Sand slope and vehicle testing system

Abstract

The utility model relates to a sand slope and a vehicle testing system, the sand slope comprises a sand layer part, a first sand fixing part and a sand blocking part, the sand layer part is laid on the slope surface of a base layer, the slope surface is arranged in an inclined extending mode in the first direction, and the sand layer part comprises at least two sand layers arranged in the thickness direction of the sand layer part; the layered design is beneficial to dispersing direct impact of external force on the sand layer part, and movement and loss of sand grains are reduced. According to the sand stabilizing device, the first sand stabilizing part is laid between every two adjacent sand layers, in this way, under the action of the gravity of the upper sand layer, the first sand stabilizing part can tightly press the lower sand layer, when the first sand stabilizing part tightly presses the lower sand layer, gaps between sand grains can be reduced, and the sand grains can be more tightly arranged together. The compact arrangement mode can reduce mobility of the sand grains and prevent the sand grains in the sand layer from sliding and losing massively under the action of external force, so that the overall stability of the sand slope can be enhanced, and the test experience of a tester is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a sand slope and vehicle testing system. Background Art

[0002] Under the current off-road vehicle testing conditions, if an off-road vehicle needs to complete desert off-road testing, desert dry pull testing and desert driving experience, the test vehicle can only be transported to a natural desert. However, natural deserts are usually far away from central cities and lack supporting facilities around them. Testers not only need to spend a lot of financial resources and time, but also lack urban network, medical and other resources at the test site. Therefore, in order to facilitate desert off-road testers or enthusiasts, it is planned to build artificial sand slopes in the city and set up sand slope driving, slope rushing and dry pull experience projects.

[0003] In order to avoid the problem that the sand layer of the artificial sand slope frequently reaches the bottom and affects the user experience during use, the laid sand layer needs to have a certain thickness. However, when the sand layer is thicker, the sand fixation scheme used in the artificial sand slope in the related art has poor sand fixation effect, which makes the sand layer of the artificial sand slope prone to sand sliding or quicksand. Utility Model Content

[0004] The embodiment of the present application provides a sand slope, which improves the sand fixation effect of the sand slope and solves the problems of sand sliding or quicksand occurring in the sand layer when the sand layer is thick.

[0005] In order to achieve the above object, according to the first aspect of the present application, a sand slope is provided, which comprises:

[0006] A sand layer portion is used for laying on a slope surface of a base layer, the slope surface is arranged to extend obliquely along a first direction, and the sand layer portion includes at least two sand layers arranged along a thickness direction of the sand layer portion;

[0007] A first sand-fixing portion is laid between two adjacent sand layers.

[0008] Optionally, the first sand fixation part includes a geogrid and a first geotextile stacked along the thickness direction of the sand layer part, and the geogrid and the first geotextile are located between two adjacent sand layers.

[0009] Optionally, the first geotextile is located below the geogrid.

[0010] Optionally, the geogrid has a plurality of grids, each of which has a length L1 and a width L2, wherein 10 cm ≤ L1 ≤ 18 cm, and / or 10 cm ≤ L2 ≤ 18 cm.

[0011] Optionally, a sand retaining portion is further included, wherein the sand retaining portion is extended along the thickness direction of the sand layer portion, and the sand retaining portion is used to be fixed to the base layer and is disposed in the sand layer portion.

[0012] Optionally, the first geotextile comprises at least two geotextile segments, at least two of the geotextile segments are arranged at intervals along the first direction, two adjacent geotextile segments are arranged on both sides of the sand retaining portion, and adjacent ends of two adjacent geotextile segments are adjacent to or in contact with the sand retaining portion; and / or,

[0013] The geogrid includes at least two grid sections, at least two of the grid sections are arranged at intervals along the first direction, two adjacent grid sections are arranged on both sides of the sand retaining part, and adjacent ends of two adjacent grid sections are adjacent to or penetrate the sand retaining part and overlap each other.

[0014] Optionally, a plurality of the sand-trapping portions are provided, and the plurality of the sand-trapping portions are arranged at intervals along the first direction.

[0015] Optionally, along the first direction, a distance between two adjacent sand-trapping portions is L2, wherein 1.5 m ≤ L2 ≤ 2 m.

[0016] Optionally, the sand slope further comprises a gravel layer for laying on the slope surface, and the gravel layer is laid between the sand layer portion and the base layer.

[0017] Optionally, the two adjacent sand layers include a first sand layer closest to the slope surface;

[0018] The sand slope further includes a second sand fixation portion, which is laid between the first sand layer and the gravel layer.

[0019] Optionally, the second sand fixation part includes a second geotextile, and the second geotextile is laid between the first sand layer and the gravel layer.

[0020] Optionally, the thickness of the gravel layer is T4, wherein 10 cm ≤ T4 ≤ 20 cm.

