A method for ecologically filling road embankments with high-strength steel wire mesh reinforced materials

Abstract

A method for ecologically filling a road embankment with high-strength steel wire mesh reinforced materials is to use a high-strength steel wire mesh with a folded angle and an inverted cover surface to lay it at the roadbed filling position; from the bottom layer of the paving, the high-strength steel wire mesh is laid horizontally in sections, and the edges of each section of the high-strength steel wire mesh are twisted and connected; a plant ecological mat is laid along the folded angle of the high-strength steel wire mesh and backfilled with planting soil; soil is filled on the high-strength steel wire mesh, and the layered filling is carried out according to the compaction thickness not exceeding 30 cm; after the filling thickness reaches the designed reinforcement mesh spacing, the inverted cover surface is folded and fixed to the filling compaction surface, and plant strips with roots are inserted; the above operation is repeated to continue filling until it approaches the top of the roadbed; a crushed stone drainage layer is set on the lower high-strength steel wire mesh, and a geotechnical material drainage mat is set, and the geotechnical material drainage mat is connected to the crushed stone drainage layer; finally, grass seeds are planted on the outer slope of the plant ecological mat. This filling method can be used for steeper roadbed fill slopes, and has the characteristics of stable filled roadbed structure and good landscaping effect of roadbed slopes.

Description

Technical Field

[0001] The invention relates to the technical field of road embankment construction, in particular to a method for ecologically filling road embankments with high-strength steel wire mesh reinforced materials. Background Art

[0002] In recent years, with the rapid development of my country's economy, road traffic volume has increased year by year, and the traffic volume of some roads has approached saturation. In response, in order to meet the growing traffic demand and social development needs, more and more road reconstruction and expansion projects have been launched. The construction of these projects has high technical and economic value in improving the road network structure and enhancing the road service level.

[0003] Embankments are an essential part of the road construction process. Embankments refer to fill roadbeds with the top surface higher than the original ground. Embankments are line structures with a certain density built on natural ground with soil or stone. The most important control factor in embankment construction is the stability of the embankment. Public literature also reports some embankment structures and construction methods, such as:

[0004] 1. Chinese Patent: A road embankment structure and construction method for widening a highway near water, application number 201310561704.1, application date: 2013.11.12, applicant: Jiangsu Zhenjiang Road and Bridge Engineering Corporation, address 212000, No. 69, Nanshan Road, Runzhou District, Zhenjiang City, Jiangsu Province, inventors: Guan Helou, Zhao Xiujuan, Liu Lin, Dai Chaoming, Li Hongwei, abstract: The present invention relates to a road embankment structure for widening a highway near water, characterized in that water-blocking maintenance piles are arranged on the water-facing side of the new embankment, and a riprap weight body is arranged on the outer side of the maintenance pile; the lower part of the new embankment is a solidified soil layer, and the upper part is a lightweight filler layer, and a transverse reinforcement body and a vertical reinforcement body are arranged at the contact between the solidified soil layer and the lightweight filler layer; a grouting reinforcement body is arranged in the original embankment, and the front end of the grouting reinforcement body is a reinforced connecting section; a water-blocking layer is arranged on the top surface, the outer side slope and both sides of the maintenance pile of the new embankment, and an anti-seepage blanket is arranged at the bottom of the riprap weight body. The present invention can not only enhance the connection strength and integrity of the new and original embankments, but also prevent the infiltration of external water bodies from multiple levels, and can also improve the anti-floating performance of the embankment, thus having good technical and economic benefits. The present invention also provides a construction method for the widened embankment structure.

[0005] 2. Chinese Patent: A high-speed railway lattice embankment structure and construction method, application number: 201611193207.0, application date: 2016.12.21, applicant: China Railway Eryuan Engineering Group Co., Ltd., address: No. 3 Tongjin Road, Chengdu City, Sichuan Province 610031, inventors: Yao Yuchun, Wei Yongxing, Li Anhong, Liu Yang, Xiao Chaoqian, abstract: A high-speed railway lattice embankment structure and construction method, so as to realize the construction of high-speed railway embankment with non-improved natural fine-grained fillers, thereby greatly saving engineering investment. It includes: an embankment substructure, which is filled in layers on the foundation with natural fine-grained soil; a lattice structure, which is buried in the embankment substructure at intervals along the longitudinal direction, each lattice structure includes at least two reinforced concrete frames arranged in layers vertically, and grouting anchor rods arranged at intervals, each grouting anchor rod vertically passes through the reinforced concrete frame, and its lower end enters the foundation rock and soil; a drainage layer, which is arranged on the top of the embankment substructure; an embankment surface structure, which is filled on the top of the drainage layer with graded crushed stone; and a track foundation, which is arranged on the top of the embankment surface structure.

