CN106351239B - A kind of modified cement soil strengthens geogrids reinforced earth structure and its construction method - Google Patents
A kind of modified cement soil strengthens geogrids reinforced earth structure and its construction method Download PDFInfo
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- CN106351239B CN106351239B CN201610963648.8A CN201610963648A CN106351239B CN 106351239 B CN106351239 B CN 106351239B CN 201610963648 A CN201610963648 A CN 201610963648A CN 106351239 B CN106351239 B CN 106351239B
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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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Abstract
The invention discloses a kind of modified cement soil to strengthen geogrids reinforced earth structure and its construction method.A kind of modified cement soil strengthen geogrids reinforced earth structure include by modified cement local soil type at bed course 1 and cap rock 9, drainage blanket 2 and its modified cement soil strengthen geogrids reinforced earth layer totally 4 part, be a kind of to wash away the Novel geogrid earth structure that the superperformances such as damaged or destroyed by flood and high shear strength improve homogeneous structure and formed using the curable of modified cement soil, highly resistance humidifying, highly resistance.Novel geogrid earth structure provided by the invention and its construction method and existing homogeneous structure ratio, in addition to achievable abrupt slope earth structure is without panel construction, the moisture-resistant, antiscour and integral anti-shearing intensity that geogrids reinforced earth structure can also be significantly improved, the protection and reinforcing of damaged or destroyed by flood side slope are easily washed away particularly suitable for steep slope section.
Description
Technical field
The present invention relates to a kind of geogrids reinforced earth structures, especially relate to a kind of modified cement soil reinforcing geotechnique
Geogrid Reinforced Soil structure, the invention further relates to the construction methods that the modified cement soil strengthens geogrids reinforced earth structure.
Background technique
In recent years, highway and hydraulic engineering scientific worker, by being transformed to traditional geogrids reinforced earth structure
And it is applied to the reinforcing and improvement of special soils (especially swelled ground) side slope, achieve original project benefit and technological achievement.
But due to the geogrids reinforced earth knot of existing Novel geogrid earth structure such as flexible supporting structure, inside and outside bilateral package
Structure etc. can not act on counteracting because the humidifying of fill stratum, softening are integrally strong to geogrids reinforced earth structure by Fill Reinforced With Geogrids
The reduction of degree can not especially offset the humidifying because of filler, intensity is sharply between TGXG and soil body interface caused by softening
Decaying, therefore, currently, also existing geogrids reinforced earth structure can not be used for China directly using such soil as filler
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 is destroyed
It administers.Currently, not having also to the less economical schemes such as anchored frame girder construction are commonly used in the reinforcement technique of such side slope both at home and abroad
There is the scheme for finding a kind of technically reliable, economical rationality.
Above-mentioned side slope damage by water mainly has both sides reason：On the one hand, easily wash away, the Moisture Damages such as damaged or destroyed by flood it is broken
Bad slope soil is often based on no-Co-alloy steel, and native cohesiveness is very low, and the soil body has in biggish in native state to rub
Wipe angle, but after meeting water saturation because a small amount of cohesive soil for being scattered in the soil body is softened cause native internal friction angle sharply under
Drop, so that the saturation shearing strength of soil is close to weak soil；On the other hand, abrupt slope wash away and damage by water, often caused by heavy rain
Period surface water is directly washed away or is quickly infiltrated by surface water into side slope superficial layer soil body, and the surface layer soil body is caused quickly to be saturated
It induces superficial saturation soil layer and slips destructions of collapsing, wash away and slip to collapse and destroy further promotion mutually with shallow-layer saturated soil, result in side
Large-scale damage by water can occur after a torrential rain for slope.Therefore, by being risen to geogrids reinforced earth technology
How grade transformation overcomes and is readily able to be washed with the geogrids reinforced earth structure that such native filler is formed and the shortcomings that damaged or destroyed by flood,
Enable geogrids reinforced earth in the steep slope road section application of such soil, the improvement side of a kind of technically reliable, economical rationality will be found
Case.
Summary of the invention
Technical problem underlying to be solved by this invention is to develop a kind of Novel geogrid earth structure, with substantially
Improve the erosion resistibility and humidifying intensity of platform and slope surface surface layer reinforcement soil layer, it is ensured that slope surface surface layer TGXG and soil body circle
The shearing strength in face is still able to satisfy the local stability of steep land soil work Geogrid Reinforced Soil structure after humidifying and overall stability is wanted
It asks, is adding for such side slope so that geogrids reinforced earth structure to be promoted the use of to the abrupt slope position for easily washing away damaged or destroyed by flood side slope
Gu providing the new method of a kind of quick construction, technically reliable, economical rationality with administering.
