Abstract
According to the advantages of high tensile resistance and high shear strength of composite steel plate, a new antiexplosion protection method of composite steel plate lining structure is put forward. The numerical model of explosion impact of subway tunnel with composite steel plate lining structure was established by dynamic analysis software. The transient dynamic response of lining structure with the composite steel plate was simulated when explosion occurred. The research results show that the influence of explosive quantity on each point of composite steel plate lining structure is different and the change of acceleration near the centre of the detonation source is generally greater than the multiple of the increase of explosive quantity. The increase of velocity and displacement is basically consistent with the quantity of explosive. The influence of axial stress on the lining structure is the least, and the influence of the lining structure is greater in the y-direction than in the x-direction. The research results can provide the plan and basis for the emergency response of the subway tunnel.
Highlights
With the acceleration of the modernization process, the construction of subway is the best solution to the traffic jam problem and the catalyst to promote the modernization process
As an effective tool to solve the inconvenience of citizens, subway tunnels sometimes become places where terrorists carry out terrorist bombings
In order to protect the safety of real citizens and reduce the loss of public property, subway tunnel structures should have sufficient antiexplosion capability. erefore, it is of great theoretical value to study the role of composite steel plates in subway tunnel protection [1,2,3]
Summary
With the acceleration of the modernization process, the construction of subway is the best solution to the traffic jam problem and the catalyst to promote the modernization process. 2. Establishment of Numerical Model of Composite Steel Plate Lining Protection Structure. E strain rate effect of composite steel plate material is expressed by Cowper–Symonds model [9], and its dynamic yield strength σy can be expressed as follows: σy. Establishment of Composite Steel Plate Lining Protection Structure Model. According to the engineering background of Nanjing subway tunnel, the explosive-air-composite steel plate-lining-surrounding soil model is established by using finite element software LS-DYNA [10]. It is mainly divided into five parts: explosive unit, air unit, composite steel plate unit, lining structure unit, and soil unit. The lining structure adopts the h-j-c model, which was initially used to simulate brittle materials, such as glass and ceramics, before it was developed to simulate concrete. Where c is the specific heat ratio of gas, which takes the value of 1.4, the relative density ρ0 of air takes the value of 1.29 ∗ 10−3 kg/m3, and the initial internal energy E of unit volume takes the value of 0.25 MPa
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
