CN109024532A - A kind of subgrade in salty soil zone is actively every salt construction method - Google Patents
A kind of subgrade in salty soil zone is actively every salt construction method Download PDFInfo
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- CN109024532A CN109024532A CN201810927232.XA CN201810927232A CN109024532A CN 109024532 A CN109024532 A CN 109024532A CN 201810927232 A CN201810927232 A CN 201810927232A CN 109024532 A CN109024532 A CN 109024532A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/12—Back-filling of foundation trenches or ditches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
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Abstract
The present invention relates to roadbed construction fields in civil engineering, more particularly to a kind of subgrade in salty soil zone actively every salt construction method.Block stone of the invention, rock ballast, which fill, middle forms larger hole, and this layer of these holes of lower part are exactly lower layer's salinity, the expansion of the soil body, contraction offer certain space, this layer of top will not be risen to by making the destructiveness of lower layer, and the straight-through extraneous dry windy air of these subtle holes, underground vapor is external via being expelled directly out herein, so that roadbed is integrally chronically at dry environment, not will form water content accumulating point, it is therefore prevented that the aggregation and dissolved of readily soluble salt.And the hole on this layer of top is filled up by the mountain flour that the mountain flour and filler itself that roll generation contain, watering rolls hardened formation sealing surface, reserved hole is filled up in the lower part for not only preventing upper layer filler to drop to rock ballast layer, also the skeletal support system that block stone, rock ballast are formed is linked to be entirety, forms stable hardening layer.
Description
Technical field
The present invention relates to roadbed construction fields in civil engineering, more particularly to a kind of subgrade in salty soil zone actively every salt
Construction method.
Background technique
Western China is more serious one of the area of the soil salinization, and soluble-salt is with capillary in saline soil area
The rising of pipe water accumulates in ground surface layer, leads to the universal salification of soil.Salt is swollen to keep subgrade and pavement swelling cracking, road shoulder and side slope loose
It degrades, aggravate frozen bulge and aqueous slurry of road beds, being drastically reduced by subgrade rating when water logging, that sink deformation etc. easily occurs is expendable
Disease determines that the unavailable salinized soil of roadbed fills.
Currently, common subgrade in salty soil zone construction method have cushion, immersion be pre-dissolved method, lowering of watertable method,
With heavy-tamping method etc..However gobi saline soil area nonsaline soil and weak solonchak are distributed few and haul distance generally farther out, lead to cushion
Construction cost is high, influences project progress, and there are problems that spoir stacking, easily influence environment；Gobi saline soil area water simultaneously
Scarcity, immersion are pre-dissolved method and are difficult to carry out；Lowering of watertable method is difficult permanently effective, influences engineering service life；Heavy-tamping method is logical
It crosses destruction original soil structure and mainly solves the problems, such as subgrade rating, very little is influenced on the swollen problem of main salt.Therefore, in gobi salt
How stain soil area carries out Fillers selection and which kind of takes actively every salt measure, guarantee roadbed, road surface entity quality be one urgently
Problem to be solved.
Summary of the invention
Aiming at the problems existing in the prior art, the object of the present invention is to provide a kind of subgrade in salty soil zone actively every salt
Construction method, mainly solves that salt in subgrade in salty soil zone construction is swollen to be made subgrade and pavement bulging, crack, degrade, bursting and become muddy when a thaw sets in, depression etc.
Problem reduces destruction of the salt to the intensity, stability of roadbed, road surface.
To achieve the above object, a kind of subgrade in salty soil zone of the invention provides following skill actively every salt construction method
Art scheme:
A kind of subgrade in salty soil zone includes the following steps: actively every salt construction method
A, prepare before construction
Saline and alkaline plot surface layer bitumen layer is rooted out, sub-layer excavates salt marsh soil layer and forms foundation pit, is compacted foundation pit bottom；
B, cubic meter of stone sorting is abandoned
It is sorted to the cubic meter of stone is abandoned, sub-elects block stone, rock ballast and mountain flour, block stone grain diameter 4.75-33cm, rock ballast partial size 3.75-
4.75cm, mountain flour partial size 3.75cm are hereinafter, abandoning the volume of block stone and rock ballast in the cubic meter of stone is more than 70%；
C, composite geo-membrane uses
Sub-layer bottom of foundation ditch is laid with composite geo-membrane, and composite geo-membrane technical requirements are membrane material thickness 0.30mm, nominally fracture
Intensity >=12.0kN/m, CBR bursting strength >=2.20KN, vertically and horizontally tearing brute force >=0.40 KN, resistance to hydrostatic pressure specified value >=
0.50MPa, peel strength >=6N/cm；
D, foundation pit backfills
Backfill block stone, rock ballast and mountain flour in foundation pit successively backfill block stone, rock ballast and mountain flour and are compacted backfill layer, hole between block stone
It is filled using rock ballast and mountain flour；
E, bitumen layer is laid with
Backfill layer re-lays bitumen layer and completes construction.
