Dynamic response of rock mass during split Hopkinson pressure bar test:numerical simulation utilizing distinct element method
Dynamic responses of rock mass subject to high strain rate loadings by Split Hopkinson Pressure Bar(SHPB)tests were analyzed utilizing distinct element method in the present paper.In order to investigate the discontinuum of the rock mass,a numerical SHPB test model based on two-dimensional Particle Flow Code(PFC2D)was established.Two approaches with regular and random assemblies for incident and transmitted bars were compared to account for dispersion caused by inertial effect.Additionally,the relationships between strain rate and peak strength were studied and the rate-sensitive behaviors were analyzed.The distinct element method implemented in Particle Flow Code provides an effective approach to observe microcracks evolution,failure process and stress wave propagation; this model also can be extended to higher strain rate tests such as more than 103,104 and so on.Furthermore,the effects of joint parameters such as locations,directions,contact areas,as well as stiffness,are investigated and attempts are made to shed light on macroresponse with respect to discontinuum of rock mass,the results identify that the joints are closely related to failure modes,stress wave propagation and dynamic response of rock mass.
X.F.Li H.B.Li J.C.Li X.Xia
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China
国际会议
The 12th International Conference on Analysis of Discontinuous Deformation(第12届非连续变形分析国际大会)
武汉
英文
75-84
2015-10-16（万方平台首次上网日期，不代表论文的发表时间）