CN104176962A - Method of gravel grading design for high-speed rail subgrade - Google Patents
Method of gravel grading design for high-speed rail subgrade Download PDFInfo
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Abstract
The invention provides a method of a gravel grading design for a high-speed rail subgrade. The method comprises the following steps: respectively screening gravels in different particle diameters by virtue of sieve pores; determining the mixing amount of second-grade aggregates according to the change rule of a CBR value by taking the gravels with the particle diameter of 16 as first-grade aggregates and the gravels with the particle diameter of 19 as the second-grade aggregates; adding third-grade aggregates into the optimally-proportioned mixed aggregates of the first-grade aggregates and the second-grade aggregates by taking the gravels with the particle diameter of 26.5 as the third-grade aggregates, and determining the mixing amount of the third-grade aggregates by measuring the change rule of the CBR value; respectively determining the optimal mixing amount of fourth-grade gravel aggregates with the particle diameter of 13.2, fifth-grade gravel aggregates with the particle diameter of 9.5 and sixth-grade gravel aggregates with the particle diameter of 4.75 by adopting the same method; finally determining the mixing amount of the gravels with the different particle diameters in the coarse aggregates; determining the grading of fine aggregates according to a theoretical calculation method based on a K value; mixing the theoretically-calculated fine aggregates with the coarse aggregates, and carrying out a CBR test on the mixed aggregates so as to determine the grading of the coarse aggregates and the fine aggregates. The method can be used for efficiently, visually and accurately reflecting the basic performance of the graded gravels taken as the subgrade so as to provide a necessary guarantee for construction quality and engineering safety.
Description
Technical field
The present invention relates to high-speed railway subgrade macadam gradating design and construction field, a kind of method of high ferro roadbed macadam gradating design is provided.
Background technology
Along with continuous quickening and economical and the scientific and technological leap of China's Reformation and development paces, the railway technology of China, especially high ferro technology sustained and rapid development, has embodied a concentrated reflection of China railways traffic and has realized the process of great-leap-forward development, makes Chinese Railway Infrastructure aggregate level realize historical leap.High-speed railway subgrade is the basis of bearing track structure and train load, it is the important component part of railway engineering, except possessing basic function, the requirement of shock load also should additionally meet train high-speed cruising time: there is enough intensity, rigidity, stability and weather resistance, the various situations that may occur when can bearing normal construction and using.
The performance of material and its structure close relation, structures shape the performance of compound.Especially for graded broken stone, its Main Mechanical is from the embedded squeezing effect between gathering materials, and therefore good grain composition plays vital effect.Graded broken stone is a kind of built-in and extruding compact structure being made up of different-grain diameter building stones, and level pairing elastic mould value has considerable influence.In addition, graded broken stone makes loose media form skeleton by vibroroller cmpacting, thereby possesses some strength.Grating is to affect the most important factor of graded broken stone strength and stiffness.In general, closely knit grating easily obtains high-density, thereby makes graded broken stone obtain high CBR value, the modulus of resilience and permanent deformation resistance.
So far, aggregate grading composition has embedded squeezing principle and grating principle.Conventional research of grade-suit theory mainly contains maximum density curve theory and particle interference theory, and last theory has mainly been described the size distribution of continuous grading, can be used for calculating continuous grading.A rear theory not only can for calculate continuous grading, and can for calculate gap grading.
Maximum density curve theory is the imaginary ideal curve of one proposing by test.Fu Le (w.B.Fuller) and his colleague research are thought: solid particulate is by globule size assembled arrangement regularly, and thickness is arranged in pairs or groups, and can reach the compound of density maximum, space minimum.The ideal curve of initial research is: being oval curve compared with the grain composition of fine aggregate, is the straight line tangent with ellipse compared with the grain composition of coarse aggregate, and the graduation curve being made up of this two portions curve can reach maximum density.This curve calculation more complicated, passed through many Improvements afterwards, proposed the para-curve maximum density curve theory of simplifying.This theory is thought: the grading curve of Mineral Aggregate more approaches para-curve, and closely knit larger, common method of calculation have n method, k method etc.Particle interference theory is thought: for reaching maximum density, space between previous stage particle should be filled by inferior primary granule, all the other spaces are filled by small-particle again again, but the greatly therebetween distance of gap of the grain diameter of calking, otherwise certainly will interfere phenomenon between size particles particle.
Its design-calculated clou of above-named research of grade-suit theory is all identical, makes its degree of compactness reach maximum by the combination that different-grain diameter is gathered materials, but in actually operating strictly not like this.In general we always consider to reduce the voidage of compound in the time carrying out the design of grating how as far as possible, improve the degree of compactness of compound, and do not consider the formational situation of the skeleton of compound own.It is not likely fine having its skeleton of grating that experiment has proved that degree of compactness is larger, such as suspension compact-type grating, this grating does not meet construction requirement.
