CN114892461B - Self-adaptive deformation deep expansion soil roadbed structure and construction method thereof - Google Patents
Self-adaptive deformation deep expansion soil roadbed structure and construction method thereof Download PDFInfo
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- CN114892461B CN114892461B CN202210573130.9A CN202210573130A CN114892461B CN 114892461 B CN114892461 B CN 114892461B CN 202210573130 A CN202210573130 A CN 202210573130A CN 114892461 B CN114892461 B CN 114892461B
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- 239000002689 soil Substances 0.000 title claims abstract description 72
- 238000010276 construction Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 158
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 229920000876 geopolymer Polymers 0.000 claims description 36
- 239000002002 slurry Substances 0.000 claims description 25
- 238000003860 storage Methods 0.000 claims description 25
- 239000004575 stone Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 230000013011 mating Effects 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- 239000010881 fly ash Substances 0.000 claims description 12
- 229920003041 geopolymer cement Polymers 0.000 claims description 12
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000010426 asphalt Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 210000005056 cell body Anatomy 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 description 9
- 238000011105 stabilization Methods 0.000 description 9
- 239000004568 cement Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Inorganic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Public Health (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a self-adaptive deformation deep expansive soil roadbed structure, which is characterized in that the expansion of expansive soil in a roadbed foundation is adapted through a flexible movable pile in a piston pile, and then a piston sealing ring is driven to move, so that the space size of a closed cavity is changed, a water pumping or draining effect is formed, the water content of the expansive soil in the roadbed foundation is self-adaptively adjusted, and further the deformation adjustment of the expansive soil is formed. The invention also provides a construction method of the self-adaptive deformation deep expansive soil roadbed structure.
Description
[ Field of technology ]
The invention relates to the technical field of road engineering, in particular to a self-adaptive deformation deep expansive soil roadbed structure and a construction method thereof.
[ Background Art ]
The expansive soil is cohesive soil mainly containing mineral components such as montmorillonite, illite, kaolinite and the like, has strong hydrophilic property and is easy to expand when meeting water. When the expansive soil repeatedly swells and loses water and contracts, serious pulling and expanding fracture damage can be caused to the roadbed. For the deep expansive soil roadbed, the stress change caused by water absorption, expansion, water loss and shrinkage of expansive soil is stronger, so that the treatment of the deep expansive soil roadbed becomes a great difficulty in road construction.
In the related art, the treatment methods of the expansive soil roadbed mainly comprise a replacement filling method, a chemical treatment (lime soil improvement) method, a packing method and the like, but the methods can only treat the shallow expansive soil roadbed or the expansive soil filled roadbed, and the treatment effect is not ideal, so that uneven settlement is easy to cause, the roadbed structure is damaged, and the service life of the roadbed is shortened. Therefore, it is necessary to provide a new deep expansive soil roadbed structure and a construction method thereof to solve the above technical problems.
[ Invention ]
The invention aims to provide a self-adaptive deformation deep expansive soil roadbed structure capable of adjusting the water content of expansive soil in a roadbed foundation and a construction method thereof.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the utility model provides a self-adaptation warp's deep expansion soil roadbed structure, includes roadbed basis, piston stake and layer of mating formation, the piston stake cloth in the roadbed basis is in, the layer of mating formation is laid in roadbed basis top, the piston stake includes the cavity pile body and draws water the unit, draw water the unit set up in the cavity region of cavity pile body, draw water the unit including flexible movable rod, piston seal circle and drain pipe, flexible movable rod follows the axis direction of cavity pile body sets up, its bottom with the bottom mounting of cavity pile body, the top with the layer of mating formation is fixed, piston seal snare is located on the flexible movable rod and the surface butt the inner wall of cavity pile body, the quantity of piston seal circle is provided with a plurality of piston seal circle interval in proper order will the cavity region of cavity pile body separates and forms a plurality of airtight cavity, run through on the lateral wall of cavity pile body be provided with a plurality of water inlets, the water inlet intercommunication airtight cavity with the outside space of cavity pile body, two adjacent airtight cavity passes through a drain pipe the water pipe is located the sealed cavity below with the water of cavity is located the sealed foundation of a side by side of stage.
Preferably, the bottom end of the drain pipe is fixed with the piston sealing ring positioned below, and the top end of the drain pipe passes through the piston sealing ring positioned above and is 40cm higher than the upper surface of the drain pipe; and a water suction port is arranged on the side wall, close to the lower piston sealing ring, of the bottom end of the drain pipe.
