CN106284034B - A kind of maintenance of surface method - Google Patents
A kind of maintenance of surface method Download PDFInfo
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- CN106284034B CN106284034B CN201610659600.8A CN201610659600A CN106284034B CN 106284034 B CN106284034 B CN 106284034B CN 201610659600 A CN201610659600 A CN 201610659600A CN 106284034 B CN106284034 B CN 106284034B
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- 238000012423 maintenance Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000006378 damage Effects 0.000 claims abstract description 170
- 201000010099 disease Diseases 0.000 claims abstract description 158
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims abstract description 158
- 238000005070 sampling Methods 0.000 claims abstract description 52
- 239000010410 layer Substances 0.000 claims description 188
- 239000002344 surface layer Substances 0.000 claims description 56
- 238000005553 drilling Methods 0.000 claims description 27
- 238000003801 milling Methods 0.000 claims description 15
- 230000008439 repair process Effects 0.000 claims description 12
- 238000005336 cracking Methods 0.000 claims description 8
- 238000011835 investigation Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000009429 distress Effects 0.000 abstract 1
- 239000010426 asphalt Substances 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003066 decision tree Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
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- Engineering & Computer Science (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a kind of maintenance of surface methods, including：According to the pavement distress in disease section, the typical disease on disease section is determined；Core boring sampling is carried out at the highest position of the frequency of occurrences of the typical disease；According to the core boring sampling as a result, determining the breakage rate of each structure sheaf in disease section；According to the breakage rate of each structure sheaf in disease section, corresponding maintenance strategy is selected.The present invention is by with the extent of the destruction of different structure layer inside disease section, selecting different maintenance strategies, avoiding the problem that validity and reliability is low caused by single data；To carry out core boring sampling at the highest position of the frequency of occurrences of typical disease, typical disease quantity does not exceed 4, without carrying out core boring sampling one by one to each disease, the rational quantity for reducing drill core sampling, the effective efficiency for improving holistic approach, and the selection of emphasis position while the reduction for also avoiding reliability.
Description
Technical Field
The invention relates to a pavement maintenance method, in particular to a pavement maintenance method.
Background
The asphalt pavement in China has a multi-layer structure and can be divided into a surface layer, a base layer and a cushion layer, and the surface layer can be divided into an upper surface layer, a middle surface layer and a lower surface layer; at present, the maintenance types of asphalt pavements can be generally divided into four types, namely daily maintenance, preventive maintenance, intermediate repair, major repair and the like. The road surface appearance indexes (breakage, flatness, rutting and skid resistance) obtained by general road condition investigation can be used for dividing daily maintenance and preventive maintenance; for the middle and major repair projects, two items of data of pavement structural strength and core drilling sampling are required to be added as the basis of the general survey index of the road condition to assist decision making. However, the existing detection and identification method does not perform overall analysis on the internal condition and the residual service life of the pavement structure, and is lack of scientific detection and evaluation methods, so that the classification scientificity of the major and middle maintenance types is insufficient.
Disclosure of Invention
In view of the above, the present invention provides a pavement maintenance method, so as to solve the problem that the identification method in the prior art does not consider the damage condition of each layer inside the pavement structure, and lacks scientific maintenance decision basis.
In order to solve the above problems, the present invention provides a pavement maintenance method, including: determining the diseases on the damaged road sections according to the road surface damage conditions of the damaged road sections; core drilling and sampling are carried out at the position with the highest occurrence frequency of diseases; determining the damage rate of each structural layer of the damaged road section according to the core drilling sampling result; and selecting a corresponding maintenance strategy according to the damage rate of each structural layer of the damaged road section.
Preferably, the determining the damage on the damaged road section according to the road surface damage condition of the damaged road section specifically includes: taking the disease type with the disease reduced damaged area accounting for more than 20% of the disease section as the disease; wherein the disease reduced damaged area ratio is the ratio of the disease reduced damaged area of a certain disease to the disease reduced damaged area of all the diseases.
