文献类型：期刊文献

英文题名：Experimental Study on Strength Weakening of Gypsum Rock with Effect of Long-Term Overlying Strata Pressure

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

第一作者：Wang, Shuli

通信作者：Liu, ZH[1]

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

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

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

年份：2022

卷号：14

期号：18

外文期刊名：SUSTAINABILITY

收录：;Scopus(收录号：2-s2.0-85138987231);WOS:【SSCI(收录号:WOS:000859571500001)，SCI-EXPANDED(收录号:WOS:000859571500001)】；

基金：This research was funded by the National Natural Science Foundation of China (Grant No. 51904177), the Natural Science Foundation of Shandong Province (Grant No. ZR2019BEE078), and Guizhou Science and Technology Major Projects (Grant No. [2018]3005).

语种：英文

外文关键词：gypsum rock; strength weakening; mine gob collapse; uniaxial compressive strength; elastic and plastic

摘要：A long time lag is the main characteristic of gypsum mined gob collapse disasters. With the coring of a gypsum rock specimen from the supporting pillars in gob, which formed over several years, the strength weakening effect of the gypsum rock with long-term overlying strata pressure is revealed by experimentation. The results show that: uniaxial compression stress-strain curves represent major differences in different lateral depths of the same supporting pillar. With the increase in lateral depth, peak strength increases and the corresponding strain decreases, which becomes more obvious as the age increases. As a function of time, peak strength decreases and the corresponding strain increases in the shallow part of the pillar as the age increases. Peak strength fluctuates in the middle part and increases in the deep part; the corresponding strain fluctuates in the middle and deep parts, but demonstrates the opposite changing law. Finally, the reason for the above law was comprehensively and thoroughly researched and demonstrated. The maximum strength weakening rate of gypsum rock in the shallow part of a supporting pillar of 0.5 m depth was 21.06% in the year 1996. The slow strength weakening effect of gypsum rock with long-term overlying strata pressure is the essential reason why gypsum mined gob collapses occur in subsequent years or even decades.