Analysis of Cement Pillar Stability Based on Hyperstatic Structure Theory and Numerical Simulation

YU Jian; WANG Guihuang

doi:10.3981/j.issn.1000-7857.2014.22.004

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Science & Technology Review ›› 2014, Vol. 32 ›› Issue (22) : 34-37. DOI: 10.3981/j.issn.1000-7857.2014.22.004

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Analysis of Cement Pillar Stability Based on Hyperstatic Structure Theory and Numerical Simulation

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School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Abstract

In order to evaluate the stability of cement pillar scientifically and accurately, an analytic evaluation method that is based on the theory of statically indeterminate structure and numerical simulation is proposed. An artificial pillar is simplified to a statically indeterminate structure and the maximum stress is calculated by an indeterminate model using the comprehensive action of tailings backfill lateral pressure, top loose rock pressure and its own gravity. The pillar stability is tested by uniaxial compressive test data on cemented waste-rock and the finite element analysis software Midas, which is used to simulate the loading force and output the effective stress and strain-displacement. The cement pillar of Dahongshan copper mine is used as an example, and it is shown that the maximum stresses by statically indeterminate theory and simulation software are 6.27 MPa and 3.55 MPa, respectively, the maximum strain-displacement is 40.46 mm, and the cemented waste-rock uniaxial compressive strength is 10.9 MPa. All of the above shows that it is feasible to test the pillar stability by the method of statically indeterminate and numerical simulation.

Key words

stability of cement pillar / statically indeterminate structure / tailings backfill lateral force

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YU Jian, WANG Guihuang. Analysis of Cement Pillar Stability Based on Hyperstatic Structure Theory and Numerical Simulation[J]. Science & Technology Review, 2014, 32(22): 34-37 https://doi.org/10.3981/j.issn.1000-7857.2014.22.004

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