Abstract:

In order to improve the plane fine adjustment efficiency of metro lines and avoid line position deviation of control point of adjacent sections after line adjustment, a tangent circle method is adopted. The results show that: 1) When adjusting the line position of the adjacent sections, the line position of the section with stable curve will not be affected. 2) By using tangent circle method, the existing curve shortens at one end and increases in length. 3) In the design phase, the tangent circle method is the most practical for plane line selection of continuous curve with plenty of control points. 4) In the construction process, by using the tangent circle method when the deviation occurs to tunnel plane excavation, subsequent line adjustment scheme can be proposed and the engineering risk induced by shield stop can be reduced.

Key words: urban rail transit, line adjustment, tangent circle method, plane design of metro lines