CN103882884B - A kind of anchor cable geo-grid retaining structure and construction method thereof - Google Patents

A kind of anchor cable geo-grid retaining structure and construction method thereof Download PDF

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CN103882884B
CN103882884B CN201410058061.3A CN201410058061A CN103882884B CN 103882884 B CN103882884 B CN 103882884B CN 201410058061 A CN201410058061 A CN 201410058061A CN 103882884 B CN103882884 B CN 103882884B
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grid
slope
compacting
anchor cable
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CN103882884A (en
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刘龙武
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Hainan traffic planning, investigation, design and Research Institute
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Changsha University of Science and Technology
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Abstract

The invention discloses a kind of anchor cable geo-grid retaining structure and construction method thereof, this retaining structure (1) arranges Slope with multi-step; Single-stage slope structure is made up of more than 2 basic structural units (4); Single basic structural unit comprises bottom water proof and drainage geogrid parcel reinforcement compacting soil layer and top geo-grid and wraps up reinforcement compacting soil layer; A plant biological bag is placed at the keep to the side position on slope of each geo-grid parcel reinforcement compacting soil layer; Side, slope of keeping to the side bottom every grade of side slope arranges an anchor cable, and is connected with the geo-grid that the geo-grid of bottom is wrapped up in reinforcement compacting soil layer inside slope of keeping to the side; The top of top one-level point supporting system is provided with top Waterproof structural course; On slope, table is provided with land drainage facility, comprises bottom discharge ditch, platform gutter and top catchwater.The present invention is specially adapted to the reparation of damage by water side slope or the retaining structure as decomposed rock and soil cutting side slope.

Description

A kind of anchor cable geo-grid retaining structure and construction method thereof
Technical field
The present invention relates to a kind of highway cutting slope supporting and safeguard structure, particularly relate to a kind of anchor cable geo-grid retaining structure, the invention still further relates to the construction method of this anchor cable geo-grid retaining structure.
Background technology
A kind of flexible reinforcement retaining structure and construction method (Chinese patent thereof, open (bulletin) number: CN100464034, publication date: on February 25th, 2009) point supporting system that provides of this invention has following architectural feature: be pervious foundation layer at the bottom of retaining structure, between retaining structure and excavation face, have pervious layer, this pervious layer and pervious foundation layer are integrated; Under pervious foundation layer, excavation has sewer; In whole retaining structure, lay muscle material, the muscle material of every layer all exceedes the width of retaining structure, and anti-package to last layer, and is connected with the muscle material of last layer, the earthen backfill compacting of excavating of every layers of reinforcement material.This structure is particularly suitable for expansive soil.Because design ratio of slope that this structure is suitable is everlasting the width designs such as 1:1.5 or 1:1.75, employing, structure width often can be controlled in 4m.When the cut slope this structure being applied to mountain area decomposed rock or soil property abrupt slope is reinforced, sometimes taken over the land for use or the restriction such as surface feature, building, require to maintain cut slope ratio of slope at more than 1:0.5.When at this moment the filler in this structure will be applied expansive soil and other baliki, because filler shear strength is low, more than ratio of slope 1:0.5 is difficult to meet design safety requirement.For improving the resistance to overturning of former flexible reinforcement retaining structure body local shear strength and retaining structure, unidirectional for former geo-grid anti-package connection is become two-way anti-package and connects with the local stability of the globality and retaining structure that strengthen flexible reinforcement retaining structure body by the present invention, adopt by arranging the rebar element body structure with guarded drainage performance, the guarded drainage layer arranged in each block construction be used for getting rid of behind slope infiltrate the underground water guaranteeing of rainwater and different depth fill expansive soil wherein or and other baliki be in unsaturated state, with the local stability of the shear strength and retaining structure that improve compacting filler further, set up horizontal cable to improve the holistic arrestment slippage stabilization of reinforced retaining structures in the bottom of every grade of flexible reinforcement retaining structure simultaneously.By above improvement, make flexible reinforcement retaining structure can not only be used for the abrupt slope design in expansive soil section, more make flexible reinforcement retaining structure can adopt baliki or other clay filling, therefore greatly can expand the scope of application of reinforced retaining structures in cut slope field of reinforcement.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of anchor cable geo-grid retaining structure being suitable for decomposed rock that ratio of slope is more than 1:0.5 or soil road slope reinforcement.
