CN108333324A - A kind of Treatment Methods for alleviating roadbed frost damage deformation using poisson effect - Google Patents

A kind of Treatment Methods for alleviating roadbed frost damage deformation using poisson effect Download PDF

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Publication number
CN108333324A
CN108333324A CN201711407543.5A CN201711407543A CN108333324A CN 108333324 A CN108333324 A CN 108333324A CN 201711407543 A CN201711407543 A CN 201711407543A CN 108333324 A CN108333324 A CN 108333324A
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sample
hole
soil sample
roadbed
tubular
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CN201711407543.5A
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CN108333324B (en
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李军
高永强
徐剑宇
高贝
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神华集团有限责任公司
中国神华能源股份有限公司神朔铁路分公司
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24Earth materials
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • E01C3/04Foundations produced by soil stabilisation
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
    • E02D31/14Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against frost heaves in soil

Abstract

The present invention relates to road surface design of freezing resistance fields, disclose a kind of Treatment Methods of alleviation roadbed frost damage deformation.This approach includes the following steps:(1) roadbed soil sample is acquired in section to be punished;(2) the best hole ratio of the roadbed soil sample is determined according to following procedure:Test the optimum moisture content and maximum dry density of the roadbed soil sample, the compactness of the roadbed soil sample is determined according to the optimum moisture content and maximum dry density that measure, then the roadbed soil sample is made by a series of tubular samples for opening up hole according to the compactness, test the frozen-heave factor of these tubular samples, it chooses tubular sample of the frozen-heave factor less than 3% and calculates its hole ratio, be set to the best hole ratio of the roadbed soil sample;(3) the best hole ratio determined according to step (2) opens up hole vertically downward in the subgrade bed upper surface in the section to be punished.The poisson effect that this method can effectively utilize hole alleviates roadbed frost damage deformation.

Description

A kind of Treatment Methods for alleviating roadbed frost damage deformation using poisson effect
Technical field
It the present invention relates to the use of poisson effect and carry out Rail Highway roadbed design of freezing resistance field, and in particular to a kind of alleviation road The Treatment Methods of base frost-heaving deformation.
Background technology
Frozen soil is a kind of multi-phase complex system closed by cement ice and property is special, maximum special compared with other types soil Point is the unstability of the properties such as water, heat, power.China Frozen Ground Area is widely distributed, and there are about 98.9% areas by different type Frozen soil covered, wherein the area for the seasonal frozen soil region being affected to engineering construction accounts for the 53.5% of national area.
The construction of Qinghai-Tibet Highway and Qinghai-Tibet Railway accelerate China Frozen Ground Area transport development paces, recently as Harbin-to-Dalian, the construction for breathing out neat high ferro, China start to build trunk railway in seasonal frost region on a large scale.But either frost zone is also Ever-frozen ground, surface layer all there is one layer of winter freeze that the summer melts freeze a melt layer, which can cause roadbed in frozen-thaw process The variation of soil sample property is easy to happen the phenomenon of rising soil in road engineering spring, and tiny fragments of stone, coal, etc. railway ballast has been caused to fall into slot, significantly Sink deformation or side slope slump phenomenon, bring the diseases such as deformation, frost heave, sedimentation and crack to roadbed, seriously affect traffic safety And conevying efficiency.
According to the railway bed of Harbin Railway Bureau, Shenyang Railway Bureau, Hohhot Railway Administration and Qinhuangdao Shenyang Special Passenger Line disease Evil data, the frost heave in winter and the frost boiling in spring are the Major Diseases of Frozen Area railway bed.With the development of economy, by In the appearance of a large amount of high speeds, heavy-duty vehicle, the degree of this disease is more exacerbated.And China is just in northeast, northwest and China at present Carry out large-scale high speed railway construction in the frozen ground regions such as north.By the end of in March, 2015, the Northeast is completed and throws The high-speed railway for entering operation has the lines such as Harbin-to-Dalian, Chang Ji and Pan Ying, amounts to 1119 kilometers;Build include breathe out neat, Shen Dan, breathe out it is male, Beijing-Shenyang, Ji Tuhui, the circuits such as good are breathed out, totally 2198 kilometers.The Northwest is completed and what is put into effect has Lanzhou and Xinjiang, Zheng Xi, great Xi Equal circuits, amount to 2977 kilometers;There are the circuits such as western treasured, Borland in the circuit built, amounts to 625 kilometers.In addition, estimated according to China The Eurasian rapid transit corridor in Beijing to Moscow will be built, overall length is more than 7000 kilometers.
