Collapsible loess stratum in-situ test device and method

Abstract

The invention belongs to the technical field of collapsible loess stratum research, and provides a collapsible loess stratum in-situ test device and method.The collapsible loess stratum in-situ test device is characterized in that a plurality of detection rods are arranged on a positioning box, and a plurality of water quantity sensors are arranged on the portions, located outside the positioning box, of the detection rods; the water content detected by each water quantity sensor is converted into a color value through a processor, the water content in different soil layers in a three-dimensional space of the soil and the flowing direction of underground water are obtained through the color values, and dynamic detection of the water content of the soil at different positions is achieved; the water content and the water flow direction of different layer positions in the three-dimensional space of the soil are detected in real time in a simple and visual mode, the diffusion condition and trend of the underground collapsible loess are known in real time, reference such as the position can be provided for foundation stabilization construction measures, and the construction efficiency and safety are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of collapsible loess strata research, and in particular relates to an in-situ test device and method for collapsible loess strata. Background Art

[0002] Collapsible loess is a soil with unique properties, characterized by good soil uniformity, loose structure and abundant pores. When it is not infiltrated by water, it exhibits high mechanical strength and relatively low compressibility. However, once it is infiltrated by water under specific pressure conditions, its soil structure will quickly collapse, resulting in significant additional settlement and a sharp drop in strength. Therefore, when carrying out construction activities in areas involving collapsible loess, it is necessary to study the water content of the loess underground.

[0003] At present, when studying the water content of loess underground, sampling is usually adopted. Even after the loess at the set position is taken out by the sampler, the water content of the taken loess is tested. In this way, if the water content of each position is to be tested, it is necessary to take samples separately and then count the water content of each position to complete the in-situ test. However, the above method can only measure the water content of the soil at each position under static conditions. In actual conditions, the water in the loess is constantly changing. Although the change is sometimes small, it will also affect the test results and the judgment of the construction. Specifically, after the collapsible loess is soaked in water, the water film between the soil particles thickens, and the bonding force of the soil particles is significantly weakened, resulting in the destruction of the soil structure and collapsing. This change will increase the difficulty of construction; at the same time, the water will affect the humidity of the loess around it during the movement, thereby the diffusion trend of the underground collapsible loess. At present, it is not possible to detect and understand the water content and water flow direction of each soil layer in the three-dimensional space of the soil in real time, resulting in the inability to reasonably take construction measures for foundation stability at the appropriate location. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an in-situ test device and method for collapsible loess strata, which converts the moisture content detected by each water sensor into a color value through a processor, and obtains the moisture content in different soil layers and the groundwater flow direction in the three-dimensional soil space through the color value, thereby realizing dynamic detection of soil moisture content at different positions; in a simple and intuitive way, the moisture content and water flow direction of different layers in the three-dimensional soil space are detected in real time, thereby realizing real-time understanding of the diffusion situation and trend of underground collapsible loess, and can provide references such as position for foundation stabilization construction measures to ensure construction efficiency and safety.

[0005] In order to achieve the above-mentioned object, in the first aspect, the present invention provides an in-situ test device for collapsible loess strata, which adopts the following technical scheme:

[0006] An in-situ test device for collapsible loess strata, comprising a positioning box and a plurality of detection rods arranged on the positioning box;

[0007] A portion of the detection rod is located outside the positioning box, and another portion is located inside the positioning box; a portion of the detection rod located outside the positioning box is provided with a plurality of water volume sensors along the axial direction;

[0008] Multiple water sensors are connected to a processor; the processor is used to convert the water content detected by each water sensor into a color value; the water content and groundwater flow direction in different soil layers in the three-dimensional soil space are obtained through the size of the color value and the difference of the color value at different positions.

