CN-122014335-A - Coal mine goaf filling position and filling time judging method

CN122014335ACN 122014335 ACN122014335 ACN 122014335ACN-122014335-A

Abstract

The invention provides a coal mine goaf filling position and filling time judging method, which belongs to the technical field of coal mine goaf filling and comprises the following steps of S1, collecting mine basic data, S2, analyzing a cover rock migration mode according to the collected basic data, determining three-zone distribution characteristics of cover rock, a key layer position, a separation layer position, determining a collapse zone, a fracture zone height H f and a separation layer position H s , S3, designing a monitoring scheme suitable for goaf filling space judgment, determining implementation details of the monitoring scheme, S4, deriving a subsidence amount according to collected data frequency to obtain a subsidence rate, outputting an actually measured earth surface subsidence rate, S5, judging the filling space and filling time, providing goaf residual space distribution and judging standards, S6, judging whether a goaf corresponding to an observation point has a filling space according to the judging result, and determining favorable filling time.

Inventors

ZHANG KANGNING
FU DELIANG
HE DAN
ZHANG YUPING
GAO XIANG
Zhang sida
GAO BO

Assignees

陕西省煤田地质集团有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (7)

1. A method for judging filling positions and filling time of a coal mine goaf is characterized by comprising the following steps: S1, collecting mine basic data; S2, analyzing a cover rock migration mode according to the collected basic data, determining three-zone distribution characteristics of the cover rock, a key layer position and a separation layer position, and determining a collapse zone, a fracture zone height H f and a separation layer position height H s ; s3, designing a monitoring scheme suitable for judging the filling space of the goaf, and determining implementation details of the monitoring scheme; S4, deriving the subsidence amount according to the acquired data frequency to obtain the subsidence rate, and outputting the actually measured earth surface subsidence rate; S5, judging filling space and filling time, and providing goaf residual space distribution and judging standard; and S6, judging whether the goaf corresponding to the observation point has a filling space or not according to the judging result, and determining favorable filling time.
2. The method of claim 1, wherein the mine basic data in step S1 includes coal seam occurrence characteristics and face mining parameters.
3. The method for judging the filling position and the filling time of the goaf of the coal mine, as set forth in claim 1, is characterized in that in the step S3, a monitoring scheme suitable for judging the filling space of the goaf is designed, and implementation details of the monitoring scheme are determined, and specifically include the following steps: S301, collecting the past subsidence data of the mining area, wherein the data comprise a maximum subsidence amount w max and a maximum subsidence rate v max ; S302, arranging a ground surface survey line on the upper part of a goaf, wherein the goaf range specifically refers to a rectangular area formed by a working surface, an open-cut hole, a return air cis-slot and a transportation cis-slot, and the ground surface monitoring area mainly is a rectangular area right facing the ground surface area; s303, designing a monitoring scheme suitable for judging the goaf filling space, determining implementation details of the monitoring scheme, and monitoring the ground surface subsidence quantity by using a total station to obtain the actually measured ground surface subsidence quantity w.
4. The method for judging the filling position and the filling time of the goaf of the coal mine according to claim 3, wherein the monitoring scheme in the step S303 specifically comprises three goaf boundary subsidence measuring lines and one goaf middle subsidence measuring line; The three goaf boundary subsidence measuring lines consist of a goaf boundary main measuring line and two goaf boundary auxiliary measuring lines; Three goaf boundary subsidence survey lines are arranged on the ground surface at one side of the return air gate or the transportation gate, and one goaf middle subsidence survey line is arranged on the ground surface at the middle part of the working surface.
5. A method for judging filling position and timing of coal mine goaf as set forth in claim 4, wherein goaf boundary subsidence measuring line is selected from goaf distance transportation gate and return air gate l Within the range, the cover rock fracture angle is used as a calculation basis and is calculated by the following formula of l=H s /tan theta.
6. The method for judging the filling position and the filling time of the coal mine goaf according to claim 4, wherein the main line of the goaf boundary is arranged at a position distant from a crossheading d 1 =0.5*(H s /tan theta+10) and is arranged along the advancing direction of the working face; And supplementing auxiliary goaf boundary measuring lines on two sides of the main goaf boundary measuring line, wherein the auxiliary goaf boundary measuring lines are along the advancing direction of the working surface, one measuring line is away from the corresponding surface d 2 =H s /tan theta of the return air cis-slot, and the other measuring line is away from the corresponding surface d 3 =10m of the return air cis-slot.
7. The method for determining filling positions and filling timings of a goaf in a coal mine according to claim 1, wherein the step S5 of determining whether the goaf corresponding to the observation point has a filling space comprises the steps of: in the initial formation stage of the filling space, the subsidence value of the ground surface is minimum, and the subsidence rate is smaller; In the initial closing stage of the filling space, the surface subsidence value and the subsidence rate are gradually increased; the filling space accelerates the closing stage, and the ground surface subsidence value is gradually increased; In the closing stage of the filling space, the subsidence value of the ground surface is close to the maximum subsidence value, and the subsidence rate is low.

