CN115305757B - Metamaterial roadbed and construction method thereof - Google Patents
Metamaterial roadbed and construction method thereof Download PDFInfo
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- CN115305757B CN115305757B CN202111608043.4A CN202111608043A CN115305757B CN 115305757 B CN115305757 B CN 115305757B CN 202111608043 A CN202111608043 A CN 202111608043A CN 115305757 B CN115305757 B CN 115305757B
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- 238000010276 construction Methods 0.000 title abstract description 15
- 229920001971 elastomer Polymers 0.000 claims abstract description 78
- 239000010881 fly ash Substances 0.000 claims abstract description 53
- 230000002787 reinforcement Effects 0.000 claims abstract description 46
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 16
- 239000013078 crystal Substances 0.000 abstract description 8
- 238000013016 damping Methods 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000001066 destructive effect Effects 0.000 abstract description 3
- 201000010099 disease Diseases 0.000 description 4
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000000411 transmission spectrum Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
Classifications
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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
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
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- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a metamaterial roadbed and a construction method thereof. A metamaterial roadbed comprises a pavement structure layer and a roadbed layer and is characterized in that: the roadbed layer comprises a plurality of fluid fly ash roadbed layers and a plurality of rubber reinforcement layers, and the rubber reinforcement layers and the fluid fly ash roadbed layers are alternately arranged from bottom to top and are periodically distributed. According to the invention, based on the phonon crystal theory, the rubber reinforcement layer and the fluid fly ash roadbed layer are periodically arranged in the roadbed layer, when vibration waves in the roadbed propagate, due to the phonon crystal Bragg scattering effect, the vibration waves in the roadbed have longitudinal and transverse wave waveform conversion at the interface between the fly ash and the rubber material, destructive interference occurs, a vibration reduction band gap is generated, vibration energy is dissipated, so that the roadbed has remarkable low-frequency vibration reduction performance, and the damage of road traffic vibration to the surrounding environment and road structure safety can be effectively reduced. The metamaterial roadbed has the advantages of light weight, good vibration damping performance, easiness in construction and low cost.
Description
Technical Field
The invention relates to a metamaterial roadbed, and belongs to the technical field of roadbeds. The invention also relates to a construction method of the metamaterial roadbed
Background
In road traffic engineering, due to the reasons of uneven road surface, vibration of a vehicle engine, concave-convex surface of a tire, acceleration and deceleration of a vehicle and the like, the vehicle can impact the road surface in the running process to excite the whole road surface structure to generate vibration. The vibration is transmitted downwards to the roadbed from the road surface and is transmitted to the periphery through the soil body of the roadbed, so that secondary vibration and noise of the surrounding environment are further induced, and the influence on the work and life of nearby buildings and people is generated.
Road traffic vibration can adversely affect the surrounding environment and road structure safety: (1) The safety of nearby buildings and the comfort of nearby residents are affected, as the urban roads crossing underground space structures are arranged, road traffic operation can cause vibration safety problems of the underground space structures, human attention transfer, work efficiency reduction and the like, foreign related researches show that vexation effects of people on vibration are quite consistent with feeling of vibration, road traffic vibration causes resonance effects of internal organs of the human body, so that long-term micro-amplitude vibration can also bring serious influence on work and life of people, and even permanent pathological damage of the human body is caused when the vibration is too strong; (2) Influencing the normal operation of nearby precision instruments, such as Transmission Electron Microscopes (TEMs) configured for measuring mass in the New Pudong zone of the Ulma, which allows for a vibration acceleration root mean square value of 0.3mm/s 2 Traffic vibration generated by actually measuring the people's western roads in the vicinity exceeds the standard value, and necessary vibration reduction measures are needed to be adopted, so that the accurate instrument can work normally; (3) Road traffic vibration can cause engineering disasters such as uneven deformation and stability of roads, such as expressways crossing silt and silt regions, under the reciprocating action of traffic load, the vibration is transmitted to a saturated silt foundation at the lower part to cause hyperstatic pore water pressure increase, and the action time of the traffic load is shortMoreover, the hyperstatic pore water pressure is frequently accumulated gradually because of being unable to be dissipated in time, and the saturated silt is possibly liquefied, so that the effective stress of the soil is reduced, and the structural safety problems of subgrade settlement deformation, stability and the like are caused. Therefore, it is necessary to take effective measures to control harmful vibrations generated by road traffic.