These high-speed railways have passed through the widely distributed extremely frigid zones of frozen soil, will be faced with during high ferro construction and operation A series of freeze proof problems such as cold-proof.Bullet train is more sensitive to the deformation response of roadbed under high-speed cruising state, freezes Swollen inhomogeneities often makes the level of track structure, height that uneven variation also occur, changes the whole smooth degree of circuit, and The larger frost-heaving deformation of roadbed also results in the working conditions such as rail clip, the tie rod in the above track structure of road bed almost Failure, causes circuit to be uneven, and to influence the ride comfort and riding comfort of railway, more seriously influences train Driving safety considerably increases the line upkeep workload of railway department.It can be said that seasonal frozen ground subgrade anti-freeze expansion is In great number of issues the most basis, the most core the problem of.Effectively solve the problems, such as that this can be the smooth of country of China and international strategies It promotes and solid theoretical foundation and strong technical support is provided.
In order to solve the problems, such as that roadbed frost damage, researcher have been carried out numerous studies and achieve certain achievement, than Such as change roadbed soil structure, adds isolated thermal-insulation water bed course etc..
A kind of structural system reducing tunnel in cold area lining cutting frost-heave force is disclosed in CN103541740A, by inside to outside Include that tunnel just serves as a contrast concrete, composite earthwork cloth waterproof layer, buffer layer and secondary lining successively;The buffer layer is steeped by polyethylene Foam plastic gasket and fiber enhanced foam coagulation local soil type at;The polyethylene foams liner is laid with and is fixed on waterproof layer table Face, and make the two close adhesion;Fiber enhanced foam concrete is poured on the outside of polyethylene foams liner.
《Seasonal frozen ground subgrade anti-freeze expansion technical research》(Chinese Highway journal, 2013,26 (6):It is disclosed in 9-14) A kind of seasonal frozen ground subgrade anti-freeze expansion technical research, by adding water proof native using macadam pavement bed course in frozen ground regions Work film is deformed with reducing Seasonal freeaing depth so as to improve Road Frost & Bulge.
However, being at present solely to reduce the longitudinal of roadbed to freeze mostly seasonal frost region roadbed frost damage way to solve the problem and technology Bulk not can be well solved the differential frost heave problem of roadbed.Therefore, how to improve the horizontal and vertical shape of roadbed simultaneously Become, by roadbed frost damage power uniformly and effectively to discharge be one, subgrade engineering design of freezing resistance field urgent problem to be solved.
Invention content
The purpose of the invention is to overcome the longitudinal frost heaving amount of the existing technology that only can solely reduce roadbed, The methods of the differential frost heave of roadbed is not can be well solved, and be laid with bed course complicated for operation, the defects of construction cost is high, provides It is a kind of alleviate roadbed frost damage deformation Treatment Methods, this method by section to be punished subgrade bed upper surface vertically to Under open up the hole of specific hole ratio, the longitudinal frost-heaving deformation generated when effectively utilizing the poisson effect of hole by roadbed frost damage It is converted into the cross-direction shrinkage deformation of hole, while roadbed frost damage power can also be changed by the different degrees of volume contraction of hole Even and effectively discharge, this method has many advantages, such as operation easy to implement, high-precision, low cost, in subgrade engineering design of freezing resistance Field has broad application prospects.
