CN109629347A - The method for evaluating ballastless track roadbed grout hazard rating - Google Patents
The method for evaluating ballastless track roadbed grout hazard rating Download PDFInfo
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- CN109629347A CN109629347A CN201811373155.4A CN201811373155A CN109629347A CN 109629347 A CN109629347 A CN 109629347A CN 201811373155 A CN201811373155 A CN 201811373155A CN 109629347 A CN109629347 A CN 109629347A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000011440 grout Substances 0.000 title abstract 13
- 238000011156 evaluation Methods 0.000 claims abstract description 38
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims abstract description 28
- 201000010099 disease Diseases 0.000 claims abstract description 26
- 238000007689 inspection Methods 0.000 claims abstract description 18
- 230000035945 sensitivity Effects 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims description 37
- 230000000740 bleeding effect Effects 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000013210 evaluation model Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract 1
- 238000013139 quantization Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 23
- 208000032843 Hemorrhage Diseases 0.000 description 20
- 208000034158 bleeding Diseases 0.000 description 20
- 238000005086 pumping Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- YBJHBAHKTGYVGT-ZKWXMUAHSA-N (+)-Biotin Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)O)SC[C@@H]21 YBJHBAHKTGYVGT-ZKWXMUAHSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- FEPMHVLSLDOMQC-UHFFFAOYSA-N virginiamycin-S1 Natural products CC1OC(=O)C(C=2C=CC=CC=2)NC(=O)C2CC(=O)CCN2C(=O)C(CC=2C=CC=CC=2)N(C)C(=O)C2CCCN2C(=O)C(CC)NC(=O)C1NC(=O)C1=NC=CC=C1O FEPMHVLSLDOMQC-UHFFFAOYSA-N 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- Railway Tracks (AREA)
Abstract
The invention discloses the methods of evaluation ballastless track roadbed grout hazard rating, comprising the following steps: 1) chooses any ballastless track roadbed grout workshop section, determine evaluation index, by testing the Sensitivity Factor with Calculation Estimation index；2) sensitive indicator is determined；Choosing has maximum | Sm| evaluation index be sensitive indicator；3) it establishes grout ranking model and calculates the grout grade of all grout workshop sections；4) to GstepThe grout workshop section of < 1 carries out depth inspection.The present invention measures, calculates and determine sensitive indicator by choosing any grout workshop section in quasi- evaluation roadbed section, and grout grade is only determined by measurement sensitive indicator size in other grout workshop sections, to carry out quantization assessment to grout hazard rating, it is reconnoitred in conjunction with live depth and carries out qualitative evaluation, grout disease ranking system is formed, provides scientific basis about the assessment and regulation of ballastless track roadbed grout disease for railway operation department.
Description
Technical Field
The invention relates to the technical field of high-speed railway ballastless track subgrade disease detection, in particular to a method for evaluating the slurry emission hazard grade of a ballastless track subgrade.
Background
In the high-speed railway operated in China, more than 70 percent of the mileage adopts a ballastless track structure. The ballastless track subgrade is a foundation for bearing the load of a track and a train, is a geotechnical building working under complex conditions, and is easy to generate subgrade diseases under the action, invasion and influence of geology, water, rainfall, climate and repeated dynamic load of the train. Since the operation is carried out, the high-speed roadbed diseases under part of special climatic and geological conditions are gradually shown.
In the spatial multilayer structure system of the high-speed railway ballastless track subgrade, the system sequentially consists of a steel rail, a fastener system, a track plate, a base plate and a subgrade from top to bottom. In order to prevent surface water from infiltrating into the interior of roadbed, roadbed sealing layers are set on two sides of base plate. In the multilayer structure system, a contact layer between a ballastless track rigid structure and a bed granular flexible medium is weak, the working environment is complex, and under the long-term action of engineering factors such as dynamic load of a high-frequency train, water and the like, the damage of a graded broken stone microstructure is deteriorated, so that the contact state of the ballastless track bed is deteriorated. The roadbed is a geotechnical structure filled with granular earth materials, is influenced by adverse factors such as dynamic load of a high-speed train in a complex and variable natural environment, and is in multi-field coupling and interaction influence such as a temperature field, a seepage field, a stress field and the like, so that the service state of the roadbed of the ballastless track of a local section is possibly degraded to generate diseases. Ballastless track subgrade slurry is a special disease form newly found on a high-speed railway.