In order to solve the problems, the existing vibration reduction measures mainly control the vibration source, cut off the vibration propagation path and protect the vibrated building, such as adopting a light vehicle body and improving the road surface flatness, arranging a vibration isolation ditch or adopting a rubber asphalt vibration reduction road surface, arranging a vibration isolation foundation for the building and the like, and achieve certain effects. However, the existing vibration reduction measures have more or less defects, such as concave-convex and broken pavement and the like along with the increase of the road operation time, and the vibration reduction performance of the pavement is reduced, so that new vibration diseases are caused; the vibration reduction effect of the rubber asphalt pavement is still not ideal due to the bearing capacity requirement; for crossing urban roads, the vibration isolation trench is difficult to set and is easy to damage due to limited building space; in road traffic, in order to prevent liquefaction of roadbed soil, most of the prior main solutions adopt a composite foundation form, but the method has high cost and long construction period, and greatly increases engineering construction and operation costs. Therefore, a novel vibration reduction method for controlling road traffic vibration diseases is needed.
The phonon crystal metamaterial is a novel artificial composite material developed in recent years, and is generally formed by two or more materials which are arranged according to a certain periodicity, and is characterized in that the propagation of elastic waves in the material can be regulated and controlled, so that the elastic waves in a specific frequency range (called phonon crystal Band gap) cannot propagate, and the purposes of vibration reduction and vibration isolation are achieved. The phonon crystal metamaterial can realize vibration reduction by utilizing the material, has good material integrity and does not damage the connectivity of the material, and has remarkable advantages compared with the traditional vibration reduction method.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the metamaterial roadbed which has good vibration damping performance and has the advantages of light weight, easy construction, low cost and the like, and can effectively control road traffic vibration and improve the operation safety and quality of the roadbed.
The invention is realized by the following technical scheme: a metamaterial roadbed comprises a pavement structure layer and a roadbed layer and is characterized in that: the roadbed layer comprises a plurality of fluid fly ash roadbed layers and a plurality of rubber reinforcement layers, and the rubber reinforcement layers and the fluid fly ash roadbed layers are alternately arranged from bottom to top and are periodically distributed.
The invention is based on phonon crystal theory, through setting up multilayer rubber and adds muscle layer and multilayer flow state fly ash road base layer in the road bed layer periodically, the material parameter of rubber adds muscle layer and flow state fly ash has great difference, when the vibration wave in the road bed propagates, because phonon crystal Bragg scattering effect, there is the wave form conversion of vertical and horizontal wave in the road bed internal vibration wave at fly ash and rubber material interface department, and take place destructive interference, produce the vibration band gap, vibration energy is dissipated, make the road bed have apparent low frequency vibration damping performance, can reduce road traffic vibration to the harm of surrounding environment and road structure safety effectively. Meanwhile, as the density of the fluid fly ash and the rubber material is small, the construction is easy, the uneven settlement deformation of the roadbed can be effectively controlled, and the application effect is obvious especially for bridge abutment back engineering sections which are easy to cause diseases such as differential settlement after construction and bridge head jumping.
Further, the fluid fly ash road base layer is prepared from industrial fly ash, cement, water and an additive according to a proportion.
Further, the thickness of the fluid fly ash road base layer is 40-60cm, and the density is 1200-1600kg/m 3 . The fluid fly ash road base layer has the characteristic of light weight and compaction free.
Further, for playing reliable reinforcement effect to the road base, improve road bed stability, rubber reinforcement layer adopts the long rectangular horizontal cross of being laid of rubber to form, adopts U type steel nail to fix rubber reinforcement layer at the base surface in the overlap joint department and the cross coincide department of long strip of rubber.
Further, in order to improve the reinforcement effect of the rubber reinforcement layer, the distance between adjacent rubber strips is 3-6cm.
Further, the rubber strip used in the rubber reinforcement layer has a thickness of 2-4cm, a width of 4-6cm and a length of more than or equal to 100cm.