To achieve the goals above, the present invention provides a kind of Treatment Methods of alleviation roadbed frost damage deformation, and this method includes Following steps:
(1) roadbed soil sample is acquired in section to be punished;
(2) the best hole ratio of the roadbed soil sample is determined according to following procedure:The optimal of roadbed soil sample is tested to contain Water rate and maximum dry density determine the compactness of the roadbed soil sample according to the optimum moisture content and maximum dry density that measure, so The roadbed soil sample is made by a series of tubular samples for opening up hole according to the compactness afterwards, tests these tubular samples Frozen-heave factor chooses tubular sample of the frozen-heave factor less than 1.2% and calculates its hole ratio, is set to the best of the roadbed soil sample Hole ratio;
(3) the best hole ratio determined according to step (2) is vertical in the subgrade bed upper surface in the section to be punished Open up hole downwards.
The present inventor has found after the method for a large amount of prior art is repeated, at present seasonal frost region roadbed frost damage problem Solution and technology be mostly solely to reduce longitudinal frost heaving amount of roadbed, not can be well solved the differential frost heave of roadbed Problem.The present inventor has been surprisingly found that poisson effect can be advantageously applied to roadbed frost damage during numerous studies The alleviation of deformation by opening up hole on roadbed, and determines rational hole ratio and hole depth, can effectively utilize hole The longitudinal frost-heaving deformation generated when the poisson effect in hole is by roadbed frost damage is converted into the cross-direction shrinkage deformation of hole, while can also incite somebody to action Roadbed frost damage power is uniformly effectively discharged by the different degrees of volume contraction variation of hole.
In addition, this method have many advantages, such as it is easy to implement operation, high-precision, low cost, can be seasonal frozen soil region road Base laying method alleviates punishment with frost heave and provides technological guidance.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.It should be understood that described herein specific Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of Treatment Methods of alleviation roadbed frost damage deformation, and this approach includes the following steps:
(1) roadbed soil sample is acquired in section to be punished;
(2) the best hole ratio of the roadbed soil sample is determined according to following procedure:The optimal of roadbed soil sample is tested to contain Water rate and maximum dry density determine the compactness of the roadbed soil sample according to the optimum moisture content and maximum dry density that measure, so The roadbed soil sample is made by a series of tubular samples for opening up hole according to the compactness afterwards, tests these tubular samples Frozen-heave factor chooses tubular sample of the frozen-heave factor less than 3% and calculates its hole ratio, is set to the best hole of the roadbed soil sample Hole rate;
(3) the best hole ratio determined according to step (2) is vertical in the subgrade bed upper surface in the section to be punished Open up hole downwards.
In the present invention, the hole ratio of described hole refers to, in the tubular sample for opening up hole, the hole that opens up The ratio between the cross-sectional area of the cross-sectional area in hole and the tubular sample.
According to the present invention, the reference standard number of choosing of the frozen-heave factor is GB 50324-2014's《Frozen soil engineering geology is surveyed Examine specification》It determines.
Under preferable case, in step (2), the frozen-heave factor is less than 1.05%;It is further preferred that the frozen-heave factor is 0.05-1.05%.The longitudinal frost heave generated when can ensure the poisson effect of opened up hole enough by roadbed frost damage in this way Deformation is converted into the cross-direction shrinkage deformation of hole, makes roadbed frost damage power by the different degrees of volume contraction variation of hole is uniform It effectively discharges, so as to improve the frost-heaving deformation situation of roadbed.
According to the present invention, the poisson effect refers to material when unidirectional tension or in compression, and material is extended along loading direction Or while shortening, there is a phenomenon where shortening or extended perpendicular to material loading direction.
In the present invention, the mark of dry density and the soil sample of the compactness of the soil sample after to refer to that soil sample is practical be compacted The ratio between quasi- dry density.
