CN104532714B - Roadbed structure for treating deep soft soil karst foundation - Google Patents
Roadbed structure for treating deep soft soil karst foundation Download PDFInfo
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- CN104532714B CN104532714B CN201410848913.9A CN201410848913A CN104532714B CN 104532714 B CN104532714 B CN 104532714B CN 201410848913 A CN201410848913 A CN 201410848913A CN 104532714 B CN104532714 B CN 104532714B
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- rotary churning
- layer
- karst
- churning pile
- soft soil
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/16—Foundations formed of separate piles
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Architecture (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a roadbed structure for treating a deep soft soil karst foundation. The roadbed structure for treating the deep soft soil karst foundation comprises a karst layer, a hard soil layer located above the karst layer, a soft soil layer located above the hard soil layer, a cushion laid on the top of the soft soil layer and a roadbed laid on the top of the cushion, wherein multiple rows of chemical churning piles are arranged on the soft soil layer on the bottom of the cushion in the direction of a road, each row of chemical churning piles includes a plurality of chemical churning piles which are arranged side by side, the bottom of each chemical churning pile penetrates through the soft soil layer to be inserted into the hard soil layer, the top of each chemical churning pile is flush with the top surface of the soft soil layer and is connected with the bottom of the cushion, and an integrated grouting reinforcement area is formed by conducting pouring in the lower portion of the hard soil layer and the karst layer. According to the roadbed structure for treating the deep soft soil karst foundation, the stability of the deep soft soil karst foundation can be guaranteed, post-construction settlement of the foundation can be effectively controlled, and stability and deformation control of a high speed railway foundation in a deep soft soil karst area are achieved.
Description
Technical field
The present invention relates to Geotechnical Engineering field, in particular to a kind of roadbed knot processing Deep Thick Soft Ground karst foundation
Structure.
Background technology
Soft soil foundation shows as to the harm of roadbed, and ground shearing strength is not enough to bear the deadweight of superstructure with outward
Lotus, roadbed easily produces partly or wholly failure by shear；In addition, soft soil roadbed compressibility is high, meeting under outside load action
Produce larger settlement after construction and differential settlement, the normal operation of impact roadbed.The harm of karst foundation roadbed engineering, one
As show as the Upper Plate of Karst Cave roadbed causing that caves in and collapse destruction, and cause subgrade settlement；As can be seen here, weak soil and karst foundation
All there is stability problem and settlement issues harm to roadbed.Build high-speed railway in Deep Thick Soft Ground karst foundation it is necessary to soft
Soil and karst are processed simultaneously, it is necessary to take reinforcement measure to control roadbed in addition to ensureing the long-time stability of road structure
Settlement after construction.There is presently no the road structure that can simultaneously meet above-mentioned requirements.
Content of the invention
Present invention aim to providing a kind of road structure processing Deep Thick Soft Ground karst foundation, this structure is passed through to adopt
Take rational reinforcement measure to improve the bearing capacity of Deep Thick Soft Ground roadbed, and control settlement after construction within specification allowed band, with
When karst is processed, can guarantee that the long-time stability of road structure.
For realizing this purpose, the road structure of the process Deep Thick Soft Ground karst foundation designed by the present invention, it includes karst
Layer, be located at hard stratum above karst layer, be located at Soft Soil Layer above hard stratum it is characterised in that: it also includes being laid on soft
The mattress layer at soil layer top, it is laid on the roadbed at mattress layer top, set along line direction in the Soft Soil Layer of described mattress layer bottom
There is multiple rows of rotary churning pile, described often row rotary churning pile includes the multiple rotary churning piles being arranged side by side, and the stake bottom of each rotary churning pile described is all worn
Soft Soil Layer insertion hard stratum, the stake top of each rotary churning pile described and the either flush of Soft Soil Layer thoroughly, and each rotary churning pile described
Stake top connects the bottom of mattress layer, carries out pouring the grouting and reinforcing forming integral type in the bottom of described hard stratum with karst layer
Area.
Described mattress layer includes bottom metalling, medium-sand seam, civil grille and top metalling, wherein, described bottom
Metalling is laid on the top surface of Soft Soil Layer, and described medium-sand seam is laid on the top of bottom metalling, described civil grille paving
It is located at the top of medium-sand seam, described top metalling is laid on the top of civil grille, and described roadbed is laid on top rubble
The top of layer.