Second technical problem to be solved by this invention is to provide a kind of construction method of anchor cable geo-grid retaining structure.
In order to solve above-mentioned first technical problem, anchor cable geo-grid retaining structure provided by the invention, by Slope with multi-step Structure composing, single-stage slope structure is superposed by least 2 basic structural units and forms, single described basic structural unit comprises bottom water proof and drainage geogrid parcel reinforcement compacting soil layer and top geo-grid and wraps up reinforcement compacting soil layer two parts, and the outside left wrapping up the slope of keeping to the side of reinforcement compacting soil layer and top geo-grid parcel reinforcement compacting soil layer at each described bottom water proof and drainage geogrid is placed with a plant biological bag; Be provided with anchor cable inside the slope of keeping to the side of the bottom of the single-stage slope structure described in every grade, described anchor cable and described bottom water proof and the drainage geogrid geo-grid of wrapping up in reinforcement compacting soil layer inside slope of keeping to the side is connected and is anchored in the natural slope soil body; The top of the single-stage slope structure described in the superiors is provided with top Waterproof structural course; The top of the single-stage slope structure described in top is provided with top Waterproof structural course; On slope, table is provided with land drainage facility.
Described bottom water proof and drainage geogrid parcel reinforcement compacting soil layer by bottom anti-seepage geotextile, be placed in the gravelly soil drainage blanket on described anti-seepage geotextile, the flexible porous tube arranged inside side slope, the compacting unsaturated soil be placed on described gravelly soil drainage blanket form, and connect after two-way for geo-grid anti-package with pitman, form the reinforcement compacting soil layer wrapped up by geo-grid; Described top geo-grid parcel reinforcement compacting soil layer is that the geo-grid of being laid by tunneling boring is after " U " sprig is fixed, the upper berth unsaturation soil body compaction in layers, then it will be formed by connecting with pitman on two-way for geo-grid anti-package to the layered soil of compacting.
Described top Waterproof structural course is made up of anti-seepage geotextile and the loam layer of planting be placed on anti-seepage geotextile.
Described land drainage facility comprises bottom discharge ditch, platform gutter and top catchwater.
In order to solve above-mentioned second technical problem, the invention provides the construction method realizing anchor cable geo-grid retaining structure, its step is as follows:
(1), the basic structural unit of the bottom of every grade of anchor cable geo-grid retaining structure is constructed according to the following steps:
1. according to designing requirement, in the bottom position boring of every grade of reinforcement supporting and protection structure, anchor cable is installed;
2. excavate, after to Reinforced Earth Retaining Structure, lay first floor geo-grid, the length needed for reserved two-way anti-package to connection, lays one deck waterproof geotextiles after " U " sprig is fixed in described geo-grid;
3. be placed with flexible porous tube in the bottom by natural slope side being equipped with described waterproof geotextiles and fill one deck gravelly soil;
4. anchor cable is connected with geo-grid;
5. the saturated clays occurred in damage by water or the domatic soil body that do not come down is removed, selection unsaturated soil is wherein as filler, empty paving 30cm is thick, first compacting layering is formed with excavator (fuselage quality more than 2500 kilograms) crawler belt compacting more than 6 times, then use excavator (fuselage quality more than 2500 kilograms) crawler belt compacting more than 6 times to form second compacting layering equally with unsaturated soil void paving 30cm is thick again, two compacting layerings define a compacting soil layer;
6. lean on the position of slope table to pile up in the bottom being equipped with described waterproof geotextiles and plant immature soil bag;
7. by geo-grid two-way anti-package connecting with pitman on two compacting layerings;
8. 2. lay and fixing geo-grid by step;
9. by step 5. compacting form layered soil and pile up plant immature soil bag in the position by slope table;
10. 7. two-way for geo-grid anti-package is connected by step;
(2) basic structural unit on the top of every grade of, described anchor cable geo-grid retaining structure by polycrystalline substance unit construction sequence 2. ~ 3. and 5. ~ 10. construct;
(3), complete described anchor cable geo-grid retaining structure first order prop after, reserve position of platform, carry out by step the construction that 1 ~ 2 carries out the second level and third level prop;
(4), after the prop construction that completes whole described anchor cable geo-grid retaining structure, top shield body is laid one deck anti-seepage geotextile, and on anti-seepage geotextile, fills one deck plant loam layer, the top Waterproof structural course described in formation;
(5) construction of bottom discharge ditch, platform gutter and top catchwater, is finally carried out at slope table.
