Abstract
The construction of metro line energy management center (MLEMC) is one of the important parts of metro line, which is the key organization to realize the energy consumption management of the metro operation. To protect the safety of adjacent high-rise buildings during the blasting of subway foundation pit engineering, it is crucial to study the response characteristics of building structures. This paper takes the MLEMC vertical pit blasting project of Wuhan Metro Line 8 as an example. The law of blasting vibration attenuation along the earth’s surface and the vibration velocity response characteristics of the building structure were analyzed by small explosive test. LSDYNA numerical model was established, and the reliability of the model and parameters was verified by experimental data. Combined with the relevant specifications, the maximum charge in single delay was calculated and analyzed. The numerical model of the maximum charge in single was established, and the prediction model of the vibration velocity related to the floors of high-rise buildings was further proposed. Combined with the failure principle of reinforced concrete structure, the safety of high-rise buildings under blasting vibration was analyzed and evaluated.
Highlights
In October 2019, there are 41 cities with operating metros in China
The results show that the numerical simulation method is feasible to study the performance of adjacent high-rise buildings under blasting vibration during foundation pit construction
In order to ensure the safety of high-rise buildings under blasting vibration of foundation pit excavation, based on the relevant Regulations of China, the response characteristics of structures under blasting vibration are analyzed through blasting test and numerical simulation, so as to guide the actual engineering construction
Summary
In October 2019, there are 41 cities with operating metros in China. A total of 4600 km of metros have been built in Chinese cities. The impact of blasting vibration on the structure as well as its key parts (such as beams, columns, and plates), a large number of experts and researchers utilized numerical calculation methods to analyze the dynamic response of the frame structure. This paper is aimed at investigating the dynamic performance of adjacent high-rise RC frame buildings of 17 stories building [19,20] under blasting vibration caused by foundation pit blasting excavation, and the excavation blasting engineering of the MLEMC shaft foundation pit between Hongshan Road station and Xiaohongshan station of Wuhan Metro Line 8 is taken as a case (Section 2). Combined with numerical calculation and verification, the influence of maximum charge in one delay to the response of adjacent high-rise building is analyzed, and a model for predicting the vibration velocity of each floor is established, and the safety and stability of the high-rise building is evaluated by considering the failure stress principle of reinforced concrete high-rise buildings
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