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相邻隧道爆破荷载作用下既有隧道衬砌结构动力响应试验研究

Experimental study on dynamic response of existing tunnel lining structure by adjacent tunnel blasting load.

作者信息

Zhang Bin, Li Chen, Li Jianlin, He Ruizhe, Zhang Xuefu, Li Xiaogang, Wang Zijian, Wu Yi

机构信息

School of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China.

T.Y. Lin International Engineering Consulting (China) Co., Ltd., Chongqing, 401121, China.

出版信息

Sci Rep. 2025 Aug 4;15(1):28473. doi: 10.1038/s41598-025-12687-z.

DOI:10.1038/s41598-025-12687-z
PMID:40760073
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12322069/
Abstract

During tunnel construction by the drilling and blasting method, the blasting stress waves may affect the mechanical response of existing tunnel lining structure. Based on the similarity theory, a mechanical response of existing tunnel lining structure by blasting model test is designed. The similar material of surrounding rock, explosives, and tunnel lining structure are determined by the similarity of physical mechanical parameters. This study investigates the mechanical response of existing tunnel lining concrete and reinforcing steel‌ by the action of adjacent tunnel blasting. The experimental results reveal the maximum strain distribution and stress peak value of existing tunnel lining concrete and reinforcing steel‌ affected by blasting load. Meanwhile, the equations are established between the peak particle velocity (PPV) and the strain (or stress) in tunnel lining concrete and reinforcing steel‌ affected by adjacent tunnel blasting as well. These Eqs. (13) and (14) can be used to predict the maximum stress value of existing tunnel lining concrete and reinforcing steel‌ by the action of blasting load. Simultaneously, these equations have been validated and adjusted by an actual engineering project field test. Thus, evaluating the stress states of tunnel lining caused by adjacent tunnel blasting is more effective. This finding is of great significance for evaluating the stress state of existing tunnel lining structure, as well as providing theoretical guidance and reference for the design of blasting parameters on adjacent tunnel construction.

摘要

在采用钻爆法进行隧道施工时，爆破应力波可能会影响既有隧道衬砌结构的力学响应。基于相似理论，设计了既有隧道衬砌结构爆破模型试验的力学响应。通过物理力学参数的相似性确定围岩、炸药和隧道衬砌结构的相似材料。本研究探讨了相邻隧道爆破作用下既有隧道衬砌混凝土和钢筋的力学响应。试验结果揭示了爆破荷载作用下既有隧道衬砌混凝土和钢筋的最大应变分布及应力峰值。同时，建立了相邻隧道爆破作用下既有隧道衬砌混凝土和钢筋中峰值质点速度（PPV）与应变（或应力）之间的方程。这些方程（13）和（14）可用于预测爆破荷载作用下既有隧道衬砌混凝土和钢筋的最大应力值。同时，这些方程已通过实际工程项目现场试验进行了验证和调整。因此，评估相邻隧道爆破引起的隧道衬砌应力状态更为有效。这一发现对于评估既有隧道衬砌结构的应力状态具有重要意义，同时也为相邻隧道施工爆破参数的设计提供了理论指导和参考。

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