CN106351239A - Cement modified soil strengthened geogrid reinforced soil structure and construction method thereof - Google Patents
Cement modified soil strengthened geogrid reinforced soil structure and construction method thereof Download PDFInfo
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- CN106351239A CN106351239A CN201610963648.8A CN201610963648A CN106351239A CN 106351239 A CN106351239 A CN 106351239A CN 201610963648 A CN201610963648 A CN 201610963648A CN 106351239 A CN106351239 A CN 106351239A
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- soil
- modified cement
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- cement soil
- slope
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
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- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a cement modified soil strengthened geogrid reinforced soil structure and a construction method thereof. The cement modified soil strengthened geogrid reinforced soil structure (shown in a figure 1) is composed of four parts including a base layer (1) and a cover layer (9) composed of cement modified soil, a water drainage layer (2) and a cement modified soil strengthened geogrid reinforced soil layer thereof, and is a novel geogrid reinforced soil structure which is formed by improving similar structures through utilizing good properties including solidification, high wetting resistance, high anti-scouring and flood damage resisting properties, high shearing strength and the like of cement modified soil. Compared with an existing similar structure, the novel geogrid reinforced soil structure and the construction method thereof, provided by the invention, can realize panel-free construction of an abrupt-slope reinforced soil structure, and can also remarkably improve the wetting resistance, anti-scouring property and whole shearing strength of the geogrid reinforced soil structure; the cement modified soil strengthened geogrid reinforced soil structure is especially suitable for protecting and reinforcing edge slopes, which are easy to scour and damage by flood, of abrupt-slope sections.
Description
Technical field
The present invention relates to a kind of geogrids reinforced earth structure, especially relate to a kind of modified cement soil strengthening geotechnique
Geogrid Reinforced Soil structure, the invention still further relates to the construction method of this modified cement soil strengthening geogrids reinforced earth structure.
Background technology
In recent years, highway and hydraulic engineering scientific worker, by transforming to traditional geogrids reinforced earth structure
And it is applied to reinforcing and the improvement of special soils (especially swelled ground) side slope, achieve original project benefit and technological achievement.
But the geogrids reinforced earth knot due to existing Novel geogrid earth structure such as flexible supporting structure, inside and outside bilateral parcel
Structure etc. cannot be by Fill Reinforced With Geogrids effect counteracting because the humidifying of fill stratum, softening be overall to geogrids reinforced earth structure strong
The reduction of degree, especially cannot offset the humidifying because of filler, soften between the GSZ that causes and the soil body interface intensity drastically
Existing geogrids reinforced earth structure therefore, at present, also cannot be used for China directly by the use of such soil as filler by decay
The argillaceous sandstone residual soil side slope of southern damp-heat area steep slope region, the washing away of granite residual soil side slope, damaged or destroyed by flood class are destroyed
Administer.At present, both at home and abroad to less economical schemes such as anchored frame girder constructions conventional in the reinforcement technique of such side slope, also do not have
There is the scheme finding a kind of technically reliable, economical rationality.
Reason of both mainly the having of above-mentioned side slope damage by water: on the one hand, easily wash away, the Moisture Damage such as damaged or destroyed by flood broken
Bad slope soil is often based on no-Co-alloy steel, and the cohesiveness of soil is very low, and the soil body has in larger in native state and rubs
Wipe angle, but once after meeting water saturation because be scattered in a small amount of cohesive soil of the soil body be softened and cause native internal friction angle drastically under
Fall is so that the saturation shearing strength of soil is close to weak soil；On the other hand, the washing away and damage by water, often caused by heavy rain of abrupt slope
Period surface water directly washes away or quickly infiltrates entrance side slope superficial layer soil body by surface water, causes the top layer soil body to be quickly saturated
Induction superficial saturation soil layer slip destructions of collapsing, wash away with shallow-layer saturated soil slip collapse destroy promote mutually further, result in side
Slope can occur large-scale damage by water after a torrential rain.Therefore, by rising to geogrids reinforced earth technology
How level transformation, overcome the geogrids reinforced earth structure being formed with such native filler to be readily able to be washed shortcoming with damaged or destroyed by flood,
Enable geogrids reinforced earth in such native steep slope road section application, the improvement side of a kind of technically reliable, economical rationality will be found
Case.
