Permeable pavement life prediction method considering maintenance strategy

Abstract

The invention provides a permeable pavement life prediction method considering a maintenance strategy. The method comprises the following steps: determining an initial permeability coefficient, determining a permeability index attenuation coefficient, determining a ratio of the permeability coefficient to the initial permeability coefficient during blockage, determining a permeability recovery coefficient under a maintenance strategy, determining a maintenance time interval and calculating the service life of the permeable pavement under a maintenance condition. The method has the beneficial effects that a simple and effective service life prediction model is established based on the hypothesis that the permeability coefficient of the permeable pavement decays along with the time index in combination with the effects of the failure standard of the permeable pavement and the regular maintenance measures; through the model, accurate prediction of the service life of the permeable pavement under different maintenance strategies can be realized, a scientific basis is provided for design, construction and maintenance of the permeable pavement, and the method has the advantages of simple required test equipment and easy operation in the test process, and is easy to popularize and apply in actual engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement maintenance, and specifically to a method for predicting the service life of a permeable pavement considering maintenance strategies. Background Art

[0002] With the acceleration of the urbanization process, permeable pavements, as an environmentally friendly and sustainable urban infrastructure, have been widely used because they can effectively alleviate urban waterlogging and improve the urban ecological environment. Through its unique structural design, a permeable pavement enables rainwater to quickly penetrate into the soil layer below the pavement, thereby reducing surface runoff and improving the urban drainage capacity.

[0003] However, permeable pavements also face some problems during use, among which the most prominent is the gradual decrease in the permeability coefficient. Due to the blockage, aging of the pavement materials and the erosion of the external environment, the permeability of the permeable pavement gradually weakens over time, which not only affects its drainage effect but may also lead to the damage of the pavement structure, thus affecting the service life of the road and driving safety.

[0004] To evaluate the service life of permeable pavements, traditional life prediction methods often rely on empirical formulas or experimental data, but these methods often ignore the influence of maintenance strategies on the service life of permeable pavements. In fact,

[0005] Through regular maintenance, such as cleaning and dredging, the permeability coefficient of the permeable pavement can be effectively improved, thereby extending its service life. Therefore, it is particularly important to develop a method for predicting the service life of a permeable pavement considering maintenance strategies. At present, some studies have tried to incorporate maintenance strategies into the permeable pavement life prediction model, but these models are often too complex to be applied in actual engineering. At the same time, these models also lack a systematic study on the changes in the service life of permeable pavements under different maintenance strategies. Summary of the Invention

[0006] In view of this, the present invention provides a method for predicting the service life of a permeable pavement considering maintenance strategies, which includes the following steps:

[0007] S1: Determine the initial permeability coefficient K0 of the permeable pavement;

[0008] S2: Determine the attenuation coefficient A of the permeability index of the permeable pavement;

[0009] S3: Determine the ratio a1 of the permeability coefficient at the time of pavement blockage to the initial permeability coefficient;

[0010] S4: Determine the corresponding permeability recovery coefficient B under different maintenance strategies;

[0011] S5: Determine the maintenance time interval T1 of the permeable pavement;

[0012] S6: Calculate the service life of the permeable pavement under maintenance conditions using the following formula:

[0013]

[0014] Where T is the service life of the permeable pavement under maintenance conditions.

[0015] Furthermore, the process of determining the initial permeability coefficient K0 of the permeable pavement in step S1 is as follows: Use a double-ring infiltrometer to test the permeable pavement to obtain the initial permeability coefficient K0 of the permeable pavement.

[0016] Furthermore, the process of determining the attenuation coefficient A of the permeability index of the permeable pavement in step S2 is as follows: Monitor the permeable pavement for a long time through a double-ring infiltrometer, obtain the permeability coefficient data at different time points, and use these data to fit and obtain the attenuation coefficient A of the permeability index of the permeable pavement.

[0017] Furthermore, the value range of a1 in step S3 is 5% - 10%.

[0018] Furthermore, the process of determining the permeability recovery coefficient B under different maintenance strategies in step S4 is as follows: Select a maintenance strategy, use the selected maintenance strategy to maintain the pavement, measure the permeability coefficient of the pavement after maintenance multiple times, and fit the permeability coefficients under the same maintenance strategy to obtain the corresponding permeability recovery coefficient B under different maintenance strategies.