The present invention characteristics such as high, not easy to crack and Fill Reinforced With Geogrids knot by the intensity of granite residual soil modified cement soil
Structure construction is simple, good integrity characteristic combines (Fig. 1), by the way that modified cement soil padding 1 is arranged in bottom and sets at top
Cap rock 9 is set, using the high characteristic of modified cement soil bad hydraulic permeability, good integrity, shearing strength, TGXG has been greatly reinforced and has added
Erosion resistibility, moisture-resistant ability and the water shutoff ability of the platform of muscle soil structure；The present invention is curable using modified cement soil
Property and high-strength characteristic, upper and lower two layers of TGXG is formed by curing to one whole, i.e. setting water by thin layer cement Modified soil
Mud Modified soil solidifies linkage section, this can not only replace pitman to ensure the connection of upper and lower two layers of TGXG, moreover it is possible to greatly improve
The frictional strength of TGXG and soil body interface, to greatly improve the integral anti-shearing intensity of geogrids reinforced earth structure；This
Invention also by each reinforcement soil layer by slope surface end be arranged a modified cement soil block, i.e., setting modified cement soil block 6, this
Antiscour damaged or destroyed by flood ability, the impermeabilisation ability of geogrids reinforced earth structure slope surface can not only be greatly improved, moreover it is possible to improve geotechnique
The intensity of Geogrid Reinforced Soil structure side slope slope surface and the humidifying and softening for avoiding its internal soil body, can more replace panel, realize steep
Constructing without panel for slope reinforced earth, enormously simplifies the working procedure of abrupt slope earth structure, reduces difficulty of construction and construction
Chen Ben；The invention patent passes through the modified cement soil padding 1 that geogrids reinforced earth structural base is arranged in and draining thereon
Layer 2, which enables, infiltrates rainwater by the discharge earth's surface of drainage blanket 2, caused by bottom solum avoids humidifying because of the impermeable role of bed course 1
Strength retrogression, it is ensured that geogrids reinforced earth structure has a foundation steady in a long-term；The invention patent also passes through
The modified cement earth mulch layer 9 that geogrids reinforced earth structural top is arranged in and the modified cement soil block 6 for being located at slope surface ensure
Geogrids reinforced earth structure has the ability of antiscour and water shutoff.
Novel geogrid earth structure provided by the invention and its construction method and existing homogeneous structure ratio, removing can be real
Constructing without panel for existing abrupt slope earth structure is outer, moreover it is possible to significantly improve moisture-resistant, the antiscour of geogrids reinforced earth structure
With integral anti-shearing intensity, the reinforcing of damaged or destroyed by flood side slope is easily washed away particularly suitable for steep slope section.
Detailed description of the invention
Fig. 1 is a kind of drawing for strengthening geogrids reinforced earth structure with modified cement soil.Fig. 2 is special using originally declaring
The structure and construction method of benefit are started in wide Buddhist carries out slope surface reparation in the coombe of highway Deqing granite slope collapse section abrupt slope
Specific construction example.
Specific embodiment
It 1 and is answered with reference to the accompanying drawing in the slope surface reparation that wide Buddhist starts highway Deqing granite slope collapse section coombe abrupt slope
Specific construction example, the invention will be further described.
