Formation Mechanism and Control Technology of an Excavation Damage Zone in Tunnel-Surrounding Rock

被引：5

作者：

Fu, Hongxian ^{[1
,2
]}

Guan, Xiaoming ^{[3
]}

Chen, Chun ^{[4
]}

Wu, Jianchun ^{[4
]}

Nie, Qiqiang ^{[4
]}

Yang, Ning ^{[3
]}

Liu, Yanchun ^{[3
]}

Liu, Junwei ^{[3
]}

机构：

[1] Beijing Jiaotong Univ, Key Lab Urban Underground Engn, Minist Educ, Beijing 100044, Peoples R China

[2] Beijing Jiaotong Univ, Coll Civil Engn, Beijing 100044, Peoples R China

[3] Qingdao Univ Technol, Coll Civil Engn, Qingdao 266520, Peoples R China

[4] 3 Construct Co Ltd, China Railway Engn Grp 10, Hefei 230031, Peoples R China

来源：

APPLIED SCIENCES-BASEL | 2023年 / 13卷 / 02期

基金：

中国国家自然科学基金;

关键词：

tunnel blasting; loosened rock circle; acoustic method; nonelectronic detonators; electronic detonator; control technology; VIBRATION;

D O I：

10.3390/app13021006

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Loosened rock circle is formed around the tunnel when the tunnel is constructed by the drilling and blasting method. The size of the loosened rock circle around the tunnel and the degree of internal rock fragmentation has an important influence on the support parameters, durability, and safety of the tunnel. Firstly, referencing an existing tunnel project, blasting tests using nonelectronic and electronic detonators were carried out to determine the influence of blasting construction on the scope of the rock loose circle and the degree of rock fragmentation. Then, a numerical simulation was used to study the contribution of the blasting impact and surrounding rock stress redistribution on the loosened rock circle around the tunnel. The results showed that the range of the loosened rock circle around the tunnel generated by the normal blasting of nonelectronic detonators was 1.5 similar to 2.3 m, and the wave velocity of the rock mass in the loosened rock circle around the tunnel decreased to 23 similar to 36%. The size of the loosened rock circle around the tunnel generated by the blasting impact was 0.66 m, accounting for 33% of the range of the loosened rock circle around the tunnel. The range of the loosened rock circle around the tunnel produced by electronic detonator blasting was 0 similar to 1.4 m. The wave velocity of the rock mass in the loosened rock circle around the tunnel decreased to 12 similar to 17%. The range of the loosened rock circle around the tunnel was approximately 60 similar to 76% of that of detonator blasting, and the broken degree of the surrounding rock in the loosened rock circle around the tunnel was small. The research results can provide a reference for the optimization design of preliminary support parameters of tunnels, such as anchors and steel arches in blasting construction.

引用

页数：16

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