Model Test for Dynamic Construction Mechanical Effect of Large-Span Loess Tunnel

作     者：何本国 朱永全 叶朝良 张志强 

作者机构：School of Civil EngineeringSouthwest Jiaotong University School of Civil EngineeringShijiazhuang Tiedao University 

出 版 物：《Journal of Shanghai Jiaotong university(Science)》 (上海交通大学学报（英文版）)

年 卷 期：2011年第16卷第1期

页      面：112-117页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：the National Natural Science Foundation of China(Nos. 50978172 and 51078318) the New Century Excellent Talents in University(No. 10-0667) 

主　　题：physical model construction method loess tunnel construction mechanics stability 

摘      要：It has been a focus of debate for a large time on construction methods for large-span loess *** construction method has much effect on stability of tunnel and construction *** and failure of surrounding rock are quite *** with the large-span loess tunnel of Zhengzhou- Xi an high-speed passenger rail line in China,large scale model test with geometric proportion 1:20 is applied to study on dynamic mechanical behavior of various construction *** include full-face excavation with support and no support,and benching method with *** is found that pre-deformation and stress accumulation take place ahead of working *** effects of three construction methods are further studied,particularly in terms of tunnel displacement and stress *** is revealed that benching method transfers load to an unexcavated area,limits horizontal deformation,reduces stress concentration effectively,lengthens the distance between location of peak for stress concentration and working face,and consequently increases *** model test results not only supply theoretical foundation for determination of reasonable construction method,but also can act as reference for similar tunnel and underground engineering construction.