CN106368238B - A kind of honeycomb geotechnical grid retaining wall and its construction method with ecological recovery function - Google Patents

A kind of honeycomb geotechnical grid retaining wall and its construction method with ecological recovery function Download PDF

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Publication number
CN106368238B
CN106368238B CN201610935810.5A CN201610935810A CN106368238B CN 106368238 B CN106368238 B CN 106368238B CN 201610935810 A CN201610935810 A CN 201610935810A CN 106368238 B CN106368238 B CN 106368238B
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China
Prior art keywords
slope
drainpipe
loess
polypropylene
dirt
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CN201610935810.5A
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CN106368238A (en
Inventor
谢婉丽
郭倩怡
魏保民
杜蕾
王新刚
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Northwest University
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Northwest University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/02Retaining or protecting walls
    • E02D29/0225Retaining or protecting walls comprising retention means in the backfill
    • E02D29/0241Retaining or protecting walls comprising retention means in the backfill the retention means being reinforced earth elements
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines

Abstract

The present invention provides a kind of honeycomb geotechnical grid retaining wall and its construction method with ecological recovery function, including be arranged on the ground basis and be arranged on the basis of wall, wall includes the reinforcement cushion being laid on successively in slope surface, composite geo-membrane, reinforced polypropylene drainage module, long filament geotextiles and honeycomb geotechnical grid;Basic and reinforcement cushion includes reinforcement dirt improvement loess, polypropylene direction earthwork grille and drainpipe, and polypropylene direction earthwork grille is multiple and is arranged in parallel in reinforcement dirt improvement loess;The drainpipe in drainpipe and basis in reinforcement cushion connects with reinforced polypropylene drainage module respectively.Honeycomb geotechnical grid retaining wall bearing capacity and dynamic performance provided by the invention with ecological recovery function are higher, antiskid, erosion resistance are strong, crushed stone soil layer can be filled inside it, and the grass planting in crushed stone soil layer, it can not only be effectively prevent soil erosion, but also there are Greening functions, to realize effective combination of ecological recovery and engineering control, and construction method is simple, and it is easy for construction, it is at low cost.

Description

A kind of honeycomb geotechnical grid retaining wall and its construction method with ecological recovery function
Technical field
The invention belongs to Geological Engineering construction technique fields, are related to a kind of honeycomb geotechnical grid with ecological recovery function Retaining wall, the invention further relates to the construction methods of this retaining wall.
Background technology
Retaining wall is widely used in the supporting and retaining systems such as side slope, embankment, dam as one of Treatment process in ground support engineering Engineering.Traditional retaining wall mostly uses greatly the construction material as retaining wall such as mortar flag stone, concrete, due to these material stiffnesses Greatly, and tension, shearing strength and tensile atrain are relatively low, therefore, it is damaged often to occur retaining wall after a period of use, and Breakage once occurs for retaining wall, and because its globality is compared with causing by force reparation difficulty big, rehabilitation cost is high, and later maintenance work is numerous It is trivial.Simultaneously as traditional retaining wall construction is complicated, required construction personnel is more and relatively high etc. reasons of freight cause Its cost is high, therefore slope treatment work is made to be difficult to carry out extensively.Furthermore traditional retaining wall retaining structure ignores life more The environmentally friendly greening function that state is restored, especially in the Northwest due to drought, rainwater is poor, and vegetation survival rate is relatively low to be led Shortage of water resources is caused, this area is caused to be difficult to be timed the greening vegetation of the retaining structures such as embankment, side slope and regularly spray, To be difficult to realize demand that is environmentally protective, beautifying the environment.For traditional retaining wall cracky, construction is complicated, and cost is higher Problem and the poor phenomenon of the Northwest's rainwater, how economical rationality is meeting the construction of the retaining engineerings such as slope, embankment, dam On the basis of, reach environmentally protective, beautiful environment demand, becomes those skilled in the art's urgent problem to be solved.Based on this, Special a kind of honeycomb geotechnical grid retaining wall with ecological recovery function of proposition of the invention.
In the present invention, the gradient refers to the ratio of the vertical height of slope surface and the horizontal distance of slope surface.Ratio of slope refers to the vertical height of slope surface The ratio of degree and the horizontal distance of slope surface.Compacting factor dry density of the base through actually reaching that show the way is obtained with by hit-solid experiment Sample maximum dry density ratio.The ratio between dry density and standard maximum dry density after compactness finger pressure reality.
