CN114819212A - Dynamic partitioning method for asphalt pavement maintenance road section considering spatial continuity - Google Patents
Dynamic partitioning method for asphalt pavement maintenance road section considering spatial continuity Download PDFInfo
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Abstract
The invention discloses a dynamic partitioning method for an asphalt pavement maintenance road section considering spatial continuity, which changes a pavement condition evaluation itemized index grade partitioning critical value from a fixed value to a cross interval range; the road sections which are continuous in space and similar in disease severity are dynamically merged and divided according to the method, so that the problems that the road condition evaluation unit overlong covers the poor road condition of local road sections due to the fact that the conventional fixed-length evaluation unit cannot fully utilize automatic detection data, and the problem that the distribution of the same maintenance road sections is discrete and not beneficial to special maintenance construction organization are solved. The application of the invention can more accurately evaluate the use condition of the road surface, is beneficial to pertinently proposing a special maintenance scheme, is easy for construction organization and keeps the use performance of the road surface.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a dynamic partitioning method for an asphalt pavement maintenance road section considering spatial continuity.
Background
In the service process of the asphalt pavement, the influence factors of the technical conditions are complex, including traffic load, external environmental factors, pavement structure and the like, and the disease forms and maintenance modes of different road sections are greatly different. Therefore, when the asphalt pavement maintenance scheme is customized, reasonably dividing the maintenance road sections is the basis for improving the maintenance efficiency and effect. The existing ' road technical condition assessment Standard ' (JTG 5210-2018) ' (Standard) for short in the following) regulations in China are used for carrying out asphalt pavement technical condition assessment and maintenance requirement analysis by taking 1000m as a basic unit. This partitioning method, although simple, leads to the following two problems:
first, the evaluation result is an average value of 1000m length, which may cover the situation of poor technical conditions of local links and may not reflect the actual conditions.
Secondly, with the gradual maturity of the road surface detection automation technology in China, a statistical value is generally calculated by taking 10m or 20m as a unit when automatic detection data are stored, and the fixed-length evaluation of a 1000m basic unit cannot fully utilize the detection data.
On the other hand, if the regulations in the current standard of China are changed, the maintenance road sections are divided by the minimum detection unit of 10m, although the actual road surface condition and the disease condition can be reflected more accurately, the evaluation result is too discrete, and the maintenance scheme formulation and the construction organization cannot be effectively carried out. Some practitioners propose to use 100m as a basic evaluation unit, which is more accurate than the standard, and the basic unit of 100m is convenient for construction organization. Compared with the 10m basic unit, the scheme only improves the existing 1000m basic unit division mode, and still does not effectively solve the above-mentioned averaging problem and data utilization problem.
Under the background, some students and technicians begin to consider clustering the diseases, dynamically dividing, evaluating and maintaining road sections, for example, an ordered clustering method, a principal component-clustering method, an improved K-means clustering method and the like are adopted, and the defects of the methods are that the road section division results are relatively discrete and broken. Part of methods such as a dynamic asphalt pavement condition segmentation method based on kernel density estimation improve the spatial continuity, but the method needs a complex kernel function, the division limit of the pavement technical conditions of different levels is too strict, the road sections with similar damage degrees cannot be reasonably divided, the problem of discrete road section division is still not solved, and great difficulty is brought to the construction organization of the actual maintenance scheme.
In summary, a dynamic partitioning method for an asphalt pavement maintenance section, which can effectively utilize automated detection data, consider spatial continuity and similarity of front and rear sections and fully consider maintenance construction organization characteristics, is needed to provide technical support for a special maintenance decision of an asphalt pavement.
Disclosure of Invention
The invention aims to solve the technical problem that the defects of the prior art are overcome, and the dynamic partitioning method for the asphalt pavement maintenance road section considering the spatial continuity is provided, so that the problem that the conventional fixed-length evaluation unit cannot fully utilize automatic detection data, so that the road condition evaluation unit overlong covers the poor road condition of a local road section or is not beneficial to special maintenance construction organization can be solved. The method considers the similarity between the continuity of the space of the front and the rear road sections and the severity of the diseases of the front and the rear road sections, maintains the accuracy of automatic detection data, and facilitates the adoption of targeted maintenance measures to improve the road condition because the classified maintenance road sections have similar evaluation index results in terms.
