Roadbed and pavement rolling stiffness continuous detection method and roadbed and pavement rolling control method

Abstract

The invention provides a roadbed and pavement rolling rigidity continuous detection method and a roadbed and pavement rolling control method, and relates to the technical field of roadbed and pavement filling and rolling, the method comprises the following steps: filtering the vertical vibration acceleration of an upper rack and the vertical vibration acceleration of a vibration wheel, and obtaining the vibration displacement of the vibration wheel based on frequency domain integration; based on the eccentric block rotation signal, in a vibration period, obtaining a vertical component force of the exciting force corresponding to the moment t; based on the vertical component force of the exciting force, the mass of the vibrating wheel, the mass of the upper rack, the vertical vibration acceleration of the upper rack and the vertical vibration acceleration of the vibrating wheel, the wheel-soil interaction force of the road roller is obtained; the roadbed and pavement rolling stiffness is obtained based on the wheel-soil interaction force of the road roller and the vibration displacement of the vibration wheel, the roadbed and pavement compaction quality in rolling engineering can be detected and monitored in real time, the roadbed and pavement compaction quality is guaranteed, and the roadbed and pavement rolling stiffness detection method has important significance in improving the roadbed and pavement compaction efficiency.

Description

Technical Field

[0001] This invention relates to the field of roadbed and pavement filling and compaction technology, and in particular to a method for continuous detection of roadbed and pavement compaction stiffness and a method for roadbed and pavement compaction control. Background Technology

[0002] The roadbed and pavement are constructed using a layered compaction method, and the compaction quality is crucial to project safety. Traditional testing methods cannot comprehensively and in real-time monitor compaction quality and require significant manpower, resources, and time. During compaction, the density and stiffness of the fill material gradually increase. The stiffness of the fill material can be calculated through the interaction between the vibratory roller and the roadbed / pavement, enabling continuous monitoring and control of the roadbed / pavement compaction quality. This also provides a basis for optimizing the roadbed / pavement compaction process, effectively ensuring compaction quality and improving compaction efficiency.

[0003] The authorized patent, "Method for Testing the Compaction Quality of Rockfill Dam Material Based on Soil Stiffness" (Authorization Announcement No.: CN112924310B), proposes a three-degree-of-freedom dynamic analysis model for a "roller-soil" vibration system. Assuming that soil damping remains constant, it derives the relationship between soil stiffness and the acceleration of the vibration system, and inversely calculates the soil stiffness through field-measured acceleration. The drawback of this method is that acceleration is affected by both soil stiffness and damping; this method does not consider the influence of damping, and the calculated stiffness is not the actual stiffness.

[0004] By analyzing the force on the vibratory roller, the interaction force between the vibratory roller and the roadbed can be obtained, thus yielding the force-displacement curve of the soil. The document "Influence of Compaction Parameters on the Vibratory Roller-Soil Dynamic System" discloses a method for measuring soil stiffness, but this method has two shortcomings: First, it requires the installation of a specific magnetic particle velocity ring on the rotating shaft inside the vibratory motor, followed by the use of a Hall sensor to detect the position of the eccentric block. This method is only applicable to vibratory motors with specific structures and specific models of vibratory rollers. Most vibratory rollers currently used on construction sites cannot use this method, significantly limiting its application. Second, the soil stiffness measurement index ks in the document only considers the stiffness value of the soil during the loading process below the vibration equilibrium position, without considering the soil stiffness value during the entire loading process. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a method for continuous detection of subgrade and pavement compaction stiffness and subgrade and pavement compaction control, enabling real-time detection and monitoring of the compacted material quality of the subgrade and pavement during compaction projects. Specifically, it includes:

[0006] A method for continuous testing of roadbed and pavement compaction stiffness includes:

[0007] S1. Build a continuous detection system for roadbed and pavement compaction stiffness. Based on the continuous detection device for roadbed and pavement compaction stiffness, collect the vertical vibration acceleration of the upper frame, the vertical vibration acceleration signal of the vibrating wheel, and the rotation signal of the eccentric block.

[0008] S2. Filter the vertical vibration acceleration of the upper frame and the vertical vibration acceleration of the vibrating wheel, and obtain the vibration displacement of the vibrating wheel based on frequency domain integration;

[0009] S3. Based on the eccentric block rotation signal, the vertical component of the excitation force F at time t is obtained within one vibration cycle. v (t);

[0010] S4, based on the vertical component of the excitation force F v (t) The mass of the vibratory wheel, the mass of the upper frame, the vertical vibration acceleration of the upper frame, and the vertical vibration acceleration of the vibratory wheel are used to obtain the wheel-soil interaction force F of the road roller. s (t);

[0011] S5, Wheel-soil interaction force F based on road roller s (t) and the vibration displacement of the vibrating wheel are used to obtain the compaction stiffness of the roadbed and pavement.