[0006] 3. Chinese Patent: A high-speed railway prestressed embankment fill structure and construction method thereof, application number: 201710022246.2, application date: 2017.01.12, applicant: China Railway Eryuan Engineering Group Co., Ltd., address: No. 3 Tongjin Road, Chengdu City, Sichuan Province 610031, inventors: Yao Yuchun, Li Anhong, Luo Zhaoxin, Liu Yang, Pang Yinggang, Xiao Chaoqian, Zeng Yonghong, Zhao Qinghai, Wang Zhimeng, abstract: A high-speed railway prestressed embankment fill structure and construction method thereof, to meet the needs of building high-speed railway embankment projects in areas lacking high-quality roadbed fillers, and has good economy. The embankment fill structure includes: a lower fill, which is compacted and filled on the foundation in layers using ordinary roadbed fillers; a surface layer of the embankment base bed, which is filled in layers on the top of the lower fill; a prestressed reinforcement layer, which is arranged in layers in the lower fill; and U-shaped geobars, which are arranged in layers at intervals, with their open ends passing downward through the prestressed reinforcement layer and inserted into the lower fill.

[0007] 4. Chinese patent: A stepped reinforced earth embankment structure, application number 201320183269.9, application date: 2013.04.12, patentee: China Railway First Survey and Design Institute Group Co., Ltd., address: No. 2, Xiying Road, Xi'an City, Shaanxi Province, 710043, inventors: Xue Zengli, Zhang Zongtang, Huang Weidong, Shen Hua, Qiao Xiaoping, He Qian, abstract: The utility model relates to a stepped reinforced earth embankment structure. In areas restricted by terrain and landforms, reinforced earth is often used to steepen the embankment slope. It is difficult to green the slope. The later slope protection construction is easy to destroy the integrity of the embankment. The soil in the triangle area outside the reinforcement belt is damaged by human or natural factors. The utility model has shoulders on both sides of the top of the steep embankment slope, and wall footings on both sides of the bottom of the slope. Multiple transverse ribs are arranged from top to bottom in the embankment. The edges of the ribs near the slope are connected with L-shaped retaining plates folded upward. The L-shaped retaining plates are filled with roadbed fillers synchronously with the embankment, so that the slope forms a stepped structure. Mutually orthogonal steel bars are arranged in the L-shaped retaining plates, and connecting ribs for connecting with the ribs are arranged at the edges. Drain holes and seepage plates are also arranged. The utility model has good stability. The installation of the L-shaped retaining plates is carried out synchronously with the filling of the embankment, so as to ensure the integrity of the slope protection project and the filling of the embankment, and it is easy to carry out slope greening in combination with the surrounding environment.

[0008] 5. Chinese Patent: Fine-grained soil slope embankment filling structure, application number: 201521046546.7, application date: 2015.12.15, patentee: China Railway Eryuan Engineering Group Co., Ltd., address: No. 3 Tongjin Road, Chengdu City, Sichuan Province, 610031, inventors: Yao Yuchun, Zhang Yao, Liu Yang, Zhao Qinghai, Yuan Biyu, abstract: Fine-grained soil slope embankment filling structure is used to effectively solve the problem of embankment construction in areas with limited land use and lack of excellent embankment filling materials. It includes: fine-grained soil filling body, which is filled in the middle part of the embankment; gabions, which are stacked on both sides of the slope of the fine-grained soil filling body; the surface layer of the embankment base bed, which is filled in the fine-grained soil filling body and the top of the gabions; composite geomembrane, which is set at the bottom of the surface layer of the embankment base bed with a full section; geogrids, which are laid in layers in the fine-grained soil filling body, and its two ends are connected to the gabions.