Content of the invention
Technical problem underlying to be solved by this invention is to develop a kind of Novel geogrid earth structure, with significantly
Improve erosion resistibility and the humidifying intensity of platform and domatic top layer reinforcement soil layer it is ensured that domatic top layer GSZ and soil body circle
The shearing strength in face remains to meet the local stability of abrupt slope geogrids reinforced earth structure after humidifying and stability in the large will
Ask, thus geogrids reinforced earth structure is promoted the use of the abrupt slope position easily washing away damaged or destroyed by flood side slope, adding for such side slope
Gu providing a kind of construct quick, technically reliable, the new method of economical rationality with administering.
The characteristic such as high, not easy to crack for the intensity of granite residual soil modified cement soil and Fill Reinforced With Geogrids are tied by the present invention
Structure construction is simple, the characteristic of good integrity combines (Fig. 1), by arranging modified cement soil padding 1 and cap rock 9, using cement
The high characteristic of Modified soil bad hydraulic permeability, good integrity, shearing strength, has greatly reinforced the platform of geogrids reinforced earth structure
Erosion resistibility, moisture-resisting ability and water shutoff ability；The present invention utilizes curability and the high-strength characteristic of modified cement soil, leads to
Cross thin layer cement Modified soil and the GSZ of upper and lower two-layer solidify to form overall, an i.e. modified cement soil solidification linkage section 7,
This not only can replace pitman guarantees the connection of upper and lower two-layer GSZ moreover it is possible to greatly improve GSZ and soil body interface
Frictional strength, thus greatly improving the integral anti-shearing intensity of geogrids reinforced earth structure；The present invention also by each plus
Muscle soil layer leans on domatic end to arrange a modified cement soil block, i.e. modified cement soil block 6, and this not only can greatly improve GSZ
The domatic antiscour damaged or destroyed by flood ability of earth structure, impermeabilisation ability are moreover it is possible to raising geogrids reinforced earth structure side slope is domatic
Intensity and the humidifying and the softening that avoid its internal soil body, more can replace panel, realize the no panel construction of abrupt slope reinforced earth, greatly
Simplify greatly the working procedure of abrupt slope earth structure, reduce difficulty of construction and old of construction；Patent of the present invention passes through setting
Enable to infiltrate rainwater by row in the modified cement soil padding 1 of geogrids reinforced earth structural base and drainage blanket 2 thereon
Water layer 2 sends earth's surface, and bottom solum causes strength retrogression it is ensured that GSZ because the impermeable role of bed course 1 avoids humidifying
Earth structure has a foundation steady in a long-term；Patent of the present invention is also by being arranged on geogrids reinforced earth structure
The modified cement earth mulch layer 9 at top and be located at domatic modified cement soil block 6 to ensure that geogrids reinforced earth structure has anti-
Wash away the ability with water shutoff.
Novel geogrid earth structure and its construction method and existing homogeneous structure ratio that the present invention provides, except can be real
Moreover it is possible to significantly improve the moisture-resisting of geogrids reinforced earth structure, antiscour outside the no panel construction of existing abrupt slope earth structure
With integral anti-shearing intensity, it is particularly suited for the reinforcing that steep slope section easily washes away damaged or destroyed by flood side slope.
Brief description
Fig. 1 is a kind of drawing of the check dam structure of use Fill Reinforced With Geogrids modified cement soil clad.Fig. 2 is to apply this
Declare the structure of patent and construction method wide Buddhist start carry out in the coombe of highway Deqing granite slope collapse section abrupt slope domatic
The Specific construction example repaired.