Invention content
The purpose of the present invention is to provide a kind of honeycomb geotechnical grid retaining walls with ecological recovery function, solve tradition Retaining wall cracky, construction complexity, the higher problem of cost.
Second object of the present invention is to provide the construction method of above-mentioned retaining wall.
The technical scheme is that:A kind of honeycomb geotechnical grid retaining wall with ecological recovery function, including setting Basis on the ground, and be arranged on the basis of wall, basis and wall between separated by the first composite geo-membrane, wall Body includes the reinforcement cushion being laid on successively in slope surface, the second composite geo-membrane, reinforced polypropylene drainage module, long filament geotechnique Cloth and honeycomb geotechnical grid;Basis includes the two-way soil of the first polypropylene that dirt is improved loess and is arranged in dirt improvement loess Work grid, the first drainpipe, the first drainpipe are connected with reinforced polypropylene drainage module;Reinforcement cushion includes dirt improvement Loess and be arranged dirt improvement loess in the second polypropylene direction earthwork grille, the second drainpipe, the second drainpipe also with Reinforced polypropylene drainage module is connected.
Preferably, the side-lower of above-mentioned wall is equipped with gutter, and above-mentioned first drainpipe is built in basic internal upper part, and first Drainpipe is tilted down with the ratio of slope not less than 4 ‰ along the direction far from slope surface, the upper end of the first drainpipe and reinforced polypropylene Drainage module connects, lower end and gutter are connected.
Preferably, above-mentioned honeycomb geotechnical grid is the three-dimensional netted cell compartment welded by high-strength polyethylene material and formed, Gravelly soil is filled in honeycomb geotechnical grid, gravelly soil is equipped with the vegetable layer formed by planting flowers and plants.
Preferably, above-mentioned long filament geotextiles are by polyester filament networking and three-dimensional structure made of consolidating.
Preferably, above-mentioned reinforced polypropylene drainage module is netted made of regenerated environment protecting high-strength polypropylene material Structure, bottom are three-dimensional composite drainage network;The reinforced polypropylene drainage module is multiple and is assembled into case to be layed in second multiple It closes on geotechnological lattice film.
Preferably, the compacting factor of above-mentioned dirt improvement loess is greater than or equal to 0.95;The above-mentioned two-way soil of first polypropylene Work grid and the second polypropylene direction earthwork grille are that the multiple and horizontal dirt that is layed in is improved in loess, and adjacent first is poly- The distance between propylene direction earthwork grille is 0.2m, and the distance between second adjacent polypropylene direction earthwork grille is also 0.2m
Preferably, above-mentioned second drainpipe is multiple and is dipped down along the direction far from slope surface with the ratio of slope not less than 4 ‰ Tiltedly setting, the distance between second adjacent drainpipe are 0.5m, one end and the reinforced polypropylene drainage mould of the second drainpipe Block connection, the other end are inserted into slope surface.
Second technical solution of the present invention is the structure of the above-mentioned honeycomb geotechnical grid retaining wall with ecological recovery function Building method includes the following steps:
Preparation and slope leveling before step 1, construction;
Step 2 excavates slope surface and foundation pit, and slope surface excavates the gradient and is less than or equal to 1:0.275, the slope surface after excavation is carried out It modifies, leveling compacting is carried out to bottom of foundation ditch loess after excavation of foundation pit, compacting factor is greater than or equal to 0.93;
Step 3, basis construct:
1) by loess and dirt according to 7:3 weight ratio adds water to carry out mix formation dirt improvement loess through mixer, makes The yellow soil's water content of dirt improvement is transported at construction, is filled, compacting operation close to after the ground loess optimum moisture content;Often The dirt improvement loess for filling out 20cm-25cm thickness is tamped to the compactness not less than 95%;It is improved in loess every 0.2 in dirt Rice is laid with the first polypropylene direction earthwork grille;It is laid with the first drainpipe, the first drainpipe upper end in dirt improvement loess top To connect with the reinforced polypropylene drainage module in wall, lower end will connect with gutter, the first drainpipe is to be not less than 4 ‰ Ratio of slope tilted down along far from the direction of slope surface;
2) first composite geo-membrane of the breadth more than 1m is selected to be laid in above dirt improvement loess, connector uses gluing, It flattens between first composite geo-membrane and between the first composite geo-membrane and base surface and is adjacent to, the first composite geo-membrane is tied with periphery Expansion bolt and steel plate press strip anchor connection, connecting portion brushing emulsified asphalt bonding are used between structure object;
Step 4, wall are constructed:
