Analysis on Key Strata’s Subsidence in Paste-Like Filling Face

Abstract:

Using theoretical analysis and actually test research to analyze stress condition of filling body and average subsidence of the key strata, analysis shows that the average vertical stress in filling body was about 15Mpa when entering into stable state, which is equal to the primary stress, 13.75Mpa. The filling body could tighten the roof well and the filling body can support full weight of the overlying strata. The limestone, thickness of 5.3m, above the 81006 working face is the key strata of mining stope. On the interaction between ground pressure and the supporting force of filling body, the whole key strata subsided about 98.64mm on average theoretically, as the height meter monitored, the subsidence value of key strata was 108mm on average, conforms to the theoretical value, which proves the filling effect was good. At the early stage after filling, the roof subsided relatively faster as the filling body had not coagulated completely and the strength was lower. At this stage the roof was not tightened enough with the filling body, it subsided relatively faster in some certain limited space. After a while, the limestone, the key strata of mining stope, became stable for a short term, and then it would continue to subside until being stable under the disturbance of the high layer, because the movement of lower layer created some space for high layer.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 525-530
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.525
• Online since: May 2012
• Authors: Jian Hao, Yong Kui Shi, Kuan Liu
• Keywords: Backfill Mining, Key Strata, Paste-Like, Subsidence

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