In the present invention, during determining the compactness of the roadbed soil sample, the intergranular gravitation of roadbed soil sample and The relative size of repulsion determines the structure of compacted subgrade soil sample.When the moisture content of the roadbed soil sample is less than described optimal aqueous Rate, when dry density is higher than the maximum dry density, gravitation is larger between the roadbed soil sample particle, in certain external compactive effort Under capable of acting on, roadbed soil sample particle can't be made to relatively move efficiently against gravitation, at this moment consolidation effect is poor;It is appropriate to increase After big moisture content, dry density reduces, and in conjunction with moisture film progressive additive, gravitation reduces, and roadbed soil sample particle is under the conditions of identical function It is be easily moved and compacted, so consolidation effect is preferable;When moisture content increases to above optimum moisture content, dry density is decreased below After maximum dry density, occurs Free water in hole, the expansion effect in conjunction with moisture film is no longer notable, thus the reduction of gravitation It is not very notable, while Free water is filled in the effect for preventing roadbed soil sample particle to move in hole but with the increasing of moisture content Add and gradually significantly, so consolidation effect declines instead at this time.Therefore, in the present invention, need according to the subgrade soils The optimum moisture content and maximum dry density of sample determine the compactness of the roadbed soil sample.
According to the present invention, in step (2), the optimum moisture content of the roadbed soil sample and the process packet of maximum dry density are tested It includes:It by the roadbed soil sample natural air drying of acquisition, is sieved after then pulverizing, collects the soil sample after screening, carry out standard compaction test, Obtain the dry density of the soil sample after screening with the variation relation curve of moisture content, the corresponding dry density of maximum point of the curve Value and water cut value are the maximum dry density and optimum moisture content of the roadbed soil sample.
According to the present invention, it is preferably more than 1mm for sieving the mesh size of sieve of roadbed soil sample, granularity is obtained and is less than The soil sample of 1mm.
In the present invention, granularity refers to the particle size of feed particles, the then granularity sphere when feed particles are sphere Diameter indicate, when feed particles be cube when then granularity indicated with the cubical length of side, when feed particles be it is irregular Then granularity is indicated with the mesh size for the sieve that can screen out the feed particles just when shape.
According to the present invention, the granularity of soil sample can influence the heave susceptibility of soil sample.When the granularity of the soil sample is no more than 1mm When, the heave susceptibility of the soil sample is higher, and the frost-heaving deformation alleviation method for studying the soil sample of above-mentioned grain size is a variety of for alleviating The soil sample frost-heaving deformation of the roadbed of soil property has extensive directive significance.
According to the present invention, in step (2), the preparation process of the tubular sample for opening up hole includes:
(a) according to the optimum moisture content and maximum dry density measured, the compactness of the roadbed soil sample is determined, and according to institute The weight for stating the dry ground weight and water of the roadbed soil sample that tubular sample is prepared needed for compactness calculating, roadbed soil sample and water are mixed Uniformly, it then makes firm by ramming and hits in fact to the compactness in layering filling tubular sample preparation device;
(b) hole is opened up in the roadbed soil sample for reaching the compactness;
(c) top of the tubular sample preparation device is sealed, and is from top to bottom inserted successively in the side of the tubular sample preparation device Enter temperature sensor, carrying out cooling to the roadbed soil sample freezes, and it is -15 to -1 to control tubular sample preparation device upper surface temperature DEG C, it is 1 to 5 DEG C to control the tubular sample preparation device underlaying surface temperature, and roadbed soil sample in the tubular sample preparation device is made to freeze from top to bottom Tie 24-72h.
According to the present invention, it is one or more that the hole of the tubular sample, which opens up number,.When the hole of the tubular sample Open up number be 1 when, described hole opens up the center that position is preferably the tubular sample;When the hole of the tubular sample It is wide open set number as it is multiple when, the cross-sectional area of each hole can be identical or different.Under preferable case, when the tubular sample Hole open up number be it is multiple when, the cross-sectional area of each hole is identical, and each hole is uniformly distributed in the tubular sample, example Such as, the center of each hole can be distributed in the center of the tubular sample on multiple circumferences of concentric circles, and each two The distance at adjacent hole center is equal, and the radius of each circumference can be the cross section intercept size of the tubular sample 12.5-37.5%.The longitudinal frost-heaving deformation generated when being conducive in this way by roadbed soil sample frost heave is more uniformly converted into each hole Cross-direction shrinkage deformation, and then roadbed soil sample frost-heave force is made more uniformly to discharge.
