Abstract
Focusing on the deterioration of the surface ecological environment caused by large-scale exploitation of the Jurassic coal field in northern Shaanxi, the three-dimensional similar material test model is made to simulate the extraction of shallow coal seam. Using Brillouin optical time-domain analysis (BOTDA) optical fiber distributed sensing technology, this paper studied the strain distribution rule and movement characteristics of strata under reamer-pillar mining, analyzed the stability of the remaining coal pillars in the mining area, and obtained the strain contour graph of strata through calculations. The research result shows that the deformation of coal pillars in a safety-critical state under reamer-pillar mining experiences three stages. The stratum deformation is distributed in the shape of a pyramid with the mining area as the center. On the basis of the strain distribution of strata, the settlement curve and subsidence curve of strata deformation are determined to obtain the rupture angle and angle of draw. After being compared with the measured data, the angle values are almost the same.
Highlights
The Jurassic coal field in Yushenfu of northern Shaanxi is the largest proven coal field in China, whose amount of coal resources accounts for about 14% of the total retained coal resources in China [1].Desert and Loess Plateau, its water resources are scarce, vegetation is sparse, and the surface ecological environment is fragile
(1) The strain distribution of overlying strata under mining is obtained according to the sensor optical fibers laid at different heights
The derivation method of mining subsidence parameters based on distributed optical fiber sensing technology will provide the necessary calculation parameters for mining subsidence prediction
Summary
The Jurassic coal field in Yushenfu of northern Shaanxi is the largest proven coal field in China, whose amount of coal resources accounts for about 14% of the total retained coal resources in China [1]. Important parameters level manometer [6], an optical fiber sensor [7], and a borehole TV tester [8] are installed in such as strain and displacement for the mining subsidence prediction are obtained through the coring overburden strata of the coal mining face to grasp the movement characteristics of overburden strata in surface boreholes [9] and the statistical theory of big data [10]. Important parameters such as strain and displacement for the mining subsidence prediction as are an effective rock engineering has of simulating a geological obtained means throughofthe coring in surfaceresearch, boreholes [9]the andadvantages the statistical theory of big data [10].
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