the composite geotextile; by setting a reinforced geotextile in the lower layer of the composite geotextile for direct contact with the ground, since the reinforced geotextile has the advantages of high tensile strength, high CBR bursting strength and low elongation at break, the composite geotextile will not be easily broken or damaged during long-term use, which is beneficial to improving the service life of the composite geotextile.

[0012] In a further embodiment, the middle fabric layer is woven from solid round core yarns made of a low-compressibility polymer material.

[0013] It can be seen from the above scheme that the use of solid round core yarn to weave the geofilter makes the geofilter have lower compressibility and higher porosity. Under high cover layer stress conditions, the compression deformation of the large pores through the geotextile is very small, which is beneficial to ensure the drainage capacity of the composite geotextile.

[0014] A further solution is that the upper fabric layer, the middle fabric layer and the lower fabric layer are connected by a mechanical connection structure, and the mechanical connection structure includes at least one of the following: suture connection, polymer rivet riveting.

[0015] It can be seen from the above scheme that the upper fabric layer, the middle fabric layer and the lower fabric layer are firmly connected together by providing a mechanical connection structure, which is conducive to mutually fastening the layers and preventing peeling and delamination.

[0016] A further solution is that the lengths of the upper fabric layer, the middle fabric layer and the lower fabric layer are equal; first bending portions are respectively provided on both sides in the width direction of the upper fabric layer, and the first bending portions are connected to the side walls of the middle fabric layer; second bending portions are respectively provided on both sides in the width direction of the lower fabric layer, and the second bending portions are connected to the side walls of the middle fabric layer.

[0017] It can be seen from the above scheme that by setting the first bending part and the second bending part respectively connected to the side walls of the middle fabric layer, it is beneficial to further improve the connection strength between the layers and prevent the layers from peeling off from each other. It is also beneficial to prevent the layers of the composite geotextile from peeling off from the side to the center during storage, transportation or construction of the composite geotextile, which is beneficial to ensure the service life of the composite geotextile.

[0018] In order to achieve the above-mentioned second purpose, the drainage reinforcement structure provided by the present invention includes a ground platform layer, a fence portion and a filling layer, the fence portion is arranged on the bottom mold platform layer, a receiving cavity is formed between the fence portion and the ground platform layer, and the filling layer is arranged in the receiving cavity, and the drainage reinforcement structure also includes a first drainage reinforcement layer and a second drainage reinforcement layer, the first drainage reinforcement layer and the second drainage reinforcement layer are both made of the composite geotextile as described above, the first drainage reinforcement layer is arranged at the bottom of the receiving cavity and is located below the fence portion and the filling layer, and the end of the first drainage reinforcement layer protrudes out of the receiving cavity, the second drainage reinforcement layer is arranged on the side wall of the receiving cavity, and both ends of the second drainage reinforcement layer pass through the fence portion and protrude out of the receiving cavity.

[0019] It can be seen from the above scheme that by arranging a first drainage reinforcement layer at the bottom of the accommodating cavity and the two ends of the first drainage reinforcement layer protrude out of the accommodating cavity, it is beneficial to absorb moisture from the bottom surface of the packing layer and discharge it outside the accommodating cavity, which is beneficial to reduce the moisture content of the packing layer. When the moisture content of the packing layer is reduced, the packing layer gradually consolidates to improve the shear strength and material stiffness of the packing layer; by arranging a second drainage layer on the side wall of the accommodating cavity and the two ends of the second drainage layer protrude out of the accommodating cavity, it is beneficial to absorb moisture from the side wall of the packing layer and discharge it outside the accommodating cavity, which is beneficial to improve the drainage efficiency and shorten the consolidation time of the packing layer.

[0020] In order to achieve the third purpose mentioned above, the drainage reinforcement structure provided by the present invention includes a soft soil base layer, a construction platform layer, a drainage channel and an embankment filling layer, the construction platform layer is located above the soft soil base layer, the embankment filling layer is located on the construction platform layer, the drainage channel passes through the construction platform layer and is inserted into the soft soil base layer, the drainage reinforcement structure also includes a third drainage reinforcement layer, the third drainage reinforcement layer is made of the composite geotextile as described above, the third drainage reinforcement layer is located between the soft soil base layer and the construction platform layer, and the end of the third drainage reinforcement layer protrudes outside the construction platform layer.

