CN112554953A - Method for judging impact risk of syncline shaft stope by window intervention method - Google Patents

Abstract

The invention discloses a method for judging impact risk of a syncline shaft stope by a window intervention method, which comprises the following steps: step one, observing and analyzing the ground stress: according to the concrete position of the stope and geological mining conditions, carrying out ground stress field observation, observing the area of the ground stress field, and carrying out on-site study and judgment on the damage trace of the ground stress to the roadway to serve as the basis of impact risk prediction; step two, a manual window intervention technology: for a mining field with a syncline shaft part, according to the observation result of a ground stress field, arranging observation drill holes along the vertical direction of a main stress direction, installing a pressure-bearing type stress meter on a vertical top-bottom plate in each drill hole, observing the change of stress, and converting the change into displacement; step three, judging impact risk by displacement mutation in the window: and continuously observing the displacement condition of the stress meter, and taking the displacement condition as an impact danger early warning when a plurality of borehole stress meters are subjected to displacement mutation.

Description

Method for judging impact risk of syncline shaft stope by window intervention method

Technical Field

The invention belongs to the technical field of coal mining, and particularly relates to a method for judging impact risk of a syncline shaft stope by a window intervention method.

Background

Rock burst is one of the most serious disasters of coal mines and shows a growing trend. The geological conditions of deep mines in China are complex and changeable, factors of the deep mines are more decisive when the deep mines go to the deep mines, and factors influencing the rock burst comprise structure, burial depth, a top plate, coal bed hardness, mining factors and the like, wherein the rock burst caused by a syncline structure occupies a large proportion, and coupling damage is easy to occur. How to solve tectonic rock burst is a major technical problem faced by coal mines. Under the condition, the rock burst is difficult to achieve the degree of complete control by adopting the conventional measures of improving roadway layout, coal seam water injection, strong support, strong pressure relief of the coal seam, top breaking, bottom breaking and the like. As the mining depth increases and the complexity of geological conditions increases, it is difficult for conventional prediction to obtain quantitative information. Therefore, prediction and control of the impact ground pressure of the syncline shaft stope under the conditions of multiple structures, high stress and large burial depth are problems to be solved urgently.

At present, the prediction of rock burst danger under the condition is basically consistent with that of a common working face, and mainly comprises micro-shock, a drilling cutting method, electromagnetic radiation, stress online, mine pressure observation and the like. Until now, there has been no method for predicting impact risk in a targeted and specific manner for specific conditions of a syncline section stope. The conventional monitoring technology of the conventional method is difficult to quantitatively warn the impact danger of a mining field on an inclined shaft part and monitor the stress distribution and the energy release range caused by unreasonable ground stress and engineering layout. And a manual intervention method is required, and the shock sensitive direction is monitored aiming at the stress characteristic of the syncline shaft part, so that the dangerous precursor information of the rock burst is really monitored.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide an impact risk judgment method for observing coordination between a man-made window intervention technology and a ground stress azimuth aiming at the condition that the impact risk of a syncline shaft part stope is difficult to judge.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a method for judging impact risk of a syncline shaft stope by a window intervention method comprises the following steps:

step one, observing and analyzing the ground stress: according to the concrete position of the stope and geological mining conditions, carrying out ground stress field observation, observing the area of the ground stress field, and carrying out on-site study and judgment on the damage trace of the ground stress to the roadway to serve as the basis of impact risk prediction;

step two, a manual window intervention technology: for a mining field with a syncline shaft part, according to the observation result of a ground stress field, arranging observation drill holes along the vertical direction of a main stress direction, installing a pressure-bearing type stress meter on a vertical top-bottom plate in each drill hole, observing the change of stress, and converting the change into displacement;

step three, judging impact risk by displacement mutation in the window: and continuously observing the displacement condition of the stress meter, and taking the displacement condition as an impact danger early warning when a plurality of borehole stress meters are subjected to displacement mutation.

The invention has the positive effects that:

1. the method comprises the steps of acquiring the main direction of the ground stress by observing and analyzing the ground stress of a stope with a syncline shaft on site, and researching and judging an impact dangerous area by combining the layout condition of stope engineering;

2. adopting a manual window intervention technology, namely constructing a plurality of observation drill holes along the direction of the roadway in the direction vertical to the main stress direction in the roadway, and installing pressure-bearing stress meters in the drill holes;

3. by continuously observing the displacement change of the stressometers and combining dynamic display (microseism and the like), the real-time early warning of impact danger is carried out by the sudden change of the displacement of the stressometers.

Drawings

Fig. 1 is a schematic diagram of the results of ground stress monitoring, fig. 2 is a schematic diagram of the design of a borehole, and fig. 3 is a strain gauge displacement curve.

Detailed Description

The embodiment of the invention provides a method for judging impact risk of a syncline shaft stope by a window intervention method, which comprises the following steps:

firstly, determining an impact risk monitoring area according to data such as a stope specific mining environment and an impact ground pressure risk evaluation report and the like and by combining specific ground stress observation data, and referring to fig. 1;

secondly, constructing a plurality of observation drill holes along the trend of the roadway and in the vertical direction of the main stress, wherein the depth of each drill hole is generally 12-15m, and a pressure-bearing type stress meter is installed, wherein 1 is an observation drill hole, and 2 is a stress meter, which is shown in figure 2;

and thirdly, continuously observing the displacement change condition of the stress meter, and judging the impact danger degree according to the displacement mutation by combining the dynamic display condition, which is shown in figure 3.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (1)

1. A method for judging impact risk of a syncline shaft stope by a window intervention method is characterized by comprising the following steps: the method comprises the following steps: step one, observing and analyzing the ground stress: according to the concrete position of the stope and geological mining conditions, carrying out ground stress field observation, observing the area of the ground stress field, and carrying out on-site study and judgment on the damage trace of the ground stress to the roadway to serve as the basis of impact risk prediction;

step two, a manual window intervention technology: for a mining field with a syncline shaft part, according to the observation result of a ground stress field, arranging observation drill holes along the vertical direction of a main stress direction, installing a pressure-bearing type stress meter on a vertical top-bottom plate in each drill hole, observing the change of stress, and converting the change into displacement;

step three, judging impact risk by displacement mutation in the window: and continuously observing the displacement condition of the stress meter, and taking the displacement condition as an impact danger early warning when a plurality of borehole stress meters are subjected to displacement mutation.

Images