Large-scale landslides as a common geological hazard can be easily triggered by natural factors, while it is extremely difficult to be activated by anthropolical blasting operations. The paper presents a comprehensive analysis of characteristics of stress wave propagation in a blasting-triggered large-scale rockslide, termed Wangshan–Zhuakousi Landslide, to investigate the effect of blasting wave on multi-layer interface condition. A detailed analysis of the propagation of P wave in the filling joints was conducted to verify the reliability of the analytical model and the deterioration characteristics of the weak interlayer. The results indicate that the reflection tensile wave can be formed when P wave propagates from the basalt across the tuff interlayer. The theoretical equation for damage assessment of soft rock interlayers is proposed, which can be adopted in calculating the additional stress of soft rock mass in blasting operation. It is found that the material density is the most influential factor in attenuation rate. Besides, the longitudinal wave velocity of materials and the period of incident waves perform the identical effect on the attenuation rate. It is demonstrated that the cumulative failure of tuff layer plays a crucial role in triggering successive sliding. According to the modelling, the tuff interlayer appears to be in a compressed state before the complete damage under P-wave propagation. The locally tensile behaviour can be observed after the complete damage of the tuff. The underlying tuff interlayer forms a discontinuous cumulative damage zone, which significantly triggered major ruptures and destabilized the original bedding rock slope. This paper could prove new insight towards the enforcement of risk assessments and mitigation countermeasures for blasting-induced landslide.

中文翻译：

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灾难性大型顺层滑坡中冲击波传播的数值研究

大型滑坡是一种常见的地质灾害，自然因素容易引发，而人为爆破作业则极难引发。本文综合分析了爆破触发的大型滑坡（称为王山-抓口寺滑坡）中应力波传播的特征，以研究爆破波对多层界面条件的影响。对充填节理中P波的传播进行了详细分析，验证了解析模型的可靠性和弱夹层的劣化特性。结果表明，当P波从玄武岩穿过凝灰岩夹层传播时，可以形成反射张波。提出了软岩夹层损伤评估的理论方程，可用于爆破作业中软岩体附加应力的计算。发现材料密度是衰减率的最大影响因素。此外，材料的纵波速度和入射波的周期对衰减率的影响是相同的。表明凝灰岩层的累积破坏在触发连续滑动中起着至关重要的作用。根据模型，凝灰岩夹层在 P 波传播下完全损坏之前似乎处于压缩状态。在凝灰岩完全损坏后可以观察到局部拉伸行为。下伏凝灰岩夹层形成了不连续的累积损伤带，显着引发了重大破裂，破坏了原始顺层岩质边坡的稳定性。