CN207749370U - A kind of novel railway sub-grade surface structure - Google Patents

A kind of novel railway sub-grade surface structure Download PDF

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CN207749370U
CN207749370U CN201721791864.5U CN201721791864U CN207749370U CN 207749370 U CN207749370 U CN 207749370U CN 201721791864 U CN201721791864 U CN 201721791864U CN 207749370 U CN207749370 U CN 207749370U
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layer
asphalt
bituminous concrete
macadam
closely knit
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陈先华
徐琪烽
黄卫
杨军
符庆宏
徐刚
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Southeast University
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Southeast University
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Abstract

The utility model discloses a kind of novel railway sub-grade surface structures, suitable for high-speed railway or Special Railway Line for Passenger Transportation surface layer of subgrade bed, it is laid between ballastless track structure supporting course and bottom layer of subgrade, the structure includes from top to bottom asphalt macadam drainage blanket, adhesive layer, the closely knit freeze proof layer of bituminous concrete waterproof of tunneling boring.Direct driving force sphere of action under line is quickly discharged using the big porosity and excellent permeability of asphalt macadam drainage blanket in precipitation by the utility model, recycle the closely knit bituminous concrete with certain transverse slope that roadbed range is laterally discharged from bituminous concrete layer surface in the water oozed under bituminous macadam gap, good freeze proof protection is provided for bottom layer of subgrade, effectively solve ballastless track roadbed surface area water, cement concrete water proof layer premature failure fail with graded broken stone bedding rise soil destroy subgrade stability the problems such as, improve sub-rail foundation structure drainage performance and long-time stability, it is ideal long-acting railway sub-grade surface layer design scheme.

Description

A kind of novel railway sub-grade surface structure
Technical field
The present invention relates to the processing of high-speed railway subgrade guarded drainage and supporting structures, and in particular to a kind of novel railway sub-grade Surface structure.
Background technology
In recent years, China express railway is rapidly developed with passenger dedicated railway line, and basis of the roadbed as railroad track is put down Pliable, uniformity and long-time stability are for ensuring that bullet train safe operation is most important.Existing ballastless track of high-speed railway Structure is followed successively by from top to bottom:Fragment-free track slab and buffer layer, base board(Armored concrete), surface layer of subgrade bed(Graded broken stone)、 Bottom layer of subgrade and subgrade soil;The bearing capacity of high ferro roadbed and long-term steady is influenced to prevent rainfall and surface water from entering roadbed ontology It is qualitative, for, with curb part, fiber concrete layer being usually arranged to realize that the water-protected enclosure to bedding is protected between line, while Sump and transverse drain are set at certain intervals between line so that roadbed is discharged in rainwater between line.
High ferro Construction Practice for many years shows to limit due to construction technology, and graded broken stone layer is more difficult when practice of construction ensures In optimum moisture content, bearing capacity is not readily reachable by optimization, causes the longitudinal supporting rigidity that roadbed is provided uneven, and Profile pattern is difficult to control;To increase the bearing capacity and globality of surface layer of subgrade bed graded broken stone, admixture is also used in engineering The measure of a certain amount of cement, this causes, and the rigidity of graded broken stone layer increases, crack resistance and permeability are affected.And it integrates Existing high speed traffic-operating period sees that its fiber concrete water-protected enclosure layer of the high ferro circuit much runed has cracking, breakage etc. The disease of waterproof effect is influenced, the diseases such as more serious dusting, peeling even occurs in part paragraph, and repairs difficult;It is many high Phenomena such as iron exposes more universal interlayer gap with Line for Passenger Transportation paragraph, purt is starched, in seasonal frost region, many circuits also monitor To certain frost failure, this brings potential threat to the maintenance of track structure and train driving ride comfort.To find out its cause, due to The infiltration coefficient of graded broken stone layer exists compared with Big mutation rate, and the practical effect that seeps water is poor, and fiber concrete waterproof layer because easy to crack and The problems such as being not easily repaired causes local waterproof effect poor, under condition of raining, the moisture that is oozed under interlayer gap, crack etc. into It cannot be discharged in time after entering surface layer of subgrade bed, easily reach saturation state and form local water pocket, under bullet train dynamic loading It may cause the diseases such as bedding softening transform, purt slurry, further result in base board plat-bottom escape.In bedding graded broken stone layer surface Tunneling boring is laid with the excellent compact type bituminous concrete of water resistance to replace the existing local waterproof based on fiber concrete layer Closure solutions efficiently solve the problems, such as that fiber concrete waterproof effect caused by cracking resistance frost resistance is not good enough, are graded broken stone Layer and its lower structure provide more structurally sound waterproofing protection;But the problems such as thoroughly solving bedding softening transform, purt slurry, improves roadbed The uniformity of longitudinal bracing rigidity needs integrated use material, structure and specific aim process means, to surface layer of subgrade bed and its attached The waterproof and drainage design of structure carries out system optimization with structure design.
