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Study On Floor Failure Features Above Confined Water In Sun Tuan Mine

Posted on:2011-03-10Degree:MasterType:Thesis
Country:ChinaCandidate:S H YangFull Text:PDF
GTID:2211330338473077Subject:Mining engineering
Abstract/Summary:PDF Full Text Request
Based on the practical coal mining and practical geological conditions of working face 1028 in Sun Tuan, Huaibei mining group, combining research method of theoretical analysis and numerical simulation and field test was applied to study the floor stress field and floor failure features under abutment pressure and hydraulic pressure. According to different movement of roof beam (before first roof pressure and motion by roof beam law) in the coal mining process, floor stress field and floor failure features were analyzed and studied. The elastic theory of arbitrary point stress distribution in half-plane infinite body with distributed force function was applied, and floor stress field caused by water pressure and the abutment pressure in different stages was reckoned, the same condition confined by stress gets a superposition of rock stress condition. According to the different advance distance, promoted the level and vertical stress of floor strata, and the maximum principal stress and the minimum principal stress was got with the elastic theory, and judged the elastic zone and the plastic zone with the Mohr-Coulomb criterion.The maximum depth and failure scope of the floor strata was calculated with the plastic theory. Coal floor stress field and failure features is simulated with FLAC3D numerical simulation software in different stage of roof beam during coal mining process. At the same time, combining with the actual conditions, and the choice of field test, field test of floor failure features in the process of mining was carried out. Field test results verified the correctness of the theoretical calculation and the numerical simulation results, thus, the theoretical analysis results and the numerical simulation results can provide theoretical references for the field, and at the same time, the results also has certain reference value for the similar condition of coal mining confined water.Figure 47 table 4 reference 72...
Keywords/Search Tags:floor failure features, floor stress field, confined water, abutment pressure, numerical simulation
PDF Full Text Request
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