Abstract:

36 curved curtain pipes with a diameter of 1.62 m and a length of 255 m are used as the advanced support for Gongbei Tunnel of Hong KongZhuhaiMacao Bridge to cross Gongbei Port. In order to solve the huge gap between the calculated value of pipe jacking force and the measured value, relying on the piperoofing project of Gongbei tunnel, three formulas, i.e. Standard, Shimada and JMTA are used to calculate the theoretical pipe jacking force. At the same time, the formula calculation parameters are divided into pipe parameters, soil parameters and empirical parameters according to the source. Taking the Standard formula as an example, the calculation of the jacking force is studied from the perspective of whether the empirical parameters are reasonable. Through the comparison of empirical parameters and the calculated values of the jacking force before and after the adjustment with empirical parameters, it is considered that the adjustment of empirical parameters is feasible, and the suggestions for the optimization of empirical parameters are given.

Key words: Gongbei Tunnel, curved pipe jacking, maximum jacking force, calculation parameters