Simplified Analysis for Reflective Overpressure on Walls of Rectangle-Section Tunnel due to Its Inner-Explosion

作     者：田力 李忠献 周清 TIAN Li,LI Zhongxian,ZHOU Qing(School of Civil Engineering, Tianjin University, Tianjin 300072,China)

作者机构：School of Civil EngineeringTianjin University 

出 版 物：《Transactions of Tianjin University》 (天津大学学报（英文版）)

年 卷 期：2008年第14卷第5期

页      面：363-370页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by National Natural Science Foundation of China(No.50678116,50638030 and 50528808) National Key Technology R&D Program(No.2006BAJ13B02) 

主　　题：矩形面隧道 参考数据 爆破力 装药量 

摘      要：Based on the constructing thought of the displacement model of isoparametric finite element, an extended interpolating algorithm is deduced for calculating the overpressure history of an optional point on the walls of the rectangle-section tunnel under an optional point-explosion in its internal space. According to the working principle, the overpressure histories of all nodes on the walls of a tunnel with the equal width and height of 2 m, induced by a reference-charge explosion at each node in this tunnel s cross section, are computed using the LS-DYNA software, and then are gathered to establish a reference database, which makes it possible to set optionally the positions of the explosive and the overpressure-observed point. In addition, some variation factors of peak values and durations of overpressure on the walls, reflecting some changes on the charge weight and the sizes of width and height of the section, are included in this algorithm in order to simulate approximately the overpressure responses on the walls under the optional charge weight and cross-section size. Some example analyses indicate the rapidity and validity of this method, and therefore this will bring it a good prospect in engineering application.