[0021] Optionally, at least two of the sand layers include a first sand layer, a second sand layer and a third sand layer which are arranged in sequence along the thickness direction of the sand layer portion, the first sand layer is arranged closest to the slope surface, the thickness of the first sand layer is T1, the thickness of the second sand layer is T2, and the thickness of the third sand layer is T3, wherein 25cm≤T1≤40cm, and / or 25cm≤T2≤40cm, and / or 35cm≤T3≤50cm.

[0022] Optionally, along the thickness direction of the sand layer portion, an end surface of the sand retaining portion away from the slope surface is flush with an end surface of the second sand layer away from the slope surface; or

[0023] Along the thickness direction of the sand layer portion, the first sand fixing portion laid between the second sand layer and the third sand layer includes a sand fixing end surface away from the slope surface, and the sand fixing end surface is flush with the end surface of the sand retaining portion away from the slope surface.

[0024] Optionally, the sand slope further includes a plurality of fixed piles, the sand retaining portion is fixed to the base layer via the plurality of fixed piles, the plurality of fixed piles are arranged at intervals, and each of the fixed piles is extended along the thickness direction of the sand layer portion.

[0025] Optionally, each of the fixing piles is used to be inserted into the base layer, and the depth of the fixing pile inserted into the base layer is d, wherein d≥30 cm; and / or,

[0026] The end surface of each of the fixing piles away from the slope surface is flush with the end surface of the sand retaining portion away from the slope surface; and / or,

[0027] A buffer is provided on the top of each of the fixed piles, and along the thickness direction of the sand layer portion, the orthographic projection of the fixed pile on the slope surface is within the orthographic projection of the buffer on the slope surface.

[0028] According to a second aspect of the present application, a vehicle testing system is provided, comprising the sand slope as described above.

[0029] In the sand slope of the embodiment of the present application, the sand layer portion is designed to include at least two sand layers. This layered design helps to disperse the direct impact of external forces on the sand layer portion and reduce the movement and loss of sand grains. The first sand-fixing portion is laid between two adjacent sand layers. In this way, under the action of the gravity of the upper sand layer, the first sand-fixing portion can press the sand layer below. When the first sand-fixing portion presses the sand layer below, it will reduce the gaps between the sand grains, so that the sand grains are arranged more closely together. This tight arrangement can reduce the mobility of the sand grains and prevent the sand grains in the sand layer from sliding and losing a large amount under the action of external forces, thereby enhancing the overall stability of the sand slope and improving the test experience of the tester.

[0030] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0032] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0033] Figure 1 is a schematic diagram of the overall structure of a sand slope provided in an exemplary embodiment of the present disclosure;

[0034] Figure 2 is a front view of a sand slope provided in an exemplary embodiment of the present disclosure;

[0035] Figure 3 is a schematic structural diagram of two grid sections provided in an exemplary embodiment of the present disclosure that are overlapped through a sand trap;

[0036] Figure 4 is a schematic structural diagram of a geogrid provided in an exemplary embodiment of the present disclosure;

[0037] Figure 5 It is a schematic structural diagram of a plurality of sand retaining parts provided in an exemplary embodiment of the present disclosure being fixed by fixing piles.

[0038] Description of reference numerals:

[0039] 10. Sand slope;

[0040] 11. sand layer section, 110. sand layer, 111. first sand layer, 112. second sand layer, 113. third sand layer;

[0041] 12. First sand fixation section, 121. Geogrid, 1211. Grid section;

[0042] 13. Sand blocking unit;

[0043] 14. Gravel layer;

[0044] 15. The second sand fixation unit;

[0045] 16. Fixed piles;

[0046] 17. Buffer parts;

[0047] 20. Base layer, 210. Slope surface. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0049] This application provides a sand slope 10, see Figures 1 to 5 The sand slope 10 includes a sand layer portion 11 , a first sand fixation portion 12 and a sand retaining portion 13 .

[0050] The sand layer portion 11 is used to be laid on the slope surface 210 of the base layer 20, and the slope surface 210 is arranged to extend obliquely along the first direction. The sand layer portion 11 includes at least two sand layers 110 arranged along the thickness direction of the sand layer portion 11. The base layer 20 can be a naturally formed slope with a slope surface 210, or it can be an artificially made slope with a slope surface 210. The sand layer portion 11 can include two sand layers 110, or it can include three or more sand layers 110.

[0051] A first sand-fixing part 12 is laid between two adjacent sand layers 110. The first sand-fixing part 12 is arranged so that the friction between the first sand-fixing part 12 and the adjacent sand layers 110 is greater than the friction between the adjacent sand layers 110, which helps to prevent the flow and displacement between the two adjacent sand layers 110 and enhance the stability of the sand layer part 11. The number of the first sand-fixing parts 12 can be set as needed, such as one, two or three, which is not limited in the present application.

