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Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep
Abstract Room-pillar technology is the main method used for underground gypsum resource mining. A large area of mined gob with a hanging roof is formed by continuous gypsum rock pillars, which continue to creep until failure occurs due to the long-term load of overlying strata. Once failure occurs, the gypsum-mined gob collapses suddenly and induces a serious dynamic mining disaster. In this study, using the creep experiment of gypsum rocks, a creep curve and the characteristics under the condition of a graded load were obtained. Furthermore, a creep model of the gypsum rock was established based on the creep experimental results. New FLAC numerical calculation models of gypsum-mined gob were established by inputting a creep model into the software for secondary development. Moreover, the stress distribution and plastic zone evolution of the gypsum rock pillars were analyzed. Finally, the mechanism of gypsum-mined gob collapse was revealed, and the lagging time was predicted. The results of this study are important for clarifying the lagging collapse mechanism of gypsum-mined gobs with rock creep.
Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep
Abstract Room-pillar technology is the main method used for underground gypsum resource mining. A large area of mined gob with a hanging roof is formed by continuous gypsum rock pillars, which continue to creep until failure occurs due to the long-term load of overlying strata. Once failure occurs, the gypsum-mined gob collapses suddenly and induces a serious dynamic mining disaster. In this study, using the creep experiment of gypsum rocks, a creep curve and the characteristics under the condition of a graded load were obtained. Furthermore, a creep model of the gypsum rock was established based on the creep experimental results. New FLAC numerical calculation models of gypsum-mined gob were established by inputting a creep model into the software for secondary development. Moreover, the stress distribution and plastic zone evolution of the gypsum rock pillars were analyzed. Finally, the mechanism of gypsum-mined gob collapse was revealed, and the lagging time was predicted. The results of this study are important for clarifying the lagging collapse mechanism of gypsum-mined gobs with rock creep.
Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep
Wang, Shuli (author) / Lv, Weikui (author) / Liu, Zhihe (author) / Zheng, Huaichang (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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