基于理论预测模型的盾构同步注浆数字化施工

Digital Construction of Shield Synchronous Grouting Based on Theoretical Prediction Model

针对砂性富水地层盾构隧道开挖环状间隙土体稳定性差、同步注浆渗透扩散具有不确定性、扰动状态控制困难等问题,在建立同步注浆渗透距离预测模型和方法的基础上,根据盾构施工特点,研究建立了设计指标控制下同步注浆参数理论初选、盾构原位试推、监测数据反馈检验并融合工程类比、盾构姿态数据和扰动位移第三方监测数据的盾构同步注浆全过程数字化施工与风险预控方法,有效实现注浆施工风险的事前预测、参数适用性的试推检验和后续工序的可靠性分类评价。研究成果在南通地铁工程中示范应用,取得良好的技术效果。

Aiming at the problems of poor soil stability in the annular gap of shield tunnel excavation in sandy water rich stratum,uncertainty of synchronous grouting penetration and diffusion,and difficulty in controlling the disturbance state,on the basis of establishing the prediction model and method of synchronous grouting penetration distance,according to the characteristics of shield construction,the digital construction and risk pre-control method of the whole process of shield synchronous grouting is studied and established,which includes the theoretical primary selection of synchronous grouting parameters under the control of design indexes,shield in-situ trial push,monitoring data feedback test,and the integration of engineering analogy,shield attitude data and disturbance displacement third-party monitoring data.The research are demonstrated and applied in Nantong metro project and good technical results are achieved.