CN111398185A - Simulation collapse area crack preferential flow survey system based on tracer technique - Google Patents

Abstract

The invention discloses a system for measuring the preferential flow of cracks in simulated collapse area based on tracer technology, comprising an infiltration and dyeing tracer module, a picture acquisition module, a picture processing module, a data processing module and a preferential flow measurement module. The tracer module is used to perform infiltration tests on the simulated collapse area using a double-ring infiltrator and dyed tracers. Image processing is performed on the fracture profile pictures in the collapse area, the dye distribution map of the transverse and longitudinal sections is drawn, and the data processing module analyzes the preferential flow form; the system of the present invention simulates the fractures in the collapse area by using the tracking technology of the ring infiltrator and the dyed tracer. The preferential flow measurement can quickly and easily obtain the distribution characteristics of the preferential flow on the soil profile. Based on the non-equilibrium characteristics and complex fractal characteristics of the preferential flow in the simulated collapse area, the preferential flow measurement is more scientific.

Description

A system for determining the preferential flow of fractures in simulated collapse areas based on tracer technology

technical field

The invention relates to the field of groundwater engineering, in particular to a system for determining the preferential flow of cracks in simulated collapse areas based on tracer technology.

Background technique

Preferential flow is a common form of soil water transport, and it is a symbol of soil water movement mechanism research from homogeneous to heterogeneous field. It is used to describe the non-equilibrium flow process that occurs under various environmental conditions. The existence of preferential flow makes water mainly affected by gravity and the preferential path quickly flows through the upper soil and rarely interacts with the surrounding sudden matrix, so that water and solutes can quickly reach the deep soil through preferential paths, increasing the threat of groundwater pollution and affecting surface runoff. production. Soil erosion and deep groundwater reserves have a greater impact and play an important role in the hydrological process of the basin.

At present, the measurement system for the preferential flow of fractures in the collapse area is not perfect, the system cannot accurately judge and analyze the type of preferential flow, and is affected by the non-equilibrium characteristics and complex fractal characteristics of fracture preferential flow, which are difficult to quantify, resulting in collapse. The measurement result of the preferential flow of the fracture in the area is not accurate enough. Therefore, the present invention proposes a system for determining the preferential flow of the fracture in the simulated collapse area based on the tracer technology, so as to solve the deficiencies in the prior art.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a system for determining the preferential flow of fractures in simulated collapse areas based on tracer technology. The distribution characteristics of the preferential flow on the soil profile can be quickly and easily obtained, and the preferential flow measurement is carried out based on the non-equilibrium characteristics and complex fractal characteristics of the preferential flow in the simulated collapse area, and the measurement results are more scientific.

For realizing the purpose of the present invention, the present invention realizes through the following technical solutions:

A system for determining the preferential flow of cracks in a simulated collapse area based on tracer technology, comprising an infiltration and dye tracing module, a picture acquisition module, a picture processing module, a data processing module and a preferential flow measurement module, the infiltration and dye tracing module The module is used to carry out the infiltration test on the simulated collapse area by using the double-ring infiltrator and the dyed tracer to obtain the height of the infiltration liquid and the volume of the outflow liquid. The picture acquisition module is used to collect the simulated collapse after dyeing and tracing. The picture processing module is used to perform image processing on the picture of the fracture profile in the simulated collapse area, and draws a horizontal and vertical section dye distribution map with scale, and the data processing module is used for drawing the picture processing module. The scaled transverse and longitudinal section dye distribution map is analyzed, and the preferential flow form is analyzed according to the dyeing result, and the preferential flow determination module determines the unbalanced characteristics and The complex fractal characteristics are then determined, and then it is determined whether the fracture preferential flow in the simulated collapse area is the natural state collapse preferential flow or the fracture preferential flow in the collapse area under human engineering.