Preferably, the piston piles are distributed in a rectangular array in the roadbed foundation; in the extending direction of the roadbed, a plurality of rows of the piston piles are distributed at equal intervals; 3-5 piston piles are arranged side by side on the section of the roadbed in the width direction, and the pile length is continuously shortened from two sides of the roadbed to the central direction of the roadbed.
Preferably, the water inlet comprises a first horizontal section, an inclined section and a second horizontal section, the first horizontal section is close to the inner side of the hollow pile body, the second horizontal section is close to the outer side of the hollow pile body, and the inclined section is connected with the first horizontal section and the second horizontal section and extends downwards in an inclined manner from the first horizontal section to the second horizontal section; a flexible filter screen is arranged in the first horizontal section and covers the whole section of the first horizontal section; a filter plug is arranged in the second horizontal section, and the filter plug covers the whole section of the second horizontal section; the inclined section is internally provided with two inclined baffles and blocking balls, the inclined baffles are in horn mouth design, one small mouth end faces one side of the second horizontal section, and the blocking balls are arranged between the inclined baffles and the flexible filter screen.
Preferably, the layer of mating formation includes road bed course, steady layer, bituminous paving and afforestation groove, road bed course, steady layer, bituminous paving follow down up range upon range of setting in proper order, afforestation groove set up in the top of road bed course, and be located the central point of layer of mating formation, the left and right sides of afforestation groove all is provided with steady layer of water reaches bituminous paving, the top of flexible movable rod with road bed course is fixed, a plurality of collector pipes have been laid to the upper surface of road bed course, one of the top in the piston stake the drain pipe with the collector pipe intercommunication is located a plurality of in the same row drain pipes in the piston stake are assembled in the collector pipe, the end of collector pipe is assembled in the afforestation groove.
Preferably, the greening groove comprises a U-shaped groove body, a water storage tank and a water inlet pipe, wherein the U-shaped groove body encloses a landfill space, planting soil is filled in the landfill space, and vegetation is planted on the planting soil; the water storage tank is fixed in on the groove inside wall of U-shaped cell body, the bottom of water inlet pipe with the collector pipe intercommunication, the top pass the U-shaped cell body with the storage tank intercommunication is carried water in the storage tank, the storage tank is close to run through on the lateral wall in landfill space and be provided with the infiltration hole, the afforestation groove still includes the regulation sponge, the regulation sponge with the inside wall of storage tank is fixed and covers completely the infiltration hole.
Preferably, the self-adaptive deformed deep expansive soil roadbed structure further comprises drainage ditches and water stopping curtain walls, wherein the drainage ditches are arranged on the left side and the right side of the pavement layer and are used for collecting rainwater collected on the asphalt pavement and then carrying out centralized drainage treatment; the bottom of stagnant water curtain inserts in the road bed basis, top butt the both sides of layer of mating formation, stagnant water curtain is used for the separation layer of mating formation and escape canal.
Preferably, the roadbed cushion is prepared by modifying the expansive soil with geopolymer slurry, wherein the geopolymer slurry is prepared by mixing fly ash, silica fume, weak base excitant, glass fiber and water, and the weight ratio of the fly ash, the silica fume, the weak base excitant and the water is as follows: (0.45-0.55): (0.50-0.55): (0.4-0.45): (0.15-0.2), the glass fiber mixing amount is 1.5-2% of the total mass of the roadbed cushion; the mixing amount of the geopolymer slurry in the roadbed cushion layer is 20% -25% of the total mass of the roadbed cushion layer.
Preferably, the water stabilization layer is formed by mixing broken stone with geopolymer slurry, and the particle grading ratio of the broken stone is as follows: crushed stone with the particle size of 0 mm-4.75 mm: crushed stone with particle size of 5 mm-10 mm: crushed stone with particle size of 10 mm-15 mm: 10 mm-25 mm particle size crushed stone= (2.0-2.4): (0.8-0.9): (0.8-0.9): (1.6-1.8), wherein the geopolymer slurry is formed by mixing fly ash, silica fume, weak base excitant and water, and the weight ratio of the fly ash is as follows: silica fume: weak base excitant: water= (0.5-0.55): (0.45-0.5): (0.35-0.5): (0.1-0.15), the mixing amount of the geopolymer slurry is 3.5-4.5% of the total mass of the crushed stone.
