Statistical Analysis of Monitoring Data and Reserved Deformation Based on Interval Estimation Method
(1 China Railway Development & Investment Group Co., Ltd., Kunming 650118; 2 Yunnan Provincial Bureau of Transportation Engineering Quality Supervision Bureau, Kunming 650214 )
Abstract：
Aiming at the distribution scope of deformation magnitudes and reserved deformations of the YuxiChuxiong expressway tunnel, a statistical analysis on the laws in condition of surrounding rocks with different classifications and overburdens is conducted by selecting the monitoring data of 471 sections of 14 tunnels based on interval estimation method. The results show that tunnel deformation increases with an increase of tunnel overburden, the deformation of surrounding rocks of grade Ⅳ is larger than that of grade Ⅴ and attention should be paid to the deformation and deformation control; the deformations of surrounding rocks of grade Ⅳ and Ⅴ tend to be stable around 40 days after excavation, and it is suggested lining should be installed after this time. As for the surrounding rocks of grade Ⅳ, it is suggested the reserved deformation should be 17 cm if the overburden is less 50 m and the reserved deformation should be 50 cm in condition of enhancing the primary support strength if the overburden is between 50-300 m. As for the surrounding rocks of grade Ⅴ, it is suggested the reserved deformation should be 18 cm if the overburden is less than 50 m and the reserved deformation should be 32 cm if the overburden is between 50-300 m
LIU Qingfeng1 LIU Qingzhi2
.Statistical Analysis of Monitoring Data and Reserved Deformation Based on Interval Estimation Method[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(1): 142-147
2020, Vol. 57 