Advances in rock-support and geotechnical engineering / Достижения в области крепления горных пород и геотехнического проектирования

In China, numerous shallow mined-out areas have been left due to the disordered mining by the private coal mines. It is of important theoretical and practical value for the roof stability evaluation and disaster forecasting to research the deformation rupture, instability mechanism, and failure mode of the rock roof in the minedout areas.

The studies on the instability of the rock roof in the mining field have been a main topic both for scholars in China and abroad. For example, according to elastic thin plate theory, Wang et al. (2006) analyzed the fracture instability characteristics of the roof under different mining distances in the mining work face. Wang et al. (2008a) analyzed the rheological failure characteristics of the roof in the mined-out areas through combining the thin plate and rheology theories. Pan et al. (2013) had conducted the analytical analysis of the variation trend of the bending moment, the deflection, and the shear force of the hard roof in the mining field. This research is inclined to adopt traditional analytic methods to probe into the roof stability. New theories and methods have been used in recent years. Zhao et al. (2010) utilized the catastrophe theory to set up vertical deformation model of the overlapping roof in the mined-out areas, and put forward the criteria for evaluating the roof stability.

Wang et al. (2013c) analyzed the chaos and stochastic resonance phenomenon produced in the roof during the evolutionary process of the rock beam deformation. Meanwhile, some numerical computation methods were applied in discussing the mechanical response of rock plate or beam. Wang et al. (2008a) analyzed the blast-induced stress wave propagation and the spallingdamage in a rock plate by using the finite-difference code. Nomiko et al. (2002) researched the mechanical response of the multijointed roof beams using two dimensional distinct element code. Mazor et al. (2009) examined the arching mechanism of the blocky rock mass deformation after the underground tunnel being excavated using the discrete element method. Cravero and Iabichino (2004) discussed the flexural failure of a gneiss slab from a quarry face by virtue of linear elastic fracture mechanics (LEFM) and finite element method (FEM). <...>