应力波在一维节理岩体中传播规律的 试验研究与数值模拟

 在测定撞击载荷形式的基础上，通过试验研究应力波在一维节理岩体中的传播规律。分析完整岩体中各质点的振动形式以及不同形式的撞击载荷下对质点振动的影响，在完整岩体中质点的振动形式很有规律，其振动频率单一，且与一维岩柱的长度有关；分析结构面附近质点的振动特征，试验结果表明结构面附近质点振动有增强现象；还分析结构面组数对应力波传播衰减规律的影响，随着结构面组数的增加，质点振动衰减便快，应力波随距离的衰减也很明显。在块体离散元的基础上，研究多尺度离散元模型，并用它来模拟应力波在节理岩体中的传播规律，取得较好的效果，说明块体离散元适合模拟岩体中应力波的传播衰减规律。

EXPERIMENTAL STUDIES AND NUMERICAL SIMULATION OF STRESS WAVE PROPAGATION IN ONE-DIMENSIONAL ROCK MASS

On the basis of detecting impact load，studies are carried on regulation of stress wave propagation in one-dimensional rock mass by experimental and numerical simulation. These studies include the vibration form of particle in intact rock mass，the effect of different impact loads on particle vibration，the vibration characteristic of particle near discontinuity，and the effect of multi-strip discontinuity on the regulation of propagation and attenuation of stress wave. The experimental results show that the regulation of particle vibration in intact rock mass is obvious，and its vibration frequency is unitary，indicating that the frequency has close relationship to the length of one-dimension rock mass. The experimental results also indicate that the particle vibration near discontinuity is magnified，and it can be attenuated through the crack if the wave length is not larger than the crack width. And with the number of discontinuity increasing，the attenuation of particle vibration is obvious. In addition，the attenuation of stress wave with space increasing is obvious. Multi-scale model of discrete element method is constructed on the basis of primary block discrete element model. The new model is used to simulate the stress wave propagation regulation in jointed rock mass，and is more rational. The result shows that the improved block discrete element model is fitful to simulate the propagation regulation of the stress wave in jointed rock mass.