It is described in order to make contraction change uniformity of the roadbed soil sample frost heave strain by pore volume according to the present invention The cross sectional shape of hole is preferably circular or regular polygon.
According to the present invention, in step (2), the process that opens up of described hole may include:Real process is hit in roadbed soil sample In, it is put into punch die in the tubular sample, after roadbed soil sample reaches the compactness, will be taken out at punch die, one Secondary pore-forming.It can ensure that described hole uniformly opens up vertically downward from the tubular sample surfaces in this way, frost heave occurs for each section Stress is identical when deformation.
According to the present invention, described at punch die is preferably polyvinyl chloride (PVC) pipe, polyvinyl chloride be it is a kind of have it is good The material of heat resistance, toughness and ductility, when using polyvinyl chloride pipe as at punch die, when can ensure into punch die and taking out Integrality, make it is described be unlikely to be broken when taking out in the tubular sample from compacting at punch die, described in ensureing Hole opens up quality.
According to the present invention, the 80-180% for opening up the depth of freezing that depth is the tubular sample of described hole.
In the present invention, the depth of freezing of the tubular sample refers to being measured down from the upper surface of the tubular sample, It is frozen the thickness of sample.The conventional method for measuring the depth of freezing of tubular sample is will to fill distilled water, the plastic cement of both ends sealing Pipe is vertically placed in embedment tubular sample, it is assumed that premised on freezing the variation of level temperature linearity, in tubular sample freezing process In, linear interpolation solves starting solidification point point position and obtains freezing front variation, and temperature in use logging passes all temperature Sensor measured value is collected, and reads freezing meter depth of freezing value.
According to the present invention, when subgrade bed of the best hole ratio determined according to step (2) in the section to be punished When upper surface opens up hole vertically downward, the depth of described hole depends on level of ground water under practical roadbed and frozen soil winter The average depth of freezing, for example, whether running through the flat of level of ground water and frozen soil winter of the roadbed soil sample under roadbed in hole arrangement The equal depth of freezing, principle are that hole bottom answers height on level of ground water, and is not less than on capillary water apart from level of ground water and increases Degree, herein under the premise of, be not less than winter the standard depth of freezing.
According to the present invention, the standard depth of freezing of practical roadbed is:In ground even, exposed, except city spacious field The average value of 10 years actual measurement depth of freezing is no less than in ground.
The present invention will be described in detail by way of examples below.
In following embodiment and comparative example, the temperature information of probe-type temperature sensor acquisition is through data collector Datataker80 is passed to computer, by Deloger software realizations to the sample frequency of data collector, data memory format and The control of output format.Frost heave displacement data is acquired by high-precision digital-display displacement dial gauge and is passed to computer, and micrometer system is passed through Control that system software realization acquires data, including sample frequency, mostly micro- end acquisition and setting sampled data initial value etc..
In following embodiment and comparative example, the computational methods of the frozen-heave factor of tubular sample are:η=Δ h/Hf× 100%
In formula:η is frozen-heave factor (%);
Δ h is frost heaving amount (mm);
HfFor the depth of freezing (mm).
