Experimental study on surface settlements induced by sequential excavation of two parallel tunnels in drained granular soil

•A novel mechanical apparatus was developed to model the construction processes related to the volume loss in separate sequential tunnels.•The relative difference between the settlements induced by two sequential tunnel events were presented in detail. Whereby the effect of the twin tunnel interacti...

Full description

Saved in:
Bibliographic Details
Published in:Tunnelling and underground space technology 2020-04, Vol.98, p.103347, Article 103347
Main Authors: Zheng, Gang, Tong, Jingbo, Zhang, Tianqi, Wang, Ruikun, Fan, Qi, Sun, Jibin, Diao, Yu
Format: Article
Language:English
Subjects:
Computer simulation
Granular soils
Mechanical devices
Settling
Simulation
Soil mechanics
Soil settlement
Soils
Surface settlements
Tunneling
Tunnels
Twin tunnelling
Underground construction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•A novel mechanical apparatus was developed to model the construction processes related to the volume loss in separate sequential tunnels.•The relative difference between the settlements induced by two sequential tunnel events were presented in detail. Whereby the effect of the twin tunnel interaction on the shap. Magnitude of the surface settlement due to the second tunnel in drained granular soils were clearly addressed.•The main variables were the spacing S between the two tunnels and the magnitude of the tunnel volume loss Vt. Their influences on the relative difference in the settlements due to each tunnel’s construction were discussed in detail in terms of parameters including the maximum surface settlement Smax, trough width i, and soil volume loss Vs, which are usually adopted for describing the geometry of the settlement trough. In this paper, twin tunnelling-induced surface settlements in drained granular soils were studied using 1 g physical models. A mechanical device was developed to achieve the simulation of a sequential twin-tunnelling process. The centre to centre spacing S between the two tunnels and the magnitude of the tunnel volume loss Vt were the two main variables considered in the experimental study. The relative difference between the settlements observed in the two tunnel events was presented in detail in terms of parameters including the maximum surface settlement Smax, trough width i, and soil volume loss Vs, whereby the twin-tunnel interaction and its effect on the surface settlements due to the second tunnel in drained soils were made clear.
ISSN:0886-7798
1878-4364
DOI:10.1016/j.tust.2020.103347