【摘要】 盾构切桩过程中，合理的切桩推力和施工控制措施能有效控制桥桩变形，保障切桩过程的稳定与安全.依托北京地铁12号线某盾构切桩工程，基于摩尔-库仑强度理论，推导稳态切削时双面刃撕裂刀平直段的贯入力；由刀具表面接触应力分布建立稳态切削时双面刃撕裂刀圆弧段的贯入力模型.结合盾构切桩全过程数学模型，得到盾构切桩总推力计算方法，根据现场实测推力值验证盾构切桩总推力模型，分析纯切桩推力对桩基变形的影响；将纯切桩推力计算方法应用到智能管控平台搭建，配合盾构切桩过程中的控制措施，对桥梁墩台进行变形监测.监测结果表明：盾构左线切桩过河区间中桥梁墩台的最大竖向沉降为8.48 mm，桥梁墩台的最大横向差异沉降为1.4 mm，均在安全控制范围内.更多还原

【Abstract】 During the construction of shield cutting piles, reasonable thrust force and control measures can effectively control the deformation of bridge piles, ensuring structural stability and construction safety. Based on a cutting pile project of Beijing Metro Line 12, the penetration force of the straight section of the double-edged ripper during steady-state cutting is derived based on the Mohr-Coulomb strength criterion. The penetration force model of the arc segment of the double-edged ripper is established based on the contact stress distribution on the cutter surface. The penetration force of the ripper is combined with the mathematical model of cutting pile to obtain the calculation method for the total shield thrust force. The total thrust model is validated based on the measured thrust values on site, and the effect of the thrust force on the deformation of the pile foundation is analyzed. Furthermore, an intelligent management and control platform is built based on the calculation method of the thrust force acting on the pile. The platform and construction control measures are applied to the cutting piles project, and the bridge settlement is simultaneously monitored. The monitoring results show that the maximum vertical settlement of the bridge piers and abutments in the cross-river section during cutting piles is 8.48 mm, and the maximum lateral differential settlement is 1.4 mm, respectively, both within the safe control range.更多还原