CN119230035A - A method and device for determining the total thickness of pavement structure based on frost heave - Google Patents
A method and device for determining the total thickness of pavement structure based on frost heave Download PDFInfo
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Abstract
The invention relates to a method and equipment for judging the total thickness of a pavement structure based on frost heaving, which can acquire the thickness and thermal physical coefficient of each layer of a pavement, calculate the comprehensive thermal physical coefficient when the thickness of a soil base layer is the assumed freezing thickness, further calculate the maximum freezing depth of the pavement, calculate the thickness of the pavement structure layer, calculate the freezing depth of the soil base layer, replace the assumed freezing thickness of the soil base layer with the freezing depth of the soil base layer if the freezing depth of the soil base layer is not equal to the assumed freezing thickness, repeatedly execute, calculate the frost heaving of the soil base according to the freezing depth of the soil base layer and the average frost heaving rate of soil, judge whether the frost heaving of the soil base is smaller than the allowable frost heaving height of the pavement, and output a judging result. It can be understood that the technical scheme disclosed by the invention is suitable for quantitative determination of the structural layer thickness of the cement concrete pavement and the asphalt concrete pavement of airports and highways, and fills the gap of quantitative calculation and determination of the total structural layer thickness of the pavement.
Description
Technical Field
The invention relates to the technical field of pavement structures, in particular to a method and equipment for judging the total thickness of a pavement structure based on frost heaving quantity.
Background
The pavement structure is important, for example, the pavement engineering of an airport flight area is the most important infrastructure of an airport, and is one of the engineering with the highest investment ratio of the airport engineering. The pavement not only bears the load of the airplane, but also is influenced by the environment such as air temperature, water and the like, and particularly in frozen areas, the anti-freezing of the pavement is important. If the thickness of the anti-freezing layer of the pavement structure is insufficient, the use of the pavement can be influenced, and the flight safety is influenced.
In the current pavement specification, the anti-freezing requirement of the pavement structural layer is only specified from a qualitative angle, namely, different frost heaving depths correspond to the minimum anti-freezing layer thickness, and no corresponding calculation method exists for determining the total pavement structural thickness through the frost heaving amount.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a device for determining the total thickness of a pavement structure based on frost heaving, so as to solve the problem that in the prior art, only the antifreeze requirement of a pavement structure layer is specified from a qualitative aspect.
According to a first aspect of an embodiment of the present invention, there is provided a method for determining a total thickness of a pavement structure based on frost heaving, including:
S11, obtaining the thickness and the thermal physical coefficient of each layer in the pavement structure layer, obtaining the assumed freezing thickness and the thermal physical coefficient of the soil base layer, and calculating to obtain the comprehensive thermal physical coefficient according to the thickness and the thermal physical coefficient of each layer;
S12, calculating a maximum freezing depth of the road surface according to the comprehensive thermal physical coefficient, a preset road base humidity coefficient, a preset road base section form coefficient and a geodetic standard freezing depth;
S13, calculating the thickness of the pavement structure layer according to the thickness of each layer in the pavement structure layer;
s14, calculating the freezing depth of the soil base layer according to the maximum freezing depth of the road surface and the thickness of the road surface structural layer;
S15, judging whether the freezing depth of the soil base layer is equal to the assumed freezing thickness, if not, replacing the assumed freezing thickness of the soil base layer in the step S11 with the freezing depth of the soil base layer, and repeatedly executing the steps S11 to S15, if so, executing the step S16;
s16, calculating the frost heaving capacity of the soil base according to the freezing depth of the soil base and the average frost heaving rate of the soil;
s17, judging whether the frost heave amount of the soil base is smaller than the allowable frost heave height of the road surface, and outputting a judging result.
Preferably, the comprehensive thermal physical coefficient is calculated according to the thickness and the thermal physical coefficient of each layer, and the calculation formula is as follows:
Wherein h i is the thickness of each layer from top to bottom of the road surface, and a i is the thermal physical coefficient of the structural material of the corresponding layer.
Preferably, the maximum freezing depth of the road surface is calculated according to the comprehensive thermal physical coefficient, the preset road base humidity coefficient, the preset road base section form coefficient and the geodetic standard freezing depth, and the calculation formula is as follows:
Wherein Z max is the maximum freezing depth of the road surface, Z d is the standard freezing depth of the earth, a is the comprehensive thermal physical coefficient, b is the preset road base humidity coefficient, and c is the preset road base section form coefficient.
Preferably, the thickness of the road surface structural layer is calculated according to the thickness of each layer in the road surface structural layer, and the calculation formula is as follows:
Wherein H i is the thickness of each layer from top to bottom of the road surface structural layer, and H is the thickness of the road surface structural layer.
Preferably, the freezing depth of the soil base layer is calculated according to the maximum freezing depth of the road surface and the thickness of the road surface structural layer, and the calculation formula is as follows:
wherein h Soil is the freezing depth of the soil base layer.
