Study on failure mechanism and bolt-mesh-spray-grouting composite support technique in weakly consolidated soft rock roadway

摘要

The failure mechanism of weakly consolidated soft rock roadway is analyzed. Sensitive rock deformation often occurs in weakly consolidated soft rock roadway, because of poor cementation and low intactness of soft rock. The stepwise and composite support schemes are brought forward by numerical modeling and monitoring. The primary supporting scheme is bolt-mesh-spray and the secondary scheme is grouting-floor rock bolts-floor anchor beam. The results show that the surrounding rock deformations are less than 30 %, and steady time is reduced to 7 days compared to the primary plans.