Stepwise Support Technology for Extremely Soft Rock Roadway and Its Engineering Application

摘要

Based on the stepwise strain features and the strength reduction law of the surrounding rock in extremely softrock roadway, this paper proposes a dynamic supporting principle. Anew kind of stepwise reinforced technology, which consists of immediate shotcreting, timely bolting and delay grouting, was optimized after thorough analysis and illustrated with a successful engineering example in extremely difficult softrock roadway.