Preferably, the frost heaving amount of the soil base is calculated according to the freezing depth of the soil base layer and the average frost heaving rate of the soil, and the calculation formula is as follows:
Wherein h is the frost heaving capacity of the soil base, eta is the average frost heaving rate of the soil, and the influence of the structural load of the road surface is not considered.
According to a second aspect of an embodiment of the present invention, there is provided an apparatus for determining the total thickness of a pavement structure based on frost heaving, comprising:
a master controller and a memory connected with the master controller;
the memory, in which program instructions are stored;
The master is configured to execute program instructions stored in the memory and perform the method of any of the above.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
It can be understood that the technical scheme can obtain the thickness and the thermal physical coefficient of each layer of the road surface, calculate the comprehensive thermal physical coefficient when the thickness of the soil base layer is the assumed freezing thickness, calculate the maximum freezing depth of the road surface, calculate the thickness of the road surface structure layer, calculate the freezing depth of the soil base layer, replace the assumed freezing thickness of the soil base layer with the freezing depth of the soil base layer if the freezing depth of the soil base layer is not equal to the assumed freezing thickness, repeatedly execute, calculate the frost heaving of the soil base according to the freezing depth of the soil base layer and the average frost heaving rate of soil, judge whether the frost heaving of the soil base is smaller than the allowable frost heaving of the road surface, and output a judging result. It can be understood that the technical scheme disclosed by the invention is suitable for quantitative determination of the structural layer thickness of the cement concrete pavement and the asphalt concrete pavement of airports and highways, and fills the gap of quantitative calculation and determination of the total structural layer thickness of the pavement.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram illustrating the steps of a method for determining the total thickness of a pavement structure based on frost heaving capacity, according to an exemplary embodiment;
fig. 2 is a schematic diagram of a road structure shown according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
In one embodiment, fig. 1 is a schematic diagram illustrating steps of a method for determining a total thickness of a pavement structure based on a frost heaving amount according to an exemplary embodiment, and referring to fig. 1, a method for determining a total thickness of a pavement structure based on a frost heaving amount is provided, including:
And S11, obtaining the thickness and the thermal physical coefficient of each layer in the pavement structure layer, obtaining the assumed frozen thickness and the thermal physical coefficient of the soil base layer, and calculating the comprehensive thermal physical coefficient according to the thickness and the thermal physical coefficient of each layer.
In specific practice, the road is divided into a pavement structure layer and a soil base layer, and the pavement structure layer is composed of a surface layer, a base layer and a cushion layer, see fig. 2. The thickness and thermal physical coefficients of each layer of the surface layer, the base layer and the cushion layer are obtained, the assumed freezing thickness of the soil base layer is obtained, the assumed value is used as an initial value, the thermal physical coefficient of the soil base layer is obtained, and the comprehensive thermal physical coefficient can be calculated according to the data.
The comprehensive thermal physical coefficient is calculated, and the calculation formula is as follows:
Wherein h i is the thickness of each layer from top to bottom of the road surface, and a i is the thermal physical coefficient of the structural material of the corresponding layer. In the above formula, when i is equal to 4, the soil base layer is the soil base layer, and the thickness of the soil base layer is the assumed freezing thickness.
The comprehensive thermal physical coefficient is a weighted average value of the thermal physical coefficients of the materials of each layer in the range of the depth of the ground freezing.
And step S12, calculating the maximum freezing depth of the road surface according to the comprehensive thermal physical coefficient, the preset road base humidity coefficient, the preset road base section form coefficient and the geodetic standard freezing depth.
The maximum freezing depth of the road surface is calculated by the following formula:
Wherein Z max is the maximum freezing depth of the road surface, Z d is the standard freezing depth of the earth, a is the comprehensive thermal physical coefficient, b is the preset road base humidity coefficient, and c is the preset road base section form coefficient.
It will be appreciated that by this calculation formula, the maximum freezing depth of the road surface can be calculated.
And S13, calculating the thickness of the pavement structure layer according to the thickness of each layer in the pavement structure layer.
The thickness of the road surface structural layer is calculated by the following formula:
wherein H i is the thickness of each layer of the pavement structure layer from top to bottom, the pavement structure layer is a surface layer, a base layer and a cushion layer respectively from top to bottom, and H is the thickness of the pavement structure layer. In addition, the number of layers of the pavement structure layer can be adjusted according to specific practical conditions.
And S14, calculating the freezing depth of the soil base layer according to the maximum freezing depth of the road surface and the thickness of the road surface structural layer.
The freezing depth of the soil base layer is calculated by the following formula:
wherein h Soil is the freezing depth of the soil base layer.
And step S15, judging whether the freezing depth of the soil base layer is equal to the assumed freezing thickness, if not, replacing the assumed freezing thickness of the soil base layer in the step S11 with the freezing depth of the soil base layer, repeatedly executing the steps S11 to S15, and if so, executing the step S16.
