【摘要】 为了模拟岩体中软弱夹层对爆炸波传播衰减的影响,在块体离散元的基础上改进了数值计算方法(包括基本方程、求解步骤、能量耗散等效模式),使其适合模拟爆源的特点、岩体中软弱夹层的性质以及应力波的传播衰减规律.用该方法建立了含软弱夹层岩体和爆源的数值模型,对岩体中软弱夹层影响爆炸波的传播衰减规律进行了数值试验.结果表明:软弱夹层前后爆炸波的振动速度峰值差别很大,存在量级上的差别;软弱夹层与爆源的距离对应力波衰减的影响很大,而夹层厚度影响较小;在两组软弱夹层之间的质点振动持续时间明显延长.数值模拟不仅给出了爆炸波经过软弱夹层的透反射关系,而且描述了不同情况下质点振动的基本形式,可为实际工程提供参考.更多还原

【Abstract】 In order to simulate the influence of the weak interlayer in rock mass on the propagation attenuation of blast wave,the numerical calculating method including the basic equations, solution procedures and equivalent modes of energy dissipation was improved on the basis of block discrete element. The improved method will fit to simulate the characteristics of explosion source,properties of weak interlayer in rock mass and propagation attenuation rule of stress wave. The numerical models of both rock mass containing weak interlayer and explosion source were established with the improved method. And the numerical tests were carried out for the influence of the weak interlayer in rock mass on the propagation attenuation of blast wave. The results show that the difference in vibration velocity peak on both sides of weak interlayer is considerably great. The distance between the weak interlayer and explosion source has the large influence on the attenuation of stress wave,while the thickness of weak interlayer has a little influence on it. In addition,the duration of particle vibration between two group of weak interlayers becomes longer significantly. The numerical simulation not only gives the transmission and reflection relationship of blast wave passing through weak interlayer,but also represents the basic forms of particle vibration in different cases,which may provide a reference for practical engineering.更多还原