[0052] In the sand slope 10 of the embodiment of the present application, the sand layer portion 11 is designed to include at least two sand layers 110. This layered design helps to disperse the direct impact of external forces on the sand layer portion 11, reducing the movement and loss of sand grains. The first sand fixation portion 12 is laid between two adjacent sand layers 110. In this way, under the action of the gravity of the upper sand layer 110, the first sand fixation portion 12 can press the sand layer 110 below. When the first sand fixation portion 12 presses the sand layer 110 below, it will reduce the gaps between the sand grains, so that the sand grains are arranged more closely together. This tight arrangement can reduce the mobility of the sand grains, prevent the sand grains in the sand layer 110 from sliding and losing in large quantities under the action of external forces, thereby enhancing the overall stability of the sand slope 10 and improving the test experience of the tester.

[0053] In some embodiments, the first sand fixation part 12 includes a geogrid 121 and a first geotextile stacked along the thickness direction of the sand layer part 11, and the geogrid 121 and the first geotextile are located between two adjacent sand layers 110. Since the geogrid 121 has high tensile strength and stability, placing it between adjacent sand layers 110 can significantly enhance the overall stability of the sand slope and effectively prevent sliding and loss between the sand layers 110. The grid structure of the geogrid 121 can be closely combined with the sand layer 110 to form a stable whole, reducing the erosion and damage of the sand layer part 11 under at least one of the external forces applied by wind, water flow and vehicle testing. The first geotextile has good filtering performance, which can prevent sand particles from being lost with the water flow, while allowing water to pass through, which can not only enhance the friction of the sand layer, but also filter water, which helps to maintain the integrity and stability of the sand slope 10. The stacking arrangement of the geogrid 121 and the first geotextile can adjust the permeability of the sand slope to a certain extent. This design allows moisture and air to flow freely between the sand layers 110, which is beneficial to the moisture balance inside the sand slope 10. The combined use of the geogrid 121 and the first geotextile can increase the bearing capacity of the sand slope 10, allowing the sand slope to withstand greater pressure and load, such as vehicles will not be easily damaged or deformed.

[0054] It should be noted that the geogrid 121 can be stacked on the first geotextile, or the geogrid 121 can be stacked under the first geotextile. In some examples, the first geotextile is laid under the geogrid 121. Since the geogrid 121 has a large structural strength and a small contact area with the sand, the friction between the geogrid 121 and the sand layer 110 is small, while the first geotextile has a large contact area with the sand, so the friction between the first geotextile and the sand layer 110 is large, which can increase the anti-slip ability of the sand layer 110.

[0055] The first geotextile adopts a fabric that is water-tight and sand-proof. The fabric of the first geotextile can be set as needed. For example, the first geotextile can include polyester fiber non-woven fabric or PVC coated anti-sand fabric. Polyester fiber non-woven fabric has good water permeability and air permeability, which can effectively prevent sand loss while allowing water to pass freely. PVC coated anti-sand fabric is made by coating PVC (polyvinyl chloride) coating on the base fabric, and has excellent waterproof and anti-sand properties. It can effectively prevent sand loss while allowing water to pass.

[0056] In one embodiment, the geogrid 121 has a plurality of grids, each of which has a length L1 and a width L2, wherein 10 cm ≤ L1 ≤ 18 cm, and / or 10 cm ≤ L2 ≤ 18 cm. Within this size range, the grids of the geogrid 121 can maintain good mechanical properties and stability. A grid that is too small may cause the material to be too dense, affecting its flexibility and ductility; while a grid that is too large may weaken its overall bearing capacity. This size range enables the grid to effectively disperse and transfer loads, thereby improving the bearing capacity and stability of the sand slope 10. Within this size range, the grid size of the geogrid 121 is moderate, which can maintain a certain degree of permeability while providing good stability. Permeability helps to drain water and prevent moisture accumulation, while stability can resist external loads and deformation.

[0057] In some examples, the length of the grid can be 10 cm, 11 cm, 11.6 cm, 12.8 cm, 13.4 cm, 14 cm, 14.9 cm, 15 cm, 15.9 cm, 16.5 cm, 17.6 cm, or 18 cm, etc., and the width of the grid can be 10 cm, 11 cm, 12 cm, 12.8 cm, 13.4 cm, 14 cm, 14.9 cm, 15 cm, 15.9 cm, 16.5 cm, 17.6 cm, or 18 cm, etc. The length and width of the grid can be selected as needed, and this application is not limited thereto.

[0058] In some embodiments, the sand slope 10 also includes a sand retaining portion 13, which is extended along the thickness direction of the sand layer portion 11. The sand retaining portion 13 is used to be fixed to the base layer 20 and is arranged in the sand layer portion 11. The sand retaining portion 13 can effectively block the movement of sand particles in a direction parallel to the slope surface, weaken or avoid sand sliding or quicksand in the sand layer portion 11, and tightly combine the sand layer 110 with the base layer 20, thereby enhancing the overall stability of the sand slope 10 and improving the test experience of the tester.