[0009] Furthermore, the processor is used to obtain the water content detected by each water level sensor; convert the water content detected by each water level sensor into a color value through a set linear calculation method; arrange the points where each water level sensor is located in a three-dimensional space, and cover the color value corresponding to each point on the point to obtain a water volume model; set the time interval, and execute the water volume model establishment content in each time interval in turn to obtain the water volume model corresponding to each time period.

[0010] Furthermore, the flow direction of groundwater is determined according to the difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points; the color difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points is calculated; the direction from the point to the surrounding points is set as the direction of the component vector, and the color difference between the point and the surrounding points is used as the length of the component vector to obtain the component vector corresponding to each surrounding point; each component vector is added to obtain the total vector of the point; the total vectors of each point are added to obtain the water flow vector, and the direction of the water flow vector is obtained as the flow direction of groundwater; the flow direction of groundwater and the total vector of each point are respectively represented by arrows.

[0011] Furthermore, the detection rod is located on a part of the interior of the positioning box, and multiple indicator lights are arranged along the axial direction; the multiple indicator lights are connected to a processor, and the processor is used to receive and process the water content data on multiple water sensors, and convert the water content data into the brightness of the corresponding position indicator lights for control.

[0012] Furthermore, the number of water level sensors and indicator lights on the detection rod is equal, the water level sensor at the highest position is connected to the indicator light signal at the highest position, the second highest water level sensor is connected to the second highest indicator light signal, and so on. The greater the water content detected by the water level sensor, the brighter the brightness of the indicator light at the corresponding position.

[0013] Furthermore, a shading plate is provided on the side of the positioning box away from the water level sensor.

[0014] Furthermore, a mirror grid is arranged inside the positioning box, and each mesh of the mirror grid passes through a detection rod respectively.

[0015] Furthermore, the processor is connected to a display terminal, and the display terminal is used to display water distribution.

[0016] In order to achieve the above-mentioned object, in a second aspect, the present invention further provides an in-situ test method for collapsible loess strata, which adopts the following technical scheme:

[0017] An in-situ test method for collapsible loess strata uses the in-situ test device for collapsible loess strata as described in the first aspect, including: inserting multiple detection rods on the positioning box into the loess stratum, a processor receiving and processing water content data from multiple water sensors, and converting the water content data into the brightness of corresponding position indicator lights for control.

[0018] Furthermore, the ground of the construction site to be tested is cleaned and leveled, and the positioning box is placed on the ground of the construction site to be tested;

[0019] Insert the detection rod into the ground through the through hole so that the water volume sensor is located outside the positioning box and the indicator light is located inside the positioning box;

[0020] Connect the display terminal to the signals of each water level sensor, and then electrically connect the display terminal, each water level sensor and the indicator light to the power supply respectively;

[0021] Through the processor, a water volume model is established according to the positions of each water volume sensor, and the water volume model is displayed.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention arranges a plurality of detection rods on a positioning box, and arranges a plurality of water sensors on the detection rods; the plurality of water sensors are connected to a processor, and the water content detected by each water sensor is converted into a color value through the processor, and the water content in different soil layers and the flow direction of groundwater in the three-dimensional soil space are obtained through the color value, thereby realizing dynamic detection of soil water content at different positions; the water content and the flow direction of different layers in the three-dimensional soil space are detected in real time in a simple and intuitive manner, thereby realizing real-time understanding of the diffusion situation and trend of underground collapsible loess, and providing references such as position for foundation stabilization construction measures, thereby ensuring construction efficiency and safety.

[0024] The present invention uses an array to display the water content of each underground point on the ground in the form of brightness, and uses automatic modeling to count the water content of each point and the direction of water movement, thereby meeting the data supply for the study of underground water content in collapsible loess strata;

[0025] When analyzing and displaying the movement of water levels, the present invention uses color values ​​to represent the water content of each point, and determines the direction of water movement based on the difference in water content between each point. Compared with the traditional laboratory testing method, measurements can be carried out on the construction site, and real-time data can be achieved, which improves the construction progress while ensuring that the inspection results of each laboratory are the same.