Adopt the anchor cable geo-grid retaining structure of technique scheme and construction method thereof, the invention provides a kind of can with baliki or other clay filling and the anchor cable geogrid-reinforced earth structures of steep slope road section (ratio of slope > 1:0.5) highway cutting slope reinforcement can be used for.It is the technological improvement to a kind of flexible reinforcement retaining structure and construction method (Chinese patent, open (bulletin) number: CN100464034, publication date: on February 25th, 2009) thereof.Former flexible reinforcement retaining structure can not be used for the cut slope reinforcing that ratio of slope is greater than 1:0.5, unidirectional for former geo-grid anti-package connection is become two-way anti-package and connects with the globality and the local stability that strengthen flexible reinforcement retaining structure body by the present invention, by arranging the rebar element body structure with guarded drainage performance, guarantee to fill expansive soil wherein or and other baliki be in unsaturated state, to improve shear strength and the local stability of compacting filler further, set up horizontal cable to improve the holistic arrestment slippage stabilization of reinforced retaining structures in the bottom of every grade of flexible reinforcement retaining structure simultaneously.By above improvement, make flexible reinforcement retaining structure can not only be used for the abrupt slope design in expansive soil section, more make flexible reinforcement retaining structure can adopt baliki or other clay filling, therefore greatly can expand the scope of application of reinforced retaining structures in cut slope field of reinforcement.
Anchor cable geo-grid retaining structure provided by the invention and construction method thereof, have compared with mortar flag stone retaining wall that cost is lower slightly, speed of application is fast, working security is good, and the advantage that the feature of environmental protection is good, compared with conventional geogrid reinforced retaining wall structure, because its filler of conventional geogrid reinforced retaining wall need adopt sandy soil to fill, when the reinforcing of the road slope to Weathering-residual clay or general clay soil property, because filler can not be gathered materials on the spot the clay adopted in side slope, clay in discarded side slope and strange land excavation sandy soil all can cause soil erosion, cause environmental disruption, and add construction cost, and the unsaturated soil that the present invention can select to have occurred in damage by water (slip and collapse) or the domatic soil body of excavation that do not come down (comprises residual clay, high liquid limit clay etc.) as filler, fill compacting with excavator to form low degree of compaction soil layer and namely can be used as reinforced earth body, adopt excavator to fill compacting and not only save compacting equipment and construction cost, also speed of application is substantially increased, therefore, it is lower slightly that anchor cable geo-grid retaining structure provided by the invention also has cost compared with general geogrid reinforced retaining wall structure, speed of application is fast, working security is good, and the advantage that the feature of environmental protection is good.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
See Fig. 1, anchor cable geo-grid retaining structure provided by the invention, retaining structure 1 by Slope with multi-step Structure composing namely by top one-level point supporting system 3 and at least one-level edge slope structure 2 form, each edge slope structure 2 is superposed by multiple basic structural unit 4 and forms, single basic structural unit 4 comprises bottom water proof and drainage geogrid parcel reinforcement compacting soil layer 5 and top geo-grid and wraps up reinforcement compacting soil layer 6 two parts, the outside left on the slope of keeping to the side of portion's water proof and drainage geogrid parcel reinforcement compacting soil layer 5 and top geo-grid parcel reinforcement compacting soil layer 6 is placed with a plant biological bag 7 in each of the lower, inside the slope of keeping to the side of the bottom of every grade of single-stage slope structure, be provided with anchor cable 8, anchor cable 8 and bottom water proof and the drainage geogrid geo-grid of wrapping up in reinforcement compacting soil layer 5 inside slope of keeping to the side is connected and is anchored in the natural slope soil body, the top of the top one-level point supporting system 3 of the superiors is provided with top Waterproof structural course 9, on slope, table is provided with land drainage facility, and land drainage facility comprises bottom discharge ditch 21, platform gutter 20 and top catchwater 22.