In order to solve the technical problems, the invention adopts the technical scheme that:
a dynamic partitioning method for an asphalt pavement maintenance road section considering spatial continuity comprises the following steps.
And 2, detecting unit grade division and maintenance road section dynamic combination, and specifically comprises the following steps.
Step 21, setting a grade division standard, which is specifically shown in table 1:
TABLE 1 grading Standard of technical status of road
In Table 1, a, b, c and d are score values; meanwhile, a is more than b and more than c is more than d.
Step 22, grade division: and (3) grading each item index in the road surface technical condition indexes acquired in the step (1) according to the grading standard set in the step (21).
Step 23, merging the detection units: selecting one subentry index with lower overall rating grade from a plurality of subentry indexes of the technical condition indexes of the road surface as a combined subentry index; will be spatially continuous and at the same rating Y i The detection units are combined and marked as 1 maintenance road section and marked as B j In B j Maintaining road section, merging and automatically dividing into Y according to index grade i (ii) a Wherein i and j are sequentially numbered.
TABLE 2 road technical status itemized index grading Standard after reset
Step 4, merging the maintenance road sections, which specifically comprises the following steps:
step 41, determining a merging basic unit of the maintenance road section: the merging elementary units are defined as: 3 continuous maintenance road sections meet the conditions that the maintenance road sections on two sides have the same grade, the maintenance road section in the middle is an adjacent grade and marked as Y i 、Y i-1 、Y i Or Y i 、Y i+1 、 Y i (ii) a The maintenance road sections merged by the detection units in the step 2 are successively searched according to the sequence of the numbers from small to large, the number N of the continuous maintenance road sections conforming to the definition of the merged basic units is recorded, and the method for determining the merged basic units of the maintenance road sections according to the value N comprises the following steps:
if N is 3, it is directly determined as 1 merging basic unit.
If N is more than 3, selecting one maintenance road section with the minimum length in the middle N-2 maintenance road sections as a middle maintenance road section B j Taking 3 continuous maintenance road sections B j-1 、B j 、B j+1 And is denoted as 1 merging elementary unit.
Step 42, establishing merging basic unit merging conditions, specifically:
(1) when the middle maintenance road section B j Is of grade Y i-1 Then, the middle maintenance section B is searched j The minimum value X of the combined subentry index of each detection unit k Wherein k is a sequential number; if X k In Table 2Y i Within the grade judging range, the middle maintenance road section B is arranged j Is upgraded to Y i And is Y in the same level as the two sides i Maintenance section B j-1 And B j+1 Merge into one grade of Y i Maintenance section of (1), marked as B j-1 (ii) a Otherwise, the grade division condition of the original maintenance road section is continuously keptAnd (6) changing.
(2) When the middle maintenance road section B j Is of grade Y i+1 Then, the middle maintenance section B is searched j The minimum value X of the combined subentry index of each detection unit k (ii) a If X k In Table 2Y i Within the grade judging range, the middle maintenance road section B is arranged j Is reduced to Y i And is Y in the same level as the two sides i Maintenance section B j-1 And B j+1 Merge into one grade of Y i Maintenance section of (1), marked as B j-1 (ii) a Otherwise, the grade division condition of the original maintenance road section is continuously kept unchanged.
Step 43, maintenance road section primary merging: judging each merging basic unit in the step 41 according to the merging condition of the merging basic unit established in the step 42, and if the merging condition is met, merging 3 continuous maintenance road sections in the corresponding merging basic units into 1 maintenance road section; if not, the grades of the 3 continuous maintenance road sections in the corresponding merging basic units are kept unchanged;
step 44, dynamic circulation merging of maintenance road sections: and after the primary merging of the maintenance road sections is completed, repeating the steps 41 to 43 until merging basic units which can be merged do not appear any more.
Step 5, grade re-classification: and (4) renumbering the maintenance road sections which are dynamically and circularly combined in the step 44, calculating the average value of the combined itemized indexes of all the maintenance road sections, and grading according to the standards in the table 1.
