Publisher's Synopsis
Strata mechanics deals with the prediction and control of strata behaviour during development and extraction operations. It was a widely used term in the mining industry before the development of alternatives, such as geomechanics, rock mechanics and mining geomechanics. It continues to be widely applied in the coal mining industries. Strata Mechanics has made significant contributions in development of the award winning mining methods like - cable bolting based depillaring of thick seams in single lift and wide stall mining. Although large-scale and extensive coal mining can meet ever-growing energy needs, it also causes considerable waste of coal resources and environmental damage. One reason is that the all caving method is applied in dealing with the goaf, causing strata movement and large areas of ground subsidence. Thus, old management of goaf roof at the mining workface must be disrupted to balance the demand for coal mining and the need for ecological protection to achieve sustainable development of coal mines, green mining, and reasonable mining. The effect of controlling strata movement in solid filling mining depends on the filling rate of the goaf. However, the mechanical property of the overburden in the backfill stope and the designed size of the backfill mining workface should also be considered. The research and reviews articles in this volume provide a unified approach to the design of underground structures in stratified coal and mineral deposits. This book focuses on roof strata model with loads in accordance with the theory of key strata to investigate the stability of the overburden in solid dense filling mining. It shows that the position of the long side midpoint of the main roof strata failed more easily because of tensile yield, indicating that this position is the area where failure is likely to occur more easily. We also deduced the stability mechanics criterion of the main roof strata based on tensile yield criterion. As the mining workface advances, solid backfills, such as gangue, would immediately be filled into goaf and fully connect with the roof strata of goaf with the support of the rear ramming structure. Curbing or Mitigating the deformation of the immediate roof, main roof, and overlying strata is possible to avoid immediate roof fracture or fracture but not collapse, while the main roof strata only has bend subsidence.