[0012] Optionally, the continuous detection system for the compaction stiffness of the roadbed and pavement in S1 includes:

[0013] The acceleration signal acquisition device collects the vertical vibration acceleration of the upper frame and the vertical vibration acceleration of the vibrating wheel in real time and sends the vertical vibration acceleration of the upper frame and the vertical vibration acceleration of the vibrating wheel to the data processing device.

[0014] The eccentric block rotation detection device acquires the eccentric block rotation signal of the road roller and sends the eccentric block rotation signal to the data processing device;

[0015] The satellite positioning device acquires the three-dimensional spatial information of the road roller and transmits the three-dimensional spatial information to the data processing device;

[0016] The data processing device analyzes the received vertical vibration acceleration of the upper frame, vertical vibration acceleration of the vibrating wheel, eccentric block rotation signal, and three-dimensional spatial information of the roller to obtain the compaction stiffness of the roadbed and pavement.

[0017] The display device is connected to the data processing device and is used to display the data analysis process and results of the data processing device.

[0018] Optionally, the acceleration signal acquisition device includes: a first acceleration sensor and a second acceleration sensor;

[0019] The first acceleration sensor is mounted on the vibrating wheel;

[0020] The second acceleration sensor is mounted on the upper frame.

[0021] Optionally, the eccentric block rotation detection device includes: an inductive sensor and a mounting bracket;

[0022] One end of the mounting bracket is vertically mounted on the upper frame, and the other end of the mounting bracket is used to mount an inductive sensor;

[0023] When the eccentric block is stationary, the inductive sensor faces the side surface of the bottom end of the eccentric block.

[0024] Optionally, based on the eccentric block rotation signal, S3 obtains the vertical component of the excitation force F at time t within one vibration cycle. v (t) includes:

[0025] The vertical component of the excitation force F v The formula for (t) is formula (1):

[0026] (1)

[0027] in, For the mass of the eccentric block, For the eccentricity, F is the vibration frequency of the road roller. v (t) represents the time period. to Vertical component of the excitation force over a given time period;

[0028] Where t1 is the start time of the first change in voltage or current, t2 is the end time of the first change in voltage or current, t3 is the start time of the next change in voltage or current, and t4 is the end time of the next change in voltage or current.

[0029] Optionally, the vertical component F of the excitation force in S4 v (t) The mass of the vibratory wheel, the mass of the upper frame, the vertical vibration acceleration of the upper frame, and the vertical vibration acceleration of the vibratory wheel are used to obtain the wheel-soil interaction force F of the road roller. s (t) includes:

[0030] The wheel-soil interaction force F of the road roller s The formula for (t) is formula (2):

[0031] (2)

[0032] in, The mass of the vibrating wheel; For the quality of the upper rack; It is the acceleration due to gravity; This refers to the vertical vibration acceleration of the vibrating wheel; This refers to the vertical vibration acceleration of the upper frame.

[0033] Optionally, the wheel-soil interaction force F based on the roller in S5 s (t) and the vibration displacement of the vibratory wheel are used to obtain the compaction stiffness of the roadbed and pavement, including:

[0034] When the vibratory roller is in continuous contact with the subgrade and pavement, the compaction stiffness k of the subgrade and pavement is... r The calculation formula is formula (3):

[0035] (3)

[0036] in, This represents the maximum vibration displacement. This represents the minimum vibration displacement.

[0037] This represents the interaction force between the roller and the roadbed / pavement corresponding to the maximum vibration displacement.

[0038] This represents the interaction force between the roller and the subgrade / pavement corresponding to the minimum vibration displacement.

[0039] When the vibratory wheel is in a jumping vibration state, the compaction stiffness k of the subgrade and pavement r The calculation formula is formula (4):

[0040] (4)

[0041] in, This represents the maximum vibration displacement. This represents the minimum vibration displacement. This represents the interaction force between the roller and the subgrade / pavement corresponding to the maximum vibration displacement.

[0042] A method for controlling roadbed and pavement compaction, comprising the aforementioned method for continuous detection of roadbed and pavement compaction stiffness, and further comprising:

[0043] The location information parameters of the road roller are obtained by constantly acquiring the location information of the road roller using a satellite positioning device.

[0044] The subgrade and pavement compaction stiffness parameters are obtained by calculating the subgrade and pavement compaction stiffness corresponding to the current location information based on the continuous detection method of subgrade and pavement compaction stiffness.

