Comparison of rectangular and circular bored twin tunnels in weak ground

作     者：Michael Vinod Hadi Khabbaz 

作者机构：School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)Australia 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2019年第4卷第4期

页      面：328-339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] 

主　　题：Twin tunnels Clay Numerical modeling Rectangular TBM 

摘      要：The recent innovation of a rectangular tunnel boring machine(TBM),and its use in the Hongzhuan Road tunnel underpass by the China Railway Engineering Group(CREG),has revitalized shallow depth soft soil *** paper presents the findings of a numerical study using PLAXIS to determine the surface settlements and moments produced in tunnel linings for circular and rectangular twin *** effects of the relative positions of twin tunnels,critical distances,volume losses,depths of burial,and tunnel sizes for both circular and rectangular tunnels are the key parameters of this *** results indicate that rectangular tunnels are suitable for shallow depths in weak ground as they have lesser settlement compared with circular *** is crucial for tunneling beneath important structures such as railway lines and existing ***,the maximum bending moment produced in the rectangular tunnel lining is higher than that for circular *** use of rectangular TBMs is an unconventional method in modern day tunneling;however,the analysis in this project recommends that tunnel industry engineers consider this method for shallow depth weak ground tunneling.