Open AccessField Tests on the Stress Characteristics of Enriched Water Tunnel Invert
Author(s) -
Min Du,
Xiang Li,
Xuchun Wang,
Hongwei Teng,
Peng Zhang,
Zhen Zhu
Publication year - 2021
Publication title -
geofluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.44
H-Index - 56
eISSN - 1468-8123
pISSN - 1468-8115
DOI - 10.1155/2021/6684884
Subject(s) - rebar , stress (linguistics) , stress field , geotechnical engineering , groundwater , compressive strength , ultimate tensile strength , geology , stress concentration , stress path , materials science , composite material , structural engineering , finite element method , engineering , plasticity , philosophy , linguistics , fracture mechanics
To monitor the changes in the force of the tunnel invert steel bars after the groundwater level changes, field tests were performed to accurately and comprehensively characterize the stress acting on the rebar of a tunnel invert. Changes in stress and temperature were monitored for two layers of rebar (upper and lower) in an actual tunnel invert during its repair. The results showed that the changes in stress followed different paths for the upper and lower layers. After the groundwater is replenished, the maximum tensile stress of the rebar was 17.3 MPa, and the maximum compressive stress was 120 MPa. Major changes in stress were observed 2–6 days after rain. Based on this, the seepage path of groundwater is analyzed. During this period, the compressive stress increased threefold, and the tensile stress increased 9.5-fold. The rebar stress in the tunnel invert followed a Gaussian distribution after stabilizing. Four phases of stress progression are identified and discussed. The results can provide data support and theoretical basis for the treatment of invert floor heave in enriched water tunnel.