科研之友
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摘要
The vertical stress transformation by arching effect was calculated by Belem model, the vertical stress reduction ratio was compared before and after the introduction of arch, which from the analysis of three kinds of forces (surrounding rock supporting, self-standing with one face exposed, equipment supporting). The results show that, the self-weight pressure of long-narrow backfill body in Chambishi Copper Mine is 0.4 MPa, after the arching effect transporting, the remained vertical pressure is 0.055 MPa, which means almost 86.25% self-weight press is diverted to the horizontal pressure. The maximum principal stress is 0.289 MPa with the direction of horizontal along the width of backfill body. The required UCS the surrounding rock and equipment supporting is 1 MPa, for self-standing with one face exposed is 0.2 MPa. The target strength design of long-narrow backfill body should consider the arching effect on transformation of the vertical stress, so as to reduce the related technical and economic index.
