CN220888688U - Step loess cutting slope surface drainage protection structure - Google Patents

Abstract

The utility model belongs to the technical field of geotechnical engineering, and discloses a stepped loess cutting slope surface drainage protection structure, which comprises: the slope surface rainwater energy dissipation structure is arranged between the slope top and the ground surface below the slope body, is arranged on the loess slope surface, is arranged at the junction of each grade of slope surface and the reverse inclination step, and can be arranged according to the actual slope conditions. The utility model solves the problems of high protective cost of loess cut slope surface, heavy weight of concrete and other structures and easy cracking in the prior art, and also gives attention to environmental protection and improves the aesthetic property of the slope.

Description

Step loess cutting slope surface drainage protection structure

Technical Field

The utility model belongs to the technical field of geotechnical engineering, and particularly relates to a stepped loess cutting slope surface drainage protection structure.

Background

At present, along with the continuous deep construction of urban and highway, railway and other road engineering, a large number of high-steep excavation slopes are formed in northwest loess areas of China. The excavated slope surface can be gradually eroded into the ditches with different sizes and depths under the long-term rainfall effect, so that the stability of the slope is reduced on one hand, and the attractiveness of the slope is reduced on the other hand. At present, the loess slope is protected by adopting a traditional slope protection structure such as a grout stone and a concrete lattice, but the structure has higher manufacturing cost, large self weight and easy cracking, and rainwater can infiltrate into the slope along structural cracks and continuously wash out soil under the action of rainfall, so that the protection effect is greatly reduced. Moreover, after the slope protection structures such as the grout rubble and the concrete lattice are applied to the slope cutting surface, vegetation is difficult to plant on the slope surface, so that the protection effect of the protection structure is weakened, and the attractiveness of the slope is reduced. The patent with the application number 201220197009.2 discloses a natural drainage system of a slope step, but the slope, the step and the groove do not adopt erosion and scouring prevention measures, and slope water flow can gradually damage the step and the groove under the action of long-term rainfall to lose the drainage function, and the erosion of the slope by rainwater can form a plurality of nearly parallel erosion grooves, so that the stability and the attractiveness of the slope are greatly reduced. The drainage system is not applicable to the protection of high and steep cut slopes in loess areas. In view of this, there is an urgent need for a loess cutting slope surface drainage protection structure having advantages such as low in manufacturing cost, green, protection effect is durable, can be widely used in the protection of the stair-shaped loess cutting slope surface in loess regions in the north of shan.

Through the above analysis, the problems and defects existing in the prior art are as follows:

The loess cutting slope surface protection structure in the prior art is high in manufacturing cost, heavy in self weight and easy to crack, and most of the loess cutting slope surface protection structures such as grout stones and concrete lattices are used for the slope surface, so that vegetation is difficult to plant, the protection effect of the protection structure is weakened, and the attractiveness of the slope is reduced.

Disclosure of utility model

Aiming at the problems existing in the prior art, the utility model provides a stepped loess cutting slope surface drainage protection structure.

The utility model is realized in this way, a ladder loess cutting slope surface drainage protection structure, the ladder loess cutting slope surface drainage protection structure includes: the slope surface rainwater energy dissipation structure is arranged between the slope top and the ground surface below the slope body, is arranged on the loess slope surface, is arranged at the junction of each grade of slope surface and the reverse inclination step, and can be arranged according to the actual slope conditions.

Further, the anti-clogging drain tank includes: anchoring geotextiles, geomembranes, clay, pebbles and geomembrane ends; the geomembrane covers the surface of the soil body excavated by the drainage tank, the clay covers the surface of the geomembrane, the sand pebbles are filled in the geomembrane covered with the clay, the geotextile covers the sand pebbles, and the tail end anchor of the geomembrane is connected with the geomembrane and anchored in the reverse-tilting step.