Further, the cross section of the roadbed is in the form of a embankment or a cutting or a half-cut roadbed.
The invention also provides a construction method of the metamaterial roadbed, which adopts the following technical scheme: the method comprises the following steps:
a. and (3) foundation treatment: leveling or excavating and tamping the foundation;
b. paving a rubber reinforcement layer (3) on the tamped foundation, and fixing the rubber reinforcement layer on the surface of the foundation by adopting U-shaped steel nails;
c. cleaning a substrate, supporting a template in the middle of a roadbed, pouring a fluid fly ash roadbed layer, pouring and layering, pouring an upper layer before the lower layer fly ash is initially set or remolded, and manually assisting to strickling to 2% of a transverse slope by using a scraper;
d. naturally airing the fluid fly ash roadbed layer, paving a rubber reinforcement layer after natural strength is formed and the fluid fly ash roadbed layer is cracked, and fixing the rubber reinforcement layer on the surface of the fly ash roadbed layer by adopting U-shaped steel nails;
e. repeating the steps c and d until the roadbed design height is reached;
f. and (3) curing the roadbed to a preset age, so that the roadbed meets the road performance requirement.
Further, when the fluid fly ash road base layer is poured, the fluidity measured by a mortar consistometer is controlled to be 13-15cm.
The beneficial effects of the invention are as follows: (1) According to the invention, the multi-layer rubber reinforcement layer and the multi-layer fluid fly ash road base layer are periodically arranged from bottom to top, and due to the Bragg scattering effect of phonon crystals, longitudinal and transverse wave waveform conversion exists at the interface of the fly ash and the rubber material in the road bed, destructive interference occurs, a vibration-damping band gap is generated, and vibration energy is dissipated, so that the road bed has obvious low-frequency vibration-damping performance, and the damage of road traffic vibration to the surrounding environment and road structure safety can be effectively reduced;
(2) The roadbed can realize vibration reduction by utilizing the roadbed, so that good integrity of the roadbed can be ensured and the connectivity of materials can not be damaged;
(3) The fluid fly ash and the rubber reinforced material adopted by the invention have low density and are easy to construct, so that the metamaterial roadbed has the characteristics of light weight and high strength, and the uneven settlement deformation of the roadbed can be effectively controlled. In addition, the fluid fly ash has the advantages of no vibration and the like, and has obvious application effect particularly on bridge abutment back engineering sections which are easy to cause diseases such as differential settlement after construction, bridge head jumping and the like;
(4) The rubber reinforcement layer is made of the rubber strip, the rubber strip is paved in the roadbed in a horizontal cross manner, and is fixed on the surface of the substrate through the U-shaped steel nails, so that the reinforcement effect on the roadbed is achieved, and the stability of the roadbed can be remarkably improved;
(5) The roadbed material can be prepared into a fluid fly ash material meeting the road performance by utilizing industrial fly ash, and a rubber strip material meeting the requirements can be prepared by utilizing waste tires, so that the resource utilization of the waste materials is realized while the mass production is realized, the roadbed material is green and environment-friendly, the economic cost of the material is obviously reduced, compared with the method for solving the problem of liquefaction of foundation soil and the like by adopting a vertical composite foundation form in engineering, the engineering construction and operation cost is greatly reduced, the national policy requirements on energy conservation, emission reduction and solid waste comprehensive utilization are met, and the roadbed material has obvious economic and social benefits.
Drawings
FIG. 1a is a schematic cross-sectional view (in section form of a embankment) of a metamaterial subgrade structure of the present invention;
FIG. 1b is a schematic cross-sectional view (in section form of a half-cut and half-fill) of a metamaterial subgrade structure according to the present invention;
FIG. 1c is a schematic cross-sectional view (in the form of a cutting) of the metamaterial roadbed structure of the present invention;
FIG. 2a is a schematic top view of a rubber reinforcement layer in an embodiment of the present invention;
FIG. 2b is a schematic illustration of the connection where the rubber reinforcement layers overlap and cross-stitch in section 3-3 of FIG. 2 a;
FIG. 3 is a schematic cross-sectional view of a single cell model of the metamaterial subgrade of the present invention;
FIG. 4 is a band structure diagram of transverse wave propagation in a metamaterial subgrade in accordance with an embodiment of the present invention;
FIG. 5 is a transverse wave transmission spectrum calculated using a finite element method in an embodiment of the present invention;
in the figure, 1, a pavement structure layer, 2, a fluid fly ash pavement layer, 3, a rubber reinforcement layer, 3-1, a substrate surface, 3-2, rubber strips, 3-3, a lap joint and a cross lamination part of the rubber strips, 3-4, U-shaped steel nails and 4, and a natural ground.
