采矿与安全工程学报Issue(2)：317-324,8.DOI:10.13545/j.cnki.jmse.2015.02.023
高应变率下煤力学特性试验研究
Experimental study on mechanical properties of coal under high strain rate
摘要
Abstract
The mechanical properties of coal changing with the strain rate are proposed by impact uni-axial compression tests on split Hopkinson pressure bar (SHPB) equipment which with a diameter of 50 mm. Six different strain rates are provided for coal by designing test pressure levels with 0.30, 0.35, 0.40, 0.45, 0.50 and 0.55 MPa. Results of the tests are indicated as follows:Stress-strain curves of coal at high strain rates can be roughly divided into compaction phase, elastic deformation stage, mi-cro-cracks evolution stage, crack unstable growth stage and unload stage. What’s more, increased strain rate can shorten compaction phase and extended elastic deformation stage. With the increase of strain rate, the increment of dynamic elastic modulus and peak stress of coal can be approximately represented by a logarithmic trend, while decrement of the peak strain approximate logarithmic form. The damage extent of coal sample increases with the increasing strain rate, which becomes the most significant when strain rate increases from 68.666 s-1 to 79.751 s-1.The results can be provided the basis for determining the rationalized parameters of cutting coal mining engineering.关键词
高应变率/煤力学特性/冲击载荷/采矿工程Key words
high strain rates/mechanical properties of coal/impact load/mining engineering分类
矿业与冶金引用本文复制引用
李明,茅献彪,曹丽丽,茅蓉蓉,浦海..高应变率下煤力学特性试验研究[J].采矿与安全工程学报,2015,(2):317-324,8.基金项目
国家重点基础研究发展计划(973)项目(2013CB227900)；国家自然科学基金项目(51104128，51227003，U1261201，51322401)；教育部博士点基金项目(20120095110013)；江苏省高校研究生创新基金项目(KYLX_1371) （973）