Further, the domatic rainwater energy dissipation structure includes: the system comprises geotechnical anchor rods, geotechnical grids, geotechnical belts, three-dimensional nets and three-dimensional geotechnical filter screens; the three-dimensional geotechnical filter screen, the three-dimensional net and the geotechnical belt are sequentially arranged from the slope surface outwards, the three-dimensional geotechnical filter screen, the three-dimensional net and the geotechnical belt are tightly wrapped through the geogrid, and the geotechnical anchor rod anchors the tightly wrapped geotechnical belt, the three-dimensional net and the three-dimensional geotechnical filter screen on the slope surface.

Further, the geotextile is woven by the environment-friendly geosynthetic material and has a pore structure, so that rainwater can infiltrate to prevent coarse soil particles from entering the sand pebbles in the drainage tank.

Further, the geomembrane is made of an environment-friendly geosynthetic material and has a thickness of 2-5 mm.

Further, the sand in the sandy pebbles is clean natural sand with the particle size of 1-5mm, and the pebbles are clean cobbles with the particle size of 10-60 mm.

Further, the length of the anchoring of the tail end of the geomembrane is not less than 10cm, and the geomembrane is used for preventing the geomembrane from excessively shrinking and deforming in the construction and later drainage processes.

Further, the geotechnical anchor rod is made of environment-friendly geotechnical synthetic materials, the length of the anchor rod is not less than 30cm, and the diameter of the anchor head is not less than 10cm.

Further, the geogrid is made of geosynthetic material, and the aperture of the grid is not more than 4cm.

Further, the geotechnical belt is made of geosynthetic material, the rigidity is not less than 600kN/m, and the thickness is 1-3cm; soil and plant seeds can be filled in the three-dimensional net; the three-dimensional geotechnical filter screen is made of geosynthetic materials and has a honeycomb structure.

First, the utility model solves the problems of high protective cost, heavy self weight and easy cracking of loess cutting slope surface in the prior art, and also gives attention to green and environmental protection, and improves the aesthetic property of the slope.

The materials used in the utility model are all environment-friendly geosynthetic materials, and have the advantages of no pollution, low cost, small weight and the like.

The arrangement of the reverse-tilting steps can effectively collect slope rainwater and guide the water flow into the drainage groove rapidly and efficiently, and can reduce the flow of the rainwater on the next-stage slope, reduce the flushing of the steps and the slope by the rainwater and enhance the slope stability.

The geotextile for preventing the drainage channel from being blocked can effectively prevent the slope soil particles washed away by rainwater from accumulating and blocking the drainage channel, so that the service life of the drainage channel is greatly prolonged; the geomembrane can prevent rainwater from penetrating into the slope body, so that the stability of the slope body is greatly improved; the sand and pebbles with different particle sizes in the drainage tank can drain accumulated water rapidly, so that water flow collection is reduced.

In the utility model, the geotechnical belt, the three-dimensional net and the three-dimensional geotechnical filter screen in the slope surface rainwater energy dissipation structure are tightly wrapped into a whole by the geogrid and are firmly anchored on the slope surface by the geotechnical anchor rod, so that the overall stability of the structure and the slope surface is greatly enhanced.

The three-dimensional net in the slope surface rainwater energy dissipation structure is filled with soil and plant seeds, so that on one hand, the rainwater scouring effect can be weakened, and on the other hand, the slope surface greening effect can be achieved.

The three-dimensional geotechnical filter screen in the slope rainwater energy dissipation structure is of a honeycomb structure, so that the slope rainwater scouring energy can be greatly reduced, and larger soil particles can be prevented from impacting the slope to a certain extent.

Secondly, the utility model provides a remarkable technical improvement for obtaining the step loess cutting slope surface drainage protection structure:

1. Drainage efficiency is improved: this step loess cuts domatic drainage protective structure of slope can more quick, more effectively drain, has reduced the residence time of rainwater on domatic, has reduced weak erosion to domatic, has improved drainage efficiency.

2. The stability of the slope body is improved: the structure can effectively prevent rainwater from penetrating into the slope body, reduce the pore water pressure in the slope body, improve the stability of the slope body and avoid the occurrence of disasters such as landslide, collapse and the like.