Highway engineering field practice have shown that, asphalt macadam have preferable Penetration Signature, through reasonable design and implementation Bituminous macadam has stronger structural-load-carrying capacity and weatherability, it is possible to provide suitable with the existing graded broken stone layer of roadbed roadbed Elasticity, and freeze proof crack resistance and globality are more preferable;Closely knit bituminous concrete through rational planning and construction has excellent power Learn intensity, water proofing property, freeze proof crack resistance and durability;In addition, the production of asphalt macadam and compact type bituminous concrete layer, paving Fully-mechanized construction is carried out using existing asphalt concrete construction machinery with rolling, quick and quality of constructing is more uniformly distributed can It leans on.It is broken with globality, permeability and the grading on freeze proof crack resistance better bituminous macadam substitution high ferro subgrade bed surface layer Rock layers realize that the moisture of track structure lower part quick seepage flow while being arranged at graded broken stone layer bottom with the close of larger transverse slope downwards Full mold asphalt concrete layer realizes the laterally quickly discharge of lower infiltration point, this fundamentally changes existing high ferro road structure Guarded drainage mode.Because of the presence of a large amount of connectivity gaps, in the structure for having the apparent gradient, the water of bituminous macadam is in gravity Lower rapid outflow, is not easy to reach saturation state, efficiently avoids the generation flowing pressure under bullet train dynamic loading and draws The diseases such as the roadbed softening transform, the purt slurry that rise, at the same downwards the water of seepage flow through closely knit bituminous concrete surface to both sides discharge path Based structures avoid impacting substructure.Due to the variation of track structure range internal drainage mode, without such as Traditional foundations Sump is set between structure is online like that, this can further speed up construction speed, save engineering-built cost.
Currently, pitch class material in newly-built high-speed railway using less, corresponding structure type is also more single, and having must A kind of the ballastless track roadbed surface bearing protective layer structure and laying method of guarded drainage are proposed for this kind of material, pushed away with science Application of the dynamic future pitch class material in railway.Roadbed knot is can effectively improve using asphalt macadam and closely knit bituminous concrete The guarded drainage performance of structure, while the bearing capacity of roadbed is improved, in terms of construction technology, asphalt concrete construction is convenient, compactness And flatness is controllable, for ease of maintenaince, can improve the globality of rail inferior portion foundation structure, improve foundation bed structure by Lixing For.
Invention content
The invention discloses a kind of novel railway sub-grade surface structures, are suitable for high-speed railway, Line for Passenger Transportation or heavy duty Railway bed surface layer of subgrade bed guarded drainage and supporting role, using big gap asphalt macadam and closely knit bituminous concrete composite structure generation For the cement concrete water proof layer and graded broken stone surface layer of subgrade bed of traditional ballastless track structure, ballastless track roadbed table is effectively solved Area water, the failure of cement concrete water proof layer premature failure and graded broken stone bedding destruction subgrade stability etc. of rising soil are asked Topic, improves the drainage performance and long-time stability of sub-rail foundation structure, while providing good supporting for ballastless track structure, Maintenance cost is reduced, is ideal long-acting railway sub-grade surface layer design scheme.
To achieve the above object, the technical solution adopted by the present invention is:
A kind of novel railway sub-grade surface structure, it is characterised in that:Include from top to bottom asphalt macadam drainage blanket, bonding Layer and closely knit bituminous concrete waterproof layer, utilize the water proofing property of the drainage performance and closely knit bituminous concrete of big gap asphalt macadam Surface layer of subgrade bed precipitation can be quickly discharged to ballastless track structure, the asphalt macadam and closely knit bituminous concrete include that SBS is modified Pitch, specialist additive, aggregate, fine aggregate and filler, the adhesive layer use cationic emulsified bitumen or modified emulsifying asphalt.