[0045] Based on location information parameters and subgrade and pavement compaction stiffness parameters, a correspondence between location information and subgrade and pavement compaction stiffness is constructed.

[0046] Based on the correspondence between location information and roadbed and pavement compaction stiffness, the road roller is driven to compact sections that have not yet met the compaction quality standards.

[0047] Optionally, the step of driving the road roller to the section where the compaction quality has not met the standard, based on the correspondence between location information and the compaction stiffness of the roadbed and pavement, includes:

[0048] Set the threshold value for roadbed and pavement compaction stiffness as k. ra ;

[0049] Based on the correspondence between location information and subgrade and pavement compaction stiffness, subgrade and pavement compaction stiffness < k was selected. ra The corresponding road sections were identified as substandard.

[0050] Drive the road roller to compact the substandard road sections until the corresponding subgrade compaction stiffness is ≥k. ra .

[0051] Optionally, the display module in the continuous detection system for roadbed and pavement compaction stiffness supports displaying the roadbed and pavement compaction stiffness of the road section traversed by the road roller.

[0052] The above technical solution has at least the following advantages compared with the existing technology:

[0053] This invention can acquire the vertical vibration acceleration signal and eccentric block rotation signal of a vibratory roller at a target time, and determine the working state of the vibratory roller at the target time based on the vertical vibration acceleration signal and the rotation signal. The working state of the vibratory roller includes the vibration frequency of the vibratory roller and the wheel-soil interaction force. This enables monitoring of the working state of the vibratory roller, which is of great significance for ensuring the compaction quality and improving the compaction efficiency of the vibratory roller.

[0054] This invention enables continuous detection of the stiffness of roadbed and pavement during the entire rolling process. It features high accuracy of detection indicators, convenient and detachable device installation, and is applicable to various types of fillers for roadbeds and pavements as well as various models of vibratory rollers. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 A flowchart of one embodiment of the present invention;

[0057] Figure 2 A schematic diagram of the system principle of one embodiment of the present invention;

[0058] Figure 3 The compaction stiffness k of the subgrade and pavement under continuous contact state, as provided in one embodiment of the present invention. r Calculation method diagram;

[0059] Figure 4 The roadbed and pavement compaction stiffness k under vibration state, as provided in one embodiment of the present invention r Calculation method diagram;

[0060] Figure 5 This is a schematic diagram of an eccentric block rotating device according to one embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the output signal of an eccentric block selection device according to one embodiment of the present invention;

[0062] Figure 7 The roadbed compaction stiffness k is one embodiment of the present invention. r Changes with the number of compaction passes;

[0063] Figure 8 The compaction stiffness k is one embodiment of the present invention. r The correlation between compaction degree K and the degree of compaction. Figure Labels

[0064] 21. Acceleration signal acquisition device; 22. Data processing device; 23. Eccentric block rotation detection device; 24. Satellite positioning device; 25. Display device;

[0065] 201. Vibrating wheel; 202. Upper frame; 203. Eccentric block; 211. Mounting bracket; 212. Inductive sensor. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0067] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or “connected,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0068] Since existing technologies do not consider the soil stiffness value during the entire loading process, this invention can measure the compaction stiffness of the subgrade and pavement under different conditions (continuous contact and jump conditions). The specific scheme is as follows:

[0069] like Figures 1-6 As shown, a method for continuous testing of roadbed and pavement compaction stiffness includes:

[0070] S1. Build a continuous detection system for roadbed and pavement compaction stiffness. Based on the continuous detection device for roadbed and pavement compaction stiffness, collect the vertical vibration acceleration of the upper frame 202, the vertical vibration acceleration signal of the vibrating wheel 201 and the rotation signal of the eccentric block 203.

[0071] S2. Filter the vertical vibration acceleration of the upper frame 202 and the vertical vibration acceleration of the vibrating wheel 201, and obtain the vibration displacement of the vibrating wheel 201 based on frequency domain integration.

[0072] S3. Based on the rotation signal of eccentric block 203, the vertical component of the excitation force F at time t is obtained within one vibration cycle. v (t);

[0073] S4, based on the vertical component of the excitation force F v (t) The mass of the vibrating wheel 201, the mass of the upper frame 202, the vertical vibration acceleration of the upper frame 202, and the vertical vibration acceleration of the vibrating wheel 201 are used to obtain the wheel-soil interaction force F of the road roller. s (t);

[0074] S5, Wheel-soil interaction force F based on road roller s The compaction stiffness of the roadbed and pavement is obtained by taking the vibration displacement of the vibrating wheel 201 and the vibration displacement of the vibrating wheel 201.

