块系岩体非协调动力响应特征试验研究

岩体在块系构造状态下的动力传播存在块体和块体间软弱介质的非协调变形现象,对岩体结构的动力稳定产生重要影响。目前块系岩体的非协调动力传播响应研究尚不充分,导致不能进行有效的动力响应特征识别。通过试验对块系岩体非协调动力传播过程岩块动力响应特征进行研究,分别从动力传播速度、岩块加速度振幅衰减、岩块振动位移响应、岩块振动持续时间、块体动能显现、块体振动频域响应特性等方面对比纵波传播,给出块系岩体非协调动力传播的特征分析。通过分析可知,块系介质非协调变形运动产生的动力传播现象相比于纵波传播是一种低频低速波,并伴随着岩块的大位移运动,同时岩块振动持续时间较长,蕴含着动能与势能的相互转换过程,这些现象构成了块系岩体非协调动力传播的重要特征。该研究将为识别岩体非协调动力传播特征及块系岩体的冲击预警波动特征识别提供参考。

Experimental study of incompatible dynamic response feature ofblock rock mass

The phenomena of incompatible deformation are observed in the block rock mass on dynamic propagation between blocks and block partings composed of the weak medium. The dynamic incompatible deformation influences the stability of the block rock mass. At present, the studies of characteristics response of block rock mass incompatible deformation are limited, which induced the difficulty to recognize this dynamic phenomenon. In this paper, the characteristics of the incompatible dynamic response of block rock are studied through experiments. The incompatible deformation characteristics of block rock mass are analysed. The velocity of dynamic propagation, attenuation of block acceleration amplitude, displacement of block rock vibration, duration time of block vibration and kinetic energy of the block, the frequency response of blocks are analyzed on the dynamic propagation in the block rock mass. Compared with the longitudinal wave, incompatible deformation dynamic propagation in the block rock mass is low-frequency and slow-velocity wave. When block rock mass has incompatible deformation, the vibration displacement of block rock and vibration duration time are increased. In this process, it contains conversion between kinetic energy and potential energy. These phenomena are critical characteristics to recognize the incompatible deformation dynamic propagation. This study provides the reference for the recognition of incompatible dynamic propagation in the block rock mass and wave warning of block rock mass on impact response.