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中文摘要：
采用理论计算、数值模拟和工程实测资料验证相结合的方法分析了圆形隧洞钻爆开挖时开挖边界上初始应力场动态卸荷效应,并计算了其破坏范围。计算结果表明在高地应力条件下进行爆破开挖时,初始应力动态卸荷在岩体中所产生的损伤范围比准静态卸荷所产生的损伤范围要大;侧压力系数λ和极角θ是影响初始应力动态卸载应力场的两个主要因素;在一定的卸载速率条件下,侧压力系数λ越大,动态卸载效应越显著,其所产生的损伤范围也相应较大。工程实例证明了该结论的合理性。
英文摘要：
Effect of the initial geo-stress unloading on the circular tunnel boundary is studied, and the damage area is calculated by use of combined method of theoretical analysis, numerical simulation by Dynamic FEM and verification with field monitoring vibration data. The results indicate that the damage area induced by the dynamic unloading is larger than that induced by the static unloading during blasting excavation. The main factors, which affect the dynamic stress of unloading, are side-face stress coefficient 2 and angle θ. The larger the λ is, the more remarkable the unloading effect is, and the damage area is much bigger under given unloading rate. The results of theoretical analysis are validated by the monitoring damage data.
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