Detection method of coal mine underground reservoir coal pillar dam body earthquake safety

Abstract

The present invention discloses a detection method of coal mine underground reservoir coal pillar dam body earthquake safety. The method comprises the following steps of 1: establishing a numerical value model for a to-be-detected coal mine underground reservoir; 2: utilizing a numerical value simulation method to analyze, primarily determining the possibly damaged positions Ai on a coal pillar dam body of the coal mine underground reservoir on an earthquake condition; 3: designing a similar material physical model according to a numerical value result in the step 2, and carrying out a vibration test on the similar material physical model; 4: obtaining the shearing stresses tau i of the damaged positions Ai according to a vibration test result in the step 3; 5: calculating the earthquake safety coefficients Ki of the damaged positions Ai. The method of the present invention can evaluate the seismic safety of the coal mine underground reservoir coal pillar dam body on the mine earthquake or earthquake condition, and can give out a quantitative evaluation result of the coal mine underground reservoir anti-seismic property by aiming at the structure of the coal mine underground reservoir, and combining the rock breaking theory, the numerical value simulation method and the physical model test.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of mining engineering and water conservancy engineering, in particular to a method for detecting the seismic safety of a coal pillar dam body of an underground coal mine reservoir. Background technique [0002] my country is a water-short country, and the shortage of water resources poses a serious threat to the development of the national economy and the improvement of people's lives. Mine water is unavoidable in the process of coal mining. As a precious water resource, the mine water discharged by key state-owned coal mines alone is as high as 2.2 billion tons every year. On average, every ton of coal mined needs to discharge 2 tons of wastewater. On the one hand, the discharge of mine water not only wastes a lot of precious water resources, but also easily constitutes serious environmental pollution to the surrounding environment. On the other hand, there are abundant coal re...

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Problems solved by technology

[0006] (2) The main structure of the dam body of underground reservoirs in coal mines is safe coal pillars. Compared with the commonly used reinforced concrete materials for ground dam bodies, the mechanical properties of coal pillar materials are more difficult to determine;

[0007] (3) The restraining effect of the roof and floor on the coal pillar dam is an important factor affecting the safety of the coal pillar dam, which makes the safety evaluation of the coal pillar dam more difficult

[0008] Therefore, the seismic safety assessment method for surface structures is difficult to adapt to underground reservoirs.

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