Preferably, the core drilling and sampling at the position with the highest occurrence frequency of the disease further comprises: the sampling frequency for each disease type is not lower than 3-5 per kilometer, and the total sampling number of the disease types is not lower than 10.
Preferably, the core drilling and sampling at the position with the highest occurrence frequency of the disease specifically comprises: aiming at the diseases of the transverse cracks and the longitudinal cracks, the sampling positions of the type are the joint riding positions of the transverse cracks and the longitudinal cracks; aiming at the diseases of cracking and block cracking, the sampling position of the type is the position with the highest fracture density of the cracking and the block cracking; for track diseases, the sampling position of the type is the position where the track depth of each grade is maximum.
Preferably, the damaged road section structure is divided into an upper surface layer, a middle lower surface layer and a base layer from top to bottom; the process of determining the damage rate of each structural layer of the damaged road section according to the core drilling sampling result comprises the following steps:
when more than 80% of core samples are damaged in corresponding structural layers, the damage rate of the structural layers is directly replaced by the damage rate of road surface diseases;
when the corresponding structural layer of the core sample with the content of less than 30% is damaged, the damage rate of the structural layer is 0;
and when 30-80% of the core samples are damaged in the corresponding structural layer, calculating the damage rate of the structural layer based on the road surface disease damage rate.
Preferably, when the corresponding structural layer of the core sample between 30% and 80% is damaged, the structural layer damage rate is calculated based on the road surface disease damage rate, and the method specifically includes:
if 30-80% of core samples are damaged on the base layer, calculating the damage rate of the base layer diseases by the following formula;
wherein BDR is the damage rate of base layer diseases, DR is the damage rate of road surface diseases, n is the number of diseases, jiK is the ratio of the reduced damaged area of the i-th disease to the total reduced damaged area of the diseaseiThe proportion of the number of core samples damaged by the ith disease base layer to the total number of the disease core samples is shown;
if 30% -80% of the core sample is damaged at the middle and lower surface layers, the damage rate of the middle and lower surface layers is calculated by the following formula:
wherein UDR is the damage rate of the middle and lower surface layer diseases, DR is the damage rate of the road surface diseases, n is the number of the diseases, jiM is the ratio of the reduced damaged area of the i-th disease to the total reduced damaged area of the diseaseiThe ratio of the number of the damaged core samples of the lower layer in the i-th disease to the total number of the core samples of the disease.
Preferably, the damage rate of the upper layer diseases is the damage rate of the road surface diseases;
the road surface disease damage rate is calculated by the following formula:
wherein A isiThe damaged area of the i-th damaged pavement, A is the area of the pavement under investigation, wiIs the weight of the i-th road surface damage.
DR represents a road surface damage rate index specified in "road technical condition evaluation standards" (JTG H20-2007) to represent a road surface disease damage rate.
Preferably, the selecting a corresponding maintenance strategy according to the damage rate of each structural layer of the damaged road section specifically includes: and gradually utilizing the damage rates of the base layer, the middle and lower surface layers and the upper surface layer from bottom to top to judge the maintenance strategy to be selected by the damaged road section.