1) reinforcement cushion is built by laying bricks or stones:By loess and dirt according to 7:3 weight ratio adds water progress mix to be formed through mixer Dirt improves loess, is transported at construction, according to slope masonry, compacting;It is improved in loess in dirt and is laid with second poly- third every 0.2 meter Alkene direction earthwork grille;It builds the gradient by laying bricks or stones and is not less than 1:0.275;10cm thickness is often filled out to tamp to the compactness not less than 95%;Ash The second drainpipe of setting is repaiied every 0.5m in the good loess of land reform, the second drainpipe is with the ratio of slope not less than 4 ﹪ along separate slope surface Direction tilts down;One end of second drainpipe is contacted with slope surface, the other end by with the reinforced polypropylene drainage mould in wall Block connects;
2) laying of the second composite geo-membrane:Second composite geo-membrane is laid on reinforcement cushion, the second composite earthwork Film web is wider than 1m, and connector uses gluing, is flattened between the second composite geo-membrane and between the second composite geo-membrane and reinforcement cushion It is adjacent to, the second composite geo-membrane uses expansion bolt and steel plate press strip anchor connection, connecting portion brushing breast with peripheral structure object Change pitch bonding;
3) polypropylene drainage module is laid with:Polypropylene drainage module scene is spliced, case is assembled into, is layed in On second combined earthwork partition film, and connect with the second drainpipe in the first drainpipe and reinforcement cushion in basis;
4) laying of long filament geotextiles:Long filament geotextiles are directly laid in polypropylene by the way of artificial rolling paving and store row In water module, cloth cover is smooth, and suitably there are distortion allowance, is welded between long filament geotextiles, long filament geotextiles and peripheral structure Object uses expansion bolt and steel plate press strip anchor connection, connecting portion brushing emulsified asphalt bonding;
5) honeycomb geotechnical grid is built by laying bricks or stones:Honeycomb geotechnical grid is deployed in long filament geotextiles, smooth-going is stretched, under being close to It holds layer filament geotextiles to pave, is used in combination reinforcing bar to follow closely vertical slope surface and is directly fixed in reinforcement cushion, honeycomb geotechnique Ge Nei fills broken Stone soil, and tamp to the compactness for being not less than 95%, flowers and plants are planted in gravelly soil forms vegetable layer;
Step 5, gutter 9 are built by laying bricks or stones.
Preferably, above-mentioned first composite geo-membrane and the second composite geo-membrane are high-density polyethylene material, thickness 1.25mm。
Preferably, above-mentioned first polypropylene direction earthwork grille and the second polypropylene direction earthwork grille are with high intensity Reinforced earth is made, per linear meter(lin.m.) tensile yield power:Longitudinal 45KN/m, lateral 45KN/m;Per linear meter(lin.m.) yield elongation rate:It is longitudinal 16%, lateral 13%.
The present invention has following beneficial aspects:
1, the honeycomb geotechnical grid retaining wall provided by the invention with ecological recovery function, wall outside in successively by Honeycomb geotechnical grid, long filament geotextiles, reinforced polypropylene drainage module, composite geo-membrane, reinforcement cushion structure, basis are to add Muscle dirt improves loess, and reinforcement material is polypropylene direction earthwork grille, and basic internal builds polypropylene drainpipe, on drainpipe End connects with reinforced polypropylene drainage module, and lower end connects with the gutter for being set to wall underfooting, basic and retaining wall it Between be separated by with composite geo-membrane, can effectively prevent in upper wall body extra rain infiltration to infrastructure.
2, the honeycomb geotechnical grid retaining wall provided by the invention with ecological recovery function, with high-strength polyethylene material For honeycomb geotechnical grid as retaining structure, bearing capacity and dynamic performance are higher, and antiskid, erosion resistance are strong, and it is cellular Construction has good drainage performance, fill in honeycomb geotechnical grid be suitble to improvement gravelly soil constitute have it is powerful laterally limiting and The structure of big stiffness, and flowers and plants are planted in gravelly soil, it can not only prevent erosion, and with the work beautified the environment With.
3, the honeycomb geotechnical grid retaining wall provided by the invention with ecological recovery function, basis are two-way using polypropylene Fill Reinforced With Geogrids dirt improves loess formation, uses long filament geotextiles as filter layer between basis and wall, has good water Power condition and anti-filter condition can effectively play water storage function, have with the reinforced polypropylene drainage module collective effect in wall Effect storage rainwater, provides irrigation resource for the plant on wall, reaches the comprehensive utilization of rainwater;When rainwater storage is more than accumulation When, reinforced polypropylene drainage module forms internal drainage channel with the composite geo-membrane with good barrier effect, by flat The mode of face draining excludes superfluous water rainwater, to achieve the effect that control rainwater yielding flow.