The invention also provides a construction method of the self-adaptive deformation deep expansive soil roadbed structure, which comprises the following steps:
Step one: marking side lines on two sides of a road by using a measuring instrument, cleaning shallow surface soil in a construction range, and marking pile positions of each piston pile;
Step two: the method comprises the steps of adopting a stirring pile machine to construct a water stop curtain wall, using a pile driver to insert a piston pile into a roadbed foundation, coating engine oil on a pile top pipe orifice after the piston pile is installed in place, sealing by adopting a wood board, mixing geopolymer slurry with expansive soil to form a roadbed cushion, paving a water collecting pipe during roadbed cushion construction, drilling a hole body at a pile position where the piston pile is buried after construction is completed, adopting a stepped cutting mode, drilling a large hole at the top, reducing the drilling hole near the pile top position, removing a template sealed at the top of the piston pile after the top of the piston pile is exposed, communicating the water discharging pipe with the water collecting pipe, and casting geopolymer concrete in the drilling hole to fix the top of a flexible movable rod with the roadbed cushion into a whole;
step three: installing the prefabricated greening groove in place by adopting hoisting equipment, and communicating the water collecting pipe with the water inlet pipe;
Step four: paving a water stabilizing layer and an asphalt pavement by adopting a paver;
step five: and excavating and pouring a drainage ditch close to the edge of the roadbed, and completing construction.
Compared with the related art, the self-adaptive deformation adjusting of the self-adaptive deformation deep expansive soil roadbed structure provided by the invention realizes the self-adaptive deformation adjusting of expansive soil in a roadbed foundation through the cooperation of the piston piles and the roadbed cushion layers; the geopolymer is used for replacing cement to prepare geopolymer concrete, geopolymer slurry, a geopolymer water stabilization layer and the like, which belong to green environment-friendly materials, so that the dependence of expanded soil roadbed treatment and water stabilization layer construction on traditional cementing materials such as cement and the like is eliminated, and the ecological environment protection is facilitated; on the other hand, the water extracted from the expansive soil layer by the geopolymer concrete piston pile can be stored in a water storage tank of the greening groove, so that the high-efficiency utilization of the water is realized; the construction difficulty is small, the cost is low, and the construction period is short: the geopolymer concrete piston pile can be constructed by referring to prefabricated pipe piles, related components can be produced in batch in a factory, the quality is easy to control, the construction difficulty is low, the popularization is convenient, and because the geopolymer material is adopted for improving the expansive soil and preparing the water stabilization layer, the geopolymer is low in price, the setting and hardening speed is faster than that of cement, the engineering cost can be effectively reduced, and the construction speed is accelerated.
[ Description of the drawings ]
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic structural view of a self-adaptive deformation deep expansive soil subgrade structure provided by the invention;
FIG. 2 is a schematic view of a semi-sectional structure of the adaptively deformed deep expansive soil subgrade structure of FIG. 1;
FIG. 3 is a schematic diagram of a semi-sectional structure of the piston pile;
FIG. 4 is a schematic view of the structure of the water inlet;
Fig. 5 is a schematic structural view of the greening groove.
[ Detailed description ] of the invention
In order to better understand the technical solution in the embodiments of the present application and to make the above objects, features and advantages of the present application more comprehensible, the following description of the specific embodiments of the present application is given in connection with the accompanying drawings.
Referring to fig. 1-5 in combination, the present invention provides a self-adaptive deformation deep expansive soil roadbed structure 100, which comprises a roadbed foundation 10, a piston pile 20, a paving layer 30, a drainage ditch 40 and a water stop curtain wall 50.
The roadbed foundation 10 is an expansive soil roadbed foundation, the piston piles 20 are arranged in the roadbed foundation 10 and used for transmitting loads applied downwards by a road surface to a soil (rock) layer with a strong deep loading force, and meanwhile, the expansive soil roadbed foundation can be compacted so as to improve the bearing capacity and compactness of foundation soil.
The piston piles 20 are distributed in a rectangular array in the roadbed foundation 10; in the extending direction of the roadbed, a plurality of rows of the piston piles 20 are equidistantly arranged at intervals; 3-5 piston piles 20 are arranged side by side on the section of the roadbed in the width direction, and the pile length is continuously shortened from two sides of the roadbed to the central direction of the roadbed. In this embodiment, 5 piston piles 20 are disposed in each row, and pile lengths are respectively 12m, 8m, 4m, 8m, and 12m.