A kind of modified cement soil strengthens geogrids reinforced earth structure, including by modified cement local soil type at be located at the knot
The bed course 1 of structure bottom and the cap rock 9 positioned at the structural top, the drainage blanket 2 on bed course 1 and it is located under cap rock 9
The main body that forms of geogrids reinforced earth layer totally 4 parts are strengthened by modified cement soil on drainage blanket 2；In modified cement soil
Cement mixing content should take respectively weight ratio 8%~15% according to different soil properties；Modified cement soil strengthens geogrids reinforced earth layer packet
The surface for including the modified cement soil block 6 being made of away from slope surface 0.5m range flood modified cement soil solidifies geotechnique through modified cement soil
It wraps up section, changed by 8 surface of plain fill through 5cm solid cement positioned at the range away from slope surface 0.5m to 1.5m in the outside formed after grid 4
Property the cured upper layer and lower layer overlapping part of soil TGXG 4 and the middle part linkage section 7 that is formed and positioned at away from slope surface 1.5m to opening
Wrap up section in the inside in digging face.Referring to Fig. 1, a kind of modified cement soil strengthens the concrete construction method of geogrids reinforced earth structure,
Its steps characteristic is：
1) width being designed by earth structure and the width range for adding 1m outside side slope excavating, cutting depth is not less than
0.5m；
2) plain native filler is sprinkled water to soft plastic state, the ratio for being 8% in the weight ratio of cement and wet soil is equal by cement
On the even earth material being sprinkled upon after sprinkling water, road mix construction is carried out with excavator, hard plastic state is in the good modified cement soil of road mix
Subject to；
3) road mix modified cement soil being laid on excavation area bottom, virtual resurfacing thickness 70cm is compacted using excavator,
Compacting counting is no less than 6 times, and thickness should ensure that no more than 50cm, which is bed course 1；
4) a slope drainage ditch 10 is built in the outer end of bed course 1；
5) it paving the metalling of one layer of 0.6m by earth structure design width, thickness is not less than 0.5m after compacting, slope is repaired,
The platform 3 that falls should be reserved when paving；
6) earth grille of 6m breadth of the ultimate tensile strength not less than 80kN/m is chosen, it is every piece wide by design
The length of degree plus 2.5m cut spare；
7) the single sheet fiber earthwork grid cut is laid with always outward by inner to slope surface from excavation line by transverse direction
Line, and rest part is spooled and is placed at side slope surface；
8) remaining each single sheet fiber earthwork grid is laid with until entire excavation area is by glass fibers toward longitudinal by step 7)
Dimension TGXG is completely spread, and notices guaranteeing that tower spreading degree is not less than 0.5m between every two pieces of earth grilles；
9) it after slope surface of leaving a blank 0.5m, by the native filler of the wet element of 70cm thickness void paving, is compacted using excavator, compacting counting
No less than 6 times, compacted thickness 50cm；
10) step 2) road mix modified cement soil earth material is pressed, and is filled up the area of leaving a blank of step 9) to line of slope, and reserve
Part road mix modified cement soil earth material；
11) earth grille that is placed at side slope surface will be spooled to tense, paved after anti-package on fill stratum, and
It carries out repairing slope with excavator backhand slope surface position, be changed with guaranteeing that ratio of slope and earth grille largely all have been inserted into cement
Property soil in, and pay attention to guaranteeing that the cured package section width 5 of TGXG 4 for 0.5m, also just completes applying for modified cement soil block 6
Work；
12) road mix of a layer thickness 5cm reserved by step 10) is laid in the earth grille on fill stratum
Modified cement soil earth material；
13) by step 7)~8) upper layer of glass TGXG is completed, pay attention to that modified cement soil will be layered on by side slope
On earth grille rolled with the wooden cylinder to earth grille be embedded in substantially modified cement it is native in；
14) step 9)~13 are pressed) complete the construction that remaining modified cement soil strengthens geogrids reinforced earth layer；
15) referring to step 2~3) in the construction of the top of earth structure completion cap rock 9.
Start highway Deqing granite slope collapse section in wide Buddhist by will originally declare patented technology and apply in July, 2016
The application practice (Fig. 2) of the slope surface reparation of abrupt slope coombe shows originally to declare patented technology compared with existing earth structure, and removing can
Realize the outer without panel construction of abrupt slope earth structure, moreover it is possible to significantly improve moisture-resistant, the anti-impact of geogrids reinforced earth structure
Brush and integral anti-shearing intensity, the protection and reinforcing of damaged or destroyed by flood side slope are easily washed away particularly suitable for steep slope section.
Claims (2)
1. a kind of modified cement soil strengthens geogrids reinforced earth structure, it is characterised in that：Including by modified cement local soil type at
Bed course (1) positioned at the structural base and the cap rock (9) positioned at the structural top, the drainage blanket on bed course (1)
(2) main body that geogrids reinforced earth layer forms is strengthened by modified cement soil and on drainage blanket (2) under cap rock (9)
Totally 4 parts；Cement mixing content should take respectively weight ratio 8%~15% according to different soil properties in modified cement soil；Modified cement soil
Strengthening geogrids reinforced earth layer includes the modified cement soil block (6) being made of away from slope surface 0.5m range flood modified cement soil
Wrap up section, positioned at the range away from slope surface 0.5m to 1.5m in the outside that surface is formed after modified cement soil solidifies TGXG (4)
In being formed by TGXG (4) of plain fill (8) surface through the cured upper layer and lower layer overlapping part of 5cm solid cement Modified soil
Portion's linkage section (7) and positioned at away from slope surface 1.5m to excavation face inside wrap up section.