4, the honeycomb geotechnical grid retaining wall provided by the invention with ecological recovery function, reinforcement cushion use polypropylene Direction earthwork grille improves shearing resistance, the compression strength of bed course as reinforcement material.
5, the honeycomb geotechnical grid retaining wall construction method provided by the invention with ecological recovery function, it is convenient to carry out, Speed of application is fast, and cost is relatively low, and cost-saved 50%, meanwhile, plant and drainage module on wall build tool jointly The slope protection system for having ecological functions realizes the comprehensive utilization of rainwater, eliminates influence of the precipitation to retaining wall, raw to reach State restores and effective combination of engineering control.
Description of the drawings
Fig. 1 is the honeycomb geotechnical grid retaining wall schematic diagram provided in an embodiment of the present invention with ecological recovery function.
In figure:1. honeycomb geotechnical grid, 2. long filament geotextiles, 3. reinforced polypropylene drainage modules, 4-1. first are compound Geomembrane, the second composite geo-membranes of 4-2., 5. reinforcement cushions, 6-1. the first polypropylene direction earthwork grilles, 6-2. second poly- third Alkene direction earthwork grille, the first drainpipes of 7-1., the second drainpipes of 7-2., 8. bases, 9. gutters.
Specific implementation mode
Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
Embodiment
A kind of honeycomb geotechnical grid retaining wall with ecological recovery function includes the base of setting on the ground referring to Fig. 1 Plinth 8 and the wall being arranged on basis 8, are separated between basis 8 and wall by the first composite geo-membrane 4-1, and wall includes adding Muscle bed course 5, the second composite geo-membrane 4-2, reinforced polypropylene drainage module 3, long filament geotextiles 2 and honeycomb geotechnical grid 1 and It is successively set in slope surface;Basis 8 includes that dirt improvement loess and the first polypropylene being arranged in dirt improvement loess are two-way TGXG 6, the first drainpipe 7-1, the first drainpipe 7-1 are connected with reinforced polypropylene drainage module 3;Reinforcement cushion 5 Including dirt improvement loess and the second polypropylene direction earthwork grille 6-2 and the second drainpipe that are arranged in dirt improvement loess 7-2, the second drainpipe 7-2 are also connected with reinforced polypropylene drainage module 3.
For the ease of draining, the side-lower of wall is equipped with gutter 9, and the first drainpipe 7-1 in basis 8 is built in basis 8 tops, the upper end of the first drainpipe 7-1 a diameter of 20cm, the first drainpipe 7-1 connects with reinforced polypropylene drainage module 3, Lower end connects with gutter 9, and the first drainpipe 7-1 is tilted down with the ratio of slope not less than 4 ‰ along the direction far from slope surface.
It soil erosion and beautifies the environment in order to prevent, gravelly soil is filled in above-mentioned wall, plantation flowers and plants are formed on gravelly soil Vegetable layer.
In order to ensure the bearing capacity of retaining wall, antiskid, erosion resistance are improved, the height of honeycomb geotechnical grid 1 is 20cm, Honeycomb geotechnical grid 1 is the three-dimensional netted cell compartment welded by hexagon high-strength polyethylene material and formed, and tensile strength is big In or equal to 150MPa.
Long filament geotextiles 2 are by polyester filament networking and three-dimensional structure, the long filament geotextiles 2 made of consolidating have good Hydraulics and anti-consider condition.
Reinforced polypropylene drainage module 3 is the reticular structure made of 100% regenerated environment protecting high-strength polypropylene material, It is highly 20cm, including three layers, bottom is three-dimensional composite drainage network.The reinforced polypropylene drainage module 3 is multiple, Duo Gezeng Strong polypropylene drainage module 3 is assembled into case and is layed on the second combined earthwork partition film 4-2, and being formed inside wall has well The drainage channel of antiseepage effect, superfluous water rainwater is discharged by way of flat drainage, to reach control rainwater total runoff The effect of amount.
In order to improve shearing resistance, the compression strength of bed course, the compacting factor of dirt improvement loess is more than or waits in reinforcement cushion 5 In 0.95;Polypropylene direction earthwork grille 6 in reinforcement cushion 5 is multiple and horizontal laying, the two-way geotechnological lattice of adjacent polypropylene The distance between grid 6 are 0.2m.