[0021] It can be seen from the above scheme that the moisture of the embankment filling layer of the construction platform layer can be discharged to the ground through the drainage channel on the one hand, and can be discharged to both sides of the embankment through the third drainage reinforcement layer on the other hand. Even if the embankment filling layer is a natural material with poor drainage performance, the third drainage reinforcement layer can actively absorb moisture to reduce the moisture content of the embankment filling layer, thereby achieving the embankment reinforcement effect. Traditional embankment filling layers are all coarse sand or gravel. With the drainage reinforcement structure of the present invention, the embankment filling layer is not necessarily coarse sand or gravel, but can also be medium sand with poor drainage performance or dredged spoil and other materials, which is conducive to providing more choices for drainage materials of the embankment filling layer.

[0022] In order to achieve the fourth purpose mentioned above, the drainage reinforcement structure provided by the present invention includes original soil, backfill soil, multiple reinforced fabric layers and multiple earth bags, the original soil is provided with a first plane and a first inclined surface, the backfill soil is arranged on the first plane and is adjacent to the first inclined surface, multiple earth bags are arranged along the height direction of the backfill soil on the side facing away from the first inclined surface, multiple reinforced fabric layers are arranged along the height direction of the backfill soil in the backfill soil and are connected to the earth bags, and the drainage reinforcement structure also includes a fourth drainage reinforcement layer, two fifth drainage reinforcement layers and multiple sixth drainage reinforcement layers. The fourth drainage reinforcement layer, the fifth drainage reinforcement layer and the sixth drainage reinforcement layer are all made of the composite geotextile as described above, the fourth drainage reinforcement layer is arranged on the first inclined surface, the two fifth drainage reinforcement layers are arranged at the bottom and the top of the backfill soil, the sixth drainage reinforcement layer is located between the two fifth drainage reinforcement layers, the sixth drainage reinforcement layer and the reinforced fabric layer are arranged at intervals, the fifth drainage reinforcement layer located at the bottom is connected to and conducted with the fourth drainage reinforcement layer, and the ends of the fifth drainage reinforcement layer and the sixth drainage reinforcement layer protrude out of the backfill soil through earthbags respectively.

[0023] It can be seen from the above scheme that by setting the fourth drainage reinforcement layer on the first inclined surface, it is used to drain the moisture of the backfill soil close to the first inclined surface, prevent water seepage on the slope, improve the strength of the backfill soil, and make the backfill soil tightly and firmly connected to the first inclined surface; by setting two fifth drainage reinforcement layers, the fifth drainage reinforcement layer located at the bottom can cut off the capillary rise of the groundwater level and drain the moisture in time, reduce the moisture content of the bottom backfill soil, and maintain the strength of the bottom backfill soil; the fifth drainage reinforcement layer located at the top can drain the moisture in the shallow layer of the ground, reduce the surface wetting, and reduce the infiltration of rainwater on the ground; by setting multiple sixth drainage reinforcement layers, the moisture that penetrates deep into the backfill soil can be drained layer by layer, the moisture content of the backfill soil can be reduced, and the strength of the backfill soil can be improved. The present invention sets drainage reinforcement layers for various parts of the backfill soil, so that the moisture in various parts of the backfill soil can be discharged in time, which plays a reinforcement role, is conducive to improving the overall strength of the backfill soil, and preventing collapse accidents during rainfall.

[0024] In order to achieve the fifth purpose mentioned above, the drainage reinforcement structure provided by the present invention includes a ground support layer, a foundation cushion layer and a storage tank, the storage tank is arranged on the ground support layer through the foundation cushion layer, the ground support layer is provided with a drainage ditch, and the drainage ditch is located on the outside of the base material cushion layer; the drainage reinforcement structure also includes two seventh drainage reinforcement layers, the seventh drainage reinforcement layer is made of the composite geotextile as described above, the two seventh drainage reinforcement layers are arranged up and down in the base cushion layer and are located below the storage tank, and the end of the seventh drainage reinforcement layer passes through the foundation cushion layer and is connected with the drainage ditch.