Bottom water proof and drainage geogrid parcel reinforcement compacting soil layer 5 by bottom anti-seepage geotextile 10, be placed in the permeable geotextiles drainage blanket 11 on described anti-seepage geotextile 10, the flexible porous tube 12 arranged inside side slope, the compacting unsaturated soil 13 be placed on permeable geotextiles drainage blanket 11 form, and after the two-way anti-package of geo-grid is connected with pitman, defines the reinforcement compacting soil layer wrapped up by geo-grid 14; Top geo-grid parcel reinforcement compacting soil layer 6 is fixed through " U " sprig 15 by full face geo-grid 14, wraps up the compacting layering of reinforcement with geo-grid two-way anti-package unsaturation layered soil 16 by the geo-grid 14 that pitman is connected to form.
Top Waterproof structural course 9 is made up of anti-seepage geotextile 18, the loam layer 19 of planting be placed on anti-seepage geotextile 18.
The construction method realizing anchor cable geo-grid retaining structure provided by the invention, step is as follows:
1. the basic structural unit 4 of the bottom of every grade of anchor cable geo-grid retaining structure can be constructed according to the following steps:
See Fig. 1,1. according to designing requirement, in the bottom position boring of every grade of reinforcement supporting and protection structure, anchor cable 8 is installed; 2. excavate, after to Reinforced Earth Retaining Structure, lay first floor geo-grid 14, geo-grid 14 reserves the length needed for two-way anti-package to connection, after " U " sprig 15 is fixing, lay one deck waterproof geotextiles 10 in geo-grid 14; 3. flexible porous tube 12 and permeable geotextiles drainage blanket 11 is placed with in the bottom by natural slope side being equipped with waterproof geotextiles 10; 4. anchor cable 8 is connected with geo-grid 14; 5. the saturated clays occurred in damage by water (slip and collapse) or the domatic soil body that do not come down is removed, selection unsaturated soil (comprising residual clay, high liquid limit clay etc.) is wherein as filler, empty paving 30cm is thick, first compacting layering is formed with excavator (fuselage quality more than 2500 kilograms) crawler belt compacting more than 6 times, then use excavator (fuselage quality more than 2500 kilograms) crawler belt compacting more than 6 times to form second compacting layering equally with unsaturated soil void paving 30cm is thick again, two compacting layerings define soil layer (13); 6. lean on the position of slope table to pile up in the bottom being equipped with waterproof geotextiles 10 and plant immature soil bag 7; 7. by geo-grid 14 two-way anti-package connecting with pitman on compacting unsaturated soil 13; 8. 2. lay and fixing geo-grid 14 by step; 9. by step 5. compacting form layered soil 16 and pile up plant immature soil bag 7 in the position by slope table; 10. 7. two-way for geo-grid 14 anti-package is connected by step.
2. the top of every grade of anchor cable geo-grid retaining structure basic structural unit 4 by polycrystalline substance unit construction sequence 2. ~ 3. and 5. ~ 10. construct.
