标题：Experimental study on the progressive failure mechanism and characteristics of strip coal pillar
作者：Chen, Shaojie ;Liu, Xingquan ;Zhu, Yan ;Zhao, Zenghui ;Qu, Xiao ;Wang, Feng
作者机构：[Chen, Shaojie ;Liu, Xingquan ;Zhao, Zenghui ;Qu, Xiao ;Wang, Feng ] State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shan 更多
来源：Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering
摘要：In order to study the progressive failure mechanism and characteristics of strip coal pillar, a test system for coal pillar progressive destruction was developed. Different loading-rate tests on simulation pillar coal specimen were conducted. Test results show that the destruction of strip coal pillar occurs gradually from the edge to the internal. First, the destruction occurs at the edge of middle upper position, then develops in both sides of the edge. The middle-upper coal pillar has maximum lateral deformation without lateral restraint, while the bottom lower. Due to the obvious fracture group, the failures of strip coal specimens show uneven spalling destruction. With the decrease in loading rate, the compressive strength firstly increases before a decrease. Meanwhile, the lateral deformation gradually increases with the loading rate. When the loading rate changes from 0.01 mm/s to 0.000 5 mm/s, the compressive strength increases from 8.346 MPa to 16.419 MPa, after which, decreases to 8.135 MPa. At the same time, the lateral deformation gradually increases by 33.40%.
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