Specifically, the adhesive layer is formed by binder spread, binder is that cationic emulsified bitumen or modified emulsifying drip Blueness, adhesion coating pitch should be not less than 0.2MPa with the adhesion strength of concrete and asphalt, and interlaminar shear strength is not less than 0.6MPa。
The asphalt macadam drainage blanket is the asphalt treated permeable layer of 15 ~ 30cm thickness, and nominal maximum particle diameter is 19- 31.5mm, closely knit bituminous concrete waterproof layer are the bituminous concrete waterproof layer of 5 ~ 10cm thickness, and nominal maximum particle diameter is 13- 16mm。
The asphalt macadam and bituminous concrete mixed by heat, paved, roller-compaction.
In the asphalt macadam and bituminous concrete each size coarse aggregate be meeting of being process of impact crushing it is existing The fine and close igneous rock of row technical specification gathers materials, and cleaning, dry, grain shape is good, grading is good.
Fine aggregate in the asphalt macadam and bituminous concrete is the basalt or limestone aggregates of rolling, clean, dry Dry, weather resistance, grading be good, grain size.
Filler in the asphalt macadam and bituminous concrete is limestone through levigate obtained miberal powder, and 0.075mm's is logical Excessive to be not less than 75%, plasticity index is not more than 4.
Pitch in the asphalt macadam and bituminous concrete uses the SBS modified pitch of 3.0 ~ 9.0mm of needle penetration, it is desirable that The elastic restoration ratio of modified pitch is not less than 80%.Asphalt content is 2.8% ~ 4.8% in asphalt macadam, and bituminous concrete pitch is used Amount is 4.8% ~ 6.8%.
Specialist additive in the asphalt macadam and bituminous concrete is used to adjust the elasticity modulus of bituminous concrete, resistance Damping characteristics and deformability, temperature stability, fatigue strength, ageing resistance, the water resistant of reinforcing material damage ability;Appearance is yellowish Color or black particle, proportion are 0.95 ~ 1.10g/cm3, soften 110 ~ 150 DEG C of section, specialist additive is in asphalt macadam and drip Green concrete direct plunges into during mixing and stirring and carries out mix in mixing building, and volume is the 4% ~ 10% of asphalt content.
The asphalt macadam grading uses the gradation design method of multi-grade stone-stone, makes coarse aggregate in the asphalt of design Good embedded squeezing structure is formed, while control 2.36mm, 4.75mm sieve pore passes through percentage so that the grading of design meets mesh Voidage requirement is marked, asphalt content range is determined according to wax deposition volume and dispersion test, and with reference to Marshall stability test knot Fruit determines that the asphalt optimum content of drainage asphalt mixture, voidage should be controlled 7% ~ 15%.
The bituminous concrete is designed using volumetric method, voidage 1-3% and void in mineral aggregate 11% ~ 16%, performance requirement For:Marshall stability is not less than 10kN, and low-temperature bending strain is not less than 2500 μ ε, and linear contractive quotiety is not more than 30 μm/(m DEG C), dynamic modulus is not less than 10000MPa at 15 DEG C, and dynamic modulus is not less than 2000MPa at 40 DEG C, 0.1MPa at 40 DEG C, 10Hz, 1,000,000 dynamic compression creeps accumulated deformation be no more than 1mm, 10Hz, 200 μm of fatigue lives are more than 100 when room temperature Ten thousand times, freeze-thaw split intensity ratio is not less than 85%.