[0026] In the present invention, a plurality of detection rods are arranged on the positioning box, the detection rods are located on a part of the outside of the positioning box, a plurality of water sensors are arranged along the axial direction, and a plurality of indicator lights are arranged on a part of the inside of the positioning box, and a processor is connected to the plurality of water sensors and the plurality of indicator lights, and the processor is used to receive and process the water content data on the plurality of water sensors, and convert the water content data into the brightness of the indicator lights at corresponding positions for control; through the plurality of probes on the positioning box, the water content of different positions of the loess can be directly detected, avoiding the problem that the soil water content detection at each position under static action is inconsistent with the actual situation, and the water transfer of the loess at each position can be measured at the same time. At the same time, the water content at each position can be intuitively displayed through the brightness, providing a fast and accurate judgment basis for construction, and ensuring the efficiency and safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0028] Figure 1 This is a schematic diagram of the overall structure of the device of Example 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the positioning box structure of Example 1 of the present invention;

[0030] Figure 3 It is a cross-sectional schematic diagram of the transverse structure of the connection between the interior of the positioning box and the mirror grid in Example 1 of the present invention;

[0031] Figure 4 This is a flow chart of the test method of Example 1 of the present invention;

[0032] Among them: 1. detection rod; 2. water level sensor; 3. indicator light; 4. sunshade; 5. positioning box; 6. processor; 7. display terminal; 8. through hole; 9. mirror grid. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] Embodiment 1:

[0036] like Figure 1 As shown, the present embodiment provides an in-situ test device for collapsible loess strata, which displays the water content of each underground point on the ground in the form of brightness through an array, and counts the water content of each point and the direction of water movement through automatic modeling, so as to meet the data supply for the study of underground water content in collapsible loess strata; the device includes a positioning box 5, and the upper and lower surfaces of the positioning box 5 are respectively provided with a plurality of through holes 8, and the number of through holes 8 on the upper and lower surfaces is equal and corresponds one to one on the same longitudinal straight line, that is, the corresponding two through holes 8 are coaxially arranged; the through hole 8 passes through a detection rod 1, and the lower end of the detection rod 1 is respectively provided with a plurality of water volume sensors 2 along its length direction, and the water volume sensors 2 are located on the outside of the positioning box 5, and the upper end of the detection rod 1 is respectively provided with a plurality of indicator lights 3 along its length direction, and the indicator lights 3 are located on the inner side of the positioning box 5, and the indicator lights 3 are connected to the water volume sensor 2 through a processor 6, and the indicator lights 3 and the water volume sensor 2 are respectively electrically connected to a power supply.

[0037] During construction, the ground of the construction site to be tested is cleaned and leveled, and the positioning box 5 is placed on the ground of the construction site to be tested to ensure that the positioning box 5 is placed stably. The function of the positioning box 5 is to ensure the vertical direction of each detection rod 1 when inserted into the ground. Then the detection rod 1 is inserted into the ground through the through hole 8, so that the water level sensor 2 is located on the outside of the positioning box 5, and the indicator light 3 is located on the inside of the positioning box 5. The display terminal 7 is connected to the signals of each water level sensor 2, and then the display terminal 7 and each water level sensor 2 and the indicator light 3 are electrically connected to the power supply respectively. In this way, the water content of the loess at various underground locations can be obtained by observing the position and brightness of the indicator light 3.

[0038] In this embodiment, when the water level sensor 2 and the indicator light 3 are connected by signal, the water level sensor 2 and the indicator light 3 are connected in sequence from top to bottom to transmit signals. The greater the water content detected by the water level sensor 2, the brighter the brightness of the indicator light 3. In other words, the number of water level sensors 2 and indicator lights 3 is equal, the highest water level sensor 2 is connected by signal to the highest indicator light 3, the second highest water level sensor 2 is connected by signal to the second highest indicator light 3, and so on, so that each water level sensor 2 is connected by signal to the corresponding indicator light 3, and the circuit is set so that the greater the water content detected by the water level sensor 2, the brighter the brightness of the indicator light 3.