In tables 1 and 2, a is 90, b is 80, c is 70, and d is 60.
Determining the standard deviation lambda in the step 3 according to the grade of the merging subentry index selected in the step 23; and when the average value of the merged sub-indexes on the integral detection road section is excellent, taking 2.5, taking 2.0 as good, taking 1.5, taking 1.0 again, and taking 0.5 as poor.
In step 23, a partial index with the lowest overall rating level is selected from a plurality of partial indexes of the road surface technical condition index to serve as a combined partial index.
In step 1, the technical condition indexes of the road surface comprise seven-item indexes which are respectively as follows: the road surface damage condition index PCI, the road surface running quality index RQI, the road surface rutting depth index RDI, the road surface jumping index PBI, the road surface abrasion index PWI, the road surface anti-skid performance index SRI and the road surface structural strength index PSSI.
The invention has the following beneficial effects:
1. according to the method, merging condition judgment of spatially adjacent road sections with similar grades and dynamic division of maintenance road sections are realized through fuzzy itemized index classification standard limit values.
2. The invention can effectively solve the problem that the existing fixed-length evaluation unit can not fully utilize automatic detection data, and the maintenance road sections dynamically divided according to the itemized indexes are dynamic merging results of road sections with similar grades, thereby being beneficial to the organization and implementation of special maintenance schemes.
3. The invention has simple logical relation, is easy to be programmed in various software and can be well integrated into various system modules.
4. The method can make full use of automatic detection data to dynamically distinguish and combine spatially continuous maintenance road sections, reduce the number of road sections to be maintained, increase the length of a single section of the road section to be maintained, greatly reduce construction organization and implementation difficulty, and improve implementation effect.
Drawings
Fig. 1 shows a flow chart of a dynamic division method of an asphalt pavement maintenance section considering spatial continuity according to the present invention.
Fig. 2 shows a merging schematic of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
And evaluating the current technical condition of a certain 10km highway pavement, and determining the sub-items to be maintained and the road sections to be maintained. The traditional road section division mode with the fixed length of 1000m has poor pertinence, the road section division mode with the fixed length of a 10m detection unit is too dispersed, the construction organization is extremely difficult, and the dynamic maintenance road section division process by adopting the method is as follows.
As shown in fig. 1, a dynamic division method of an asphalt pavement maintenance section considering spatial continuity includes the following steps.
According to the 'road technical condition evaluation Standard' (JTG 5210-2018), the technical condition indexes of the asphalt pavement are collected by an automatic detection tool, wherein the indexes comprise a pavement damage rate DR, an international flatness index IRI, a pavement track depth RD, a pavement jump PB, a pavement structure depth MPD, a transverse force coefficient SFC and a pavement deflection l. Wherein, the road surface structure depth MPD and the transverse force coefficient SFC are two-to-one indexes. The results of the measurements were recorded in units of 10m, as shown in Table 3.
Calculating seven-item evaluation index values of each unit, wherein the seven-item evaluation index values are respectively as follows: the road surface damage condition index PCI, the road surface running quality index RQI, the road surface rutting depth index RDI, the road surface jumping index PBI, the road surface abrasion index PWI, the road surface anti-skid performance index SRI and the road surface structural strength index PSSI.
In this embodiment, according to the actual situation, five subentry evaluation index values are calculated, which are respectively: the road surface damage condition index PCI, the road surface running quality index RQI, the road surface rutting depth index RDI, the road surface jumping index PBI and the road surface anti-skid performance index SRI, and the specific calculation results are shown in Table 4. The calculation process of each subentry evaluation index value is the prior art and is not described in detail here.