A kind of novel high speed railway sub-grade surface structure laying method, includes the following steps:
(1)It is smooth and clean bottom layer of subgrade top surface, spray 1.0 ~ 2.0kg/m2Split type emulsified asphalt or modified emulsifying soon Pitch begins preparing for the construction of waterproof layer after the not viscous wheel of pitch to be emulsified;
(2)Using the compact type bituminous concrete needed for mixing building mix, concrete technology is:First into mixing building by than Example puts into each grain size and gathers materials, and after specialist additive dry mixing at least 15s then is added, is mixed again after sequentially adding filler and pitch It closes, total duration of mixing is no less than 60s, and drop temperature is maintained at 175 DEG C ~ 190 DEG C;
(3)Using the dump truck transport mix with waterproof thermal-insulated measure at compact type bituminous concrete to scene;
(4)Baffle is arranged in outside in advance in working face to be laid as needed, and spade is used on construction machinery wheel path Spread thin layer drying fine sand;
(5)By the way of erection construction conducting wire, is paved with two-shipper overall with or be divided to the mode that two width pave to work to be laid Make the compact type bituminous concrete that paves on face, the technique to pave is:It is continuously even using the crawler asphalt paver with equalizer bar Speed paves, and paver gait of march is maintained at 1 ~ 3m/min, coefficient of loose laying 1.1 ~ 1.3;
(6)It is combined and is rolled by ladder traveling, 1/3 folded wheel mode with pneumatic-tired rollers using steel roller, specifically Technique is:First, crawler asphalt paver static pressure is closely followed 3 ~ 4 times using dual-steel wheel road roller;Then, using double-steel wheeled vibratory Road roller rolls bridge area whole process 3 ~ 4 times by the way of static pressure, and 3 are rolled by the way of pressure of shaking back and forth to other regions ~ 4 times;Then, it is rolled 3 ~ 4 times using pneumatic-tired rollers;Finally, before surface temperature is down to 82 DEG C with dual-steel wheel road roller into The smooth receipts light processing of row final pressure, bituminous concrete waterproof layer are set as single open roof, the structure type of the gradient 4%;
(7)Spray 0.3 ~ 1.5kg/m2Adhesive layer, the construction of drainage blanket is begun preparing for after the not viscous wheel of adhesion coating pitch;
(8)Using the asphalt macadam needed for mixing building mix, concrete technology is:It is put in proportion into first into mixing building each Grain size gathers materials, and after specialist additive dry mixing at least 15s then is added, sequentially adds after filler and pitch mix again, total mix Time is no less than 60s, and drop temperature is maintained at 175 DEG C ~ 190 DEG C;
(9)Using the dump truck transport mix with waterproof thermal-insulated measure at asphalt macadam to scene;
(10)By the way of erection construction conducting wire, overall with paves asphalt macadam in the range that paves, and the technique to pave is: It is paved using the crawler asphalt paver continuously and smoothly with equalizer bar, paver gait of march is maintained at 1 ~ 3m/min, pine paving Coefficient 1.2 ~ 1.3;
(11)It is combined and is rolled by ladder traveling, 1/3 folded wheel mode with pneumatic-tired rollers using steel roller, specifically Technique is:First, crawler asphalt paver static pressure is closely followed 2 ~ 4 times using dual-steel wheel road roller;Then, using double-steel wheeled vibratory Road roller rolls bridge area whole process 2 ~ 4 times by the way of static pressure, and 2 are rolled by the way of pressure of shaking back and forth to other regions ~ 4 times;Then, it is rolled 2 ~ 4 times using pneumatic-tired rollers;Finally, before surface temperature is down to 82 DEG C with dual-steel wheel road roller into The smooth receipts light processing of row final pressure;The gradient of asphalt macadam drainage blanket curb part setting 4%;
(12)After asphalt macadam natural cooling, you can carry out subsequent handling construction;
(13)The processing of heated bitumen method is filled using joint-cutting with seam at contact net basic, cable trough, sump.
Advantageous effect:A kind of novel high speed railway sub-grade surface structure and its laying method provided by the invention, and it is existing Technology is compared, and has following advantage:
1, it is laid with the freeze proof layer of compact type bituminous concrete waterproof in bottom layer of subgrade top surface tunneling boring, then be laid on it certain The asphalt macadam drainage blanket of width, by the composite structure of asphalt macadam and closely knit bituminous concrete realize surface water it is quick under It blends and drains, avoid ponding and generate roadbed softening transform caused by flowing pressure, purt slurry under bullet train dynamic loading Etc. diseases, provide comprehensive three-dimensional waterproofing protection for roadbed;
2, it realizes vertical drainage using bituminous macadam, road bed ponding can be eliminated, because of the presence of a large amount of connectivity gaps, Recycling has the bituminous concrete waterproof layer of apparent two-way transverse slope to realize that rainwater to the confluence in both sides gutter, revolutionizes The variation of traditional high ferro roadbed track structure range internal drainage mode is arranged water-protected enclosure layer, is also not necessarily to online between being not necessarily to online Between sump is set, this increase construction speed, save engineering-built cost.
