A method for measuring liquid properties and distribution characteristics in underground void areas

Abstract

The present invention discloses a method for measuring the properties and distribution characteristics of liquid in underground voids, and belongs to the technical field of underground void exploration and grouting treatment. The required measurement system includes: a data processing device, a centralized control device, a connecting device and a measuring unit. Among them: the data processing device is located on the surface, and is used to obtain measurement data and issue instructions for controlling the movement of the measuring unit; the centralized control device is fixed to the bottom of the vertical borehole as a position reference, receives the signal sent by the measuring device, transmits the instructions for controlling the movement of the measuring unit, and assists the measuring unit to achieve spatial movement; the connecting device is mainly a data line and other pipelines; the measuring unit can move in the liquid, and measure the surrounding liquid through integrated multiple liquid property sensors. The present invention does not require the construction of a large number of boreholes on the ground to realize the identification of liquids at any position in a large range of underground voids and the measurement of multiple liquid parameters, and can accurately and efficiently obtain the liquid properties and distribution characteristics of the underground voids.

Description

Technical Field

[0001] The invention relates to the technical field of underground void area exploration and grouting treatment, and in particular to a method for measuring liquid properties and distribution characteristics at different positions in an underground void area. Background Art

[0002] The mining of underground mineral resources destroys the original rock structure and forms a large range of underground voids, which can easily induce geological disasters such as surface collapse, seriously affecting the safety of life and property of residents on the ground and the development of the economy and society. Abandoned underground voids that have lost maintenance are often filled with water, which has a serious adverse effect on both the ongoing mining projects in the surrounding rock formations and the bearing structure of the underground voids themselves. At present, the ground grouting method is mostly used for the management of underground voids. This method injects slurry into the underground voids and the residual space of the rock formation, and fills the residual space of the underground voids after the slurry solidifies, which can eliminate the hidden dangers of geological disasters caused by underground voids from the root. However, as far as the management method of grouting to fill underground voids is concerned, the diffusion law of the slurry is still unclear, and there is a lack of more accurate monitoring methods and devices for the diffusion characteristics of the slurry. Due to the irregularity of the underground voids, single-point or single-direction measurements are difficult to meet the measurement requirements. Therefore, it is necessary to measure the liquid properties at multiple locations in the three-dimensional space, so as to comprehensively analyze the liquid properties and distribution characteristics of the underground voids.

[0003] At present, the research reports related to the existing technology mainly include:

[0004] Application No. 201410805907.5 discloses a method for measuring and controlling the diffusion range of grouting slurry in rock and soil bodies. The diffusion and distribution of grouting slurry are monitored and feedback is achieved by arranging temperature measurement points near the grouting area. The temperature measurement points can be achieved through grouting boreholes, special measurement boreholes or non-contact surfaces. The temperature change characteristics of the temperature measurement points at different times indirectly reflect the diffusion and solidification characteristics of the slurry, thereby realizing the monitoring of the slurry diffusion range.

[0005] Application No. 202011169516.0 discloses a grouting simulation experimental device and method for real-time monitoring of the slurry diffusion range. The grouting bucket is connected to a test box. A number of insulating wiring networks are arranged in the test box. A number of negative electrode plates connected to a grouting test operating table are evenly distributed on the wiring networks. During the grouting process, the slurry diffusion range is determined according to the position of the conductive negative electrode plate and the conductive time, thereby realizing real-time monitoring of the slurry diffusion.

[0006] Application No. 202021915736.9 discloses a test device for the diffusion range of slurry in a grouting simulation experiment, including a coal rock model, and also including: 1 positive electrode plate and multiple monitoring circuits composed of a negative electrode plate and an indicator light in series, the positive electrode plate is arranged at the grouting input port of the coal rock model, the negative electrode plate is arranged on the multi-layer wiring network in the coal rock model, the indicator light is arranged on the control console of the test box, the positive electrode plate is connected to the output positive pole of the power supply circuit in the test box, and each of the monitoring circuits is connected to the output negative pole of the power supply circuit in the test box. The conductivity of the grouting slurry is used to determine the slurry flow diffusion position through the positive electrode plate and the negative electrode plate, and the slurry diffusion information is processed through the control console to realize the monitoring of the simulated diffusion range of the grouting slurry.