3. The environmental protection capability is improved: the structure adopts the environment-friendly geosynthetic material, can reduce the pollution to the environment, and simultaneously, the three-dimensional net is internally filled with soil and plant seeds, so that the aesthetic property of the side slope can be enhanced after the plants are ripe.

4. Construction efficiency is improved: the structure adopts the geomembrane terminal anchoring technology, can rapidly and accurately finish construction, improves the construction efficiency, and reduces the construction cost.

5. Improving slope restoration capacity: if the slope is damaged, the structure can be quickly and accurately repaired, the repair time and cost are reduced, and the slope repair capability is improved.

Drawings

Fig. 1 is a sectional view of a drainage protection structure for a stepped loess cutting slope surface according to an embodiment of the present utility model.

Fig. 2 is a front view of a drainage protection structure for a stepped loess cutting slope surface according to an embodiment of the present utility model.

Fig. 3 is a schematic view of an anti-blocking drain tank according to an embodiment of the present utility model.

Fig. 4 is a schematic diagram of a slope rainwater energy dissipation structure provided by an embodiment of the utility model.

In the figure: 1. a slope body; 2. a slope roof; 3. a reverse tilting step; 4. slope rainwater energy dissipation structure; 41. geotechnical anchor rods; 42. geogrid; 43. a geotechnical belt; 44. a three-dimensional net; 45. a three-dimensional geotechnical filter screen; 5. anti-blocking drainage channel; 51. geotextile; 52. geomembrane; 53. clay; 54. sand pebbles; 55. anchoring the tail end of the geomembrane; 6. a slope; 7. a surface.

Description of the embodiments

The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 and 2, the stepped loess cutting slope surface drainage protection structure includes: the structure is arranged between a slope top 2 and a ground surface 7 below a slope body, the slope surface rainwater energy dissipation structure 4 is arranged on a loess cutting slope surface 6, and one, two or even multiple rows of slope surface rainwater energy dissipation structures 4 can be arranged on the slope surface 6; for convenience of explanation, this embodiment adopts a setting mode that a slope sets up two rows of slope rainwater energy dissipation structures 4, prevents blocking water drainage tank 5 and sets up in each level slope 6 and the junction of step 3 that leans against, and the width and the angle of leaning against of step 3 can set up according to actual side slope condition.

As shown in fig. 3, the structure of the anti-clogging drain tank 5 includes: geotextile 51, geomembrane 52, clay 53, pebbles 54, and geomembrane end anchors 55; the geomembrane 52 covers the surface of the soil body excavated by the drainage tank, the clay 53 covers the surface of the geomembrane 52, the sand pebbles 54 are filled in the geomembrane 52 covered with the clay 53, the geotextile 51 covers the sand pebbles 54, and the geomembrane tail end anchors 55 are connected with the geomembrane 52 and anchored in the reverse-tilting step 3.

Geotextile 51 is woven from an environmentally friendly geosynthetic material and has a porous structure that covers drainage channel sand pebbles 54 to allow rain water to penetrate therethrough and block coarse soil particles from entering drainage channel sand pebbles 54. The geomembrane 52 is made of an environment-friendly geosynthetic material, has a certain thickness (2-5 mm), is covered on the surface of the excavated soil body of the drainage tank, can prevent rainwater from penetrating into the slope body 1, and can prevent the sand pebbles 54 from piercing the geomembrane 52 by covering a layer of clay 53 on the surface of the geomembrane 52. The sand in the pebble 54 is clean natural sand with the particle size of 1-5mm, and the pebble is clean cobble with the particle size of 10-60 mm. The geomembrane end anchors 55 are not less than 10cm in length to prevent excessive shrinkage deformation of the geomembrane 52 during construction and later drainage.