The principle of the present invention is:
The Deep Thick Soft Ground of base table layer carries out basement process using rotary churning pile over the ground first, and the long Soft Soil Layer that penetrates of stake is to pan soil
Layer, forms the composite foundation with globality, water stability and some strength, thus improving foundation bearing capacity, reduces ground uneven
Even sedimentation and settlement after construction, reach the purpose of reinforcement of soft soil ground.Then, to the karst interface of stone and earth under deep soft soil foundation
Using grouting and reinforcing, filling Karst Fissures, solution cavity, blocking underground water activity space, form water barrier, prevent because of level of ground water ripple
Move and cause karst collapse.Slip casting water barrier is reinforced thickness and is not less than 10m, is not less than 3m, below not wherein more than interface of stone and earth
Less than 7m.So by grouting and reinforcing being carried out to bottom karst it is ensured that the long-time stability of karst foundation；So by depth
The basement process of thick weak soil and the injecting treatment to bottom karst, reached the process to Deep Thick Soft Ground karst foundation it is ensured that
The long-time stability of roadbed and settlement request.
The invention has the benefit that
The present invention carries out grouting and reinforcing to karst layer, adopts rotary churning pile to reinforce Soft Soil Layer, and rotary churning pile insertion pan soil
The top of layer, grouting and reinforcing area stretches into hard stratum bottom, lays mattress layer, this structure shape between Soft Soil Layer and roadbed simultaneously
Formula can ensure the stability of weak soil karst foundation, and the settlement after construction of energy effective control ground, realizes Deep Thick Soft Ground karst region high
The stability of fast railway bed and Deformation control target.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the laying structure top view of rotary churning pile in the present invention；
Fig. 3 is the mplifying structure schematic diagram of a part in Fig. 1.
Wherein, 1 roadbed, 2 Soft Soil Layers, 3 hard stratums, 4 karst layers, 5 interface of stone and earths, 6 grouting and reinforcings
Area, 7 rotary churning piles, 8 mattress layers, 9 bottom metallings, 10 civil grilles, 11 medium-sand seams, 12 top rubbles
Layer.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The road structure of process Deep Thick Soft Ground karst foundation as shown in Figures 1 to 3, it includes karst layer 4, is located at karst layer
The hard stratum 3 of 4 tops, it is located at the Soft Soil Layer 2 of hard stratum 3 top, is laid on the mattress layer 8 at Soft Soil Layer 2 top, is laid on bed pad
Layer 8 top roadbed 1, described mattress layer 8 (mattress layer 8 is used for ensureing common stress of pile and soil, form compound foundation) bottom soft
It is provided with multiple rows of rotary churning pile 7 along line direction, described often row rotary churning pile 7 includes the multiple rotary churning piles 7 being arranged side by side, institute in soil layer 2
The stake bottom stating each rotary churning pile 7 all penetrates Soft Soil Layer 2 insertion hard stratum 3, and (high capacity of hard stratum 3, rotary churning pile 7 bottom is located
In hard stratum 3, thus improving the bearing capacity of rotary churning pile 7) either flush of the stake top of each rotary churning pile 7 described and Soft Soil Layer 2,
And the stake top of described each rotary churning pile 7 connects the bottom of mattress layer 8, is poured in the bottom of described hard stratum 3 with karst layer 4
Build the grouting and reinforcing area 6 forming integral type.
The grouting and reinforcing area 6 of above-mentioned integral type, is prevented from causing karst collapse because of groundwater level fluctuation.
In technique scheme, described mattress layer 8 includes bottom metalling 9, medium-sand seam 11, civil grille 10 and top
Metalling 12, wherein, described bottom metalling 9 is laid on the top surface of Soft Soil Layer 2, and it is broken that described medium-sand seam 11 is laid on bottom
The top of rock layers 9, described civil grille 10 is laid on the top of medium-sand seam 11, and described top metalling 12 is laid on building lattice
The top of grid 10, described roadbed 1 is laid on the top of top metalling 12.
In technique scheme, in described multiple rows of rotary churning pile 7, the distance between adjacent two row's rotary churning piles 7 are equal, described every
In row's rotary churning pile 7, the distance between two neighboring rotary churning pile 7 side by side is equal.
In technique scheme, in described multiple rows of rotary churning pile 7, the distance between adjacent two row's rotary churning piles 7 are equal to and often arrange churning
The distance between two neighboring rotary churning pile 7 side by side in stake 7.Above-mentioned design makes the square arrangement form of multiple rotary churning piles 7.This
Plant the relatively simple convenience of foursquare arrangement form.
In technique scheme, the stake footpath of each rotary churning pile 7 described is equal, and is 0.5～1.5m, described often row's churning
The rotary churning pile stake footpath that in stake 7, the distance between two neighboring rotary churning pile 7 side by side is equal to 2～3 times.Pile spacing is according to multiple work
Set by journey experience.
In technique scheme, the laying depth scope of described bottom metalling 9 is 0.1～0.3m, medium-sand seam 11
Laying depth scope is 0.05～0.15m, and the laying depth scope of civil grille 10 is 0.05～0.15m, top metalling 12
Laying depth scope be 0.1～0.3m.