Specific embodiment
Below in conjunction with the accompanying drawings 1 and wide Buddhist start highway Deqing granite slope collapse section coombe abrupt slope domatic reparation should
Specific construction example, the invention will be further described.
Referring to Fig. 1, constructed as follows:
1) press earth structure to design width 11 and add the width range excavation of 1m outside side slope, cutting depth is not less than
0.5m；
2) element soil filler is sprinkled water to soft plastic state, than the ratio for 8%, cement is uniformly spilt in the weight of cement and wet soil
On the earth material after watering, carry out road mix construction with excavator, hard plastic state is in by the good modified cement soil of road mix and is defined；
3) road mix modified cement soil is laid on excavation area bottom, virtual resurfacing thickness is about 70cm, is compacted using excavator,
Compacting counting is no less than 6 times, and thickness should ensure that no more than 50cm, and this compacting modified cement soil layer is bed course 1；
4) build a slope drainage ditch 10 in the outer end of bed course 1；
5) design, by earth structure, the metalling that width paves a layer 0.6, after compacting, thickness is not less than 0.5m, repaiies slope, paves
When should reserve the platform 3 that falls；
6) choose the earth grille (ultimate tensile strength is not less than 80kn/m) of 6m fabric width, press design width for every piece
Plus the length of 2.5m cut standby；
7) by the single sheet cutting fiber earthwork grid from excavation line by laterally being laid always to line of slope outward by inner,
And remainder is spooled be placed at side slope surface；
8) press step 7) toward longitudinally remaining each single sheet fiber earthwork grid of laying until whole excavation area is by glass fibre soil
Work grid completely spreads, and notes ensureing that between every two pieces of earth grille, tower spreading degree is not less than 0.5m；
9) leave a blank after domatic 0.5m, by the empty paving of 70cm thickness wet element soil filler, be compacted using excavator, compacting counting is not
Less than 6 times, compacted depth is about 50cm；
10) press step 2) road mix modified cement soil earth material, and filled up the area of leaving a blank of step 9) to line of slope, and reserved part
Road mix modified cement soil earth material；
11) it is placed on spooling the earth grille at side slope surface to strain, paves on fill stratum after anti-package, being used in combination
The domatic position of excavator backhand carries out repairing slope, to ensure that ratio of slope and earth grille major part all have been inserted into modified cement
In soil, also just complete the construction of modified cement soil block 6；
12) the road mix cement reserved by step 10) of a layer thickness 5cm is laid on the earth grille on fill stratum
Modified soil earth material；
13) by step 7)～8) complete last layer earth grille, the slope that notes keeping to the side is layered on cement Modified soil
On earth grille wood cylinder roll to earth grille substantially embed modified cement native in, also just complete
The construction of the modified cement soil solidification linkage section 7 of levels GSZ 4；
14) by step 9)～13) complete the construction that remaining modified cement soil strengthens geogrids reinforced earth layer；
15) with reference to step 2)～3) construction of cap rock 9 is completed at the top of earth structure.
In July, 2016, started highway Deqing granite slope collapse section by originally declaring patented technology and applying in wide Buddhist
The application practice (Fig. 2) of the domatic reparation of abrupt slope coombe shows, originally declares patented technology compared with existing earth structure, except can
Realize outside the no panel construction of abrupt slope earth structure moreover it is possible to significantly improve the moisture-resisting of geogrids reinforced earth structure, anti-impact
Brush and integral anti-shearing intensity, are particularly suited for protection and reinforcing that steep slope section easily washes away damaged or destroyed by flood side slope.
