Stress field evolution law of mining environment reconstructing structure with change of filling height |
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Authors: | Qing-fa Chen Ke-ping Zhou and Li-li Wang |
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Affiliation: | [1]School of Resources and Safety Engineering, Central South University, Changsha 410083, China [2]College of Resources and Metallurgy, Guangxi University, Nanning 530004, China |
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Abstract: | For improving global stability of mining environment reconstructing structure, the stress field evolution law of the structure
with the filling height change of low-grade backfill was studied by ADINA finite element analysis code. Three kinds of filling
schemes were designed and calculated, in which the filling heights were 2, 4, and 7 m, separately. The results show that there
are some rules in the stress field with the increase of the filling height as follows: (1) the maximum value of tension stress
of the roof decreases gradually, and stress conditions are improved gradually; (2) the tension stress status in the vertical
pillar is transformed into the compressive stress status, and the carrying capacity is improved gradually; however, when the
filling height is beyond 2.8 m, the carrying capacity of the vertical pillar grows very slowly, so, there is little significance
to continue to fill the low-grade backfill; (3) the bottom pillar suffers the squeezing action from the vertical pillars at
first and then the gravity action of the low-grade backfill, and the maximum value of tension stress of the bottom pillar
firstly increases and then decreases. Considering the economic factor, security and other factors, the low-grade backfill
has the most reasonable height (2.8 m) in the scope of all filling height. |
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Keywords: | mining environment reconstructing strucre stress field filling height evolution law |
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