A method for determining the surface water retention of open-pit mine transport roads

Abstract

This invention belongs to the field of road dust control technology. It relates to a method for determining the surface water retention of open-pit mine transport roads, comprising the following steps: First, under laboratory conditions, basic data on the surface water content of the transport road and different environmental parameters are obtained, establishing basic data on the relationships between "water content-temperature-time," "water content-humidity-time," and "water content-wind speed-time." Second, using the basic data established in the first step, the surface water retention of the transport road at any cumulative time is calculated, thereby determining whether to spray water onto the road surface. This invention, by establishing basic data on the relationships between "water content-temperature-time," "water content-humidity-time," and "water content-wind speed-time," enables real-time calculation of the surface water retention of transport roads after spraying clean water or dust suppressants based on changes in meteorological parameters. This provides data support for intelligent decision-making regarding the timing of spraying transport roads, improves dust suppression efficiency, and saves water resources.

Description

Technical Field

[0001] This invention belongs to the field of road dust control technology and relates to a method for determining the surface water retention of open-pit mine transportation roads. Background Technology

[0002] Dust pollution from open-pit mine transport roads is one of the main dust sources in open-pit mines. Because transport roads are mostly simple dirt surfaces, and transport trucks carry heavy loads, experience significant disturbance, and are highly dynamic, dust control is extremely difficult. The main method for controlling road dust is to use water trucks or spray systems on fixed transport roads to spray water or dust suppressants onto the road surface to increase the moisture content. This causes small dust particles to combine into larger particles, reducing the likelihood of dust being stirred up by transport trucks and thus achieving dust suppression.

[0003] The surface moisture content of transport roads is a crucial indicator affecting dust suppression efficiency. After spraying with water trucks or spraying devices, the surface moisture content decreases under the influence of meteorological conditions such as temperature, humidity, and wind speed. Currently, the main methods for maintaining road surface moisture content are manual observation or preset spraying frequencies based on experience. However, manual observation of dust suppression conditions on transport roads requires manpower and is inconsistent with the direction of intelligent and unmanned construction in mining. Preset spraying frequencies based on experience are also problematic because meteorological changes significantly affect surface moisture content, potentially leading to excessively high or low spraying frequencies. Excessively high frequencies result in water waste, while excessively low frequencies lead to poor dust suppression effects. Summary of the Invention

[0004] In view of this, the purpose of this invention is to solve the above problems and provide a method for determining the surface water retention of open-pit mine transport roads. This method calculates the surface water retention of transport roads after spraying water or dust suppressants in real time by changing meteorological condition parameters, providing data support for intelligent decision-making on the timing of spraying transport roads, improving the dust suppression efficiency of transport roads, reducing labor costs, and saving water resources.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for determining the surface water retention of an open-pit mine transport road includes the following steps:

[0007] The first step is to obtain basic data on the surface moisture content of transportation roads and different environmental parameters under laboratory conditions, and establish basic data on the relationships between "moisture content-temperature-time", "moisture content-humidity-time", and "moisture content-wind speed-time".

[0008] The second step involves using the relationship-based data established in the first step to calculate the surface water retention of the transport road over any cumulative time period, thereby determining whether to spray water onto the road surface.

[0009] Furthermore, in the first step, the method for establishing the basic data on the relationship between "moisture content-temperature-time" is as follows: Soil and rock from the transportation road surface at the application site are filled into a petri dish, sprayed with water or a specified dust suppressant, and then placed in a constant temperature and humidity chamber. The changes in the moisture content of the soil and rock within the petri dish are tested at different time intervals under different temperature gradients, resulting in curves showing the change in surface moisture content of the soil and rock under different temperature conditions. Based on the experimental results, these curves are fitted into a power function.

[0010] (1)

[0011] In the formula, is the constant for fitting; Moisture content under the influence of temperature; The test temperature is t, and the test is conducted according to the set temperature gradient; t is the time.

[0012] Furthermore, in the first step, the method for establishing the basic data on the relationship between "moisture content-humidity-time" is as follows: Soil and rock from the transportation road surface at the application location are filled into a petri dish, sprayed with water or a specified dust suppressant, and then placed in a constant temperature and humidity chamber. The changes in soil and rock moisture content within the petri dish are tested at different time periods under different humidity gradients, resulting in curves showing the change in surface moisture content under different humidity conditions. Based on the experimental results, a power function is fitted.

[0013] (2)

[0014] In the formula, is the constant for fitting; Moisture content under the influence of humidity; To test the humidity, the test is conducted according to the set humidity gradient; t is the time.

