Wall back water collecting well communicating type gravity type water-permeable ecological retaining wall

Abstract

The invention relates to a wall back water-collecting well communicated gravity type permeable ecological retaining wall which comprises a retaining wall body and a wall back arranged behind the retaining wall body, the wall back is integrally provided with an inverted filter layer, a plurality of gravel filled water-collecting wells are arranged on the front side of the inverted filter layer 7 in the length direction of the retaining wall, each water-collecting well is of a semi-cylindrical structure, one side of each water-collecting well is a rectangular section, and the other side of each water-collecting well is a rectangular section. The rectangular section is tightly attached to the inverted filter wall face, and a plurality of installation holes used for being connected with an inclined drainage pipe are formed in the front end of the water collecting well in the height direction. The adjacent water-collecting wells filled with the broken stones are communicated through communicating pipes among the water-collecting wells; a clay layer is arranged below each gravel-filled water collecting well; a plurality of rows of plant-growing notch grooves are formed in the front side inclined face of the retaining wall body, and a plurality of drainage holes are formed in the side walls of the plant-growing notch grooves. The integration of efficient water permeability, skid resistance and ecology of the gravity type retaining wall is achieved, and the prevention and control level and ecological environmental protection value of landslide geological disasters are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of geological disaster prevention and control, and specifically is a gravity-type permeable ecological retaining wall with a wall-back water collection well connected. Background Art

[0002] In slope prevention and control projects, gravity retaining walls are often widely used due to their good stability and simple structure. Gravity retaining walls are the most common retaining structure for landslide control or slope reinforcement. Gravity retaining walls rely on their own gravity to maintain stability and use the weight of the wall to resist the pressure of the soil behind the retaining wall. Under conditions of heavy rainfall, gravity retaining walls often become unstable due to poor drainage, so their permeability must be fully considered when designing gravity retaining walls. The design of many gravity retaining walls often directly connects the inclined drainage pipe to the soil. This practice may not only block the pipe, but also the drainage capacity of the inclined drainage pipe is very limited. Under conditions of heavy rainfall, instability is likely to occur. Such as:

[0003] Invention patent CN 110714479 A discloses a permeable gravity retaining wall structure with embedded gravel columns. Gravel columns are embedded in the retaining wall, and graded sand filter layer backfill is used between concrete and slope soil. Drainage channels are provided on the front wall and the rear wall. The drainage channels connect the embedded gravel columns and the graded sand filter layer backfill. Two rows of upper and lower inclined drainage pipes are also provided at the bottom of the front wall. Due to the limited drainage capacity of the inclined drainage pipes, the soil behind the wall is prone to cause greater pressure on the wall, and it is difficult to ensure the stability of the retaining wall during heavy rainfall.

[0004] Invention patent CN 110714478 A discloses a permeable grid-type gravity ecological retaining wall structure, which adopts the method of integrally casting the grid concrete with the base and the front wall, and setting different graded fill in the grid concrete, and setting drainage gaps on each grid, and setting two rows of inclined drainage pipes at the bottom of the front wall. The setting of the inclined drainage pipes is not only easy to be blocked, but also if the drainage effect is not ideal in a short time, in heavy rainy weather, the water flow in the inclined drainage pipes below cannot play a role in a short time, and the drainage volume is small, and it is impossible to reduce the soil pressure behind the wall in a short time.

[0005] Invention patent CN 110397050A is a new type of beam-anchored lightweight drainage retaining wall and its construction method. The main wall of the invention is provided with multiple rows of drainage holes, which are connected to the corresponding water collection wells through water pipes. Since the water collection wells are relatively independent, the amount of water flowing into the wells during heavy rainfall may be greater than the drainage amount, and the wells are not connected. During heavy rain, it is easy to form a large water pressure behind the wall, thereby affecting its stability.

[0006] Invention patent CN 110397049 A is a buttress retaining wall with drainage function and its construction method. In the invention, groundwater in the retaining body enters the gravel sump through the water pipe and is then discharged through the drainage hole. The water pipe is in the form of a water pipe, which is prone to blockage in heavy rainfall weather. The drainage capacity is limited and it is difficult to cope with heavy rainfall weather.

