Study of global deformation and control of a thick, layered compound roof in a deep well
Abstract：The mechanical deformation of a thick, compound roof in a deep hole was analyzed to solve the global problem of rock deformation. Field surveys and theoretical research on thick, compound roof structures addressed the main causes of global deformation. These very thick roofs have low mechanical strength and multiple, weak layers within them. The effective length of the anchors did not reach into the stronger part of the rock. Three primary zones of deformation include the caving zone, the cracking zone within the separated strata when sag- ging appears, and a circular instability involving the roof and both sides or the roof and small pillars. A truss anchor beam method of control is presented. Field tests monitoring an installed restraint show that this technology, with its highly stiff truss anchor beams, provide better support than the original bolt and anchor method. The observed deformation is 541 mm less than with the original support method.
Keywords：coal roadway in deep wellthick layer compound roofdeformation mechanism
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 725-732 )