Study On Precise Orientation Of Shield Construction In Metro Tunnel

Combining with the shield drive tunnel of Nanjing metro, based on the analysis on the origin and measure of influencing elements to the breakthrough of the metro shield drive tunnel. Raised some corresponding methods to decrease the error cause by those influencing elements. Proved the validity of these methods through theory and practice. By developed the new Shield Auto Drive System, can display the whole process of the shielding directly and animatedly. With the shield process information database realized the informative manage. The primary contents are as follows:(1) According to the characters and principles of the shield methods and based on the analysis on the origin and measure of influencing elements to the breakthrough of the metro shield drive tunnel. Raised some corresponding methods to decrease the error cause by those influencing elements and did corresponding analysis.(2) Combined with the engineering practice, analysis the plan of city metro control-network. Raise corresponding plan to the ground control-network, upright-well survey, underground lead survey and analysis the handily and credibility of the new methods.(3) According to the different influence, modernized the equal-influence error distribute methods, raised the non-equal-influence error distribute methods. In order to better combined with the engineering practice, and took the reality of the engineering practice under considering to raise the new error distribute methods. The result proved take full considering of the current equipment situation of the engineer department, the new method can fulfilled the requirement of precision and more economical, better help in work efficiency and save money and manpower.(4) In order to display the shielding more directly and animatedly and evaluate the situation in time, realize the automation and control of the shield and informative manage of all kind of data of the whole process, developed new shield auto drive system, set up the primary shield information database. Through the database can animate display the current situation of the processing of the shield at any time. Compared tunnel designed data with the information data could show the need to adjust the shield. Combine the designed data with the realtime processing data could help the driver to inquire about the current situation of the shield and do some help in analysis, forecasting, evaluating the situation, so the driver can make correct estimation.