The piston pile 20 comprises a hollow pile body 21 and a pumping unit 22, and the pumping unit 22 is arranged in a hollow area of the hollow pile body 21.
The hollow pile body 21 is made of geopolymer concrete, and has an outer diameter of 40cm and a wall thickness of 5cm.
The pumping unit 22 includes a flexible movable rod 221, a piston packing 222, and a drain pipe 223. The flexible movable rod 221 is disposed along the central axis of the hollow pile body 21, the bottom end of the flexible movable rod is fixed with the hollow pile body 21, and the top end of the flexible movable rod is fixed with the paving layer 30; the piston seal 222 is sleeved on the flexible movable rod 221, and the outer surface of the piston seal abuts against the inner wall of the hollow pile body 21, so as to form a sealing effect. The number of the piston seal rings 222 is plural, and the plurality of piston seal rings 222 sequentially partition the hollow area of the hollow pile body 21 at intervals to form a plurality of closed chambers 224; two adjacent closed chambers 224 are communicated through one drain pipe 223, the drain pipe 223 guides water of the lower closed chamber 224 to the upper closed chamber 224 step by step, and the drain pipe 223 positioned at the uppermost position discharges water to the outside of the roadbed foundation 10.
Specifically, the bottom end of the drain pipe 223 is fixed to the piston seal 222 located below, and the top end passes through the piston seal 222 located above and is 40cm higher than the upper surface of the piston seal 222. The bottom of the drain pipe 223 is close to the side wall of the lower piston sealing ring and is provided with a water suction port, and the bottom of the drain pipe 223 is fixed with the lower piston sealing ring 222, so that the bottom opening of the drain pipe 223 is blocked, and therefore, the side wall is required to be additionally provided with a water suction port.
The flexible movable rod 221 is made of engineering plastic with high weather resistance, and the diameter of the flexible movable rod is 10cm; the distance between two adjacent piston seal rings 222 is 4-5m, and the piston seal rings 222 are cylindrical rubber bodies.
A plurality of water inlets 210 are formed in the side wall of the hollow pile body 21 in a penetrating manner, and the water inlets 210 are communicated with the closed cavity 224 and the outer space of the hollow pile body 21.
The self-adaptive principle of the self-adaptive deformation deep expansive soil roadbed structure 100 provided by the invention is as follows: when the expansive soil in the subgrade foundation 10 absorbs water and expands, the expansive soil can be extruded to move on the paving layer 30, so that the top of the flexible movable rod 221 is driven to stretch upwards, the whole flexible movable rod 221 is stretched, the length is increased, the interval between two adjacent piston sealing rings 222 is increased, the space of the closed cavity 224 is increased, the internal pressure is reduced, the pressure on the outer side of the hollow pile body 20 is greater than the pressure on the inner side, accumulated water in the subgrade foundation 10 enters the closed cavity 224 through the water inlet 210 under the action of pressure difference, is conveyed upwards step by step through the water drainage pipe, and is finally discharged outside the subgrade foundation 10. The drain pipe 223 is movably connected with a piston sealing ring 222 above the drain pipe, so as to meet the requirement of position change of the piston sealing ring 222. When the expansive soil in the subgrade foundation 10 loses water and expands, the subgrade pad layer 31 slowly descends under the action of the upper load, so that the flexible movable rod 221 is retracted.
Both ends of the drain pipe 223 are fixed with piston sealing rings, and the fixed positions also need to be sealed, so as to avoid affecting the sealing performance of the closed chamber 224. Meanwhile, the drain pipe 223 is selected as a corrugated pipe, and when the positions of the upper piston sealing ring and the lower piston sealing ring are changed, the drain pipe 223 stretches and contracts to adapt to the change of the interval.
Further, the water inlet 210 includes a first horizontal section 211, an inclined section 212 and a second horizontal section 213, the first horizontal section 211 is located at the inner side of the hollow pile body 21, the second horizontal section 213 is located at the outer side of the hollow pile body 21, and the inclined section 212 connects the first horizontal section 211 and the second horizontal section 213 and extends obliquely downward from the first horizontal section 211 to the second horizontal section 213.