A further improvement is that: when the infiltration and dyeing tracer module is used to perform infiltration tests on the simulated collapsed area by using a double-ring infiltration instrument and dyeing tracer, the dyeing tracer adopts a bright blue dye with a concentration of 4g/l. , After the infiltration test, the soil needs to be covered with a plastic sheet, and a gap of 5 cm is maintained between the plastic sheet and the soil surface to ensure the free flow of air.

A further improvement is that: when the picture acquisition module collects the pictures of the fracture profile in the simulated collapse area, the soil after the infiltration test for 24 hours is excavated first, and then the camera is used to collect the profile picture and save the profile picture.

A further improvement is that: when the picture acquisition module is excavating the profile, it is necessary to excavate the longitudinal section and the transverse section, and when the longitudinal section and the transverse section are excavated, a photo recording is performed every 1 cm, until the sudden longitudinal section and transverse section are dyed. disappear.

A further improvement is that: when the image processing module performs image processing, it firstly performs cropping and correction on the collected profile picture, then adjusts the color of the profile picture, filters out the unstained part, retains only the stained part, and compares the longitudinal section and the transverse section. The stained area of is further classified according to different staining colors, and is divided into two grades: dark blue and light blue.

A further improvement is that: when the picture processing module draws the dye distribution map of the horizontal and vertical sections with scales, the actual dyed area on the section picture is first converted into the dyeing percentage of the entire section picture area, and the height of the infiltrated liquid surface is calculated. And the effluent volume was converted into infiltration rate, outflow rate, cumulative infiltration volume and cumulative outflow flow, and then according to the dyeing percentage, infiltration rate, outflow rate, cumulative infiltration volume and cumulative outflow flow, using SIgma-Plot10 .0 software draws a scaled cross- and vertical-section dye distribution map.

A further improvement is that: when the priority flow determination module determines the non-equilibrium characteristics and complex fractal characteristics of the fracture preferential flow in the simulated collapse area, it is necessary to determine the length, width, depth, and nodes of the fracture preferential flow in the non-equilibrium characteristics and complex fractal characteristics. The number of blocks, the number of blocks, the distribution of the intersection angles, the spread of blocks, and the mean curvature were determined.

A further improvement is that: the surface cracks of the soil determined by the preferential flow measurement module are network-shaped and staggered and have anisotropic cracks, multiple staggered sub-cracks are distributed on both sides of the crack, micro-cracks, cracks are in a nearly parallel distribution state, or cracks are in a state of nearly parallel distribution. If there are any two or more states in the strip shape, the fracture preferential flow in the simulated collapse area is the natural state of the fracture preferential flow in the collapse area.

A further improvement is that: the surface cracks of the soil determined by the preferential flow measurement module are large single cracks and a plurality of small cracks in stripes are distributed on both sides of the cracks or the crack edges are nearly parallel and distributed in stripes. Any one or If there are two states, the fracture preferential flow in the simulated collapse area is the fracture preferential flow in the collapse area under human engineering.

The beneficial effects of the invention are as follows: the system of the invention can quickly and conveniently obtain the distribution characteristics of the preferential flow on the soil profile by using the ring infiltrator and the tracer technology of dyed tracers to measure the preferential flow of the cracks in the simulated collapse area. It is of great significance to determine the type of preferential flow. Based on the non-equilibrium characteristics and complex fractal characteristics of the preferential flow in the simulated collapse area, the measurement results are more scientific and the measurement results are more stable.

Description of drawings

FIG. 1 is a schematic diagram of the system framework of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 , this embodiment proposes a system for determining the preferential flow of fractures in simulated collapse areas based on tracer technology, including an infiltration and staining tracer module, a picture acquisition module, a picture processing module, a data processing module, and a preferential flow measurement module. module;

The infiltration and dyeing tracer module is used to perform infiltration test on the simulated collapse area by using the double-ring infiltrator and dyeing tracer to obtain the height of the infiltration liquid level and the volume of the outflow liquid. When the tracer conducts the infiltration test on the simulated collapse area, the dye tracer adopts a bright blue dye with a concentration of 4.0kg/ ^cm3 . After the infiltration test, the soil needs to be covered with plastic sheeting, and the plastic sheeting and soil There is a 5cm gap between the surfaces to ensure free flow of air;