The ballastless track subgrade slurry pumping changes the supporting condition and the force transmission path of the ballastless track, causes uneven foundation rigidity in the longitudinal direction, becomes a disturbance source of vibration of a train-line system, and aggravates the dynamic damage effect of a train on the ballastless track subgrade. And the structural characteristics of graded broken stones and the contact state of a base plate and a bed surface layer are changed, so that the rigidity of the roadbed is reduced, the vertical rigidity of a ballastless track structural system is not matched, and the comfort and the safety of train operation are seriously influenced. Slurry leakage of the ballastless track subgrade is worsened from occurrence to development, and the influence on the dynamic performance of the ballastless track subgrade structure and the safe operation of a train are different under different grades and different stages; analyzing from the aspect of disease characteristics, the slight slurry bleeding of the foundation bed causes the microscopic nonlinear contact between the base plate and the surface layer of the foundation bed; the bed is seriously overflowed, and the local contact failure of the base plate and the surface layer of the bed is caused; and continuously deteriorating, and finally causing the base plate to be suspended. The expression forms of diseases are different under different degrees of bed grouting, and corresponding improvement materials, processes and equipment are also greatly different, so that an assessment method for the grouting hazard level of the ballastless track subgrade is urgently needed to form a grouting hazard level assessment system for guiding the assessment and the improvement of the grouting diseases of the ballastless track subgrade.
At present, the slurry pumping mechanism of the ballastless track subgrade is not uniformly known, the severity of slurry pumping diseases is lack of a grading evaluation method, and a relevant standard is not formed. The problem can not be solved in time, so that the assessment and the treatment of the ballastless track subgrade slurry bleeding disease in practice lack of scientific decision basis.
Disclosure of Invention
The invention mainly aims to provide a method for evaluating the slurry leakage hazard grade of a ballastless track subgrade, so as to solve the problem that the assessment and the treatment of the slurry leakage hazard of the ballastless track subgrade in the prior art lack scientific decision basis.
In order to achieve the purpose, the invention provides a method for evaluating the slurry leakage hazard grade of a ballastless track subgrade. The method for evaluating the slurry leakage hazard grade of the ballastless track subgrade comprises the following steps:
1) selecting any ballastless track subgrade slurry-emitting working section, determining evaluation indexes, and measuring and calculating sensitivity factors of the evaluation indexes
The evaluation index is a dynamic response parameter of a ballastless track subgrade structure layer, the structure layer is any of a foundation bed, a base plate, a track plate and a subgrade sealing layer, and the dynamic response parameter is any of a vibration acceleration, a vibration speed and a vibration displacement;
wherein S ismAs a sensitivity factor, D0The evaluation index amplitude, D, of the section without bleeding during the running of the train1The evaluation index amplitude of the slurry-emitting section when the train runs is obtained; d0And D1Testing the train speed to obtain the train speed;
2) determination of sensitivity index
Choose to have the maximum | SmThe evaluation index of | is sensitiveIndexes;
3) establishing a pulp bleeding grade evaluation model and calculating the pulp bleeding grades of all pulp bleeding sections
Wherein, ImaxFor the allowable extreme value of the sensitive index in the most serious pulp bleeding section,for the amplitude of the sensitive index in the non-pulp-flowing section,the amplitude value is the sensitive index in the pulp-bleeding working section to be detected; i ismax、Andtesting the train speed to obtain the train speed;
4) for GstepThe slurry bleeding section less than 1 is subjected to depth inspection.