2. a kind of modified cement soil described in claim 1 strengthens the construction method of geogrids reinforced earth structure, feature step
Suddenly it is：
1) width being designed by earth structure and the width range for adding 1m outside side slope excavating, cutting depth is not less than 0.5m；
2) plain native filler is sprinkled water to soft plastic state, uniformly spills cement in the ratio that the weight ratio of cement and wet soil is 8%
On earth material after watering, road mix construction is carried out with excavator, the good modified cement soil of road mix of being subject to is in hard plastic state；
3) road mix modified cement soil is laid on excavation area bottom, virtual resurfacing thickness 70cm is compacted using excavator, compacting
Pass is no less than 6 times, and thickness should ensure that no more than 50cm, which is bed course (1)；
4) a slope drainage ditch (10) is built in the outer end of bed course (1)；
5) it paves the metalling of one layer of 0.6m thickness by earth structure design width, thickness is not less than 0.5m after compacting, repairs slope, booth
The platform that falls (3) should be reserved when paving；
6) every piece of earth grille for choosing 6m breadth of the ultimate tensile strength not less than 80kN/m is added by design width
The length of 2.5m cuts spare；
7) the single sheet fiber earthwork grid cut is laid with always to line of slope by transverse direction by inner outward from excavation line, and
Rest part is spooled and is placed at side slope surface；
8) remaining each single sheet fiber earthwork grid is laid with until entire excavation area is by glass fibre soil toward longitudinal by step 7)
Work grid is completely spread, and notices guaranteeing that tower spreading degree is not less than 0.5m between every two pieces of earth grilles；
9) it after slope surface of leaving a blank 0.5m, by the native filler of the wet element of 70cm thickness void paving, is compacted using excavator, compacting counting is many
In 6 times, compacted thickness 50cm；
10) step 2) road mix modified cement soil earth material is pressed, and is 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) earth grille that is placed at side slope surface will be spooled to tense, paved after anti-package on fill stratum, and with digging
Pick machine backhand slope surface position carries out repairing slope, to guarantee that ratio of slope and earth grille largely all have been inserted into modified cement soil
In, also just complete the construction of modified cement soil block (6)；
12) the road mix cement of a layer thickness 5cm reserved by step 10) is laid in the earth grille on fill stratum
Modified soil earth material；
13) by step 7)~8) upper layer of glass TGXG is completed, pay attention to be layered on modified cement soil by side slope
Earth grille is rolled with the wooden cylinder into earth grille insertion modified cement soil；
14) step 9)~13 are pressed) complete the construction that remaining modified cement soil strengthens geogrids reinforced earth layer；
15) referring to step 2~3) in the construction of the top of earth structure completion cap rock (9).
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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 |
| CN107315082B (en) * | 2017-07-24 | 2024-05-24 | 武汉理工大学 | Three-dimensional array type multi-sinking door model test system |
| CN109610502B (en) * | 2018-12-11 | 2020-12-01 | 长沙理工大学 | Construction method of concealed modified soil anti-slip retaining wall |
| CN109763513B (en) * | 2018-12-11 | 2021-04-20 | 长沙理工大学 | Construction method of anchor cable lattice and modified soil retaining wall composite supporting and retaining structure |
| CN109537389B (en) * | 2018-12-11 | 2021-01-05 | 长沙理工大学 | EPS (expandable polystyrene) lower embankment 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 |
| 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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| US7850402B1 (en) * | 2007-05-17 | 2010-12-14 | Henry Justiniano | Cement-treated soil blocks with vegetative faces |
| CN101851928B (en) * | 2010-06-08 | 2011-06-29 | 中国科学院地质与地球物理研究所 | Method for improving and protecting collapsible loess slope project |
| CN101892675B (en) * | 2010-06-29 | 2012-04-25 | 长安大学 | Flexible retaining wall with rigid support |
| CN103088834B (en) * | 2013-02-01 | 2014-11-12 | 河海大学 | Method for improving slope stability of expansive soil and controlling structural damage of expansive soil |
| CN104818658B (en) * | 2015-05-13 | 2017-01-18 | 山西省交通科学研究院 | Road widening method for collapsible yellow earth foundation layer |
| CN105625444A (en) * | 2016-03-14 | 2016-06-01 | 攀枝花学院 | Impermeable surface layer structure for soil slope |
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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. |