The picture acquisition module is used to collect the picture of the crack profile of the simulated collapse area after dyeing and tracing. First, the soil 24 hours after the infiltration test is carried out to excavate the profile. When excavating the profile, it is necessary to excavate the longitudinal section and the transverse section. , and take pictures every 1cm when excavating the longitudinal section and transverse section, until the sudden longitudinal section and transverse section dyeing disappears, and then use the camera to collect the section picture and save the section picture;

The image processing module is used to perform image processing on the fracture profile pictures in the simulated collapse area. First, the collected profile pictures are cropped and corrected, and then the color of the profile pictures is adjusted to filter out the unstained parts, retain only the dyed parts, and make vertical The stained areas of the section and cross section are further classified according to different staining colors, and are divided into two grades: dark blue and light blue, and then the actual stained area on the section picture is converted into the dyeing percentage of the entire section picture area, and the infiltrated liquid is added. The surface height and outflow volume were converted into infiltration rate, outflow rate, cumulative infiltration amount and cumulative outflow rate, and then according to the dyeing percentage, infiltration rate, outflow rate, cumulative infiltration amount and cumulative outflow rate, using SIgma -Plot10.0 software draws a scaled cross-sectional dye distribution map;

The data processing module is used for analyzing the horizontal and vertical section dye distribution diagrams with scale drawn by the picture processing module, and analyzing the preferential flow form according to the dyeing results;

The priority flow determination module determines the non-equilibrium characteristics and complex fractal characteristics of the fracture preferential flow in the simulated collapse area according to the preferential flow form analyzed by the data processing module. Width, depth, number of nodes, number of blocks, intersection angle distribution, block dispersion and average tortuosity are measured, and then determine whether the preferential flow of cracks in the simulated collapse area is the natural state collapse area preferential flow or the collapse area under human engineering. Fracture preferential flow, when it is determined that the surface cracks of the soil are network-like staggered and anisotropic cracks, multiple staggered sub-cracks are distributed on both sides of the crack, micro-cracks, the cracks are nearly parallel, or the cracks are in strips. Any two or more states, the simulated preferential flow of cracks in the collapse area is the natural state of preferential flow of cracks in the collapsed area; when the surface cracks of the soil are determined to be large single cracks and there are many small cracks or cracks in the shape of strips distributed on both sides of the cracks. If the fracture edges are nearly parallel and distributed in either one or two states of strips, the simulated fracture preferential flow in the collapse area is the fracture preferential flow in the collapse area under human engineering.

