Evaluation method for non-uniformity of settlement of image processing roadbedTechnical Field
The invention relates to the technical field of information models, in particular to application of an image processing technology in road engineering. The invention provides an evaluation method for non-uniformity of settlement of an image processing roadbed.
Background
Uneven settlement of the roadbed is one of the main causes of deformation and damage of the road surface. Uneven settlement of the roadbed not only can cause damage of the roadbed, but also can generate additional stress in the pavement structure due to unevenness of the top surface of the roadbed, and the additional stress can cause uncomfortable driving or serious damage of the pavement structure due to combined action of the additional stress and a vehicle-mounted vehicle. Therefore, reasonable evaluation of the differential settlement of the roadbed is important to guaranteeing the operation safety of the road and guiding the maintenance of the line.
The conventional roadbed settlement evaluation is mostly based on a single settlement amplitude index, and lacks comprehensive consideration of vehicles, environments and wavelengths. For uneven settlement of roadbed, no uniform evaluation standard and method are developed in the industry at present, so that a method capable of rapidly and accurately evaluating the uneven settlement of roadbed is urgently needed.
Disclosure of Invention
In order to solve the problem of how to evaluate the settlement nonuniformity of the roadbed, the invention provides an image processing roadbed settlement nonuniformity evaluation method.
In order to achieve the above object, the present invention provides the following solutions:
An evaluation method for non-uniformity of settlement of an image processing roadbed comprises the following steps:
Step one, slotting at a roadbed settlement position, and collecting a settlement position image;
step two, preprocessing the acquired image;
Calculating the temperature of the subgrade settlement position through the color ratio of the preprocessed image;
Step four, calculating a temperature coefficient in evaluation of the non-uniformity of subgrade settlement;
And fifthly, calculating the settlement of the roadbed and dividing the non-uniformity.
The invention further discloses the following technology:
Preferably, the image preprocessing mode in the second step is as follows:
Replacing a pixel value in an image with a median value of each pixel value in the neighborhood of the pixel value after sequencing, wherein the image data points are as followsThe partial data is arranged from small to large asThen:
；
Wherein: -pixel values at points in the image.
Preferably, in the third step, the calculation formula for calculating the current temperature of the roadbed by using the color ratio is as follows:
；
Wherein: -the current temperature of the subgrade;
-G-channel values of the preprocessed image in step two;
-step two, preprocessing the imageChannel number.
Preferably, in the fourth step, the temperature coefficient is calculated according to the following formula:
；
Wherein: -a temperature coefficient;
-temperature factor, taking 0.03;
-the current temperature of the subgrade;
the temperature most favorable for biodegradation was taken at 42 ℃.
Preferably, the roadbed settlement amount in the fifth step is calculated according to the following formula:
；
Wherein: -a maximum first order degradation rate constant;
-a temperature coefficient;
-pH coefficient;
-a water cut factor;
-roadbed settlement;
-initial height of the landfill;
-modifying the main compression index;
-initial vertical stress;
-vertical stress delta;
-total compressive strain resulting from biodegradation;
-mechanical creep coefficient;
-a mechanical creep rate constant;
-applying stress deltaFor a later duration.
Preferably, calculating the numerical standard deviation of roadbed settlement according to the roadbed settlement amount in the fifth step, and if the standard deviation is more than or equal to 0.03, the roadbed settlement is uneven; if the average particle size is less than 0.03, the uniformity is improved.
The beneficial effects of the invention are as follows:
According to the method for evaluating the settlement nonuniformity of the image processing roadbed, provided by the invention, the images of the settlement positions of different sections of the road section to be evaluated are collected, the collected images are preprocessed, the noise of the images can be effectively removed by median filtering, the quality of the collected images is improved, and the subsequent color ratio processing and extraction are convenient. The current temperature of the roadbed is calculated through the color ratio of the preprocessed image, so that the influence of wind flow on the traditional temperature measurement mode is eliminated, the temperature of the settlement position of the roadbed is more accurately determined, the temperature coefficient and the settlement amount are calculated, and whether the settlement of the roadbed is uneven or not can be judged. The method has the advantages of convenience, rapidness and accuracy.
Detailed Description
The present invention will be described in further detail with reference to the following examples, so that the technical means, the creation characteristics, the achievement of the purpose and the effect achieved by the present invention can be easily understood. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples: after a certain expressway project is in traffic for many years, each section of roadbed is settled, and the method is used for evaluating the non-uniformity of the roadbed.
Step one, slotting at a roadbed settlement position, and collecting a settlement position image.
And step two, preprocessing the acquired image.
Replacing a pixel value in an image with a median value of each pixel value in the neighborhood of the pixel value after sequencing, wherein the image data points are as followsThe partial data is arranged from small to large asThen:
；
Wherein: -pixel values at points in the image.
And thirdly, calculating the current temperature of the roadbed through the color ratio of the preprocessed image.
Collecting G channel values and G channel values of 5 section images processed in the second step by a computerChannel number.
The calculation formula for calculating the current temperature of the roadbed by the color ratio is as follows:
；
Wherein: -the current temperature of the subgrade, c;
-G-channel values of the preprocessed image in step two;
-step two, preprocessing the imageChannel number.
The calculation results are shown in the following table.
And step four, calculating a temperature coefficient in evaluation of the non-uniformity of the subgrade settlement.
The temperature coefficient is calculated according to the following formula:
；
Wherein: -a temperature coefficient;
-temperature factor, taking 0.03;
-the current temperature of the subgrade;
the temperature most favorable for biodegradation was taken at 42 ℃.
The calculation results are shown in the following table.
And fifthly, calculating the settlement of the roadbed and dividing the non-uniformity.
The subgrade settlement is calculated according to the following formula:
；
Wherein: -a maximum first order degradation rate constant, day-1;
-a temperature coefficient;
-pH coefficient;
-a water cut factor;
-subgrade settlement, m;
-initial height of buried layer, m;
-modifying the main compression index;
-initial vertical stress, kPa;
vertical stress delta, kPa;
-total compressive strain resulting from biodegradation;
-mechanical creep coefficient, kPa-1;
-mechanical creep rate constant, day-1;
-applying stress deltaThe last time, s.
The calculation results are shown in the following table.
The standard deviation of 5 section settlement S is calculated to be 0.045 and larger than 0.03, so that the evaluation result of the differential settlement of the roadbed belongs to non-uniformity.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.