Comparative Analysis of Overburden Strata Movement in Fully Mechanized Top Coal Caving Mining in Entire (Sub) Layer of Ultra Thick Seam

Abstract:

Reasonable determination of entire layer or sublayer mining method is the key factor of safe and efficient mechanized caving mining of 14.0～28.0m ultra thick seam , numerical simulation on the entire (sub) layer coal caving mining by the FLAC3D , studying the stress and displacement variation of overburden strata , combining the underground pressure theory , comparative analysis on the calculation results . The results show that entire (sub) layer mining roof stress , movement contours are presented in a semi-elliptical arch morphology , indicating the existence of a high arch structure overburden formations , mining process appears roof tensile destruction , but the entire layer caving tensile stress intensity is lower than sublayer caving . When advancing the same distance , entire layer caving puts a greater impact on the overburden strata than the sublayer caving , has some features such as big range of influence and extent , small roof pressure , lead abutment pressure forward from grand , short time of achieving full extraction , etc.

• Periodical: Applied Mechanics and Materials (Volumes 744-746)
• Pages: 451-458
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.744-746.451
• Online since: March 2015
• Authors: Yong Ping Wu*, Hao Zhang, Pan Shi Xie
• Keywords: Entire (Sub) Layer Mechanized Caving Mining, Numerical Simulation, Overburden Strata Movement, Semi-Elliptical Arch, Ultra Thick Seam

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