[0007] In the above literature, the inclined drainage pipe is connected to the soil behind the retaining wall through an inclined drainage pipe. This approach is theoretically feasible, but it is easy to become unstable under extreme climatic conditions. The amount of water that can be discharged by the inclined drainage pipe is very limited, and the water in the soil behind the wall cannot be discharged in time. At the same time, the inclined drainage pipe connected to the soil is more prone to blockage, which will cause greater pressure on the retaining wall and seriously affect the stability of the retaining wall. On the other hand, in order to make the water collection well adapt to heavy rainfall weather, the size of the water collection well needs to be increased, but increasing the diameter of the water collection well will affect the structural integrity and bulk density of the retaining wall, and it is difficult to find a balance between the two. In addition, in many ecological retaining walls, the vegetation often has poor durability due to water shortage and other reasons, and it is impossible to achieve the coordination and unity of the four aspects of smooth drainage of the retaining wall, good structural integrity, high bulk density and good durability of wall vegetation.

[0008] In order to solve the above problems, the present invention proposes a permeable ecological retaining wall which can ensure the integrity of the gravity retaining wall structure, large bulk capacity, strong water permeability and sufficient water supply to the vegetation belt. Summary of the invention

[0009] The present invention aims to solve the technical problem of coordinated unification of smooth drainage, good structural integrity, large capacity and good durability of wall vegetation in the retaining wall, to achieve efficient water permeability, anti-slip and ecological integration of gravity retaining walls, and to improve the prevention and control level of landslide geological disasters and the ecological and environmental protection value.

[0010] To achieve the above object, the technical solution adopted by the present invention is:

[0011] A gravity-type permeable ecological retaining wall with a water collection well connected to the back of the wall, comprising a retaining wall body and a wall back arranged behind the retaining wall body, wherein the wall back is provided with an inverted filter layer as a whole, and a plurality of water collection wells 10 filled with crushed stones are arranged on the front side of the inverted filter layer 7 along the length direction of the retaining wall, wherein the water collection well is a semi-cylindrical structure, one side of which is a rectangular cross section, and the rectangular cross section is closely attached to the wall surface of the inverted filter layer, and a plurality of mounting holes for connecting an upward inclined drainage pipe 5 are arranged at the front end of the water collection well along the height direction; adjacent water collection wells 10 filled with crushed stones are connected by an inter-water collection well connecting pipe 8;

[0012] A clay layer is provided under each gravel-filled water collection well, and the bottom of the clay layer is flush with the bottom of the back-wall filter layer 7;

[0013] A plurality of rows of vegetation grooves are arranged on the front inclined surface of the retaining wall body, and a plurality of drainage holes are arranged on the side walls of the vegetation grooves, each drainage hole is connected to the water outlet end of an upward inclined drainage pipe 5, and the water inlet end of the upward inclined drainage pipe 5 is connected to the installation hole at the front end of the water collection well correspondingly;

[0014] The water outlet end of the upwardly inclined drainage pipe 5 is lower than the water inlet end, and the water outlet end is connected to the vegetation groove 4 on the front inclined surface, and the vegetation groove 4 is planted with vine plants 2.

[0015] Furthermore, the water inlet end of the lowest upwardly inclined drainage pipe 5 is flush with the bottom of the water collection well 10 .

[0016] Furthermore, adjacent water collection wells are connected to form a water collection well structure through the water collection well connecting pipe 8, and the inclination slope of the connecting pipe between the water collection wells is set to 3%-5%; the soil behind the filter layer 7 is the soil body to be protected.

[0017] Furthermore, the upward inclined drainage pipe is filled with an instant noodle-shaped plastic blind ditch.

[0018] Furthermore, the height of the retaining wall is no more than 8m, the bottom width is 0.5-0.7 times the height, and the slopes of the front slope and the back of the wall are set according to actual conditions;

[0019] The spacing of the inclined drainage pipes along the length direction of the retaining wall is 1-2m, and the diameter of the inclined drainage pipes is 0.5-0.8m; the slope of the inclined drainage pipes is set to 2%-10%; the vegetation groove is a triangular column and is set on the slope of the retaining wall.

[0020] Furthermore, the diameter of the gravel filled in the water collection well is larger than the diameter of the inclined drainage pipe and much larger than the diameter of the particles in the back filter layer of the wall.

[0021] Furthermore, the diameter of the gravel-filled water collection well is 0.3-0.5m, the shape is semi-cylindrical, the well height is 50%-70% of the height of the retaining wall, the distance between the top of the gravel-filled water collection well and the top of the retaining wall is greater than 0.5m, the thickness of the water collection well wall is set to 25-35mm, and the diameter of the gravel particles in the well is 100mm-500mm.

