Numerical studies on dynamic friction mechanism of blocky rock system using manifold method
When a dynamic pulse loading is applied to the top of a blocky rock system, the frictional force between the blocks in the lateral direction can be reduced significantly or even disappear, which is known as an ultra low friction phenomenon. This phenomenon has drawn a lot of attentions of researchers. However, it has not been well understood because of its complexity. In this paper, the dynamic friction mechanism of blocky rock system is numerically investigated using manifold method. The parametric studies with respect to loading duration, loading intensity and loading shape of the pulse have been carried out. Numerical results indicate that the loading duration has a great influence on the frictional force between two blocks. When the loading frequency is around the natural frequency of the blocky rock system, the frictional force will be severely reduced. Loading intensity favors the reduction of the frictionai forces. Larger loading intensity will lead to lower frictional force. Loading shape also has some influences on the frictional force because of different energy involved in each loading. The ultra low friction phenomenon has been discussed based on the numerical simulation results. It is due to the vibration of the blocky rock system induced by the applied pulse loading.
Dynamic friction mechanism Blocky rock system Frictional force Ultra low friction phenomenon Manifold method
G.W.MA X.M.AN M.Y.WANG
School of Civil and Environmental Engineering, Nanyang Technological University, SINGAPORE 639798 Engineering Institute, PLA University of Science and Technology,Nanjing, CHINA 210007
国际会议
北京
英文
221-225
2007-08-14（万方平台首次上网日期，不代表论文的发表时间）