A flexible filter screen 23 is arranged in the first horizontal section 211, and the flexible filter screen 23 covers the whole section of the first horizontal section 211; a filter plug 24 is arranged in the second horizontal section 213, and the filter plug 24 covers the whole section of the second horizontal section 213. The filter plug 24 plays a role in rough filtration, the flexible filter screen 23 plays a role in fine filtration, and two layers of filtration can prevent sundries in the roadbed from entering the hollow area of the hollow pile body 21.
The inclined section 212 is arranged in an inclined manner, the inclined section 212 is internally provided with two inclined baffles 25 and blocking balls 26, the inclined baffles 25 are in a horn mouth design, one small mouth end faces to one side of the second horizontal section 213, the blocking balls 26 are arranged between the inclined baffles 25 and the flexible filter screen 23, when water flows back, the blocking balls 26 can be impacted, so that the blocking balls 26 block one small mouth end of the horn mouth, backflow of water is limited, and the flowing direction of the water is as follows: the water enters the hollow area of the hollow pile body 21 from the outer side of the hollow pile body 21 through the water gap 210, and the flowing power of the water is the gravity of the high-level water in the roadbed foundation 10.
The layer 30 of mating formation lays in the top of road bed basis 10, layer 30 of mating formation includes road bed course 31, water steady layer 32, bituminous paving 33 and afforestation groove 34, road bed course 31, water steady layer 32, bituminous paving 33 are from the lower range upon range of setting in proper order, afforestation groove 34 set up in the top of road bed course 31, and be located the central point of layer 30 of mating formation, the left and right sides of afforestation groove 34 all is provided with water steady layer 32 with bituminous paving 33. The greening grooves mainly play a role in separating road surfaces, and lanes with opposite traffic flow directions are respectively arranged on the road surfaces on two sides of the greening grooves 34.
The roadbed pad layer 31 is made by modifying the expansive soil with geopolymer slurry, wherein the geopolymer slurry is formed by mixing fly ash, silica fume, weak base excitant, glass fiber and water, and the weight ratio of the fly ash, the silica fume, the weak base excitant and the water is as follows: (0.45-0.55): (0.50-0.55): (0.4-0.45): (0.15-0.2), the glass fiber content is 1.5-2% of the total mass of the roadbed cushion layer. The mixing amount of the geopolymer slurry in the roadbed cushion layer is 20% -25% of the total mass of the roadbed cushion layer 31.
The top end of the flexible movable rod 221 is fixed to the subgrade mat 31.
The water stabilization layer 32 is formed by mixing broken stone and geopolymer slurry, and the particle grading ratio of the broken stone is as follows: crushed stone with the particle size of 0 mm-4.75 mm: crushed stone with particle size of 5 mm-10 mm: crushed stone with particle size of 10 mm-15 mm: 10 mm-25 mm particle size crushed stone= (2.0-2.4): (0.8-0.9): (0.8-0.9): (1.6-1.8). The geopolymer slurry is formed by mixing fly ash, silica fume, weak base excitant and water, and the weight ratio of the fly ash is as follows: silica fume: weak base excitant: water= (0.5-0.55): (0.45-0.5): (0.35-0.5): (0.1-0.15), the mixing amount of the geopolymer slurry is 3.5-4.5% of the total mass of the crushed stone.
Through set up the expansion soil bed course that adopts the geopolymer modification in water steady layer 32 bottom to make it combine together with piston stake 20 and constitute the raft structure that is similar to the column board, can effectively avoid because of the uneven emergence that leads to the uneven condition of expansion distribution of expansion soil water content, the road surface that avoids that can be fine takes place to destroy.
The drainage ditches 40 are arranged at the left and right sides of the pavement layer 30, and are used for collecting rainwater which is collected on the asphalt pavement 33 and then intensively discharging; the bottom of stagnant water curtain 50 inserts in the road bed basis 10, top butt the both sides of layer 30 of mating formation, stagnant water curtain 40 is used for the separation layer 30 and escape canal 30 of mating formation, avoid the rainwater in the escape canal 30 to permeate again to layer 30 of mating formation influences the stability of layer 30 of mating formation.
The water-stop curtain wall 50 is constructed by adopting a stirring pile method, the wall thickness of the water-stop curtain wall 50 is 30-50cm, and the depth of the water-stop curtain wall 50 is 0-50cm lower than the pile bottom of the outermost piston pile 20.
