Real-time monitoring method for moisture content in soil compaction process

Abstract

The invention relates to a real-time monitoring method for the moisture content in the soil material compaction process. The method comprises the following steps: S1, developing a real-time monitoring device for the moisture content in the soil material compaction process integrated with near-infrared monitoring; s2, modeling the relationship between the soil surface water content and the overall water content; and S3, monitoring the moisture content in real time in the soil compaction process. The defect that a near-infrared monitoring device can only monitor the moisture content of the surface layer is overcome, calculation of the overall moisture content of the soil material is achieved, and a new effective way is provided for real-time monitoring of the moisture content in the soil material compaction process.

Description

Technical Field

[0001] This invention belongs to the field of compaction quality control technology in earth-rock dam construction, specifically relating to a method for real-time monitoring of moisture content during soil compaction. Background Technology

[0002] In the construction of earth-rock dams, the quality of soil compaction is a key factor in effectively controlling post-construction settlement. Soil property parameters (such as gradation and moisture content) and compaction process parameters (such as the number of compaction passes, travel speed, and vibration state) jointly determine the compaction effect. Among these, soil moisture content is a crucial factor in ensuring compaction quality. While methods such as drying or alcohol combustion are commonly used for limited sampling checks, the actual moisture content of soil varies greatly—it differs at different times, from different sources, and in different work areas—making real-time monitoring impossible.

[0003] In recent years, indirect methods for measuring moisture content, such as ground-penetrating radar, capacitance sensors, resistivity methods, near-infrared spectroscopy, and nuclear magnetic resonance, have been widely used in agriculture, food, textiles, and chemical industries. However, real-time monitoring of soil moisture content during construction is rarely studied. How to achieve real-time monitoring of moisture content during soil compaction is a problem that needs to be solved.

[0004] Therefore, this invention proposes a method for real-time monitoring of moisture content during soil compaction. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for real-time monitoring of soil moisture content during the compaction process. This method enables real-time monitoring of soil moisture content during compaction, overcomes the limitation of near-infrared monitoring devices that can only monitor surface moisture content, and realizes the calculation of the overall soil moisture content. This provides a new and effective approach for real-time monitoring of soil moisture content during the compaction process.

[0006] The technical problem solved by this invention is achieved through the following technical solution: A method for real-time monitoring of moisture content during soil compaction, wherein the method is based on the development of a real-time monitoring device for moisture content during soil compaction that integrates near-infrared monitoring, and establishes a relationship model between the monitored surface moisture content and the overall moisture content of the soil to calculate the overall moisture content of the soil. The steps of the method are as follows: S1. Development of a real-time monitoring device for soil compaction moisture content integrating near-infrared monitoring. The device includes a GNSS positioning and navigation module, a vehicle-mounted intelligent terminal, a data transmission unit, a roller power module, a real-time moisture content monitoring unit, and a mobile power module. The GNSS positioning and navigation module performs centimeter-level positioning of the roller. The vehicle-mounted intelligent terminal displays the current construction unit, real-time coordinates, construction speed, number of compaction passes, moisture content, and ICMV information in real time. The data transmission unit sends data to a remote database for subsequent generation of overall moisture content, thereby evaluating compaction quality. The roller power module provides power to the vehicle-mounted intelligent terminal. The real-time moisture content monitoring unit monitors and displays moisture content data in real time and uploads the data to the vehicle-mounted intelligent terminal via an RS485 interface. The mobile power module provides power to the real-time monitoring device for soil compaction moisture content. S2. Modeling the relationship between surface moisture content and overall moisture content of soil. (1) The real-time moisture content monitoring unit was calibrated and several soil samples with different moisture contents were prepared. The moisture content was measured using the real-time moisture content monitoring unit and the indoor drying method, and multiple sets of sample data of measured and actual moisture content were obtained. Thus, a relationship model between the actual and monitored surface moisture content was constructed, as shown in the following formula (1): ; (1) in: This is the measured moisture content. , It is a constant. This is the moisture content monitoring value. This is random error; (2) Assuming that the on-site environmental factors will not change significantly during the construction process, the ambient temperature will be... Light intensity Wind speed All values ​​were taken as constants. By varying the initial moisture content, the moisture content distribution of multiple samples along the height direction was obtained. The relationship between the measured surface moisture content and the overall moisture content of the samples was further constructed as follows: ; (2) in: For overall moisture content, , It is a constant. This is random error; (3) Substituting formula (1) into (2), the relationship between the surface moisture content monitoring value and the overall moisture content of the soil is obtained as follows: ; (3) The overall moisture content of the soil at the monitoring location is calculated using formula (3).