TABLE 3 pavement technical condition index automatic detection data statistical table
Table 4 statistical table of pavement technical condition index subentry evaluation index calculation data
| Starting point pile number | Terminal point stake number | PCI | RQI | RDI | PBI | SRI |
| K3+000 | K3+010 | 94.23 | 95.73 | 96.47 | 100 | 87.81 |
| K3+010 | K3+020 | 100.00 | 95.66 | 79.18 | 100 | 89.94 |
| K3+020 | K3+030 | 84.34 | 94.40 | 83.60 | 100 | 93.27 |
| K3+030 | K3+040 | 100.00 | 96.16 | 95.49 | 100 | 90.02 |
| K3+040 | K3+050 | 84.76 | 95.58 | 92.14 | 100 | 87.50 |
| K3+050 | K3+060 | 100.00 | 95.89 | 94.11 | 100 | 82.97 |
| K3+060 | K3+070 | 100.00 | 94.68 | 94.17 | 100 | 80.63 |
| K3+070 | K3+080 | 100.00 | 95.21 | 91.89 | 100 | 79.32 |
| K3+080 | K3+090 | 100.00 | 95.76 | 92.96 | 100 | 78.73 |
| K3+090 | K3+100 | 100.00 | 95.73 | 92.95 | 100 | 79.32 |
| ··· | ··· | ··· | ··· | ··· | ··· | ··· |
| K12+900 | K13+900 | 84.13 | 94.40 | 96.77 | 100 | 92.54 |
And 2, detecting unit grade division and maintenance road section dynamic combination, and specifically comprises the following steps.
Step 21, setting a grade division standard, which is specifically shown in table 1.
TABLE 1 grading Standard of technical status of road
In table 1, a, b, c and d are all score values, and are specifically selected according to actual needs; meanwhile, a is more than b and more than c is more than d. In the present embodiment, a is preferably 90 minutes, b is preferably 80 minutes, c is preferably 70 minutes, and d is preferably 60 minutes. Thus, table 1 above, transitions to:
TABLE 1 grading Standard of technical status of road
| Evaluation index | Superior food | Good wine | In | Next time | Difference (D) |
| PCI、RQI、RDI、PBI、PWI、SRI、PSSI | ≥90 | ≥80，＜90 | ≥70，＜80 | ≥60，＜70 | ＜60 |
Step 22, grade division
And (3) grading each item index in the road surface technical condition indexes acquired in the step (1) according to the grading standard set in the step (21).
Step 23, merging detection units
And selecting one of the multiple sub-indexes with lower overall evaluation grade (preferably lowest) from the multiple sub-indexes of the technical condition indexes of the road surface as a combined sub-index.
In this embodiment, the SRI is considered as a merging sub-index because the SRI is low overall and needs to be maintained at the earliest possible time, as a result of the integration of the automatic detection results shown in table 4.
Will be spatially continuous and at the same rating Y i The detection units are combined and marked as 1 maintenance road section and marked as B j In B j Maintaining road section, merging and automatically dividing into Y according to index grade i (ii) a Wherein i and j are sequentially numbered. The results of the test unit combinations are shown in table 5:
TABLE 5 statistical table for the grade of pavement technical condition index
A standard deviation λ greater than 0 is set according to the actual usage of the detected link, and the ranking criterion set in step 21 is reset according to the standard deviation λ, as shown in table 2:
TABLE 2 road technical status itemized index grading Standard after reset
In the present embodiment, a is preferably 90 minutes, b is preferably 80 minutes, c is preferably 70 minutes, and d is preferably 60 minutes. Thus, table 2 above, translates to:
TABLE 2 revised road technical status itemized index grading standards
Further, the standard deviation lambda is determined according to the grade of the merging subentry index selected in the step 23; and when the grade corresponding to the average value of the merged sub-index on the integral detection road section is superior, taking 2.5 as the good index, taking 2.0 as the good index, taking 1.5 as the good index, taking 1.0 as the good index, and taking 0.5 as the poor index. In this embodiment, the average value of the sectional indicators SRI as the basis for dynamically dividing the maintained section on the 10km expressway is calculated, and the result is 81.38, and the evaluation grade is good, so that the standard deviation λ value is set to 2; the original grade division critical value in table 1 is changed from a fixed value to an interval range according to the standard deviation λ, and the result is shown in table 6:
TABLE 6 revised road technical status itemized index grading standards
| Evaluation index | Superior food | Good wine | In | Next time | Difference (D) |
| SRI | ≥88 | ≥78，＜92 | ≥68，＜82 | ≥58，＜72 | ＜62 |
And 4, merging the maintenance road sections, which specifically comprises the following steps.
