1、 4000 英文单词，英文单词，2 万英文字符，中文万英文字符，中文 4800 字字 文献出处：文献出处：Konicek P, Saharan M R, Mitri H. Destress blasting in coal miningstate-of-the-art reviewJ. Procedia Engineering, 2011, 26: 179-194. 英文原文 Destress Blasting in Coal Mining State-of-the-Art Review Petr Konicek , Mani Ram Saharan, Hani Mitri 1Institut
2、e of Geonics Academy of Sciences of the Czech Republic,Studentska 1768, 708 00 Ostrava-Poruba, Czech Republic,2Central Institute of Mining (b) Interbed crossover in a coal mine of South Africa 1; (c) Cutter roof failure in an US coal mine 2; (d) Rockburst in a German coal mine 3. Past research for m
3、easurement of stresses, understanding of stresses and prediction of the timing when and the rate at which the stresses will be in excess of the strength has been a mixed success. The mining process has, in the meantime, become faster, larger and being done at deeper levels. It is thus necessary that
4、 protective measures be evolved to deal with the damaging effects of excessive stresses. Figure 2 illustrates different methods evolved to deal with the damaging effects of excessive stresses and distress blasting is one of the oldest and proactive measures amongst the other methods 4. The mechanism of destress blasting is not well understood despite of the application of destress blasting in a wide range of mining conditions and objectives. The paper presents variou