[0009] According to research, in order to ensure the stability of the roadbed soil, high embankment roads constructed under normal working conditions use qualified roadbed fillers to compact and fill layer by layer. The fill slopes on both sides of the roadbed are usually set with a relatively gentle slope, generally 1.5~1:1.75, and the slopes are planted with grass and green after filling. However, when the construction land is restricted, the roadbed is filled with a nearly vertical slope, and the conventional layer-by-layer filling method cannot be implemented. Various retaining walls are often used on the outside of the roadbed to ensure the stability of the roadbed structure. The retaining wall support structure is basically a gray building such as mortar-laid rubble or concrete, and the greening effect is often poor, which cannot meet the green landscape requirements of the roadbed slope. Summary of the invention

[0010] The purpose of the present invention is to provide a method for ecologically filling road embankments with high-strength steel wire mesh reinforced materials. The filling method can be used for steeper roadbed fill slopes, can save land, has low bearing capacity for the foundation, has the characteristics of stable filled roadbed structure, good landscaping effect of roadbed slopes, and low cost.

[0011] In order to achieve the purpose of the present invention, the technical solution adopted is:

[0012] A method for ecologically filling road embankments with high-strength steel wire mesh reinforced materials, the filling steps are as follows:

[0013] (1) Bend one end of a 3-5m wide high-strength steel wire mesh according to the designed inclination angle of the embankment slope, and reserve a section of the mesh surface at the corner edge as the reverse cover surface. The reverse cover surface is at the top of the folded edge, and the length of the reverse cover surface is not less than 0.6m. Put the high-strength steel wire mesh in place at the roadbed filling position.

[0014] (2) Starting from the bottom paving layer, high-strength steel wire mesh is laid horizontally in sections according to the required roadbed length, that is, the corner side of the high-strength steel wire mesh faces outward, and the laying width of the high-strength steel wire mesh on the roadbed is not less than 4m; and each section of the high-strength steel wire mesh is connected by twisting the edges.

[0015] (3) Lay plant ecological mats along the corners of the high-strength steel wire mesh and backfill the corners with planting soil in time. The width of the planting soil should not be less than 20 cm.

[0016] (4) On the high-strength steel wire mesh, the roadbed filling requirements are followed and the roadbed compaction thickness is no more than 30 cm. Each layer is rolled after filling. The compaction strength should meet the compaction requirements of the corresponding grade of road. The filling is continued layer by layer.

[0017] (5) After the compacted fill thickness reaches the designed reinforcement mesh spacing, fold the high-strength steel wire mesh cover surface to the compacted fill surface and fix the cover surface to the compacted fill surface with a fixing rod. The reinforcement mesh spacing is generally 2-3 times the thickness of a layer of compacted fill.

[0018] (6) Insert local rooted plant strips under the cover, and let the plant strips grow outward from the folded corners.

[0019] (7) Repeat steps 1 to 6 above and continue filling according to the design until it approaches the top of the roadbed. During filling construction, a 20 cm thick gravel drainage layer is set on the second or third high-strength steel wire mesh from the bottom, and a geotechnical drainage mat is set on the corner side away from the high-strength steel wire mesh. The geotechnical drainage mat is inclined from top to bottom toward the wall side and connected to the gravel drainage layer to remove moisture from the roadbed fill.

[0020] (8) Plant local grass species on the outside of the plant ecological mat so that grass can grow on the plant ecological mat to meet the requirements of green plant landscape.

[0021] Preferably, the rear of the planting soil is filled with gravel permeable filler, and the filling width of the gravel permeable filler is 0.25-0.35m. This width is the lateral width.

[0022] Preferred: Before compacting the fill, the surface of the high-strength steel wire mesh must be fixed to the ground with support, and the high-strength steel wire mesh must be guaranteed to have a fill of not less than 0.2m thick to protect the high-strength steel wire mesh from being damaged by compression. When compacting, the roller's route should be from the middle of the high-strength steel wire mesh to the tail first, and then from the middle to the wall. The roller moves in a direction parallel to the wall, using full-floor light compaction, and then heavy compaction. The fill is compacted in layers, with each layer loosely laid at a height of about 0.3m. Within 1m from the wall, the roller shall not be used to apply pressure, but a light compactor shall be used. Except for the planting soil of the wall, other fillings must be compacted, and the roller's rolling overlap width shall not be less than 1 / 3 of the rolling equipment width.

[0023] Preferably, the fill soil is sandy soil with a maximum particle size of no more than 10 cm.

[0024] Preferably, the stranded connection of each high-strength steel wire mesh is achieved by twisting the stranded steel wire, which is of the same grade as the steel wire of the high-strength steel wire mesh, 2.2mm diameter galvanized plastic-coated steel wire, and is twisted with single-turn winding and double-turn locking intervals, with double-turn intervals of 13-18cm.

