Abstract: To investigate the influence of suspended load on the structural performance of corrugated steel utility tunnel (CSUT), the deformation and stress of the CSUT under suspended load are analyzed by field test and finite element analysis, and a case study is conducted on the firststage project of underground utility tunnel in Wuyi County, Hengshui, Hebei province, China. The results show the following: (1) The hanging point of the field test is within 90° (45° on both sides) of the crown position, and the structural deformation under the suspended load is not greater than 2 mm. The current design pipeline suspended load has little effect on the structure. (2) The closer the suspended load action point to the crown position, the greater the response of the structure, and the more unfavorable to the structure. (3) There is a certain limit value of the suspended load, before which the maximum stress of the structure is controlled by the dead load of the overburden soil. After the limit value is exceeded, the maximum stress of the structure is controlled by the imposed suspended load. (4) With the continuous increase of suspended load, local stress yield occurs at the loading point, but the overall bearing stiffness of the structure remains unchanged.

Key words: utility tunnel, corrugated steel structure, suspended load, structural performance, load test, finite element analysis