[0007] S3. Real-time monitoring of soil moisture content during compaction: Based on the soil moisture content collected at certain intervals during the compaction process according to formula (3), the Kriging spatial interpolation method is used to obtain the overall moisture content distribution cloud map of the entire working face, providing moisture content information for soil compaction quality assessment.

[0008] The advantages and beneficial effects of this invention are as follows: 1. This invention enables real-time monitoring of soil moisture content during compaction, solving the problem of varying actual soil moisture content, i.e., different moisture content at different times, from different material sources, and in different work areas; it enables the calculation of overall moisture content, overcoming the limitation of near-infrared monitoring devices that can only monitor surface moisture content; and it provides a new approach for accurate assessment of compaction quality across the entire area. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the real-time monitoring device for moisture content of soil compaction process integrating near-infrared monitoring according to the present invention; Figure 2 This is a flowchart of the present invention.

[0010] Figure 3 It is a cloud map for overall moisture content assessment across the entire region. Detailed Implementation

[0011] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0012] This invention proposes a method for real-time monitoring of moisture content during soil compaction. Its innovation lies in that, based on the development of a real-time monitoring device for moisture content during soil compaction that integrates near-infrared monitoring, the method establishes a relationship model between the surface moisture content monitoring value and the overall moisture content of the soil to realize the calculation of the overall moisture content of the soil. like Figure 2 As shown, the steps of the method are as follows: S1. Development of a real-time monitoring device for soil moisture content during compaction integrating near-infrared monitoring, such as... Figure 1As shown, the real-time moisture content monitoring device for soil compaction includes a GNSS positioning and navigation module, a vehicle-mounted intelligent terminal, a data transmission unit, a roller power module, a real-time moisture content monitoring unit, and a mobile power module. The GNSS positioning and navigation module completes centimeter-level positioning of the roller. The vehicle-mounted intelligent terminal displays the current construction unit, real-time coordinate information, construction speed, number of compaction passes, moisture content, and ICMV information in real time. The data transmission unit sends data to a remote database for subsequent generation of overall moisture content, thereby evaluating compaction quality. The roller power module provides the power required by the vehicle-mounted intelligent terminal. The real-time moisture content monitoring unit monitors and displays moisture content data in real time and uploads the moisture content data to the vehicle-mounted intelligent terminal in real time via an RS485 interface. The mobile power module provides the power required by the real-time moisture content monitoring device for soil compaction. S2. Modeling the relationship between surface moisture content and overall moisture content of soil. (1) The real-time moisture content monitoring unit was calibrated and several soil samples with different moisture contents were prepared. The moisture content was measured using the real-time moisture content monitoring unit and the indoor drying method, and multiple sets of sample data of measured and actual moisture content were obtained. Thus, a relationship model between the actual and monitored surface moisture content was constructed, as shown in the following formula (1): ; (1) in: This is the measured moisture content. , It is a constant. This is the moisture content monitoring value. This is random error; (2) Assuming that the on-site environmental factors will not change significantly during the construction process, the ambient temperature will be... Light intensity Temperature All values ​​were taken as constants. By varying the initial moisture content, the moisture content distribution of multiple samples along the height direction was obtained. The relationship between the measured surface moisture content and the overall moisture content of the samples was further constructed as follows: ; (2) in: For overall moisture content, , It is a constant. This is random error; (3) Substituting formula (1) into (2), the relationship between the surface moisture content monitoring value and the overall moisture content of the soil is obtained as follows: ; (3) The overall moisture content of the soil at the monitoring location is calculated using formula (3).