[0007] The above-mentioned existing technologies mainly realize the measurement of liquid properties and diffusion characteristics through fixed measuring points densely distributed on the surface. It is impossible to measure multiple parameters and distribution characteristics of liquids at different positions (horizontal position and height) in underground voids with a single borehole or a few boreholes. The measurement work needs to be arranged in densely distributed measurement boreholes on the ground, which is a huge project and lacks flexibility. In addition, many related patented technologies are mostly limited to the field of simulation tests and lack practicality in field projects.

[0008] This shows that the prior art needs to be further improved. Summary of the invention

[0009] The purpose of the present invention is to provide a method for measuring the properties and distribution characteristics of liquid in underground voids, which only requires a few drill holes to measure multiple parameters of liquid at different locations in the underground void, greatly reducing the measurement workload and improving the measurement accuracy.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A method for measuring the properties and distribution characteristics of liquid in underground voids, comprising the following steps:

[0012] S1. Drill holes at the predetermined location;

[0013] S2. Arrange the required measurement system;

[0014] The measuring system comprises a data processing device, a centralized control device, a connecting device and a measuring unit;

[0015] arranging a data processing device on the surface;

[0016] The centralized control device is fixed to the bottom of the vertical borehole;

[0017] The connecting device is used to connect the measuring unit with the centralized control device to transmit motion signals and / or measurement data;

[0018] The measuring unit includes a sensor integrating liquid properties, a wireless signal transmitter and a motion mechanism. The sensors include liquid temperature, concentration, conductivity and flow rate sensors. The wireless signal transmitter transmits radio waves to the surrounding space at regular intervals. The radio waves enable the centralized control device to receive the signal to determine the position of the measuring unit relative to the centralized control device, or transmit the measurement data to the centralized control device in the form of wireless signals. The motion mechanism can move in the liquid in the underground empty area alone or in cooperation with the centralized control device.

[0019] The centralized control device is used as a position reference and is also used to receive wired or wireless signals from the measurement unit and assist the measurement unit in moving to any position in the underground empty area;

[0020] The data processing device generates instructions for controlling the movement of the measurement unit, determines the location of the underground empty area where the measurement unit is located, and analyzes the measurement data;

[0021] S3. When a single measuring unit is used to measure underground voids containing only water, the measuring unit is controlled to measure various parameters of the liquid in the underground voids within the maximum measuring range. The measuring path is centered or centered on the location or vertical direction of the centralized control device, and the measurement is performed in two paths: "one circle on the horizontal plane + different depths" or "one circle on the vertical plane + different directions".

[0022] S4. When measuring underground voids containing only water using a measuring line composed of multiple measuring units, the measuring line is controlled to extend outward from the centralized control device, sweeping the liquid horizontally or vertically in the form of a measuring line, and after rotating a certain angle, continues to sweep the liquid, thereby completing the measurement of the properties and distribution characteristics of the liquid within the measuring range;

[0023] S5. When a single measuring unit is used to measure the underground void area during grouting construction, if the underground void area contains water, a series of measuring operations of the properties and distribution characteristics of the groundwater must be carried out first. When grouting begins, the measuring unit is placed in a free state and moves with the slurry to measure the flow and diffusion characteristics of the slurry. After the slurry flow stabilizes, the measuring unit is controlled to measure various parameters of the liquid in the underground void area within the maximum measuring range. The measuring path is centered or axially with the location of the centralized control device or the vertical direction thereof, and the measurement is carried out in two paths: "one circle on the horizontal plane + different depths" or "one circle on the vertical plane + different directions".