[0025] Preferably, the plant ecological mat is a coconut coir mat, which is arranged on the inner side of the folded corner of the high-strength steel wire mesh, and the length of the coconut coir mat's reversed covering surface is more than 0.3m.

[0026] For high embankment roads constructed under normal working conditions, qualified roadbed fillers are used to compact and fill layer by layer to ensure the stability of the roadbed soil. The fill slopes on both sides of the roadbed are usually set with a relatively gentle slope, generally 1.5 to 1:1.75, and the slopes are planted with grass and green after filling. When the construction land is restricted, the roadbed is filled with a nearly vertical slope, but various retaining walls are often used on the outside of the roadbed to ensure the stability of the roadbed structure. The retaining wall support structure is basically a gray building such as mortar-laid slabs or concrete, and the greening effect is often poor. This technology is very suitable for roads with limited land use, insufficient foundation bearing capacity, and high requirements for roadbed slope greening. The slope can be set to 1:0.466. The reinforced soil composed of fill, high-strength steel wire mesh reinforcement and plant ecological mats can withstand the lateral pressure of the fill soil to form a stable composite structure for the roadbed fill. The principle is that the lateral pressure of the fill soil is mainly balanced by the friction between the high-strength steel wire mesh reinforcement and the soil. That is, after the reinforcement material is pulled, it attempts to pull the reinforcement material out of the soil, and the friction between the reinforcement and the soil will prevent the reinforcement from being pulled out. When the tension in the reinforcement material and the friction between the reinforcement and the soil are balanced, the interior of the reinforced cushion layer is stabilized.

[0027] Comparison of the characteristics of this technology and traditional embankment (see the table below:)

[0028] BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the high-strength steel wire mesh reinforced material ecological filling road embankment;

[0030] Figure 2 yes Figure 1 Middle partial enlarged picture;

[0031] Figure 3 It is a schematic diagram of the folding edge of the high-strength steel wire mesh;

[0032] Figure 4 It is a schematic diagram of the twisted edge connection of high-strength steel wire mesh;

[0033] Figure 5 This is a schematic diagram of laying plant ecological mats and backfilling planting soil at the corners of high-strength steel wire mesh;

[0034] Figure 6 It is a schematic diagram of layered compaction of backfill soil;

[0035] Figure 7 It is a schematic diagram of the folded and reversed cover after layered rolling;

[0036] Figure 8 It is a schematic diagram of inserting rooted plant strips;

[0037] Fig. 9 It is a schematic diagram of planting grass seeds after completing the layered filling and paving;

[0038] The names of the parts with serial numbers in the figure are:

[0039] 1. High-strength steel wire mesh, 2. Covering surface, 3. Plant ecological mat, 4. Planting soil, 5. Sand and gravel permeable filler, 6. Filling, 7. Geotechnical drainage mat, 8. Gravel drainage layer, 9. Coconut palm mat covering surface, 10. Folded corners, 11. Twisted steel wire, 12. Fixed rod, 13. Plant strips, 14. Local grass seeds. DETAILED DESCRIPTION

[0040] In order to describe the present technology more clearly, the present technology is further described in detail below with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] The following steps can be used to complete the ecological filling of road embankments with high-strength wire mesh reinforcement materials:

[0043] (1) One end of a 3-5m wide high-strength steel wire mesh 1 is bent at an angle 10 according to the designed inclination of the embankment slope, and a reverse cover surface 2 is reserved. The reverse cover surface 2 is at the top of the angle 10 of the high-strength steel wire mesh 1. The length of the reverse cover surface 2 is not less than 0.6m, and the high-strength steel wire mesh 1 is placed in place at the roadbed filling position.

[0044] (2) Starting from the bottom layer, high-strength steel wire mesh 1 is laid horizontally in sections according to the required roadbed length, that is, the corner 10 side of the high-strength steel wire mesh 1 faces outward, and the laying width of each high-strength steel wire mesh 1 on the roadbed is not less than 4m; and each section of the high-strength steel wire mesh 1 is twisted and connected. The twisted edge connection of each section of the high-strength steel wire mesh 1 is twisted and connected by twisted steel wire 11. The twisted steel wire 11 is of the same grade as the steel wire of the high-strength steel wire mesh 1, with a diameter of 2.2mm galvanized plastic-coated steel wire, and the twisting is performed with a single-turn winding and a double-turn locking interval, and the double-turn interval is 13-18cm.