[0015] Furthermore, in the first step, the method for establishing the basic data of the "moisture content-wind speed-time" relationship is as follows: Soil and rock from the surface of the transportation road at the application site are filled into petri dishes, sprayed with water or a specified dust suppressant, and a blower is used to blow air onto the petri dishes at different speeds. The change in the moisture content of the soil and rock in the petri dishes is tested at different time periods. Based on the experimental results, a power function is fitted.

[0016] (3)

[0017] In the formula, is the constant for fitting; Moisture content under the influence of humidity; To test the wind speed, the test was conducted according to the set wind speed gradient; t is the time.

[0018] Furthermore, in the second step, the method for calculating the surface water retention of the transport road over any cumulative time is as follows:

[0019] When the concentration of spraying on the transport road is When using clean water or dust suppressant to suppress dust, the current temperature, humidity and wind speed are collected in real time. According to formula (1)~(3), the change in water retention is calculated at each set time interval by linear interpolation. The calculation is continuously accumulated to any time to obtain the water retention of the transportation road.

[0020] Furthermore, the formula for calculating the surface moisture content of roads is:

[0021] (4)

[0022] In the formula, Current road moisture content, L / m 2 ;

[0023] The total amount of water or dust suppressant sprayed on the road, in L / m³ 2 ;

[0024] —Current ambient temperature, °C;

[0025] —Current road moisture content, L / m³ 2 ;

[0026] —Current ambient humidity, %RH;

[0027] —Current ambient wind speed, m / s;

[0028] N—Cumulative number of calculations;

[0029] —Calculate the interval time, taking 1 minute;

[0030] — Rate of change of water content at current temperature and water content, in L / m³ 2 *s;

[0031] — Rate of change of moisture content under current humidity and moisture content conditions, L / m 2 *s;

[0032] — Rate of change of water content under current wind speed and water content conditions, L / m 2 *s;

[0033] —Rate of change of moisture content at a relative humidity of 80% and under the current moisture content conditions, in L / m³ 2 *s;

[0034] — Rate of change of current moisture content under windless conditions, L / m 2 *s.

[0035] Furthermore, the rate of change of water content under the current temperature and water content conditions. The calculation formula is:

[0036] (5)

[0037] in, j takes a natural number. Take temperature values ​​according to the set gradient;

[0038] Equation (3) represents the moisture content at a temperature of The curve showing the change of time over time t;

[0039] (6)

[0040] Taking the first derivative of equation (6), we obtain the rate of change of water content:

[0041] (7)

[0042] Take the inverse function of equation (6):

[0043] (8)

[0044] Combining equations (4) and (5), we obtain the rate of change of water content under the current temperature and water content conditions:

[0045] (9)

[0046] Similarly, we can conclude that:

[0047]

[0048] This represents the rate of change of water content at the next gradient temperature.

[0049] Furthermore, the formula for calculating the rate of change of moisture content under the current humidity and moisture content conditions is as follows:

[0050] (10)

[0051] in, j takes a natural number. Humidity values ​​are taken according to the set gradient;

[0052] Moisture content at humidity The curve showing the change of time with time t is as follows:

[0053] (11)

[0054] Taking the first derivative of equation (11), we obtain the rate of change of water content:

[0055] (12)

[0056] Take the inverse function of equation (11):

[0057] (13)

[0058] Combining equations (12) and (13), we obtain the rate of change of water content under the current humidity and moisture content conditions:

[0059] (14)

[0060] Similarly, we can conclude that:

[0061] (15)

[0062] This represents the rate of change of water content under the next humidity gradient.

[0063] Furthermore, the formula for calculating the rate of change of water content under the current wind speed and water content conditions is as follows:

[0064] (16)

[0065] in, j takes a natural number. Take wind speed values ​​according to the set gradient;

[0066] Moisture content at wind speed The curve showing the change of time with time t is as follows:

[0067] (17)

[0068] Taking the first derivative of equation (17), we obtain the rate of change of water content:

[0069] (18)

[0070] Take the inverse function of equation (17):

[0071] (19)

[0072] Combining equations (18) and (19), we obtain the rate of change of water content under the current wind speed and water content conditions:

[0073] (20)

[0074] Similarly, we can conclude that:

[0075] (twenty one)

[0076] This represents the rate of change of water content at the next gradient wind speed.

[0077] Furthermore, when rainfall is detected, the spray concentration... Increase and recalculate the water retention capacity.

