文献类型：期刊文献

英文题名：Damage Mechanism and Stress Distribution of Gypsum Rock Pillar Subjected to Blasting Disturbance

作者：Wang, Shuli Liu, Zhihe Zhang, Kaizhi Zheng, Huaichang

第一作者：Wang, Shuli

通信作者：Liu, ZH[1]

机构：[1]Shandong Univ Technol, Sch Resource & Environm Engn, Zibo 255000, Peoples R China;[2]Guizhou Inst Technol, Guiyang 550003, Peoples R China

第一机构：Shandong Univ Technol, Sch Resource & Environm Engn, Zibo 255000, Peoples R China

通信机构：corresponding author), Shandong Univ Technol, Sch Resource & Environm Engn, Zibo 255000, Peoples R China.

年份：2022

卷号：14

期号：9

外文期刊名：SUSTAINABILITY

收录：;Scopus(收录号：2-s2.0-85129192052);WOS:【SSCI(收录号:WOS:000794751800001)，SCI-EXPANDED(收录号:WOS:000794751800001)】；

基金：This research was funded by the National Natural Science Foundation of China, grant number 51904177.

语种：英文

外文关键词：gypsum mine; rock pillar; blasting disturbance; damage and stress distribution; collapse

摘要：The room-pillar mining technology of underground gypsum resources results in numerous gypsum rock pillars for controlling and supporting mined gobs, which forms a large area of roof hanging gobs. Owing to weathering and mining activities, gypsum rock pillar damage and failure will occur, thereby inducing a large area of gypsum mined-gob collapse accidents and disasters. Blasting is vital to the stability of gypsum rock pillars and is indispensable in mining engineering. Based on field blasting tests and using wave velocity as the basic parameter to characterise the integrity of gypsum rock, the damage mechanism of gypsum rock pillars subjected to blasting disturbance is investigated. With ten blasting tests, the maximum damage rate is 7.82% along the horizontal direction of pillar, and 3.52% along the vertical direction. The FLAC numerical simulation calculation software is used to analyse the stress distribution law of gypsum rock pillars with disturbances of different strengths from different distances. As the disturbance strength increased, the stress increased with no clear linear relationship; as the disturbance distance increased, the stress decreased gradually with a linear relationship. All stress after disturbance is greater than the original static stress, and lower than the ultimate compressive strength. However, the correlation between blasting tests results and numerical simulation results is poor and is discussed for many factors. The results can provide important guidance and reference for clarifying the damage mechanism of gypsum rock pillars subjected to blasting disturbance, as well as reveal the collapse mechanism of gypsum mined gobs.