Detailed Description
The invention is further illustrated by the following non-limiting examples, in conjunction with the accompanying drawings:
as shown in fig. 1a, 1b and 1c, a metamaterial roadbed comprises a pavement structure layer 1 and a roadbed layer. The cross section forms of the metamaterial roadbed comprise three forms of embankment, cutting and half-cut and half-fill.
The single cell model of the metamaterial roadbed is shown in fig. 3, and is a basic unit for forming the roadbed layer of the present invention, and comprises a fluidized fly ash roadbed layer 2 and a rubber reinforcement layer 3. The thickness of the unit cell model is called a lattice constant a, and the lattice constant a and the thickness of each layer are determined by the specific requirements of vibration reduction and construction processes.
The unit cell models are arranged periodically along the vertical direction to form the road base layer of the invention, and as shown in fig. 1a, 1b and 1c, a plurality of rubber reinforcement layers 3 and a fluid fly ash road base layer 2 are arranged from bottom to top; the rubber reinforcement layers 3 and the fluid fly ash road base layers 2 are alternately arranged and periodic; in fig. 1a, 1b, and 1c, the number of the unit cell models is referred to as a period, and n represents n, and the height of the metamaterial roadbed with n periods is n×a.
The fluid fly ash road base layer 2 is prepared from industrial fly ash, cement, water and an additive in proportion, and is prepared from the following components in percentage by mass: and (3) cement: the fly ash is 6:94-10: 90. the additive is 1-2%, the water mixing amount is 40-50%, and the additive is polycarboxylate water reducer, thickener, etc. The material performance meets the road requirement, the 7-day strength is not lower than 0.4MPa, the 28-day strength is not lower than 0.8MPa, and Yang ShimoIn an amount of 10 8 -10 9 And Pa level.
Preferably, the thickness of the fluid fly ash road base layer 2 is 40-60cm, and the density is 1200-1600kg/m 3 。
The rubber reinforcement layer 3 is made of rubber material, and generally has a low Young's modulus of 10 5 -10 6 And Pa level. The rubber reinforcement layer and the roadbed are paved in the same width, the rubber reinforcement layer 3 is preferably formed by paving rubber strips in a horizontal cross shape, and U-shaped steel nails 3-4 are adopted at the lap joint and the cross superposition of the rubber strips to fix the rubber reinforcement layer 3 on the surface of the substrate (the foundation or the fluid fly ash roadbed). The lap joint length of the rubber strip in the transverse direction (perpendicular to the longitudinal axis of the road) is more than or equal to 15cm, and the lap joint length in the longitudinal direction (parallel to the longitudinal axis of the road) is more than or equal to 10cm. The rubber strip can be made of raw materials such as junked tire rubber.
In order to enhance the reinforcement effect of the rubber reinforcement layer, it is preferable that the spacing between adjacent rubber strips is 3-6cm.
Preferably, the rubber strip used in the rubber reinforcement layer 3 has a thickness of 2-4cm, a width of 4-6cm and a length of more than or equal to 100cm.