[0022] Furthermore, the filter layer includes geotextile; the thickness of the clay layer below the gravel-filled water collection well is 0.5-1m, the thickness of the filter layer is 0.5-0.8m, the bottom of the filter layer is at the same height as the clay layer, and its top is flush with the top surface of the retaining wall.

[0023] Furthermore, the non-uniformity coefficient of the filter layer is set to 2-3, and the mass content of particles smaller than 0.075 mm is 3%-5%.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention is designed to solve the problem that the water in the soil behind the wall cannot be discharged in time and the drainage capacity of the inclined drainage pipe is limited. The water collection well filled with gravel in the retaining wall is directly in contact with the filter layer to more effectively discharge the water in the soil. Without affecting the structural integrity and bulk density of the retaining wall, a number of connected water collection wells are set up to make the water collection wells have a certain water storage capacity to cope with heavy rainfall. While solving the problems of the prior art, the water discharged from the soil is fully utilized, and vines are planted in grooves at the outlet of the inclined drainage pipe, so that the retaining wall is both stable and ecological, realizing the integration of water permeability and anti-slip ecology.

[0026] The current existing technology has poor adaptability to heavy rainfall weather. Under heavy rainfall conditions, the soil behind the wall is prone to instability. The main reason for the instability is that the existing technology is mainly directly connected to the soil behind the wall or the filter layer through an upward inclined drainage pipe. Due to the limited diameter of the upward inclined drainage pipe, it cannot meet its drainage needs during heavy rainfall weather. In response to this problem, the present invention proposes a connected permeable ecological gravity retaining wall, so that the gravel-filled water collection well is in direct contact with the filter layer behind the wall. The soil can be fully drained and the water collection wells are connected. It can adapt well to heavy rainfall weather. The soil behind the wall can be fully drained during heavy rainfall. The connected water collection wells can provide sufficient water collection space. At the same time, a layer of clay anti-seepage is added under the water collection well to ensure that it does not infiltrate into the ground too much and affect the stability of the retaining wall or the soil behind the wall.

[0027] After the water in the soil behind the wall flows into the gravel-filled water collection well, it will reach a certain water level, and the water in the water collection well will be discharged using an upward-inclined drainage pipe. After a groove is cut at the horizontal position of the drainage hole on the slope, the groove is connected to the drainage hole, and rattan plants are planted in the groove. The water discharged from the soil can provide water for the rattan plants, which not only fully utilizes water resources but also achieves the purpose of ecology, making full use of water resources.

[0028] However, the drainage holes in the gravity retaining wall are often blocked by mud and sand in the holes or the water inlet end of the drainage hole is directly blocked by the slope, which makes it impossible to drain water smoothly, resulting in excessive backwater pressure of the wall during heavy rains and failure of support, leading to landslides. The gravity retaining wall uses its own gravity to resist the thrust of landslides, so the drainage structure should minimize the adverse effects on the structural integrity and weight of the retaining wall itself. Therefore, it is not possible to "hollow out" the internal physical structure of the retaining wall in large quantities just to improve the permeability of the retaining wall, thereby destroying the integrity of the retaining wall and reducing the bulk density, causing the retaining wall structure to be vulnerable and weakened in anti-sliding ability. In addition, the durability of vegetation and greening on the surface of the retaining wall is mainly ensured by improving the water supply and water retention capacity of the vegetation, introducing water into the vegetation grooves through the inclined drainage pipes, and utilizing sufficient water sources to improve the durability of the vegetation. If the water collection well structure is a non-connected water collection well, when some of the inclined drainage pipes are blocked, some wells will not only be unable to drain water in time, but will also cause insufficient water sources for some vegetation. In the long run, the vegetation will be seriously affected. If it is a connected water collection well, it can not only increase sufficient water collection space, but also when there is a blockage in the inclined drainage pipe, it can also drain water normally, thereby ensuring the durability of the vegetation and greening, and achieving a steady flow of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an embodiment of a gravity-type permeable ecological retaining wall with a wall-back water collection well connected according to the present invention.

[0030] Figure 2 The diagram is a top plan view of the structure of a gravity-type permeable ecological retaining wall with a connected back-wall water collection well according to the present invention.

[0031] Figure 3 The AA cross-sectional structure diagram of a gravity-type permeable ecological retaining wall with a connected wall-back water collection well according to the present invention.