The water stop curtain wall 50 is arranged on two sides, the geopolymer modified roadbed cushion layer 31 and the geopolymer water stabilizing layer 32 are arranged on the upper side to isolate water, and the drainage-blocking-prevention water-blocking system is combined with the drainage of the geopolymer concrete piston pile, so that the expansion soil in the range of water infiltration into the roadbed is effectively reduced, and the stability of the roadbed is further improved.
Further, the upper surface of the subgrade cushion layer 31 is provided with a plurality of water collecting pipes 310, the water collecting pipes 310 are transversely arranged along the width direction of the road surface, and the water collecting pipes 310 are equidistantly and alternately arranged along the extending direction of the road surface. The drain pipe 223 positioned at the uppermost position communicates with the water collecting pipe 310, and the water collecting pipe 310 merges into the greening groove 34. And is used for conveying the water in the closed chamber 224 into the greening groove 34 to form irrigation, so that the water resource can be reused. The drain pipes 223 in the plurality of piston piles 20 in the same row merge into the same water collecting pipe 310. The pipe diameters of the drain pipe 223 and the water collecting pipe 310 are the same and are 3-4cm.
Further, the greening groove 34 comprises a U-shaped groove body 341, a water storage tank 342 and a water inlet pipe 343, wherein the U-shaped groove body 341 encloses a landfill space, planting soil is filled in the landfill space, and vegetation is planted on the planting soil; the water storage tank 342 is fixed on the inner side wall of the U-shaped tank 341, the bottom of the water inlet pipe 343 is communicated with the water collecting pipe 310, and the top of the water inlet pipe penetrates through the U-shaped tank 341 to be communicated with the water storage tank 342, so that water is conveyed into the water storage tank 342. The water inlet pipe 343 is located at the top end of the water storage tank 342, so that the water backflow in the water inlet pipe 343 can be limited, and meanwhile, in order to further increase the backflow limiting effect, a matching structure of a blocking ball and an inclined baffle plate can be also arranged in the water inlet pipe 343, so that the water flow of the water inlet pipe 343 can only flow into the water storage tank 342 and cannot flow out of the water storage tank 342 based on the same principle.
The water storage tank 342 is provided with a water seepage hole 345 in a penetrating manner near the side wall of the landfill space, the greening groove 34 further comprises an adjusting sponge 346, the adjusting sponge 346 is fixed with the inner side wall of the water storage tank 342 and completely covers the water seepage hole 345, and the adjusting sponge 346 is used for evenly seeping water in the water storage tank 342 into planting soil and can also play a blocking role to limit backflow of the water.
The water pumped by the water pumping assembly 22 in the piston pile 20 can be directly conveyed to the water storage tank 342 for storage and use, so that the water resource can be reused.
The invention also provides a construction method of the self-adaptive deformation deep expansive soil roadbed structure, which comprises the following steps:
Step one: marking side lines on two sides of a road by using a measuring instrument, cleaning shallow surface soil in a construction range, and marking pile positions of each piston pile;
step two: the method comprises the steps of constructing a water-stopping curtain wall by adopting a stirring pile machine, inserting a piston pile into a roadbed foundation by using a pile driver, coating engine oil on a pile top pipe orifice after the piston pile is installed in place, sealing by adopting a wood board, mixing geopolymer slurry with expansive soil to form a roadbed cushion, paving a water collecting pipe during roadbed cushion construction, cutting a hole body at a pile position where the piston pile is buried after construction is completed, adopting a stepped cutting mode, cutting a large hole at the top, cutting a hole near the pile top position, removing a template sealed at the top after the top of the piston pile is exposed, communicating a drain pipe with the water collecting pipe, and casting geopolymer concrete in the cut hole to fix the top of a flexible movable rod;
step three: installing the prefabricated greening groove in place by adopting hoisting equipment, and communicating the water collecting pipe with the water inlet pipe;
step four: preparing geopolymer slurry and geopolymer slurry, conveying to a construction site, paving a roadbed cushion layer and a water stabilization layer by using a paver, and compacting by using a road roller after finishing paving;
step five: constructing an asphalt pavement by using a paver;
Step six: and excavating a drainage ditch body close to the edge of the roadbed, preparing geopolymer concrete at the same time, and pouring construction after the drainage ditch body is supported.