Embodiment 1-5 and comparative example 1-3
1) the undisturbed soil natural air drying that roadbed scene is fetched by certain seasonal frost region removes impurity in soil after air-drying, is ground with muller 1mm sieves are crossed after broken, collect the roadbed soil sample after screening;
2) according to《Earthwork test rule》Specification provides, the dry density for obtaining roadbed soil sample is measured with moisture content by testing Variation relation curve and its physical and mechanical parameter;
3) preparation of tubular sample:The roadbed soil sample of 2400g is weighed in iron pan, is placed in baking oven 6~8h to roadbed soil sample Drying, sealing are spare.Compactness λ, the moisture content ω and hole ratio H determined according to testing program calculates roadbed soil sample needed for experiment Quality adds water uniform mixing.After the roadbed soil sample mixed and stirred is weighed in layering filling tempering organic glass sample preparation device, by compacting It is hit in fact to the compactness being pre-designed it is required that making firm by ramming, wherein the tempering organic glass bucket sample preparation device internal diameter × height=100mm × 165mm, experiment soil sample diameter × height=100mm × 150mm;In five layers of organic glass tank sample preparation device of filling of the soil sample point, use Every layer of subgrade soils sample compacting to thickness is 3cm by ramming device, and every layer is hit after reality and needs 0.5~1cm of shaving deep, to ensure roadbed soil sample Completely;
4) pore-creating is filled:The pvc pipe of different tube diameters is inserted into compacted subgrade soil sample, roadbed soil sample is taken out and obtains different holes The hole of rate H sizes;
5) after filter paper is placed in tempering organic glass bucket sample preparation device top surface, it is capped upper plate, is sealed with vaseline.Tempering has Machine glass tank sample preparation device side is in roadbed soil sample altitude range, from the top of roadbed soil sample, set to 0 in place respectively mm (top), Probe-type temperature sensor is inserted at 30mm, 70mm, 110mm, 150mm (bottom), high-precision digital-display displacement dial gauge is placed in Top plate.Experiment carries out in low temperature chamber, and environment temperature is controlled by low temperature chamber;Test specimen tube lower plate (warm end) and upper plate are (cold End) temperature controlled by cryostat circulator;
6) cool down:Maintenance low temperature room temperature is 1 DEG C, and it is 1 DEG C to adjust lower plate and upper plate temperature, and cooling extremely tries for 12 hours It tests roadbed soil sample and is integrally cooled to 1 DEG C;
7) after sample is integrally cooled to 1 DEG C, upper plate temperature is adjusted to experimental condition setting by cryostat circulator Fixed -3 DEG C of subzero temperature (cold end solidification point) keeps 1 DEG C of bottom plate temperature (warm end temperature) constant, and roadbed soil sample is frozen from top to bottom Tie 48h.Test the depth of freezing.
8) sample dismounting and soil layer measurement of water-content coefficient:After sample freezes, organic glass bucket sample preparation device is removed, takes out and freezes Tie roadbed soil sample.According to《Earthwork test rule》Specification provides, freezes roadbed soil sample bottom end certainly, is cut for 1cm by every layer thickness Roadbed soil sample measures each layer moisture content ωi
Above-mentioned steps 3) in, punching the computational methods of the quality of sample is:
m00·λ·(1+ω)·(V-V’)
In formula:
m0--- sample mass, g;
γ0--- roadbed soil sample maximum dry density, g/cm3
The volume of V --- test specimen tube, cm3
The volume of V ' --- hole, cm3
λ --- the compactness needed for experiment, %;
ω --- controlling test moisture content, %.
The definition of hole ratio H is:The ratio of artificial pore-creating sectional area and the cross-sectional area of the tubular sample.
The computational methods of hole ratio H are:
H=[(π r2)/(π·R2)] × 100%
In formula:
H --- hole ratio, %;
The radius of r --- hole, mm;
The cross sectional radius of R --- soil sample, mm.
The hole ratio of embodiment 1-5 and comparative example 1-3, hole depth, the tubular sample depth of freezing, the compacting of roadbed soil sample Degree, moisture content, dry density and granularity are as shown in table 1.
The frozen-heave factor of roadbed soil sample in each embodiment and comparative example is tested, test result is as shown in table 1.
Table 1
It can be seen that by the result of table 1 and passed through in certain seasonal frost region roadbed preparation of soil sample using method provided by the invention Tubular sample in open up hole and according to the tubular sample frozen-heave factor measured (in the present invention to be less than 3%, preferably 0.5-1.05%) determine preferably hole ratio (in the present invention, the compactness of tubular sample be 0.89 when, hole ratio 2- 4%;The compactness of tubular sample be 0.93 when, hole ratio 1-4%) and hole depth (be in the present invention the depth of freezing 80-180%), the effect for alleviating roadbed soil sample frost heave can be effectively achieved.Especially when described hole rate and hole depth make When the tubular sample frozen-heave factor is in preferred scope, the alleviation frost heave effect that roadbed soil sample obtains is particularly evident.This method has Have the advantages that it is easy to implement operation, high-precision, low cost, Rail Highway roadbed design of freezing resistance field have wide application before Scape.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In the skill of the present invention In art conception range, technical scheme of the present invention can be carried out a variety of simple variants, including each technical characteristic with it is any its Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, belongs to Protection scope of the present invention.