Preferably, the maintenance strategy to be selected for the damaged road section is determined by gradually utilizing the damage rates of the base layer, the middle-lower surface layer and the upper surface layer from bottom to top, and specifically comprises the following steps:
if the base layer damage rate of the damaged road section is higher than a first threshold value, the maintenance strategy of the damaged road section is structural overhaul, and road surface structure reconstruction is carried out;
if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, and the damage rate of the middle and lower layer damages is higher than a third threshold value, the maintenance strategy of the damaged road section is functional overhaul, and surface layer milling and re-paving are carried out;
if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, the damage rates of the middle and lower layer damages are not higher than a third threshold value, and the damage rate of the upper layer damage is higher than a fourth threshold value, the maintenance strategy of the damaged road section is intermediate repair, and surface layer milling and re-paving are carried out;
if the damage rate of the base layer diseases of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, the damage rates of the middle and lower layer diseases are not higher than a third threshold value, and the damage rate of the upper layer diseases are not higher than a fourth threshold value, the maintenance strategy of the damaged road section is intermediate repair, and surface layer milling and re-paving are carried out;
if the damage rate of the base layer of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, and the damage rate of the middle and lower surface layer is higher than a third threshold value, the maintenance strategy of the damaged road section is structurally overhaul, and surface layer milling and base layer reinforcing are carried out;
if the damage rate of the base layer diseases of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, the damage rates of the diseases of the middle and lower layers are not higher than a third threshold value, and the damage rates of the diseases of the upper layer are higher than a fourth threshold value, the maintenance strategy of the damaged road section is functional overhaul, surface layer milling is carried out, and paving reinforcement is added;
and if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, the damage rates of the middle and lower layer damages are not higher than a third threshold value, and the damage rates of the upper layer damages are not higher than a fourth threshold value, the maintenance strategy of the damaged road section is functional overhaul, and the old road is paved and reinforced.
Preferably, if the damaged road section is a highway section or a first-level road section, the first threshold value is 1%, the second threshold value is 80%, the third threshold value is 1%, and the fourth threshold value is 1%; if the road section with the fault is a second-level road section or a road section below the second level, the first threshold value is 2%, the second threshold value is 80%, the third threshold value is 2%, and the fourth threshold value is 2%.
Compared with the prior art, the invention has the following advantages:
1. different maintenance strategies are selected according to the damage degree of different structural layers in the damaged road section, so that the problems of low effectiveness and low reliability caused by single data are solved;
2. core drilling sampling is carried out at the position with the highest occurrence frequency of typical diseases, the number of the typical diseases does not exceed 4, core drilling sampling is not needed to be carried out on each disease one by one, the number of the core drilling sampling is reasonably reduced, the efficiency of the whole method is effectively improved, and the reliability is prevented from being reduced at the same time of selecting the key position;
3. through the analysis from the base layer and the lower layer below the base layer from bottom to top, the reasonability and the reliability of the method are ensured, and the complicated problem of the analysis from top to bottom is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a block diagram of an asphalt pavement layer of the present invention;
FIG. 2 is a flow chart of the present invention;
fig. 3 is a flow chart of the present invention.
Detailed Description
For the purpose of illustrating the invention in detail, preferred embodiments are given below with reference to the accompanying drawings.
FIG. 1 shows a bituminous pavement layer structure; the traditional asphalt pavement in China is mainly divided into a cushion layer, a base layer and a surface layer from bottom to top; the surface layer is further divided into a lower surface layer, a middle surface layer and an upper surface layer. The method of the invention is mainly divided into three layer structures of an upper layer, a middle lower layer (middle layer and lower layer), a base layer and a base layer, wherein the upper layer is positioned at the uppermost layer of the whole pavement structure, directly bears the repeated action of the vertical force and the horizontal force of the driving load and the vacuum suction force generated behind the vehicle body, and is most affected by the adverse effects of rainfall and temperature change, so the upper layer is required to be independently used as a consideration point; the middle surface layer and the lower surface layer both belong to structural layers with main structural strength and secondary bearing, and can be used as a consideration point; the base layer and the lower part of the base layer (two layers of the base layer cushion layer or three layers of the base layer, the cushion layer and the soil base) are taken as a point of consideration.
Referring now to FIG. 2, FIG. 2 illustrates a flow chart of a method of roadway maintenance as disclosed herein.
As shown in fig. 2, the present invention discloses a road surface maintenance method, including:
s11, determining typical diseases on the road section according to the road surface damage condition of the road section with the diseases;
s12, core drilling and sampling are carried out at the position with the highest occurrence frequency of the typical diseases;
s13, determining the damage rate of each structural layer of the road section according to the core drilling sampling result;
and S14, selecting a corresponding maintenance strategy according to the damage rate of each structural layer of the road section.
