| Abstract: | The influence exerted by depth of seam mining on the displacements of rocks and the formation of zones of tensile stresses is studied. Results are presented for the analytical and numerical solution of corresponding problems of geomechanics, on the basis of which regularities governing the subsidence of the daylight surface, roof deflection, and floor rise, and variations are also established for the parameters defining zones of vertical and horizontal stresses above the working. The boundaries of shallow depths in relation to the span length of working with hanging up roof are determined where regularities of the undermined strata displacement and stress distribution differ in essence from corresponding regularities at great depths. Institute of Problems of Complex Development of Bowels, Russian Academy of Sciences, Moscow. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 5–11, May–June, 1999. |