[0078] The beneficial effects of this invention are as follows:

[0079] This invention establishes basic data on the relationships between "moisture content-temperature-time", "moisture content-humidity-time", and "moisture content-wind speed-time" to enable real-time calculation of the surface moisture retention of transport roads after spraying water or dust suppressants based on changes in meteorological parameters. This provides data support for intelligent decision-making on the timing of spraying transport roads, improves dust suppression efficiency, reduces labor costs, and saves water resources.

[0080] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0081] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0082] Figure 1 This is a flowchart of the method for determining the surface water retention of open-pit mine transportation roads in this invention. Detailed Implementation

[0083] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0084] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0085] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0086] Please see Figure 1 This is a flowchart illustrating a method for determining the surface water retention of an open-pit mine transport road, including the following steps:

[0087] The first step is to obtain basic data on the surface moisture content of transportation roads and different environmental parameters under laboratory conditions, and establish basic data on the relationships between "moisture content-temperature-time", "moisture content-humidity-time", and "moisture content-wind speed-time".

[0088] The second step involves using the relationship-based data established in the first step to calculate the surface water retention of the transport road over any cumulative time period, thereby determining whether to spray water onto the road surface.

[0089] The method for establishing the basic data on the relationship between "moisture content-temperature-time" in the first step is as follows: Soil and rock from the transportation road surface at the application site are filled into petri dishes, sprayed with water or a specified dust suppressant, and then placed in a constant temperature and humidity chamber. The changes in the moisture content of the soil and rock in the petri dishes are tested at different time periods under different temperature gradients, resulting in curves showing the change in surface moisture content of the soil and rock under different temperature conditions. Based on the experimental results, a power function is fitted.

[0090] (1)

[0091] In the formula, is the constant for fitting; Moisture content under the influence of temperature; The test temperature is t, and the test is conducted according to the set temperature gradient; t is the time.

[0092] The method for establishing the basic data on the relationship between "moisture content-humidity-time" in the first step is as follows: Soil and rock from the transportation road surface at the application site are filled into petri dishes, sprayed with water or a specified dust suppressant, and then placed in a constant temperature and humidity chamber. The changes in soil and rock moisture content within the petri dishes are tested at different time periods under different humidity gradients, resulting in curves showing the change in surface moisture content under different humidity conditions. Based on the experimental results, a power function is fitted.

[0093] (2)

[0094] In the formula, is the constant for fitting; Moisture content under the influence of humidity; To test the humidity, the test is conducted according to the set humidity gradient; t is the time.

[0095] The method for establishing the basic data of the "moisture content-wind speed-time" relationship in the first step is as follows: Soil and rock from the surface of the transportation road at the application site are filled into petri dishes, sprayed with water or a specified dust suppressant, and a blower is used to blow air through the petri dishes at different speeds. The change in soil and rock moisture content within the petri dishes is tested at different time periods. Based on the experimental results, a power function is fitted.

[0096] (3)

[0097] In the formula, is the constant for fitting; Moisture content under the influence of humidity; To test the wind speed, the test was conducted according to the set wind speed gradient; t is the time.

[0098] In the second step, the method for calculating the surface water retention of the transport road over any cumulative time is as follows:

[0099] When the concentration of spraying on the transport road is When using clean water or dust suppressant to suppress dust, the current temperature, humidity and wind speed are collected in real time. According to formula (1)~(3), the change in water retention is calculated at each set time interval by linear interpolation. The calculation is continuously accumulated to any time to obtain the water retention of the transportation road.

[0100] The formula for calculating the surface moisture content of a road is:

[0101] (4)

[0102] In the formula, Current road moisture content, L / m 2 ;

[0103] The total amount of water or dust suppressant sprayed on the road, in L / m³2 ;

[0104] —Current ambient temperature, °C;

[0105] —Current road moisture content, L / m³ 2 ;

[0106] —Current ambient humidity, %RH;

[0107] —Current ambient wind speed, m / s;

[0108] N—Cumulative number of calculations;

[0109] —Calculate the interval time, taking 1 minute;

[0110] — Rate of change of water content at current temperature and water content, in L / m³ 2 *s;

[0111] — Rate of change of moisture content under current humidity and moisture content conditions, L / m 2 *s;

[0112] — Rate of change of water content under current wind speed and water content conditions, L / m 2 *s;

[0113] —Rate of change of moisture content at a relative humidity of 80% and under the current moisture content conditions, in L / m³ 2 *s;

[0114] — Rate of change of current moisture content under windless conditions, L / m 2 *s.

