Numerical study on ECC arch strengthened linings with different damaged levels
LI Xiaoqin1，ZHANG Tian1，DING Zude1，REN Zhihua2
(1. Faculty of Civil Engineering and Mechanics，Kunming University of Science and Technology Kunming，Kunming，Yunnan 650500，China；2. Yunnan Research Institute of Highway Science and Technology，Kunming，Yunnan 650051，China)
Abstract：Four kinds of 1/5 scale model linings have been designed based on the normal two-lane highway tunnel linings under vertical soil pressure，which are normal concrete(NC)，reinforced concrete(RC)，ECC and reinforced ECC(R/ECC) linings. Vertical loading tests have been done on the four linings. ECC Arch，R/ECC Arch and RC Arch strengthening were designed for 1/5 NC model lining. Subsequently，FE models of the NC and ECC linings were established based on the damaged plasticity model. After the FE models were validated with comparing the numerical and test results of NC and ECC linings，the numerical simulations on ECC，RC and R/ECC arch strengthened damaged NC linings with different damaged levels were carried out. The results show that the toughness and ductility of ECC and R/ECC linings are obviously better than the traditional NC lining，whereas the R/ECC lining gave better load-bearing and deformation capacities. R/ECC arch strengthened NC lining gave the best load-bearing capacities and the largest displacement，and it was mostly suitable for the NC linings from severely to seriously damaged level. Nevertheless，ECC arch strengthening method is suitable for both slightly and severely damaged linings. RC arch strengthening method is mainly suitable for the extremely damaged NC linings. Above conclusions can provide the basis for the application of ECC in tunnel maintenance and strengthening.
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2019, Vol. 38 