[0039] Therefore, in this embodiment, the underground water content of the collapsible loess stratum is transferred to the ground, which makes it easy to observe the underground water content, and provides a direct source of data on the underground water content of the collapsible loess stratum at the construction site. The underground water content of the collapsible loess stratum can be studied at the construction site without the need for a complicated sampling process and without destroying the structure of the collapsible loess stratum.

[0040] In order to facilitate observation of the indicator lights 3 in the positioning box 5 at the construction site and better observe the brightness of each indicator light 3 , a shading plate 4 is provided on the top of the positioning box 5 in this embodiment.

[0041] In addition, in this embodiment, the positioning box 5 is provided with a mirror grid 9, and each mesh of the mirror grid 9 passes through one of the detection rods 1. In this way, when observing, due to the effect of the mirror grid 9, the intensity of the indicator light 3 illuminating the mesh will be enhanced, that is, it will be easier to observe.

[0042] Specifically, at the construction site, combined with the shading plate 4 above, the staff can clearly see the brightness of each grid above the positioning box 5 with the help of the shading plate 4, so as to judge the water content of each longitudinal depth under the loess. The greater the water content, the brighter the grid.

[0043] In this embodiment, in order to further study the underground water content, a display terminal 7 connected to the processor 6 is also included. The display terminal 7 is connected to the water volume sensor 2 signal through the processor 6, and the display terminal 7 is electrically connected to the power supply. The display terminal 7 is used to display the water volume model generated by the processor 6. In this embodiment, the processor 6 processes the collected data to generate a water volume model, which is displayed through the display terminal 7, and the water content of each point underground can be intuitively shown, as well as further research on the water content, that is, the movement of water volume reflected by the change of water content over time.

[0044] Therefore, based on the above-mentioned in-situ test device for collapsible loess strata, this embodiment uses the device to conduct in-situ tests at the construction site. This embodiment also proposes an in-situ test method for collapsible loess strata, such as Figure 4 As shown, the following steps are included:

[0045] S1, clean and level the construction site to be tested, and place the positioning box 5 on the construction site to be tested;

[0046] S2, insert the detection rod 1 into the ground through the through hole 8, so that the water sensor 2 is located outside the positioning box 5 and the indicator light 3 is located inside the positioning box 5;

[0047] S3, connecting the processor 6 to the signals of each water level sensor 2, and then electrically connecting the processor 6, each water level sensor 2 and the indicator light 3 to the power supply respectively;

[0048] S4. The processor 6 establishes a water volume model according to the positions of the water volume sensors 2 , and displays the water volume model through the display terminal 7 .

[0049] Specifically, in step S4 of this embodiment, the processor 6 establishes a water volume model according to the position of each water volume sensor 2, including the following steps:

[0050] S401, the processor 6 obtains the water content detected by each water sensor 2;

[0051] S402, the processor 6 converts the water content detected by each water sensor 2 into a color value through a set linear calculation method;

[0052] S403, the processor 6 arranges the points where the water volume sensors 2 are located in the three-dimensional space, and covers the color values ​​corresponding to the points on the points to obtain a water volume model;

[0053] S404, the processor 6 sets a time interval, and executes steps S401 to S403 in sequence in each time interval to obtain a water volume model corresponding to each time period.

[0054] In this embodiment, the water content value obtained by the water level sensor 2 is converted into an intuitive color value, so that the staff can directly obtain the water content from the model by observing the depth of color, realizing the digital intuitive conversion, which is convenient for the staff to carry out further work. At the same time, the water volume model in this embodiment supports the observation of its internal cross-sectional surface, which can also facilitate the staff to obtain and study the data. In this embodiment, there is a water volume model for each time period, and each time period is saved in the database respectively. The setting time interval of step S404 is the time period. For example, the time interval is one hour, even if there is a water volume model for every hour.

