期刊
INTERNATIONAL JOURNAL OF GEOMECHANICS
卷 21, 期 6, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GM.1943-5622.0002032
关键词
EPB shield tunnel; Granular soil; DEM; Nonuniform chamber pressure; Dynamic excavation; Face stability
资金
- National Key Research and Development Program [2016YFC0802205]
- National Science Foundation of China [51578460]
The study reveals that considering nonuniform soil pressure in the chamber leads to a partial failure mode observed in granular soil, influencing face stability and arching effect significantly, especially near the invert, which contrasts with findings associated with global failure modes considered in previous studies.
The support pressure at the tunnel face of earth pressure balance (EPB) shield machines is usually assumed to be uniform from the crown to the invert, which is a notable simplification of reality. In this study, the effects of nonuniform soil pressure in the chamber and the dynamic shield excavation process on the face stability are investigated using a three-dimensional (3D) discrete element method (DEM) model. The behavior of the excavation face subjected to different overburden depths and ground conditions is assessed and also compared with previous research. The results show that the limit face pressure and failure zone is overestimated without considering the nonuniform soil pressure in the chamber. When considering the nonuniform soil pressure in the chamber, a partial failure mode is observed in granular soil that is characterized by flow originating at the upper part of the excavation chamber and limited flow ahead of the face. This effect has a nonnegligible influence on face failure mode and the arching effect, especially near the invert, which is in contrast with the findings associated with global failure modes considered in previous studies.
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