As shown in fig. 4, the slope rainwater energy dissipating structure 4 includes: a geotechnical anchor rod 41, a geotechnical grille 42, a geotechnical belt 43, a three-dimensional net 44 and a three-dimensional geotechnical filter screen 45; the three-dimensional geotechnical filter screen 45, the three-dimensional net 44 and the geotechnical belt 43 are sequentially arranged outwards from the slope surface 6, the three-dimensional geotechnical filter screen 45, the three-dimensional net 44 and the geotechnical belt 43 are tightly packed through the geogrid 42, and the geotechnical anchor rod 41 anchors the geotechnical belt 43, the three-dimensional net 44 and the three-dimensional geotechnical filter screen 45 which are tightly packed on the slope surface.

The geotechnical anchor rod 41 is made of environment-friendly geotechnical synthetic materials, the length of the anchor rod is not less than 30cm, the diameter of the anchor head is not less than 10cm, and the geotechnical anchor rod is used for firmly anchoring the geotechnical belt 43, the three-dimensional net 44 and the three-dimensional geotechnical filter screen 45 on the slope surface 6. The geogrid 42 is made of geosynthetic material, and has a mesh aperture of not more than 4cm, and is used for wrapping the geotechnical belt 43, the three-dimensional net 44 and the three-dimensional geotechnical filter screen 45, so that the three are in closer contact. The geotechnical belt 43 is a geosynthetic material having a stiffness of not less than 600kN/m and a thickness of 1-3cm. The three-dimensional net 44 is interposed between the geotechnical belt 43 and the three-dimensional geotechnical filter screen 45, and the inside thereof can be filled with soil and plant seeds, so that on one hand, the rainwater scouring effect can be weakened, and on the other hand, the effect of greening the slope can be achieved. The three-dimensional geotechnical filter screen 45 is a honeycomb structure made of geosynthetic materials, and can greatly reduce the rain wash energy of the slope.

The working principle of the step loess cutting slope surface drainage protection structure is as follows:

When rainfall occurs, the rainwater flows into the anti-blocking drainage groove 5 through the slope rainwater energy dissipation structure 4 on the slope 6. Because of the pore structure of the geotextile 51, finer particles can pass through the geotextile 51 into the drainage channel while larger particles are blocked at the surface of the geotextile 51. Then, the rainwater continues to flow into the sandy pebble 54 part of the drainage tank, and coarse particles in the water are further removed due to the filtering action of the sand and pebbles in the sandy pebble 54.

The geomembrane 52 covers the soil surface of the drainage channel to prevent rainwater from penetrating into the slope 1. Meanwhile, the clay 53 covers the surface of the geomembrane 52, so that the sand and pebbles 54 can be prevented from piercing the geomembrane 52.

The geomembrane end anchors 55 are not shorter than 10cm in length, and can prevent the geomembrane 52 from excessively shrinking and deforming during construction and later drainage.

Through this step loess cutting slope surface drainage protective structure, can collect and discharge slope surface rainwater effectively, prevent simultaneously that the slope body from receiving strong erosion and the destruction of rainwater.

The following are two specific embodiments and corresponding implementation schemes:

Examples

Two rows of slope surface rainwater energy dissipation structures 4 are arranged on the slope surface 6 and comprise a first slope surface rainwater energy dissipation structure 4a and a second slope surface rainwater energy dissipation structure 4b. The first slope rainwater energy dissipation structure 4a is arranged at a position closer to the slope roof 2, and the second slope rainwater energy dissipation structure 4b is arranged at a position farther from the slope roof 2.

Digging a drainage ditch at the junction of the slope surface 6 and the reverse-tilting step 3 to serve as a rainwater collecting groove for the rainwater flowing through the first slope surface rainwater energy dissipation structure 4a and the second slope surface rainwater energy dissipation structure 4 b. The width and the depth of the drainage ditch are set according to actual needs.

Corresponding drainage materials such as broken stone, pebble, sand and the like are paved in the drainage ditch, so that rainwater can smoothly flow into the drainage ditch.

Ensure that the outlets on the two sides of the drainage ditch are not blocked by objects so as to ensure smooth drainage.

Examples

Geomembrane end anchors 55 are provided within the reverse incline step 3.

An anchor ditch with proper depth and width is dug in the reverse tilting step 3, and the length is the same as the length of the reverse tilting step 3.

