CN111485566A - Geocell reinforced embankment ecological edge covering structure and construction method thereof - Google Patents

Abstract

The invention discloses an ecological edge-covering structure of a reinforced embankment with a geocell, which comprises a geocell reinforced layer, transverse drain pipes and an embedded soil layer, wherein longitudinal drainage ditches are arranged on two sides of the embankment and in the middle of a roadbed, the geocell reinforced layer is formed by adding permeable concrete into the geocell, the geocell reinforced layer is laid at the bottom layer of the embankment and is laid along the width direction of the embankment, the transverse drain pipes are arranged above the longitudinal drainage ditches on two sides of the embankment, one ends of the transverse drain pipes are embedded in the embankment, permeable geotextile is arranged to prevent embankment soil from blocking the transverse drain pipes, the other ends of the transverse drain pipes extend into the longitudinal drainage ditches, and the embedded soil layer is laid on the slope surface of the embank. The invention has the advantages of high strength, strong water permeability, beautiful appearance, low cost, good water and soil conservation effect and the like, and particularly has good effect on improving the strength of the highway subgrade in soft soil areas.

Description

Geocell reinforced embankment ecological edge covering structure and construction method thereof

Technical Field

The invention relates to the field of road construction, in particular to an ecological edge-covering structure of a geocell reinforced embankment and a construction method thereof.

Background

In the regions with more rainfall or the regions of the riverside in China, the embankment is influenced by the pore water for a long time, the physical and mechanical properties of the embankment soil are changed, the structural strength of the embankment is greatly reduced, and the load bearing and deformation resisting capabilities of the embankment are also greatly reduced. Meanwhile, in areas with large rainfall, the embankment is influenced by slope runoff for a long time, and water flow can scour soil bodies to cause water and soil loss and various embankment diseases. Therefore, how to prevent water and soil loss and ensure that the structural strength of the embankment is not influenced while ensuring smooth drainage of the embankment structure becomes a key problem in the design and construction of road engineering.

Disclosure of Invention

In order to solve the technical problems, the invention provides an ecological edge covering structure of a geocell reinforced embankment, which is simple in structure and high in strength, and a construction method of the ecological edge covering structure.

The technical scheme for solving the problems is as follows: the utility model provides a geotechnique's check room adds muscle embankment ecology structure of borduring, includes geotechnological check room with muscle layer, horizontal drain pipe, plants the soil horizon, and the both sides and the road bed middle part of embankment set up the longitudinal drainage ditch, geotechnological check room adds the muscle layer and adds the concrete that permeates water by geotechnological check room and constitutes, geotechnological check room adds the muscle layer and lays in embankment bottom department and along the embankment width direction of embankment, and the longitudinal drainage ditch top of embankment both sides sets up horizontal drain pipe, and horizontal drain pipe's one end is buried and is planted in the embankment to arrange the geotechnological cloth that permeates water and prevent embankment soil block up horizontal drain pipe, the horizontal drain pipe other.

According to the geocell reinforced embankment ecological edge covering structure, the geocell is a three-dimensional reticular cell structure formed by welding HDPE (high-density polyethylene) sheet materials.

According to the ecological edge covering structure of the geocell reinforced embankment, the pervious concrete is a honeycomb structure formed by coating a thin layer of cement slurry on the surface of coarse aggregate and mutually bonding the thin layer of cement slurry to form holes which are uniformly distributed.

According to the ecological edge covering structure of the geocell reinforced embankment, the transverse drainage pipes are arranged at intervals of 50M.

According to the geocell reinforced embankment ecological edge covering structure, the gradient of the transverse drainage pipe is 4% -6%.

A construction method of an ecological edge-covering structure of a geocell reinforced embankment comprises the following steps:

(1) constructing the embankment, and when the design height of the embankment is greater than or equal to 2m, adopting layered filling, wherein the height of each layer is 1-2 m, and performing layered hydraulic filling until the design height is reached; when the design height of the embankment is less than 2m, performing one-time hydraulic filling to the design height;

(2) longitudinal drainage ditches are arranged on two sides of the embankment;

(3) arranging transverse drainage pipes at the upper parts of the longitudinal drainage ditches on the two sides of the embankment, wherein the gradient of the transverse drainage pipes is 4-6%;

(4) one end of a transverse drain pipe is embedded in the embankment, and is provided with a permeable geotextile to prevent embankment soil from blocking the drain pipe, and the other end of the transverse drain pipe extends into the longitudinal drainage ditch;

(5) laying a geocell reinforcement layer at the bottom layer of the embankment, laying the earthwork lattice reinforcement layer along the width direction of the embankment, wherein the laying width is 70cm, and laying the earthwork lattice reinforcement layer at both sides of the embankment;

(6) leveling and compacting for multiple times by using a bulldozer until the standard requirement is met;

(7) finely leveling by using a land leveler;

(8) rolling by a vibration type road roller according to the sequence of static pressure, weak vibration rolling and strong vibration rolling until the compactness meets the standard requirement;

(9) paving a layer of soil with the thickness of 20cm on the slope surface of the embankment, compacting, and paving grass seeds to finish the construction of the soil planting layer;

(10) after the laying of the planting soil layer is finished, a layer of pervious concrete is laid, and the water permeability of the embankment is ensured while the erosion of surface runoff on the embankment soil is reduced.