Compared with the related art, the self-adaptive deformation adjusting of the self-adaptive deformation deep expansive soil roadbed structure provided by the invention realizes the self-adaptive deformation adjusting of expansive soil in a roadbed foundation through the cooperation of the piston piles and the roadbed cushion layers; the geopolymer is used for replacing cement to prepare geopolymer concrete, geopolymer slurry, a geopolymer water stabilization layer and the like, which belong to green environment-friendly materials, so that the dependence of expanded soil roadbed treatment and water stabilization layer construction on traditional cementing materials such as cement and the like is eliminated, and the ecological environment protection is facilitated; on the other hand, the water extracted from the expansive soil layer by the geopolymer concrete piston pile can be stored in a water storage tank of the greening groove, so that the high-efficiency utilization of the water is realized; the construction difficulty is small, the cost is low, and the construction period is short: the geopolymer concrete piston pile can be constructed by referring to prefabricated pipe piles, related components can be produced in batch in a factory, the quality is easy to control, the construction difficulty is low, the popularization is convenient, and because the geopolymer material is adopted for improving the expansive soil and preparing the water stabilization layer, the geopolymer is low in price, the setting and hardening speed is faster than that of cement, the engineering cost can be effectively reduced, and the construction speed is accelerated.
The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.
Claims (7)
1. The self-adaptive deformation deep expansion soil roadbed structure is characterized by comprising a roadbed foundation, a piston pile and a paving layer, wherein the piston pile is arranged in the roadbed foundation, the paving layer is arranged above the roadbed foundation, the piston pile comprises a hollow pile body and a pumping unit, the pumping unit is arranged in a hollow area of the hollow pile body, the pumping unit comprises a flexible movable rod, a piston sealing ring and a drain pipe, the flexible movable rod is arranged along the central axis direction of the hollow pile body, the bottom end of the flexible movable rod is fixed with the bottom end of the hollow pile body, the top end of the flexible movable rod is fixed with the paving layer, the piston sealing ring is sleeved on the flexible movable rod, the outer surface of the piston sealing ring is abutted to the inner wall of the hollow pile body, a plurality of piston sealing rings are sequentially arranged at intervals to divide the hollow area of the hollow pile body into a plurality of closed chambers, a plurality of water inlets are formed in a penetrating way on the side wall of the hollow pile body, the water inlets are communicated with the outer side spaces of the closed chambers and the hollow pile body, two adjacent closed drain pipes are fixedly arranged along the central axis direction of the hollow pile body, the top end of the hollow pile body is fixedly arranged at the bottom end of the hollow pile body, the top end of the hollow pile body is positioned below the hollow pile body, the water sealing ring passes through the top end of the sealing ring, and the top end of the sealing ring is positioned above the sealing ring and is positioned at the top of the sealing ring, and is positioned at the top of the sealing ring and is positioned at the top surface of the top of the sealing layer; the bottom of the drain pipe is close to the side wall of the piston sealing ring below, the paving layer comprises a roadbed cushion layer, a water stabilizing layer, an asphalt pavement and a greening groove, the roadbed cushion layer, the water stabilizing layer and the asphalt pavement are sequentially stacked from bottom to top, the greening groove is arranged above the roadbed cushion layer and is positioned at the central position of the paving layer, the water stabilizing layer and the asphalt pavement are arranged on the left side and the right side of the greening groove, the top of the flexible movable rod is fixed with the roadbed cushion layer, a plurality of water collecting pipes are distributed on the upper surface of the roadbed cushion layer, one drain pipe at the top in the piston pile is communicated with the water collecting pipes, a plurality of drain pipes in the same row of the piston piles are collected in the same water collecting pipes, the tail ends of the water collecting pipes are collected into the greening groove, the greening groove comprises a U-shaped groove body and a water inlet pipe, the U-shaped groove body encloses a filling space, planting soil is filled in the filling space, and vegetation is planted on the planting soil; the water storage tank is fixed in on the groove inside wall of U-shaped cell body, the bottom of water inlet pipe with the collector pipe intercommunication, the top pass the U-shaped cell body with the storage tank intercommunication is carried water in the storage tank, the storage tank is close to run through on the lateral wall in landfill space and be provided with the infiltration hole, the afforestation groove still includes the regulation sponge, the regulation sponge with the inside wall of storage tank is fixed and covers completely the infiltration hole.
2. The adaptively deformed, deep expansive soil subgrade structure of claim 1, wherein said piston piles are distributed in a rectangular array within said subgrade foundation; in the extending direction of the roadbed, a plurality of rows of the piston piles are distributed at equal intervals; 3-5 piston piles are arranged side by side on the section of the roadbed in the width direction, and the pile length is continuously shortened from two sides of the roadbed to the central direction of the roadbed.