In the present invention, the sensitivity factor SmThe sign can represent that the power response parameter value is increased or reduced after the slurry is overflowed, the larger the absolute value of the sensitivity factor S is, the more sensitive the power response parameter is to the slurry-overflowing disease of the foundation bed is, so S is selectedmAnd determining the evaluation index with the maximum absolute value as a sensitive index for evaluating the bed slurry bleeding disease. When G isstepWhen the value is 1, the foundation bed does not emit slurry; when G isstepWhen the pulp leakage rate is less than 1, the pulp leakage rate is preferably divided into three assessment levels of light pulp leakage, serious pulp leakage and a void stage, and the three assessment levels are specifically as follows:
A. slight bleeding with the value range of 1 > Gstep≥0.8；
B. Severe bleeding, with a value range of 0.8 > Gstep≥0.3；
C. In the stage of emptying, the value range is more than 0.3 and more than Gstep≥0.1。
The ballastless track bed slurry pumping changes the contact state of a bed plate and a bed surface layer, causes disintegration of the dynamic performance between rigid and flexible contact layers of a ballastless track bed, causes damage and deterioration of the service performance of the bed due to a complex interface effect, forms a line to be longitudinally uneven, generates an additional excitation effect on vehicles, tracks and a bed system, and directly influences the durability of a ballastless track bed structure and the running performance of a train. The method selects any grouting working section in the roadbed section to be evaluated to measure, calculate and determine the sensitive index, and determines the grouting grade only by measuring the size of the sensitive index in other grouting working sections, so that the grouting hazard grade is quantitatively evaluated, qualitative evaluation is performed by combining site depth investigation, a grouting disease grade evaluation system is formed, a scientific basis is provided for the railway operation department on evaluation and treatment of ballastless track roadbed grouting diseases, and the method is small in workload and convenient to implement.
Further, theCalculated by the following formula:wherein n is the test frequency of the pulp bleeding section to be tested, Itest-iThe amplitude of the sensitivity index at the ith test is shown. Thereby liftingThe accuracy of (2).
Further, if and only if GstepIf < 0.8, proceed to step 4).
Further, the method also comprises the step of obtaining engineering design data of the road base section to be evaluated.
Further, the engineering design data comprises ballastless track structure type, service performance of an on-line waterproof sealing layer, characteristic distribution and statistics of slurry leakage diseases and maintenance reports of the previous slurry leakage diseases, and detection values and evaluation results of rail inspection vehicles.
Further, generating a grouting disease grade evaluation report which comprises the structure type of the ballastless track, the number of the mile piles of the roadbed section, the local climate condition, the detection time, the detection period, the speed per hour of the test train, the time course curve of the actually-measured dynamic response index, the sensitive index, the integrity condition of the expansion joint of the base plate, the integrity condition of the joint between the base plate and the roadbed sealing layer, Imax、 And ranking the results.
Further, the depth check includes a qualitative check and a quantitative check; the qualitative inspection comprises the crack type, position, degree and photo of the expansion joint of the base plate, the crack type, position, degree and disease photo of the joint position of the base plate and the roadbed sealing layer, the hanging degree and photo of the base plate, the detection of the slurry emission distribution form characteristics and the photo, and the existence of hanging empty visible to naked eyes on the base plate; the quantitative inspection comprises the steps of measuring expansion joint cracks of the base plate, measuring the geometrical distribution characteristics of slurry emission, measuring the side seams of the base plate and the roadbed sealing layer, and measuring the hanging height of the base plate.
Further, the running speed of the train in the step 1) and the step 3) is more than or equal to 200 km/h. Thus, the measured data is more instructive.
Therefore, the method for evaluating the ballast-free track subgrade slurry emission hazard grade has strong practicability, and the slurry emission disease grade evaluation system established by the method can provide scientific basis for the evaluation and treatment of the ballast-free track subgrade slurry emission diseases of the railway operation department, and has long-term significance.
The present invention will be further described with reference to the following embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The present invention will now be described more fully hereinafter. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is explained, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
Example 1
The method for evaluating the slurry leakage hazard grade of the ballastless track subgrade comprises the following steps:
1) and obtaining engineering design data of the road base section to be evaluated, wherein the engineering design data comprises ballastless track structure type, service performance of an on-line waterproof sealing layer, characteristic distribution and statistics of slurry leakage diseases at all times and maintenance reports, rail inspection vehicle detection values and evaluation results.
