【摘要】 软弱夹层是岩体中的薄弱部位,其动力响应问题是岩体工程稳定性分析中的一个重要问题。但是,以往对其动力响应的研究大多是采用数值模拟方法,基于应力波传播理论的解析方法应用不多,而且多局限于层状介质中的SH标量波。软弱夹层通常较薄,厚度比入射波波长小,其动力响应问题更接近于波场散射问题,忽略夹层内部反射波的波传播模型不再成立。为此,提出一种考虑夹层内一次反射波的动力响应模型,并以平面P波为例,给出了一个薄弹性软弱夹层的动力响应模型,分析其动力响应的一般特征。该模型物理概念清晰、算法简单实用,尤其适用于层状介质的动力响应问题,对充填贯通型节理岩体动力学特性的研究有借鉴作用。更多还原

【Abstract】 Because of weak strength of soft interlayers,it is noted that rock dynamic stability caused by soft interlayers should be calculated and analyzed.However,dynamic stability analyses have been performed based on numerical simulation,but not on analytical algorithm ever before.Even if there are a few analytical methodologies,most of them are mainly used for SH wave propagating in hierarchical layers.Generally speaking,the thickness of the soft interlayer is much smaller than that of its surrounding layers;and it is shorter than the seismic wavelength.So its dynamic response model would be a scattering model rather than a direct transmission model.It is obviously reasonable that the interbedded reflecting waves should be considered.On the basis of this idea,the dynamic response model for the thin soft interlayer is put forward,which is used for a corresponding computational example.更多还原