Step 41, determining a merging basic unit of the maintenance road section: the merging elementary units are defined as: the 3 continuous maintenance road sections meet the condition that the maintenance road sections on the two sides have the same grade, the middle maintenance road section is an adjacent grade, and the mark is Y i 、Y i-1 、Y i Or Y i 、Y i+1 、Y i (ii) a The maintenance road sections merged by the detection units in the step 2 are successively searched according to the sequence of the numbers from small to large, the number N of the continuous maintenance road sections conforming to the definition of the merged basic units is recorded, and the method for determining the merged basic units of the maintenance road sections according to the value N comprises the following steps:
if N is 3, it is directly determined as 1 merging basic unit.
If N is more than 3, selecting one maintenance road section with the minimum length in the middle N-2 maintenance road sections as a middle maintenance road section B j Taking 3 continuous maintenance road sections B j-1 、B j 、B j+1 And is denoted as 1 merging elementary unit.
Step 42, establishing merging basic unit merging conditions, specifically:
(1) when the middle maintenance road section B j Is of grade Y i-1 Then, the middle maintenance section B is searched j The minimum value X of the combined subentry index of each detection unit k Wherein k is a sequential number; if X k In Table 2Y i Within the grade judging range, the middle maintenance road section B is arranged j Is upgraded to Y i And is Y in the same level as the two sides i Maintenance section B j-1 And B j+1 Merge into one grade of Y i Maintenance section of (1), marked as B j-1 (ii) a Otherwise, the grade division condition of the original maintenance road section is continuously kept unchanged.
(2) When the middle maintenance road section B j Is of grade Y i+1 Then, the middle maintenance section B is searched j The minimum value X of the combined subentry index of each detection unit k (ii) a If X k In Table 2Y i Within the grade judging range, the middle maintenance road section B is arranged j Is reduced to Y i And is Y in the same level as the two sides i Maintenance section B j-1 And B j+1 Merge into one grade of Y i Maintenance section of (1), marked as B j-1 (ii) a Otherwise, the grade division condition of the original maintenance road section is continuously kept unchanged.
Step 43, maintenance road section primary merging: judging each merging basic unit in the step 41 according to the merging condition of the merging basic unit established in the step 42, and if the merging condition is met, merging 3 continuous maintenance road sections in the corresponding merging basic units into 1 maintenance road section; if not, the grades of the 3 continuous maintenance road sections in the corresponding merging basic units are kept unchanged;
step 44, dynamic circulation merging of maintenance road sections: and after the primary merging of the maintenance road sections is completed, repeating the steps 41 to 43 until merging basic units which can be merged do not appear any more.
Step 5, grade re-classification: and (4) renumbering the maintenance road sections which are dynamically and circularly combined in the step 44, calculating the average value of the combined itemized indexes of all the maintenance road sections, and grading according to the standards in the table 1.
The following highway in the above example further illustrates steps 4 to 5, since the data in table 5 is less, and the detection data of 10km is more, table 7 lists the search results of representative 3km road sections, and the pile numbers range from K5+000 to K8+ 000;
in table 7, the 1 st column is a road section number, the 2 nd and 3 rd columns are maintenance road section pile number ranges after the grade combination is evaluated according to the 10m detection unit in the step 2, the 4 th and 5 th columns are the lowest value and the highest value of the detection unit SRI in the ranges, and the 6 th column is a grade of the maintenance road section after the dynamic combination in the step 2.
TABLE 7 maintenance road section information formed by merging detection units according to SRI
Taking the data in table 7 as an example, the merging base unit retrieval and road segment dynamic merging process is as follows:
(1) and searching the evaluation levels in the 6 th column, and judging whether the adjacent 3 road sections meet the condition of merging the basic units, namely the levels of the 2 road sections on the two sides are the same, and the level difference of the middle road section is 1.
For example, the road segments B17, B18 and B19 have good grades of the road segments B17 and B19 at two sides, the road segment B18 in the middle has a good grade and a grade difference of 1, meet the requirement of a merging basic unit and can be used as the merging basic unit.
