Coal mine drill hole deformation monitoring experimental method
A technology of deformation monitoring and experimental methods, which is applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc., can solve the problems of inability to monitor deep drilling deformation, etc., and achieve the effects of manpower saving, wide applicability and simple structure
Inactive Publication Date: 2017-10-20
CHINA UNIV OF MINING & TECH (BEIJING)
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[0003] In order to solve the problem that field experiments cannot monitor the deformation of deep boreholes in the process of coal mining, the present invention designs an experimental method for monitoring deformation of coal mine boreholes, which mainly includes PE pipes, borehole peepers, marking lengths, and subsequent graphics processing programs
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[0021] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings.
[0022] Such as Figure 1 As shown, the present invention is used for the coal mine borehole deformation monitoring experiment method, which mainly consists of a coal body borehole 2, a PE pipe 3, a marking length 4, a grouting area 5 and a borehole peeping instrument 6. First drill a borehole 2 with a length of 21m and an aperture of 90mm at the coal rock side 1 of the air inlet lane. Prepare three sections of PE pipe 3 with a length of 7m and an outer diameter of 80mm. This PE pipe has certain compression resistance and good elasticity. When it encounters external pressure, it is easy to deform but not easy to damage, so that Used to record and detect drilling deformation. On the inner surface of the front end of the PE pipe, affix the identification length 4, which is about 50mm long. The borehole peeping instrument 6 is prepared for bor...
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The invention discloses a coal mine drill hole deformation monitoring experimental method. A drill hole with the depth being 21 m and the hole diameter being 90 mm is drilled in an air inlet roadway of coal seam mining, and the distance between the drill hole and a bottom plate is 1.2 m; in the drilling process, a PE pipe with mark lengths is assembled into the drill hole from time to time; slurry is poured between the drill hole and the outer surface of the PE pipe; in the coal seam mining process, a drill-hole observation instrument is stretched into the PE pipe every day and takes photos of the inner surface of the PE pipe at the mark lengths of different depths; the taken photos are subjected to aftertreatment through matlab; the edge of the inner surface of the PE pipe and the mark lengths are expanded along the edge correspondingly to form lines, and the lengths of the two lines are measured to be L1 and L2; and the real length L3 of the edge of the inner surface of the PE pipe can be obtained through proportion scale calculation, so that change of drill hole strain is measured by calculating change of the L3. Thus, coal mine drill hole deformation monitoring can be achieved, experimental data are provided for coal mine safety analysis, and the shortcoming that a laboratory simulation research cannot reflect the real environment condition of a coal mine is overcome.
Description
technical field [0001] The invention relates to an experimental method for measuring borehole deformation, in particular to an experimental method for monitoring borehole deformation in coal mines. Background technique [0002] With the development of science and technology, coal mine experiment equipment has also been fully developed, various experimental equipment emerges in an endless stream, experimental conditions have also been greatly improved, and it is more convenient to conduct various coal mine experiments. Monitoring coal mine borehole deformation can well reflect the amount of coal body deformation during coal seam mining, and provides data and theoretical basis for safe mining of coal seam during mining. At present, the research on drilling deformation in the process of coal mine safety production cannot be effectively detected, and most of them are carried out on the scale of indoor experiments. However, there are large human factors and accidental errors in t...
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IPC IPC(8): E21B47/00E21B49/00
CPCE21B47/00E21B49/003
Inventor 周宏伟任伟光王路军
Owner CHINA UNIV OF MINING & TECH (BEIJING)