2) Selecting any ballastless track subgrade slurry-emitting working section, determining evaluation indexes, and measuring and calculating sensitivity factors of the evaluation indexes
The evaluation index is a dynamic response parameter of a ballastless track subgrade structure layer, the structure layer is any of a foundation bed, a base plate, a track plate and a subgrade sealing layer, and the dynamic response parameter is any of a vibration acceleration, a vibration speed and a vibration displacement;
wherein S ismAs a sensitivity factor, D0The evaluation index amplitude, D, of the section without bleeding during the running of the train1The evaluation index amplitude of the slurry-emitting section when the train runs is obtained; d0And D1All the train running speed is tested at 250 km/h;
the sensitivity factor values of the evaluation indexes obtained according to the above formula are shown in table 1.
Table 1 shows the sensitivity factor values of the respective evaluation indexes.
| Evaluation index | Sensitivity factor Sm |
| Base plate vibration acceleration | 1.38 |
| Base plate vibration velocity | 3.18 |
| Base plate vibration displacement | 5.14 |
| Track slab vibrationAcceleration of a vehicle | 1.22 |
| Vibration speed of track slab | 3.12 |
| Vibration displacement of track slab | 5.11 |
| Vibration acceleration of roadbed enclosed layer | 2.11 |
| Vibration speed of roadbed sealing layer | 3.05 |
| Vibration displacement of roadbed sealing layer | 5.01 |
| Acceleration of vibration of bed | -0.61 |
| Vibration speed of bed | -0.79 |
| Vibration displacement of bed | -0.92 |
3) And determining the sensitivity index.
As can be seen from Table 1, the base plate vibration displacement has a maximum | SmThe | value, so that the vibration displacement of the base plate is determined as a sensitive index;
4) establishing a pulp bleeding grade evaluation model and calculating the pulp bleeding grades of all pulp bleeding sections
Wherein, ImaxFor the allowable extreme value of the vibration displacement of the base plate at the most serious working section of pulp bleeding,the amplitude of the vibration displacement of the base plate at the non-pulp-flowing section,the amplitude of the vibration displacement of the base plate at the slurry pumping working section to be detected is obtained; wherein,wherein n is 3, Itest-iThe amplitude of the sensitive index in the ith test is obtained; i ismax、Andare all tested under the running speed of the train of 250 km/h.
5) For GstepThe pulp bleeding section less than 1 is subjected to deep inspection, specifically qualitative inspection and quantitative inspection; the qualitative inspection comprises the crack type, position, degree and photo of the expansion joint of the base plate, the crack type, position, degree and disease photo of the joint position of the base plate and the roadbed sealing layer, the hanging degree and photo of the base plate, the detection of the slurry emission distribution form characteristics and the photo, and the existence of hanging empty visible to naked eyes on the base plate; the quantitative inspection comprises the measurement of expansion joint cracks of the base plate (the width, depth and number of cracks), the measurement of the geometrical distribution characteristics of slurry emission (the distribution range and the accumulation thickness of slurry), the measurement of side seams of the base plate and a roadbed sealing layer (the width and length of the side seams), and the measurement of the hoisting height of the base plate. The expansion joint crack type mainly refers to the severity of the crack, for example, the expansion joint filling material cracks to form a through crack, but the integrity is kept; a plurality of through cracks exist, and the integrity is poor; the filling material for the expansion joint is completely crushed and brokenThe base plate is disengaged. The crack type at the joint position of the structural layer and the roadbed sealing layer in the sensitive index mainly refers to the width of a side seam, the side seam is regular, the width is less than 2mm, and the side seam is longitudinally and discontinuously distributed near an expansion joint along a line; the side seams are irregular and have the width larger than 2mm, and the roadbed closed layer can be seen to be separated from the base plate by naked eyes; the side seam width is more than 10mm, and the base plate can be seen to be suspended in severe conditions when the graded broken stones are exposed to the naked eyes.