[0045] (3) Lay a plant ecological mat 3 along the fold 10 of the high-strength steel wire mesh 1, and backfill the fold 10 with planting soil 4 in time. The width of the planting soil 4 should not be less than 20 cm.

[0046] (4) Fill the high-strength steel wire mesh 1 with soil 6 according to the roadbed filling requirements, and control the filling in layers according to the roadbed compaction thickness of no more than 30cm. Roll after each layer of soil filling 6. The compaction strength should meet the road compaction requirements of the corresponding level, and continue to fill layer by layer. Before compacting the soil filling 6, the mesh surface of the high-strength steel wire mesh 1 must be supported and fixed to the ground. The high-strength steel wire mesh 1 must have a soil filling 6 of no less than 0.2m thick to protect the high-strength steel wire mesh 1 from being damaged by compression. When compacting, the roller's route should be from the middle of the high-strength steel wire mesh 1 to the tail first, and then from the middle to the wall. The roller moves in a direction parallel to the wall, using full-chamber light compaction and then heavy compaction. The filling soil 6 is compacted in layers, with each layer being about 0.3m high. Within 1m of the wall, a roller shall not be used to apply pressure, but a light compactor shall be used. Except for the wall planting soil 4, other filling materials must be compacted, and the rolling overlap width of the roller shall not be less than 1 / 3 of the width of the compaction equipment. The filling soil 6 is sandy soil with a maximum particle size of no more than 10cm.

[0047] (5) After the compacted thickness of the fill 6 reaches the designed reinforcement mesh spacing, the reverse cover surface 2 of the high-strength steel wire mesh 1 is folded to the compacted surface of the fill 6 and fixed with a fixing rod 12; the fixing rod 12 fixes the reverse cover surface 2 to the compacted surface of the fill 6; the reinforcement mesh spacing is 2-3 times the thickness of a layer of compacted fill.

[0048] (6) A local plant strip 13 with roots is inserted under the reverse cover surface 2, and the plant strip 13 grows outward from the folded corner 10.

[0049] (7) Repeat the above steps 1 to 6 and continue filling according to the design until it approaches the top of the roadbed; during filling construction, a 20 cm thick gravel drainage layer 8 is set on the second or third high-strength steel wire mesh 1 from the bottom, and a geotechnical drainage mat 7 is set on the side of the corner 10 away from the high-strength steel wire mesh 1. The geotechnical drainage mat 7 is inclined from top to bottom toward the wall side and connected to the gravel drainage layer 8 to remove moisture from the roadbed filling body.

[0050] (8) Planting local grass seeds 14 on the outer side of the plant ecological mat 3 so that grass grows on the planting soil 4 to meet the requirements of green plant landscape.

[0051] Example 2

[0052] The following steps can be used to complete the ecological filling of road embankments with high-strength wire mesh reinforcement materials:

[0053] (1) One end of a 3-5m wide high-strength steel wire mesh 1 is bent at an angle 10 according to the designed inclination of the embankment slope, and a reverse cover surface 2 is reserved. The reverse cover surface 2 is at the top of the angle 10 of the high-strength steel wire mesh 1. The length of the reverse cover surface 2 is not less than 0.6m, and the high-strength steel wire mesh 1 is placed in place at the roadbed filling position.

[0054] (2) Starting from the bottom paving layer, high-strength steel wire mesh 1 is laid horizontally in sections according to the required roadbed length, that is, the folded corner 10 side of the high-strength steel wire mesh 1 faces outward, and the laying width of each high-strength steel wire mesh 1 on the roadbed is not less than 4m; and each section of the high-strength steel wire mesh 1 is twisted and connected; the twisted edge connection of each section of the high-strength steel wire mesh 1 is twisted and connected by twisted steel wire 11, which is of the same grade as the steel wire of the high-strength steel wire mesh 1, with a diameter of 2.2mm galvanized plastic-coated steel wire, and the twisting is performed with a single-turn winding and a double-turn locking interval, and the double-turn interval is 13-18cm.

[0055] (3) A plant ecological mat 3 is laid along the folded corner 10 of the high-strength steel wire mesh 1. The plant ecological mat 3 is a coconut palm mat, which is arranged on the inner side of the folded corner 10 of the high-strength steel wire mesh 1, and the length of the coconut palm mat back-wrapped cover 9 is more than 0.3m. The planting soil 4 is backfilled in time at the folded corner 10, and the width of the planting soil 4 is not less than 20cm; the back of the planting soil 4 is filled with gravel permeable filler 5, and the filling width of the gravel permeable filler 5 is 0.25-0.35m. This width is the horizontal width.