In order to effectively prevent the rain infiltration on wall to foundation, above-mentioned first composite geo-membrane 4-1 and second is multiple It is high-density polyethylene material, thickness 1.25mm to close geomembrane 4-2.
In order to improve drainage efficiency, the second drainpipe 7-2 in reinforcement cushion 5 is multiple and with the ratio of slope not less than 4 ‰ Setting is tilted down along the direction far from slope surface, the distance between second adjacent drainpipe 7-2 is 0.5m, the second drainpipe 7- 2 one end is connect with reinforced polypropylene drainage module 3, the other end is inserted into slope surface;The second a diameter of 100mm of drainpipe 7-2.
Dirt improvement loess includes dirt and loess, and the weight ratio of dirt and loess is 3:7.It is found through experiment, this ash The water sensitivity of the good loess of land reform is very low, and the water sensitivity than loess reduces by 60%, simultaneously as dirt has certain water stability And gel strength, therefore lateral deformation of the reinforcement cushion under sound load action is alleviated, and construction is simple, it is cheap.
In order to further increase shearing resistance, the compression strength of retaining wall, it is original that polypropylene direction earthwork grille 6, which is with polypropylene, The high intensity reinforced earth of material is made, per linear meter(lin.m.) tensile yield power:Longitudinal 45KN/m, lateral 45KN/m;Per linear meter(lin.m.) elongation at yield Rate:Longitudinal 16%, lateral 13%.
The construction method of the above-mentioned honeycomb geotechnical grid retaining wall with ecological recovery function, includes the following steps:
Preparation and slope leveling before step 1, construction;
Step 2 excavates slope surface and foundation pit, and slope surface excavates the gradient and is less than or equal to 1:0.275, the slope surface after excavation is carried out It modifies, leveling compacting is carried out to bottom of foundation ditch loess after excavation of foundation pit, compacting factor is greater than or equal to 0.93, after compacting, It carries out an acceptance inspection, non-compliant substrate is handled;
Step 3, basis 8 are constructed:
(1) by loess and dirt according to 7:3 weight ratio adds water to carry out mix formation dirt improvement loess through mixer, makes Its moisture content is transported at construction, is filled, compacting operation close to after the ground loess optimum moisture content;Often fill out 20cm-25cm thickness Degree compacting is extremely not less than 95% compactness;It is improved in loess in dirt and is laid with the one layer of first two-way soil of polypropylene every 0.2 meter Work grid 6-1;It is laid with the first drainpipe 7-1 of polypropylene material in dirt improvement loess top, the first upper ends drainpipe 7-1 will Connect with reinforced polypropylene drainage module 3, lower end will connect with gutter 9, the first drainpipe 7-1 is with the slope not less than 4 ‰ Rate;It after compacting, carries out an acceptance inspection, non-compliant substrate is handled;
(2) the first composite geo-membrane 4-1 is directly laid in above dirt improvement loess, breadth is selected to be more than the first of 1m Composite geo-membrane 4-1, to reduce connector materials.Connector uses gluing, the wide 50mm of seam.Between first composite geo-membrane 4-1 and It to flatten and be adjacent between first composite geo-membrane 4-1 and basic 8 faces, but the first composite geo-membrane 4-1 should not be tightened too much, no It can there are bubbles at the first bottoms composite geo-membrane 4-1.Ensure that the first composite geo-membrane 4-1 cannot be damaged.First composite earthwork Film 4-1 will brush the emulsified asphalt of thick 2mm with peripheral structure object using expansion bolt and steel plate press strip anchor connection, connecting portion Bonding, to prevent being leaked at this;
Step 4, wall are constructed:
(1) reinforcement cushion 5 is built by laying bricks or stones:By loess and dirt according to 7:3 weight ratio adds water to carry out mix shape through mixer Loess is improved at dirt, so that the formation dirt after mix is improved loess rate close to after the ground loess optimum moisture content, is transported to At construction, according to slope masonry, compacting;It is improved in dirt and is laid with the two-way geotechnological lattice of one layer of second polypropylene in loess every 0.2 meter Grid 6-2;It builds the gradient by laying bricks or stones and is not less than 1:0.275;10cm thickness is often filled out to tamp to the compactness not less than 95%;Dirt improves loess It is interior every 0.5m build polypropylene material the second drainpipe 7-2, and with 3 phase of reinforced polypropylene drainage module in wall It connects;Second drainpipe 7-2 a diameter of 100mm, the second drainpipe 7-2 with not less than 4 ‰ ratio of slope along far from slope surface direction to Lower inclination;It after compacting, carries out an acceptance inspection, non-compliant reinforcement cushion is handled;
The laying of (2) second composite geo-membrane 4-2:Second composite geo-membrane 4-2 is directly laid on reinforcement cushion 5, Breadth is selected to be more than 1m as possible, to reduce connector materials.Connector uses gluing, the wide 50mm of seam.Between second composite geo-membrane 4-2 And second will flatten between composite geo-membrane 4-2 and reinforcement cushion 5 and be adjacent to, but reinforcement cushion 5 should not be tightened too much, Bu Neng There are bubbles at reinforcement cushion 5 bottom.Ensure that reinforcement cushion 5 cannot be damaged.Second composite geo-membrane 4-2 is used with peripheral structure object Expansion bolt and steel plate press strip anchor connection, connecting portion will brush the emulsified asphalt bonding of thick 2mm, to prevent being oozed at this Leakage;