According to the method, different maintenance strategies are selected according to the damage degree of different structural layers in the damaged road section, so that the problems of low effectiveness and low reliability caused by single data are solved; core drilling sampling is carried out at the position with the highest occurrence frequency of typical diseases, the number of the typical diseases does not exceed 4, core drilling sampling is not needed to be carried out on each disease one by one, the number of the core drilling sampling is reasonably reduced, the efficiency of the whole method is effectively improved, and the reduction of reliability is avoided while the selection of the key position.
In some illustrative embodiments, the specific process in step S11 is, for example, to first divide the types of the diseases on the damaged road sections through observation and actual measurement, calculate the proportion of the reduced damaged area of the diseases in the total reduced damaged area of the diseases, and take the 3 diseases with the highest proportion as the typical diseases; or for example, the diseases with the disease reduced damaged area occupying ratio higher than the proportion threshold on the diseased road section are taken as typical diseases; the ratio threshold value range is between 15% and 30%; preferably, the duty threshold takes 20% as the optimal duty threshold.
in some illustrative embodiments, different types of road surface defects need to be considered in step S12, and core drilling and sampling need to be performed at different positions for different types of defects, wherein the types of road surface defects generally mainly include ① transverse and longitudinal cracks, block cracks, ③ ruts and other defects, and sampling points for the types of defects are shown in table 1.
Table 1: point location requirement table
1) Aiming at typical diseases of transverse cracks and longitudinal cracks, the sampling positions of the types are the joint riding positions of the transverse cracks and the longitudinal cracks;
2) aiming at typical diseases of cracks and block cracks, the sampling position of the type is the position where the cracks and the block cracks are most seriously damaged;
3) aiming at typical diseases of the ruts, the sampling position of the type is the position where the depth of each grade of rut is maximum;
4) for other diseases, the sampling position of the type is the position with the most serious damage of other diseases.
In some illustrative embodiments, the core drilling and sampling at the position where the frequency of occurrence of the typical disease is the highest further comprises:
the sampling frequency for each disease type is not lower than 3-5 per kilometer, and the total sampling number of the disease types is not lower than 10.
In some illustrative embodiments, based on the core drilling sampling results in step S13,
determining the breakage rate of each structural layer of the damaged road section, and specifically comprising the following steps:
in some illustrative embodiments, the damaged road section structure is divided into an upper layer, a middle lower layer, a base layer and a lower layer from top to bottom;
the process of determining the damage rate of each structural layer of the damaged road section according to the core drilling sampling result comprises the following steps:
when more than 80% of core samples are damaged in corresponding structural layers, the damage rate of the structural layers is directly replaced by the damage rate of road surface diseases;
when the corresponding structural layer of the core sample with the content of less than 30% is damaged, the damage rate of the structural layer is 0;
and when 30-80% of the core samples are damaged in the corresponding structural layer, calculating the damage rate of the structural layer based on the road surface disease damage rate.
In some illustrative embodiments, when the core sample between 30% and 80% is damaged in the corresponding structural layer, the structural layer damage rate is calculated based on the road surface disease damage rate, and the method specifically includes:
if 30-80% of core samples are damaged on the base layer, calculating the damage rate of the base layer diseases by the following formula;
wherein BDR is the damage rate of base layer diseases, DR is the damage rate of road surface diseases, n is the number of typical diseases, jiK is the ratio of the reduced damaged area of the i-type typical diseases to the reduced damaged area of the total diseasesiThe proportion of the number of core samples damaged by the i-th typical disease basal layer to the total number of the disease core samples is shown.
In some illustrative embodiments, the mid-lower layer disease damage rate is calculated by the following equation if between 30% and 80% of the core specimen is damaged in the mid-lower layer:
wherein UDR is the damage rate of the middle and lower surface layer diseases, DR is the damage rate of the road surface diseases, n is the number of typical diseases, jiM is the proportion of the reduced damaged area of the i-type typical diseases to the reduced damaged area of the total diseasesiThe ratio of the number of the damaged core samples of the lower layer in the i-th typical disease to the total number of the core samples of the disease.