[0024] S6. When measuring underground voids during grouting construction using a survey line composed of multiple measuring units, if the underground void contains water, a series of measurement operations on the properties and distribution characteristics of the groundwater must be carried out first. When grouting begins, the survey line is in a free state and moves with the slurry to measure the flow and diffusion characteristics of the slurry. After the slurry flow stabilizes, the survey line is controlled to extend outward from the centralized control device and sweep the liquid horizontally or vertically in the form of a survey line. After rotating a certain angle, it continues to sweep the liquid, thereby completing the measurement of the properties and distribution characteristics of the liquid within the measurement range.

[0025] In addition to the above measurement methods, the measuring unit can also be directly controlled to measure the liquid at any position within the maximum measurement range.

[0026] Compared with the prior art, the present invention brings the following beneficial technical effects:

[0027] The present invention proposes a method for measuring the properties and distribution characteristics of liquid in underground voids, which obtains multiple parameters of liquid in underground voids through a measuring unit whose position can be flexibly changed.

[0028] The method of the present invention can identify the properties of liquids at different locations in an underground void area; monitor the filling slurry parameters (flow rate, concentration, temperature) at different locations in the underground void area; and obtain the distribution characteristics of the liquid in the underground void area.

[0029] Compared with the prior art which requires the construction of a large number of exploration holes, the present invention only requires the construction of a few holes or even one hole to measure the liquid properties and diffusion characteristics of a large underground void area. This method greatly reduces the measurement workload and improves measurement efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings:

[0031] Figure 1 Schematic diagram of the measurement system proposed by the method of the present invention;

[0032] Figure 2 This is a flow chart of the present invention for measuring the properties of liquid in underground void areas;

[0033] Figure 3 This is a flow chart of the liquid property measurement process of underground void grouting in the present invention;

[0034] Figure 4 A measurement path diagram when a single measurement unit of the present invention is measured;

[0035] Figure 5 The arrangement of the measuring device and the measuring path diagram when the present invention measures in the form of a measuring line;

[0036] In the figure: Figure 4Where O is the position point of the top interface of the liquid near the centralized control device; O' is the position point of the bottom interface of the liquid just below point O; A1, A2, A3, ..., A n is the liquid bottom position point of the rock wall (or the boundary of the maximum measurement range); B1, B2, B3, ..., B n is the position point of the top surface of the liquid on the rock wall (or the boundary of the maximum measurement range); α is the angle between the two closed loops of vertical surface measurement;

[0037] Figure 5 0 is the state of the measuring line before the measurement starts; 1 is the state of the measuring line rotating from the horizontal direction to the vertical direction with the centralized control device as the center; 2 is the state of the measuring points on the measuring line being vertically distributed within the liquid height below the centralized control device; 3 is the state of the measuring line rotating from the vertical direction to the horizontal direction with the centralized control device as the center line. DETAILED DESCRIPTION

[0038] The present invention proposes a method for measuring the properties and distribution characteristics of liquid in underground voids. In order to make the advantages and technical solutions of the present invention clearer and more specific, the present invention is further described below in conjunction with specific embodiments.

[0039] The main sources of the technical concept of the present invention are as follows: when the existing technology measures the liquid in the underground void area, the layout of the measuring points causes a huge amount of ground drilling work, and even if the boreholes are densely distributed, there is liquid in the gaps between the boreholes that cannot be measured; the precious boreholes can measure fewer liquid parameters; and it is impossible to accurately measure the distribution characteristics of the liquid in the underground void area.

[0040] The above-mentioned technical problems will lead to large measurement workload and low efficiency.

[0041] Therefore, the present invention is based on the above-mentioned problems and provides a method that can reduce the drilling workload (fewer holes) and achieve efficient measurement (multi-parameter) of the liquid properties and distribution characteristics of underground voids.

[0042] By adopting the method of the present invention, the properties of liquids at different locations in the underground void can be identified; the filling slurry parameters (flow rate, concentration, temperature and other parameters) at different locations in the underground void can be measured; and the distribution characteristics of the liquid in the underground void can be obtained.

[0043] like Figure 1 As shown, the measurement system required for the method for measuring the properties and distribution characteristics of liquid in underground voids of the present invention includes:

[0044] Data processing device, centralized control device, connection device and measurement unit.