[0056] (4) Fill soil 6 on the high-strength steel wire mesh 1 according to the roadbed filling requirements, and control the filling in layers according to the roadbed compaction thickness of no more than 30 cm. Roll after each layer of fill soil 6. The compaction strength should meet the road compaction requirements of the corresponding grade, and continue to fill layer by layer in sequence. Before compacting the fill soil 6, the mesh surface of the high-strength steel wire mesh 1 must be stretched and fixed to the ground. A fill soil 6 of no less than 0.2 m thick is guaranteed on the high-strength steel wire mesh 1 to protect the high-strength steel wire mesh 1 from being damaged by compression. When compacting, the roller's route should be from the middle of the high-strength steel wire mesh 1 to the tail first, and then from the middle to the face wall. The roller moves in a direction parallel to the face wall, using full-chamber light compaction and then heavy compaction. The filling soil 6 is compacted in layers, with each layer being about 0.3m high. Within 1m of the wall, a roller shall not be used to apply pressure, but a light compactor shall be used. Except for the wall planting soil 4, other filling materials must be compacted, and the rolling overlap width of the roller shall not be less than 1 / 3 of the width of the compaction equipment. The filling soil 6 is sandy soil with a maximum particle size of no more than 10cm.

[0057] (5) After the compacted thickness of the fill 6 reaches the designed reinforcement mesh spacing, the reverse cover surface 2 of the high-strength steel wire mesh 1 is folded to the compacted surface of the fill 6 and fixed with a fixing rod 12; the fixing rod 12 fixes the reverse cover surface 2 to the compacted surface of the fill 6, and the reinforcement mesh spacing is 2-3 times the thickness of a layer of compacted fill.

[0058] (6) A local plant strip 13 with roots is inserted under the reverse cover surface 2, and the plant strip 13 grows outward from the folded corner 10.

[0059] (7) Repeat the above steps 1 to 6 and continue filling according to the design until it approaches the top of the roadbed; during filling construction, a 20 cm thick gravel drainage layer 8 is set on the second or third high-strength steel wire mesh 1 from the bottom, and a geotechnical drainage mat 7 is set on the side of the corner 10 away from the high-strength steel wire mesh 1. The geotechnical drainage mat 7 is inclined from top to bottom toward the wall side and connected to the gravel drainage layer 8 to remove moisture from the roadbed filling body.

[0060] (8) Plant local grass seeds 14 on the outside of the plant ecological mat 3 so that grass grows on the planting soil 4 to meet the requirements of green plant landscape. The plant ecological mat 3 is a coconut palm mat, which is arranged on the inner side of the folded corner 10 of the high-strength steel wire mesh 1, and the length of the coconut palm mat reverse cover 9 is more than 0.3m.

[0061] Application Cases

[0062] This technology has been successfully used in the construction of Shatanjiang Avenue in Fangchenggang Bus Logistics Park and Jiangbei Middle Road in Chongzuo.

[0063] 1. The Qisha Interchange on Shatanjiang Avenue in Fangchenggang Bus Logistics Park is designed to cross Qisha Avenue on the main line of Shatanjiang Avenue, and the auxiliary road and Qisha Avenue are set up with a T-shaped plane intersection controlled by a signal light at the bottom of the bridge. A retaining wall needs to be set between the bridgehead approach and the auxiliary road of the main bridge to transition to the same elevation. Interchanges in cities basically encounter this problem, but the difference of this project is that the main and auxiliary roads at the north end are both located on a 16-meter high fill roadbed, which means that the base of the retaining wall is located on high fill. Conventional retaining wall designs require that the retaining wall foundation is located on an old soil foundation with a certain bearing capacity (about 200KPa). That is, two elements must be met, one is sufficient bearing capacity, and the other is that the base bearing capacity must be uniform, and uneven settlement is not allowed. The high embankment filling method of setting up a green ecological reinforced soil retaining wall with high-strength steel wire mesh can adapt to foundation settlement, meet the foundation bearing capacity requirements, have a good green landscape effect, and control the land use, effectively solving the above problems.