The geomembrane end anchors 55 are placed into the anchoring grooves and filled with an appropriate amount of anchoring material, such as cement mortar, concrete, etc., so that the geomembrane end anchors 55 are firmly anchored with the soil in the reverse-leaning step 3.

A layer of protective material, such as geotextile, plastic film, etc., is laid on the surface of the geomembrane end anchors 55 to prevent damage to the geomembrane end anchors 55 by the anchor material.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the utility model is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present utility model will be apparent to those skilled in the art within the scope of the present utility model.

Claims (10)

1. The utility model provides a step loess cuts slope surface drainage protective structure which characterized in that includes: the device comprises a reverse-tilting step, a slope rainwater energy dissipation structure and an anti-blocking drainage tank;

the protective structure is arranged between the slope top and the ground surface below the slope body;

The slope surface rainwater energy dissipation structure is arranged on the loess cutting slope surface, the anti-blocking drainage groove is arranged at the junction of each grade of slope surface and the reverse inclination step, and the width and the reverse inclination angle of the reverse inclination step can be set according to the actual slope condition.

2. The stepped loess cutting slope surface drainage protection structure as set forth in claim 1, wherein the structure of the anti-blocking drainage groove comprises: anchoring geotextiles, geomembranes, clay, pebbles and geomembrane ends; the geomembrane covers the surface of the soil body excavated by the drainage tank, the clay covers the surface of the geomembrane, the sand pebbles are filled in the geomembrane covered with the clay, the geotextile covers the sand pebbles, and the tail end anchor of the geomembrane is connected with the geomembrane and anchored in the reverse-tilting step.

3. The stepped loess cutting slope surface drainage protection structure as set forth in claim 1, wherein the slope surface rainwater energy dissipation structure comprises: the system comprises geotechnical anchor rods, geotechnical grids, geotechnical belts, three-dimensional nets and three-dimensional geotechnical filter screens; the three-dimensional geotechnical filter screen, the three-dimensional net and the geotechnical belt are sequentially arranged from the slope surface outwards, the three-dimensional geotechnical filter screen, the three-dimensional net and the geotechnical belt are tightly wrapped through the geogrid, and the geotechnical anchor rod anchors the tightly wrapped geotechnical belt, the three-dimensional net and the three-dimensional geotechnical filter screen on the slope surface.

4. The stepped loess cutting slope surface drainage protective structure as set forth in claim 2, wherein the geotextile is woven from an environment-friendly geosynthetic material and has a pore structure for allowing rainwater to infiltrate and blocking coarse particles of soil from entering the sand and pebbles inside the drainage tank.

5. The stepped loess cutting slope surface drainage protective structure as set forth in claim 2, wherein the geomembrane is made of an environment-friendly geosynthetic material having a thickness of 2-5 mm.

6. The stepped loess cutting slope surface drainage protective structure as set forth in claim 2, wherein the sand in the sandy pebble is clean natural sand having a particle size of 1-5mm and the pebble is clean pebble having a particle size of 10-60 mm.

7. The drainage protection structure for a stepped loess cutting slope surface as set forth in claim 2, wherein the length of the anchor of the end of the geomembrane is not less than 10cm for preventing the geomembrane from excessively shrinking and deforming during construction and later drainage.

8. The water drainage protection structure for the stepped loess cutting slope surface as set forth in claim 3, wherein the geotechnical anchor rod is made of an environment-friendly geosynthetic material, the length of the anchor rod is not less than 30cm, and the diameter of the anchor head is not less than 10cm.

9. The stepped loess cutting slope surface drainage protective structure as set forth in claim 3, wherein the geogrid is a geosynthetic material and has a mesh aperture of not more than 4cm.

10. The water drainage protection structure for a stepped loess cutting slope surface as set forth in claim 3, characterized in that the geotechnical belt is made of geosynthetic material, has rigidity not less than 600kN/m and thickness of 1-3cm; soil and plant seeds can be filled in the three-dimensional net; the three-dimensional geotechnical filter screen is made of geosynthetic materials and has a honeycomb structure.