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Safety Analysis of Lining Structure Influenced by Blasting of Tunnel with Extralarge Section and Small Space
Shock and Vibration ( IF 1.6 ) Pub Date : 2020-11-18 , DOI: 10.1155/2020/8852702
Xuwei Zhao 1 , Keguo Sun 1 , Weiping Xu 1 , Li Tang 1 , Haisu Wang 1 , Yiqin Hong 1
Affiliation  

In order to ensure the safety of the Daling tunnel with extralarge section and small space, the three-dimensional model of blasting dynamic simulation had been established and verified. Then, the model was used to analyze the influence of the surrounding rock characteristics and blasting design parameters on the blasting vibration of the first hole, and the analysis of the sensitivity of each factor was carried out. The results showed that blasting of the second hole had a serious impact on the safety of the first hole lining structure. Based on the safety threshold and analysis of sensitivity, the explosive velocity, charge density, and digging length were selected as the key parameters affecting the safety of the tunnel structure. Meanwhile, the corresponding engineering measure was taken based on the results of sensitivity and the actual situation on site, and, after that, the maximum PPV of the right wall of the first hole had been reduced to 9.3 cm/s, which effectively guaranteed the safe construction of the tunnel.

中文翻译:

大断面小空间隧道爆破影响衬砌结构的安全性分析。

为了保证大断面小空间大岭隧道的安全,建立并验证了三维爆破动力学模拟模型。然后,利用该模型分析围岩特征和爆破设计参数对第一孔爆破振动的影响,并对各因素的敏感性进行了分析。结果表明,第二孔的爆破对第一孔衬砌结构的安全性有严重影响。基于安全阈值和敏感性分析,选择炸药速度,装药密度和挖掘长度作为影响隧道结构安全的关键参数。与此同时,
更新日期:2020-11-18
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