[0059] There are many types of sand trapping parts 13. For example, in one embodiment, the sand trapping part 13 may include a sand trapping net. The hole diameter of the sand trapping net is similar to the diameter of the sand grains, such as the hole diameter of the sand trapping net is slightly smaller than or equal to the diameter of the sand grains. In this way, the sand cannot pass through the mesh too easily, and can only pass through the mesh under the action of external force. Exemplarily, in some embodiments, the hole diameter of the mesh is about 0.15 mm. Of course, in other embodiments, the hole diameter of the mesh can be set as needed. The number of sand trapping parts 13 can be set as needed, such as one, two, three or more, and this application does not limit this.

[0060] It should be noted that, in other embodiments, the sand-trapping portion 13 may also include a sand-trapping cloth or a sand-trapping grille, etc. The specific type of the sand-trapping portion 13 may be selected as needed, and the present application does not limit this.

[0061] In some embodiments, the first geotextile includes at least two geotextile segments, at least two geotextile segments are arranged at intervals along the first direction, and two adjacent geotextile segments are arranged on both sides of the sand retaining portion 13, so that the installation of the sand retaining portion 13 is convenient. The adjacent ends of the two adjacent geotextile segments are adjacent to or in contact with the sand retaining portion 13. On the one hand, the two adjacent geotextile segments and the sand retaining portion 13 form a stable sand fixing structure, which can effectively prevent the sliding and loss of a large amount of sand grains in the sand layer 110, thereby enhancing the stability of the entire sand slope 10. On the other hand, the sand retaining portion 13 can be more tightly fixed between the sand layers 110, which not only enhances the fixing effect of the sand retaining portion 13, but also further improves the overall stability of the sand slope 10. The segmented geotextile is more flexible when laid, which greatly simplifies the construction process and improves the construction efficiency.

[0062] In some embodiments, the geogrid 121 includes at least two grid sections 1211, at least two grid sections 1211 are arranged at intervals along the first direction, two adjacent grid sections 1211 are arranged on both sides of the sand retaining part 13, and the adjacent ends of the two adjacent grid sections 1211 are adjacent or penetrated through the sand retaining part 13 and overlap each other. In this way, since each grid section 1211 can be subjected to force individually, it is possible to disperse stress more evenly and avoid stress concentration, thereby improving the bearing capacity of the entire sand slope 10. The segmented geogrid 121 is more flexible during construction. Adjacent grid sections 1211 can overlap each other through the sand retaining part 13. This connection method is simple and fast, and improves construction efficiency. The segmented geogrid 121 can better adapt to the deformation and settlement of the sand layer part 11. Since each grid section 1211 can work independently, even if the sand layer part 11 undergoes a certain degree of deformation or settlement, it will not cause serious impact on the entire sand layer part 11.

[0063] In some embodiments, a plurality of sand-trapping sections 13 are provided, and the plurality of sand-trapping sections 13 can form a multi-layered sand-trapping barrier, which can more effectively intercept and reduce the loss of sand particles. The plurality of sand-trapping sections 13 can form a stable sand-trapping structure, and the sand-trapping structure can disperse and transfer the pressure of the sand layer 110, reduce the stress burden of a single sand-trapping section 13, and thus improve the stability of the entire sand-trapping structure. The plurality of sand-trapping sections 13 are arranged at intervals along the first direction. Compared with one sand-trapping section, the sand layer portion will not be squeezed to a certain height after being stressed, but the sand layer portion will be intercepted at different heights on the slope surface, so that the sand layer portion can be more evenly distributed at different heights, which is beneficial to the sand fixation of the sand layer portion and the testing of the vehicle.

[0064] In some embodiments, along the first direction, the distance between two adjacent sand-trapping sections 13 is L2, wherein 1.5m≤L2≤2m, so that a plurality of sand-trapping sections 13 can jointly form a stable sand-trapping structure, thereby effectively intercepting sand loss and optimizing the sand-trapping effect. The distance of 1.5m to 2m allows for an appropriate spacing between two adjacent sand-trapping sections 13, and can reduce the excessive pressure caused by sand accumulation, thereby alleviating the stress burden of the sand-trapping section 13, helping to maintain the stability of the sand-trapping section 13, and reducing deformation or damage of the sand-trapping section 13 caused by long-term stress. The distance of 1.5m to 2m makes it more convenient for construction personnel to install, adjust, and replace the sand-trapping section 13, thereby improving construction efficiency and maintenance convenience. In addition, the distance of 1.5m to 2m can reduce the usage and cost of the sand-trapping section 13 while ensuring the sand-trapping effect and structural stability.