[0019] Furthermore, the maintenance strategies selected in step S4 are: flushing with high-pressure clean water and high-pressure flushing with sodium citrate solution.

[0020] Furthermore, the permeable pavement in step S1 is a brand-new pavement within 30 days after pouring.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. Improved prediction accuracy: By introducing a maintenance strategy, this method takes into account the restoration effect of maintenance measures on the permeability coefficient of the permeable pavement, making the prediction results more in line with the actual situation.

[0023] 2. Enhanced practicality: This method is not only applicable to life prediction under non-maintenance conditions but also applicable to life prediction under maintenance conditions, providing a more scientific basis for the maintenance management of permeable pavements.

[0024] 3. Easy to promote: This method requires simple test equipment, the test process is easy to operate, and the calculation process is relatively simple, making it easy to be promoted and applied in actual projects.

[0025] This method needs to comprehensively consider the attenuation law of the permeability coefficient of the permeable pavement, the failure criterion, and the effect of maintenance measures to accurately predict the service life of the permeable pavement. This method has broad application prospects and important social significance. Brief Description of the Drawings

[0026] Figure 1 It is a flowchart of a method for predicting the service life of a permeable pavement considering a maintenance strategy according to an embodiment of the present invention.

[0027] Figure 2 It is a fitting data graph of the attenuation coefficient A of the permeability index of the permeable pavement in a method for predicting the service life of a permeable pavement considering a maintenance strategy according to an embodiment of the present invention.

[0028] Figure 3 It is a fitting data graph of the permeability recovery coefficient B under different maintenance strategies in a method for predicting the service life of a permeable pavement considering a maintenance strategy according to an embodiment of the present invention. Detailed Embodiment

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] Please refer to Figure 1 , a method for predicting the service life of a permeable pavement considering a maintenance strategy of the present invention, the method includes the steps:

[0031] S1: Determine the initial permeability coefficient K0 of the permeable pavement; the process of determining the initial permeability coefficient K0 of the permeable pavement is as follows: select the pavement to be tested, where the pavement to be tested can be an actual pavement or a pavement pre-cast for the test in advance, and the pavement test time is a brand-new pavement within 30 days after the pavement is poured; then use a double-ring permeameter to test the permeable pavement to obtain the initial permeability coefficient K0 of the permeable pavement.

[0032] S2: Determine the attenuation coefficient A of the permeability index of the permeable pavement; the process of determining the attenuation coefficient A of the permeability index of the permeable pavement is as follows: long-term monitor the permeable pavement through a double-ring permeameter, obtain the real-time permeability coefficient data at different time points, and use these data to fit to obtain the attenuation coefficient A of the permeability index of the permeable pavement.

[0033] Refer to Figure 2 , where the ratio K / K0 of the real-time permeability coefficient data K at different time points to the initial permeability coefficient K0 decays exponentially. Input the ratio of the real-time permeability coefficient data K to the initial permeability coefficient K0 into the numerical fitting software, and the attenuation coefficient A of the permeability index of the permeable pavement can be obtained by fitting. In this embodiment, the value of A is -1.215.

[0034] S3: Determine the ratio a1 of the permeability coefficient at the time of clogging of the permeable pavement to the initial permeability coefficient; according to the actual situation at the time of clogging of the permeable pavement, determine the ratio a1 of the permeability coefficient of the permeable pavement at the time of clogging to the initial permeability coefficient, which generally can be taken as 5% - 10%. In this embodiment, a1 = 10%.

[0035] S4: Determine the corresponding permeability recovery coefficient B under different maintenance strategies; among them, different maintenance strategies correspond to different permeability recovery coefficients B, and the permeability recovery coefficients B corresponding to different maintenance strategies are obtained through test fitting. The maintenance strategies selected in step S4 are common road maintenance strategies.

[0036] S5: According to the actual situation, determine the time interval T1 for the maintenance of the permeable pavement.

[0037] S6: Calculate the service life of the permeable pavement under the condition of maintenance through the following formula:

[0038]

[0039] where T is the service life of the permeable pavement under the condition of maintenance.