(2) The downward search is continued, the level of the link B20 is medium, that is, the links B18, B19 and B20 do not satisfy the merging basic unit requirement, so in this search, the number of links N satisfying the merging basic unit requirement is 3, the links B17, B18 and B19 are counted as 1 merging basic unit, and the merging condition is determined to see whether the links B18, B17 and B19 can be merged into the same link.
(3) The links B17, B18, and B19 belong to the case where the middle link level is 1 level higher than the both link levels, and therefore, the highest value of each detection unit SRI in the link B18 is searched, and it is determined whether the value falls within the good range in table 6, if so, the link B18 may be merged with the links B17 and B19, otherwise, the links B17 and B19 may be left as they are without merging.
As can be seen from column 5 of Table 7, the maximum value of the SRI of each detection unit in the road segment B18 is 94.25, while the good range of the SRI in Table 6 is (≧ 78, < 92), which is obviously out of range, therefore, 3 road segments are not merged and remain the same.
(4) Continuing to perform downward sequential search according to the process, and finding that 5 continuous adjacent road segments of B19, B20, B21, B22 and B23 meet the requirement of merging basic units, wherein the number of the road segments N is 5 > 3; then further calculating the lengths of the middle 3 road segments B20, B21 and B22, which are respectively 80m, 120m and 60m, and the shortest is the B22 road segment; therefore, the B22 segment is taken as the middle segment, and the B21, B22, and B23 segments are taken as 1 merging basic unit, and the merging condition determination is performed next.
(5) Since the B21, B22, and B23 links belong to the case where the middle link level is lower than the both link levels by 1 level, the highest and lowest values of the detection units SRI in the B22 link are searched, and it is determined whether the values fall within the good range in table 6, if yes, the B22 and the B21 and B23 links may be merged, otherwise, the links are not merged as they are.
As can be seen from column 4 of Table 7, the lowest value of the SRI of each detection unit in the B22 link is 78.39, while the good range of the SRI in Table 6 is (. gtoreq.78, < 92), and the lowest value is in the good range, so the B22 is merged with the B21 and the B23 links to be marked as the B21 link, and the new B21 link includes the initial B21, B22 and B23 links, and the link grade is good, as shown in Table 8.
(6) Repeating the search of the step 4 after the 1 st round of merging in the table 8, and finding that the road segments B19, B20 and B21 meet the merging basic unit requirement, and the number N of the road segments is 3, and the number is 1 merging basic unit; the links B19, B20, and B21 belong to the case where the middle link level is 1 level lower than the link levels on both sides, the minimum value of the SRI of each detection unit in the link B20 is 78.63, the good range of the SRI in table 6 is (≧ 78, < 92), and the minimum value is in the good range, so the 2 nd round merging is performed, and the link B20 is merged with the links B19, B21 to be marked as the link B19, which is in good link level, as shown in table 8.
(7) Repeating the search of the step 4 after the 2 nd round of merging in the table 8, and finding that 5 continuous adjacent road segments of B17, B18, B19, B24 and B25 meet the merging basic unit requirement, wherein the number of the road segments N is 5 & gt 3; then the lengths of the middle 3 road segments B18, B19 and B24 are further calculated, wherein the lengths are 490m, 860m and 270m respectively, and the shortest is the road segment B24; therefore, taking the B24 segment as the middle segment, taking the B19, B24 and B25 segments as 1 merging basic unit, and performing the next merging condition judgment; actually, since the merging condition determination has been performed on the B17, B18 and the initial B19 link, the result of the last determination is not affected after the initial B19 link is merged into the new B19 link, and the B17 and B18 links may be automatically ignored here, and the B19, B24, and B25 links are directly determined as merging base units.
The links C19, B24, and B25 belong to the case where the middle link level is 1 level higher than the both side link levels, the highest value of the SRI of each detection unit in the B24 link is 91.86, the good range of the SRI in table 6 is (≧ 78, < 92), and the lowest value is in the good range, so the 3 rd round of merging is performed, the B24 is merged with the links B19 and B25, and the link level is good, which is still denoted as the B19 link, as shown in table 8.