3., after completing anchor cable geo-grid retaining structure first order prop, reserve position of platform, carry out by step the construction that 1 ~ 2 carries out the second level and third level prop;
4., after completing the prop construction of whole anchor cable geo-grid retaining structure, top shield body is laid one deck anti-seepage geotextile 18, and on anti-seepage geotextile 18, fills one deck plant loam layer 19, which forms top Waterproof structural course 9.
5. the construction of bottom discharge ditch 21, platform gutter 20 and top catchwater 22 is finally carried out at slope table.
Adopt anchor cable geo-grid retaining structure and the construction method thereof of technique scheme, to a kind of flexible reinforcement retaining structure and construction method (Chinese patent thereof, open (bulletin) number: CN100464034, publication date: on February 25th, 2009) technological improvement.Former flexible reinforcement retaining structure can not be used for the cut slope reinforcing that ratio of slope is greater than 1:0.5, unidirectional for former geo-grid anti-package connection is become two-way anti-package and connects with the globality and the local stability that strengthen flexible reinforcement retaining structure body by the present invention, adopt by arranging the rebar element body structure with guarded drainage performance, guarantee to fill expansive soil wherein or and other baliki be in unsaturated state, to improve shear strength and the local stability of compacting filler further, set up horizontal cable to improve the holistic arrestment slippage stabilization of reinforced retaining structures in the bottom of every grade of flexible reinforcement retaining structure simultaneously.By above improvement, make flexible reinforcement retaining structure can not only be used for the abrupt slope design in expansive soil section, more make flexible reinforcement retaining structure can adopt baliki or other clay filling, therefore greatly can extend the scope of application of reinforced retaining structures in cut slope field of reinforcement.
At present, the reinforcing being the Weathering-residual clay of more than 1:0.5 or the road slope of general clay soil property for ratio of slope often adopts mortar flag stone retaining wall structure or conventional geogrid reinforced retaining wall structure to design.Because mortar flag stone retaining wall speed of application is slow, working security is poor and not easily afforest, therefore, anchor cable geo-grid retaining structure provided by the invention and construction method thereof, have compared with mortar flag stone retaining wall that cost is lower slightly, speed of application is fast, working security is good, and the advantage that the feature of environmental protection is good, compared with conventional geogrid reinforced retaining wall structure, because its filler of conventional geogrid reinforced retaining wall need adopt sandy soil to fill, when the reinforcing of the road slope to Weathering-residual clay or general clay soil property, because filler can not be gathered materials on the spot the clay adopted in side slope, clay in discarded side slope and strange land excavation sandy soil all can cause soil erosion, cause environmental disruption, and add construction cost, and the unsaturated soil that the present invention can select reinforcing side slope has occurred in damage by water (slip and collapse) or the domatic soil body that do not come down (comprises residual clay, high liquid limit clay etc.) as filler, namely reinforced earth body is can be used as after compacting, therefore, anchor cable geo-grid retaining structure provided by the invention is compared with general geogrid reinforced retaining wall structure, also there is cost lower slightly, speed of application is fast, working security is good, and the advantage that the feature of environmental protection is good.

Claims (4)

1. an anchor cable geo-grid retaining structure, by Slope with multi-step Structure composing, single-stage slope structure is superposed by least 2 basic structural units (4) and forms, single described basic structural unit (4) comprises bottom water proof and drainage geogrid parcel reinforcement compacting soil layer (5) and top geo-grid and wraps up reinforcement compacting soil layer (6) two parts, the outside left wrapping up the slope of keeping to the side of reinforcement compacting soil layer (5) and top geo-grid parcel reinforcement compacting soil layer (6) at each described bottom water proof and drainage geogrid is placed with a plant biological bag (7), be provided with anchor cable (8) inside the slope of keeping to the side of the bottom of the single-stage slope structure described in every grade, described anchor cable (8) and described bottom water proof and the drainage geogrid geo-grid of wrapping up in reinforcement compacting soil layer (5) inside slope of keeping to the side is connected and is anchored in the natural slope soil body, the top of the single-stage slope structure described in the superiors is provided with top Waterproof structural course (9), on slope, table is provided with land drainage facility, it is characterized in that: described bottom water proof and drainage geogrid parcel reinforcement compacting soil layer (5) are by the anti-seepage geotextile of bottom (10), be placed in the permeable geotextiles drainage blanket (11) on described anti-seepage geotextile (10), the flexible porous tube (12) arranged inside side slope, be placed in compacting unsaturated soil (13) composition on described permeable geotextiles drainage blanket (11), and geo-grid is the earth grille of the bituminous coating of fabric width 6 meters, geo-grid needs two-way anti-package and connects with pitman, form the reinforcement compacting soil layer wrapped up by geo-grid (14), described top geo-grid parcel reinforcement compacting soil layer (6) is fixed through " U " sprig (15) by full face geo-grid (14), with geo-grid formation by unsaturated soil compacting layered soil (16) two-way anti-package and after connecting with pitman.