[0055] In addition, after step S404, the method further includes:

[0056] S405: The processor 6 determines the flow direction of groundwater according to the difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points.

[0057] The flow direction of groundwater is obtained by processing the water levels of each point in adjacent time periods. Specifically, step S405 includes:

[0058] Step 4051: the processor 6 calculates the color difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points;

[0059] Step 4052: the processor 6 sets the direction from the point to its surrounding points as the direction of the component vector, and uses the color difference between the point and its surrounding points as the length of the component vector, to obtain the component vector corresponding to each surrounding point;

[0060] Step 4053: the processor 6 adds up the component vectors to obtain the total vector of the point;

[0061] Step 4054: the processor 6 adds up the total vectors of each point to obtain a water flow vector, and the direction of the water flow vector is obtained as the flow direction of the groundwater.

[0062] In step 4051, each point is regarded as the central point, and the points in a circle around the central point are the surrounding points. There is one central point and eight surrounding points, and the vectors between each surrounding point and the central point are different. The vectors between each surrounding point and the central point are the component vectors. The final total vector is one corresponding to each point and the central point, and the water flow vector is one corresponding to all the points.

[0063] In this way, this embodiment shows the water level movement through vectors and colors, and gives the amount of water moved and displays it to facilitate the research of the staff. This embodiment also performs preliminary processing on the acquired data to reduce the work of the staff and improve the efficiency of the construction.

[0064] In addition, after step 4054, the present invention further includes:

[0065] Step S4055: The processor 6 represents the flow direction of groundwater and the total vector of each point using arrows.

[0066] The arrows can intuitively show the direction of water flow.

[0067] In addition, in step S403, this embodiment further includes: extracting the surface of the water volume model and highlighting the surface of the water volume model. Since the surface of the water volume model represents the boundary of the water content, highlighting can help the staff quickly locate the situation and position of the underground water content.

[0068] Embodiment 2:

[0069] The present embodiment provides an in-situ test method for collapsible loess strata, using the in-situ test device for collapsible loess strata as described in Example 1, including: inserting multiple detection rods 1 on the positioning box 5 into the loess stratum, the processor 6 receiving and processing the moisture content data on the multiple water sensors 2, and converting the moisture content data into the brightness of the corresponding position indicator light 3 for control.

[0070] Optionally, the ground of the construction site to be tested is cleaned and leveled, and the positioning box 5 is placed on the ground of the construction site to be tested; the detection rod 1 is inserted into the ground through the through hole, so that the water level sensor 2 is located on the outside of the positioning box 5 and the indicator light 3 is located on the inside of the positioning box 5; the display terminal 7 is connected to the signals of each water level sensor 2, and then the display terminal 7 and each water level sensor 2 and the indicator light 3 are electrically connected to the power supply respectively; through the processor 6, a water volume model is established according to the position of each water volume sensor 2, and the water volume model is displayed.

[0071] Optionally, when establishing a water volume model: obtain the water content detected by each water volume sensor 2; convert the water content detected by each water volume sensor 2 into a color value through a set linear calculation method; arrange the points where each water volume sensor 2 is located in a three-dimensional space, and cover the color value corresponding to each point on the point to obtain a water volume model; set a time interval, and execute the water volume model establishment content in each time interval in turn to obtain a water volume model corresponding to each time period.

[0072] Optionally, the flow direction of groundwater is determined based on the difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points; the color difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points is calculated; the direction from the point to the surrounding points is set as the direction of the component vector, and the color difference between the point and the surrounding points is used as the length of the component vector to obtain the component vectors corresponding to each surrounding point; each component vector is added up to obtain the total vector of the point; the total vectors of each point are added up to obtain a water flow vector, and the direction of the water flow vector is obtained as the flow direction of groundwater.