(8) And (3) repeating the retrieval of the step 4 according to the 2 nd round merged result in the table 8, and finding no new merged basic unit, so that the road sections merged in the 3 rd round are numbered again, the mean value of the itemized indexes in each road section is calculated, and the road sections are graded according to the standard in the table 1, and the result is shown in the table 8.
TABLE 8 SRI maintenance section dynamic division statistical comparison table
Table 8 records the maintenance road section dynamic division process and result of the example road section, and table 8 also shows the road section division result in a 1000m fixed length manner as a comparison. The division result shows that the maintenance road sections dynamically divided by the method have the following advantages no matter what maintenance scheme is adopted:
(1) the traditional 1000m fixed length averaging mode can cover the condition of poor technical condition of local road sections and cannot reflect the real condition; if the maintenance road sections are divided by 100m or other fixed lengths, the average value is still taken, and the real conditions of all the road sections cannot be fully reflected; the maintenance road sections are divided by the minimum detection unit of 10m, although the actual road surface condition and the disease condition can be reflected more accurately, the evaluation result is too discrete, and maintenance scheme formulation and construction organization cannot be effectively carried out; the method fully considers the condition and the use condition grade of each 10m detection unit in the automatic detection, completes the dynamic combination of the road sections on the basis, can ensure the road sections needing maintenance to be processed to the maximum extent, and is easy to construct and organize.
As shown in table 8, if the 3km section is divided into 3 sections according to a fixed length of 1000m, the results are all good, and the neutralization excellent part cannot be reflected, and the division condition by adopting other fixed lengths is the same; after the method is adopted to divide the road into 6 road sections, the B20 road section with poor result, the B18 road section with good result and the B21 road section with good result better reflect the condition of the original road surface.
(2) The scheme adopted in the method fully considers the spatial continuity of the road sections and the similarity of the disease grades of the adjacent road sections, and the division result is reasonable and feasible. As shown in table 8, merging the B20 and B22 links in the initial level middle to the two side links in the good level, considering that the SRI minimum values of the B20 and B22 links are also higher, it is proved that the overall link diseases are similar to the two sides; and secondly, after the road sections B20 and B22 are combined with the two sides, the space of each road section is continuous, and the road sections can be combined into a long road section with similar grade, so that the simplicity of construction scheme formulation and organization is improved under the condition of not influencing the maintenance effect.
(3) Compared with other dynamic maintenance road section dividing methods, the method adopts a direct fuzzy grade boundary method, and does not lose the accuracy of the result on the basis of greatly improving the practicability; meanwhile, the method has the advantages of clear logical relation, simple operation and easy realization of a process sequence language, and can be directly processed and finished in a result recording document or programmed into a small program to be embedded into the existing management system.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (5)
1. A dynamic partitioning method for an asphalt pavement maintenance road section considering spatial continuity is characterized by comprising the following steps: the method comprises the following steps:
step 1, automatically collecting technical condition indexes of the asphalt pavement: taking 10m as a detection unit, and automatically acquiring technical condition indexes of the road surface; the technical condition indexes of the road surface comprise a plurality of item sub-indexes;
step 2, detecting unit grade division and maintenance road section dynamic combination, which specifically comprises the following steps:
step 21, setting a grade division standard, which is specifically shown in table 1:
TABLE 1 grading Standard of technical status of road
In Table 1, a, b, c and d are score values; meanwhile, a is more than b and more than c is more than d;
step 22, grade division: grading each item index in the pavement technical condition indexes acquired in the step 1 according to the grading standard set in the step 21;
step 23, merging the detection units: selecting one subentry index with lower overall rating grade from a plurality of subentry indexes of the technical condition indexes of the road surface as a combined subentry index;will be spatially continuous and at the same rating Y i The detection units are combined and marked as 1 maintenance road section and marked as B j In B j Maintaining road section, merging and automatically dividing into Y according to index grade i (ii) a Wherein i and j are sequentially numbered;