[0075] One specific implementation method, such as Figure 2 and Figure 5As shown, the continuous detection system for the compaction stiffness of the roadbed and pavement in S1 includes: an acceleration signal acquisition device 21, an eccentric block rotation detection device 23, a satellite positioning device 24, a data processing device 22, and a display device 25.

[0076] Acceleration signal acquisition device 21 acquires the vertical vibration acceleration of the upper frame 202 and the vertical vibration acceleration of the vibrating wheel 201 in real time and sends the vertical vibration acceleration of the upper frame 202 and the vertical vibration acceleration of the vibrating wheel 201 to data processing device 22; eccentric block rotation detection device 23 acquires the rotation signal of the eccentric block 203 of the roller and sends the rotation signal of the eccentric block 203 to data processing device 22; satellite positioning device 24 acquires the three-dimensional spatial information of the roller and transmits the three-dimensional spatial information to data processing device 22; data processing device 22 performs data analysis based on the received vertical vibration acceleration of the upper frame 202, vertical vibration acceleration of the vibrating wheel 201, rotation signal of the eccentric block 203, and three-dimensional spatial information of the roller to obtain the roadbed and pavement compaction stiffness; display device 25 is connected to data processing device 22 and is used to display the data analysis process and analysis results of data processing device 22.

[0077] In one specific embodiment, the acceleration signal acquisition device 21 includes: a first acceleration sensor and a second acceleration sensor; the first acceleration sensor is mounted on the vibrating wheel 201; the second acceleration sensor is mounted on the upper frame 202. The eccentric block rotation detection device 23 includes: an inductive sensor 212 and a mounting bracket 211; one end of the mounting bracket 211 is vertically mounted on the upper frame 202, and the other end of the mounting bracket 211 is used to mount the inductive sensor 212; when the eccentric block 203 is stationary, the inductive sensor 212 faces the side surface of the bottom end of the eccentric block 203.

[0078] This system mainly consists of an acceleration acquisition device, an eccentric block rotation detection device 23, a satellite positioning device 24, a data processing device 22, and a display device 25. The acceleration acquisition device includes a first acceleration sensor mounted on the vibratory roller wheel 201 and a second acceleration sensor mounted on the vibratory roller frame. It collects real-time vertical vibration acceleration signals from the vibratory roller wheel 201 and the upper frame 202 of the vibratory roller, and inputs these signals to the data processing device 22. The eccentric block rotation detection device 23 consists of an inductive sensor 212 and a mounting bracket 211. The mounting bracket 211 is vertically installed, with one end fixed to the inside of the upper frame 202 and the other free end extending to the stationary position area of ​​the eccentric block 203 of the vibratory roller wheel 201. The inductive sensor 212 is mounted on the free end of the bracket, facing the stationary position of the eccentric block 203 of the vibratory roller wheel 201. The inductive sensor 212 transmits voltage or current signals to the data processing device 22.

[0079] The satellite positioning device 24 acquires the three-dimensional spatial information of the vibratory roller and inputs the data into the data processing device 22.

[0080] The data processing device 22 processes various types of input data, including: filtering the acceleration of the vibrating wheel 201 and the upper frame 202, and calculating the vertical vibration displacement of the vibrating wheel 201; and calculating the vertical component of the excitation force F at any time t based on the voltage / current data output by the inductive sensor 212. v (t); based on the acceleration of the vibrating wheel 201, the upper frame 202, and F v (t) Calculate the interaction force between the vibratory roller and the subgrade / pavement ; Calculate the compaction stiffness k of the roadbed and pavement r ; Calculate the speed of the vibratory roller; Match the roller's position information with the compaction stiffness k of the subgrade and pavement. r The data processing device 22 outputs the processed information to the display device 25.

[0081] The data processing device 22 supports the data processing process in steps S2-S5.

[0082] The display device 25 can be a vehicle-mounted display device 25 or a remote monitoring display device 25. The displayed content includes: the position of the vibratory roller, the speed of the vehicle, the number of compaction passes, and the compaction status of the roadbed and pavement.

