Numerical Simulation of Deformation and Failure of Drainage Boat Pond Caused by Underground Coal Mining-Induced Subsidence

Table 2

Physical and mechanical parameters of strata in 11301# coalface.

Lithology	Modulus of elasticity/MPa	Compressive strength/MPa	Poisson’s ratio	Internal friction angle/°	Bulk density/kg/m^3
Drainage boat pond	10000	100	0.28	35	7.5^-5
Reinforcement area around drainage pond	7500	60	0.25	30	2.5^-5
Loose layer	2500	20	0.25	30	2.5^-5
Sandstone	3200	46	0.26	35	2.4^-5
Igneous rock	3800	85	0.35	27	2.4^-5
Sandstone	3200	46	0.26	35	2.4^-5
Conglomerate mudstone interbeded	3600	40	0.23	30	2.6^-5
Sand and mud interbeded	5000	20	0.25	38	2.6^-5
Coal seam	1500	15	0.23	29	1.5^-5
Floor	3500	40	0.25	32	2.5^-5