step 3, resetting index grade division standard: a standard deviation λ greater than 0 is set according to the actual usage of the detected link, and the ranking criterion set in step 21 is reset according to the standard deviation λ, as shown in table 2:
TABLE 2 road technical status itemized index grading Standard after reset
Step 4, merging the maintenance road sections, which specifically comprises the following steps:
step 41, determining a merging basic unit of the maintenance road section: the merging elementary units are defined as: 3 continuous maintenance road sections meet the conditions that the maintenance road sections on two sides have the same grade, the maintenance road section in the middle is an adjacent grade and marked as Y i 、Y i-1 、Y i Or Y i 、Y i+1 、Y i (ii) a The maintenance road sections merged by the detection units in the step 2 are successively searched according to the sequence of the numbers from small to large, the number N of the continuous maintenance road sections conforming to the definition of the merged basic units is recorded, and the method for determining the merged basic units of the maintenance road sections according to the value N comprises the following steps:
if N is 3, directly determining as 1 merging basic unit;
if N is more than 3, selecting one maintenance road section with the minimum length in the middle N-2 maintenance road sections as a middle maintenance road section B j Taking 3 continuous maintenance road sections B j-1 、B j 、B j+1 And is marked as 1 merging basic unit;
step 42, establishing merging basic unit merging conditions, specifically:
(1) when the middle maintenance road section B j Is of grade Y i-1 Then, the middle maintenance section B is searched j The minimum value X of the combined subentry index of each detection unit k Wherein k is a sequential number; if X k In Table 2Y i Within the grade judging range, the middle maintenance road section B is arranged j Is upgraded to Y i And is Y in the same level as the two sides i Maintenance section B j-1 And B j+1 Merge into one grade of Y i Maintenance section of (1), marked as B j-1 (ii) a Otherwise, continuously keeping the grade division condition of the original maintenance road section unchanged;
(2) when the middle maintenance road section B j Is of grade Y i+1 Then, the middle maintenance section B is searched j The minimum value X of the combined subentry index of each detection unit k (ii) a If X k In Table 2Y i Within the grade judging range, the middle maintenance road section B is arranged j Is reduced to Y i And is Y in the same level as the two sides i Maintenance section B j-1 And B j+1 Merge into one grade of Y i Maintenance section of (2), marked as B j-1 (ii) a Otherwise, continuously keeping the grade division condition of the original maintenance road section unchanged;
step 43, maintenance road section primary merging: judging each merging basic unit in the step 41 according to the merging condition of the merging basic unit established in the step 42, and if the merging condition is met, merging 3 continuous maintenance road sections in the corresponding merging basic units into 1 maintenance road section; if not, the grades of the 3 continuous maintenance road sections in the corresponding merging basic units are kept unchanged;
step 44, dynamic circulation merging of maintenance road sections: after the initial merging of the maintenance road sections is completed, repeating the steps 41 to 43 until merging basic units which can be merged do not appear;
step 5, grade re-classification: and (4) renumbering the maintenance road sections which are dynamically and circularly combined in the step 44, calculating the average value of the combined itemized indexes of all the maintenance road sections, and grading according to the standards in the table 1.
2. The method for dynamically dividing an asphalt pavement maintenance section considering spatial continuity according to claim 1, wherein: in tables 1 and 2, a is 90, b is 80, c is 70, and d is 60.
3. The method for dynamically dividing an asphalt pavement maintenance section considering spatial continuity according to claim 1, wherein: determining the standard deviation lambda in the step 3 according to the grade of the merging subentry index selected in the step 23; and when the average value of the merged sub-indexes on the integral detection road section is excellent, taking 2.5, taking 2.0 as good, taking 1.5, taking 1.0 again, and taking 0.5 as poor.
4. The method for dynamically dividing an asphalt pavement maintenance section considering spatial continuity according to claim 1, wherein: in step 23, a partial index with the lowest overall rating level is selected from a plurality of partial indexes of the road surface technical condition index to serve as a combined partial index.
5. The method for dynamically dividing an asphalt pavement maintenance section considering spatial continuity according to claim 1, wherein: in step 1, the technical condition indexes of the road surface comprise seven-item indexes which are respectively as follows: the road surface damage condition index PCI, the road surface running quality index RQI, the road surface rutting depth index RDI, the road surface jumping index PBI, the road surface abrasion index PWI, the road surface anti-skid performance index SRI and the road surface structural strength index PSSI.
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