6) Generating a grouting disease grade evaluation report which comprises the structure type of the ballastless track, the number of mile piles of the roadbed section, the local climate condition, the detection time, the detection period, the speed per hour of the test train, the time course curve of the actually measured dynamic response index, the sensitive index, the integrity condition of the expansion joint of the base plate, the integrity condition of the joint of the base plate and the roadbed sealing layer, Imax、And ranking the results.
Example 2
Compared with the embodiment 1, the method for evaluating the ballastless track subgrade slurry-emitting hazard grade of the embodiment has the difference of step 5), and specifically comprises the following steps: for G onlystepThe slurry bleeding section less than 0.8 is subjected to a depth check.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (8)
1. The method for evaluating the slurry leakage hazard grade of the ballastless track subgrade comprises the following steps:
1) selecting any ballastless track subgrade slurry-emitting working section, determining evaluation indexes, and measuring and calculating sensitivity factors of the evaluation indexes
The evaluation index is a dynamic response parameter of a ballastless track subgrade structure layer, the structure layer is any of a foundation bed, a base plate, a track plate and a subgrade sealing layer, and the dynamic response parameter is any of a vibration acceleration, a vibration speed and a vibration displacement;
wherein S ismAs a sensitivity factor, D0The evaluation index amplitude, D, of the section without bleeding during the running of the train1The evaluation index amplitude of the slurry-emitting section when the train runs is obtained; d0And D1Testing the train speed to obtain the train speed;
2) determination of sensitivity index
Choose to have the maximum | SmThe evaluation index of | is a sensitive index;
3) establishing a pulp bleeding grade evaluation model and calculating the pulp bleeding grades of all pulp bleeding sections
Wherein, ImaxFor the allowable extreme value of the sensitive index in the most serious pulp bleeding section,for the amplitude of the sensitive index in the non-pulp-flowing section,the amplitude value is the sensitive index in the pulp-bleeding working section to be detected; i ismax、Andtesting the train speed to obtain the train speed;
4) for GstepThe slurry bleeding section less than 1 is subjected to depth inspection.
2. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 1, wherein the method comprises the following steps: the above-mentionedCalculated by the following formula:wherein n is the test frequency of the pulp bleeding section to be tested, Itest-iThe amplitude of the sensitivity index at the ith test is shown.
3. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 1, wherein the method comprises the following steps: if and only if GstepIf < 0.8, proceed to step 4).
4. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 1, wherein the method comprises the following steps: also includes obtaining engineering design data of the road base section to be evaluated.
5. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 4, wherein the method comprises the following steps: the engineering design data comprises ballastless track structure type, on-line waterproof sealing layer service performance, past slurry leakage disease characteristic distribution, statistics and maintenance reports, and rail inspection vehicle detection values and evaluation results.
6. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 1, wherein the method comprises the following steps: and generating a grouting disease grade evaluation report which comprises the structure type of the ballastless track, the mile pile number of the roadbed section, the local climate condition, the detection time, the detection period, the speed per hour of the test train, the time course curve of the actually-measured dynamic response index, the sensitive index, the integrity condition of the expansion joint of the base plate, the integrity condition of the joint of the base plate and the roadbed sealing layer, Imax、And ranking the results.
7. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 1, wherein the method comprises the following steps: the depth inspection comprises qualitative inspection and quantitative inspection; the qualitative inspection comprises the crack type, position, degree and photo of the expansion joint of the base plate, the crack type, position, degree and disease photo of the joint position of the base plate and the roadbed sealing layer, the hanging degree and photo of the base plate, the detection of the slurry emission distribution form characteristics and the photo, and the existence of hanging empty visible to naked eyes on the base plate; the quantitative inspection comprises the steps of measuring expansion joint cracks of the base plate, measuring the geometrical distribution characteristics of slurry emission, measuring the side seams of the base plate and the roadbed sealing layer, and measuring the hanging height of the base plate.
8. The method for evaluating the grouting hazard level of the ballastless track subgrade of claim 1, wherein the method comprises the following steps: the running speed of the train in the steps 1) and 3) is more than or equal to 200 km/h.
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| CN109629347B (en) | 2020-04-17 |
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