(3) polypropylene drainage module 3 is laid with:3 scene of polypropylene drainage module is subjected to module splicing, is assembled into case After be layed on the second combined earthwork partition film 4-2, and with basis 8 in the first drainpipe 7-1 and reinforcement cushion 5 in second row Water pipe 7-2 connects;
(4) laying of long filament geotextiles 2:Long filament geotextiles 2 are directly laid in polypropylene by the way of artificial rolling paving In drainage module 3, cloth cover wants smooth, and suitably there are distortion allowances, and the installation of long filament geotextiles 2 is using the method welded. The width of welding is generally 0.1m or more, and long filament geotextiles 2 are connected with peripheral structure object using expansion bolt and the anchoring of steel plate press strip It connects, connecting portion will brush the emulsified asphalt bonding of thick 2mm, to prevent being leaked at this;
(5) honeycomb geotechnical grid 1 is built by laying bricks or stones:Honeycomb geotechnical grid 1 is deployed in long filament geotextiles 2, stretches smooth-going, tightly Patch sub-layer long filament geotextiles 2 are paved, and ensure to be in good stress after load applies;It is used in combination a diameter of Φ 8U steel bars to follow closely Vertical slope surface is directly fixed in reinforcement cushion 5, and steel nail is 1m along slope surface spacing and level interval.Inside honeycomb geotechnique lattice 1 Placement in layers gravelly soil, and tamp to the compactness for being not less than 95%, and plant flowers and plants in gravelly soil and form vegetable layer;
Step 5, gutter 9 are built by laying bricks or stones:Gutter is constructed below wall, 9 section of gutter is rectangle, is suitable for side Top of the slope portion intercepts water, and 9 bottom initial depth of gutter is 50cm, and wide 40cm, flow is pressed in 9 bottom of gutter with the ratio of slope not less than 0.5% Direction drawdown.To prevent from seeping water, the dirt that 15cm thickness is laid at 9 bottom of gutter improves loess as bed course, is grouted using M10 MU30 slabstones are built by laying bricks or stones, and 9 inner bottom surface of gutter and side are smeared to form coating with M10 mortars, coating layer thickness 20mm, and should be set Set expansion joint.
Honeycomb geotechnical grid retaining wall provided by the invention with ecological recovery function, successively by high-strength polyethylene material Expect honeycomb geotechnical grid, long filament geotextiles, reinforced polypropylene drainage module, composite geo-membrane, reinforcement cushion structure, lower part base Plinth be reinforcement dirt improve loess, reinforcement material be polypropylene direction earthwork grille, basis in build polypropylene drainpipe and on End connects with reinforced polypropylene drainage module, and lower end connects with the gutter in wall corner, with compound between basis and wall Geomembrane is separated by, to prevent top rain infiltration to infrastructure.The high-strength polyethylene material honeycomb geotechnical grid conduct on top Retaining wall retaining structure, bearing capacity and dynamic performance are higher, and antiskid, erosion resistance are strong, inside can fill suitable improvement Gravelly soil constitutes the structure with powerful laterally limiting and big stiffness, and plants vegetation in gravelly soil and prevent erosion simultaneously With the effect of beautifying the environment, honeycomb structure has good drainage performance;Long filament geotextiles have good as filter layer Hydraulics and anti-filter condition, and reinforced polypropylene drainage module collective effect play water storage function, effectively store rain Water provides irrigation resource for top vegetable layer, reaches the comprehensive utilization of rainwater;When rainwater storage is more than accumulation, enhancing is poly- Propylene drainage module forms internal drainage channel with the composite geo-membrane with good barrier effect, passes through the side of flat drainage Formula excludes superfluous water rainwater, to achieve the effect that control rainwater yielding flow;Reinforcement cushion uses the two-way geotechnique of polypropylene Grid improves back shearing resistance, the compression strength of bed course as reinforcement material.The honeycomb geotechnical grid retaining wall fills broken with inside Stone soil constitutes the structure with powerful laterally limiting and big stiffness, compares traditional mortar flag stone retaining wall, retaining wall of the present invention Easy to connect, speed of application is fast, and cost is relatively low, and cost-saved 50%, meanwhile, internal vegetable layer and lower part drainage module Common slope protection system of the structure with ecological functions, has the function of beautifying the environment, and realize the effect of the comprehensive utilization of rainwater Fruit eliminates influence of the precipitation to retaining wall, to reach effective combination of ecological recovery and engineering control.