Claims (2)
1. a kind of modified cement soil strengthening geogrids reinforced earth structure (Fig. 1) includes the bed course (1) being become by modified cement local soil type
With cap rock (9), drainage blanket (2) and main body -- modified cement soil strengthening geogrids reinforced earth layer totally 4 part；Modified cement soil
Middle cement mixing content should take weight to compare 8%～15% according to different soil properties respectively；Modified cement soil strengthening geogrids reinforced earth layer bag
Include the parcel section being solidified by modified cement soil block (6) and GSZ (4), the modified cement soil of levels GSZ (4) is consolidated
Change the parcel section of linkage section (7) and GSZ (4) and plain fill (8), wherein, the parcel section width that GSZ (4) solidifies
(5) it is 0.2m～0.5m, the connection width of modified cement soil solidification linkage section (7) of levels GSZ (4) should be greater than
1.5m.
2. the construction method of modified cement soil strengthening geogrids reinforced earth structure (Fig. 1) according to right 1, its step is special
Levying is: 1) designs width (11) by earth structure and adds the width range excavation of 1m outside side slope, cutting depth is not less than
0.5m；2) element soil filler is sprinkled water to soft plastic state, than the ratio for 8%, cement is uniformly spilt in the weight of cement and wet soil
On the earth material after watering, carry out road mix construction with excavator, hard plastic state is in by the good modified cement soil of road mix and is defined；
3) road mix modified cement soil is laid on excavation area bottom, virtual resurfacing thickness is about 70cm, is compacted using excavator, pressure
Real pass is no less than 6 times, and thickness should ensure that no more than 50cm, and this compacting modified cement soil layer is bed course (1)；4) in bed course
(1) a slope drainage ditch (10) is built in outer end；5) metalling that width paves a layer 0.6, pressure are designed by earth structure
After reality, thickness is not less than 0.5m, repaiies slope, should reserve the platform that falls (3) when paving；6) choose the earth grille of 6m fabric width
(ultimate tensile strength be not less than 80kn/m), every piece cut by the length that design width adds 2.5m standby；7) will cut
Single sheet fiber earthwork grid is put from excavation line by laterally being laid to line of slope always outward by inner, and remainder is spooled
At side slope surface；8) press step 7) toward longitudinally remaining each single sheet fiber earthwork grid of laying until whole excavation area is by glass
Glass fiber earthwork grid completely spreads, and notes ensureing that between every two pieces of earth grille, tower spreading degree is not less than 0.5m；9)
Leave a blank after domatic 0.5m, by the empty paving of 70cm thickness wet element soil filler, be compacted using excavator, compacting counting is no less than 6 times,
Compacted depth is about 50cm；10) press step 2) road mix modified cement soil earth material, and it is extremely domatic to be filled up the area of leaving a blank of step 9)
Line, and reserved part road mix modified cement soil earth material；11) it is placed on the earth grille at side slope surface to draw by spooling
Tightly, pave on fill stratum after anti-package, and carry out repairing slope with the domatic position of excavator backhand, to ensure ratio of slope and glass fibre soil
Work grid major part all has been inserted into, in modified cement soil, also just completing the construction of modified cement soil block (6)；12) in fill stratum
On earth grille on laying a layer thickness 5cm reserved by step 10) road mix modified cement soil earth material；13)
By step 7)～8) complete last layer earth grille, note glass slope of keeping to the side being layered on cement Modified soil
Fiber earthwork grid wood cylinder rolls and substantially embeds in modified cement soil to earth grille, also just completes levels
The construction of modified cement soil solidification linkage section (7) of GSZ (4)；14) by step 9)～13) complete remaining modified cement soil
The construction of strengthening geogrids reinforced earth layer；15) with reference to step 2)～3) complete applying of cap rock (9) at the top of earth structure
Work.