[0032] Figure 4 The BB cross-sectional structure diagram of a gravity-type permeable ecological retaining wall with a connected wall-back water collection well according to the present invention.

[0033] Figure 5 It is a CC cross-sectional structural schematic diagram of a gravity-type permeable ecological retaining wall with a connected wall-back water collection well according to the present invention.

[0034] Reference numerals:

[0035] 1-drainage hole; 2-vine plants; 3-drainage ditch at the foot of the wall; 4-vegetation grooves; 5-upward inclined drainage pipe; 6-clay layer; 7-filter layer; 8-connecting pipe between water collection wells; 9-main body of the retaining wall; 10-water collection well. DETAILED DESCRIPTION

[0036] The present invention is further explained below in conjunction with the embodiments and drawings, but this is not intended to limit the scope of protection of the present application.

[0037] Under heavy rainfall or continuous rainy weather conditions, slopes often fail. In actual engineering, retaining walls are often used to prevent disasters and take precautions. In actual engineering, gravity retaining walls are widely used due to their structural stability and other characteristics. Most existing technologies directly bury pipes in the retaining wall and connect them directly to the soil, which often encounters many problems, such as: pipe blockage, small drainage volume, inability to adapt to heavy rainfall conditions, etc., which results in the retaining wall failing to fully play its role.

[0038] The main problem in the existing technology that currently cannot take into account both smooth drainage and good structural integrity is the problem of insufficient drainage or blockage of the inclined drainage pipe. If the retaining wall needs to meet extreme rainfall conditions, the water collection well needs to have enough water collection space. This problem is mainly solved by changing the diameter of the water collection well, but the choice of the water collection well diameter will affect the integrity of the retaining wall structure and weaken the bulk density of the retaining wall. In addition, since the gravity retaining wall uses its own gravity to maintain stability, this requires the water collection well to obtain the maximum drainage volume without affecting its bulk density. Most of the existing water collection wells are independently set. When the inclined drainage pipe is blocked, the accumulated water in the water collection well cannot be discharged. While failing to meet the requirements for smooth drainage, it will generate a large hydrostatic pressure, thereby affecting the stability of the entire retaining wall. In addition, the main reason for the current problem of vegetation durability is the lack of water. The blockage of the inclined drainage pipe causes poor drainage, which is the most direct cause of water shortage.

[0039] The gravel-filled water collection well of the present invention is in direct contact with the soil, and the upward inclined drainage pipe 5 is connected to the gravel-filled water collection well 10. In order to prevent soil erosion or blockage of the upward inclined drainage pipe, the water collection well is in contact with the filter layer 7 on the back of the wall. The soil behind the filter layer 7 is to be protected, and the upward inclined drainage pipe is prevented from directly contacting the soil (that is, in the previous technology, the filter layer needs to be connected to the water collection well by an upward inclined drainage pipe. The present invention directly contacts the water collection well with the filter layer, and the water in the filter layer will flow into the water collection well, and then the water is discharged through the upward inclined drainage pipe). The problem of blockage of the upward inclined drainage pipe is alleviated to a certain extent. At the same time, a plastic blind ditch of the instant noodle type (not shown in the figure) is set in the upward inclined drainage pipe 5, which greatly solves the problem of its easy blockage. Because there is a water collection well connecting pipe 8 between the water collection wells filled with gravel, several water collection wells are connected together, and have a strong water storage capacity, which effectively solves the problem of small drainage volume of the upward inclined drainage pipe or inability to adapt to heavy rainfall weather. At the same time, a layer of clay layer 6 is pre-placed under the water collection well for anti-seepage, which can prevent excessive water in the water collection well from leaking downward and affecting the stability of the retaining wall.

[0040] Example 1

[0041] The gravity-type permeable ecological retaining wall with connected water collection wells on the back of the wall in this embodiment includes a retaining wall body 9 and a back wall arranged behind the retaining wall body. The back wall is provided with a filter layer 7 as a whole, and the soil behind the filter layer 7 is the soil body to be protected.

[0042] Define the side where the soil is as the back, and the side where the retaining wall is as the front.

[0043] A number of gravel-filled water collection wells 10 are arranged in the front side of the filter layer 7 along the length direction of the retaining wall. The water collection well is a semi-cylindrical structure with one side having a rectangular cross section, which is closely attached to the wall surface of the filter layer. A plurality of mounting holes for connecting the upward inclined drainage pipe 5 are arranged in the height direction at the front end of the water collection well. Adjacent gravel-filled water collection wells 10 are connected by an inter-water collection well connecting pipe 8.