Summary of the invention
Goal of the invention: in order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide the method for a kind of more highly effective high ferro roadbed macadam gradating design more accurately.
Technical scheme: high ferro roadbed provided by the invention comprises the following steps by the method for macadam gradating design:
The first step, the standard square hole sieve that is respectively 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm with sieve aperture sieves out single Stone, sieves respectively to obtain the rubble of 0.075,0.15,0.3,0.6,1.18,2.36,4.75,9.5,13.2,16,19,26.5,31.5 particle diameters;
Second step, using the rubble of 16 particle diameters as first step pellet, the rubble of 19 particle diameters is as second stage pellet, and gradient is mixed the two according to a certain percentage, by measuring CBR value Changing Pattern, determines the volume of second stage pellet; Using the rubble of 26.5 particle diameters as third stage pellet, mix in the compound of first and second grade of optimum proportion, gradient is mixed the two according to a certain percentage, by measuring CBR value Changing Pattern, determines the volume of third stage pellet; Adopting uses the same method determines respectively the optimum mix amount of the rubble of 13.2,9.5,4.75 particle diameters; Final definite 4.75mm is the rubble volume of each particle diameter in coarse aggregate above;
The 3rd step, the method for the K value Theoretical Calculation of use maximum density curve theory, determines that the following rubble of 4.75mm is the grating of fine aggregate;
The 4th step, mixes the fine aggregate of step 3 Theoretical Calculation with coarse aggregate, compound carries out CBR test, determines the grating of coarse aggregate and fine aggregate.
Wherein, in second step, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 15.0～20.0% of 4.75 particle diameters; The rubble 16.0～18.0% of 9.5 particle diameters; The rubble 12～14.5% of 13.2 particle diameters; The rubble 15～17% of 16 particle diameters; The rubble 21～22% of 19 particle diameters; The rubble 14.5～15% of 26.5 particle diameters; Preferably, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 20.0% of 4.75 particle diameters; The rubble 16.0% of 9.5 particle diameters; The rubble 12.4% of 13.2 particle diameters; The rubble 15.4% of 16 particle diameters; The rubble 21.4% of 19 particle diameters; The rubble 14.8% of 26.5 particle diameters.
Wherein, in the 3rd step, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is 3.5～5.0%, 0.15 particle diameter is that 10.0～11.5%, 0.3 particle diameter is that 23.0～25.0%, 0.6 particle diameter is 14.0～15.0%, 1.18 particle diameters are that 18.5～21%, 2.36 particle diameters are 26～27.5%; Preferably, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 4.4%, 0.15 particle diameter is that 10.8%, 0.3 particle diameter is that 24.0%, 0.6 particle diameter is that 14.5%, 1.18 particle diameter is that 19.7%, 2.36 particle diameter is 26.6%.
Wherein, in the 4th step, the grating of coarse aggregate and fine aggregate is coarse aggregate 65%～75%, and fine aggregate is 25%～35%; Preferably, be 74.1%:25.9%.
Beneficial effect: high ferro roadbed provided by the invention calculates to design by the basic mechanical performance binding isotherm of measuring the framework compact grating that skeleton structure and degree of compactness all meet service requirements by the method for macadam gradating design, can reflect efficiently, intuitively, exactly the fundamental property as the graded broken stone of roadbed, for construction quality and engineering safety provide necessary guarantee.
The method is a kind of new gradation design method, compared with traditional method, has taken into full account mechanical property and the practical situations of gravel aggregate, thereby has designed the better macadam gradating of more closely knit skeleton structure.
The method mechanism is as follows: CBR value is representing the resistivity of loose material to external force injection, namely the ability of vertical compressive strain.And looking like its intensity of this loose material of graded broken stone mainly from intergranular friction resistance, the numerical value of internal friction angle directly affects the size of friction resistance.The actual loading situation of roadbed material and CBR experiment have the epidemic situation comparison of side limit to approach, and therefore the size of CBR value can approximate reverse mirror the crowded degree of closing of inlaying of pellets at different levels.It is better that the compound of stable and less distortion that can long period holding structure under the injection effect of external force can be regarded as its skeleton.This material has higher internal friction resistance, and CBR trial value is higher.And in general continuous grading has better serviceability with respect to gap grading, therefore adopt the pellet of continuous distribution.On the other hand, the contribution function effect of the formation of the pellet that is less than 4.75mm due to particle diameter to skeleton is too little negligible, just plays a role as the weighting material in skeleton, is determined by K value method therefore be less than the pellet grating of 4.75mm.And then determine by CBR experimental technique the ratio that thickness is gathered materials, thereby when ensureing that coarse aggregate forms reasonable skeleton, fine aggregate also can be filled the space of coarse aggregate skeleton.