Description

Coal mine goaf filling position and filling time judging method Technical Field The invention belongs to the technical field of filling of coal mine goafs, and particularly relates to a coal mine goaf filling position and filling time judging method. Background At present, goaf grouting filling is one of main means of coal-based solid waste disposal, the coal mine goaf grouting filling does not affect normal production of an underground working face, but a major core problem of goaf grouting is that the filling position and the filling time are accurately judged, a detection technology for goaf filling space is mainly concentrated on theoretical calculation, field actual measurement, numerical simulation and the like, for example, the grouting filling position is judged based on a key layer theory, a three-band theory and an O-shaped ring theory, the numerical simulation is assisted, and technologies such as subsidence monitoring, geophysical prospecting and drilling are used for detecting the filling space and the grouting time. However, the existing detection technology has the problems of high labor intensity, high detection cost and the like, especially the technologies such as drilling and the like are difficult to be arranged in a large range and multiple points, and the detection technology is difficult to grasp reasonable filling time. The numerical simulation stope is difficult to be consistent with the actual stope of the working face, so that the accuracy of numerical simulation and field matching is limited. The existing subsidence observation scheme is generally characterized in that a measuring line is arranged along the middle area of a working surface, a trend measuring line is arranged along the trend direction of a planned working surface, goaf filling space exploration and filling time determination are difficult to realize, the goaf filling space analysis is not performed by combining the main structure of a rock stratum and the rock stratum migration mode, and the on-site earth surface monitoring scheme and the determination index of the filling space and the filling time are lacked. Therefore, a coal mine goaf filling position and filling time judging method is provided to solve the problems. Disclosure of Invention In order to achieve the above purpose, the invention provides a coal mine goaf filling position and filling time judging method, which comprises the following steps: S1, collecting mine basic data; S2, analyzing a cover rock migration mode according to the collected basic data, determining three-zone distribution characteristics of the cover rock, a key layer position and a separation layer position, and determining a collapse zone, a fracture zone height H f and a separation layer position height H s; s3, designing a monitoring scheme suitable for judging the filling space of the goaf, and determining implementation details of the monitoring scheme; S4, deriving the subsidence amount according to the acquired data frequency to obtain the subsidence rate, and outputting the actually measured earth surface subsidence rate; S5, judging filling space and filling time, and providing goaf residual space distribution and judging standard; and S6, judging whether the goaf corresponding to the observation point has a filling space or not according to the judging result, and determining favorable filling time. Further, the mine basic data in step S1 includes coal seam occurrence characteristics and working face mining parameters. Further, in step S3, a monitoring scheme suitable for goaf filling space determination is designed, and implementation details of the monitoring scheme are determined, which specifically includes the following steps: S301, collecting the past subsidence data of the mining area, wherein the data comprise a maximum subsidence amount w max and a maximum subsidence rate v max; S302, arranging a ground surface survey line on the upper part of a goaf, wherein the goaf range specifically refers to a rectangular area formed by a working surface, an open-cut hole, a return air cis-slot and a transportation cis-slot, and the ground surface monitoring area mainly is a rectangular area right facing the ground surface area; s303, designing a monitoring scheme suitable for judging the goaf filling space, determining implementation details of the monitoring scheme, and monitoring the ground surface subsidence quantity by using a total station to obtain the actually measured ground surface subsidence quantity w. Further, the monitoring scheme in step S303 specifically includes three goaf boundary subsidence lines and one goaf middle subsidence line; The three goaf boundary subsidence measuring lines consist of a goaf boundary main measuring line and two goaf boundary auxiliary measuring lines; Three goaf boundary subsidence survey lines are arranged on the ground surface at one side of the return air gate or the transportation gate, and one goaf middle subsidence survey li