Stress Distribution Law of Shear Mortar for Synchronous Grouting during Shield Tunneling

盾构隧道的管片上浮作为施工过程中监测的重要部分，施工过程中的同步注浆过程，其压力影响和浆液的抗浮力影响着隧道上浮，直接关系到隧道施工与运营的安全性和稳定性。本文以基于固废的剪切型浆液为例，基于浆液性能实测数据、理论模型与数值模拟方法，研究了在黏性土中同步注浆中注浆压力和浆液抗剪影响下，浆液对隧道结构以及自身的应力分布规律。研究通过非牛顿流体的流变特性理论，分析了隧道施工过程中同步注浆浆液性能对于结构内力分布和变形的影响，探讨了剪切型砂浆中浆液性能参数对于隧道施工的影响。结果表明：(1) 剪切型砂浆的强度参数在隧道抵抗上浮中起着关键作用，泥浆的动力粘度与浆液的强度都有利抗浮；(2) 适当控制施工参数可以有效降低注浆过程中对于结构的扰动与上浮；(3) 数值模拟揭示了盾构隧道施工过程中同步注浆的压力分布规律，为优化注浆过程提供了重要依据。本文研究成果不仅为类似的隧道工程注浆系统设计与施工提供技术参考，还为浆液性能的优化与结构的长期上浮预测提供了理论基础。The floating of tunnel segments in shield tunneling is an important part of construction monitoring. During synchronous grouting in shield tunnel construction, monitoring tunnel uplift, as grouting pressure and the anti-buoyancy properties of the slurry significantly influence this uplift, directly affecting the safety and stability of tunnel construction and operation. This paper takes shear-type grout based on solid waste as an example. Based on the measured data of grout properties, theoretical models, and numerical simulation methods, it investigates the stress distribution patterns of the grout on the tunnel structure and within itself under the influence of slurry pressure and grout shear resistance during synchronous grouting in cohesive soil. By analyzing the rheological characteristics of non-Newtonian fluids, the study examines the influence of synchronous grouting grout properties on the internal force distribution and deformation of the tunnel structure during construction and explores the impact of grout property parameters in shear-type mortar on tunnel construction. The results show that: (1) The strength parameters of shear-type mortar play a key role in the tunnel's resistance to floating, with both the dynamic viscosity of the slurry and the strength of the grout contributing to anti-floating; (2) Proper control of construction parameters can effectively reduce the disturbance and floating of the structure during grouting; (3) Numerical simulation reveals the pressure distribution patterns of synchronous grouting during shield tunneling construction, providing an important basis for optimizing the grouting process. The research findings of this paper not only offer technical references for the design and construction of grouting systems in similar tunnel projects but also provide a theoretical foundation for the optimization of grout properties and long-term prediction of tunnel floating.