苏州城北路大断面矩形顶管顶力计算与实测分析

矩形顶管顶力作为顶进设计的重要参数，目前尚无统一的标准计算公式。结合大断面矩形顶管的特殊性，在比尔鲍曼理论、管土与管浆部分接触理论基础上进行修正改进，将顶管机机壳摩阻力单独计算，推导出大断面矩形顶管的顶力计算新方法。结合苏州城北路大断面矩形顶管工程案例，将计算值与实测值进行对比分析，研究发现： 1)采用比尔鲍曼理论计算上部土压力更为合理； 2)当形成稳定的泥浆套时，迎面阻力取1.1倍静止土压力，同实际情况吻合度高； 3)推导方法计算出的单位长度顶力与实测值较为接近，工程适用性较好。

Calculation and Measurement Analysis of Jacking Force of Large Cross section Rectangular Pipe Jacking Machine Used in Suzhou Chengbei Road

The jacking force of rectangular pipe jacking machine is an important parameter in jacking design, but there is no unified standard calculation formula at present. In this paper, the Bill Bowman theory and the theory of partial contact between pipe soil and slurry are modified and improved, and the shell frictional resistance of pipe jacking machine is calculated separately, based on which a new method for calculating the jacking force of rectangular pipe jacking machine with large cross section is deduced. The comparative analysis is made between calculated value and the measured value of jacking force of the large section rectangular pipe jacking machine used in Suzhou Chengbei Road, and the results show that: (1) The Bill Bowman′s theory suits for upper earth pressure calculation better. (2) When a stable mud set is formed, the head resistance of 1.1 times of the static earth pressure is highly consistent with the actual situation. (3) The jacking force per unit length calculated by the derivation method is close to the measured value, and the engineering applicability is good.