Experimental research of influence of loading rate on brittle-ductile transition of mudstone in coal rock strata

被引：0
作者：
Zhang L. [1 ,2 ]
Zhang S. [1 ]
Mao X. [2 ]
Tang X. [3 ]
Qin H. [3 ]
Li B. [1 ]
Li M. [2 ]
机构：
[1] Civil Engineering Department, Xuzhou Institute of Technology, Xuzhou, 221000, Jiangsu
[2] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221116, Jiangsu
[3] Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2018年 / 35卷 / 02期
关键词：
Brittle-ductile transition; Ductility coefficient; Loading rate; Mudstone; Yield strain;
D O I：
10.13545/j.cnki.jmse.2018.02.022
中图分类号：
学科分类号：
摘要：
The loading rate can result in the change of rock's rupture shape. There is a critical velocity during the breakage process of material when brittleness transferring to plasticity. In order to investigate the brittle ductile transformation characteristics of mudstone under different loading rates, the mudstone in coal measure rock strata is chosen as the research object. Using MTS810 electro mechanical hydraulic servo test system and FEI Quanta TM250 scanning electron microscope, the mechanical test and SEM test are carried out to analyze the influence of loading rate on the yield strain, peak strain, ductility coefficient and stress-strain relation of mudstone. The results show that: With the increase of loading rate, the yield strain of mudstone shows a trend of gradual increase; the ductility coefficient of mudstone increases when the loading rate is 0.03 mm/s, and the rock failure reflects the ductile feature; At the loading rate of 0.03 mm/s, the macroscopic fracture of mudstone is the mixing of the vertebral fracture and shear rupture. The micro fracture morphology includes both of cleavage, intergranular cracks and trans granular cracks, the shear slip zone existing at the same time, the failure mode tends to ductility and the brittleness ductility reduces. The research results can provide important basis for research on geotechnical engineering problems. © 2018, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
引用
收藏
页码：391 / 396and401
相关论文
共 18 条
[1]  
Mouthereau F., Fillon C., Ma K.F., Distrubution of strain rates in the Taiwan orogenic wedge, Earth and Planetary Science Letters, 284, 3-4, pp. 361-385, (2009)
[2]  
Qi C.Z., Wang M.Y., Qian Q.H., Strain rate effects on the strength and fragmentation size of rocks, International Journal of Impact Engineering, 36, 12, pp. 1355-1364, (2009)
[3]  
He M., Xie H., Peng S., Et al., Study on rock mechanics in deep mining engineering, Chinese Journal of Rock Mechanics and Engineering, 24, 16, pp. 2803-2813, (2005)
[4]  
Alshayea N.A., Khan K., Abduljauward S.N., Effects of confining pressure and temperature on mixedmode (I-II) fracture toughness of a limestone rock, International Journal of Rock Mechanics & Mining Sciences, 37, 4, pp. 629-643, (2000)
[5]  
Zhou Y., Jiang H., He C., Experiments of brittle-plastic transition, modes of instability of Juyongguan granite at different T-P condition, Earthquake Research in China, 18, 4, pp. 389-400, (2002)
[6]  
Zhang L., Mao X., Experimental study of the mechanical effects of loading rates on limestone at high temperature, Rock and Soil Mechanics, 31, 11, pp. 3511-3515, (2010)
[7]  
Su H.J., Jing H.W., Zhao H.H., Experimental investigation on loading rate effect of sandstone after high temperature under uniaxial compression, Chinese Journal of Geotechnical Engineering, 36, 6, pp. 1064-1071, (2014)
[8]  
Wang S., Brittle-ductile transition and plasticflow networks in rocks, Progress in Geophysics, 8, 4, pp. 25-37, (1993)
[9]  
Brede M., Brittle-to-ductile transition in silicon, Acta Metallurgica Et Materialia, 41, 1, pp. 211-228, (1993)
[10]  
Sang Z., Zhou Y., He C., Et al., An experimental study on the brittle-plastic transition in gabbro, Journal of Geomechanics, 7, 2, pp. 130-137, (2001)
12