充填材料对节理岩石动力学性能影响的模拟试验

Simulation material experiment on the dynamic mechanical properties of jointed rock affected by joint-filling material

采用相似材料模拟制作与真实节理岩石性质相同的节理模型试件,通过在大直径(50 mm)分离式霍普金森压杆(SHPB)装置上对人工制作的节理岩石试件进行冲击试验,探究节理充填材料对岩石动态力学性能的影响。试验结果表明:随着充填材料强度的降低,节理试件动态弹性模量降低,动态抗压强度呈指数形式衰减,软材料充填的试件呈现塑性破坏,试件整体破坏形态与充填材料性质相关。能量分析,反射能量比随充填材料强度降低呈增大趋势,透射能量比降低,耗散能量比与充填材料性质相关,由能量表征的损伤变量与冲击速度呈弱幂函数关系,满足d=-0.11v2+1.31v-3.01,试件破坏时的损伤d=0.458。

Joint model specimens were made with similar materials that had the same properties as the real joint rock.The impact experiment was then carried out on the artificial jointed rock specimens with the help of an SHPB test apparatus （50 mm）.Rock dynamic mechanics properties that are affected by the joint filling material were then acquired. It is found that with the strength of the filling material reduced,the joint specimen quantitative dynamic elastic modulus decreases and the dynamic compressive strength attenuates with an index form.The specimens filled with soft material showed plastic deformation and failure,the overall failure pattern of specimens associated with filling material properties. Reflection energy ratio showed an increased trend as the strength of the specimens decreased.Transmission energy ratio reduced.The energy dissipation ratio was associated with the filling material properties.The damage variable and the impact velocity met the function of d =-0.11v2 ＋1.31v -3.01,with a damage value d of 0.458,when the test specimens failed.