[0065] Specifically, the distance between two adjacent sand-trapping portions 13 may be 1.5 m, 1.6 m, 1.65 m, 1.7 m, 1.74 m, 1.79 m, 1.8 m, 1.85 m, 1.86 m, 1.9 m, 1.95 m or 2 m, etc. The distance between two adjacent sand-trapping portions 13 may be set as needed, and the present application does not limit this.

[0066] In some embodiments, the sand slope 10 also includes a gravel layer 14 for laying on the slope surface 210. The gravel layer 14 is laid between the sand layer 11 and the base layer 20. In this way, due to the large particle size of the gravel, the gaps between them can bite each other to form a stable structure, which can effectively drain water and effectively prevent the sand layer 11 from sliding or losing.

[0067] In some embodiments, two adjacent sand layers 110 include a first sand layer 111 closest to the slope surface 210, and the sand slope 10 further includes a second sand fixation portion 15, which is laid between the first sand layer 111 and the gravel layer 14. The second sand fixation portion 15 can provide a large friction force between the first sand layer 111 and the second sand fixation portion 15, thereby preventing a large amount of sand grains in the first sand layer 111 from sliding relative to the second sand fixation portion 15. In addition, the second sand fixation portion 15 and the gravel layer 14 also have a large friction force, thereby preventing the second sand fixation portion 15 from sliding relative to the gravel layer 14, thereby improving the sand fixation effect on the first sand layer 111.

[0068] In one embodiment, the second sand fixation part 15 includes a second geotextile, which is used to be laid between the first sand layer 111 and the gravel layer 14. In this way, the second geotextile can be closely combined with the first sand layer 111 and the gravel layer 14 to form a whole, which can effectively enhance the stability of the entire sand slope 10. The second geotextile has a good isolation effect, which can effectively prevent the mud and sand in the sand layer 110 from penetrating into the gravel layer 14, maintain the integrity of the gravel layer 14, and always have a large friction between the gravel layer 14 and the second geotextile, thereby maintaining the stability and durability of the sand slope 10. The tensile strength and tear resistance of the second geotextile enable it to withstand certain external forces, thereby effectively preventing the sand slope 10 from being destroyed or collapsed. The second geotextile has a certain water permeability, which can ensure that water is smoothly discharged between the sand layer 110 and the gravel layer 14, that is, the setting of the second geotextile is realized without affecting the drainage of the sand slope while effectively preventing the sand grains of the sand layer 110 from sliding and losing in large quantities.

[0069] It should be noted that the second geotextile can be provided with one layer or multiple layers. The specific number of layers of the second geotextile can be selected as needed, and this application does not limit this. In addition, the second geotextile needs to meet the requirements of being able to leak water and preventing a large amount of sand from falling into the gap of the gravel layer 14. In some examples, the second geotextile uses a national standard 200g geotextile, that is, a geotextile with a weight of 200 grams per square meter.

[0070] The second sand fixation part 15 includes a cloth that can leak water and prevent sand. Specifically, there are many kinds of cloth that can leak water and prevent sand. For example, the second sand fixation part 15 can also include polyester fiber non-woven fabric or PVC coated anti-sand fabric. Polyester fiber non-woven fabric has good water permeability and air permeability, can effectively prevent sand loss, and allow water to pass freely. PVC coated anti-sand fabric is made by coating PVC (polyvinyl chloride) coating on base fabric, and has excellent waterproof and anti-sand performance. It can effectively prevent sand loss and allow water to pass.

[0071] In some embodiments, the thickness of the gravel layer 14 is T4, wherein 10 cm ≤ T4 ≤ 20 cm. Thus, since the gravel layer 14 is an important component of the sand slope 10, its thickness within this range can provide good support and stability. A gravel layer 14 that is too thin may not provide sufficient support, while a gravel layer 14 that is too thick may increase costs and be detrimental to drainage. An appropriate thickness of the gravel layer 14 can ensure that moisture is smoothly discharged between the sand layer 110 and the base layer 20, reducing moisture accumulation. By setting an appropriate thickness of the gravel layer 14, the material cost can be reduced while ensuring structural stability and sand fixation effects.

[0072] In some embodiments, at least two sand layers 110 include a first sand layer 111, a second sand layer 112, and a third sand layer 113 sequentially arranged along the thickness direction of the sand layer portion 11, the first sand layer 111 is arranged closest to the slope surface 210, the thickness of the first sand layer 111 is T1, the thickness of the second sand layer 112 is T2, and the thickness of the third sand layer 113 is T3, wherein 25cm≤T1≤40cm, and / or 25cm≤T2≤40cm, and / or 35cm≤T3≤50cm, thus simulating the multi-layer structure of the sand layer 110 in a desert environment. This structure can simulate the properties of sand at different depths in the desert, such as compactness, humidity, etc., so as to more realistically reflect the characteristics of the desert environment and facilitate subsequent performance testing of vehicles in the desert environment.

