Abstract The problem of highway tunnel defects has become an unavoidable factor that affects traffic safety. Based on the context of Jizhao tunnel on Xiamen-Chengdu expressway, this paper conducts tests on the lining concrete strength, tunnel inner contour condition in terms of various tunnel defects, such as lining cracking, cable groove sinking and sidewall seepage, analyzes the causes of tunnel defects based on the testing results, and proposes reasonable treatment options: (1) using the foot-locking and grouting perforated steel pipes, and installing additional plain concrete inverted arch or reinforced concrete invert arch to effectively improve the stability of the tunnel structure; (2) setting up transverse drainage pipes in the additional inverted arch section in combination with longitudinal drainage pipes to ensure smooth drainage; (3) re-pouring the secondary lining sidewalls with severe deformation,cracking and spalling, in combination with installation of low pre-stressed anchor bolts and steel strips to anchor the secondary lining and the surrounding rock as a whole. These methods can provide certain references for treating the defects of existing tunnels.
Abstract：
The problem of highway tunnel defects has become an unavoidable factor that affects traffic safety. Based on the context of Jizhao tunnel on Xiamen-Chengdu expressway, this paper conducts tests on the lining concrete strength, tunnel inner contour condition in terms of various tunnel defects, such as lining cracking, cable groove sinking and sidewall seepage, analyzes the causes of tunnel defects based on the testing results, and proposes reasonable treatment options: (1) using the foot-locking and grouting perforated steel pipes, and installing additional plain concrete inverted arch or reinforced concrete invert arch to effectively improve the stability of the tunnel structure; (2) setting up transverse drainage pipes in the additional inverted arch section in combination with longitudinal drainage pipes to ensure smooth drainage; (3) re-pouring the secondary lining sidewalls with severe deformation,cracking and spalling, in combination with installation of low pre-stressed anchor bolts and steel strips to anchor the secondary lining and the surrounding rock as a whole. These methods can provide certain references for treating the defects of existing tunnels.
YANG Chunping HU Qiang
.Research on the Detection and Treatment Technology for Highway Tunnel Defects[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(4): 237-245
2021, Vol. 58 