In some illustrative embodiments, the upper layer damage rate is the road surface damage rate;
the road surface disease damage rate is calculated by the following formula:
wherein A isiIs the damaged area (unit is m) of the i-th typical damaged pavement2) A is the area of the road surface investigated (i.e. the product of the investigation length and the effective road surface width, in m)2)，wiIs the weight of the i-th road surface damage.
DR represents a road surface damage rate index specified in "road technical condition evaluation standards" (JTG H20-2007) to represent a road surface disease damage rate.
Preferably, the weight of the i-th type of road surface damage is taken according to the following table
In some illustrative embodiments, the methods and formulas for the upper layer disease damage rate, the middle and lower layer disease damage rate, and the base layer disease damage rate can be referred to table 2:
in some illustrative embodiments, the selecting, in step S14, a corresponding maintenance strategy according to the damage rate of each structural layer of the damaged section specifically includes: the maintenance strategy to be selected for the damaged road section is judged in four stages by gradually utilizing the damage rates of the base layer, the middle and lower surface layers and the upper surface layer from bottom to top, as shown in table 3:
in some illustrative embodiments, the determining, by gradually using the damage rates of the base layer, the middle-lower layer, and the upper layer from bottom to top, a maintenance policy to be selected for the damaged road section specifically includes:
if the base layer damage rate of the damaged road section is higher than a first threshold value, the maintenance strategy of the damaged road section is structural overhaul, and road surface structure reconstruction is carried out;
if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, and the damage rate of the middle and lower layer damages is higher than a third threshold value, the maintenance strategy of the damaged road section is functional overhaul, and surface layer milling and re-paving are carried out;
if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, the damage rates of the middle and lower layer damages are not higher than a third threshold value, and the damage rate of the upper layer damage is higher than a fourth threshold value, the maintenance strategy of the damaged road section is intermediate repair, and surface layer milling and re-paving are carried out;
if the damage rate of the base layer diseases of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, the damage rates of the middle and lower layer diseases are not higher than a third threshold value, and the damage rate of the upper layer diseases are not higher than a fourth threshold value, the maintenance strategy of the damaged road section is intermediate repair, and surface layer milling and re-paving are carried out;
if the damage rate of the base layer of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, and the damage rate of the middle and lower surface layer is higher than a third threshold value, the maintenance strategy of the damaged road section is structurally overhaul, and surface layer milling and base layer reinforcing are carried out;
if the damage rate of the base layer diseases of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, the damage rates of the diseases of the middle and lower layers are not higher than a third threshold value, and the damage rates of the diseases of the upper layer are higher than a fourth threshold value, the maintenance strategy of the damaged road section is functional overhaul, surface layer milling is carried out, and paving reinforcement is added;
and if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, the damage rates of the middle and lower layer damages are not higher than a third threshold value, and the damage rates of the upper layer damages are not higher than a fourth threshold value, the maintenance strategy of the damaged road section is functional overhaul, and the old road is paved and reinforced.
The invention ensures the rationality and reliability of the method and avoids the complicated problem of analysis from top to bottom by analyzing from the base layer and the lower layer below the base layer from bottom to top.
For the values of the first threshold, the second threshold, the third threshold and the fourth threshold, the invention discloses preferred values of the thresholds, as shown in table 4:
wherein,
if the damaged road section is a high-speed road section or a first-level road section, taking 1% as the first threshold value A, 80% as the second threshold value B, 1% as the third threshold value C and 1% as the fourth threshold value D;
if the damaged road section is a second-level road section or a road section below the second level, the first threshold value A is 2%, the second threshold value B is 80%, the third threshold value C is 2%, and the fourth threshold value D is 2%.
In some illustrative embodiments, the present invention may be applied to asphalt pavement for inspecting the asphalt pavement and assessing the maintenance strategy of the asphalt pavement.
