發(fā)布時間：2018-07-13 12:47

【摘要】：為研究孔底填塞長度與起爆位置對露天礦采空區(qū)上覆巖石臺階爆破的影響,進行了數(shù)值模擬和工業(yè)試驗。運用ANSYS/LS-DYNA軟件構(gòu)建了爆破模型,分析了存在采空區(qū)時臺階的爆破機理,通過對比分析不同孔底填塞長度、不同起爆位置下爆破時巖石拉應(yīng)力及動能變化,揭示其對采空區(qū)爆破效果的影響,確定了采空區(qū)上覆巖石臺階的合理爆破方法,并通過工業(yè)試驗進行了驗證。結(jié)果表明:采空區(qū)的存在導致爆破能量的利用效率降低;中間起爆技術(shù)適合采空區(qū)上覆巖石爆破;孔底填塞長度在一定臨界范圍內(nèi)時,爆破能量的利用效率是最佳的;確定了武家塔露天煤礦采空區(qū)上覆巖石臺階爆破采用中間起爆技術(shù)且孔底填塞長度為2 m。
[Abstract]:In order to study the effect of hole filling length and detonating position on the overlying rock bench blasting in opencast mine goaf, the numerical simulation and industrial test were carried out. The blasting model was constructed with ANSYS/LS-DYNA software, and the blasting mechanism of the time step in the goaf was analyzed. By comparing and analyzing the filling length of different hole bottom and detonating under different detonating positions. The effect of rock tensile stress and kinetic energy on the blasting effect in the goaf is revealed, and the reasonable blasting method for overlying rock steps in the goaf is confirmed and verified by industrial test. The results show that the existence of the goaf leads to the reduction of the utilization efficiency of blasting energy, and the intermediate detonation technology is suitable for the blasting of the overlying rock in the goaf. When the length of the hole bottom filling is within a certain critical range, the utilization efficiency of blasting energy is the best. The intermediate initiation technology is adopted and the length of the hole bottom filling is 2 M. in the rock overlying rock step blasting in the goaf area of the Wu Jia pan open pit mine.
【作者單位】： 遼寧工程技術(shù)大學礦業(yè)學院;
【基金】：國家自然科學基金重點項目(U1361211);國家自然科學基金面上項目(51474119)
【分類號】：TD235

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1 袁印;采空區(qū)密閉墻快速充填構(gòu)筑技術(shù)研究[D];河南理工大學;2016年

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本文編號：2119418