[0083] In step S1, during the acquisition of the vertical vibration acceleration of the upper frame 202 and the vertical vibration acceleration of the vibratory roller 201, the vibratory roller generates vibration by rotating the eccentric block 203 of the vibratory roller through the rotation of the vibratory motor's rotating shaft. The target time can be the current time. Therefore, acquiring the vertical vibration acceleration signal and the rotation signal of the eccentric block 203 of the vibratory roller at the target time specifically involves: real-time acquisition of the vertical acceleration of the vibratory roller 201 and the upper frame 202, and the rotation signal of the eccentric block 203. The target time can also be a historical time. In this case, the acquisition of the vertical vibration acceleration signal and the rotation signal of the eccentric block 203 of the vibratory roller at the target time specifically involves: acquiring the vertical vibration acceleration signal and the rotation signal of the eccentric block 203 of the vibratory roller at that historical time from the database; acquiring the current vertical vibration acceleration signal of the vibratory roller through the acceleration acquisition device installed on the frame 202 and the vibratory wheel 201 of the vibratory roller; and acquiring the rotation signal of the eccentric block 203 through the eccentric block 203 rotation device.

[0084] In one specific implementation, S2, the vertical vibration acceleration of the upper frame 202 and the vertical vibration acceleration of the vibrating wheel 201 are filtered, and the vibration displacement of the vibrating wheel 201 is obtained based on frequency domain integration. Specifically, this includes: using low-pass filtering to filter the acceleration of the upper frame 202 and the vibrating wheel 201; and using frequency domain integration to obtain the vibration displacement of the vibrating wheel 201. The relevant processing algorithm is existing technology.

[0085] In one specific implementation, S3, based on the rotation signal of the eccentric block 203, the vertical component of the excitation force F at time t is obtained within one vibration cycle. v (t):

[0086] This step mainly analyzes the rotation signal of eccentric block 203 and constructs the vertical component of the excitation force F at time t. v (t). Due to the damping of the vibratory roller-soil system, there is a phase difference between the displacement of the vibratory wheel 201 and the excitation force. The inertial force of the vibratory wheel 201 and the inertial force of the upper frame 202 can be determined by real-time acquisition of acceleration signals; the magnitude of the vertical component of the excitation force is related to the position of the eccentric block 203. When the eccentric block 203 is at its lowest position, the vertical component of the excitation force is the largest. Therefore, the function of the change of the vertical component of the excitation force with time can be constructed by monitoring the position of the eccentric block 203. The method is to construct it in one vibration cycle (from the time when the eccentric block 203 is at its lowest position to the time when it is at its lowest position again):

[0087] Assuming that during a certain vibration cycle, the first change in the output voltage / current of the inductive sensor 212 occurs between times t1 and t2, and the next change occurs between times t3 and t4, then the time when the eccentric block 203 first reaches its lowest position is... The next time it will be at the bottom position is .

[0088] The vertical component of the excitation force F v The formula for (t) is formula (1):

[0089] (1)

[0090] in, For the mass of eccentric block 203, For the eccentricity, F is the vibration frequency of the road roller. v (t) represents the time period. to Vertical component of the excitation force over a given time period;

[0091] Where t1 is the start time of the first change in voltage or current, t2 is the end time of the first change in voltage or current, t3 is the start time of the next change in voltage or current, and t4 is the end time of the next change in voltage or current.

[0092] The specific principle behind this step is as follows:

[0093] Because the vibratory roller-soil system has damping, there is a phase difference between the displacement of the vibratory wheel 201 and the excitation force. Determining the position of the eccentric block 203 is crucial. The eccentric block rotation detection device 23 of this invention, as shown... Figure 5 As shown, the eccentric block rotation detection device 23 includes a mounting frame 211 and an inductive sensor 212. The mounting frame 211 is vertically installed, with one end fixed to the inside of the upper frame 202 and the other free end extending to the area where the eccentric block 203 is stationary (the lowest position). The inductive sensor 212 is installed on the free end of the mounting frame 211, directly facing the area where the eccentric block 203 is stationary (the lowest position). The eccentric block 203 is connected to the vibratory roller shaft. When the vibratory roller is working, the vibratory roller 201 moves forward and backward, and the eccentric block 203 rotates together with the vibratory roller shaft.

[0094] In this embodiment, the inductive sensor 212 generates a high-frequency alternating electromagnetic field. When the eccentric block 203 rotates through this electromagnetic field, eddy currents are generated inside. These eddy currents, in turn, affect the electromagnetic field, causing the oscillation of the inductive sensor 212 oscillator to weaken or even stop. This, in turn, affects the output voltage / current signal of the sensor after passing through the trigger circuit and the amplification output circuit.

[0095] Figure 6As an example of the change in output voltage / current signal, as shown in the figure, at time t1, the eccentric block 203 begins to enter the electromagnetic field range of the inductive sensor 212, and the output voltage / current signal begins to change. At time t2, the eccentric block 203 completely leaves the electromagnetic field range of the inductive sensor 212, and the voltage / current signal returns to stability. This indicates that the eccentric block 203... At its lowest position, the vertical component of the excitation force is at its maximum. Similarly, after eccentric block 203 rotates one revolution, it begins to enter the electromagnetic field at time t3 and completely leaves the electromagnetic field at time t4. At its lowest position, the vertical component of the excitation force is at its maximum. .but ~ Vertical component of the excitation force at any time t within the time interval for .

