Partitioned rock breaking and pressure relief method for strong rockburst tunnel surrounding rock based on carbon dioxide fracturing blasting

• Main Authors: MENG HAILI, GUO YUNLONG, LIU YIWEI, SON CHOI-WON, KANG YONGQUAN, YANG NIANHUA, XUE LI
• Format: Patent
• Language: Chinese; English
• Published: 08.07.2022
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; MINING OR QUARRYING; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS; SHAFTS; TUNNELS

A zoning rock breaking and pressure relief method for strong rockburst tunnel surrounding rock based on carbon dioxide fracturing blasting comprises the following steps that (1) carbon dioxide pressure relief blasting parameters are determined based on the zoning fracturing law of deep surrounding rock; (2) drilling a circle of pressure relief blast holes in the inclined front direction of the tunnel face according to design parameters after the blast holes are excavated in the tunnel face; (3) filling a carbon dioxide fracturing pipe, filling, connecting a detonating network and detonating, wherein the process and the tunnel drilling and blasting process are synchronously carried out; and (4) blasting pressure relief is carried out 2-3 cycles ahead, so that the current cycle of the tunnel face is always in a low-stress area. The invention belongs to a deep tunnel strong rockburst section surrounding rock stress active release method, and solves the problems that the existing blasting pressure relief construc