3, asphalt macadam and closely knit asphalt concrete layer have good self-healing property, the fine crack of generation, in mixture material Under the influence of material effect itself, temperature, time etc., also can slowly it heal;In special circumstances, larger crackle by vulcanize or the cementation of fissures at Reason can carry out Efficient software patching, replace graded broken stone surface layer of subgrade bed and cement concrete water proof layer with this, in contrast maintenance side Just, maintenance cost is low.
4, implemented using ripe asphalt concrete construction technology, it is advantageously ensured that the uniformity and stabilization of quality in site Property, and there is good construction efficiency, while the thickness of traditional 5 ~ 15cm of ballastless track structure can be reduced.
5, pass through the deformation cooperative ability and load diffusivity of asphalt macadam and closely knit bituminous concrete so that train lotus Dynamic stress disperses to be more uniformly distributed in fragment-free track slab and surface layer of subgrade bed caused by carrying, and improves the stress state of foundation bed structure, rises To damping, noise reduction, the effect for adapting to subgrade deformation, extend the fatigue life of fragment-free track slab and surface layer of subgrade bed.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
It is as shown in Figure 1 the structural schematic diagram of the present invention, a kind of novel railway sub-grade surface structure is suitable for high-speed iron Road or Special Railway Line for Passenger Transportation surface layer of subgrade bed, are laid between ballastless track structure supporting course and bottom layer of subgrade, surface layer of subgrade bed structure It is respectively asphalt macadam drainage blanket, adhesive layer, closely knit bituminous concrete waterproof layer from top to bottom.For convenience of draining and improve drip Green rubble and bituminous concrete surface erosion resistibility, the gradient of bituminous macadam curb part setting 4%, asphalt concrete layer It is set as single open roof, the structure type of the gradient 4%.
Rely on the result of numerical simulation to Asphalt Stabilized Macadam layer of the present invention and extraordinary enhancing asphalt concrete layer knot below Structure thickness selects and structure entirety stressing conditions are further described.
A kind of novel railway sub-grade surface structure, closely knit bituminous concrete waterproofing layer thickness choose 5,10cm, and pitch is broken Stone draining layer thickness chooses 10 respectively, 15,20,30cm, the mechanical analysis index used is vertical deformation, vertical acceleration and erects It is compared to stress, and with the mechanical characteristic of traditional ballastless track structure, selectes and be used as power on the inside of left rail immediately below rail It learns achievement data and extracts point, each layer result of calculation extraction position is located at each layer surface on same vertical path, as shown below.
Table 1 is the statistics of two kinds of structure lower railway layers vertical displacement maximum values, it can be seen that compared to tradition without the tiny fragments of stone, coal, etc. Track structure, the used structure of the present invention so that the vertical displacement of interlayer is reduced, and with asphalt macadam drainage blanket with The thickness of closely knit bituminous concrete waterproof layer increases, and the range of decrease of vertical displacement also increases.
Table 2 is the statistics of two kinds of vertical acceleration maximum values of structure lower railway layers, it can be seen that compared to traditional nothing Tiny fragments of stone, coal, etc. track structure, asphalt macadam drains 20 ~ 30cm of layer thickness in the structure that the present invention uses, and the vertical acceleration of each layer structure is general It all over being reduced, is drained under layer thickness with asphalt macadam, closely knit bituminous concrete waterproofing layer thickness increases, the vertical acceleration range of decrease Increase;And asphalt macadam draining layer thickness be less than 15cm when, the vertical acceleration of each layer structure is both greater than traditional structure substantially, because This asphalt macadam drainage blanket design thickness suggestion is more than 15cm.
Table 3 is the statistics of two kinds of structure lower railway layers vertical stress maximum values, it can be seen that the present invention is used The vertical stress of structural rail superstructure be slightly less than traditional ballastless track structure, and asphalt macadam drainage blanket and closely knit drip The influence that the thickness of green concrete water-proof layer decays to superstructure vertical stress is smaller;But the vertical stress of each layer of roadbed is universal Increase less than traditional ballastless track structure, and with the increase range of decrease of asphalt macadam drainage blanket and closely knit bituminous concrete waterproofing layer thickness Greatly, only in asphalt treated permeable layer 10 ~ 15cm of thickness, the vertical stress for draining layer surface is slightly larger than traditional structure.
