YU J X, LI Z Z, GUO M,et al.Study on the influence of vertical shaft blasting with frozen clay on the vibration of shaft wall[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(1):26-34.

doi:10.16186/j.cnki.1673-9787.2021070022

Received:2021/07/05

Revised:2022/01/20

Published:2023/01/25

Study on the influence of vertical shaft blasting with frozen clay on the vibration of 

shaft wall

YU Jianxin1, LI Zhenzhen1, GUO Min2, ZHANG Yingcai1

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Second Bureau the Second Construction Company Ltd. of China Construction，Zhengzhou  450000，Henan，China

Abstract:When the vertical shaft excavation is constructed by freezing technology，the frozen clay blasting will have a vibration effect on the shaft wall，and it is easy to cause rupture of shaft wall，resulting in safety accidents.Taking the frozen clay blasting excavation project of Zhaogu No.2 Mine as the research background，the ANSYS/LS-DYNA numerical simulation software was used to establish the model，the influence of blasting vibration on shaft wall under different cutting dosage，ground stress conditions and the number of hollow holes was studied.The results showed that the vibration velocity of shaft wall measuring points was proportional to the cutting dosage.The cutting dosage increased by 4 times from 16 kg to 64 kg，and the vibration velocity of the shaft wall measuring points increase by 3.67 times from 9.53 cm/s to 35 cm/s.Hollow hole could weaken the influence of blasting impact load on the vibration of the shaft wall，and the vibration velocity of the shaft wall was inversely proportional to the radius of the hollow hole.When the ground stress varies from 1 MPa to 3 MPa，the vibration velocity of shaft wall was proportional to the ground stress.Numerical simulation analysis under field blasting scheme showed that the stress wave produced by frozen clay blasting was mainly transmitted along the vertical shaft wall when millisecond delay blasting of 1，3，4 and 5 segments of electric detonator was adopted.The blasting of four auxiliary holes had the most significant effect on the vibration of the shaft wall，which was about 3.5 times of that of the five surrounding holes.At 13.3 m away from the working face，the maximum tensile stress produced by the four auxiliary holes was 0.425 MPa，which had no destructive effect on the concrete structure of the shaft wall.The analysis methods and research results could provide reference for frozen clay blasting construction of deep shaft under the same type of conditions.

Key words:frozen clay blasting;Zhaogu No.2 Mine;shaft wall;blasting vibration;numerical simulation

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