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Stress-gradient-based method for dividing coal impact ground pressure danger area

A dangerous area, rock burst technology, applied in mining equipment, mining equipment, earthwork drilling and mining, etc., can solve the problems of low accuracy and large limitations, and achieve high accuracy, strong applicability, and significant effects

Inactive Publication Date: 2015-05-27
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The existing method is to infer whether there is a risk of impact based on the magnitude of the stress, but there is no direct relationship between the magnitude of the stress and the risk of impact, so this method has great limitations and low accuracy

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  • Stress-gradient-based method for dividing coal impact ground pressure danger area
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  • Stress-gradient-based method for dividing coal impact ground pressure danger area

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with accompanying drawing.

[0015] Stress gradient refers to the rate of change of the stress of coal and rock with time or space, which is the slope of the tangent line at any point on the "stress-time" curve or "stress-space" curve, that is, the rate of change of stress with respect to time or space, and the units are respectively It is MPa / min, MPa / m.

[0016] exist figure 1 Among them, a stress gradient-based method for the division of coal mine rockburst hazard areas includes the following steps:

[0017] Step 1: Before mining, collect geological data, including the name of each rock layer obtained from drilling exploration sampling, rock layer thickness, density, cohesion, elastic modulus, deformation modulus, tensile strength, Poisson's ratio, internal friction Angle and mine mining and working face layout data obtained according to the actual mining conditions of the mine;

[0018] The seco...

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Abstract

The invention discloses a stress-gradient-based method for dividing a coal impact ground pressure danger area. The method comprises the following steps: collecting geological data; simulating a mining value; calculating stress space distribution data and stress time distribution data; dividing an impact danger area; simulating the divided impact danger area according to the above values after a working surface is mined, monitoring stress of the area on line in real time to obtain a stress filed of the monitoring area, repeating the above steps, collecting geological data, dividing, forecasting and early warning the impact ground pressure danger area according to stress data. According to the stress-gradient-based method for dividing the coal impact ground pressure danger area, an impact ground pressure is forecasted and early warned due to a coupling relation existing between the stress gradient of the area and the coal rock impact damage condition; the impact danger area is divided according to the abnormal stress gradient; the method is strong in applicability and high in accuracy, is capable of accurately forecasting and early warning the impact ground pressure danger area and ensuring the property safety of mine and the life safety of workers, and has great significance to the coal mine safety.

Description

technical field [0001] The invention relates to a method for dividing dangerous areas of rock burst in coal mines based on stress gradients. Background technique [0002] The coal industry is my country's basic industry, and its healthy, stable and sustainable development is a major issue related to national energy security. With the increase of mining depth, expansion of mining scope and increase of mining intensity, although many However, the number of mine wells and the total number of rock bursts did not decrease. Especially in the eastern mines, there are not a few mines with a depth of 1000 meters, and there will be more and more mines. From the perspective of coal mine mining practice, the number of mines with rock burst will gradually increase, and the rock burst disaster will become more serious. If the pressure in the coal and rock mass exceeds the strength limit of the coal and rock mass, the energy accumulated in the coal and rock mass around the roadway or stope...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00
CPCE21F17/00
Inventor 陆菜平刘广建刘洋张农王洪宇刘鹏飞
Owner CHINA UNIV OF MINING & TECH
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