The invention has the beneficial effects that:

the invention provides an embankment bottom layer structure which is formed by arranging a geocell reinforced permeable concrete interlayer along the width direction, and a surface layer structure of an embankment edge covering structure which is formed by arranging permeable concrete and a planting layer along the gradient direction. Compared with the traditional geocell reinforced soil structure, the invention has better strength and deformation resistance. The permeable concrete is used as the surface layer of the edge-covering structure of the embankment, so that the edge-covering structure of the embankment can reduce the erosion of surface runoff on embankment soil, and in addition, the embankment can be ensured to have good drainage performance, so that the embankment can be kept to have enough strength to bear upper load and resist deformation in a multi-precipitation area or a humid coastal area. Due to the addition of the planting soil layer, the edge covering structure of the embankment has certain aesthetic property and is an environment-friendly structure. The planting soil layer can also have the function of keeping water and soil, and particularly has good effect on improving the strength of the highway subgrade in a soft soil area. The method is suitable for roads of various levels in areas with more rainfall and coastal areas, and is particularly suitable for various newly built and reconstructed roads in soft soil areas.

Drawings

Fig. 1 is a schematic view of an ecological edge covering structure of the geocell reinforced embankment in the invention.

Fig. 2 is a schematic view of the geocell reinforcement layer of fig. 1.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1 and 2, an ecological edge-covering structure of a geocell reinforced embankment comprises a geocell reinforced layer 1, a transverse drainage pipe 4 and an embedded soil layer 2, wherein longitudinal drainage ditches 7 are arranged on two sides of the embankment 6 and in the middle of a roadbed, the geocell reinforced layer 1 is laid at the bottom of the embankment 6 and is laid along the width direction of the embankment 6, the transverse drainage pipe 4 is arranged at 50M intervals above the longitudinal drainage ditches 7 on two sides of the embankment 6, the gradient of the transverse drainage pipe 4 is 4% -6%, one end of the transverse drainage pipe 4 is embedded in the embankment 6, a permeable geotextile 5 is arranged to prevent the embankment 6 from being blocked by soil, the other end of the transverse drainage pipe 4 extends into the longitudinal drainage ditches 7, and the embedded soil layer 2 is laid on the slope surface of the embank.

The geocell reinforcement layer 1 is a composite structure body which is formed by geocells 8 and pervious concrete 9 and has strong lateral limitation, high lateral limitation and skid resistance are achieved, deformation is prevented, and the bearing capacity and the dispersed load effect of a roadbed are effectively enhanced. The membrane of the geocell 8 is provided with round holes, so the drainage performance of the structure is relatively good.

The geocell 8 is a three-dimensional mesh cell structure formed by welding reinforced HDPE sheets with high strength. Generally by ultrasonic needle welding. Some of them punch holes in the membrane sheet as required by the engineering. According to the invention, the composite structure with strong lateral limitation is formed by the structure of the geocell 8 and the pervious concrete 9, and the drainage of the structure is relatively good because the circular holes are punched on the membrane of the geocell 8.

The pervious concrete 9 is also called porous concrete, and is porous lightweight concrete prepared by mixing aggregate, cement, reinforcing agent and water, and does not contain fine aggregate. The pervious concrete 9 has a cellular structure with uniformly distributed pores formed by coating a thin layer of cement slurry on the surface of coarse aggregate and bonding the thin layer of cement slurry, so that the pervious concrete has the characteristics of air permeability, water permeability and light weight. According to the invention, the pervious concrete 9 and the planting soil layer 2 are used as the pervious embankment 6 edge covering structure, so that water and soil can be effectively kept, and an attractive and environment-friendly embankment 6 edge covering structure can be provided.

The transverse drain pipe 4 is made of sanitary polyvinyl chloride (PVC) resin as a main raw material, a proper amount of stabilizer, lubricant, filler, toner and the like are added, the mixture is subjected to extrusion molding by a plastic extruder and injection molding by an injection molding machine, and the production of pipes and pipe fittings is completed through the working procedures of cooling, solidification, sizing, inspection, packaging and the like.

The geotextile 5 is a water-permeable geosynthetic material formed by needling or weaving synthetic fibers and is arranged at one end of the transverse drain pipe 4, so that the transverse drain pipe 4 is prevented from being blocked by soil while water flow can be discharged along the drain pipe.

The soil planting layer 2 is a layer of embankment 6 soil with the thickness of about 20cm, grass seeds are scattered on the soil planting layer 2 after compaction, and then the grass seeds can grow green plants through the pores of the pervious concrete 9.

