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Soil evaporation capacity monitoring method in cracked coal mining subsidence area

A technology of soil evaporation and coal mining subsidence area, which is applied in the direction of soil material testing, material inspection, etc., can solve the problems of accelerated soil water loss, different shapes, and increased evaporation area

Active Publication Date: 2014-12-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies have shown that the cracks produced by mining subsidence have a significant impact on the study of water evaporation in this area due to the length, width and shape of the cracks, which increase the evaporation area, reduce the soil water storage capacity, and accelerate Soil water loss directly affects plant growth and water resource utilization in mining areas

Method used

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  • Soil evaporation capacity monitoring method in cracked coal mining subsidence area
  • Soil evaporation capacity monitoring method in cracked coal mining subsidence area
  • Soil evaporation capacity monitoring method in cracked coal mining subsidence area

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1 is aimed at the bare land without plants on the ground, and the crack 100 is a single crack. exist figure 1 In the diagram, broken lines are used to represent the segmentation of the crack 100. For the sake of simplicity in the drawing, only the narrow crack segment 11, the wide crack segment 12 and the middle crack segment 13 are selected, and each segment is marked. figure 1 The straight line perpendicular to the direction of the fracture is the straight line used to set the monitoring point, and the small circle in it represents the monitoring point, and the micro-evaporator is set at this position. It should be noted that since cracks are generally irregular, vertical here refers to a direction roughly perpendicular to the crack at the selected monitoring point.

[0022] like figure 1 As shown, embodiment one of the present invention has the coal mining subsidence area soil evaporation monitoring method of crack, comprises the steps:

[0023] (1) Div...

Embodiment 2

[0036] figure 2 It is a schematic diagram of the arrangement of monitoring points in Embodiment 2 of the present invention, figure 2 Monitoring points are omitted in . like figure 2 As shown, the difference between the second embodiment and the first embodiment is that the crack 200 bifurcates and is divided into a first crack 201 and a second crack 202. The setting method of the monitoring points on the first crack 201 and the second crack 202 is also the same as that of the first embodiment. However, since the first crack 201 and the second crack 202 are opposite, the monitoring points between the two are set opposite to each other, and finally meet at the center line of the two, that is, figure 2 near the dotted line in .

[0037] In addition, due to the existence of forks, such as figure 2 As shown in , monitoring points are also set at the bifurcation of cracks. That is, the intersections of the slit 200, the first slit 201 and the second slit 202 are set. The...

Embodiment 3

[0039] image 3 It is a schematic diagram of the arrangement of monitoring points in Embodiment 3 of the present invention (when cracks pass through the projected area). like image 3 As shown, in the third embodiment, the crack 300 passes through the projected area of ​​the plant, in image 3 In the figure, for the sake of brevity, no plants are shown, only the shadow 91 of the trunk and the shadow 92 of the crown are shown, and the crack 300 passes through the shadow 92 of the crown. Considering the influence of plants on evaporation, when selecting monitoring points, a monitoring point is added at a section where the crack 300 passes through the projection area. The projection area of ​​plants refers to the union of the shadow areas of plants in one day. The distance and number of monitoring points are the same as those of the no-shade area, but a column of monitoring points is added in the projection area to reflect the interaction of plant cracks. Dynamic influence of ...

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Abstract

The invention discloses a soil evaporation capacity monitoring method in a cracked coal mining subsidence area. The method comprises the following steps: (1) according to the width of each crack, segmenting the crack into a narrow crack section, a wide crack section and an intermediate crack section; (2) selecting monitoring points in the length direction of the crack: respectively selecting the monitoring points at the narrow crack section and the wide crack section, and selecting each monitoring point according to a length of 2-5 m or the length of 5-10 m at the intermediate crack section; (3) respectively and symmetrically allocating a plurality of monitoring points at two sides of the crack, configuring micro-evaporators for each monitoring point; (4) calculating the evaporation capacity: every scheduled time, measuring the evaporation capacity, and dynamically reflecting the influence of crack development on the soil evaporation capacity. The configuration manner of the monitoring points in the invention is suitable for monitoring of the soil evaporation capacity in the western arid and semi-arid subsidence area; the method can be used for specifically monitoring influence of the cracks with different length, width and shapes on the soil evaporation capacity.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a method for monitoring soil evaporation in cracked coal mining subsidence areas. Background technique [0002] Coal is the conventional energy with the largest reserves and the widest distribution in the world, and it is also the cheapest energy. As the world's largest coal-producing country, my country's coal production accounts for 37% of the world's total coal production. With the large-scale mining of coal, the damage to the ecological environment caused by coal mining has become more and more prominent. Among them, coal mining subsidence has attracted more and more attention as one of them. After the minerals are mined, the original stress of the rock mass around the mining area is redistributed, the original equilibrium state is destroyed, and a new equilibrium state is formed. During this process, continuous movement, deformation and discontinuous dama...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 毕银丽邹慧李少朋
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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