夹层非均匀分布的块系岩体摆型波传播规律

岩体是具有离散性、非均匀性特征的复杂地质体,在这种离散性、非均匀性岩体中会出现摆型波现象,极易引发深部岩体工程灾害。针对岩体的离散性、非均匀性特征,基于岩体等级块系构造理论,研究夹层物理性质非均匀分布对块系岩体摆型波传播规律的影响,分析同一区域夹层黏弹性特性变化对不同区域块体动力响应的影响,以及不同区域夹层黏弹性特性变化对同一块体动力响应的影响。研究发现:当局部软弱夹层弹性系数减小时,与该部分相连接的块体的动力响应受影响较大,出现加速度峰值增大的现象;局部软弱夹层黏弹性特性变化时,对该部位前后位置的块体动力响应的影响是不同的;夹层弹性或黏性发生变化的位置对摆型波传播具有重要影响,黏弹性变化位置越靠前,对块系岩体动力响应的影响越强烈。根据以上分析结果提出对深部岩体工程有指导作用的建议,也为进一步研究离散、非均匀的复杂深部岩体动力现象提供参考。

Study on the Propagation Law of Pendulum-type Wave of the Block Rock with Heterogeneous Interlayer Distribution

The rock mass is a complex geological body with the characteristics of discretion and heterogeneity, In this rock mass the characteristics of discretion and heterogeneity, the phenomenon of the pendulum-type wave will occur, which will easily lead to deep rock engineering disasters. According to the characteristics of discretion and heterogeneity of deep rock mass, the influence of the heterogeneity distribution of interlayer physical properties on the propagation of the pendulum-type wave is studied based on the block-hierarchical theory of deep rock mass. The influence of viscoelastic change of interlayer in the same region on the dynamic response of block in different regions and the influence of viscoelastic change of interlayer in different regions on the dynamic response of block in the same region are analyzed. According to the results,when the elasticity of the local weak interlayer decreases, the dynamic response of the block connected to the part is greatly affected by the elastic change, and the peak of acceleration increases. When the viscoelasticity of the interlayer of the same location changes, the influence of the block dynamic response before and after the location is different. The location of the viscoelastic change of the interlayer has an important influence on the propagation of the pendulum-type wave,the earlier the position of viscoelastic change is, the stronger the influence is on the dynamic response of block rock mass. Based on the above analysis results, the suggestion for guiding the deep rock mass engineering is proposed, which provide a reference for further study of discrete and heterogeneity complex deep rock mass dynamic phenomena.