%0 Journal Article %A CHEN Jian %A LI Zhi-ming %T Theoretical Algorithm for Over-excavated Volume and Articulation Angle During Shield Tunneling Along Sharp Curves %D 2017 %R %J China Journal of Highway and Transport %P 66-73 %V 30 %N 8 %X In order to improve the ability of shield machine during the curved excavation of shield tunnel, operation parameters such as copy cutter length, range and articulation angle should be precisely forecasted. However, above operation parameters, which were set based on plane geometry theory of shield and tunnel design axes, failed to meet requirements of the 3D curved tunnel construction. A theoretical algorithm of copy cutter length, range and articulation angle of the 3D curved tunnel was proposed based on the spatial vector analysis. Calculation formulas were solved by Fortran program. Furthermore, the simulation of operation parameters in an actual shield tunnel was performed. Values of simulation were compared with measured results to verify the validity of the proposed algorithm. The results show that measured values of articulation angle are well consonant with the ones of simulation. When shield machine excavates at curved sections, the measured value is a little larger than the value of simulation. Through taking fitting tunnel design axes in the center point of cutter disc as an object of rectifying a deviation in the actual construction, there are differences between measured values and ideal values of fitting tunnel design axes in the center point of segment. The simulated range of copy cutter is narrower than the measured range but the simulated value of copy cutter length is a little larger than the measured value. The main reason of differences is that there exists deformation in the stratum in the actual construction but the assumption of the shield is that there is no extrusion as well as no deformation. %U http://zgglxb.chd.edu.cn/EN/abstract/article_2588.shtml