[0073] It should be noted that the third sand layer 113 can simulate the contact between the desert and the vehicle. The thickness of the first sand layer 111, the second sand layer 112 and the third sand layer 113 can be selected or met at the same time. When all three are met at the same time, the simulation effect of the desert environment is the best. In addition, by combining the first sand layer 111, the second sand layer 112 and the third sand layer 113 with the sand fixing part and the sand blocking part 13, the collapse of the sand layer 110 or a large amount of water can be avoided, and a stable and realistic simulated desert environment can be constructed.

[0074] Specifically, the thickness of the first sand layer 111 may be 25 cm, 26 cm, 29 cm, 30 cm, 33 cm, 35 cm, 36 cm, 38 cm, or 40 cm. The thickness of the second sand layer 112 may be 25 cm, 27 cm, 28 cm, 30 cm, 33 cm, 35 cm, 36 cm, 39 cm, or 40 cm. The thickness of the third sand layer 113 may be 35 cm, 37 cm, 38 cm, 40 cm, 42 cm, 44 cm, 47 cm, 49 cm, or 50 cm.

[0075] In some embodiments, along the thickness direction of the sand layer portion 11, the end surface of the sand retaining portion 13 away from the slope surface 210 is flush with the end surface of the second sand layer 112 away from the slope surface 210. In this way, since the first sand fixing portion 12 is laid on the upper surface of the second sand layer 112, when the end surface of the sand retaining portion 13 away from the slope surface 210 is flush with the end surface of the second sand layer 112 away from the slope surface 210, the sand retaining portion 13 and the first sand fixing portion 12 can be tightly attached to each other, thereby forming a more stable sand fixing structure, thereby preventing the sand in the first sand layer 111 and the second sand layer 112 from sliding and losing a large amount of sand during vehicle testing, causing the sand layer portion 11 to collapse, and at the same time, it will not affect the testing of the top third sand layer 113 and the vehicle. In some embodiments, along the thickness direction of the sand layer portion 11, the end surface of the sand retaining portion 13 away from the slope surface 210 is flush with the end surface of the first sand fixing portion 12 laid between the second sand layer 112 and the third sand layer 113 away from the slope surface 210. In this way, during the laying process, it is necessary to extend the upper end of the first sand fixing portion 12 into the first sand fixing portion 12, thereby increasing the contact area between the sand retaining portion 13 and the first sand fixing portion 12. The increased contact area means that the sand retaining portion 13 is more tightly connected to the first sand fixing portion 12. After the sand retaining portion 13 is tightly connected to the first sand fixing portion 12, a continuous protective layer is formed. This protective layer covers the first sand layer 111 and the second sand layer 112, so that it can effectively intercept and fix the flowing sand in the first sand layer 111 and the second sand layer 112, thereby improving the stability of the sand slope 10, and at the same time will not affect the testing of the top third sand layer 113 and the vehicle.

[0076] In some embodiments, the sand slope further includes a plurality of fixed piles 16, and the sand retaining portion 13 is fixed to the base layer 20 through the plurality of fixed piles 16. The plurality of fixed piles 16 are arranged at intervals, and each fixed pile 16 is arranged to extend along the thickness direction of the sand layer 11. The arrangement of the fixed piles 16 can ensure that the sand retaining portion 13 is stably fixed on the base layer 20, and prevent the sand retaining portion 13 from being displaced or deformed due to external forces such as water flow, gravity of the sand layer 110, or vehicle pressure. The fixed piles 16 extending along the thickness direction of the sand layer 11 can penetrate into the sand layer 110, provide more solid support, and thus enhance the sand fixation effect of the sand retaining portion 13. The fixed piles 16 arranged at intervals can ensure that the sand retaining portion 13 can be evenly distributed when subjected to force, and avoid structural damage caused by excessive force on a single point.

[0077] It should be noted that there are many ways to connect the sand trap 13 to the fixed pile 16. In some examples, the sand trap 13 can be directly fixed to the fixed pile 16 using thin wires, iron wires or ropes. In some other examples, the sand trap 13 can also be directly fixed to the fixed pile 16 using a threaded structure, a buckle structure, etc. The present application does not limit the way in which the sand trap 13 is fixed to the fixed pile 16.