Mechanical analysis is considered as a result, the present invention is considered as asphalt macadam draining 15 ~ 30cm of layer thickness, closely knit pitch 5 ~ 10cm of concrete water-proof layer thickness.
The above is only a preferred embodiment of the present invention, it should be pointed out that:For the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (7)

1. a kind of novel railway sub-grade surface structure, it is characterised in that:Include from top to bottom asphalt macadam drainage blanket, bonding Layer, closely knit bituminous concrete waterproof layer, utilize the water proofing property of the drainage performance and closely knit bituminous concrete of big gap asphalt macadam Track structure can be quickly discharged in surface layer of subgrade bed precipitation.
2. a kind of novel railway sub-grade surface structure according to claim 1, it is characterised in that:The asphalt macadam Thickness 15-30cm is drained, each ultra-wide 30cm is laid with along rail support layer both sides;Compact type bituminous concrete waterproof thickness 5- 10cm is laid with, transverse slope 4% along bedding tunneling boring, and adhesive layer dosage is 0.3 ~ 1.5kg/m2
3. a kind of novel railway sub-grade surface structure according to claim 1, it is characterised in that:The asphalt macadam and Closely knit bituminous concrete includes SBS modified pitch, specialist additive, coarse aggregate, fine aggregate and the filler for meeting grading requirement, institute Adhesive layer is stated using cationic emulsified bitumen or modified emulsifying asphalt or heat molten type pitch.
4. a kind of novel railway sub-grade surface structure according to claim 3, it is characterised in that:The asphalt macadam row Water layer, closely knit bituminous concrete waterproof layer are mixed heat by heat and are spread and through roller-compaction.
5. a kind of novel railway sub-grade surface structure according to claim 1, it is characterised in that:The asphalt macadam Voidage is 7%-15%, and the voidage of the closely knit bituminous concrete is 1-3%, and performance requirement is:
Marshall stability is not less than 10kN, and low-temperature bending strain is not less than 2500 μ ε, and linear contractive quotiety is not more than 30 μm/(m DEG C), dynamic modulus is not less than 10000MPa at 15 DEG C, and dynamic modulus is not less than 2000MPa at 40 DEG C, 0.1MPa at 40 DEG C, 10Hz, 1,000,000 dynamic compression creeps accumulated deformation be no more than 1mm, 10Hz, 200 μm of fatigue lives are more than 100 when room temperature Ten thousand times, freeze-thaw split intensity ratio is not less than 85%;Drainage blanket is not less than 0.2MPa with waterproof bond strength between layers, and shear strength is not Less than 0.6MPa.
6. a kind of novel railway sub-grade surface structure according to claim 3, it is characterised in that:The specialist additive It is faint yellow or black particle for appearance, direct plunges into mixing building and carry out during asphalt macadam and Asphalt concrete mixing Mix, volume are the 4% ~ 10% of asphalt content.
7. a kind of novel railway sub-grade surface structure according to claim 1, it is characterised in that:Asphalt macadam drainage blanket The gradient of curb part setting 4%, bituminous concrete waterproof layer are set as single open roof, the structure type of the gradient 4%.
CN201721791864.5U 2017-12-20 2017-12-20 A kind of novel railway sub-grade surface structure Active CN207749370U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111268943A (en) * 2020-02-10 2020-06-12 北京铁科特种工程技术有限公司 Asphalt graded broken stone for high-speed railway roadbed and preparation method thereof
CN113279290A (en) * 2021-07-22 2021-08-20 中国土木工程集团有限公司 Waterproof roadbed structure for railways in coastal high-water-level areas and construction method of waterproof roadbed structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111268943A (en) * 2020-02-10 2020-06-12 北京铁科特种工程技术有限公司 Asphalt graded broken stone for high-speed railway roadbed and preparation method thereof
CN113279290A (en) * 2021-07-22 2021-08-20 中国土木工程集团有限公司 Waterproof roadbed structure for railways in coastal high-water-level areas and construction method of waterproof roadbed structure

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