高地应力隧道爆破卸压残余应力方程验证研究
Verification Study on Residual Stress Equation of Pressure Relief in Blasting of High Ground Stress Tunnel
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摘要: 高地应力岩爆具有突发性、弹射性和延续性等显著特点,对隧道施工危害极大。根据前人研究初步得出的爆破卸压残余应力方程,结合川藏线某隧道发生岩爆的实际案例,采用理论方法和数值模拟FLAC3D法对隧道爆破卸压后残余应力变化规律进行分析总结,并对卸压残余应力方程的合理性和可行性进行验证。将二者结果进行对比发现,硬岩及较硬岩隧道爆破卸压残余应力方程具有较好的可行性,能较好地评价爆破卸压的应用效果。Abstract: High geo-stress rock burst has obvious characteristics such as suddenness, ejection and continuity, which is extremely harmful to tunnel construction. According to the preliminary calculation of the residual stress equation of blasting pressure in previous studies, combined with the actual case of rock burst in a tunnel of Sichuan-Tibet line, the theoretical method and numerical simulation FLAC3D method are used to analyze and summarize the residual stress variation law after tunnel blasting. The rationality and feasibility of the residual stress equation for pressure relief are verified. Comparing the results, it is found that the residual stress equation of blasting in hard rock and hard rock tunnel has good feasibility, and can better evaluate the application effect of blasting pressure relief.
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