Performance of overlapped shield tunneling through an integrated physical model tests,numerical simulations and real-time field monitoring  

作　　者：Junlong Yang Chen Liu Qiushi Chen Xiongyao Xie 

机构地区：[1]Key Laboratory of Geotechnical and Underground of Ministry of Education,Tongji University,Shanghai 200092,China [2]Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China [3]Glenn Department of Civil Engineering,Clemson University,Clemson,SC 29634,USA

出　　处：《Underground Space》2017年第1期45-59,共15页地下空间（英文）

基　　金：The authors would like to acknowledge the financial support from National Natural Science Foundation of China-China(41372273);Shanghai Science and Technology Development Funds-China(14231200600,15DZ1203900,16DZ1200400).

摘　　要：In this work,deformations and internal forces of an existing tunnel subjected to a closely overlapped shield tunneling are monitored and analyzed using a series of physical model experiments and numerical simulations.Effects of different excavation sequences and speeds are explicitly considered in the analysis.The results of the physical model experiments show that the bottom-up tunneling procedure is better than the top-down tunneling procedure.The incurred deformations and internal forces of the existing tunnel increase with the excavation speed and the range of influence areas also increase accordingly.For construction process control,real-time monitoring of the power tunnel is used.The monitoring processes feature full automation,adjustable frequency,real-time monitor and dynamic feedback,which are used to guide the construction to achieve micro-disturbance control.In accordance with the situation of crossing construction,a numerical study on the performance of power tunnel is carried out.Construction control measures are given for the undercrossing construction,which helps to accomplish the desired result and meet protection requirements of the existing tunnel structure.Finally,monitoring data and numerical results are compared,and the displacement and joint fracture change models in the power tunnel subject to the overlapped shield tunnel construction are analyzed.

关 键 词：Overlapped tunnel Automatic monitoring Micro-disturbance control 

分 类 号：U45[建筑科学—桥梁与隧道工程]