Brief description of the drawings
Fig. 1 is stage filling CBR value Changing Pattern, as seen from the figure, and the directive function of CBR value to gradation design.The skeleton that coarse aggregate forms is subject to the content influence maximum of 4.75～9.5 pellets in this, can see after 4.75 (level V) pellet that remarkable reduction appears in CBR numerical value from CBR value with filling curve that progression changes.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided detailed implementation process, but protection scope of the present invention is not limited to following embodiment.
Get representative sample 50Kg, approximately get 25Kg after sieving, quartering is divided into 4 parts, every part of about 6Kg, for compaction test and test block processed.
Utilize technical solution of the present invention, determine macadam gradating, method is as follows:
The first step, the standard square hole sieve that is respectively 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm with sieve aperture sieves out single Stone, sieves respectively to obtain the rubble of 0.075,0.15,0.3,0.6,1.18,2.36,4.75,9.5,13.2,16,19,26.5,31.5 particle diameters;
Second step, using the rubble of 16 particle diameters as first step pellet, the rubble of 19 particle diameters is as second stage pellet, and gradient is mixed the two according to a certain percentage, by measuring CBR value Changing Pattern, determines the volume of second stage pellet; Using the rubble of 26.5 particle diameters as third stage pellet, mix in the compound of first and second grade of optimum proportion, gradient is mixed the two according to a certain percentage, by measuring CBR value Changing Pattern, determines the volume of third stage pellet; Adopting uses the same method determines respectively the optimum mix amount of the rubble of 13.2,9.5,4.75 particle diameters; Final definite 4.75mm is the rubble volume of each particle diameter in coarse aggregate above;
The 3rd step, the method for the K value Theoretical Calculation of use maximum density curve theory, determines that the following rubble of 4.75mm is the grating of fine aggregate;
The 4th step, mixes the fine aggregate of step 3 Theoretical Calculation with coarse aggregate, compound carries out CBR test, determines the grating of coarse aggregate and fine aggregate.
Determine following macadam gradating by above method:
Embodiment 1
The grating of coarse aggregate and fine aggregate is: coarse aggregate 74.1%, fine aggregate 25.9%.
Wherein, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 20.0% of 4.75 particle diameters; The rubble 16.0% of 9.5 particle diameters; The rubble 12.4% of 13.2 particle diameters; The rubble 15.4% of 16 particle diameters; The rubble 21.4% of 19 particle diameters; The rubble 14.8% of 26.5 particle diameters.
Wherein, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 4.4%, 0.15 particle diameter is that 10.8%, 0.3 particle diameter is that 24.0%, 0.6 particle diameter is that 14.5%, 1.18 particle diameter is that 19.7%, 2.36 particle diameter is 26.6%.
This graded broken stone CBR value is 75, and maximum dry density is 2.16g/cm
3.
Embodiment 2
The grating of coarse aggregate and fine aggregate is: coarse aggregate 74.1%, fine aggregate 25.9%.
Wherein, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 15.0% of 4.75 particle diameters; The rubble 18.0% of 9.5 particle diameters; The rubble 14.4% of 13.2 particle diameters; The rubble 16.4% of 16 particle diameters; The rubble 21.4% of 19 particle diameters; The rubble 14.8% of 26.5 particle diameters.
Wherein, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 4.4%, 0.15 particle diameter is that 10.8%, 0.3 particle diameter is that 24.0%, 0.6 particle diameter is that 14.5%, 1.18 particle diameter is that 19.7%, 2.36 particle diameter is 26.6%.
This graded broken stone CBR value is 73, and maximum dry density is 2.13g/cm
3.
Embodiment 3
The grating of coarse aggregate and fine aggregate is: coarse aggregate 71%, fine aggregate 29%.
Wherein, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 15.0% of 4.75 particle diameters; The rubble 18.0% of 9.5 particle diameters; The rubble 14.4% of 13.2 particle diameters; The rubble 16.4% of 16 particle diameters; The rubble 21.4% of 19 particle diameters; The rubble 14.8% of 26.5 particle diameters.
Wherein, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 4.4%, 0.15 particle diameter is that 10.8%, 0.3 particle diameter is that 24.0%, 0.6 particle diameter is that 14.5%, 1.18 particle diameter is that 19.7%, 2.36 particle diameter is 26.6%.
This graded broken stone CBR value is 76, and maximum dry density is 2.08g/cm
3.
Embodiment 4
The grating of coarse aggregate and fine aggregate is: coarse aggregate 65%, fine aggregate 35%.
