Dynamic Simulation Of The Construction Process Of Twin Arched-tunnel And Monitoring Measurement

Relyed on Yinjiayan tunnel project , in this paper, the construction process of tunnel has been simulated based on 2D elasto-plastic structural analysis and 3D FEM analysis with ANSYS program, combining the study characteristic and the current construction method of twin arched-tunnel in domestic and aboard. The paper also studies the mechanics behavior problem of the excavating and supporting during the twin arched-tunnel construction by the analysis of the field monitoring measured data of observational Method .Firstly, the plane elastoplastic model of Yinjiayan twin arched-tunnel has been set up . Then, the paper introduces DP (Drucker-Prager) surrender criterion of rock soil project adopted and basic step of the tunnel level analysing systematically. Through calculating Lead holes and excavate it to the displacement field of country rock and influence in conformity with the force field while understanding , fix to monitoring and controlling the position where the danger with very key work is lighted, and have got some useful conclusions, have offered data-prepring for the fact that all the section is excavated on main hole of the tun.The paper has analysed the stress field and displacement field of the surrounding rock body under different processes and the supporting mechanics's changing. By the constast of mechanics of central-wall in the situation of backfill and unbackfill of main hole corresponding lead hole position under the two kinds of operating modes when excavating, it expounds the effect of construction factor to the central- wall.In fact ,In reality project, the excavation of twin arched-tunnel is a space question. So, the paper has simulated the excavation course of the twin arched-tunnel By the three-dimensional space model in chapter four, the paper simulates the space effect during tunnel construction, analyzes the transaction between the left tunnel and the right tunnel, and also analyzes the deformation and stability of central-wall.The paper takes design & implementation of construction measurement of superposed twin arched-tunnel as its basis, investigating from measurement principles,measurment design ,data analysis. Based on the gathered data of esperimence, the feed back according to stability analysis of FEM are conducted so as to grasp the rules of deformation and the stress of ground ang structure . By analyzing the pressure data of K3 +657 sections, the paper assess the stability of ground and structure of twin arched-tunnel as well as determine reasonable support time.Finally, it summarizes the feasibility and the meaning of FEM analysis and various kinds of experience method in Observational Method construction. The research results have been offered for Yinjiayan tunnel construction and guided effectively.