2. anchor cable geo-grid retaining structure according to claim 1, is characterized in that: described top Waterproof structural course (9) is made up of anti-seepage geotextile (18), the loam layer (19) of planting be placed on anti-seepage geotextile (18).
3. anchor cable geo-grid retaining structure according to claim 1 and 2, is characterized in that: described land drainage facility comprises bottom discharge ditch (21), platform gutter (20) and top catchwater (22).
4. realize the construction method of anchor cable geo-grid retaining structure according to claim 1, its steps characteristic is:
(1), the basic structural unit (4) of the bottom of every grade of anchor cable geo-grid retaining structure is constructed according to the following steps:
1. according to designing requirement, in the bottom position boring of every grade of reinforcement supporting and protection structure, anchor cable (8) is installed;
2. excavate, after to Reinforced Earth Retaining Structure, lay first floor geo-grid (14), length needed for reserved two-way anti-package to connection, above lays one deck waterproof geotextiles (10) in described geo-grid (14) after " U " sprig (15) is fixing;
3. be placed with flexible porous tube (12) in the bottom by natural slope side being equipped with described waterproof geotextiles (10) and lay the permeable geotextiles of one deck (11);
4. anchor cable (8) is connected with geo-grid (14);
5. the saturated clays occurred in damage by water or the domatic soil body that do not come down is removed, selection unsaturated soil is wherein as filler, empty paving 30cm is thick, first compacting layering is formed with the crawler of excavator compacting more than 6 times of fuselage quality more than 2500 kilograms, form second compacting layering with the crawler of excavator compacting more than 6 times of the thick same fuselage quality more than 2500 kilograms of unsaturated soil void paving 30cm again, two compacting layerings define soil layer (13);
6. lean on the position of slope table to pile up in the bottom being equipped with described waterproof geotextiles (10) and plant immature soil bag (7);
7. by geo-grid (14) two-way anti-package connecting with pitman on compacting soil layer (13);
8. 2. lay by step and fixing geo-grid (14);
9. by step 5. compacting form layered soil (16) and pile up plant immature soil bag (7) in the position by slope table;
10. 7. geo-grid (14) two-way anti-package is connected by step;
(2) basic structural unit (4) on the top of every grade of, described anchor cable geo-grid retaining structure by polycrystalline substance unit construction sequence 2. ~ 3. and 5. ~ 10. construct;
(3), complete described anchor cable geo-grid retaining structure first order prop (2) after, reserve position of platform, carry out by step the construction that 1 ~ 2 carries out the second level and third level prop;
(4) after, completing the prop construction of whole described anchor cable geo-grid retaining structure, top shield body is laid one deck anti-seepage geotextile (18), and on anti-seepage geotextile (18), fill one deck plant loam layer (19), the top Waterproof structural course (9) described in formation;
(5) construction of bottom discharge ditch (21), platform gutter (20) and top catchwater (22), is finally carried out at slope table.
CN201410058061.3A 2014-02-20 2014-02-20 A kind of anchor cable geo-grid retaining structure and construction method thereof Active CN103882884B (en)

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