In the step A foundation pit depth of fill h > l.5m when, compactness >=93%；Depth of fill 0.8m≤h≤1.5m
When, compactness >=95%；When depth of fill h < 0.8m, compactness >=97%.
It is rolled 5 times in the step A using 50T towed sheep foot roller, land leveller uses 22T halo after flattening surface imperfection nest
Vibrated roller moisturizing rolls 4 times.
Layer is backfilled in the step D and first backfills block stone, rock ballast, is rolled 2 times using 30T padfoot roller, then with 50T towed
Sheep-foot roller rolls 5 times, and surface imperfection nest is filled and led up with mountain flour, sprinkled water, steady using land leveller and roll 3 using 22T smooth-wheeled roller
Time.
The construction water of varieties in saline-alkali areas is purified with water purification equipment in step A, D, and construction water need to meet " coagulation
Native water supply standard " JGJ63-2006 requirement.
Water purification equipment is the La-Ro-30 type water purification of Gansu Prov. Inst. of Membrane Science & Technology's production in step A, D
Equipment.
Rock ballast and the nonuniformity coefficient of mountain flour mixing are 15-20 in the step D.
Saline and alkaline plot is ponding section in the step A, teds earth's surface after the ponding in ponding section is excluded, teds depth
Not less than 50cm.
Returning lift thickness in the step D in foundation pit is more than that 50cm layering is laid with composite geo-membrane, and it is every to return lift thickness
50cm is laid with one layer of composite geo-membrane.
The composite geo-membrane lap of splice is 0.3-0.5m in the step D.
Block stone of the invention, rock ballast fill it is middle form larger hole, and this layer of these holes of lower part be exactly lower layer's salinity,
Offer certain space is shunk in the expansion of the soil body, so that the destructiveness of lower layer is not risen to this layer of top, and these are subtle
The straight-through extraneous dry windy air of hole, underground vapor is external via being expelled directly out herein, is chronically at roadbed integrally
Dry environment not will form water content accumulating point, it is therefore prevented that the aggregation and dissolved of readily soluble salt.And the hole on this layer of top by
The mountain flour that the mountain flour and filler itself for rolling generation contain fills up, and watering rolls hardened formation sealing surface, not only prevents upper layer
Reserved hole is filled up in the lower part that filler drops to rock ballast layer, and the skeletal support system that block stone, rock ballast are formed also is linked to be entirety, shape
At stable hardening layer.
The present invention backfills layer by filling " mountain flour-block stone-rock ballast ", and preventing from forming capillary makes original ground salinity, moisture
Embankment is risen to, solves the problems, such as the leaching of Xin Xiuluji salt.Using the different role of different large-scale rolling apparatus, reasonable combination is protected
Subgrade Compaction Quality has been demonstrate,proved, has solved the problems, such as that backfill layer is not easy compacting and active is insufficient every salt.By being spread in roadbed bottom
If mixing geomembrane forms secondary partition, the problem of road surface is damaged by readily soluble salt is not only solved, composite earthwork is also solved
Film is easy impaired problem.By the recycling to the discarded cubic meter of stone, not only solves construction water and non-, weak solonchak is extremely deficient
Weary problem also protects the ecological environment of saline soil area fragility.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and specific embodiments.