[0025] It can be seen from the above scheme that by setting the seventh drainage reinforcement layer under the storage tank, if the storage tank leaks, the leaked liquid will be discharged laterally into the ditch under the dual action of the two seventh drainage reinforcement layers, which is convenient for leakage detection and safe removal and prevents the liquid from seeping into the ground; the seventh drainage reinforcement layer can also provide additional mechanical strength for the foundation cushion layer, so that it forms a larger load distribution area on the ground and reduces the differential settlement of the ground.

[0026] In order to achieve the sixth purpose mentioned above, the drainage reinforcement structure provided by the present invention includes a pavement structure layer, a road base layer and a salt-containing base layer arranged in sequence from top to bottom, and the drainage reinforcement structure also includes an eighth drainage reinforcement layer. The eighth drainage reinforcement layer is made of the composite geotextile as described above, and the eighth drainage reinforcement layer is located between the road base layer and the salt-containing base layer, and the end of the eighth drainage reinforcement layer protrudes outside the road base layer.

[0027] It can be seen from the above scheme that by setting the eighth drainage reinforcement layer between the roadbed and the saline base, on the one hand, it can effectively block the capillary rise of groundwater, prevent the salt in the groundwater from entering and accumulating in the roadbed, and prevent the erosion of embedded parts such as concrete pipes and steel pipes buried in the roadbed, which is beneficial to ensure the strength and life of the roadbed; on the other hand, the eighth drainage reinforcement layer can also provide additional mechanical strength for the roadbed to prevent differential settlement of the roadbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a structural diagram of an embodiment of a composite geotextile of the present invention.

[0029] Figure 2 It is a structural diagram of the first embodiment of the drainage reinforcement structure of the present invention.

[0030] Figure 3 It is a structural diagram of the second embodiment of the drainage reinforcement of the present invention.

[0031] Figure 4 It is a structural diagram of the third embodiment of the drainage reinforcement of the present invention.

[0032] Figure 5 It is a structural diagram of the fourth embodiment of the drainage reinforcement of the present invention.

[0033] Figure 6 It is a structural diagram of the fifth embodiment of the drainage reinforcement of the present invention.

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0035] Geotextile Examples

[0036] See also Figure 1 The composite geotextile of this embodiment includes an upper fabric layer 11, a middle fabric layer 12 and a lower fabric layer 13 arranged in sequence from top to bottom. Among them, the upper fabric layer 11 is a water absorption and drainage geotextile, and the upper fabric layer 11 includes a first warp yarn and a first weft yarn, and the first warp yarn and / or the first weft yarn include a basic yarn and a wicking fiber, and the wicking fiber is distributed on the basic yarn along the extension direction of the basic yarn. The wicking fiber refers to a fiber with a wicking effect. Adding wicking fibers to the first warp yarn and / or the first weft yarn can make the composite geotextile have a water absorption and drainage function. The water absorption and drainage function here mainly refers to the water being drained from the first end of the basic yarn to the second end along the extension direction of the basic yarn. The wicking fiber is at least selected from the following: polyester, polyvinyl alcohol, glass, polyethylene, polyamide. The first warp yarn and the first weft yarn are woven with a twill weave structure, and a plurality of first perforations are formed between the first warp yarn and the first weft yarn, and the two ends of the first perforation respectively penetrate the upper and lower sides of the upper fabric layer 11. The upper fabric layer 11 itself is water permeable, so part of the water passes through the upper fabric layer 11 through the first perforations, and the other part is discharged in a direction parallel to the upper fabric layer 11 under the action of the wicking fibers.

[0037] The middle fabric layer 12 is a geofilter. The middle fabric layer 12 includes a second warp yarn and a second weft yarn. The second warp yarn and the second weft yarn are woven with a plain weave structure. A plurality of second perforations are formed between the second warp yarn and the second weft yarn. The two ends of the second perforations respectively penetrate the upper and lower sides of the middle fabric layer 12. The equivalent aperture of the second perforations is 2 mm to 3 mm. The second warp yarn and the second weft yarn are both made of solid round core yarn made of low-compressibility polymer material. The low-compressibility polymer is preferably polypropylene. The cross-section of the solid round core yarn is circular. After the second warp yarn and the second weft yarn made of the solid round core yarn are woven, the middle fabric layer 12 can have a higher porosity and improve the in-plane water flow capacity of the middle fabric layer 12 to reduce the water flow in a direction perpendicular to the composite geotextile. The in-plane water flow capacity refers to the water entering the composite geotextile, which flows in a direction parallel to the composite geotextile, that is, in the radial and / or latitudinal direction, driven by the wicking action of the upper fabric layer 11.

