Experience of application of polyurethane and phenolic resins in roadheading in fractured and heavily disintegrated rock mass

The problem of mining and ground support in an unstable rock mass under stoping is discussed. The analysis of the experience gained in application of phenolic and polyurethane resins to fill domes-like voids and for preventive consolidation and roadheading in disintegrated rock mass is presented. The feasibility to fill domes formed under roof caving with Blockfil phenolic resin in combination with grouted bolting and the use of Blockpur polyurethane resin for consolidation of disintegrated rocks is investigated. The laboratory test results on strength properties and time of polyurethane resin flowability loss are presented. The procedures are developed for eliminating accidents due to dome formation under roof and sidewalls collapse, as well as for the support of weakened roadways by yielding steel arcs. It is emphasized that geotechnical conditions worsen due to dome formations during recovery works in mines.