[0096] In one specific implementation method, S4, based on the vertical component of the excitation force F v (t) The mass of the vibrating wheel 201, the mass of the upper frame 202, the vertical vibration acceleration of the upper frame 202, and the vertical vibration acceleration of the vibrating wheel 201 are used to obtain the wheel-soil interaction force F of the road roller. s (t) includes:

[0097] The wheel-soil interaction force F of the road roller s The formula for (t) is formula (2):

[0098] (2)

[0099] in, The mass of the vibrating wheel 201; For the mass of the upper rack 202; It is the acceleration due to gravity; The vertical vibration acceleration of the vibrating wheel 201; The vertical vibration acceleration of the upper frame 202.

[0100] In one specific implementation, S5, based on the wheel-soil interaction force F of the road roller. s (t) and the vibration displacement of the vibrating wheel 201 are used to obtain the roadbed and pavement compaction stiffness, including:

[0101] As the stiffness of the roadbed and pavement increases, the interaction force between the vibratory roller 201 and the roadbed and pavement also gradually increases. In the initial stage of compaction, the vibratory roller 201 remains in contact with the roadbed and pavement, such as... Figure 3 As shown, when the vibratory wheel 201 is in continuous contact with the roadbed and pavement, the roadbed and pavement compaction stiffness kr The calculation formula is formula (3):

[0102] (3)

[0103] in, This represents the maximum vibration displacement. This represents the minimum vibration displacement.

[0104] This represents the interaction force between the roller and the roadbed / pavement corresponding to the maximum vibration displacement.

[0105] This represents the interaction force between the roller and the subgrade / pavement corresponding to the minimum vibration displacement.

[0106] During the later stages of compaction, the stiffness of the subgrade and pavement increases, and the interaction force between the vibratory roller 201 and the subgrade and pavement increases, which can lead to bouncing vibrations. Figure 4 As shown, when the vibrating wheel 201 is in a jumping vibration state, the roadbed and pavement compaction stiffness k r The calculation formula is formula (4):

[0107] (4)

[0108] in, This represents the maximum vibration displacement. This represents the minimum vibration displacement. This represents the interaction force between the roller and the subgrade / pavement corresponding to the maximum vibration displacement.

[0109] In a second aspect, the present invention provides a method for controlling the compaction of roadbed and pavement, comprising the above-mentioned method for continuous detection of the compaction stiffness of roadbed and pavement, and further comprising:

[0110] A1. The location information of the road roller is obtained 24 / 7 based on a satellite positioning device, yielding location information parameters. The current location information of the vibratory road roller can be determined through a satellite positioning module. Specifically, the satellite positioning module may include a satellite receiver, a wireless communication antenna, a satellite base station, and a satellite. The satellite receiver can be installed on top of the vibratory road roller to receive satellite signals and receive satellite base station signals through the wireless communication antenna. Then, the location coordinates of the vibratory road roller are determined according to a differential algorithm.

[0111] A2. Calculate the subgrade and pavement compaction stiffness corresponding to the current location information based on the continuous detection method of subgrade and pavement compaction stiffness, and obtain the subgrade and pavement compaction stiffness parameters;

[0112] A3. Based on location information parameters and subgrade and pavement compaction stiffness parameters, construct the correspondence between location information and subgrade and pavement compaction stiffness;

[0113] Based on the sampling times of the acceleration signal and the rotation signal of the eccentric block 203, the position of the vibratory roller measured at this time is determined, and the roadbed and pavement stiffness are correlated with the position information. By constructing the correspondence between the position information of the vibratory roller and the roadbed and pavement stiffness, the compaction information of each compaction position can be obtained, and the compaction quality of each compaction position can also be obtained based on this correspondence.

[0114] The display module within the continuous roadbed and pavement compaction stiffness monitoring system supports displaying the roadbed and pavement compaction stiffness of the road sections traversed by the roller. The onboard display module of the vibratory roller can display the real-time relationship between the current position and operating status of the vibratory roller. Specifically, the LCD screen of the onboard display module can be installed in the cab, displaying the compaction surface, compaction strips, vibratory roller position, corresponding vibration frequency, and wheel-soil interaction force in real time, allowing the compaction operator to monitor the vibratory roller's operating status and take appropriate measures. The roadbed and pavement stiffness and vibratory roller position can also be transmitted via GPRS to a storage module for storage, for display on the monitoring platform and subsequent analysis.