[0038] The lower fabric layer 13 is a reinforced geotextile, which is a high modulus woven geotextile woven with high modulus yarn. The high modulus yarn can be glass fiber, polypropylene fiber, polyethylene fiber, polyester filament or other high-strength polymer fiber. The reinforced geotextile has high tensile strength, can prevent soil creep, and can maintain the anti-filtration effect for a long time. Compared with ordinary woven fabrics, although the tensile strength of ordinary woven fabrics is higher, the production process of reinforced geotextiles causes the yarns to cross-bend, and the yarns are greatly deformed after being pulled by force, and the anti-filtration effect will be lost. The reinforced geotextile not only increases the tensile strength of ordinary woven fabrics, but also well maintains the anti-filtration effect of non-woven fabrics, integrating the functions of anti-filtration, soil consolidation, and reinforcement. The lower fabric layer 13 is provided with a plurality of third perforations, both ends of the third perforations pass through the upper and lower sides of the lower fabric layer 13, the equivalent apertures of the second perforations are respectively larger than the equivalent apertures of the first perforations and the third perforations, the first perforations, the second perforations and the third perforations are interconnected, and moisture can pass through the upper fabric layer 11, the middle fabric layer 12 and the lower fabric layer 13.

[0039] The upper fabric layer 11, the middle fabric layer 12 and the lower fabric layer 13 are connected by a mechanical connection structure, and the mechanical connection structure includes at least one of the following: suture connection and polymer rivet 15 riveting. In this embodiment, a dual mechanical connection structure of suture connection and polymer rivet 15 riveting is preferably adopted. Specifically, suture lines 14 are respectively provided on both sides of the composite geotextile, and the suture lines 14 connect the upper fabric layer 11, the middle fabric layer 12 and the lower fabric layer 13 together. A plurality of polymer rivets 15 are provided in the middle of the composite geotextile, and the polymer rivets 15 pass through the upper fabric layer 11 and the middle fabric layer 12 and are connected to the lower fabric layer 13.

[0040] The lengths of the upper fabric layer 11, the middle fabric layer 12 and the lower fabric layer 13 are equal. First bends 16 are respectively provided on both sides of the width direction of the upper fabric layer 11, the first bends 16 extend toward the middle fabric layer 12, and the first bends 16 are sewed and connected to the side wall of the middle fabric layer 12. Second bends 17 are respectively provided on both sides of the width direction of the lower fabric layer 13, the second bends 17 extend toward the middle fabric layer 12, and the second bends 17 are sewed and connected to the side wall of the middle fabric layer 12. The first bends 16 and the second bends 17 can completely cover the side wall of the middle fabric layer 12, and correspondingly, the wicking fibers in the upper fabric layer 11 are arranged on the first warp yarn, so that moisture can be drained away along the warp direction, avoiding the phenomenon that the first bends 16 and the second bends 17 block the moisture from draining away.

[0041] Drainage reinforcement structure embodiment 1

[0042] See also Figure 2The drainage reinforcement structure of this embodiment is used to reinforce dredged spoil materials and drain lateral water in the limited space of the stockpile area. Dredged spoil materials such as dredged silt and clay are very soft and cannot bear structural loads. Dredged spoil materials generally need to be reinforced before use.

[0043] The drainage reinforcement structure of this embodiment includes a ground platform layer 21, a plurality of fence parts 22, a plurality of filling layers 23, a plurality of first drainage reinforcement layers 24 and a plurality of second drainage reinforcement layers 25. The first drainage reinforcement layer 24 and the second drainage reinforcement layer 25 are made of the composite geotextile as in the above-mentioned embodiment. The first drainage reinforcement layer 24 is arranged on the ground platform layer 21 in the horizontal direction, and a plurality of fence parts 22 are arranged on the first drainage reinforcement layer 24 in a stacked manner. A receiving cavity is formed between the lowest fence part 22 and the first drainage reinforcement layer 24, and the dredged soil material is filled in the receiving cavity to form a filling layer 23. The fence part 22 can be a soil bag, and a first drainage reinforcement layer 24 is arranged between two adjacent fence parts 22 in the horizontal direction, so that a receiving cavity is formed in each fence part 22, and the dredged soil material is filled into each receiving cavity layer by layer. The end of each first drainage reinforcement layer 24 protrudes out of the corresponding receiving cavity, which is convenient for processing and lateral drainage of the dredged soil material layer by layer.