As shown in fig. 3, the present invention also discloses a preferred embodiment of the pavement maintenance method, which specifies the complete analysis process from detailed pavement damage investigation, special core drilling sampling, pavement structure layer integrity evaluation and maintenance type division. Wherein:
(1) detailed investigation of pavement diseases
According to the regulations of the technical condition assessment Standard for roads (JTG H20), the positions and the severity of the types of various road defects are respectively recorded, the folded damaged areas of the various road defects are calculated, and the defects for repairing cracks are still counted as cracks. The method provides that the disease types with the reduced damaged area accounting for more than 20% of the total reduced damaged area are called typical diseases, and if the number of the typical diseases is more than 3, the disease types of the first three are taken for special analysis.
(2) Develop special core drilling sampling
1) Coring position: aiming at typical disease types, core drilling and sampling are carried out at the position where the occurrence frequency is the most (such as penetrating through a full-width crack, a driving wheel track belt and the like); the sampling point position should meet the requirements of table 1;
2) sampling frequency: for each typical disease type, the sampling frequency is not less than 3-5/km, and the total sample size is not less than 10;
3) data requirements are as follows: the core drilling sampling depth is required to reach the pavement base layer, and the disease development layer position and the damage degree of each structural layer are recorded.
(3) Evaluation of pavement structural integrity
1) Evaluation target: the method divides the asphalt pavement structure layer into a base layer, a lower layer, a middle lower layer, an upper layer and the like, and evaluates the structural integrity of the asphalt pavement structure layer respectively;
2) evaluation indexes are as follows: for the three evaluation objects, three indexes of a base layer damage rate (BDR), a middle and lower layer damage rate (UDR) and an upper layer Damage Rate (DR) are respectively adopted for representing;
3) the calculation method of each index is shown in table 2, and the core drilling and sampling of the typical disease position are found as follows:
1) if more than 80% of core samples are damaged in the corresponding structural layers, the diseases can be considered to be developed to the corresponding structural layers, and the damage rate of the structural layers can be directly replaced by the damage rate of road surface diseases;
2) if only less than 30% of the core samples are damaged in the structural layer, the diseases are considered to be not developed to the structural layer basically, the whole structural layer is still intact, and the damage rate is 0;
3) if the core sample rate of the structural layer is between 30% and 80%, it is considered that the structural layer is damaged to different degrees, and maintenance measures need to be determined according to the influence degree of damage.
(4) Maintenance type division
1) Constructing a major and middle repair maintenance type division decision tree by using a pavement structural integrity evaluation index system, as shown in table 3;
2) firstly, judging whether a pavement base structure is seriously damaged or not, if the pavement base structure cannot be continuously utilized, judging that the corresponding maintenance type belongs to structural overhaul, wherein the judged index is a base damage rate BDR;
3) on the premise that the basic structure can still be continuously utilized, the overall structural strength condition of the pavement needs to be further judged, and two grades of sufficient and insufficient structural strength can be divided through the pavement structural strength index PSSI; for the road section with sufficient structural strength, the maintenance type can be determined as medium repair or functional overhaul; for the road section with insufficient structural strength, the maintenance type is selected from functional overhaul or structural overhaul;
4) for the road sections with the base layer structure capable of being continuously utilized and sufficient pavement structure strength, the damage degree of the middle and lower layer structures of the pavement is further evaluated by using the middle and lower layer damage rate UDR; if the lower layer structure is judged to be damaged greatly and cannot be used continuously, the road section maintenance type is judged to be functional overhaul; if the whole middle and lower surface layer structure is still intact and only the upper surface layer structure is damaged in different degrees, the maintenance type can be determined as middle repair;
5) for the road sections of which the base layer structure can be continuously utilized but the strength of the road surface structure is insufficient, the damage degree of the middle and lower layer structure of the road surface is evaluated by further utilizing the middle and lower layer damage rate UDR; if the lower layer structure is judged to be damaged greatly and cannot be used continuously, the section maintenance type is judged to be structural overhaul; if the whole middle and lower surface layer structure is still intact, only the upper surface layer structure is damaged in different degrees, and the maintenance type can be determined as functional overhaul due to the need of structural reinforcement;
6) finally, the road surface layer breakage rate index DR is utilized for subdivision, and more targeted maintenance measures can be taken for different road sections with the same maintenance type.
