Abstract Based on the urban utility tunnel project of the Start-up Area of Xiong′ an New Area, in order to define the seismic performance of the utility tunnel structure, the low-frequency cyclic loading anti-seismic test was completed on the overall structure model and joint test pieces of the large-section utility tunnel with four compartments,and the computational analysis was carried out of the state of failure and mechanical property of test pieces. The results show that (1) the hysteresis curve of the overall structure is relatively saturated, showing good ductility and energy dissipation capacity, the middle joints have better bending performance, and the ductility of the joints on the edges is worse than that of the middle joints; (2) the skeleton curve of joint test pieces is split into three phases: obvious cracking, yield and ultimate phases, and after the overall structure reaches the ultimate load, the curve is basically close to being horizontal; (3) the stiffness degradation of the overall structure and joint test pieces is continuously uniform throughout the loading process; (4) the structural design of the utility tunnel can ensure seismic performance during normal use. Combined with the stress characteristics and state of failure of test pieces, the structural design of the utility tunnel of the Project is optimized.
Abstract：
Based on the urban utility tunnel project of the Start-up Area of Xiong′ an New Area, in order to define the seismic performance of the utility tunnel structure, the low-frequency cyclic loading anti-seismic test was completed on the overall structure model and joint test pieces of the large-section utility tunnel with four compartments,and the computational analysis was carried out of the state of failure and mechanical property of test pieces. The results show that (1) the hysteresis curve of the overall structure is relatively saturated, showing good ductility and energy dissipation capacity, the middle joints have better bending performance, and the ductility of the joints on the edges is worse than that of the middle joints; (2) the skeleton curve of joint test pieces is split into three phases: obvious cracking, yield and ultimate phases, and after the overall structure reaches the ultimate load, the curve is basically close to being horizontal; (3) the stiffness degradation of the overall structure and joint test pieces is continuously uniform throughout the loading process; (4) the structural design of the utility tunnel can ensure seismic performance during normal use. Combined with the stress characteristics and state of failure of test pieces, the structural design of the utility tunnel of the Project is optimized.
ZHU Li1 XIAN Jianping1 YUAN Yong2 WANG Hengdong3 MA Huabing4
.Study on the Test of Seismic Performance of Prefabricated Utility Tunnel with a Large Section[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(6): 140-146
2022, Vol. 59 