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Fracture mechanism of rock around a tunnel-shaped cavity with interconnected cracks under blasting stress waves
International Journal of Impact Engineering ( IF 5.1 ) Pub Date : 2021-08-08 , DOI: 10.1016/j.ijimpeng.2021.103999
Xiaohan Li 1 , Zheming Zhu 2 , Meng Wang 2 , Dingjun Xiao 3 , Yun Shu 1 , Shuai Deng 1
Affiliation  

The existence of cracks in the surrounding rock significantly affects tunnel stability under dynamic disturbances. To study the fracture mechanism of tunnels in fractured rock masses under blasting stress waves, a new specimen, i.e., the specimen with a tunnel-shaped cavity and interconnected cracks (TCIC), was proposed in this paper. Using these specimens, blasting tests were conducted. The crack propagation data were monitored by crack propagation gauges (CPGs) and strain gauges (SGs). The Riedel-Hiermaier-Thoma (RHT) model was used to perform equal-scale numerical simulations on TCIC specimens. The stress distribution and fracture modes around the tunnel in a fractured rock mass under blasting stress waves were characterised. The results show that the interconnected cracks have an important influence on the dynamic response of the tunnel under blasting stress waves. The stress distribution around the tunnel remarkably changes due to the existence of the interconnected cracks, resulting in the initiation and propagation of these cracks, but there is no fracture on the tunnel boundary. The dynamic crack propagation behaviours are influenced by the incident direction of the blasting stress wave. The crack propagation velocity in the front blasting side of the tunnel is higher than that in the back blasting side. The research results are significant to the analysis of tunnel stability and the support design.



中文翻译:

爆破应力波作用下隧道状空腔周围岩石的破裂机理

围岩裂缝的存在显着影响动力扰动下隧道的稳定性。为研究爆破应力波作用下裂隙岩体中隧道的断裂机理,提出了一种新的试件,即具有隧道形空腔和互连裂缝的试件(TCIC)。使用这些试样进行爆破试验。裂纹扩展数据由裂纹扩展仪(CPG)和应变仪(SG)监测。Riedel-Hiermaier-Thoma (RHT) 模型用于对 TCIC 标本进行等尺度数值模拟。表征了爆破应力波作用下破裂岩体中隧道周围的应力分布和破裂模式。结果表明,在爆破应力波作用下,相互连接的裂缝对隧道的动力响应有重要影响。由于存在相互连接的裂缝,隧道周围的应力分布发生显着变化,导致这些裂缝的萌生和扩展,但隧道边界处没有断裂。动态裂纹扩展行为受爆破应力波的入射方向影响。隧道前爆破侧的裂纹扩展速度高于后爆破侧的裂纹扩展速度。研究成果对隧道稳定性分析和支护设计具有重要意义。导致这些裂纹的萌生和扩展,但隧道边界上没有断裂。动态裂纹扩展行为受爆破应力波的入射方向影响。隧道前爆破侧的裂纹扩展速度高于后爆破侧的裂纹扩展速度。研究成果对隧道稳定性分析和支护设计具有重要意义。导致这些裂纹的萌生和扩展,但隧道边界上没有断裂。动态裂纹扩展行为受爆破应力波的入射方向影响。隧道前爆破侧的裂纹扩展速度高于后爆破侧的裂纹扩展速度。研究成果对隧道稳定性分析和支护设计具有重要意义。

更新日期:2021-08-19
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