1. R. Q. Huang, Geohazard Assessment of the Wenchuan Earthquake (in Chinese) (Science Press, Beijing, 2009), pp. 1–5.
2. Y. P. Ying, Hydrogeol. Eng. Geol. 27, 8 (2000).
3. M. J. Hu, Q. G. Cheng, and F. W. Wang, Chin. J. Rock Mech. Eng. 28, 138 (2009).
4. B. Andreotti, Y. Forterre, and O. Pouliquen, Granular Media: Between Fluid and Solid (Cambridge University Press, Cambridge, 2013), pp. 3–7.
5. Q. C. Sun, M. Y. Hou, and F. Jin, Physics and Mechanics of Granular Matter (Science Press, Beijing, 2011), pp. 242–265.