The system of the invention can quickly and conveniently obtain the distribution characteristics of the preferential flow on the soil profile by using the tracer technology of the ring infiltrator and the dyed tracer to measure the preferential flow of the cracks in the simulated collapse area, so as to determine the type of the preferential flow. It is of great significance. Based on the non-equilibrium characteristics and complex fractal characteristics of the simulated fracture preferential flow in the collapse area, the measurement results are more scientific and the measurement results are more stable.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. a kind of simulation collapse zone crack priority flow measurement system based on tracer technology, it is characterized in that: comprise infiltration and dye tracer module, picture acquisition module, picture processing module, data processing module and priority flow measurement module, described The infiltration and dyeing tracer module is used to perform infiltration tests on the simulated collapse area by using a double-ring infiltrator and dyed tracers to obtain the infiltration liquid level and outflow liquid volume. The picture acquisition module is used to collect dyed and dyed liquid. The traced fracture profile picture of the simulated collapse area, the image processing module is used to perform image processing on the fracture profile picture of the simulated collapse area, and draw a scaled transverse and longitudinal section dye distribution map, and the data processing module is used to The image processing module draws a scaled horizontal and vertical section dye distribution map for analysis, and analyzes the preferential flow form according to the dyeing results. The preferential flow determination module determines that the cracks in the simulated collapse area are prioritized according to the preferential flow form analyzed by the data processing module. The non-equilibrium characteristics and complex fractal characteristics of the flow are determined, and then it is determined whether the fracture preferential flow in the simulated collapse area is the fracture preferential flow in the natural collapse area or the fracture preferential flow in the collapse area under human engineering. 2 . The system for determining the preferential flow of cracks in simulated collapse zones based on tracer technology according to claim 1 , wherein the infiltration and dye tracer module is used to utilize a double-ring infiltrator and dye tracer. 3 . When the infiltration test is carried out on the simulated subsidence area, the dye tracer uses a bright blue dye with a concentration of 4g/l. After the infiltration test is completed, the soil needs to be covered with a plastic sheet, and there is a gap between the plastic sheet and the soil surface. A 5cm gap is used to ensure free flow of air. 3. A system for determining the preferential flow of cracks in a simulated collapse area based on tracer technology according to claim 1, wherein: when the picture acquisition module collects a picture of the crack section in the simulated collapse area, an infiltration test will be carried out at first 24 . After 1 hour, the soil was excavated and profiled, and then a camera was used to collect the profile pictures and save the profile pictures. 4. The system for determining the preferential flow of cracks in a simulated collapse zone based on a tracer technology according to claim 3, wherein: when the picture acquisition module performs the excavation profile, it is necessary to excavate a longitudinal section and a transverse section, and When excavating the longitudinal and transverse sections, take pictures and record every 1 cm until the sudden staining of the longitudinal and transverse sections disappears. 5 . A system for determining the preferential flow of cracks in simulated collapse areas based on tracer technology according to claim 4 , wherein: when the image processing module performs image processing, firstly, the collected profile pictures are cropped and corrected, and then 5 . Adjust the color of the section image, filter out the unstained part, keep only the dyed part, and further classify the dyed area of the longitudinal section and the cross section according to different dyeing colors, and divide them into two levels: dark blue and light blue. 6. A system for determining the preferential flow of cracks in a simulated collapse zone based on tracer technology according to claim 1, characterized in that: when the picture processing module draws a scaled transverse and longitudinal section dye distribution map, first The actual dyed area on the profile picture is converted to the dye percentage of the entire profile picture area, and the infiltration liquid level and the outflow liquid volume are converted into infiltration rate, outflow rate, cumulative infiltration and cumulative outflow, and then According to the dyeing percentage, infiltration rate, outflow rate, cumulative infiltration and cumulative outflow, the SIgma-Plot10.0 software was used to draw a scaled cross-sectional dye distribution map. 7. A system for determining the preferential flow of a simulated collapse zone fracture based on a tracer technology according to claim 1, wherein the priority flow measurement module is based on judging the non-equilibrium characteristics and complex fractals of the simulated collapse zone fracture preferential flow The length, width, depth, number of nodes, number of blocks, intersection angle distribution, block dispersion and average tortuosity of fracture preferential flow in non-equilibrium features and complex fractal features need to be measured. 8 . The system for determining the preferential flow of cracks in simulated collapse areas based on the tracer technology according to claim 1 , wherein the surface cracks of the soil measured by the preferential flow measurement module are distributed in a network and have anisotropy. 9 . If there are any two or more of the cracks, there are multiple staggered minor cracks, micro-cracks on both sides of the crack, the cracks are almost parallel, or the cracks are in stripes, the preferential flow of the cracks in the simulated collapse area is the natural collapse. Fractures flow preferentially in the area. 9 . The system for determining the preferential flow of cracks in simulated collapse areas based on tracer technology according to claim 1 , wherein the surface cracks of the soil determined by the preferential flow determination module are large single cracks with many distributions on both sides of the cracks. 10 . If the small cracks in the shape of strips or the crack edges are nearly parallel and distributed in either or both of the states of stripes, the fracture preferential flow in the simulated collapse area is the fracture preferential flow in the collapse area under human engineering.

Images