[0044] A clay layer 6 is provided below the gravel-filled water collection well, and the bottom of the clay layer is flush with the bottom of the back-wall filter layer 7;

[0045] A plurality of rows of vegetation grooves are arranged on the front inclined surface of the retaining wall body, and a plurality of drainage holes are arranged on the side walls of the vegetation grooves, each drainage hole is connected to the water outlet end of an upward inclined drainage pipe 5, and the water inlet end of the upward inclined drainage pipe 5 is connected to the installation hole at the front end of the water collection well correspondingly;

[0046] The water outlet end of the upwardly inclined drainage pipe 5 is lower than the water inlet end, and the water outlet end is connected to the vegetation groove 4 on the front inclined surface, and the vegetation groove 4 is planted with vine plants 2.

[0047] Example 2

[0048] In this embodiment, a corner drainage ditch 3 is arranged at the bottom of the front slope of the retaining wall soil body, and a number of inclined drainage pipes 5 for discharging water from the gravel-filled water collection well 10 are pre-buried in the retaining wall soil body 9. The inclined drainage pipes 5 are arranged along the length and height direction of the wall body, and the water inlet end of the lowest inclined drainage pipe 5 is flush with the bottom of the gravel-filled water collection well 10, and each drainage hole is connected with an inclined drainage pipe 5; the water outlet end of the inclined drainage pipe is placed at the drainage hole 1, the water outlet end of the inclined drainage pipe 5 is lower than the water inlet end, and the water outlet end is connected with the vegetation groove 4, in which vine plants 2 are planted, and excess water flows out along the corner drainage ditch 3.

[0049] In this embodiment, the height of the retaining wall does not exceed 8m, and the bottom width (the distance from the bottom end of the front slope to the filter layer) is 0.5-0.7 times the height of the retaining wall. The slope of the retaining wall slope (front slope) and the back of the wall are set according to actual conditions.

[0050] The spacing of the upward inclined drainage pipes along the length direction of the retaining wall is 1-2m, the diameter of the upward inclined drainage pipes is 50-80mm, and the outlet end of the upward inclined drainage pipes is located at the drainage hole, so the spacing of the drainage holes should be consistent with the spacing of the upward inclined drainage pipes. The slope of the upward inclined drainage pipes is set to 2%-10%, the diameter of the drainage holes is 50-80mm, and the drainage holes are set on the side walls of the vegetation grooves along the length direction of the retaining wall. The vegetation grooves are triangular prisms and are set on the slope of the retaining wall. In the present invention, the number of upward inclined drainage pipes along the height direction of the retaining wall is reasonably set according to the wall height and the well height, and the length of the upward inclined drainage pipes is set according to the actual wall width.

[0051] The diameter of the gravel filled in the water collection well is larger than the diameter of the inclined drainage pipe and much larger than the diameter of the particles in the filter layer. The diameter of the water collection well filled with gravel is 0.3-0.5m, the shape is semi-cylindrical, the well height is 50%-70% of the height of the retaining wall, the distance between the top of the water collection well filled with gravel and the top of the retaining wall is greater than 0.5m, the bottom of the well is 0.5m higher than the lowest drainage hole, the wall thickness of the water collection well is set to 30mm, which can resist the wall stress, and the diameter of the particles in the well is 100-300mm.

[0052] The thickness of the clay layer 6 below the gravel-filled water collection well is 0.5-1m, the thickness of the filter layer is 0.5-0.8m, the bottom of the filter layer is at the same height as the clay layer, and its top is flush with the top surface of the retaining wall. The non-uniformity coefficient of the filter layer is set to 2-3, and the mass content of gravel particles less than 0.075mm is 3%-5%.

[0053] Example 3

[0054] In this embodiment, the filter layer includes a geotextile, which is applied to the side where the wall back is connected to the retaining wall body, and the maximum diameter longitudinal section of the water collection well is in close contact with the filter layer on the wall back, that is, in close contact with the geotextile. Two rows of upward inclined drainage pipes are arranged along the height direction of the water collection well.