[0073] Optionally, the groundwater flow direction and the total vector of each point are represented by arrows.

[0074] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. An in-situ test device for collapsible loess strata, characterized in that: It comprises a positioning box and a plurality of detection rods arranged on the positioning box; A portion of the detection rod is located outside the positioning box, and another portion is located inside the positioning box; The detection rod is located on a part of the outside of the positioning box, and a plurality of water volume sensors are arranged along the axial direction; Multiple water sensors are connected to a processor; the processor is used to convert the water content detected by each water sensor into a color value; the water content and groundwater flow direction in different soil layers in the three-dimensional soil space are obtained through the size of the color value and the difference of the color value at different positions.

2. The in-situ test device for collapsible loess strata according to claim 1, characterized in that: The processor is used to obtain the water content detected by each water sensor; convert the water content detected by each water sensor into a color value through a set linear calculation method; arrange the points where each water sensor is located in a three-dimensional space, and cover the color value corresponding to each point on the point to obtain a water volume model; set a time interval, and execute the water volume model establishment content in each time interval in turn to obtain a water volume model corresponding to each time period.

3. The in-situ test device for collapsible loess strata according to claim 2, characterized in that: The flow direction of groundwater is determined based on the difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points; the color difference between the color value corresponding to each point and the color values ​​corresponding to the surrounding points is calculated; the direction from the point to the surrounding points is set as the direction of the component vector, and the color difference between the point and the surrounding points is used as the length of the component vector to obtain the component vectors corresponding to each surrounding point; each component vector is added to obtain the total vector of the point; the total vectors of each point are added to obtain the water flow vector, and the direction of the water flow vector is obtained as the flow direction of groundwater; the flow direction of groundwater and the total vector of each point are represented by arrows respectively.

4. The in-situ test device for collapsible loess strata according to claim 1, characterized in that: The detection rod is located on a part of the interior of the positioning box, and multiple indicator lights are arranged along the axial direction; the multiple indicator lights are connected to a processor, and the processor is used to receive and process water content data from multiple water sensors, and convert the water content data into the brightness of the corresponding position indicator lights for control.

5. The in-situ test device for collapsible loess strata according to claim 1, characterized in that: The number of water level sensors and indicator lights on the detection rod is equal. The water level sensor at the highest position is connected to the indicator light signal at the highest position, the second highest water level sensor is connected to the second highest indicator light signal, and so on. The greater the water content detected by the water level sensor, the brighter the brightness of the indicator light at the corresponding position.

6. The in-situ test device for collapsible loess strata according to claim 1, characterized in that: A shading plate is arranged on the side of the positioning box away from the water volume sensor.

7. The in-situ test device for collapsible loess strata according to claim 1, characterized in that: A mirror grid is arranged inside the positioning box, and each mesh of the mirror grid passes through a detection rod respectively.

8. The in-situ test device for collapsible loess strata according to claim 1, characterized in that: The processor is connected to a display terminal, and the display terminal is used to display the water volume distribution.

9. An in-situ test method for collapsible loess strata, characterized in that: An in-situ test device for collapsible loess strata as described in any one of claims 1 to 8 is used, comprising: inserting multiple detection rods on the positioning box into the loess stratum, a processor receiving and processing moisture content data from multiple water sensors, and converting the moisture content data into the brightness of corresponding position indicator lights for control.

10. The in-situ test method for collapsible loess strata according to claim 9, characterized in that: Clean and level the construction site to be tested, and place the positioning box on the construction site to be tested; Insert the detection rod into the ground through the through hole so that the water volume sensor is located outside the positioning box and the indicator light is located inside the positioning box; Connect the display terminal to the signals of each water level sensor, and then electrically connect the display terminal, each water level sensor and the indicator light to the power supply respectively; Through the processor, a water volume model is established according to the positions of each water volume sensor, and the water volume model is displayed.

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