[0078] The distance between two adjacent fixed piles 16 can be set as needed. In some examples, the distance between two adjacent fixed piles 16 is 6m, which is convenient for vehicles to avoid the fixed piles 16. Of course, in some other examples, the distance between two adjacent fixed piles 16 can be set according to the distance of the specific lane, and the present application does not limit this. Along the thickness direction of the sand fixation portion, the size of the orthographic projection of the fixed pile 16 on the slope surface 210 can be set as needed. In some examples, the size of the orthographic projection of the fixed pile 16 on the slope surface 210 is 3cmx3cm. Of course, in some other examples, the size of the orthographic projection of the fixed pile 16 on the slope surface 210 can be selected as needed, such as 3cmx4cm or 4cmx4cm, etc., and the present application does not limit this.

[0079] In some embodiments, each fixed pile 16 is inserted into the base layer 20, and the depth of the fixed pile 16 inserted into the base layer 20 is d, where d≥30 cm. In this way, the depth of the fixed pile 16 inserted into the base layer 20 reaches or exceeds 30 cm, which can ensure that a firm connection is formed between the fixed pile 16 and the base layer 20. This depth setting enables the fixed pile 16 to penetrate into the relatively stable base layer 20, thereby providing a stronger supporting force and effectively preventing the sand retaining portion 13 from shifting or deforming due to external forces. Sufficient insertion depth (d≥30 cm) means that the contact area between the fixed pile 16 and the base layer 20 is larger, so that a larger load can be dispersed and borne, thereby ensuring that the sand retaining portion 13 remains stable when subjected to external forces.

[0080] In some embodiments, the end face of each fixed pile 16 away from the slope surface 210 is flush with the end face of the sand-trapping portion 13 away from the slope surface 210, which can ensure that when the fixed pile 16 fixes the sand-trapping portion 13, the sand-trapping portion 13 can be tightly attached to the fixed pile 16 to form a tight connection. This design can enhance the connection strength between the fixed pile 16 and the sand-trapping portion 13, and effectively prevent the sand-trapping portion 13 from shifting or deforming under the action of external force. Since the wheels of the vehicle are mainly in contact with the third sand layer 113 when the end face of the fixed pile 16 is flush with the end face of the sand-trapping portion 13, the fixed pile 16 can be prevented from extending into the third sand layer 113. Therefore, the vehicle traveling on the third sand layer 113 will not come into direct contact with the fixed pile 16, which can prevent the wheels from being damaged or punctured by the fixed pile 16 during driving, thereby ensuring the safe driving of the vehicle.

[0081] It should be noted that the material of the fixing pile 16 can be set as needed, for example, the material of the fixing pile 16 can be cement, wood, plastic or metal, etc. The present application does not limit the material of the fixing pile 16.

[0082] In some embodiments, a buffer 17 is provided at the top of each fixed pile 16, and along the thickness direction of the sand layer portion 11, the orthographic projection of the fixed pile 16 on the slope surface 210 is within the orthographic projection of the buffer 17 on the slope surface 210, so that when a vehicle passes by, especially when the wheel approaches or contacts the fixed pile 16, the buffer 17 will first bear the impact force, thereby reducing direct damage to the wheel. This design can effectively prevent the wheel from directly contacting the hard fixed pile 16, reducing the risk of wheel damage. Since the orthographic projection of the fixed pile 16 on the slope surface 210 is within the orthographic projection of the buffer 17 on the slope surface 210, this means that the actual exposed part of the fixed pile 16 (i.e., the part that may contact the wheel) is completely covered or wrapped by the buffer 17. In this way, even if the wheel is close to the position of the fixed pile 16, it will first contact the buffer 17 instead of directly hitting the fixed pile 16 itself.

[0083] In some examples, the size of the buffer 17 is 8 cm×4 cm×0.8 cm. Of course, in some other examples, the area of ​​the orthographic projection of the buffer 17 on the slope surface 210 is 2 times, 3 times, 3.5 times or even more times the area of ​​the orthographic projection of the fixing pile 16 on the slope surface 210, which is not limited in the present application.

[0084] It should be noted that the buffer member 17 is made of a material with certain elasticity and toughness, such as rubber, elastic plastic, wood or bamboo, etc. These materials can deform when impacted, absorb the impact force, and then return to their original shape, thereby providing a continuous buffering effect.

[0085] It is understandable that, in some examples, the buffer 17 is made of a material with a certain elasticity, and the size of the buffer 17 can be the same as the size of the fixing pile 16 , that is, the orthographic projections of the buffer 17 and the fixing pile 16 on the slope surface 210 coincide.

[0086] The embodiment of the present application also provides a vehicle testing system, which includes the above-mentioned sand slope. The vehicle testing system has all the beneficial effects of the above-mentioned vehicle, which will not be described in detail in this disclosure.

[0087] In some embodiments, the vehicle testing system further includes a test vehicle and a monitoring device. The test vehicle is suitable for driving on a sand slope, which can simulate the vehicle driving in a desert environment. The monitoring device monitors various parameters of the vehicle while driving. The off-road capability, climbing capability and performance of the four-wheel drive system of the test vehicle can be evaluated based on the various parameters.

