节理岩体中爆炸应力波传播规律的研究

摘要

In order to study the explosive stress wave propagation in rock mass,the finite element model was built based on ABAQUS / EXPLICIT software,in which the ricker wavelet was used as the explosion source. The numerical result illus-trates the feasibility of using ricker wavelet as an explosion source in the simulation of explosive stress wave propagation com-pared with dynamic photo-elastic experimental results. The result shows that:under the action of explosive stress wave, the stress in rock media presents three stress state with time order:the compression-shear stress field induced by radial compression stress and tensile tangential stress;the tensile-shear stress field composed of a combination of radial tensile stress and tangen-tial tensile stress;the tensile-shear stress field formed by radial tensile stress and tangential tensile stress. Strong stress concen-tration has formed under the stress superposition the reflection and diffraction waves generated after crossing the open joint and explosion stress wave,and blast-induced wing crack eventually initiates and propagates at the both ends of the joint.%为了研究爆炸应力波在岩体中的传播过程，建立了基于ABAQUS/EXPLICIT的有限元数值模型，采用ricker子波作为爆炸场源，并将得到的数值结果与现有文献相比较，充分说明了采用ricker子波作为爆炸源模拟爆炸应力波传播问题的可行性。研究结果表明：炸药起爆后，按照时间顺序，岩体中先后呈现3种应力状态，即径向压应力与环向压应力形成的复合压剪应力场、径向拉应力与环向拉应力形成的复合拉剪应力场、径向压应力与环向拉应力形成的复合拉剪应力场。爆炸应力波在节理两端产生的反射波和衍射波与爆炸应力波的相互叠加使节理两端的应力显著增强，并最终促使爆生翼裂纹从节理两端起裂扩展。