Claims (9)

1. a kind of construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function, it is characterised in that:The earth-retaining Wall includes the basis (8) of setting on the ground, and wall of the setting on basic (8), and the basis (8) is led between wall It crosses the first composite geo-membrane (4-1) to separate, the wall includes the reinforcement cushion (5) being laid on successively in slope surface, second compound Geomembrane (4-2), reinforced polypropylene drainage module (3), long filament geotextiles (2) and honeycomb geotechnical grid (1);The basis (8) include dirt improvement loess and the first polypropylene direction earthwork grille (6-1) being arranged in dirt improvement loess, the One drainpipe (7-1), first drainpipe (7-1) are connected with reinforced polypropylene drainage module (3);The reinforcement cushion (5) include dirt improvement loess and the second polypropylene direction earthwork grille (6-2) being arranged in dirt improvement loess, the Two drainpipes (7-2), second drainpipe (7-2) are also connected with reinforced polypropylene drainage module (3);
The construction method of the retaining wall includes the following steps:
Preparation and slope leveling before step 1, construction;
The excavation of step 2, slope surface and foundation pit:Slope surface excavates the gradient and is less than or equal to 1:0.275, the slope surface after excavation is repaiied It is whole, leveling compacting is carried out to bottom of foundation ditch loess after excavation of foundation pit, compacting factor is greater than or equal to 0.93;
Step 3, basic (8) are constructed, including
1) by loess and dirt according to 7:3 weight ratio adds water to carry out mix formation dirt improvement loess through mixer, makes dirt The yellow soil's water content of improvement is transported at construction, is filled, compacting operation close to after the ground loess optimum moisture content;Often fill out The dirt improvement loess of 20cm-25cm thickness is tamped to the compactness not less than 95%;It is improved in loess every 0.2 meter in dirt It is laid with the first polypropylene direction earthwork grille (6-1), the first drainpipe (7-1), first row are laid in dirt improvement loess top The water pipe upper end (7-1) will connect with the reinforced polypropylene drainage module (3) in wall, lower end will connect with gutter (9), the One drainpipe (7-1) is tilted down with the ratio of slope not less than 4 ‰ along the direction far from slope surface;
2) first composite geo-membrane (4-1) of the breadth more than 1m is selected to be laid in above dirt improvement loess, connector uses gluing, It flattens between first composite geo-membrane (4-1) and between the first composite geo-membrane (4-1) and basic (8) and is adjacent to, the first composite earth Expansion bolt and steel plate press strip anchor connection, connecting portion brushing emulsified asphalt are used between work film (4-1) and peripheral structure object Bonding;
Step 4, wall are constructed, including
1) reinforcement cushion (5) are built by laying bricks or stones:By loess and dirt according to 7:3 weight ratio adds water progress mix to form ash through mixer The good loess of land reform, is transported at construction, according to slope masonry, compacting;It is improved in loess in dirt and is laid with the second polypropylene every 0.2 meter Direction earthwork grille (6-2) builds the gradient by laying bricks or stones and is not less than 1:0.275;The dirt improvement loess for often filling out 10cm thickness is tamped to not small In 95% compactness;Dirt is improved in loess is arranged the second drainpipe (7-2) every 0.5m, and the second drainpipe (7-2) is not with Ratio of slope less than 4 ‰ is tilted down along the direction far from slope surface;One end of second drainpipe (7-2) is contacted with slope surface, the other end It will connect with the reinforced polypropylene drainage module (3) in wall;
2) laying of the second composite geo-membrane (4-2):Second composite geo-membrane (4-2) is directly laid on reinforcement cushion (5), The breadth of second composite geo-membrane (4-2) is more than 1m, and connector uses gluing, and between the second composite geo-membrane (4-2) and second is multiple It closes to flatten between geomembrane (4-2) and reinforcement cushion (5) and be adjacent to, the second composite geo-membrane (4-2) is used with peripheral structure object Expansion bolt and steel plate press strip anchor connection, connecting portion brushing emulsified asphalt bonding;
