1. Bai S (2015) Kuqa piedmont region drilling resistance characteristics and bit drilling optimization technology research. Yangtze University, Jingzhou
2. Boyum BH (1961) Subsidence case studies in Michigan mines. In: Symposium on Rock Mechanics. University Park, Penn., USA, pp 19–57
3. Bratton J, Pratt H (1968) Two-dimensional finite difference calculations of dynamic in-situ response of layered geologic media to a large explosive load. In: The 10th U.S. Symposium on Rock Mechanics (USRMS). ARMA, Austin, Texas, pp 149–198
4. Cundall PA, Hart RD (1992) Eng Comput 9:101–108
5. Cundall PA, Strack ODL (1979) A discrete numerical model for granular assemblies. Geotechnique 29:47–65