Effects of dynamic loading on the mobility of rock-fall
This study analyses the effects of dynamic load on mobility character of rock-fall using discontinuous deformation analysis(DDA).A vast number of cases have demonstrated that seismic loading plays an important role in mobility character of rock-fall,but which factor plays a major role is still unknown.In order to figure out the problem,a rock-fall model is developed and a test scheme is established based on the orthogonal test theory.The ground motion is so complex that it is impossible to solve the issue once for all and to simplify the issue,harmonic wave is taken as dynamic load wave.The scheme considers three important factors including amplitude,frequency and duration of dynamic load and the kinetic energy at the bottom of slope is chosen to be the evaluation index.Mobilities of rock-fall under different conditions are simulated by a dynamic discrete numerical analysis method called DDA and the test results are analyzed by means of range,variance and regression analysis.The results prove that different factors have different effects on the kinetic energy of rock-fall at the bottom of slope.It is shown that among the three influential factors,amplitude is the most significant one,followed by duration and frequency and the kinetic energy of rock-fall at the bottom of slope has a linear correlation with the amplitude.To stop potential unstable rock mass under seismic loading,these research findings provide proof to determine the impact and movement distance,which has a practical significance to the prevention of slope geo-hazard.
Xiaofu Huang Yingbin Zhang John X.Zhao Pengcheng Yu Jinmei Wang
School of Civil Engineering, Southwest Jiaotong University, Chengdu, China Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong Unive
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
132-138
2015-10-16（万方平台首次上网日期，不代表论文的发表时间）