[0044] The first drainage reinforcement layer 24 is located between two adjacent first drainage reinforcement layers 24. The middle portion of the second drainage reinforcement layer 25 is arranged along the surface of the fence portion 22 and is located on the inner side wall of the accommodation cavity, and the ends of the second drainage reinforcement layer 25 pass through the upper and lower sides of the fence portion 22 and extend outside the accommodation cavity.

[0045] Composite geotextiles are respectively arranged on the bottom wall, side wall and top wall of the accommodating cavity, which actively absorb and laterally discharge the moisture in the dredged spoil material, thereby reducing the moisture content of the dredged spoil material and solidifying the dredged spoil material, thereby improving the shear strength and material stiffness of the dredged spoil material and improving the reinforcement capacity of the dredged spoil material.

[0046] Drainage reinforcement structure embodiment 2

[0047] See also Figure 3 The drainage reinforcement structure of this embodiment is used to reinforce and drain the embankment on a soft soil foundation. The bottom drainage and construction platform layer of the embankment are generally made of coarse sand or gravel. The drainage reinforcement structure of this embodiment can also be used to make the embankment with natural drainage materials such as medium sand or clay with poor drainage performance.

[0048] The drainage reinforcement structure includes a soft soil base layer 31, a construction platform layer 32, an embankment filling layer 33, a third drainage reinforcement layer 34 and a plurality of drainage channels 35. The third drainage reinforcement layer 34 is made of the composite geotextile as described above. The construction platform layer 32 is arranged on the soft soil base layer 31, and the third drainage reinforcement layer 34 is arranged horizontally between the construction platform layer 32 and the soft soil base layer 31. The end of the third drainage reinforcement layer 34 protrudes out of the construction platform layer 32. The third drainage reinforcement layer 34 can actively absorb the pore water in the embankment filling layer 33 and discharge it in the horizontal direction, which is beneficial to improve the strength of the filling layer and realize the reinforcement of the embankment filling layer 33.

[0049] Generally, during the construction of the embankment, a stable construction platform layer 32 is required to support heavy machinery to install a vertically arranged drainage channel 35. The drainage channel 35 passes through the construction platform layer 32 and is inserted deep into the soft soil base layer 31 or directly into the solid underground layer. The construction of the embankment increases the stress of the soft soil base layer 31, resulting in an increase in the pore water pressure of the soft soil base layer 31. The pore water is drained by installing the drainage channel 35, which is conducive to achieving a rapid increase in the soil strength of the soft soil base layer 31 and accelerating the settlement of the soft soil foundation.

[0050] Drainage reinforcement structure embodiment 3

[0051] See also Figure 4 The drainage reinforcement structure of this embodiment is applied to the reinforcement and lateral drainage of steep slopes and earth walls.

[0052] The drainage reinforcement structure includes original soil 41, backfill soil 42, a fourth drainage reinforcement layer 43, two fifth drainage reinforcement layers 44, multiple reinforced fabric layers 45, multiple earthbags 46 and multiple sixth drainage reinforcement layers 47. The fourth drainage reinforcement layer 43, the fifth drainage reinforcement layer 44 and the sixth drainage reinforcement layer 47 are all made of the above-mentioned composite geotextile.

[0053] The original soil 41 includes a steep slope and a ground layer, the steep slope is inclined on the ground layer, a first inclined surface 412 is provided on the side of the steep slope facing the bottom layer, a first plane 411 is provided on the ground layer, and the first plane 411 intersects the first inclined surface 412. The backfill soil 42 is provided on the first plane 411 and adjacent to the first inclined surface 412, and a plurality of earth bags 46 are arranged along the height direction of the backfill soil 42 on the side facing away from the first inclined surface 412.