A kind of subgrade in salty soil zone includes the following steps: actively every salt construction method
A, prepare before construction
Saline and alkaline plot surface layer bitumen layer is rooted out, sub-layer 1 excavates salt marsh soil layer and forms foundation pit, is compacted foundation pit bottom；
B, cubic meter of stone sorting is abandoned
It is sorted to the cubic meter of stone is abandoned, sub-elects block stone, rock ballast and mountain flour, block stone grain diameter 4.75-33cm, rock ballast partial size 3.75-
4.75cm, mountain flour partial size 3.75cm are hereinafter, abandoning the volume of block stone and rock ballast in the cubic meter of stone is more than 70%；
C, composite geo-membrane uses
Sub-layer bottom of foundation ditch is laid with composite geo-membrane, and composite geo-membrane technical requirements are membrane material thickness 0.30mm, nominally fracture
Intensity >=12.0kN/m, CBR bursting strength >=2.20KN, vertically and horizontally tearing brute force >=0.40 KN, resistance to hydrostatic pressure specified value >=
0.50MPa, peel strength >=6N/cm；
D, foundation pit backfills
Backfill block stone, rock ballast and mountain flour in foundation pit successively backfill block stone, rock ballast and mountain flour and are compacted backfill layer, 4 holes of block stone
2 are filled using rock ballast 5 and mountain flour 3；
E, bitumen layer is laid with
Backfill layer re-lays bitumen layer and completes construction.
In the step A foundation pit depth of fill h > l.5m when, compactness >=93%；Depth of fill 0.8m≤h≤1.5m
When, compactness >=95%；When depth of fill h < 0.8m, compactness >=97%.
It is rolled 5 times in the step A using 50T towed sheep foot roller, land leveller uses 22T halo after flattening surface imperfection nest
Vibrated roller moisturizing rolls 4 times.Layer is backfilled in the step D and first backfills block stone, rock ballast, rolls 2 using 30T padfoot roller
Time, then rolled 5 times with 50T towed sheep foot roller, surface imperfection nest is filled and led up with mountain flour, is sprinkled water, and use 22T light steady using land leveller
Roller rolls 3 times.
The construction water of varieties in saline-alkali areas is purified with water purification equipment in step A, D, and construction water need to meet " coagulation
Native water supply standard " JGJ63-2006 requirement.Water purification equipment is raw for Gansu Prov. Inst. of Membrane Science & Technology in step A, D
The La-Ro-30 type purifier of production.Rock ballast and the nonuniformity coefficient of mountain flour mixing are 15-20 in the step D.
Saline and alkaline plot is ponding section in the step A, teds earth's surface after the ponding in ponding section is excluded, teds depth
Not less than 50cm.Returning lift thickness in the step D in foundation pit is more than that 50cm layering is laid with composite geo-membrane, and it is every to return lift thickness
50cm is laid with one layer of composite geo-membrane.The composite geo-membrane lap of splice is 0.3-0.5m in the step D.
Embodiment 1
Within saline and alkaline plot backfill layer 50cm, include the following steps:
A, prepare before construction
Saline and alkaline plot surface layer bitumen layer is rooted out, sub-layer excavates salt marsh soil layer and forms foundation pit, is compacted foundation pit bottom；
B, cubic meter of stone sorting is abandoned
It being sorted to the cubic meter of stone is abandoned, sub-elects block stone, rock ballast and mountain flour, block stone grain diameter 4.75-33cm backfills with a thickness of 50cm,
Rock ballast and mountain flour are filled between block stone, rock ballast partial size 3.75-4.75cm, mountain flour partial size 3.75cm are hereinafter, abandon block stone and stone in the cubic meter of stone
The volume of slag is more than 70%；
C, composite geo-membrane uses
Sub-layer bottom of foundation ditch is laid with composite geo-membrane, and composite geo-membrane technical requirements are membrane material thickness 0.30mm, nominally fracture
Intensity >=12.0kN/m, CBR bursting strength >=2.20KN, vertically and horizontally tearing brute force >=0.40 KN, resistance to hydrostatic pressure specified value >=
0.50MPa, peel strength >=6N/cm；
D, foundation pit backfills
Backfill block stone, rock ballast and mountain flour in foundation pit successively backfill block stone, rock ballast and mountain flour and are compacted backfill layer, hole between block stone
It is filled using rock ballast and mountain flour；
E, bitumen layer is laid with
Backfill layer re-lays bitumen layer and completes construction.
In the step A when foundation pit depth of fill h < 0.8m, compactness >=97%.