[0088] It should be noted that the various parameter indicators include the vehicle's driving speed, acceleration, steering angle, etc. when driving on a sand slope.

[0089] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0091] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0092] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A sand slope, characterized in that: include: A sand layer portion is used for laying on a slope surface of a base layer, the slope surface is arranged to extend obliquely along a first direction, and the sand layer portion includes at least two sand layers arranged along a thickness direction of the sand layer portion; A first sand-fixing portion is laid between two adjacent sand layers.

2. The sand slope according to claim 1, characterized in that: The first sand fixation part includes a geogrid and a first geotextile stacked along the thickness direction of the sand layer part, and the geogrid and the first geotextile are located between two adjacent sand layers.

3. The sand slope according to claim 2, characterized in that: The first geotextile is located below the geogrid.

4. The sand slope according to claim 2, characterized in that: The geogrid has a plurality of grids, each of which has a length L1 and a width L2, wherein 10 cm ≤ L1 ≤ 18 cm, and / or 10 cm ≤ L2 ≤ 18 cm.

5. The sand slope according to claim 2, characterized in that: It also includes a sand retaining portion, which is extended along the thickness direction of the sand layer portion, and is used to be fixed to the base layer and is arranged in the sand layer portion.

6. The sand slope according to claim 5, characterized in that: The first geotextile comprises at least two geotextile segments, at least two of the geotextile segments are arranged at intervals along the first direction, two adjacent geotextile segments are arranged on both sides of the sand retaining portion, and adjacent ends of two adjacent geotextile segments are adjacent to or in contact with the sand retaining portion; and / or, The geogrid includes at least two grid sections, at least two of the grid sections are arranged at intervals along the first direction, two adjacent grid sections are arranged on both sides of the sand retaining part, and adjacent ends of two adjacent grid sections are adjacent to or penetrate the sand retaining part and overlap each other.

7. The sand slope according to claim 5, characterized in that: A plurality of the sand-trapping portions are provided, and the plurality of the sand-trapping portions are spaced apart along the first direction.

8. The sand slope according to claim 7, characterized in that: Along the first direction, the distance between two adjacent sand-trapping parts is L2, wherein 1.5m≤L2≤2m.

9. The sand slope according to any one of claims 1 to 8, characterized in that: The sand slope also includes a crushed stone layer for laying on the slope surface, and the crushed stone layer is laid between the sand layer part and the base layer.

10. The sand slope according to claim 9, characterized in that: The two adjacent sand layers include a first sand layer closest to the slope surface; The sand slope further includes a second sand fixation portion, which is laid between the first sand layer and the gravel layer.

11. The sand slope according to claim 10, characterized in that: The second sand-fixing part includes a second geotextile, and the second geotextile is laid between the first sand layer and the gravel layer.

12. The sand slope according to claim 9, characterized in that: The thickness of the gravel layer is T4, wherein 10 cm ≤ T4 ≤ 20 cm.

13. The sand slope according to any one of claims 5 to 8, characterized in that: At least two of the sand layers include a first sand layer, a second sand layer and a third sand layer which are arranged in sequence along the thickness direction of the sand layer portion, the first sand layer is arranged closest to the slope surface, the thickness of the first sand layer is T1, the thickness of the second sand layer is T2, and the thickness of the third sand layer is T3, wherein 25cm≤T1≤40cm, and / or 25cm≤T2≤40cm, and / or 35cm≤T3≤50cm.

14. The sand slope according to claim 13, characterized in that: Along the thickness direction of the sand layer, an end surface of the sand retaining portion away from the slope surface is flush with an end surface of the second sand layer away from the slope surface; or Along the thickness direction of the sand layer portion, the first sand fixing portion laid between the second sand layer and the third sand layer includes a sand fixing end surface away from the slope surface, and the sand fixing end surface is flush with the end surface of the sand retaining portion away from the slope surface.

15. The sand slope according to any one of claims 5 to 8, characterized in that: The sand slope further comprises a plurality of fixing piles, the sand retaining portion is fixed to the base layer via the plurality of fixing piles, the plurality of fixing piles are arranged at intervals, and each of the fixing piles is extended along the thickness direction of the sand layer portion.

16. The sand slope according to claim 15, characterized in that: Each of the fixing piles is used to be inserted into the base layer, and the depth of the fixing pile inserted into the base layer is d, wherein d≥30 cm; and / or, The end surface of each of the fixing piles away from the slope surface is flush with the end surface of the sand retaining portion away from the slope surface; and / or, A buffer is provided on the top of each of the fixed piles, and along the thickness direction of the sand layer portion, the orthographic projection of the fixed pile on the slope surface is within the orthographic projection of the buffer on the slope surface.

17. A vehicle testing system, characterized in that: Including the sand slope described in any one of claims 1 to 16.

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