[0013] S3. Real-time monitoring of moisture content during soil compaction process (1) By using a real-time moisture content monitoring device and an indoor drying method, the moisture content of the soil is monitored and calibrated, and a relationship model between the monitored and measured moisture content values ​​is constructed as shown in formula (1). (2) By numerical simulation of soil thermal and moisture coupling migration, a relationship model between the surface moisture content monitoring value and the overall moisture content of soil is established, as shown in formula (3). (3) During the compaction process, a real-time monitoring device for soil moisture content during compaction is used to collect the surface moisture content of the soil at the location of the compactor in real time. Using formula (3), the overall moisture content of the soil at all collection locations can be calculated. (4) Overall assessment of soil moisture content. Based on the soil moisture content collected at certain intervals (generally every 1 second sampling frequency, considering a vehicle speed of 3-4 km / h, so the distance between each sampling point is about 1m) during the compaction process obtained in step (3), the Kriging spatial interpolation method can be used to obtain the overall moisture content distribution cloud map of the entire working face, which can provide moisture content information for soil compaction quality assessment, and thus better assess the overall compaction quality.

[0014] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A method for real-time monitoring of moisture content during soil compaction, characterized in that: The method is based on the development of a real-time monitoring device for soil compaction process integrating near-infrared monitoring. It establishes a relationship model between the surface moisture content monitoring value and the overall moisture content of the soil to realize the calculation of the overall moisture content of the soil. The steps of the method are as follows: S1. Development of a real-time monitoring device for soil compaction moisture content integrating near-infrared monitoring. The device includes a GNSS positioning and navigation module, a vehicle-mounted intelligent terminal, a data transmission unit, a roller power module, a real-time moisture content monitoring unit, and a mobile power module. The GNSS positioning and navigation module performs centimeter-level positioning of the roller. The vehicle-mounted intelligent terminal displays the current construction unit, real-time coordinates, construction speed, number of compaction passes, moisture content, and ICMV information in real time. The data transmission unit sends data to a remote database for subsequent generation of overall moisture content, thereby evaluating compaction quality. The roller power module provides power to the vehicle-mounted intelligent terminal. The real-time moisture content monitoring unit monitors and displays moisture content data in real time and uploads the data to the vehicle-mounted intelligent terminal via an RS485 interface. The mobile power module provides power to the real-time monitoring device for soil compaction moisture content. S2. Modeling the relationship between surface moisture content and overall moisture content of soil. (1) The real-time moisture content monitoring unit was calibrated and several soil samples with different moisture contents were prepared. The moisture content was measured using the real-time moisture content monitoring unit and the indoor drying method, and multiple sets of sample data of measured and actual moisture content were obtained. Thus, a relationship model between the actual and monitored surface moisture content was constructed, as shown in the following formula (1): ； （1） in: This is the measured moisture content. , It is a constant. This is the moisture content monitoring value. This is random error; (2) Assuming that the on-site environmental factors will not change significantly during the construction process, the ambient temperature will be... Light intensity Wind speed All values ​​were taken as constants. By varying the initial moisture content, the moisture content distribution of multiple samples along the height direction was obtained. The relationship between the measured surface moisture content and the overall moisture content of the samples was further constructed as follows: ； （2） in: For overall moisture content, , It is a constant. This is random error; (3) Substituting formula (1) into (2), the relationship between the surface moisture content monitoring value and the overall moisture content of the soil is obtained as follows: ； （3） The overall moisture content of the soil at the monitoring location is calculated using equation (3); S3. Real-time monitoring of soil moisture content during compaction: Based on the soil moisture content collected at certain intervals during the compaction process according to formula (3), the Kriging spatial interpolation method is used to obtain the overall moisture content distribution cloud map of the entire working face, providing moisture content information for soil compaction quality assessment.

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