Excavation-induced microseismicity and rockburst occurrence in deep underground projects provide invaluable information that can be used to warn rockburst occurrence, facilitate rockburst mitigation procedures, and analyze the mechanisms responsible for their occurrence. Based on the deep parallel tunnels with the maximum depth of 1890 m created as part of the Neelum-Jhelum hydropower project in Pakistan, similarities and differences on excavation-induced microseismicity and rockburst occurrence between parallel tunnels with soft and hard alternant strata are studied. Results show that a large number of microseismic (MS) events occurred in each of the parallel tunnels during excavation. Rockbursts occurred most frequently in certain local sections of the two tunnels. Significant differences are found in the excavation-induced microseismicity (spatial distribution and number of MS events, distribution of MS energy, and pattern of microseismicity variation) and rockbursts characteristics (the number and the spatial distribution) between the parallel tunnels. Attempting to predict the microseismicity and rockburst intensities likely to be encountered in subsequent tunnel based on the activity encountered when the parallel tunnel was previously excavated will not be an easy or accurate procedure in deep tunnel projects involving complex lithological conditions.

开挖引起的深部地下工程引起的微地震和岩爆的发生提供了宝贵的信息，可用于警告岩爆的发生，促进岩爆的减灾程序并分析造成其发生的机制。基于巴基斯坦Neelum-Jhelum水电项目的最大深度为1890 m的深层平行隧道，研究了软硬交替地层的平行隧道在开挖引起的微地震和岩爆发生方面的异同。结果表明，在开挖过程中，每条平行隧道均发生大量微地震（MS）事件。岩爆最常发生在两条隧道的某些局部区域。在平行隧道之间的开挖引起的微地震（MS事件的空间分布和数量，MS能量的分布以及微地震变化模式）和岩爆特征（数量和空间分布）方面发现了显着差异。在涉及复杂岩性条件的深埋隧道项目中，试图根据先前开挖的平行隧道时遇到的活动来预测随后的隧道中可能遇到的微地震和岩爆强度将不是一个简单或准确的过程。