In technique scheme, it is po42.5 level and above ordinary silicon that the cement of described rotary churning pile 7 adopts strength grade
Acid salt cement or blast furnace cement, the ratio of mud of cement grout is 0.8:1～1:1, the indoor soil cement of this cement 28 days no lateral spacing
Comprcssive strength is not less than 3.0mpa.
In technique scheme, when Soft Soil Layer 2 is sandy soils, eluvium, the soil cement no lateral spacing of rotary churning pile 7 cement resists
Compressive Strength scope is 5～8mpa, and water under high pressure mud pressure limit during rotary churning pile 7 construction is 20～25mpa.
In technique scheme, thickness range in interface of stone and earth more than 5 hard stratum 3 for the described grouting and reinforcing area 6 is 3
～5m, in interface of stone and earth karst 4 below 5, the scope of thickness is 5～7m, and the total thickness in described grouting and reinforcing area 6 is 8
～12m.So, by Soft Soil Layer 2 is carried out with rotary churning pile reinforcing, formed and there is the compound of globality, water stability and some strength
Ground.
In above-mentioned grouting and reinforcing area 6, the distance of adjacent two row's injected holes is equal, often two adjacent side by side in row's injected hole
The distance of injected hole is equal, and in grouting and reinforcing area 6 adjacent two row's injected holes distance be equal to often row injected hole in adjacent side by side
Two injected holes distance (i.e. injected hole adopts arranged in squares, pitch of holes 5.0m)；Grouting and reinforcing area 6 in embankment location
Reinforcing scope to the outer 5.0m region of embankment toe, in cutting location the reinforcing scope in grouting and reinforcing area 6 to lateral sulcus platform outward flange,
The cement grout ratio of mud of described injected hole is 0.8:1～1:1.If meeting at empty Karst corridor, relatively cavern or crack, first fill
Note sand gravel or cement mortar carry out filling to cavity, then adopt cement grout or two fluid grouting, and full-filling solution cavity is using single liquid
Slip casting.Slip casting adopts m15 cement mortar by full for injected hole packing to aperture after terminating in time.So by Deep Thick Soft Ground
Ground carries out rotary churning pile process and the injecting treatment to bottom karst, has reached the process to Deep Thick Soft Ground karst foundation, protects
Long-time stability and the settlement request of roadbed are demonstrate,proved.
It is 38～43 ° of be that above-mentioned grouting cement includes the cement of po42.5 and Baume concentration, and modulus is 2.4～3.0
Waterglass.
The present invention adopts rotary churning pile 7 to process Deep Thick Soft Ground, improves bearing capacity under soft foundation and settlement after construction, using grouting and reinforcing rock
The molten stability forming water barrier control bottom karst foundation.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Claims (7)
1. a kind of road structure processing Deep Thick Soft Ground karst foundation, it includes karst layer (4), is located above karst layer (4)
Hard stratum (3), be located at hard stratum (3) above Soft Soil Layer (2) it is characterised in that: it also includes being laid on Soft Soil Layer (2) top
Mattress layer (8), be laid on the roadbed (1) at mattress layer (8) top, along circuit in the Soft Soil Layer (2) of described mattress layer (8) bottom
Direction is provided with multiple rows of rotary churning pile (7), multiple rotary churning piles (7) that described often row's rotary churning pile (7) inclusion is arranged side by side, each rotation described
The stake bottom of spray stake (7) all penetrates Soft Soil Layer (2) insertion hard stratum (3), the stake top of described each rotary churning pile (7) and Soft Soil Layer (2)
Either flush, and each rotary churning pile described (7) stake top connect mattress layer (8) bottom, in the bottom of described hard stratum (3)
With carry out pouring the grouting and reinforcing area (6) forming integral type in karst floor (4)；
Described mattress layer (8) includes bottom metalling (9), medium-sand seam (11), civil grille (10) and top metalling (12),
Wherein, described bottom metalling (9) is laid on the top surface of Soft Soil Layer (2), and described medium-sand seam (11) is laid on bottom rubble
The top of layer (9), described civil grille (10) is laid on the top of medium-sand seam (11), and described top metalling (12) is laid on
The top of civil grille (10), described roadbed (1) is laid on the top of top metalling (12)；
In described multiple rows of rotary churning pile (7), the distance between adjacent two row's rotary churning piles (7) are equal, in described often row's rotary churning pile (7) simultaneously
The distance between two neighboring rotary churning pile (7) of row is equal；
In described multiple rows of rotary churning pile (7), the distance between adjacent two row's rotary churning piles (7) are equal to and often arrange phase side by side in rotary churning pile (7)
The distance between adjacent two rotary churning piles (7).
