爆炸应力波在层状节理岩体中传播规律及数值模拟

为了得到爆炸应力波在层状节理裂隙岩体中的传播与能量衰减规律,以便更好地研究围岩结构动力稳定性,以凤凰山铁矿为研究背景,建立了2种巷道模型:一种在巷道上方预设2个平行的水平节理,另一种不含节理。通过进行相似理论与试验研究和FLAC^3D数值模拟软件的非线性动力反应对比分析,在输入爆破荷载后,分析在不同时刻和位置时,完整岩体的地质力学模型和节理岩体的地质力学模型的爆炸应力波质点速度。结果表明:爆炸应力波在节理岩体中的衰减比在完整岩体中的衰减快;在同一质点处,各方向上的衰减各不相同,并且2种方法的结果几乎相同。研究成果为爆破应力波规律的把握和对巷道进行支护提供了重要的理论依据。

Blasting Stress Wave in Layered Jointed Rock Mass:Propagation Law and Numerical Simulation

In an attempt to better research the dynamic stability of surrounding rock structure,the rules of propaga-tion and energy attenuation of blasting stress wave in layered jointed rock mass were obtained. With Fenghuangshan iron ore as a research background, geomechanics models of roadway were established in line with the similarity principle:one jointed rock mass with 2 parallel horizontal joints on top of roadway,and one intact rock mass contai-ning no joint. With the vibration waveform curve as the input frequency of vibration load,the particle velocities of blasting stress wave at different instances and positions of jointed rock mass model and those of intact rock mass model were compared between model test and FLAC3Dnumerical simulation. Model test results are in good agree-ment with computation results:the attenuation of blasting stress wave in jointed rock mass is faster than that in in-tact rock mass; at the same particle position, the attenuation varies in different directions. The present research serves as an important theoretical basis for obtaining blasting stress wave law and roadway support.