in advance longwall mining, the safety of mine network, production rate, and consequently, economic conditions of a mine are dependent on the stability conditions of gate roadways. the gate roadway stability is a function of two important factors: 1) characteristics of the excavation damaged zone (edz) above the gate roadway and 2) loading effect due to the caving zone (cz) above the longwall w...

Abstract For most of the twentieth century, welfare state was predominantly understood as a national project. In recent years, however, it has been recognized that other political levels — both sub- and supranational have profound impact on design delivery social- labour market policies programmes. This article looks more closely at sub-national level. this domain, bodies, such municipalities r...

The paper describes R&D project results on justification of a new approach to the induced caving ore using convergent geotechnologies. In this case, optimized conditions are created for self-caving in block-structure rock mass based evaluated limiting exposed span using, among other things, Mathews–Potvin stability graph. design solutions include formation density discontinuity form v...

When using the explicit dynamic relaxation approach (DRA) to model quasi-static rock breakage, fragmentation, and flow problems, especially top-coal caving question, introducing numerical damping into solution equation is inevitable for reducing vibration frequency impact speed of mesh nodes, which significantly affect fidelity computation results. Although DRA has been widely adopted simulate ...