It is rolled 5 times in the step A using 50T towed sheep foot roller, land leveller uses 22T halo after flattening surface imperfection nest
Vibrated roller moisturizing rolls 4 times.Layer is backfilled in the step D and first backfills block stone, rock ballast, rolls 2 using 30T padfoot roller
Time, then rolled 5 times with 50T towed sheep foot roller, surface imperfection nest is filled and led up with mountain flour, is sprinkled water, and use 22T light steady using land leveller
Roller rolls 3 times.
The construction water of varieties in saline-alkali areas is purified with water purification equipment in step A, D, and construction water need to meet " coagulation
Native water supply standard " JGJ63-2006 requirement.Water purification equipment is raw for Gansu Prov. Inst. of Membrane Science & Technology in step A, D
The La-Ro-30 type purifier of production.
Rock ballast and the nonuniformity coefficient of mountain flour mixing are 15-20 in the step D.Composite geo-membrane is taken in the step D
Spreading degree is 0.3-0.5m.
Embodiment 2
Saline and alkaline plot backfills thickness degree 0.8m≤h≤1.5m, includes the following steps: that a kind of subgrade in salty soil zone is actively applied every salt
Work method, includes the following steps:
A, prepare before construction
Saline and alkaline plot surface layer bitumen layer is rooted out, sub-layer excavates salt marsh soil layer and forms foundation pit, is compacted foundation pit bottom；
B, cubic meter of stone sorting is abandoned
It is sorted to the cubic meter of stone is abandoned, sub-elects block stone, rock ballast and mountain flour, block stone grain diameter 4.75-33cm, rock ballast partial size 3.75-
4.75cm, mountain flour partial size 3.75cm are hereinafter, abandoning the volume of block stone and rock ballast in the cubic meter of stone is more than 70%；
C, composite geo-membrane uses
Sub-layer bottom of foundation ditch is laid with composite geo-membrane, and composite geo-membrane technical requirements are membrane material thickness 0.30mm, nominally fracture
Intensity >=12.0kN/m, CBR bursting strength >=2.20KN, vertically and horizontally tearing brute force >=0.40 KN, resistance to hydrostatic pressure specified value >=
0.50MPa, peel strength >=6N/cm；
D, foundation pit backfills
Backfill block stone, rock ballast and mountain flour in foundation pit successively backfill block stone, rock ballast and mountain flour and are compacted backfill layer, hole between block stone
It is filled using rock ballast and mountain flour；
E, bitumen layer is laid with
Backfill layer re-lays bitumen layer and completes construction.
In the step A when foundation pit depth of fill 0.8m≤h≤1.5m, compactness >=95%；
It is rolled 5 times in the step A using 50T towed sheep foot roller, land leveller is vibrated after flattening surface imperfection nest using 22T halo
Road roller moisturizing rolls 4 times.
Layer is backfilled in the step D and first backfills block stone, rock ballast, is rolled 2 times using 30T padfoot roller, then with 50T towed
Sheep-foot roller rolls 5 times, and surface imperfection nest is filled and led up with mountain flour, sprinkled water, steady using land leveller and roll 3 using 22T smooth-wheeled roller
Time.
The construction water of varieties in saline-alkali areas is purified with water purification equipment in step A, D, and construction water need to meet " coagulation
Native water supply standard " JGJ63-2006 requirement.
Water purification equipment is the La-Ro-30 type water purification of Gansu Prov. Inst. of Membrane Science & Technology's production in step A, D
Equipment.
Rock ballast and the nonuniformity coefficient of mountain flour mixing are 15-20 in the step D.
Saline and alkaline plot is ponding section in the step A, teds earth's surface after the ponding in ponding section is excluded, teds depth
Not less than 50cm.Returning lift thickness in the step D in foundation pit is more than that 50cm layering is laid with composite geo-membrane, and it is every to return lift thickness
50cm is laid with one layer of composite geo-membrane.
Returning lift thickness in the step D in foundation pit is more than that 50cm layering is laid with composite geo-membrane, and it is every to return lift thickness
50cm is laid with one layer of composite geo-membrane.
The composite geo-membrane lap of splice is 0.3-0.5m in the step D.