[0064] 2. The Jiangbei Middle Road K0+440~K0+600 section of the Chongzuo Zuojiang River Coastal Road Project is adjacent to the Zuojiang River in the south. The river bank is extremely steep, and the road edge is less than 5m from the top of the river bank. There is insufficient space for slope filling according to conventional roadbed slopes. In order to meet the on-site construction land conditions, while considering the economic efficiency and riverside landscape requirements, the design adopts the filling method of this application.

[0065] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present application should fall within the scope of protection of the present application.

Claims

1. A method for ecologically filling road embankments with high-strength steel wire mesh reinforced materials, characterized in that: For roads with limited land use, insufficient foundation bearing capacity, and high requirements for roadbed slope greening, the slope ratio is set to 1:0.466 for steeper roadbed fill slopes. The filling steps are as follows: (1) Bend one end of a 3-5m wide high-strength steel wire mesh according to the designed inclination angle of the embankment slope, and reserve a mesh surface at the folded edge as the reverse cover surface. The reverse cover surface is at the top of the folded edge, and the length of the reverse cover surface is not less than 0.6m. Put the high-strength steel wire mesh in place at the roadbed filling position; (2) Starting from the bottom layer, high-strength steel wire mesh is laid horizontally in sections according to the required roadbed length, with the folded corner 10 side of the high-strength steel wire mesh facing outwards. The laying width of each section of high-strength steel wire mesh on the roadbed is not less than 4m; and each section of high-strength steel wire mesh is connected by twisting the edges; (3) Lay plant ecological mats along the corners of the high-strength steel wire mesh and backfill the corners with planting soil in time. The width of the planting soil should not be less than 20 cm; (4) On the high-strength steel wire mesh, fill the roadbed in layers according to the roadbed compaction thickness of no more than 30 cm. Roll each layer after filling. The compaction strength should meet the compaction requirements of the corresponding level of road. Continue filling layer by layer in sequence; (5) After the compacted fill thickness reaches the designed reinforcement mesh spacing, fold the high-strength steel wire mesh cover surface to the fill compacted surface and fix the cover surface to the fill compacted surface with a fixing rod. The reinforcement mesh spacing is 2-3 times the thickness of one layer of compacted fill; (6) Insert local rooted plant strips under the cover, and let the plant strips grow outward from the folded corners; (7) Repeat the above steps 1-6 and continue to fill according to the design until it approaches the top of the roadbed; during the filling construction, a 20 cm thick gravel drainage layer is set on the second or third high-strength steel wire mesh from the bottom, and a geotechnical drainage mat is set on the corner side away from the high-strength steel wire mesh. The geotechnical drainage mat is inclined from top to bottom toward the wall side and connected to the gravel drainage layer to drain the moisture in the roadbed filling body; the top surface of the road embankment is sequentially set with a road cushion layer, a road base layer and a road surface layer from bottom to top; (8) Planting local grass species on the outer slope of the plant ecological mat so that grass can grow on the plant ecological mat to meet the requirements of green plant landscape; The rear of the planting soil is filled with sand and gravel permeable filler, and the filling width of the sand and gravel permeable filler is 0.25-0.35m, which is the horizontal width; before the fill is compacted, the mesh surface of the high-strength steel wire mesh must be stretched and fixed close to the ground, and the high-strength steel wire mesh must be guaranteed to have a fill of not less than 0.2m thick to protect the high-strength steel wire mesh from being damaged by compression. When compacting, the roller's route should be from the middle of the high-strength steel wire mesh to the tail first, and then from the middle to the wall. The roller walks in a direction parallel to the wall, using full-hall light compression, and then heavy compression. The fill is filled and compacted in layers, and the loose laying height of each layer is about 0.3m. The roller shall not be used to apply pressure within 1m from the wall. , and a light compactor is used. Except for the wall planting soil, other fillings must be compacted, and the rolling overlap width of the roller shall not be less than 1 / 3 of the width of the rolling equipment; the fill soil is sandy soil with a maximum particle size of no more than 10cm; the high-strength steel wire mesh is connected by twisted edge connection using twisted steel wire, the twisted steel wire is of the same grade as the steel wire of the high-strength steel wire mesh, with a diameter of 2.2mm galvanized plastic-coated steel wire, and the twisting is performed by single-turn winding and double-turn locking intervals, with a double-turn interval of 13-18cm; the plant ecological mat is a coconut palm mat, which is arranged on the inner side of the folded corner of the high-strength steel wire mesh, and the length of the coconut palm mat reversed cover is 0.3m.

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