[0055] The present invention sets a plurality of connected water collection wells, which not only solves the problem of retaining wall failure caused by blockage of the inclined drainage pipes in the retaining wall, but also reduces the influence of water accumulation in the water collection wells on the bulk density of the wall while facilitating drainage. When a water collection well is opened in a gravity retaining wall, it is necessary to reasonably control the diameter of the water collection well, which not only meets the demand for drainage capacity, but also avoids the well diameter being too large to weaken the structural integrity, and takes into account the requirements of smooth drainage and good structural integrity of the retaining wall. Filling a clay anti-seepage layer at the bottom of the gravel-filled water collection well can prevent water penetration from affecting the stability and bulk density of the wall. After meeting the requirements of the retaining wall for smooth drainage, good structural integrity and large bulk density, the present invention carves a triangular prism-shaped vegetation groove on the slope of the retaining wall, and the vegetation is arranged on the horizontal plane of the groove, and a drainage hole 1 is arranged on the lateral slope. The inclined drainage pipe provides sufficient water to the plants in the vegetation groove through the drainage hole to ensure the durability of the wall vegetation.

[0056] Example 4

[0057] This embodiment provides two types of gravity retaining walls with different built-in drainage systems, thereby demonstrating the rationality of the present invention.

[0058] The first retaining wall is the present invention Figure 1 The retaining wall shown in the figure uses a semi-cylindrical connected drainage well so that its rectangular cross-section is in direct contact with the filter layer; the second retaining wall uses an internal cylindrical gravel-filled water collection well, and an upward inclined drainage pipe is used to connect the filter layer and the gravel-filled water collection well. Except for the shape and contact relationship, the water collection wells of the two retaining walls are consistent in other elements.

[0059] Through numerical calculation, it is found that the drainage speed of the first retaining wall is at least 25% higher than that of the second retaining wall, and the drainage capacity of the first retaining wall is at least 100% higher than that of the second. Therefore, the first retaining wall has a better drainage capacity, which makes the backwater pressure behind the wall relatively small. Because the gravity retaining wall relies on its own gravity to maintain the stability of the soil behind the wall, the volume of the retaining wall can be appropriately reduced when using the first retaining wall. Considering the drainage capacity, drainage speed and other factors, the volume of the retaining wall can be reduced by at least 10% while ensuring the stability of the wall under the premise of the same drainage effect. The reduction in the volume of the retaining wall means that the deadweight is reduced, and the pressure applied to the foundation is also reduced accordingly, which helps to reduce the compression deformation of the foundation soil and reduce the possibility of uneven settlement, thereby avoiding the problems of cracking and tilting of the retaining wall structure caused by foundation settlement, and ensuring the integrity of the structure. If the two water collection wells have the same drainage capacity, the diameter of the water collection well of the retaining wall of the present invention can be reduced by at least 30%, thereby reducing the engineering cost while maintaining the stability of the soil behind the wall.

[0060] Therefore, the present invention has a larger drainage area while reducing the impact on the bulk density of the retaining wall, taking into account the coordinated and unified requirements of large bulk density and smooth drainage.

[0061] Example 5

[0062] In this embodiment, the connecting pipes between the water collection wells are set with a slope of 3%-5%, and the water flow problem after the connection is taken into consideration during the setting, providing sufficient circulation space and appropriate flow speed for the water, and providing potential energy by setting a reasonable slope, thereby promoting flow.

[0063] The slope is the slope of the pipeline, which is the percentage of the vertical height change of the pipeline to the horizontal length change. Multiple water collection wells can be set up in adjacent groups, with 3-5 water collection wells in each group. The water collection wells in the group are centered on the central water collection well, and the water collection well connecting pipes of other water collection wells are inclined toward the central water collection well. Different groups can be connected with different slopes, and the water flow is driven according to the gravitational potential energy.

[0064] The present invention sets a water collection well in the retaining wall body. When setting the water collection well, the influence on the structural integrity and bulk density is fully considered. A semi-cylindrical well is adopted. No wall is set between the well and the filter layer, which further reduces the influence on the structural integrity and bulk density and increases the contact area between the water collection well and the filter layer. The diameter of the water collection well set in this patent is 0.3-0.5m, which fully considers the drainage strength and the stability of the retaining wall itself. The water collection well is in direct contact with the filter layer, so that the water in the soil behind the retaining wall is fully discharged into the water collection well, and the adjacent water collection wells are connected. The interconnected water collection wells can provide sufficient water collection space, effectively reducing the soil pressure behind the wall. In the case of heavy rainfall, the interconnected water collection wells can provide sufficient water collection space to ensure the stability of the retaining wall. While ensuring the stability of the retaining wall, the water resources of the upward inclined drainage pipe are fully utilized, and the vegetation groove is connected at the outlet end of the upward inclined drainage pipe to plant vines to achieve the purpose of ecology and realize the integration of water permeability, anti-slip and ecology. The present invention focuses on the design of unimpeded drainage, good structural integrity, large capacity and good durability of wall vegetation, and the arrangement of the drainage system in the retaining wall is more reasonable.

