Connectional Measurement Method of Super-Long Shield Tunnel with Small Space to Start
With the rapid development of urban construction in China,shield construction is widely used in railway tunnels due to the advantages such as small construction disturbance and high degree of mechanization.Due to the characteristics of tunnel forming in one operation by shield tunneling method,the measurement accuracy has a great influence on the overall quality of the project,and it is difficult to carry out high precision tunnel control measurement under the conditions of narrow space of initial shaft of shield tunneling machine and long distance of single head excavation.Taking a shield tunnel project as an example,this paper expounds the design and implementation of tunnel control measurement method under the above conditions in detail,and theoretically predicts the directional accuracy that this method can achieve.Through the statistical analysis of the measured data,the theoretical prediction results are verified,which proves the feasibility of the method and the correctness of the error prediction theory.
railway tunnelsuper-long unidirectional shield tunnelingstarting from a small spaceconnection surveybaseline azimuthdeviation prediction
NETL
NSTL
万方数据
