College of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, Guangxi, China.
School of Civil and Architectural Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China.
Sci Rep. 2023 Feb 3;13(1):1974. doi: 10.1038/s41598-023-28900-w.
In the process of cyclic blasting during tunnel excavation, the reserved surrounding rock sustains irreparable damage accumulation. For safe tunnel construction, it is imperative to understand the characteristics of blasting dynamic cumulative rock damage. Sonic wave test and numerical simulation methods were applied to the research. The JH-2 model was adopted as the damage model of surrounding rock. Based on the data transfer method between solvers in ABAQUS software, the cumulative damage was calculated. The damage characteristics were obtained by combining the sonic wave test results. According to the research findings, the entire reserved surrounding rock has periodic damage characteristics. Each periodic damage area has a funnel shape along the tunnel's longitudinal direction, with a length of 160 cm, and 1.07 times the excavation footage. The latter excavation footage's blasting effect on the damaged area of the previous footage rock is 40 cm long, with three cumulative damage patterns. The three cumulative damage patterns more clearly reveal the surrounding rock's additional damage law, the degree of additional damage is greatest with the distance of 5-20 cm from the latter excavation footage. The research can provide appropriate theoretical guidance for the design of the step-blasting construction tunnel's blasting scheme and lining.
在隧道开挖的循环爆破过程中，预留的围岩会承受不可挽回的损伤累积。为了安全的隧道施工，了解爆破动力累积岩石损伤的特征是至关重要的。本文应用了声波测试和数值模拟方法进行研究。采用 JH-2 模型作为围岩的损伤模型。基于 ABAQUS 软件求解器之间的数据传递方法，计算了累积损伤。结合声波测试结果，得出了损伤特征。根据研究结果，整个预留围岩具有周期性的损伤特征。每个周期性损伤区域在隧道的纵向方向上呈漏斗形，长度为 160cm，是开挖进尺的 1.07 倍。后续开挖进尺对前一进尺的围岩损伤区域的爆破效果为 40cm 长，具有三种累积损伤模式。这三种累积损伤模式更清晰地揭示了围岩的附加损伤规律，距离后续开挖进尺 5-20cm 处的附加损伤程度最大。本研究可为台阶法爆破施工隧道的爆破方案和衬砌设计提供适当的理论指导。