[0115] Rate of change of water content under current temperature and water content conditions The calculation formula is:

[0116] (5)

[0117] in, j takes a natural number. Take temperature values ​​according to the set gradient;

[0118] The temperature gradient value can be selected as follows: , , , , , ， Other gradients can also be selected for testing.

[0119] Equation (3) represents the moisture content at a temperature of The curve showing the change of time over time t;

[0120] (6)

[0121] Taking the first derivative of equation (6), we obtain the rate of change of water content:

[0122] (7)

[0123] Take the inverse function of equation (6):

[0124] (8)

[0125] Combining equations (4) and (5), we obtain the rate of change of water content under the current temperature and water content conditions:

[0126] (9)

[0127] Similarly, we can conclude that:

[0128]

[0129] This represents the rate of change of water content at the next gradient temperature.

[0130] The formula for calculating the rate of change of moisture content under the current humidity and moisture content conditions is:

[0131] (10)

[0132] in, j takes a natural number. Humidity values ​​are taken according to the set gradient;

[0133] The humidity gradient value can be selected as follows: , , , , ， Other gradients can also be selected for testing.

[0134] Moisture content at humidity The curve showing the change of time with time t is as follows:

[0135] (11)

[0136] Taking the first derivative of equation (11), we obtain the rate of change of water content:

[0137] (12)

[0138] Take the inverse function of equation (11):

[0139] (13)

[0140] Combining equations (12) and (13), we obtain the rate of change of water content under the current humidity and moisture content conditions:

[0141] (14)

[0142] Similarly, we can conclude that:

[0143] (15)

[0144] This represents the rate of change of water content under the next humidity gradient.

[0145] The formula for calculating the rate of change of water content under the current wind speed and water content conditions is:

[0146] (16)

[0147] in, j takes a natural number. Take wind speed values ​​according to the set gradient;

[0148] The wind speed gradient can be selected as follows: , , , ， Other gradients can also be selected for testing.

[0149] Moisture content at wind speed The curve showing the change of time with time t is as follows:

[0150] (17)

[0151] Taking the first derivative of equation (17), we obtain the rate of change of water content:

[0152] (18)

[0153] Take the inverse function of equation (17):

[0154] (19)

[0155] Combining equations (18) and (19), we obtain the rate of change of water content under the current wind speed and water content conditions:

[0156] (20)

[0157] Similarly, we can conclude that:

[0158] (twenty one)

[0159] This represents the rate of change of water content at the next gradient wind speed.

[0160] When rainfall is detected, the spray concentration is... Increase and recalculate the water retention capacity.

[0161] Calculation Example

[0162] (1) Conduct basic data experiments on the relationship between "moisture content-temperature-time", "moisture content-humidity-time", and "moisture content-wind speed-time" in the laboratory. The spraying medium is clean water, and the calculation functions (1)~(3) are obtained.

[0163] (2) The initial water spraying volume of the open-pit mine transport road is 1L / m 2 Set the calculation interval to 1 minute;

[0164] (3) Calculate the change in water content during the first minute interval:

[0165] ① The current temperature is 31℃, humidity is 62%RH, and wind speed is 5.3m / s;

[0166] ② Calculate the rate of change of water content under the current temperature, humidity, and wind speed using formulas (5), (7), and (16), respectively;

[0167] ③ Substituting into formula (4), the water retention rate of the transport road after 1 minute is calculated to be 0.998 L / m. 2 ;

[0168] (4) Collect parameters such as temperature, humidity, and wind speed at the second minute, repeat the above calculations, and obtain the water retention rate of the transportation road after the second minute;

[0169] (5) By analogy, the surface water content after 1 hour was calculated to be 0.74 L / m. 2 This allows for the determination of the dispatching time of water trucks or the spraying timing of fixed spray piles.