2. according to claim 1 process Deep Thick Soft Ground karst foundation road structure it is characterised in that: described each rotation
The stake footpath of spray stake (7) is equal, and is 0.5～1.5m, two neighboring rotary churning pile (7) side by side in described often row's rotary churning pile (7)
The distance between be equal to 2～3 times of rotary churning pile stake footpath.
3. according to claim 1 process Deep Thick Soft Ground karst foundation road structure it is characterised in that: described bottom is broken
The laying depth scope of rock layers (9) is 0.1～0.3m, and the laying depth scope of medium-sand seam (11) is 0.05～0.15m, building
The laying depth scope of grid (10) is 0.05～0.15m, and the laying depth scope of top metalling (12) is 0.1～0.3m.
4. according to claim 1 process Deep Thick Soft Ground karst foundation road structure it is characterised in that: described rotary churning pile
(7) it is po42.5 level and above Portland cement or blast furnace cement that cement adopts strength grade, the water of cement grout
Gray scale is 0.8:1～1:1, and 28 days unconfined compressive strengths of indoor soil cement of this cement are not less than 3.0mpa.
5. according to claim 1 process Deep Thick Soft Ground karst foundation road structure it is characterised in that: work as Soft Soil Layer
(2) the soil cement unconfined compressive strength scope for rotary churning pile (7) cement when sandy soils, eluvium is 5～8mpa, rotary churning pile
(7) water under high pressure mud pressure limit when constructing is 20～25mpa.
6. according to claim 1 process Deep Thick Soft Ground karst foundation road structure it is characterised in that: described slip casting adds
Thickness range in the above hard stratum of interface of stone and earth (5) (3) for the Gu Qu (6) is 3～5m, in the following rock of interface of stone and earth (5)
The scope of the interior thickness of soluble layer (4) is 5～7m, and the total thickness of described grouting and reinforcing area (6) is 8～12m.
7. according to claim 6 process Deep Thick Soft Ground karst foundation road structure it is characterised in that: above-mentioned slip casting adds
In Gu Qu (6), the distance of adjacent two row's injected holes is equal, and often the distance of adjacent side by side two injected holes in row's injected hole is equal,
And in grouting and reinforcing area (6) distance of adjacent two row's injected holes be equal to adjacent side by side two injected holes in every row's injected hole away from
From；In embankment location, to the outer 5.0m region of embankment toe, in cutting location grouting and reinforcing area for the reinforcing scope of grouting and reinforcing area (6)
(6) to lateral sulcus platform outward flange, the cement grout ratio of mud of described injected hole is 0.8:1～1:1 to reinforcing scope.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410848913.9A CN104532714B (en) | 2014-12-30 | 2014-12-30 | Roadbed structure for treating deep soft soil karst foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848913.9A CN104532714B (en) | 2014-12-30 | 2014-12-30 | Roadbed structure for treating deep soft soil karst foundation |
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| CN104532714A CN104532714A (en) | 2015-04-22 |
| CN104532714B true CN104532714B (en) | 2017-02-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106193062A (en) * | 2016-08-19 | 2016-12-07 | 西北大学 | Loess high roadbed and construction method thereof in ditch engineering are filled out in a kind of mountain of moving |
| CN107816010A (en) * | 2017-10-31 | 2018-03-20 | 中铁四局集团第工程有限公司 | A kind of Coastal beach area roadbed dykes and dams cofferdam construction method |
| CN108018752B (en) * | 2017-12-02 | 2020-07-03 | 江苏惠淳建设有限公司 | Reinforcement construction process for soft soil roadbed |
| CN109958014A (en) * | 2017-12-23 | 2019-07-02 | 侯林杰 | A kind of Reinforcement of Highway structure |
| CN110805054A (en) * | 2019-11-20 | 2020-02-18 | 湖南易兴建筑有限公司 | Construction method of reinforced concrete composite foundation |
| CN112982051B (en) * | 2021-02-20 | 2024-04-26 | 温俊魁 | Roadbed suitable for karst landform and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3765000B2 (en) * | 1998-03-10 | 2006-04-12 | 株式会社竹中工務店 | Ground improvement foundation method for soft ground. |
| CN202466342U (en) * | 2012-03-19 | 2012-10-03 | 中铁第四勘察设计院集团有限公司 | Reinforcing structure of deep soil foundation of high speed railway |
| CN202466345U (en) * | 2012-03-19 | 2012-10-03 | 中铁第四勘察设计院集团有限公司 | Karst foundation solidifying structure of high speed railway |
| CN202830675U (en) * | 2012-09-06 | 2013-03-27 | 中铁二院工程集团有限责任公司 | Deep and thick soft soil composite floating pile foundation damage reinforcement structure |
| CN204401385U (en) * | 2014-12-30 | 2015-06-17 | 中铁第四勘察设计院集团有限公司 | A kind of road structure processing Deep Thick Soft Ground karst foundation |
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