The construction method of the metamaterial roadbed comprises the following steps:
a. and (3) foundation treatment: leveling or excavating and tamping the foundation;
b. the rubber strip is paved on the treated foundation, the foundation is straightened and smooth when paved, the foundation surface is tightly attached, no twisting, wrinkling and overlapping are caused, the rubber strip can be horizontally crossed paved in the roadbed, the lap joint is fixedly connected by adopting U-shaped steel nails 3-4, the lap joint length is more than or equal to 15cm, the lap joint length in the longitudinal direction (parallel to the longitudinal axis of the road) is more than or equal to 10cm, the distance between the adjacent rubber strips is 3-6cm, and finally the rubber reinforcement layer 3 with the same width as the roadbed is formed. And fixing the lapped rubber reinforcement layer 3 on the surface of the substrate by adopting U-shaped steel nails 3-4 at the lap joint and the cross lamination of the rubber strips of the rubber reinforcement layer 3.
c. Cleaning a substrate, supporting a template in the middle of a roadbed, pouring a fluid fly ash roadbed layer 2, pouring and layering, pouring an upper layer before the lower layer fly ash is initially set or remolded, and manually assisting to strickling to 2% of a transverse slope by using a scraper. Preferably, when the fluid fly ash road base layer is poured, the fluidity measured by a mortar consistometer is controlled to be 13-15cm.
d. B, after natural strength is formed and the fluid fly ash roadbed layer 2 is cracked, paving rubber strips in the step b to form a rubber reinforcement layer 3, and fixing the rubber reinforcement layer 3 on the surface of the fly ash roadbed layer by adopting U-shaped steel nails 3-4.
e. Repeating the steps c and d until the roadbed design height is reached;
f. and (3) preserving the roadbed to a preset age, so that the roadbed meets the road performance requirements.
The invention is further illustrated by the following specific examples:
the main frequency of vibration generated by road traffic is typically 10-200Hz, and vibration of this particular frequency needs to be damped. In this embodiment, the lattice constant a of a metamaterial roadbed is generally 0.4-0.6m, a=0.5m is calculated in this embodiment, the period number n is generally 4-8, and n=6 is calculated in this embodiment; the thickness of the rubber reinforcing layer 3 is generally 0.02-0.04m, the Young's modulus is generally 10 when calculated in this example to be 0.03m 5 -10 6 Pa, 1.175×10 is calculated in this example 5 Pa, its density is typically 1200-1400kg/m 3 1300kg/m was taken during the calculation in this example 3 The poisson ratio is generally 0.46 to 0.47, and 0.47 is taken when the calculation is carried out in the embodiment; the thickness of the fluid fly ash road base layer 2 is generally 0.4-0.6m, the Young's modulus is generally 10 when the thickness is 0.47m 8 -10 9 Pa, 0.521×10 is calculated in this example 9 Pa, the Poisson's ratio is generally 0.45-0.46, and 0.45 is calculated in this example.
Based on the elastic wave one-dimensional vibration equation, a vibration characteristic frequency-wave vector relation (f-q) curve of the metamaterial roadbed can be calculated, and the relation curve is called an energy band structure. In theory, elastic waves in a frequency range corresponding to the no-band curve cannot pass through the material, and thus the material has a damping effect on elastic waves in the frequency range, which is generally referred to as a band gap or a damping band gap. The energy band structure of transverse wave propagation calculated in this embodiment is shown in fig. 4, in which the abscissa is wave vector q, the ordinate is frequency f, the frequency range corresponding to the shaded portion is band gap, and elastic waves in the frequency range cannot propagate inside the metamaterial roadbed, so that the metamaterial roadbed has a vibration reduction effect. As shown in fig. 4, three obvious band gaps are formed in 200Hz, namely 14-92Hz, 95-184Hz and 186-200Hz, and the band gaps can effectively cover the main frequency range of road traffic vibration, so that the metamaterial roadbed can effectively attenuate the road traffic vibration.
Fig. 5 is a vibration transmission spectrum of the 6-period metamaterial roadbed calculated by using a finite element method in the embodiment, and as can be seen from the drawing, a transmission spectrum curve shows good absorption characteristics for transverse waves in a band gap range corresponding to an energy band structure curve chart 4. In the embodiment, the height of the 6-period metamaterial roadbed is 3m, the transmittance of each band gap respectively reaches-50 dB, -100dB and-150 dB, and the 6-period metamaterial roadbed has excellent low-frequency vibration reduction effect.
Other parts in this embodiment are all of the prior art, and are not described herein.