[0040] In the preferred embodiment, the process of determining the permeability recovery coefficient B under different maintenance strategies in step S4 is as follows: Select a maintenance strategy, use the selected maintenance strategy to maintain the road surface, measure the permeability coefficient of the road surface after maintenance multiple times, and fit the permeability coefficients under the same maintenance strategy, so as to obtain the corresponding permeability recovery coefficients B under different maintenance strategies. The maintenance strategies selected in step S4 are: flushing with high-pressure clean water and flushing with a sodium citrate solution under high pressure. Refer to Figure 3 , where the value of the permeability recovery coefficient B under the maintenance strategy of flushing with high-pressure clean water is 14.9%, and the value of the permeability recovery coefficient B under the maintenance strategy of flushing with a sodium citrate solution under high pressure is 24.6%.

[0041] Using the above data values and formula, the calculated service life of the permeable pavement under the condition of maintenance (flushing with high-pressure clean water) is:

[0042]

[0043] where A = 1.215a -1 , a1 = 10%, B = 14.9%, T1 = 0.25a. The above a is the time unit year.

[0044] Table 1 Test data of flushing with high-pressure clean water

[0045]

[0046] As can be seen from the above table, when the test time reaches 3.5 years, the K / K0 test value is 0.099, which starts to be lower than the ratio a1 (10%) of the permeability coefficient at the time of pervious pavement blockage to the initial permeability coefficient. Its test service life is 3.5 years. This data is consistent with the pervious pavement life calculated using the practical formula of the present invention and the measured data (the error is within 2%), verifying the correctness of the practical formula of the present invention.

[0047] In this article, the front, back, up, down and other orientation words involved are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the clarity and convenience of expressing the technical solution. It should be understood that the use of the orientation words should not limit the scope of protection claimed in this application.

[0048] Without conflict, the above embodiments and the features in the embodiments in this article can be combined with each other.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for predicting the life of a permeable pavement taking into account maintenance strategies, characterized in that: The following steps are involved: S1: Determine the initial permeability coefficient K0 of the permeable pavement; S2: Determine the permeability exponential attenuation coefficient A of the permeable pavement; S3: Determine the ratio a1 of the permeability coefficient when the permeable pavement is blocked to the initial permeability coefficient; S4: Determine the permeability recovery coefficient B corresponding to different maintenance strategies; S5: Determine the permeable pavement maintenance time interval T1; S6: Calculate the service life of the permeable pavement under maintenance by the following formula: Where T is the service life of the permeable pavement under maintenance.

2. A method for predicting the life of a permeable pavement taking into account maintenance strategies according to claim 1, characterized in that: The process of determining the initial permeability coefficient K0 of the permeable pavement in step S1 is: using a double-ring permeameter to test the permeable pavement to obtain the initial permeability coefficient K0 of the permeable pavement.

3. The method for predicting the life of a permeable pavement taking into account maintenance strategy according to claim 1, characterized in that: The process of determining the permeability exponential attenuation coefficient A of the permeable pavement in step S2 is: monitoring the permeable pavement for a long time by using a double-ring permeameter, obtaining permeability coefficient data at different time points, and fitting the permeability exponential attenuation coefficient A of the permeable pavement using these data.

4. The method for predicting the life of a permeable pavement taking into account maintenance strategy according to claim 1, characterized in that: In step S3, the value range of a1 is 5% to 10%.

5. A method for predicting the life of a permeable pavement taking into account maintenance strategies according to claim 4, characterized in that: In step S3, the value range of a1 is 10%.

6. The method for predicting the life of a permeable pavement taking into account maintenance strategy according to claim 1, characterized in that: The process of determining the permeability recovery coefficient B under the maintenance strategy in step S4 is: selecting a maintenance strategy, maintaining the road surface using the selected maintenance strategy, measuring the permeability coefficient of the road surface after maintenance multiple times, fitting the permeability coefficient under the same maintenance strategy, and thus obtaining the corresponding permeability recovery coefficient B under different maintenance strategies.

7. A method for predicting the life of a permeable pavement taking into account maintenance strategies according to claim 6, characterized in that: The maintenance strategy selected in step S4 is: flushing with high-pressure water and flushing with high-pressure sodium citrate solution.

8. The method for predicting the life of a permeable pavement taking into account maintenance strategies according to claim 2, characterized in that: The permeable pavement in step S1 is a brand new pavement within 30 days after the pouring is completed.

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