Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

In view of the influence of symmetrical surcharge, unloading and excavation of soft clay soils on shield tunnels, the surface settlement, tunnel settlement, vertical additional earth pressure and tunnel additional confining pressure are measured by an indoor model test. The changes of confining pres...

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Autores principales:	Pengfei Xiang, Gang Wei, Shuming Zhang, Yunliang Cui, Huifang Guo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	soft clay shield tunnel symmetrical surcharge & unloading symmetrical excavation settlement Mathematics QA1-939
Acceso en línea:	https://doaj.org/article/4415445e45d54d8dbc8e63c46165444c
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spelling	oai:doaj.org-article:4415445e45d54d8dbc8e63c46165444c2021-11-25T19:06:06ZModel Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels10.3390/sym131120202073-8994https://doaj.org/article/4415445e45d54d8dbc8e63c46165444c2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-8994/13/11/2020https://doaj.org/toc/2073-8994In view of the influence of symmetrical surcharge, unloading and excavation of soft clay soils on shield tunnels, the surface settlement, tunnel settlement, vertical additional earth pressure and tunnel additional confining pressure are measured by an indoor model test. The changes of confining pressure, tunnel settlement, surface settlement and vertical earth pressure caused by surcharge, unloading and excavation are studied and analyzed. The results show that, in soft clay, surcharge will cause tunnel settlement, and unloading and excavation will generally cause tunnel uplift. There is hysteresis in surface settlement and tunnel settlement above the shield tunnel caused by surcharge and unloading; the change of additional confining pressure of the shield tunnel caused by surcharge is mainly concentrated in the three directions of 3, 5 and 7 of the radar chart. These points belong to weak points. Unloading and excavation can effectively reduce the additional confining pressure of the tunnel in these three directions; excavation will cause the increase of vertical cumulative additional earth pressure and tunnel confining pressure in local directions. The influence range of surcharge in soft clay is wider than that in sand, but the depth is relatively shallow.Pengfei XiangGang WeiShuming ZhangYunliang CuiHuifang GuoMDPI AGarticlesoft clayshield tunnelsymmetrical surcharge & unloadingsymmetrical excavationsettlementMathematicsQA1-939ENSymmetry, Vol 13, Iss 2020, p 2020 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	soft clay shield tunnel symmetrical surcharge & unloading symmetrical excavation settlement Mathematics QA1-939
spellingShingle	soft clay shield tunnel symmetrical surcharge & unloading symmetrical excavation settlement Mathematics QA1-939 Pengfei Xiang Gang Wei Shuming Zhang Yunliang Cui Huifang Guo Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels
description	In view of the influence of symmetrical surcharge, unloading and excavation of soft clay soils on shield tunnels, the surface settlement, tunnel settlement, vertical additional earth pressure and tunnel additional confining pressure are measured by an indoor model test. The changes of confining pressure, tunnel settlement, surface settlement and vertical earth pressure caused by surcharge, unloading and excavation are studied and analyzed. The results show that, in soft clay, surcharge will cause tunnel settlement, and unloading and excavation will generally cause tunnel uplift. There is hysteresis in surface settlement and tunnel settlement above the shield tunnel caused by surcharge and unloading; the change of additional confining pressure of the shield tunnel caused by surcharge is mainly concentrated in the three directions of 3, 5 and 7 of the radar chart. These points belong to weak points. Unloading and excavation can effectively reduce the additional confining pressure of the tunnel in these three directions; excavation will cause the increase of vertical cumulative additional earth pressure and tunnel confining pressure in local directions. The influence range of surcharge in soft clay is wider than that in sand, but the depth is relatively shallow.
format	article
author	Pengfei Xiang Gang Wei Shuming Zhang Yunliang Cui Huifang Guo
author_facet	Pengfei Xiang Gang Wei Shuming Zhang Yunliang Cui Huifang Guo
author_sort	Pengfei Xiang
title	Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels
title_short	Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels
title_full	Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels
title_fullStr	Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels
title_full_unstemmed	Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels
title_sort	model test on the influence of surcharge, unloading and excavation of soft clay soils on shield tunnels
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4415445e45d54d8dbc8e63c46165444c
work_keys_str_mv	AT pengfeixiang modeltestontheinfluenceofsurchargeunloadingandexcavationofsoftclaysoilsonshieldtunnels AT gangwei modeltestontheinfluenceofsurchargeunloadingandexcavationofsoftclaysoilsonshieldtunnels AT shumingzhang modeltestontheinfluenceofsurchargeunloadingandexcavationofsoftclaysoilsonshieldtunnels AT yunliangcui modeltestontheinfluenceofsurchargeunloadingandexcavationofsoftclaysoilsonshieldtunnels AT huifangguo modeltestontheinfluenceofsurchargeunloadingandexcavationofsoftclaysoilsonshieldtunnels
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Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

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