Embodiment 3
Saline and alkaline plot backfills layer thickness h > 1.5m, includes the following steps: a kind of subgrade in salty soil zone actively every salt construction party
Method includes the following steps:
A, prepare before construction
Saline and alkaline plot surface layer bitumen layer is rooted out, sub-layer excavates salt marsh soil layer and forms foundation pit, is compacted foundation pit bottom；
B, cubic meter of stone sorting is abandoned
It is sorted to the cubic meter of stone is abandoned, sub-elects block stone, rock ballast and mountain flour, block stone grain diameter 4.75-33cm, rock ballast partial size 3.75-
4.75cm, mountain flour partial size 3.75cm are hereinafter, abandoning the volume of block stone and rock ballast in the cubic meter of stone is more than 70%；
C, composite geo-membrane uses
Sub-layer bottom of foundation ditch is laid with composite geo-membrane, and composite geo-membrane technical requirements are membrane material thickness 0.30mm, nominally fracture
Intensity >=12.0kN/m, CBR bursting strength >=2.20KN, vertically and horizontally tearing brute force >=0.40 KN, resistance to hydrostatic pressure specified value >=
0.50MPa, peel strength >=6N/cm；
D, foundation pit backfills
Backfill block stone, rock ballast and mountain flour in foundation pit successively backfill block stone, rock ballast and mountain flour and are compacted backfill layer, hole between block stone
It is filled using rock ballast and mountain flour；
E, bitumen layer is laid with
Backfill layer re-lays bitumen layer and completes construction.
In the step A when foundation pit depth of fill h > 1.5m, compactness >=93%；
It is rolled 5 times in the step A using 50T towed sheep foot roller, land leveller is vibrated after flattening surface imperfection nest using 22T halo
Road roller moisturizing rolls 4 times.
Layer is backfilled in the step D and first backfills block stone, rock ballast, is rolled 2 times using 30T padfoot roller, then with 50T towed
Sheep-foot roller rolls 5 times, and surface imperfection nest is filled and led up with mountain flour, sprinkled water, steady using land leveller and roll 3 using 22T smooth-wheeled roller
Time.
The construction water of varieties in saline-alkali areas is purified with water purification equipment in step A, D, and construction water need to meet " coagulation
Native water supply standard " JGJ63-2006 requirement.
Water purification equipment is the La-Ro-30 type water purification of Gansu Prov. Inst. of Membrane Science & Technology's production in step A, D
Equipment.
Rock ballast and the nonuniformity coefficient of mountain flour mixing are 15-20 in the step D.
Returning lift thickness in the step D in foundation pit is more than that 50cm layering is laid with composite geo-membrane, and it is every to return lift thickness
50cm is laid with one layer of composite geo-membrane.
Returning lift thickness in the step D in foundation pit is more than that 50cm layering is laid with composite geo-membrane, and it is every to return lift thickness
50cm is laid with one layer of composite geo-membrane.
The composite geo-membrane lap of splice is 0.3-0.5m in the step D.
Comparative test
With the experiment contrast as a comparison of embodiment 1, group selection salty area is compareed, laying depth and length are all the same, specific real
Proved recipe method is as shown in the table:
| Control group | Specific Adjusted Option | Using being compared after half a year |
| Embodiment 1 | It constructs referring to 1 step of embodiment | Do not occur subgrade and pavement swelling cracking, road shoulder and side slope and loosely degrades phenomenon |
| Comparative example 1 | Remove block stone | Occur subgrade and pavement swelling cracking, road shoulder and side slope after 1 month and loosely degrades phenomenon |
| Comparative example 2 | Remove rock ballast | Occur subgrade and pavement swelling cracking, road shoulder and side slope after 2 months and loosely degrades phenomenon |
| Comparative example 3 | Remove mountain flour | Occurs subgrade and pavement local dent cracking after 6 months |
| Comparative example 4 | Remove block stone, rock ballast | 1-2 weeks subgrade settlement, encounters rainwater weather or solar exposure occurs loosely degrading phenomenon at once |
| Comparative example 5 | Remove rock ballast, mountain flour | It encounters rainwater weather or solar exposure and occurs local swelling cracking phenomenon at once |
| Comparative example 6 | Remove mountain flour, block stone | When encountering heavy vehicle and passing through, there is local swelling cracking phenomenon |
It can be seen that the present invention by upper table and not only solve the problem of road surface is damaged by readily soluble salt, also solve composite earth
Work film is easy impaired problem.By the recycling to the discarded cubic meter of stone, construction water and non-, weak solonchak are not only solved extremely
Deficient problem, also protects the ecological environment of saline soil area fragility.Especially fill " mountain flour-block stone-rock ballast " backfill layer
Combination, using effect and performance indicator are significantly better than independent or two kinds of combinations.Do not increase construction cost, service life also substantially mentions
It rises.