[0065] The water collection well in the retaining wall of the present invention is a gravel-filled water collection well, which can have a certain high water level and can effectively cope with heavy rainfall weather. The connected gravel-filled water collection wells can provide sufficient water collection space, and the soil behind the wall can be fully drained during heavy rainfall weather to ensure its stability.

[0066] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0067] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0068] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A gravity-type permeable ecological retaining wall with a wall-back water collection well connected, comprising a retaining wall body and a wall back arranged behind the retaining wall body, characterized in that: The back of the wall is provided with an inverted filter layer as a whole, and a number of crushed stone filled water collection wells are provided in front of the inverted filter layer 7 along the length direction of the retaining wall. The water collection well is a semi-cylindrical structure, one side of which is a rectangular cross section, and the rectangular cross section is closely attached to the wall surface of the inverted filter layer. A plurality of mounting holes for connecting the upward inclined drainage pipe are provided in the front end of the water collection well along the height direction; adjacent crushed stone filled water collection wells are connected by connecting pipes between water collection wells; A clay layer is provided under each gravel-filled water collection well, and the bottom of the clay layer is flush with the bottom of the back-wall filter layer; A plurality of rows of vegetation grooves are arranged on the front inclined surface of the retaining wall body, and a plurality of drainage holes are arranged on the side walls of the vegetation grooves. Each drainage hole is connected to the water outlet end of an upward inclined drainage pipe, and the water inlet end of the upward inclined drainage pipe is correspondingly connected to the mounting hole at the front end of the water collection well; the water outlet end of the upward inclined drainage pipe is lower than the water inlet end, and the water outlet end is connected to the vegetation grooves on the front inclined surface, and vine plants are planted in the vegetation grooves.

2. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 1 is characterized in that: The water inlet end of the downwardly inclined drainage pipe in the lowest row is flush with the bottom of the water collection well.

3. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 1 is characterized in that: Adjacent water collection wells are connected by connecting pipes between the water collection wells to form a through water collection well structure, and the inclination slope of the connecting pipes between the water collection wells is set to 3%-5%; the soil to be protected is behind the filter layer.

4. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 1 is characterized in that: The upward inclined drainage pipe is filled with an instant noodle-shaped plastic blind ditch.

5. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 1 is characterized in that: The height of the retaining wall shall not exceed 8m, the bottom width shall be 0.5-0.7 times of the height, and the slope of the front slope and the back of the wall shall be set according to the actual situation; The spacing of the inclined drainage pipes along the length direction of the retaining wall is 1-2m, and the diameter of the inclined drainage pipes is 50-80mm; the slope of the inclined drainage pipes is set to 2%-10%; the vegetation groove is a triangular column and is set on the slope of the retaining wall.

6. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 1 is characterized in that: The diameter of the gravel filled in the water collection well is larger than the diameter of the inclined drainage pipe and much larger than the diameter of the particles in the back filter layer of the wall.

7. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 6 is characterized in that: The diameter of the gravel-filled water collection well is 0.3-0.5m, the shape is semi-cylindrical, the well height is 50%-70% of the height of the retaining wall, the distance between the top of the gravel-filled water collection well and the top of the retaining wall is greater than 0.5m, the thickness of the water collection well wall is set to 25-35mm, and the diameter of the gravel particles in the well is 100-300mm.

8. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 1 is characterized in that: The filter layer includes geotextile; the clay layer below the gravel-filled water collection well is 0.5-1m thick, the filter layer is 0.5-0.8m thick, the bottom of the filter layer is at the same height as the clay layer, and its top is flush with the top surface of the retaining wall.

9. The gravity-type permeable ecological retaining wall with connected water collection wells behind the wall according to claim 8 is characterized in that: The non-uniformity coefficient of the filter layer is set to 2-3, and the mass content of particles smaller than 0.075 mm is 3%-5%.

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