Study on Reliability Analysis and Application of Tunnel Lining Structure
|School||Central South University|
|Course||Underground Space Science and Engineering|
|Keywords||Tunnel Supporting structure Anchor shotcrete NESSUS Reliability|
The rapid development of the underground engineering and increasing underground projects has demanded a higher requirement on security. The environment of Underground structure is more complicated. Uncertain factors of underground complicated the design and construction of tunnel. Therefore, analyzing of underground structures and calculating the probability of failure has a great significance.Analysis the model of action of tunnel and surrounding rock by simulation program, and quantified the structure of various loads to calculate the failure probability of the tunnel, according to the state equation of supporting structure, the supporting model of different conditions was established, in considering the variability of each parameter based on the strength of criteria used for calculating the failure probability of the structure. The mainly contents as following:(1) Analysis the interaction of tunnel and surrounding rock by the model of action, combined with the theory of reliability, a calculation method has been proposed;(2) According to the structure model of tunnel lining, and building of tunnel lining structure state equation, reliability index can be get by the mathematics software Mat lab;(3) Study on the mechanism of anchor shotcrete and surrounding rock, analysis the impaction of main factor, for different supporting conditions, considered the parameter variation, by the software ANSYS to get the axial force、moment and shear of tunnel, analysis the results and reveal the impaction of different factors;(4) Taken one of Metro tunnel as the research subject, by numerical simulation method, analysis the acting mechanical of tunnel structure and lining supporting. The software NESSUS was choose to simulation, calculated the failure reliability. Combined with tunnel durability, a reasonable scheme has been proposed.