Shuheng Du State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China;
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, P. R. China China
Tao Hu State Key Laboratory of Petroleum Resources and Engineering, Beijing 102249, P. R. China;
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, P. R. China China