For example, the initial assumed freezing thickness is 0.15 m, the calculated freezing depth of the soil base layer is 0.1 m, the assumed freezing thickness is replaced by 0.1 m, and then steps S11 to S15 are re-executed until the final obtained freezing depth of the soil base layer is equal to the assumed freezing thickness, for example, if the assumed freezing thickness is 0.15 m, the calculated freezing depth of the soil base layer is 0.15 m, the repeated calculation is stopped, and the process goes to step S16.
And S16, calculating the frost heaving capacity of the soil base according to the freezing depth of the soil base and the average frost heaving rate of the soil.
The frost heaving capacity of the soil base is calculated by the following calculation formula:
Where h is the frost heaving capacity of the soil base and η is the average frost heaving rate of the soil.
And S17, judging whether the frost heaving capacity of the soil base is smaller than the allowable frost heaving height of the road surface, and outputting a judging result.
The pavement specified for the specification allows for frost heaving.
Taking a concrete practical example, the pavement structure layer is assumed to be four layers, namely a cement surface layer, a cement crushed stone layer, a cement stabilized soil layer and a graded crushed stone layer, wherein the thickness of the cement surface layer is 0.22m, the thermal physical coefficient is 1.4, the thickness of the cement crushed stone layer is 0.25m, the thermal physical coefficient is 1.4, the thickness of the cement stabilized soil layer is 0.38m, the thermal physical coefficient is 1.35, the thickness of the graded crushed stone layer is 0.15m, and the thermal physical coefficient is 1.45.
The assumed freezing depth of the soil base layer under the pavement structure layer is 0.15m, and the thermal physical coefficient is 1.05.
From the above data, the overall thermal coefficient of physical properties a can be calculated:
calculating the maximum freezing depth Z max of the road surface:
calculating the thickness H of the pavement structural layer:
calculating the freezing depth of the soil base layer under the pavement structure layer:
It can be seen that the calculated freezing depth of the soil base layer coincides with the assumed value. And then executing steps S16 to S17, and judging whether the frost heaving capacity of the soil base is smaller than the allowable frost heaving height of the road surface.
It can be understood that the technical scheme shown in the embodiment can obtain the thickness and the thermal physical coefficient of each layer of the road surface, calculate the comprehensive thermal physical coefficient when the thickness of the soil base layer is the assumed freezing thickness, further calculate the maximum freezing depth of the road surface, calculate the thickness of the road surface structure layer, calculate the freezing depth of the soil base layer, replace the assumed freezing thickness of the soil base layer with the freezing depth of the soil base layer if the freezing depth of the soil base layer is not equal to the assumed freezing thickness, repeatedly execute, calculate the frost heaving of the soil base according to the freezing depth of the soil base layer and the average frost heaving rate of the soil, judge whether the frost heaving of the soil base is smaller than the allowable frost heaving of the road surface, and output the judging result. It can be understood that the technical scheme shown in the embodiment is suitable for quantitative determination of the thickness of the pavement structure layers of the airport, highway cement concrete pavement and asphalt concrete pavement, and supplements the gap of quantitative calculation and determination of the total pavement structure layer thickness.
According to a second aspect of an embodiment of the present invention, there is provided an apparatus for determining the total thickness of a pavement structure based on frost heaving, comprising:
a master controller and a memory connected with the master controller;
the memory, in which program instructions are stored;
The master is configured to execute program instructions stored in the memory and perform the method of any of the above.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "plurality" means at least two.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of techniques known in the art, discrete logic circuits with logic gates for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007023653A (en) * | 2005-07-19 | 2007-02-01 | Dow Kakoh Kk | Freezing preventive structure |
| CN108333323A (en) * | 2017-12-07 | 2018-07-27 | 中国矿业大学 | A kind of body frost heaving rate measuring device and measurement method |
| CN117272706A (en) * | 2022-06-13 | 2023-12-22 | 中国石油化工股份有限公司 | Method and device for acquiring frost heaving capacity in frozen soil area, electronic equipment and storage medium |
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- 2024-12-03 CN CN202411754998.4A patent/CN119230035A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007023653A (en) * | 2005-07-19 | 2007-02-01 | Dow Kakoh Kk | Freezing preventive structure |
| CN108333323A (en) * | 2017-12-07 | 2018-07-27 | 中国矿业大学 | A kind of body frost heaving rate measuring device and measurement method |
| CN117272706A (en) * | 2022-06-13 | 2023-12-22 | 中国石油化工股份有限公司 | Method and device for acquiring frost heaving capacity in frozen soil area, electronic equipment and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 中国民用航空局: "民用机场沥青道面设计规范", 《中华人民共和国行业标准》, 1 January 2018 (2018-01-01), pages 6 * |
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