3) polypropylene drainage module (3) is laid with:Polypropylene drainage module (3) scene is spliced, case is assembled into, is laid with In on the second composite geo-membrane (4-2), and with the second row in the first drainpipe (7-1) and reinforcement cushion (5) in basic (8) Water pipe (7-2) connects;
4) laying of long filament geotextiles (2):Long filament geotextiles (2) are laid in polypropylene drainage by the way of artificial rolling paving In module (3), cloth cover is smooth, and suitably there are distortion allowance, and long filament geotextiles are welded between (2), long filament geotextiles (2) and week Side works uses expansion bolt and steel plate press strip anchor connection, connecting portion brushing emulsified asphalt bonding;
5) honeycomb geotechnical grid (1) is built by laying bricks or stones:Honeycomb geotechnical grid (1) is deployed in long filament geotextiles (2), smooth-going is stretched, It is close to sub-layer long filament geotextiles (2) to pave, is used in combination reinforcing bar to follow closely vertical slope surface and is fixed in reinforcement cushion (5), honeycomb geotechnique's lattice Gravelly soil is filled in room (1), and is tamped to the compactness for being not less than 95%, and flowers and plants are planted in gravelly soil and form vegetable layer;
Step 5, gutter( 9)Build by laying bricks or stones.
2. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is:The side-lower of the wall is equipped with gutter (9), and first drainpipe (7-1) is built in basic (8) internal upper part, institute The first drainpipe (7-1) is stated to tilt down along the direction far from slope surface with the ratio of slope not less than 4 ‰, the first drainpipe (7-1) Upper end connects with reinforced polypropylene drainage module (3), lower end and gutter (9) are connected.
3. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is:The honeycomb geotechnical grid (1) is the three-dimensional netted cell compartment welded by high-strength polyethylene material and formed, the honeycomb It is the gravelly soil filled in geotechnical grid (1), the gravelly soil is equipped with the vegetable layer formed by planting flowers and plants.
4. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is:The long filament geotextiles (2) are by polyester filament networking and three-dimensional structure made of consolidating.
5. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is:The reinforced polypropylene drainage module (3) is the reticular structure made of regenerated environment protecting high-strength polypropylene material, bottom Portion is three-dimensional composite drainage network;The reinforced polypropylene drainage module (3) is multiple and is assembled into case to be layed in second compound On geomembrane (4-2).
6. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is:The compacting factor of the dirt improvement loess is greater than or equal to 0.95;The first polypropylene direction earthwork grille (6-1) It is that the multiple and horizontal dirt that is layed in is improved in loess with the second polypropylene direction earthwork grille (6-2), adjacent first is poly- The distance between propylene direction earthwork grille (6-1) is 0.2m, between the second adjacent polypropylene direction earthwork grille (6-2) Distance is also 0.2m.
7. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is:Second drainpipe (7-2) is multiple and is tilted down and set along the direction far from slope surface with the ratio of slope not less than 4 ‰ It sets, the distance between adjacent described second drainpipe (7-2) is 0.5m, and one end of second drainpipe (7-2) and enhancing are poly- Propylene drainage module (3) connects, and the other end is inserted into slope surface.
8. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is, first composite geo-membrane (4-1) and the second composite geo-membrane (4-2) are high-density polyethylene material, thickness 1.25mm。
9. the construction method of the honeycomb geotechnical grid retaining wall with ecological recovery function as described in claim 1, feature It is, the first polypropylene direction earthwork grille (6-1) and the second polypropylene direction earthwork grille (6-2) are to use high intensity Reinforced earth is made, per linear meter(lin.m.) tensile yield power:Longitudinal 45KN/m, lateral 45KN/m;Per linear meter(lin.m.) yield elongation rate:It is longitudinal 16%, lateral 13%.
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CN109763502A (en) * 2019-01-25 2019-05-17 西北大学 A kind of environmentally protective comprehensive processing method of high steep Loess Landslide
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