[0115] A4. Based on the correspondence between location information and roadbed and pavement compaction stiffness, drive the road roller to the road section that has not reached the qualified compaction quality for compaction.

[0116] Set the threshold value for roadbed and pavement compaction stiffness as k. ra ;

[0117] Based on the correspondence between location information and subgrade and pavement compaction stiffness, subgrade and pavement compaction stiffness < k was selected. ra The corresponding road sections were identified as substandard.

[0118] Drive the road roller to compact the substandard road sections until the corresponding subgrade compaction stiffness is ≥k. ra .

[0119] If the compaction pass rate consistently fails to meet the specified value, an alarm will be issued to notify relevant personnel to handle the situation.

[0120] One specific implementation method, such as Figures 7 to 8 As shown, a field test was carried out on a highway subgrade. Every 0.5m along the test strip was taken as a continuous test unit, and the average stiffness within a test unit was taken as the continuous test value of that test unit. Figure 7 For different numbers of compaction passes, the compaction stiffness k is given. r The distribution and changes within the test strip are shown in the figure. As can be seen from the figure, the compaction stiffness at all points in the strip increases with the number of compaction passes, and basically stabilizes after the 8th compaction pass. The subgrade compaction degree was measured after each compaction pass. Figure 8 For the compaction stiffness k rThe correlation between the index and the compaction degree K shows that the correlation coefficient R reaches 0.87, indicating a strong correlation. This demonstrates that the index proposed in this method can achieve continuous detection of the compaction quality of highway subgrade and pavement.

[0121] This invention can acquire the vertical vibration acceleration signal and the rotation signal of the eccentric block 203 of a vibratory roller at a target time, and determine the working state of the vibratory roller at the target time based on the vertical vibration acceleration signal and the rotation signal. The working state of the vibratory roller includes the vibration frequency of the vibratory roller and the wheel-soil interaction force. This enables monitoring of the working state of the vibratory roller, which is of great significance for ensuring the compaction quality and improving the compaction efficiency of the vibratory roller.

[0122] This invention enables continuous detection of the stiffness of roadbed and pavement during the entire rolling process. It features high accuracy of detection indicators, convenient and detachable device installation, and is applicable to various types of fillers for roadbeds and pavements as well as various models of vibratory rollers.

[0123] The following points need to be explained:

[0124] (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0125] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the invention, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0126] (3) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0127] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for continuous testing of roadbed and pavement compaction stiffness, characterized in that, include: S1. Build a continuous detection system for roadbed and pavement compaction stiffness. Based on the continuous detection device for roadbed and pavement compaction stiffness, collect the vertical vibration acceleration of the upper frame, the vertical vibration acceleration signal of the vibrating wheel, and the rotation signal of the eccentric block. S2. Filter the vertical vibration acceleration of the upper frame and the vertical vibration acceleration of the vibrating wheel, and obtain the vibration displacement of the vibrating wheel based on frequency domain integration; S3. Based on the eccentric block rotation signal, the vertical component of the excitation force F at time t is obtained within one vibration cycle. v (t); S4, based on the vertical component of the excitation force F v (t) The mass of the vibratory wheel, the mass of the upper frame, the vertical vibration acceleration of the upper frame, and the vertical vibration acceleration of the vibratory wheel are used to obtain the wheel-soil interaction force F of the road roller. s (t); S5, Wheel-soil interaction force F based on road roller s (t) and the vibration displacement of the vibrating wheel are used to obtain the compaction stiffness of the roadbed and pavement.

2. The method for continuous detection of roadbed and pavement compaction stiffness according to claim 1, characterized in that, The continuous detection system for subgrade and pavement compaction stiffness in S1 includes: The acceleration signal acquisition device collects the vertical vibration acceleration of the upper frame and the vertical vibration acceleration of the vibrating wheel in real time and sends the vertical vibration acceleration of the upper frame and the vertical vibration acceleration of the vibrating wheel to the data processing device. The eccentric block rotation detection device acquires the eccentric block rotation signal of the road roller and sends the eccentric block rotation signal to the data processing device; The satellite positioning device acquires the three-dimensional spatial information of the road roller and transmits the three-dimensional spatial information to the data processing device; The data processing device analyzes the received vertical vibration acceleration of the upper frame, vertical vibration acceleration of the vibrating wheel, eccentric block rotation signal, and three-dimensional spatial information of the roller to obtain the compaction stiffness of the roadbed and pavement. The display device is connected to the data processing device and is used to display the data analysis process and results of the data processing device.