7) The grading standards of each index can be determined and adjusted according to the current related industry standards and maintenance experience, and the method provides an index value range reference range, which is shown in table 4.
The method provided by the invention is obtained by summarizing a large number of maintenance design project experiences, the road condition survey data can be fully matched with the maintenance type judgment result, the analysis result is matched with the road section maintenance requirement condition, and a solid foundation is laid for promoting the accuracy of asphalt pavement maintenance requirement analysis.
Any modifications, equivalents, improvements and the like which are within the spirit and principle of the present invention and which are made to the embodiments of the present invention are included in the scope of the present invention.
Claims (9)
1. A method of maintaining a pavement, comprising:
determining the diseases on the damaged road sections according to the road surface damage conditions of the damaged road sections;
the damaged road section structure is divided into an upper surface layer, a middle lower surface layer and a base layer from top to bottom;
core drilling and sampling are carried out at the position with the highest occurrence frequency of diseases;
determining the damage rate of each structural layer of the damaged road section according to the core drilling sampling result; the specific process comprises the following steps: when more than 80% of core samples are damaged in corresponding structural layers, the damage rate of the structural layers is directly replaced by the damage rate of road surface diseases; when the corresponding structural layer of the core sample with the content of less than 30% is damaged, the damage rate of the structural layer is 0; when 30-80% of core samples are damaged in corresponding structural layers, calculating the damage rate of the structural layers based on the damage rate of the road surface diseases;
and selecting a corresponding maintenance strategy according to the determined damage rate of each structural layer of the damaged road section.
2. The method for maintaining the pavement according to claim 1, wherein the determining the pavement damage condition of the damaged road section according to the pavement damage condition of the damaged road section specifically comprises:
taking the disease type with the disease reduced damaged area accounting for more than 20% of the disease section as the disease;
wherein the disease reduced damaged area ratio is the ratio of the disease reduced damaged area of a certain disease to the disease reduced damaged area of all the diseases.
3. The method of claim 1, wherein the core drilling and sampling are performed at a position where the frequency of occurrence of the damage is the highest, and further comprising:
the sampling frequency for each disease type is not lower than 3-5 per kilometer, and the total sampling number of the disease types is not lower than 10.
4. The method for maintaining a pavement according to claim 1, wherein the core drilling and sampling are performed at a position where the frequency of occurrence of the damage is the highest, and specifically comprises:
aiming at the diseases of the transverse cracks and the longitudinal cracks, the sampling positions of the type are the joint riding positions of the transverse cracks and the longitudinal cracks;
aiming at the diseases of cracking and block cracking, the sampling position of the type is the position with the highest fracture density of the cracking and the block cracking;
for track diseases, the sampling position of the type is the position where the track depth of each grade is maximum.
5. The method of maintaining a road surface according to claim 1,
when the core sample between 30% and 80% is damaged in the corresponding structural layer, calculating the damage rate of the structural layer based on the damage rate of the road surface diseases, and specifically comprising the following steps:
if 30-80% of core samples are damaged on the base layer, calculating the damage rate of the base layer diseases by the following formula;
wherein BDR is the damage rate of base layer diseases, DR is the damage rate of road surface diseases, n is the number of diseases, jiK is the ratio of the reduced damaged area of the i-th disease to the total reduced damaged area of the diseaseiThe proportion of the number of core samples damaged by the ith disease base layer to the total number of the disease core samples is shown;
if 30% -80% of the core sample is damaged at the middle and lower surface layers, the damage rate of the middle and lower surface layers is calculated by the following formula:
wherein UDR is the damage rate of the middle and lower surface layer diseases, DR is the damage rate of the road surface diseases, n is the number of the diseases, jiM is the ratio of the reduced damaged area of the i-th disease to the total reduced damaged area of the diseaseiThe ratio of the number of the damaged core samples of the lower layer in the i-th disease to the total number of the core samples of the disease.