[0054] Two fifth drainage reinforcement layers 44 are arranged at the bottom and top of the backfill soil 42. The first end of the fifth drainage reinforcement layer 44 protrudes out of the backfill soil 42 through the earthbag 46, and the second end of the fifth drainage reinforcement layer 44 extends toward the first inclined surface 412. The fifth drainage reinforcement layer 44 located at the bottom is in direct contact with the first plane 411, and is used to directly cut off the capillary rise of the groundwater level. The fifth drainage reinforcement layer 44 located at the top is covered with a thin layer of backfill soil 42, which is used to timely drain the moisture on the surface of the backfill soil 42 laterally.

[0055] The reinforced fabric layer 45 and the sixth drainage reinforcement layer 47 are arranged between the two fifth drainage reinforcement layers 44 along the height direction of the backfill soil 42. The reinforced fabric layer 45 and the sixth drainage reinforcement layer 47 are both located on the side of the backfill soil 42 that faces away from the first inclined surface 412. The first ends of the reinforced fabric layer 45 and the sixth drainage reinforcement layer 47 are bent upward to form an installation cavity 48. A plurality of installation cavities 48 are stacked up and down, and the earthbag 46 is arranged in the installation cavity 48. The second end of the reinforced fabric layer 45 and the second end of the sixth drainage reinforcement layer 47 both extend toward the first inclined surface 412. The extension length of the reinforced fabric layer 45 is greater than the extension length of the sixth drainage reinforcement layer 47, and the extension length of the fifth drainage reinforcement layer 44 is greater than the extension length of the sixth drainage reinforcement layer 47. The second end of the fifth drainage reinforcement layer 44 and the first end of the sixth drainage reinforcement layer 47 protrude out of the backfill soil 42 through the corresponding earthbags 46.

[0056] The fourth drainage reinforcement layer 43 is disposed on the first inclined surface 412, and the first end of the fifth drainage reinforcement layer 44 located at the bottom is connected and conducted to the bottom of the fourth drainage reinforcement layer 43, so that the water drained by the fourth drainage reinforcement layer 43 is discharged to the outside of the backfill soil 42 through the fifth drainage reinforcement layer 44. The second end of the fifth drainage reinforcement layer 44 located at the top is connected to the end of the fourth drainage reinforcement layer 43.

[0057] During rainfall, part of the rainwater seeps into the backfill soil 42. The seeped rainwater passes through the fifth drainage reinforcement layer 44 and multiple sixth drainage reinforcement layers 47. Under the lateral drainage action of the fifth drainage reinforcement layer 44 and multiple sixth drainage reinforcement layers 47, the rainwater is discharged toward the side wall of the backfill soil 42, preventing the rainwater from accumulating inside the backfill soil 42, thereby facilitating improving the strength of the backfill soil 42.

[0058] On a steep slope, the groundwater level penetrates from high to low, and rainfall will increase groundwater seepage, which increases the moisture content at the bottom of the backfill soil 42. By setting the fourth drainage reinforcement layer 43 and the sixth drainage reinforcement layer 47 to be connected, the groundwater on the steep slope can be quickly drained, the moisture content at the bottom of the backfill soil 42 can be reduced, and the strength of the backfill soil 42 can be improved.

[0059] On the ground layer, the groundwater level will rise due to the capillary action of the soil. The fifth drainage reinforcement layer 44 can interrupt the rise of the groundwater level and drain the groundwater in time, thereby preventing the groundwater from entering the backfill soil 42 and improving the strength of the backfill soil 42.

[0060] Drainage reinforcement structure embodiment 4

[0061] See also Figure 5 The drainage reinforcement structure of this embodiment is applied to the reinforcement and lateral drainage of the base cushion layer 52 of the storage tank 53. The storage tank 53 is a storage tank 53 storing hydrocarbons or petrochemical products.

[0062] The drainage reinforcement structure of this embodiment includes a ground support layer 51, a foundation cushion layer 52 and a storage tank 53, and the storage tank 53 is arranged on the ground support layer 51 through the foundation cushion layer 52. The inside of the foundation cushion layer 52 can be filled with sand or gravel, and the surface of the foundation cushion layer 52 is provided with a hard waterproof layer, such as a concrete layer, to prevent rainwater from entering the foundation cushion layer 52. The bottom of the storage tank 53 is embedded in the foundation cushion layer 52, and a water collection ditch 54 is provided on the ground support layer 51, and the water collection ditch 54 is located on the outside of the foundation cushion layer 52. In the vertical direction, the height of the water collection ditch 54 is lower than the foundation cushion layer 52.