3. The adaptive deformation deep expansive soil subgrade structure according to claim 1, characterized in that said water inlet comprises a first horizontal section, an inclined section and a second horizontal section, said first horizontal section being adjacent to the inside of said hollow pile body, said second horizontal section being adjacent to the outside of said hollow pile body, said inclined section connecting said first horizontal section and said second horizontal section and extending obliquely downward from said first horizontal section toward said second horizontal section; a flexible filter screen is arranged in the first horizontal section and covers the whole section of the first horizontal section; a filter plug is arranged in the second horizontal section, and the filter plug covers the whole section of the second horizontal section; the inclined section is internally provided with two inclined baffles and blocking balls, the inclined baffles are in horn mouth design, one small mouth end faces one side of the second horizontal section, and the blocking balls are arranged between the inclined baffles and the flexible filter screen.
4. The adaptive deformation deep expansive soil subgrade structure according to claim 1, further comprising drainage ditches and water stop curtain walls, said drainage ditches being arranged on the left and right sides of said pavement layer for collecting rainwater collected on said asphalt pavement and then discharging the rainwater intensively; the bottom of stagnant water curtain inserts in the road bed basis, top butt the both sides of layer of mating formation, stagnant water curtain is used for the separation layer of mating formation and escape canal.
5. The self-adaptive deformation deep expansive soil roadbed structure according to claim 1, wherein the roadbed cushion is prepared by modifying expansive soil with geopolymer slurry, wherein the geopolymer slurry is prepared by mixing fly ash, silica fume, weak base excitant, glass fiber and water, and the weight ratio of the fly ash, the silica fume, the weak base excitant and the water is as follows: (0.45-0.55): (0.50-0.55): (0.4-0.45): (0.15-0.2), the glass fiber mixing amount is 1.5-2% of the total mass of the roadbed cushion; the mixing amount of the geopolymer slurry in the roadbed cushion layer is 20% -25% of the total mass of the roadbed cushion layer.
6. The self-adaptive deformation deep expansive soil roadbed structure according to claim 1, wherein the water-stable layer is formed by mixing broken stone with geopolymer slurry, and the particle grading ratio of the broken stone is as follows: crushed stone with the particle size of 0 mm-4.75 mm: crushed stone with particle size of 5 mm-10 mm: crushed stone with particle size of 10 mm-15 mm: 10 mm-25 mm particle size crushed stone= (2.0-2.4): (0.8-0.9): (0.8-0.9): (1.6-1.8), wherein the geopolymer slurry is formed by mixing fly ash, silica fume, weak base excitant and water, and the weight ratio of the fly ash is as follows: silica fume: weak base excitant: water= (0.5-0.55): (0.45-0.5): (0.35-0.5): (0.1-0.15), the mixing amount of the geopolymer slurry is 3.5-4.5% of the total mass of the crushed stone.
7. The construction method of the self-adaptive deformation deep expansive soil roadbed structure according to claim 4, comprising the steps of:
Step one: marking side lines on two sides of a road by using a measuring instrument, cleaning shallow surface soil in a construction range, and marking pile positions of each piston pile;
Step two: the method comprises the steps of adopting a stirring pile machine to construct a water stop curtain wall, using a pile driver to insert a piston pile into a roadbed foundation, coating engine oil on a pile top pipe orifice after the piston pile is installed in place, sealing by adopting a wood board, mixing geopolymer slurry with expansive soil to form a roadbed cushion, paving a water collecting pipe during roadbed cushion construction, drilling a hole body at a pile position where the piston pile is buried after construction is completed, adopting a stepped cutting mode, drilling a large hole at the top, reducing the drilling hole near the pile top position, removing a template sealed at the top of the piston pile after the top of the piston pile is exposed, communicating the water discharging pipe with the water collecting pipe, and casting geopolymer concrete in the drilling hole to fix the top of a flexible movable rod with the roadbed cushion into a whole;
step three: installing the prefabricated greening groove in place by adopting hoisting equipment, and communicating the water collecting pipe with the water inlet pipe;
Step four: paving a water stabilizing layer and an asphalt pavement by adopting a paver;
step five: and excavating and pouring a drainage ditch close to the edge of the roadbed, and completing construction.
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