为更准确地计算矩形顶管隧道施工所需顶推力，揭示小间距顶管隧道群施工中后背土体在顶推力多次叠加作用扰动后的变化情况。首先，基于现有顶管顶推力相关计算公式推导出适用于矩形顶管的顶推力计算公式。然后，整理分析某顶管隧道群工程施工中后背土体水平位移、土压力实测数据，论证矩形顶管顶推力计算公式的正确性与合理性，得到后背土体受顶推力作用产生的水平位移是以隧道中心处为最大值的弓形分布、土体在顶推力二次作用下会产生更为显著的变化且存在残余应力现象等结论。最后，采用统计方法对顶推压力与后背土体水平位移、土压力之间的数据进行处理，取得后背土在顶推压力作用下产生水平位移与土压力的经验公式。

The jacking force required for the construction of rectangular pipe jacking tunnel should be calculated more accurately, and the variation law of the soil behind the working shaft after superposition of disturbance of jacking force for many times during the construction of smallspacing pipe jacking tunnel group should be revealed. Therefore, the calculation formulas of jacking force applicable to rectangular pipe jacking is deduced based on the existing calculation formula of jacking force, and the measured data of horizontal displacement and earth pressure of the soil behind working shaft in a pipe jacking tunnel group construction is analyzed, so as to prove the correctness and rationality of the calculation formula of jacking force for rectangular pipe jacking. It is concluded that the horizontal displacement of the soil behind working shaft under jacking force are an arched distribution with the maximum value at the center of the tunnel, and the soil will change significantly under the secondary action of jacking force and the residual stress will exist. The empirical formulas of the horizontal displacement and the earth pressure of the soil behind working shaft under the action of jacking force are obtained by processing the data between the jacking force and the horizontal displacement of the soil behind working shaft, and the data between jacking force and the earth pressure by statistical method.