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| CN201610963648.8A CN106351239B (en) | 2016-10-28 | 2016-10-28 | A kind of modified cement soil strengthens geogrids reinforced earth structure and its construction method |
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| CN201610963648.8A CN106351239B (en) | 2016-10-28 | 2016-10-28 | A kind of modified cement soil strengthens geogrids reinforced earth structure and its construction method |
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| CN106351239B CN106351239B (en) | 2018-11-27 |
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Cited By (7)
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| CN106917388A (en) * | 2017-03-14 | 2017-07-04 | 广东省长大公路工程有限公司 | The check dam and construction method of a kind of use Fill Reinforced With Geogrids modified cement soil clad |
| CN107315082A (en) * | 2017-07-24 | 2017-11-03 | 武汉理工大学 | A kind of many depression door model assay systems of three-dimensional array type |
| CN109537389A (en) * | 2018-12-11 | 2019-03-29 | 长沙理工大学 | Embankment structure and its construction method under a kind of EPS |
| CN109610502A (en) * | 2018-12-11 | 2019-04-12 | 长沙理工大学 | A kind of construction method of dark formula Modified soil long and short anchor arm |
| CN109763513A (en) * | 2018-12-11 | 2019-05-17 | 长沙理工大学 | A kind of anchor cable lattice and the compound retaining structure of Modified soil retaining wall and its construction method |
| CN112177037A (en) * | 2019-07-03 | 2021-01-05 | 长沙理工大学 | Reinforced solidified soil retaining wall structure and construction method thereof |
| CN114703875A (en) * | 2022-04-20 | 2022-07-05 | 长沙理工大学 | High-steep artificial slope wave-shaped reinforced retaining structure and construction method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917388A (en) * | 2017-03-14 | 2017-07-04 | 广东省长大公路工程有限公司 | The check dam and construction method of a kind of use Fill Reinforced With Geogrids modified cement soil clad |
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| CN107315082B (en) * | 2017-07-24 | 2024-05-24 | 武汉理工大学 | Three-dimensional array type multi-sinking door model test system |
| CN109537389A (en) * | 2018-12-11 | 2019-03-29 | 长沙理工大学 | Embankment structure and its construction method under a kind of EPS |
| CN109610502A (en) * | 2018-12-11 | 2019-04-12 | 长沙理工大学 | A kind of construction method of dark formula Modified soil long and short anchor arm |
| CN109763513A (en) * | 2018-12-11 | 2019-05-17 | 长沙理工大学 | A kind of anchor cable lattice and the compound retaining structure of Modified soil retaining wall and its construction method |
| CN109537389B (en) * | 2018-12-11 | 2021-01-05 | 长沙理工大学 | EPS (expandable polystyrene) lower embankment structure and construction method thereof |
| CN112177037A (en) * | 2019-07-03 | 2021-01-05 | 长沙理工大学 | Reinforced solidified soil retaining wall structure and construction method thereof |
| CN112177037B (en) * | 2019-07-03 | 2023-03-17 | 长沙理工大学 | Construction method of reinforced solidified soil retaining wall |
| CN114703875A (en) * | 2022-04-20 | 2022-07-05 | 长沙理工大学 | High-steep artificial slope wave-shaped reinforced retaining structure and construction method thereof |
| CN114703875B (en) * | 2022-04-20 | 2024-02-23 | 长沙理工大学 | High-steep artificial side slope wavy reinforced soil retaining structure and construction method thereof |
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| CN106351239B (en) | 2018-11-27 |
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Effective date of registration: 20190506 Address after: 410000 Sixth Floor, Industrial Building, Changsha University of Technology, 45 Chiling Road, Tianxin District, Changsha City, Hunan Province Patentee after: Hunan Huada Engineering Co.,Ltd. Address before: 410114 No. 2, 960 Wan Li Li South Road, Yuhua District, Changsha, Hunan Patentee before: CHANGSHA University OF SCIENCE AND TECHNOLOGY |
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Address after: F13, Building 001, No. 649, Yuanda 1st Road, Furong District, Changsha City, Hunan Province, 410000 Patentee after: Hunan Expressway Huada Engineering Co.,Ltd. Address before: 410000 Sixth Floor, Industrial Building, Changsha University of Technology, 45 Chiling Road, Tianxin District, Changsha City, Hunan Province Patentee before: Hunan Huada Engineering Co.,Ltd. |