Coal mining damage range determination method based on energy transfer conservation
A technology of energy transfer and determination method, applied in directional drilling, soil material testing, material inspection products, etc., can solve the problems of unclear damage conduction mechanism of overlying rock in coal seam mining, and difficulty in determining the damage range.
Active Publication Date: 2022-03-25
CHINA UNIV OF MINING & TECH (BEIJING)
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[0004] The invention provides a method for determining the damage range of coal mine mining based on energy transfer conservation, so as to solve the problems that the damage transmission mechanism of overburden rock in coal seam mining is unclear and the damage range is difficult to determine
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[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention is now described.
[0030] Such as figure 1 with figure 2 As shown, the coal mine mining damage range determination method based on energy transfer conservation of the present invention specifically includes the following steps:
[0031] a. Drilling holes 5 on the ground for mining coal seam 1 in the research mine, sampling and thickness H for each layer of overlying rock 2 i Measurement;
[0032] b. Carry out laboratory uniaxial compression test on each layer of rock samples, and measure the elastic modulus Ei of each rock layer and the elastic modulus E (unit MPa) and peak strain ε of the coal body m , plastic strain ε u and the residual elastic strain ε e ;The above strains have no units;
[0033] c. According to the bulk modulus E of the mined coal seam (mined coal body) 1, and the buried depth H, the volume strain caused by...
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The invention provides a coal mining damage range determination method based on energy transfer conservation, which comprises the following steps of: determining the thickness of each rock stratum of overlying strata through ground drilling, and sampling; actually measuring the elastic modulus Ei of each rock stratum and the elastic modulus E, peak strain epsilon m, plastic strain epsilon u and residual elastic strain epsilon e of the coal body in a laboratory by adopting a uniaxial compression method; according to the coal seam mining size, the coal seam burial depth H and the overlying strata volume weight gamma, the total energy released by coal seam mining is calculated, and according to the energy conservation principle, the plastic damage dissipation energy, the residual strain elastic energy and the disturbance area elastic strain energy of the damaged rock stratum, the residual energy Ec is calculated; and judging the size between the residual energy Ec and the limit strain energy Em of the next undamaged rock stratum. According to the method, the overlying strata damage conduction mechanism of coal mining can be cleared, the damage disturbance range caused by mining can be predicted, and a basis is provided for damage control.
Description
technical field [0001] The invention relates to the field of coal seam mining, in particular to a method for determining the damage range and conduction mechanism of overburden rock in the underground mining process of coal mines, in particular to a method for determining the damage range of coal mine mining based on energy transfer conservation. Background technique [0002] The scale of underground coal mines in China has grown from one million tons (1-3 million tons / year) in the 1990s to 10 million tons (10-30 million tons / year) at the beginning of this century. Improvement has become an important way to improve coal mine safety assurance, resource recovery rate and economic benefits. According to the intensive development layout, China's 14 large coal bases account for more than 95% of the country's output. High-intensity mining is an important method of intensive mining, but it brings about rapid surface subsidence and large deformation, which in turn seriously damages...
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IPC IPC(8): G01N33/24E21B7/04
CPCG01N33/24E21B7/04
Inventor 张村贾胜张通赵毅鑫马建起张晨曦崔舒畅
Owner CHINA UNIV OF MINING & TECH (BEIJING)