Wherein, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 15.0% of 4.75 particle diameters; The rubble 18.0% of 9.5 particle diameters; The rubble 14.5% of 13.2 particle diameters; The rubble 17% of 16 particle diameters; The rubble 21% of 19 particle diameters; The rubble 14.5% of 26.5 particle diameters.
Wherein, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 3.5%, 0.15 particle diameter is that 10.0%, 0.3 particle diameter is that 23.0%, 0.6 particle diameter is that 15.0%, 1.18 particle diameter is that 21.0%, 2.36 particle diameter is 27.5%.
This graded broken stone CBR value is 74, and maximum dry density is 2.12g/cm
3.
Embodiment 5
The grating of coarse aggregate and fine aggregate is: coarse aggregate 75%, fine aggregate 25%.
Wherein, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 18.0% of 4.75 particle diameters; The rubble 18.0% of 9.5 particle diameters; The rubble 12% of 13.2 particle diameters; The rubble 15% of 16 particle diameters; The rubble 22% of 19 particle diameters; The rubble 15% of 26.5 particle diameters.
Wherein, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 5.0%, 0.15 particle diameter is that 11.5%, 0.3 particle diameter is that 25.0%, 0.6 particle diameter is that 14.0%, 1.18 particle diameter is that 18.5%, 2.36 particle diameter is 26.0%.
This graded broken stone CBR value is 75, and maximum dry density is 2.15g/cm
3.
Claims (4)
1. a method for macadam gradating design for high ferro roadbed, is characterized in that: comprise the following steps:
The first step, the standard square hole sieve that is respectively 0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm with sieve aperture sieves out single Stone, sieves respectively to obtain the rubble of 0.075,0.15,0.3,0.6,1.18,2.36,4.75,9.5,13.2,16,19,26.5,31.5 particle diameters;
Second step, using the rubble of 16 particle diameters as first step pellet, the rubble of 19 particle diameters is as second stage pellet, and gradient is mixed the two according to a certain percentage, by measuring CBR value Changing Pattern, determines the volume of second stage pellet; Using the rubble of 26.5 particle diameters as third stage pellet, mix in the compound of first and second grade of optimum proportion, gradient is mixed the two according to a certain percentage, by measuring CBR value Changing Pattern, determines the volume of third stage pellet; Adopting uses the same method determines respectively the optimum mix amount of the rubble of 13.2,9.5,4.75 particle diameters; Final definite 4.75mm is the rubble volume of each particle diameter in coarse aggregate above;
The 3rd step, the method for the K value Theoretical Calculation of use maximum density curve theory, determines that the following rubble of 4.75mm is the grating of fine aggregate;
The 4th step, mixes the fine aggregate of step 3 Theoretical Calculation with coarse aggregate, compound carries out CBR test, determines the grating of coarse aggregate and fine aggregate.
2. the method for macadam gradating design for a kind of high ferro roadbed according to claim 1, is characterized in that: in second step, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 15.0～20.0% of 4.75 particle diameters; The rubble 16.0～18.0% of 9.5 particle diameters; The rubble 12～14.5% of 13.2 particle diameters; The rubble 15～17% of 16 particle diameters; The rubble 21～22% of 19 particle diameters; The rubble 14.5～15% of 26.5 particle diameters; Preferably, in coarse aggregate, the rubble volume of each particle diameter is respectively: the rubble 20.0% of 4.75 particle diameters; The rubble 16.0% of 9.5 particle diameters; The rubble 12.4% of 13.2 particle diameters; The rubble 15.4% of 16 particle diameters; The rubble 21.4% of 19 particle diameters; The rubble 14.8% of 26.5 particle diameters.
3. the method for macadam gradating design for a kind of high ferro roadbed according to claim 1, it is characterized in that: in the 3rd step, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is 3.5～5.0%, 0.15 particle diameter is 10.0～11.5%, 0.3 particle diameter is 23.0～25.0%, 0.6 particle diameter is that 14.0～15.0%, 1.18 particle diameters are that 18.5～21%, 2.36 particle diameters are 26～27.5%; Preferably, in fine aggregate, the rubble volume of each particle diameter is respectively: 0.075 particle diameter is that 4.4%, 0.15 particle diameter is that 10.8%, 0.3 particle diameter is that 24.0%, 0.6 particle diameter is that 14.5%, 1.18 particle diameter is that 19.7%, 2.36 particle diameter is 26.6%.
4. the method for macadam gradating design for a kind of high ferro roadbed according to claim 1, is characterized in that: in the 4th step, the grating of coarse aggregate and fine aggregate is coarse aggregate 65%～75%, and fine aggregate is 25%～35%; Preferably, be 74.1%:25.9%.
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