Deep karst leakage passage detection structure and method based on drill rod inner pipe water level

A detection method and water level technology, applied in earthwork drilling, wellbore/well components, buildings, etc., can solve problems such as the difficulty in establishing a seepage field model, and achieve the effect of flexible and simple observation methods and easy-to-master analysis methods

Active Publication Date: 2017-02-22
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The groundwater head is different at different locations and elevations underground. Due to the effect of layered water level and water head changes in the geological body, during the drilling process, there will be vertical flow and horizontal flow in the water body in the hole, that is, the water body in the hole will mix. , the water level will be gradually balanced, and the comprehensive water level of the borehole cannot reflect the actual water head at a certain depth underground, so it is difficult to establish a seepage field model at different depths in the entire exploration line profile

Method used

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  • Deep karst leakage passage detection structure and method based on drill rod inner pipe water level
  • Deep karst leakage passage detection structure and method based on drill rod inner pipe water level
  • Deep karst leakage passage detection structure and method based on drill rod inner pipe water level

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Effect test

Embodiment 1

[0079] A reservoir in Chongqing is located in a karst area. During the leak investigation process, the water level observation of the inner pipe during the drilling process of borehole 5 was carried out. The observation data of borehole ZKJ2 are typical, see Figure 5 , because in general, the water level in the seepage area will drop sharply, so the abscissa in the figure takes the water level decrease as the positive direction. The interval between 1130m and 1070m in the figure is the possible leakage area, with a buried depth of more than 100 meters.

[0080] Graphical analysis is carried out through the inner pipe water level 8 of the anti-seepage section, see Image 6 shown.

Embodiment 2

[0082] 20 boreholes 5 were completed in the grouting flat tunnel on the left bank of a hydropower station in a strongly karst-developed area in Guizhou, with a maximum depth of 270m. During the drilling process, the inner pipe water level 8 was measured for each borehole 5 in sections. Select the inner pipe water level 8 when the reservoir water level is relatively high to compile the water head equipotential line diagram on the anti-seepage section. For local abnormal areas, see Figure 7 , the seepage channel 4 is buried more than 300 meters below the surface.

[0083] The figure clearly reflects the seepage characteristics on the section:

[0084] (1) Due to the strong development of karst and its extreme inhomogeneity, the water level 8 of the pipes in each borehole 5 varies greatly, and the equipotential lines are also very complicated. The open equipotential lines include closed equipotential lines.

[0085] (2) The low equipotential lines are concentrated in the area w...

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Abstract

The invention discloses a deep karst leakage passage detection structure and method based on a drill rod inner pipe water level. The deep karst leakage passage detection structure comprises a drill hole (5). The drill hole (5) penetrates through an upper water-bearing layer (1) and a relative water-resisting layer (2) and reaches a lower water-bearing layer (3). A leakage passage (4) is located in the lower water-bearing layer (3). A drill rod (6) is arranged in the drill hole (5) and is of a hollow tubular structure. The inner pipe water level (8) is arranged in the drill rod (6). An outer pipe water level (9) is arranged in a cavity between the drill rod (6) and the inner wall of the drill hole (5). According to the deep karst leakage passage detection structure and method based on the drill rod inner pipe water level, the groundwater seepage field profile is drawn according to the drill rod inner pipe water level, and then the range of the leakage passage is delineated; and the drill hole inner pipe water level directly reflects the characteristics of the groundwater level on the lower portion of the drill hole and can more accurately reflect the underground space local groundwater flow characteristics and more directly embody the leakage passage information compared with a drill hole comprehensive water level.

Description

technical field [0001] The invention belongs to the fields of hydrogeology and engineering survey, and the invention relates to a method for observing the water level of the inner pipe of the drill pipe according to the geological drilling process, drawing the section of the groundwater seepage field, and then delineating the scope of the seepage channel, especially suitable for karst areas Exploration of deep seepage channels. Background technique [0002] Groundwater seepage is one of the main problems of reservoirs, foundation pits, etc. The key to solving the problem of groundwater leakage is to find the leakage channel. The existing detection methods for the leakage channel include drilling, geophysical prospecting, hydrogeological analysis and hydrogeological test. [0003] Seepage will be directly reflected in the seepage field. The groundwater seepage field of the reservoir or foundation pit can determine the large flow trend through the macroscopic judgment of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/047
CPCE21B49/00E21B47/047
Inventor 郑克勋郭维祥余波朱代强朱永清
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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