3. The method for continuous detection of roadbed and pavement compaction stiffness according to claim 2, characterized in that, The acceleration signal acquisition device includes: a first acceleration sensor and a second acceleration sensor; The first acceleration sensor is mounted on the vibrating wheel; The second acceleration sensor is mounted on the upper frame.

4. The method for continuous detection of roadbed and pavement compaction stiffness according to claim 3, characterized in that, The eccentric block rotation detection device includes: an inductive sensor and a mounting bracket; One end of the mounting bracket is vertically mounted on the upper frame, and the other end of the mounting bracket is used to mount an inductive sensor; When the eccentric block is stationary, the inductive sensor faces the side surface of the bottom end of the eccentric block.

5. The method for continuous detection of subgrade and pavement compaction stiffness according to claim 4, characterized in that, Based on the eccentric block rotation signal, the vertical component of the excitation force F at time t is obtained within one vibration cycle in S3. v (t) includes: The vertical component of the excitation force F v The formula for (t) is formula (1): ；（1） in, For the mass of the eccentric block, For the eccentricity, F is the vibration frequency of the road roller. v (t) represents the time period. to Vertical component of the excitation force over a given time period; Where t1 is the start time of the first change in voltage or current, t2 is the end time of the first change in voltage or current, t3 is the start time of the next change in voltage or current, and t4 is the end time of the next change in voltage or current.

6. The method for continuous detection of subgrade and pavement compaction stiffness according to claim 5, characterized in that, The vertical component F of the excitation force in S4 v (t) The mass of the vibratory wheel, the mass of the upper frame, the vertical vibration acceleration of the upper frame, and the vertical vibration acceleration of the vibratory wheel are used to obtain the wheel-soil interaction force F of the road roller. s (t) includes: The wheel-soil interaction force F of the road roller s The formula for (t) is formula (2): ；（2） in, The mass of the vibrating wheel; For the quality of the upper rack; It is the acceleration due to gravity; This refers to the vertical vibration acceleration of the vibrating wheel; This refers to the vertical vibration acceleration of the upper frame.

7. The method for continuous detection of subgrade and pavement compaction stiffness according to claim 6, characterized in that, The wheel-soil interaction force F based on the road roller in S5 s (t) and the vibration displacement of the vibratory wheel are used to obtain the compaction stiffness of the roadbed and pavement, including: When the vibratory roller is in continuous contact with the subgrade and pavement, the compaction stiffness k of the subgrade and pavement is... r The calculation formula is formula (3): ；（3） in, This represents the maximum vibration displacement. This represents the minimum vibration displacement. This represents the interaction force between the roller and the roadbed / pavement corresponding to the maximum vibration displacement. This represents the interaction force between the roller and the subgrade / pavement corresponding to the minimum vibration displacement. When the vibratory wheel is in a jumping vibration state, the compaction stiffness k of the subgrade and pavement r The calculation formula is formula (4): ；（4） in, This represents the maximum vibration displacement. This represents the minimum vibration displacement. This represents the interaction force between the roller and the subgrade / pavement corresponding to the maximum vibration displacement.

8. A method for controlling the compaction of roadbed and pavement, characterized in that, The method for continuous testing of compaction stiffness of subgrade and pavement as described in any one of claims 1 to 7 further includes: The location information parameters of the road roller are obtained by constantly acquiring the location information of the road roller using a satellite positioning device. The subgrade and pavement compaction stiffness parameters are obtained by calculating the subgrade and pavement compaction stiffness corresponding to the current location information based on the continuous detection method of subgrade and pavement compaction stiffness. Based on location information parameters and subgrade and pavement compaction stiffness parameters, a correspondence between location information and subgrade and pavement compaction stiffness is constructed. Based on the correspondence between location information and roadbed and pavement compaction stiffness, the road roller is driven to compact sections that have not yet met the compaction quality standards.

9. The method for controlling roadbed and pavement compaction according to claim 8, characterized in that, The method of driving a road roller to compact sections that have not met the compaction quality standards, based on the correspondence between location information and roadbed / pavement compaction stiffness, includes: Set the threshold value for roadbed and pavement compaction stiffness as k. ra ; Based on the correspondence between location information and subgrade and pavement compaction stiffness, subgrade and pavement compaction stiffness < k was selected. ra The corresponding road sections were identified as substandard. Drive the road roller to compact the substandard road sections until the corresponding subgrade compaction stiffness is ≥k. ra .

10. The method for controlling roadbed and pavement compaction according to claim 9, characterized in that, The display module within the continuous detection system for roadbed and pavement compaction stiffness supports displaying the roadbed and pavement compaction stiffness of the road sections traversed by the road roller.

Images