Journal Published Online: 29 January 2024
Volume 47, Issue 3

Experimental Study on Stability Analysis of Shallow-Buried Metro Station Hard Rock Excavation under Blasting Vibration Effect

CODEN: GTJODJ

Abstract

By considering a certain metro station of Qingdao Metro Line 4 as the research object, a three-dimensional geotechnical testing model has been developed to analyze the stress and deformation characteristics of the surrounding rocks under blasting vibration effect. The simulation of the surrounding rock blasting process is achieved through an electric spark source. We conducted simulation tests on the excavation stability of shallow-buried hard rock metro stations with and without considering blasting damage effects, respectively. The stress, displacement, and primary support stress changing laws of the surrounding rock under different overburden thicknesses using the arch cover method and the primary support arch cover method have been revealed. Finally, we analyzed the applicability of the primary support arch cover method in terms of vault settlement, clearance convergence, and floor heave. Results show that the surrounding rock of the arch has roughly gone through three deformation stages, namely a slow deformation stage, rapid deformation stage, and stable deformation stage. Whether it is blasting excavation or non-blasting excavation, the settlement of the arch is within a safe and controllable range. Because of the refinement of the excavation process by the primary support arch cover method, the stress release is relatively stable throughout the entire excavation process, but the significant impact of blasting vibration on the surrounding rock cannot be ignored. The excavating of the left and right guide holes is the key process for the displacement and stress variation. The deformation and stress generated by the arch cover method have a small difference compared to the deformation and stress generated by the primary support arch cover method, indicating that the latter excavation method can be used under current engineering geological conditions. No large-area collapse and instability occurred in the experimental process, which provides a theoretical basis for similar projects.

Author Information

Li, Wei
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, PR China School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong, PR China
Zhang, Qingsong
School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong, PR China
Peng, Yuxuan
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, PR China
Yu, Liyuan
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, PR China
Bai, Jiwen
School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong, PR China
Liu, Yankai
School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong, PR China
Wang, Zhiheng
School of Civil Engineering, Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong, PR China
Han, Gang
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, PR China Shandong Railway Transit Survey and Design Institute Co., Ltd., Jinan, Shandong, China
Pages: 28
Price: $25.00
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Details
Stock #: GTJ20230382
ISSN: 0149-6115
DOI: 10.1520/GTJ20230382