[0045] Wherein: the data processing device is located on the surface and is used to obtain measurement data and generate instructions for controlling the actions of the measurement unit;

[0046] The centralized control device is fixed at the bottom of the vertical borehole, receives the signal (wired or wireless) from the measuring unit, and assists the measuring unit to move in any direction in the underground empty area;

[0047] The connecting device is used to connect the measuring unit with the centralized control device, transmit motion signals, and can also transmit measurement data, and is also used for the recovery of the measuring unit;

[0048] The measuring unit includes an integrated liquid property sensor, a wireless signal transmitter and a motion mechanism. The integrated liquid property sensor includes sensors for liquid temperature, concentration, conductivity, flow rate, etc. The wireless signal transmitter radiates radio waves to the surrounding space at regular intervals. The function of the radio waves is mainly to enable the centralized control device to receive signals, thereby determining the position of the measuring unit relative to the centralized control device. The measuring data can also be transmitted to the centralized control device in the form of wireless signals without being transmitted through a connecting device. The motion mechanism alone or in cooperation with the centralized control device realizes the spatial movement of the measuring unit in the liquid in the underground empty area.

[0049] Through the functional combination of the above-mentioned data processing device, centralized control device, connection device and measurement unit, the liquid properties and distribution characteristics of a certain range (any position) of underground voids can be measured. It can be applied to the exploration of underground voids and the engineering field of grouting reinforcement.

[0050] The above-mentioned series of actions of the data processing device controlling the measuring unit can be realized by referring to the existing technology.

[0051] The following is a description of a method for measuring the properties and distribution characteristics of liquid in underground voids according to the present invention:

[0052] The first step is to drill holes at the predetermined locations on the ground, only one or a few holes are needed;

[0053] Step 2: Arrange the measurement system required for measurement

[0054] Arrange the data processing device on the ground;

[0055] The centralized control device is fixed at the bottom of the vertical borehole and serves as a position reference to assist the measurement unit in spatial position movement;

[0056] The connecting device is used to connect the measuring unit with the centralized control device;

[0057] The measuring unit completes the measurement of liquid properties at different positions within the measuring range along a certain path in the liquid. The measuring path is as follows: Figure 4 , 5 shown in Figure 5The figure shows the state 0 of the measuring line before the measurement starts, the state 1 of the measuring line rotating from the horizontal direction to the vertical direction with the centralized control device as the center, the state 2 of the measuring points on the measuring line vertically distributed within the liquid height below the centralized control device, and the state 3 of the measuring line rotating from the vertical direction to the horizontal direction with the centralized control device as the center line.

[0058] The data processing device generates movement instructions for controlling the measurement unit and collects the measurement data to obtain the liquid properties and distribution characteristics at different locations in the underground void area.

[0059] 1.1. When using a single measurement unit to measure underground voids containing only water, the following steps are included:

[0060] (1) The initial state measurement unit is located at the top interface of the liquid, such as Figure 4 At point O, the control measurement unit is lowered from the vicinity of the centralized control device to the bottom interface of the liquid, such as Figure 4 In the middle, the measuring unit is controlled to move along the bottom interface in one direction to the rock wall in that direction. If the rock wall is too far away from the centralized control device, the signal sent by the measuring unit to the location may not be received by the centralized control device. In this case, the measuring unit needs to be controlled to the maximum horizontal measuring range, such as Figure 4 Then control the measuring unit to float up to the top interface of the liquid, such as Figure 4 In B1; the control measurement unit returns to the vicinity of the centralized control device, such as Figure 4 At point O, a closed measurement loop is completed in a vertical plane, such as Figure 4 Middle O-O'-A1-B1-O;