6. The pavement maintenance method according to claim 1, wherein the upper layer damage rate is the road surface damage rate;
the road surface disease damage rate is calculated by the following formula:
wherein A isiThe damaged area of the i-th damaged pavement, A is the area of the pavement under investigation, wiIs the weight of the i-th road surface damage.
7. The method for maintaining the pavement according to claim 1, wherein the selecting of the corresponding maintenance strategy according to the damage rate of each structural layer of the damaged section specifically comprises:
and gradually utilizing the damage rates of the base layer, the middle and lower surface layers and the upper surface layer from bottom to top to judge the maintenance strategy to be selected by the damaged road section.
8. The method for maintaining the pavement according to claim 7, wherein the maintenance strategy to be selected for the damaged road section is determined by gradually utilizing the damage rates of the base layer, the middle and lower surface layers and the upper surface layer from bottom to top, and specifically comprises:
if the base layer damage rate of the damaged road section is higher than a first threshold value, the maintenance strategy of the damaged road section is structural overhaul, and road surface structure reconstruction is carried out;
if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, and the damage rate of the middle and lower layer damages is higher than a third threshold value, the maintenance strategy of the damaged road section is functional overhaul, and surface layer milling and re-paving are carried out;
if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, the damage rates of the middle and lower layer damages are not higher than a third threshold value, and the damage rate of the upper layer damage is higher than a fourth threshold value, the maintenance strategy of the damaged road section is intermediate repair, and surface layer milling and re-paving are carried out;
if the damage rate of the base layer diseases of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is higher than a second threshold value, the damage rates of the middle and lower layer diseases are not higher than a third threshold value, and the damage rate of the upper layer diseases are not higher than a fourth threshold value, the maintenance strategy of the damaged road section is intermediate repair, and surface layer milling and re-paving are carried out;
if the damage rate of the base layer of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, and the damage rate of the middle and lower surface layer is higher than a third threshold value, the maintenance strategy of the damaged road section is structurally overhaul, and surface layer milling and base layer reinforcing are carried out;
if the damage rate of the base layer diseases of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, the damage rates of the diseases of the middle and lower layers are not higher than a third threshold value, and the damage rates of the diseases of the upper layer are higher than a fourth threshold value, the maintenance strategy of the damaged road section is functional overhaul, surface layer milling is carried out, and paving reinforcement is added;
and if the base layer damage rate of the damaged road section is not higher than a first threshold value, the overall strength of the road surface is not higher than a second threshold value, the damage rates of the middle and lower layer damages are not higher than a third threshold value, and the damage rates of the upper layer damages are not higher than a fourth threshold value, the maintenance strategy of the damaged road section is functional overhaul, and the old road is paved and reinforced.
9. The method according to claim 8, wherein if the damaged road section is a highway section or a first-class road section, the first threshold value is 1%, the second threshold value is 80%, the third threshold value is 1%, and the fourth threshold value is 1%;
if the road section with the fault is a second-level road section or a road section below the second level, the first threshold value is 2%, the second threshold value is 80%, the third threshold value is 2%, and the fourth threshold value is 2%.
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| CN107798177B (en) * | 2017-10-13 | 2021-01-26 | 东南大学 | Method for determining optimal pavement maintenance opportunity based on pavement performance models before and after maintenance |
| CN109086981A (en) * | 2018-07-16 | 2018-12-25 | 中国公路工程咨询集团有限公司 | Method, electronic equipment and the system that section divides |
| CN109356007A (en) * | 2018-09-10 | 2019-02-19 | 湖北公路智能养护科技股份有限公司 | Bituminous pavement motive rut disease screening method |
| CN109914208B (en) * | 2019-04-15 | 2021-02-12 | 英达热再生有限公司 | Hot regeneration repairing method for optimizing asphalt mixture ratio of road surface linear change road section |
| CN111041927A (en) * | 2019-11-21 | 2020-04-21 | 江苏永联精筑建设集团有限公司 | Method for repairing damaged asphalt concrete pavement |
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