[0063] The drainage reinforcement structure also includes two seventh drainage reinforcement layers 55, which are made of the composite geotextile mentioned above. The two seventh drainage reinforcement layers 55 are arranged up and down in the base cushion layer 52 and are located below the storage tank 53. The two seventh drainage reinforcement layers 55 are spaced at a preset distance, and the ends of the seventh drainage reinforcement layers 55 pass through the base cushion layer 52 and are connected to the water collection ditch 54. If the storage tank 53 leaks, the leaked liquid is discharged into the water collection ditch 54 under the dual action of the two seventh drainage reinforcement layers 55, which is convenient for leakage detection and safe removal.

[0064] By adopting the drainage reinforcement structure of this embodiment, there is no need to set up a leakage detection system inside the foundation cushion layer 52, the construction operation is simple and convenient, and the cost can be saved.

[0065] The seventh drainage reinforcement layer 55 is arranged in the horizontal direction. The next seventh drainage reinforcement layer 55 is located on the surface of the ground support layer 51, which is conducive to achieving uniform load distribution, reducing differential ground settlement, and maintaining the structural integrity of the foundation cushion layer 52 for a long time.

[0066] Drainage reinforcement structure embodiment 5

[0067] See also Figure 6 The drainage reinforcement structure of this embodiment is used to reinforce and drain the roadbed 62 when building roads or railways on high-salt ground.

[0068] The drainage reinforcement structure of this embodiment includes a pavement structure layer 61, a road base layer 62 and a salt-containing base layer 63 arranged in sequence from top to bottom, and the pavement structure layer 61 includes a pavement layer 611 and a base layer 612, and the pavement layer 611 is located on the base layer 612. The drainage reinforcement structure also includes an eighth drainage reinforcement layer 64, which is made of the composite geotextile as described above, and is located between the road base layer 62 and the salt-containing base layer 63, and the end of the eighth drainage reinforcement layer 64 protrudes out of the road base layer 62. The eighth drainage reinforcement layer 64 can actively absorb the moisture in the road base layer 62 and discharge it laterally out of the road base layer 62, so as to improve the strength of the road base layer 62 and achieve a reinforcement effect.

[0069] Concrete pipes, steel pipes 65 and other embedded objects are generally arranged in the roadbed 62, and the groundwater in the saline base 63 contains salt. Under the capillary action, the groundwater containing salt will rise and penetrate into the roadbed 62, corroding the embedded objects such as the concrete pipes and steel pipes 65, and affecting the structural stability of the roadbed 62. The eighth drainage reinforcement layer 64 can be used as a soil moisture capillary breaking layer, which can break the capillary rise of groundwater and drain the groundwater in time, prevent the accumulation of salt-containing groundwater in the roadbed 62, protect the concrete pipes and steel pipes 65, and improve the strength of the roadbed 62.

Claims

1. A composite geotextile, comprising an upper fabric layer, a middle fabric layer and a lower fabric layer arranged in sequence from top to bottom, characterized in that: The upper fabric layer is a water-absorbing and drainage geotextile, which includes a first warp yarn and a first weft yarn, wherein the first warp yarn and / or the first weft yarn contain a basic yarn and a wicking fiber, wherein the wicking fiber is distributed on the basic yarn along the extension direction of the basic yarn, so that water is drained from the first end of the basic yarn to the second end thereof along the extension direction of the basic yarn, and a plurality of first perforations are formed between the first warp yarn and the first weft yarn; The middle fabric layer is a geofilter, and the geofilter is provided with a plurality of second perforations; The lower fabric layer is a reinforced geotextile, and the reinforced geotextile is provided with a plurality of third perforations, the apertures of the second perforations are respectively larger than the apertures of the first perforations and the apertures of the third perforations, and the first perforations, the second perforations and the third perforations are interconnected; The middle fabric layer is woven from solid round core yarns made of low-compressibility polymer material.

2. The composite geotextile according to claim 1, characterized in that: The upper fabric layer, the middle fabric layer and the lower fabric layer are connected by a mechanical connection structure, and the mechanical connection structure includes at least one of the following: suture connection and polymer rivet riveting.