[0061] (2) Control the measuring unit to sink to the bottom interface of the liquid, such as Figure 4 After reaching the bottom interface, the measuring unit is controlled to rotate clockwise or counterclockwise for a certain angle. Figure 4 The included angle α between O'A1 and O'A2 moves outward along the bottom interface to the rock wall or the maximum measurement range, as shown in point A2 in the figure; floats up to the top interface of the liquid, as shown in point B2 in the figure; and then returns to the centralized control device, as shown in point B2 in the figure. Figure 4 At point O, continue to complete a measurement closed loop in the vertical plane. Figure 4 Medium O-O'-A2-B2-O;

[0062] (3) Repeat step (2) to complete multiple closed measurement loops around the vertical direction of the centralized control device until Figure 4 Medium O-O'-A n -B n-O. On the measurement path, various parameters of groundwater are obtained through various sensors on the measurement unit. The data processing device calculates the relative position of the measurement unit with respect to the centralized control device according to the time difference of the signals received from the measurement unit by wireless signal receivers at multiple different positions of the centralized control device, and obtains the liquid form in the underground void area;

[0063] 1.2. When measuring underground voids containing only water using a survey line consisting of multiple measurement units, the following steps are included:

[0064] (1) In the initial state, the measuring line is located at the top interface of the liquid along one direction, such as Figure 5 In the state 0 of the measuring line before starting the measurement, the measuring line is controlled to rotate along the vertical plane with the centralized control device as the center, such as Figure 5 In the measurement line state 1, the measurement points on the measurement line are vertically distributed within the liquid height below the centralized control device, such as Figure 5 State 2 of vertical distribution of measuring points on the middle measuring line within the liquid height below the centralized control device;

[0065] (2) After rotating a certain angle with the vertical position as the axis, rotate with the centralized control device as the center in the plane where the survey line is located, such as Figure 5 The middle measuring line is rotated from the vertical direction to the horizontal direction with the centralized control device as the middle line as shown in state 3, to the top interface of the liquid;

[0066] (3) The control measurement line is rotated by a certain angle in the horizontal plane with the centralized control device as the center, and steps (1) and (2) are repeated until the measurement of the entire range is completed; on the measurement path, various parameters of the liquid are obtained through various sensors on the measurement unit, and the data processing device calculates the relative position of the measurement unit with respect to the centralized control device according to the time difference of the signals received from the measurement unit by the wireless signal receivers at multiple different positions of the centralized control device, so as to obtain the liquid form in the underground void area;

[0067] 1.3. When using a single measurement unit to measure the underground void area during grouting construction, the following steps are included:

[0068] If the underground void contains water, a series of measurements of the water-containing underground void must be carried out first. If the underground void does not contain water, it is only necessary to arrange the measurement system in advance in the underground void. During the grouting process, the position of the measurement unit is not restricted. The measurement unit moves with the slurry. After the slurry state is stable, steps (1), (2), and (3) of 1.1 are repeated to complete multiple measurement closed loops around the vertical direction of the centralized control device as the axis. On the measurement path, various parameters of groundwater are obtained through various sensors on the measurement unit. The data processing device calculates the relative position of the measurement unit relative to the centralized control device based on the time difference of the signals received from the measurement unit by the wireless signal receivers at multiple different positions of the centralized control device, and obtains the liquid form in the underground void.

[0069] 1.4. When measuring underground voids in grouting construction using a survey line consisting of multiple measurement units, the following steps are included:

[0070] If the underground void contains water, a series of measurements of the water-containing underground void must be carried out first. If the underground void does not contain water, it is only necessary to arrange the measurement system in the underground void in advance. During the grouting process, the position of the measurement line is not restricted, and the measurement line moves with the slurry. After the slurry state is stable, steps (1), (2), and (3) of 1.2 are repeated to complete the measurement of the liquid properties and distribution characteristics in the entire range. On the measurement path, various parameters of the slurry are obtained through various sensors on the measurement unit. The data processing device calculates the relative position of the measurement unit relative to the centralized control device based on the time difference of the signals received from the measurement unit by the wireless signal receivers at multiple different positions of the centralized control device, and obtains the slurry morphology in the underground void.

[0071] Embodiment 1:

[0072] The measurement process of liquid properties and distribution characteristics in underground voids is as follows: Figure 2 , 3 shown.