A construction method of an ecological edge-covered structure of a geocell 8 reinforced embankment 6 comprises the following steps:

(1) constructing an embankment 6, and when the design height of the embankment 6 is greater than or equal to 2m, adopting layered filling, wherein the height of each layer is 1-2 m, and performing layered hydraulic filling until the design height; when the design height of the embankment 6 is less than 2m, performing one-time hydraulic filling to the design height;

(2) longitudinal drainage ditches 7 are arranged on two sides of the embankment 6;

(3) the upper parts of longitudinal drainage ditches 7 on two sides of the embankment 6 are provided with transverse drainage pipes 4, and the gradient of each transverse drainage pipe 4 is 4-6%;

(4) one end of a transverse drain pipe 4 is embedded in an embankment 6, a permeable geotextile 5 is arranged to prevent the embankment 6 from blocking the drain pipe, and the other end of the transverse drain pipe 4 extends into a longitudinal drain ditch 7;

(5) paving a geocell 8 reinforcement layer 1 at the bottom layer of the embankment 6, paving along the width direction of the embankment 6, wherein the paving width is 70cm, and paving is carried out on both sides of the embankment 6;

(6) leveling and compacting for multiple times by using a bulldozer until the standard requirement is met;

(7) finely leveling by using a land leveler;

(8) rolling by a vibration type road roller according to the sequence of static pressure, weak vibration rolling and strong vibration rolling until the compactness meets the standard requirement;

(9) paving a layer of soil with the thickness of 20cm on the slope of the embankment 6, compacting, and paving grass seeds to finish the construction of the soil planting layer 2;

(10) after finishing the laying of the planting soil layer 2, laying a permeable concrete layer 3, and ensuring the water permeability of the embankment 6 while reducing the erosion of the surface runoff on the embankment 6.

Because this pervious concrete 9 has great porosity, the grass seed can be come out through the pore growth of pervious concrete 9, compare in the structure of borduring before, can keep lower cost, still keep the effect of soil and water and pleasing to the eye environmental protection in addition.

Claims (6)

1. The utility model provides a geotechnique's check room adds ecological structure of borduring of muscle embankment which characterized in that: including geotechnological check room with muscle layer, transverse drainage pipe, planting the soil horizon, the both sides and the road bed middle part of embankment set up the longitudinal drainage ditch, geotechnological check room adds the muscle layer and adds the concrete that permeates water by geotechnological check room and constitute, geotechnological check room adds the muscle layer and lays in embankment bottom department and along the embankment width direction of embankment, and the longitudinal drainage ditch top of embankment both sides sets up transverse drainage pipe, and transverse drainage pipe's one end is buried and is planted in the embankment to arrange the geotechnological cloth that permeates water and prevent embankment soil jam transverse drainage pipe, the transverse drainage pipe other end stretches into the longitudinal drainage ditch, it lays on embank.

2. The geocell reinforced embankment ecological edging structure according to claim 1, characterized in that: the geocell is a three-dimensional mesh cell structure formed by welding HDPE sheets.

3. The geocell reinforced embankment ecological edging structure according to claim 1, characterized in that: the pervious concrete is a honeycomb structure formed by coating a thin layer of cement slurry on the surface of coarse aggregate and mutually bonding to form holes which are uniformly distributed.

4. The geocell reinforced embankment ecological edging structure according to claim 1, characterized in that: the transverse drain pipes are arranged at intervals of 50M.

5. The geocell reinforced embankment ecological edging structure according to claim 1, characterized in that: the gradient of the transverse drainage pipe is 4% -6%.

6. A construction method of the geocell reinforced embankment ecological edging structure according to any one of claims 1 to 5, comprising the following steps:

(1) constructing the embankment, and when the design height of the embankment is greater than or equal to 2m, adopting layered filling, wherein the height of each layer is 1-2 m, and performing layered hydraulic filling until the design height is reached; when the design height of the embankment is less than 2m, performing one-time hydraulic filling to the design height;

(2) longitudinal drainage ditches are arranged on two sides of the embankment;

(3) arranging transverse drainage pipes at the upper parts of the longitudinal drainage ditches on the two sides of the embankment, wherein the gradient of the transverse drainage pipes is 4-6%;

(4) one end of a transverse drain pipe is embedded in the embankment, and is provided with a permeable geotextile to prevent embankment soil from blocking the drain pipe, and the other end of the transverse drain pipe extends into the longitudinal drainage ditch;

(5) laying a geocell reinforcement layer at the bottom layer of the embankment, laying the earthwork lattice reinforcement layer along the width direction of the embankment, wherein the laying width is 70cm, and laying the earthwork lattice reinforcement layer at both sides of the embankment;

(6) leveling and compacting for multiple times by using a bulldozer until the standard requirement is met;

(7) finely leveling by using a land leveler;

(8) rolling by a vibration type road roller according to the sequence of static pressure, weak vibration rolling and strong vibration rolling until the compactness meets the standard requirement;

(9) paving a layer of soil with the thickness of 20cm on the slope surface of the embankment, compacting, and paving grass seeds to finish the construction of the soil planting layer;

(10) after the laying of the planting soil layer is finished, a layer of pervious concrete is laid, and the water permeability of the embankment is ensured while the erosion of surface runoff on the embankment soil is reduced.

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