Unlock instant, AI-driven research and patent intelligence for your innovation.

Coal mine rock burst prevention and control dynamic early warning method based on microseism

A technology of rock burst and dynamic early warning, which is applied to mining equipment, earth square drilling, mining equipment, etc., and can solve the problems of low prediction accuracy, difficult value selection, and too wide range of rock burst hazards in working faces

Pending Publication Date: 2021-02-05
SHANGHAI DATUN ENERGY
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The setting of early warning indicators is greatly affected by human factors, and the range is too wide
[0008] 2. The early warning method is mainly a static index method, which cannot reflect the real-time state of the underground, and the accuracy is poor
[0009] 3. It is difficult to select the parameters of the indicators in the early warning method, and the timeliness is insufficient
[0010] 4. The early warning method has low accuracy in predicting the risk of rock burst in the working face
[0012] The monitoring of roadway surrounding rock stability at home and abroad is mainly based on shallow monitoring such as displacement monitoring. Before the result of rock failure, the interior of the rock mass has already been damaged, so it is difficult to truly predict the process of roadway instability
Microseismic monitoring is a real-time and continuous rock mass launch monitoring technology. The microseismic monitoring system is used to detect the seismic waves emitted by micro-ruptures to determine the location of the earthquake, give the strength and frequency of seismic activity, and judge the potential rock burst However, at present, the microseismic early warning indicators are mostly static "one-side-one-indicator" adjustments are not made or less adjusted during the entire working face recovery period, and the risk of rock burst at the working face cannot be predicted in real time.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coal mine rock burst prevention and control dynamic early warning method based on microseism
  • Coal mine rock burst prevention and control dynamic early warning method based on microseism

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051] Example 1: see attached figure 2 Shown: From July 3rd to July 5th, the total energy trend line was below the total energy trend line for three consecutive days, forming a lack of shock effect, and the early warning process was started. On July 6, the total energy decreased and the frequency increased. Early warning notice, on July 7, the total energy decreased, the frequency increased, and the early warning level was raised. On July 8, a damage event of more than 100,000 levels occurred on the upper part of the working face. Due to the restricted personnel in the area in advance, no casualties occurred , the warning is successful.

example 2

[0052] Example 2: Attached figure 2 : From July 12 to July 7.14, the total energy of microseismic monitoring was below the trend line of the total energy for three consecutive days, and it was in a state of lack of earthquakes. The early warning process was started. On July 15, the energy and frequency both increased, and the shock prevention department issued an early warning notice Single, a 100,000-magnitude microseismic event occurred in the working face on July 16, and the early warning was successful.

[0053] The coal seam occurrence conditions in different mining areas are different, and the total energy released periodically by the roof is different. However, when it comes to the energy release of the roof of a single working face, it can be approximately regarded as a fixed value. By judging the size of the total energy, it can be determined whether there is a shortage of energy in the roof of the working face. The impact risk of the current working face can be pred...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a coal mine rock burst prevention and control dynamic early warning method based on microseism, and belongs to the technical field of coal mine safety. The method specificallyincludes the steps of (1) generating an energy and frequency trend chart by taking the total frequency and total energy of a single working face every day as cardinal numbers; (2) judging whether an earthquake is lacked or not according to whether the total energy is continuously below a total energy trend line for three days or not; and (3) analyzing four conditions of relationship between the frequency and the released energy under the condition of lack of earthquake to judge whether early warning is carried out or not; and the four conditions are that (1) early warning is started if the energy and the frequency are both increased; (2) if the energy and the frequency are reduced, the early warning is not started; (3) if the energy rises and the frequency drops, the early warning is not started; and (4), the early warning is started if the frequency rises and the energy drops. After comprehensive analysis according to the coal mine rock burst prevention and control dynamic early warning method based on the microseism, whether an impact risk exists or not is judged, advanced early warning and advanced prevention are achieved, and the rock burst pressure accident risk is reduced.

Description

technical field [0001] The invention relates to a dynamic early warning method for preventing rock bursts in coal mines, and belongs to the technical field of coal mine safety. Specifically, it is a dynamic early warning method for coal mine prevention and control of rock burst based on microseismic. Background technique [0002] The prediction of rock burst is the basis of the prevention and control of rock burst, and its prediction and forecast mainly fall into the following two categories. [0003] The first is the mining method, including the comprehensive index method for determining the risk of rock burst according to the mining geological conditions, the numerical simulation analysis method, the drilling cuttings method, and the classification method for the tendency of rock burst in coal strata. The cuttings method is based on the highest amount of pulverized coal, the distance from the coal wall, and the dynamic phenomenon that occurs during the drilling process to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21F17/18
CPCE21F17/18
Inventor 丁传宏史矿民唐坤孙继全王秀峰
Owner SHANGHAI DATUN ENERGY