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for determining the water retention of a surface of a haul road of an open pit mine, characterized in that, Includes the following steps: The first step is to obtain basic data on the surface moisture content of transportation roads and different environmental parameters under laboratory conditions, and establish basic data on the relationships between "moisture content-temperature-time", "moisture content-humidity-time", and "moisture content-wind speed-time". The second step is to use the relationship data established in the first step to calculate the surface water retention of the transport road at any cumulative time, so as to determine whether to spray water on the road surface. In the first step, the method for establishing the basic data of the "moisture content-temperature-time" relationship is as follows: Soil and rock from the transportation road surface at the application site are filled into petri dishes, sprayed with water or a specified dust suppressant, and then placed in a constant temperature and humidity chamber. The changes in soil and rock moisture content within the petri dishes are tested at different time intervals under different temperature gradients, resulting in curves showing the change in surface moisture content under different temperature conditions. Based on the experimental results, a power function is fitted. （1） wherein is a constant of fit; is the moisture content under the influence of temperature; is the test temperature, the test being performed in a temperature gradient; t is time; In the first step, the method for establishing the basic data of the "moisture content-humidity-time" relationship is as follows: Soil and rock from the transportation road surface at the application location are filled into petri dishes, sprayed with water or a specified dust suppressant, and then placed in a constant temperature and humidity chamber. The changes in soil and rock moisture content within the petri dishes are tested at different time periods under different humidity gradients, resulting in curves showing the change in surface moisture content under different humidity conditions. Based on the experimental results, a power function is fitted. （2） In the formula, is the constant for fitting; Moisture content under the influence of humidity; To test the humidity, the test was conducted according to the set humidity gradient; t represents time. In the first step, the method for establishing the basic data of the "moisture content-wind speed-time" relationship is as follows: Soil and rock from the surface of the transportation road at the application site are filled into petri dishes, sprayed with water or a specified dust suppressant, and a blower is used to blow air onto the petri dishes at different speeds. The change in moisture content of the soil and rock in the petri dishes is tested at different time periods. Based on the experimental results, a power function is fitted. (3) In the formula, is the constant for fitting; Moisture content under the influence of humidity; To test the wind speed, the test was conducted according to the set wind speed gradient; t is time. In the second step, the method for calculating the surface water retention of the transport road over any cumulative time is as follows: When the concentration of spraying on the transport road is When using clean water or dust suppressant to suppress dust, the current temperature, humidity and wind speed are collected in real time. According to formula (1)~(3), the change in water retention is calculated at each set time interval by linear interpolation. The calculation is continuously accumulated to any time to obtain the water retention of the transport road. The formula for calculating the surface moisture content of a road is: （4） In the formula, Current road moisture content, L / m 2 ; The total amount of water or dust suppressant sprayed on the road, in L / m³ 2 ; —Current ambient temperature, °C; —Current road moisture content, L / m³ 2 ; —Current ambient humidity, %RH; —Current ambient wind speed, m / s; N—Cumulative number of calculations; —Calculate the interval time, taking 1 minute; — Rate of change of water content at current temperature and water content, in L / m³ 2 *s; — Rate of change of moisture content under current humidity and moisture content conditions, L / m 2 *s; — Rate of change of water content under current wind speed and water content conditions, L / m 2 *s; —Rate of change of moisture content at a relative humidity of 80% and under the current moisture content conditions, in L / m³ 2 *s; — Rate of change of current moisture content under windless conditions, L / m 2 *s; Rate of change of water content under current temperature and water content conditions The calculation formula is: （5） in, j takes a natural number. Take temperature values ​​according to the set gradient; Equation (3) represents the moisture content at a temperature of The curve showing the change of time over time t; （6） Taking the first derivative of equation (6), we obtain the rate of change of water content: （7） Take the inverse function of equation (6): （8） Combining equations (4) and (5), we obtain the rate of change of water content under the current temperature and water content conditions: （9） Similarly, we can conclude that: This represents the rate of change of water content at the next gradient temperature; The formula for calculating the rate of change of moisture content under the current humidity and moisture content conditions is: （10） in, j takes a natural number. Humidity values ​​are taken according to the set gradient; Moisture content at humidity The curve showing the change of time with time t is as follows: （11） Taking the first derivative of equation (11), we obtain the rate of change of water content: （12） Take the inverse function of equation (11): （13） Combining equations (12) and (13), we obtain the rate of change of water content under the current humidity and moisture content conditions: （14） Similarly, we can conclude that: （15） This represents the rate of change of moisture content under the next humidity gradient. The formula for calculating the rate of change of water content under the current wind speed and water content conditions is: （16） in, j takes a natural number. Take wind speed values ​​according to the set gradient; Moisture content at wind speed The curve showing the change of time with time t is as follows: （17） Taking the first derivative of equation (17), we obtain the rate of change of water content: （18） Take the inverse function of equation (17): （19） Combining equations (18) and (19), we obtain the rate of change of water content under the current wind speed and water content conditions: （20） Similarly, we can conclude that: （21） This represents the rate of change of water content at the next gradient wind speed.

2. The method for determining the surface water retention of open-pit mine transport roads according to claim 1, characterized in that: When rainfall is detected, the spray concentration is... Increase and recalculate the water retention capacity.

Images