Claims (4)
1. The metamaterial roadbed comprises a pavement structure layer (1) and a roadbed layer and is characterized in that: the roadbed layer comprises a plurality of layers of fluid state fly ash roadbed layers (2) and a plurality of layers of rubber reinforcement layers (3), and the rubber reinforcement layers (3) and the fluid state fly ash roadbed layers (2) are alternately arranged from bottom to top and are periodically distributed; the thickness of the fluid fly ash road base layer (2) is 40-60cm, and the density is 1200-1600kg/m 3 Young's modulus of 10 8 -10 9 Pa, poisson's ratio is 0.45-0.46; the thickness of the rubber strip adopted by the rubber reinforcement layer (3) is 2-4cm; the fluid fly ash road base layer (2) is prepared from industrial fly ash, cement, water and an additive in proportion, wherein the proportion is as follows by mass: and (3) cement: the fly ash is 6:94-10: 90. the additive is 1-2%, the water mixing amount is 40-50%, the additive is a polycarboxylate water reducer and a thickener; the rubber reinforcement layer (3) is formed by horizontally and cross-shaped paving of rubber strips, and U-shaped steel nails are adopted at the lap joint position and the cross superposition position of the rubber strips to fix the rubber reinforcement layer on the surface of the substrate; adjacent rubberThe distance between the long strips is 3-6cm.
2. The metamaterial subgrade according to claim 1, wherein: the rubber strip adopted by the rubber reinforcement layer (3) has the width of 4-6cm and the length of more than or equal to 100cm.
3. The metamaterial subgrade according to claim 1, wherein: the cross section of the roadbed is in the form of a embankment or a cutting or a half-cut roadbed.
4. A method of constructing a metamaterial subgrade as claimed in any one of claims 1 to 3, wherein: the method comprises the following steps:
a. and (3) foundation treatment: leveling or excavating and tamping the foundation;
b. paving a rubber reinforcement layer (3) on the tamped foundation, and fixing the rubber reinforcement layer (3) on the surface of the foundation by adopting U-shaped steel nails (3-4);
c. cleaning a substrate, supporting a template in the middle of a roadbed, pouring a fluid fly ash roadbed layer (2), pouring and layering, pouring an upper layer before the lower layer fly ash is initially set or remolded, and manually assisting to stricken to 2% of a transverse slope by using a scraper;
d. naturally airing the fluid fly ash roadbed layer (2), paving a rubber reinforcement layer (3) after natural strength is formed and the fluid fly ash roadbed layer is cracked, and fixing the rubber reinforcement layer (3) on the surface of the fly ash roadbed layer by adopting U-shaped steel nails (3-4);
e. repeating the steps c and d until the roadbed design height is reached;
f. curing the roadbed to a preset age, and enabling the roadbed to meet the road performance requirements;
when the fluid fly ash road base layer (2) is poured, the fluidity measured by a mortar consistometer is controlled to be 13-15cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111608043.4A CN115305757B (en) | 2021-12-23 | 2021-12-23 | Metamaterial roadbed and construction method thereof |
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| CN202111608043.4A CN115305757B (en) | 2021-12-23 | 2021-12-23 | Metamaterial roadbed and construction method thereof |
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| CN115305757A CN115305757A (en) | 2022-11-08 |
| CN115305757B true CN115305757B (en) | 2024-03-26 |
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| CN112553977A (en) * | 2020-12-03 | 2021-03-26 | 同济大学 | Steel rail dynamic vibration absorber and application thereof |
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| JP4082508B2 (en) * | 2003-08-20 | 2008-04-30 | 株式会社河本建築事務所 | Method for producing coal ash concrete and method for producing pavement structure using coal ash |
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| CN200952106Y (en) * | 2006-10-09 | 2007-09-26 | 秦先锋 | Express way utilizing powder coal ash on roadbed |
| CN105350403A (en) * | 2015-09-30 | 2016-02-24 | 同济大学 | Track board with periodic structure characteristics and track board damping system |
| CN107165013A (en) * | 2017-06-02 | 2017-09-15 | 东南大学 | Geotechnical grid reinforcement foam concrete light road foundation fills structure and its method |
| CN207878201U (en) * | 2018-01-08 | 2018-09-18 | 河北德瑞公路工程有限公司 | A kind of civil grille of road construction |
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