基于FLAC~(3D)模拟的深部岩体爆破损伤规律研究

在高应力和爆炸载荷共同作用下,深部岩体的损伤和破坏将是一个复杂的动态演化过程。为了对深部岩体爆破损伤破坏的机理及影响因素进行深入细致的研究,利用FLAC3D非线性动力分析手段对不同爆炸峰值应力、不同加载速率及不同静应力对岩体爆破损伤量的影响进行研究,同时探讨了爆破损伤破坏区域随动态加载时间的扩展规律,以定性和定量的方式对爆炸后损伤区进行分析和评估。研究表明:不同峰值应力主要影响应力波上升阶段岩体损伤区域和损伤量的大小,不同的加载速率主要影响损伤区的发展速度,而不同的静应力主要影响拉伸破坏区域的最终形态及拉伸破坏量。研究为深部岩体爆破开挖设计提供一定参考。

Simulation Study on Blasting Damage Law of Deep Rock Mass Based on FLAC3D

Under the combined action of deep high stress and blasting load,the damage of deep rock mass will be a com-plicated dynamic evolution process. In order to study the mechanism and influencing factors of deep rock blasting damage,the effects of different explosive peak stress,loading rate and static stress on the size of blasting damage were studied by FLAC3D nonlinear dynamic analysis method. The propagation rule of blasting damage zone with dynamic loading time is discussed,and the size of damage area after blasting is analyzed and evaluated in qualitative and quantitative way. The results show that the different peak stress mainly affects the damage area and the damage amount of the rock mass in the rising stage of the stress wave. The different loading rate mainly affects the development speed of the damage area,and different static stresses mainly af-fect the final form of the tensile failure zone and tensile damage. The study provides some reference for the design of deep rock blasting excavation.