Influence of non-associated flow rule on passive face instability for shallow shield tunnels

Autor:	Mingju Zhang, Qingfei Huang, Pengfei Li, Yingjie Wei, Fan Wang
Rok vydání:	2022
Předmět:	Computer simulation Face (geometry) Shield Flow (psychology) Dilation (morphology) Building and Construction Numerical models Limit (mathematics) Mechanics Geotechnical Engineering and Engineering Geology Instability Geology
Zdroj:	Tunnelling and Underground Space Technology. 119:104202
ISSN:	0886-7798
DOI:	10.1016/j.tust.2021.104202
Popis:	This paper aims at analyzing the influence of non-associated flow rule on passive face instability for shallow shield tunnels. The influence exerted by dilation angle on the limit support pressures, the failure zones and partial failure ratios is investigated by numerical simulations. Based on the failure zone obtained from numerical simulation, a log-spiral mechanism is proposed. The upper-bound theorem is employed to acquire the limit support pressures, failure zones and partial failure ratios. The analytical results indicate that dilation angle has a significant influence on the limit support pressure and failure mechanisms. Finally, by comparison with the numerical models and existing analytical models, the results indicate that the proposed log-spiral model has a certain accuracy in analyzing the face instability of blow-out.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f17a453d028a4f8ec255385aac274a1 https://doi.org/10.1016/j.tust.2021.104202 Zobrazit plný text záznamu Full Text from ScienceDirect