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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。
The dynamic unloading effect of the initial stress field on the excavation boundary during the excavation of the circular tunnel is analyzed by the method of theoretical calculation, numerical simulation and engineering data verification. The damage range is calculated. The calculation results show that when the blasting excavation is carried out under the conditions of high ground stress, the range of damage caused by dynamic unloading of initial stress in rock mass is larger than the damage range caused by quasi-static unloading; and the lateral pressure coefficient λ and polar angle θ are Under the condition of a certain unloading rate, the bigger the lateral pressure coefficient λ is, the more obvious the dynamic unloading effect is, and the damage range generated by the unloading is also correspondingly large. The engineering example proves the rationality of this conclusion.