为解决软土地区大型基坑采用传统单侧混凝土支撑伺服系统存在的轴力损失大、支撑两侧围护结构变形协调性不足的难题，以泰和污水处理厂扩建工程为背景，结合轴力实时监测和有限元分析，研究两端布置伺服加载点、双端伺服加载的支撑轴力传递形式，对比混凝土支撑-连梁-立柱节点沿支撑方向前后的轴力差值与连梁剪力值，表明连梁对支撑沿支撑方向的轴力损失影响有限。进一步通过理论公式推导与实测数据拟合，提出长距离伺服系统支撑轴力传递计算方法。结果表明： 1）两端布置伺服加载点、双端伺服加载的混凝土支撑在支撑中部轴力损失最大； 2）单侧伺服支撑轴力损失主要影响因素是支撑长度、支撑竖向间距、立柱抗弯刚度和支撑抗压刚度等； 3）随着支撑长度的增加和支撑抗压刚度的减小，轴力传递比例下降； 4）随着立柱抗弯刚度的增大和支撑竖向间距的减小，轴力传递比例先下降后上升； 5）将无伺服端轴力变化值与伺服力变化值的比值定义为伺服力变化值传递率，若以50%的伺服力变化值传递率为控制要求，采用单侧伺服混凝土支撑的长度不宜超过38.0 m。

Traditional single-sided concrete support servo system used in large foundation pits in soft soil areas exhibits various challenges such as overlarge axial force loss and insufficient deformation coordination of the retaining structures on both sides of the support. Therefore, a case study is conducted on the expansion project of the Taihe Sewage Treatment Plant. Based on real-time axial force monitoring and finite element analysis results, the axial force transmission form of concrete support under the conditions of servo loading points arranged at both ends and servo loading at both ends is studied. A comparison is made between the axial force difference (along the support direction, between the front and rear of the joint) and the coupling beam shear force of the concrete support-coupling beam-column joint. The results indicate that the coupling beam has a limited impact on the axial force loss of the support along the support direction. Furthermore, based on derivation of theoretical formulas and fitting with measured data, a calculation method for the axial force transmission of supports in long-distance servo systems is proposed. The results are as follows: (1) The axial force loss reaches the maximum in the support middle under conditions of servo loading points arranged at both ends and servo loading at both ends. (2) The axial force loss of single-sided servo support is primarily affected by the support length, vertical spacing of supports, and compressive stiffness of the support. (3) The axial force transfer ratio decreases with increasing support length and decreasing support compressive stiffness; whereas it decreases first and then increases with increasing bending stiffness of the column and decreasing vertical support spacing. (4) The ratio between axial force variation at no-servo end to servo force variation is defined to be transferring rate of servo force variation. (5) Under a 50% transferring rate, the length of single-sided servo concrete support should not exceed 38.0 m.