Claims (10)

1. a kind of Treatment Methods for alleviating roadbed frost damage deformation, this approach includes the following steps:
(1) roadbed soil sample is acquired in section to be punished;
(2) the best hole ratio of the roadbed soil sample is determined according to following procedure:Test the optimum moisture content of the roadbed soil sample And maximum dry density, the compactness of the roadbed soil sample is determined according to the optimum moisture content and maximum dry density that measure, then root A series of tubular samples for opening up hole are made in the roadbed soil sample according to the compactness, test the frost heave of these tubular samples Rate chooses tubular sample of the frozen-heave factor less than 3% and calculates its hole ratio, is set to the best hole of the roadbed soil sample Rate;
(3) according to step (2) determine best hole ratio the section to be punished subgrade bed upper surface vertically downward Open up hole.
2. Treatment Methods according to claim 1, wherein in step (2), the frozen-heave factor is less than 1.05%;
Preferably, the frozen-heave factor is 0.5-1.05%.
3. Treatment Methods according to claim 1, wherein in step (2), test the optimum moisture content of the roadbed soil sample Process with maximum dry density includes:It by the roadbed soil sample natural air drying of acquisition, is sieved after then pulverizing, collects the soil after screening Sample, carry out standard compaction test, obtain screening after soil sample dry density with moisture content variation relation curve, the curve The corresponding dry density value of maximum point and water cut value are the maximum dry density and optimum moisture content of the roadbed soil sample.
4. Treatment Methods according to claim 1, wherein in step (2), the system of the tubular sample for opening up hole Include for process:
(a) according to the optimum moisture content and maximum dry density measured, the compactness of the roadbed soil sample is determined, and according to the pressure The weight that the dry ground weight and water of the roadbed soil sample of tubular sample are prepared needed for solidity calculating mixes roadbed soil sample and water equal It is even, then in layering filling tubular sample preparation device, makes firm by ramming and hit in fact to the compactness;
(b) hole is opened up in the roadbed soil sample for reaching the compactness;
(c) top of the tubular sample preparation device is sealed, and temperature is from top to bottom sequentially inserted into the side of the tubular sample preparation device Sensor is spent, carrying out cooling to the roadbed soil sample freezes, and it is -15 to -1 DEG C to control tubular sample preparation device upper surface temperature, It is 1 to 5 DEG C to control the tubular sample preparation device underlaying surface temperature, and roadbed soil sample in the tubular sample preparation device is made to freeze from top to bottom 24-72h。
5. Treatment Methods according to claim 1, wherein in step (2), the hole of the tubular sample opens up number and is One or more.
6. Treatment Methods according to claim 1 or 5, wherein it is 1 that the hole of the tubular sample, which opens up number,;It is excellent Selection of land, described hole open up the center that position is the tubular sample.
7. Treatment Methods according to claim 1 or 5, wherein it is multiple that the hole of the tubular sample, which opens up number,;
Preferably, each hole is uniformly distributed in the tubular sample.
8. Treatment Methods according to claim 1, wherein in step (2), the cross sectional shape of described hole is round or just Polygon;Preferably, the cross sectional shape of described hole is circle.
9. Treatment Methods according to claim 1, wherein in step (2), the process that opens up of described hole includes:On road Base soil sample is hit during reality, and punch die is put into the tubular sample, will after roadbed soil sample reaches the compactness It is taken out at punch die, one-step pore-creating.
10. Treatment Methods according to claim 1, wherein in step (2), the depth that opens up of described hole is the cylinder The 80-180% of the depth of freezing of shape sample.
CN201711407543.5A 2017-12-22 2017-12-22 Treatment method for relieving frost heaving deformation of roadbed by using Poisson effect Active CN108333324B (en)

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