3. The composite geotextile according to claim 1 or 2, characterized in that: The upper fabric layer, the middle fabric layer and the lower fabric layer are of equal length; First bending portions are respectively provided on both sides of the upper fabric layer in the width direction, and the first bending portions are connected to the side walls of the middle fabric layer; Second bending portions are respectively provided on both sides of the lower fabric layer in the width direction, and the second bending portions are connected to the side walls of the middle fabric layer.

4. A drainage reinforcement structure, comprising a ground platform layer, a fence portion and a filler layer, wherein the fence portion is arranged on the ground platform layer, a receiving cavity is formed between the fence portion and the ground platform layer, and the filler layer is arranged in the receiving cavity, characterized in that: The drainage reinforcement structure also includes a first drainage reinforcement layer and a second drainage reinforcement layer, the first drainage reinforcement layer and the second drainage reinforcement layer are both made of the composite geotextile as described in any one of claims 1 to 3 above, the first drainage reinforcement layer is arranged at the bottom of the accommodating cavity and is located below the fence portion and the filling layer, the end of the first drainage reinforcement layer protrudes out of the accommodating cavity, the second drainage reinforcement layer is arranged on the side wall of the accommodating cavity, and the two ends of the second drainage reinforcement layer pass through the fence portion and protrude out of the accommodating cavity.

5. A drainage reinforcement structure, comprising a soft soil base, a construction platform layer, a drainage channel and an embankment filling layer, wherein the construction platform layer is located above the soft soil base, the embankment filling layer is located on the construction platform layer, and the drainage channel passes through the construction platform layer and is inserted into the soft soil base, characterized in that: The drainage reinforcement structure also includes a third drainage reinforcement layer, which is made of the composite geotextile as described in any one of claims 1 to 3 above, and is located between the soft soil base layer and the construction platform layer, and the end of the third drainage reinforcement layer protrudes outside the construction platform layer.

6. A drainage reinforcement structure, comprising original soil, backfill soil, a plurality of reinforced fabric layers and a plurality of earthbags, wherein the original soil is provided with a first plane and a first inclined surface, the backfill soil is arranged on the first plane and adjacent to the first inclined surface, a plurality of earthbags are arranged along the height direction of the backfill soil on a side facing away from the first inclined surface, a plurality of the reinforced fabric layers are arranged along the height direction of the backfill soil in the backfill soil and connected to the earthbags, characterized in that: The drainage reinforcement structure also includes a fourth drainage reinforcement layer, two fifth drainage reinforcement layers and multiple sixth drainage reinforcement layers. The fourth drainage reinforcement layer, the fifth drainage reinforcement layer and the sixth drainage reinforcement layer are all made of the composite geotextile as described in any one of claims 1 to 3 above. The fourth drainage reinforcement layer is arranged on the first inclined surface, the two fifth drainage reinforcement layers are arranged at the bottom and top of the backfill soil, the sixth drainage reinforcement layer is located between the two fifth drainage reinforcement layers, the sixth drainage reinforcement layer and the reinforced fabric layer are arranged at intervals, the fifth drainage reinforcement layer located at the bottom is connected and conducted with the fourth drainage reinforcement layer, and the ends of the fifth drainage reinforcement layer and the sixth drainage reinforcement layer respectively protrude out of the backfill soil through the earthbags.

7. A drainage reinforcement structure, comprising a ground support layer, a foundation cushion layer and a storage tank, wherein the storage tank is arranged on the ground support layer through the foundation cushion layer, characterized in that: The ground support layer is provided with a water collecting ditch, and the water collecting ditch is located on the outside of the foundation cushion layer; The drainage reinforcement structure also includes two seventh drainage reinforcement layers, which are made of the composite geotextile as described in any one of claims 1 to 3 above. The two seventh drainage reinforcement layers are arranged in an upper and lower manner in the base cushion layer and are located below the storage tank. The end of the seventh drainage reinforcement layer passes through the base cushion layer and is connected to the drainage ditch.

8. A drainage reinforcement structure, comprising a pavement structure layer, a road base layer and a salt-containing base layer arranged in sequence from top to bottom, characterized in that: The drainage reinforcement structure also includes an eighth drainage reinforcement layer, which is made of the composite geotextile as described in any one of claims 1 to 3 above, and is located between the road base layer and the salt-containing base layer, and the end of the eighth drainage reinforcement layer protrudes outside the road base layer.

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