Lagged settlement in sandy cobble strata and earth pressure on shield tunnel

Jizhi Huang, Yong Zhang, Xiaowei Ouyang, Guoyuan Xu

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
57 Downloads (Pure)

Abstract

Lagged settlement is a typical accident induced by shield construction in sandy cobble strata. This paper analyzed the process and mechanism of lagged settlement, results show that all phases are in accord with the characteristics of ellipsoid theory of particle flows. Based on this theory, a method for calculating coefficient of lateral earth pressure and loosened earth pressure is proposed in this research. For the coefficient of lateral earth pressure, the boundary of loosened ellipsoid is divided into two parts, the arch zone and the excavation zone, and the lateral pressure coefficients are derived respectively according to the stress state. For loosened earth pressure on tunnel, the Terzaghi earth pressure theory and Protodyakonov earth pressure theory are adapted in different conditions according to the state of loosened cobble soil. Theories developed in this study can be applied on determination of shield excavation parameters, as well as calculation of loosened earth pressure and control of tunnel support.

Original languageEnglish
Pages (from-to)6209-6230
Number of pages22
JournalMathematical Biosciences and Engineering
Volume16
Issue number6
DOIs
Publication statusPublished - 2019

Bibliographical note

In Special Issue: Mathematical Methods in Civil Engineering

Keywords

  • Coefficient of lateral earth pressure
  • Ellipsoid theory of particle flows
  • Lagged settlement
  • Loosened earth pressure
  • Sandy cobble soil

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