doi:10.16186/j.cnki.1673-9787.2023060044

Received:2023-06-19

Revised:2023-08-15

Online Date: 2023-10-12

Optimization of parameters of excavation support and down-section blasting inlimestone ore pass(Online)

NIU Shuai1, LIU Shaowei1, FAN Kesong2, LI Xiaopeng1, GUO Zezheng1

1.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan  454000，China；2.School of Mechanical and Power Engineering，Henan Polytechnic University，Jiaozuo，Henan  454000，China

Abstract:"Ore storage drawdown method " is a method of drawdown of chute which extends along with openpit mining in open-pit mine.Maintaining the stability of the shaft wall of a chute is an important link in the production process，but the internal state of the chute is invisible.Based on a limestone mine chute，the technical means of numerical simulation，theoretical analysis and field practice are used to analyze the shaft wall stability under different support conditions after the chute excavation and multiple blasting downgrades， reveals the stress distribution and shaft wall failure law after tunneling and blasting in falling section，and determines the more reasonable supporting conditions. It provides a theoretical basis for the safety of blasting down section. The research shows that the C40 grade concrete support at the wellhead of the limestone mine can effectively weaken the damage to the wellhead surrounding rock caused by the vibration produced

Key words:chute;descending section;blasting reference;wellhead support;wall stability

CLC: TD353;TD235