Claims (10)
1. a kind of subgrade in salty soil zone is actively every salt construction method, it is characterised in that include the following steps:
A, prepare before construction
Saline and alkaline plot surface layer bitumen layer is rooted out, sub-layer (1) excavates salt marsh soil layer and forms foundation pit, is compacted foundation pit bottom；
B, cubic meter of stone sorting is abandoned
It is sorted to the cubic meter of stone is abandoned, sub-elects block stone, rock ballast and mountain flour, block stone grain diameter 4.75-33cm, rock ballast partial size 3.75-
4.75cm, mountain flour partial size 3.75cm are hereinafter, abandoning the volume of block stone and rock ballast in the cubic meter of stone is more than 70%；
C, composite geo-membrane uses
Sub-layer bottom of foundation ditch is laid with composite geo-membrane, and composite geo-membrane technical requirements are membrane material thickness 0.30mm, nominally fracture
Intensity >=12.0kN/m, CBR bursting strength >=2.20KN, vertically and horizontally tearing brute force >=0.40 KN, resistance to hydrostatic pressure specified value >=
0.50MPa, peel strength >=6N/cm；
D, foundation pit backfills
Backfill block stone, rock ballast and mountain flour in foundation pit successively backfill block stone, rock ballast and mountain flour and are compacted backfill layer, hole between block stone (4)
Gap (2) is filled using rock ballast (5) and mountain flour (3)；
E, bitumen layer is laid with
Backfill layer re-lays bitumen layer and completes construction.
2. a kind of subgrade in salty soil zone according to claim 1 is actively every salt construction method, it is characterised in that described
In step A foundation pit depth of fill h > l.5m when, compactness >=93%；When depth of fill 0.8m≤h≤1.5m, compactness >=
95%；When depth of fill h < 0.8m, compactness >=97%.
3. a kind of subgrade in salty soil zone according to claim 1 is actively every salt construction method, it is characterised in that described
It is rolled 5 times in step A using 50T towed sheep foot roller, land leveller is mended after flattening surface imperfection nest using 22T halo vibrated roller
Water-powered roller is pressed 4 times.
4. a kind of subgrade in salty soil zone according to claim 1 is actively every salt construction method, it is characterised in that described
Layer is backfilled in step D and first backfills block stone, rock ballast, is rolled 2 times using 30T padfoot roller, then roll 5 with 50T towed sheep foot roller
Time, surface imperfection nest is filled and led up with mountain flour, is sprinkled water, steady using land leveller and rolled 3 times using 22T smooth-wheeled roller.
5. a kind of subgrade in salty soil zone according to claims 3 or 4 is actively every salt construction method, it is characterised in that institute
The construction water for stating varieties in saline-alkali areas in step A, D is purified with water purification equipment, and construction water need to meet " concrete water mark
It is quasi- " JGJ63-2006 requirement.
6. a kind of subgrade in salty soil zone according to claim 5 is actively every salt construction method, it is characterised in that described
Step A, the La-Ro-30 type purifier that water purification equipment produces in D for Gansu Prov. Inst. of Membrane Science & Technology.
7. a kind of subgrade in salty soil zone according to claim 1 is actively every salt construction method, it is characterised in that described
Rock ballast and the nonuniformity coefficient of mountain flour mixing are 15-20 in step D.
8. a kind of subgrade in salty soil zone according to claim 1 is actively every salt construction method, it is characterised in that described
Saline and alkaline plot is ponding section in step A, teds earth's surface after the ponding in ponding section is excluded, and teds depth not less than 50cm.
9. a kind of subgrade in salty soil zone according to claim 1 is actively every salt construction method, it is characterised in that described
Time lift thickness is more than that 50cm layering is laid with composite geo-membrane in foundation pit in step D, returns the every 50cm of lift thickness and is laid with one layer again
Close geomembrane.
10. a kind of subgrade in salty soil zone according to claim 9 is actively every salt construction method, it is characterised in that described
The composite geo-membrane lap of splice is 0.3-0.5m in step D.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110121962A (en) * | 2019-06-20 | 2019-08-16 | 白银帝尧农业机械制造有限责任公司 | A kind of salt-soda soil comprehensive improvement device |
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