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

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

Huang, Jizhi (South China University of Technology)
Zhang, Y. (TU Delft Materials and Environment; Fuzhou University)
Ouyang, Xiaowei (Guangzhou University)
Xu, Guoyuan (South China University of Technology)

2019

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.

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

http://resolver.tudelft.nl/uuid:5d841192-e26d-4a6f-91b4-4229a93dac1d

https://doi.org/10.3934/mbe.2019309

1547-1063

Mathematical Biosciences and Engineering, 16 (6), 6209-6230

In Special Issue: Mathematical Methods in Civil Engineering

Institutional Repository

journal article

© 2019 Jizhi Huang, Y. Zhang, Xiaowei Ouyang, Guoyuan Xu