Investigation into the Use of Backfill Zones and Yielding Pillars for Subsidence Control


This paper investigates the use of backfill zones and yielding pillars for subsidence control. The investigation begins by choosing an appropriate subsidence predictive technique to simulate the proposed subsidence-control schemes. Two case studies are performed in order to delineate the accuracy and utility of the chosen predictive technique and then the results of these case studies are used to establish appropriate sets of regional site parameters. Next, a detailed analysis of the major variables affecting the outcome of the subsidence-control simulations is conducted and graphical displays of the exact sensitivity of the surface subsidence to these variables are given. The first technique to be assessed is a backfilled pillar centered longitudinally in a panel. With this arrangement, a minimal amount of backfill material can produce substantial decreases in vertical displacements. The second technique to be assessed is the use of yielding gate pillars to reduce the sinuosity of the transverse subsidence over adjacent panels. With proper design, this technique can greatly curtail surface strains and help minimize remedial drainage control.

Meeting Name

1986 Fall Meeting of SME


Mining Engineering


Soc of Mining Engineers of AIME, Littleton, CO, USA

Document Type

Article - Conference proceedings

Document Version


File Type





© 1986 Society for Mining, Metallurgy & Exploration Inc. (SME), All rights reserved.

Publication Date

01 Jan 1986

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