[0073] During the exploration of water content in underground voids and grouting reinforcement construction, it is necessary to understand the properties and distribution characteristics of underground liquids in real time to provide technical reference for exploration and grouting construction.

[0074] Parts not described in the present invention can be implemented by referring to the existing technology.

[0075] It should be noted that any equivalent method or obvious variation method made by those skilled in the art under the guidance of this specification should be within the protection scope of the present invention.

Claims

1. A method for measuring the properties and distribution characteristics of liquid in underground voids, characterized in that: The following steps are involved: S1. Drill holes at predetermined locations; S2. Arrange the required measurement system The measuring system comprises a data processing device, a centralized control device, a connecting device and a measuring unit; arranging a data processing device on the surface; The centralized control device is fixed to the bottom of the vertical borehole; The connecting device is used to connect the measuring unit with the centralized control device to transmit motion signals and / or measurement data; The measuring unit includes sensors for various liquid properties, a wireless signal transmitter and a motion mechanism. The sensors include sensors for liquid temperature, concentration, conductivity and flow rate. The wireless signal transmitter transmits radio waves to the surrounding space at regular intervals. The radio waves enable the centralized control device to receive the signal to determine the position of the measuring unit relative to the centralized control device, or transmit the measurement data to the centralized control device in the form of wireless signals. The motion mechanism can move in the liquid in the underground empty area alone or in cooperation with the centralized control device. The centralized control device is used as a position reference and is also used to receive wired or wireless signals from the measurement unit and assist the measurement unit in moving to any position in the underground empty area; The data processing device generates instructions for controlling the movement of the measurement unit, determines the location of the underground empty area where the measurement unit is located, and analyzes the measurement data; S3. When a single measuring unit is used to measure underground voids containing only water, the measuring unit is controlled to measure multiple parameters of the liquid in the underground voids within the maximum measuring range. The measuring path is centered or centered on the location or vertical direction of the centralized control device, and the measurement is performed in two paths: "one circle on the horizontal plane + different depths" or "one circle on the vertical plane + different directions". S4. When measuring underground voids containing only water using a measuring line composed of multiple measuring units, the measuring line is controlled to extend outward from the centralized control device, sweeping the liquid horizontally or vertically in the form of a measuring line, and after rotating a certain angle, continues to sweep the liquid, thereby completing the measurement of the properties and distribution characteristics of the liquid within the measuring range; S5. When a single measuring unit is used to measure the underground void area during grouting construction, if the underground void area contains water, a series of measuring operations of the nature and distribution characteristics of the groundwater must be carried out first. When grouting begins, the measuring unit is placed in a free state and moves with the slurry to measure the flow and diffusion characteristics of the slurry. After the slurry flow stabilizes, the measuring unit is controlled to measure multiple parameters of the liquid in the underground void area within the maximum measuring range. The measuring path is centered or axially at the location or vertical direction of the centralized control device, and the measurement is carried out in two paths: "one circle on the horizontal plane + different depths" or "one circle on the vertical plane + different directions"; S6. When measuring underground voids during grouting construction using a survey line composed of multiple measuring units, if the underground void contains water, a series of measurement operations on the properties and distribution characteristics of the groundwater must be carried out first. When grouting begins, the survey line is in a free state and moves with the slurry to measure the flow and diffusion characteristics of the slurry. After the slurry flow stabilizes, the survey line is controlled to extend outward from the centralized control device and sweep the liquid horizontally or vertically in the form of a survey line. After rotating a certain angle, it continues to sweep the liquid, thereby completing the measurement of the properties and distribution characteristics of the liquid within the measurement range.

2. A method for measuring the properties and distribution characteristics of liquid in underground voids according to claim 1, characterized in that: A single measurement unit can be moved to any position within a certain range of underground voids.

3. A method for measuring the properties and distribution characteristics of liquid in underground void areas according to claim 1, characterized in that: The measuring unit can be directly controlled to measure the liquid at any position within the maximum measuring range.

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