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Half-spherical surface diffusion model of shield tunnel back-fill grouting based on infiltration effect

机译：基于渗透效应的盾构隧道回填灌浆半球形面扩散模型

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摘要

Studies on shield tunnel back-fill grouting often simplified soil and grout as homogeneous single-phase media and ignored the interactions between soil pores and solid-liquids in grouts, thus leading to inaccurate results. Using shield method construction characteristics as a basis, this paper presents a theoretical study on the diffusion mechanism of back-fill grouting, with a particular focus on the diffusion process of grout at the penetration stage. To this end, a half-spherical surface diffusion model considering the infiltration effect of back-fill grouting in shield tunnel construction was developed. The model was then used to derive formulae based on soil porosity and volume fractions of grout grains to determine distributions of grouting pressure and define a concept of effective grout diffusion radius. Finally, the relationship between the pressure applied to tunnel segments as a result of the back-fill grouting of the shield tunnel and the important factors was analysed using a case study comparing the presence and absence of infiltration. The results show that the total and per-unit-area pressure on tunnel segments from back-fill grouting of the shield tunnel are significantly affected by the infiltration effect. Grouting pressure was determined to be the cause of changes in segment pressure and pressure intensity.
机译：盾构隧道回填灌浆研究通常将土壤和灌浆简化为均匀的单相介质，而忽略了灌浆中土壤孔隙与固液之间的相互作用，从而导致计算结果不准确。本文以盾构法施工特性为基础，对回填灌浆的扩散机理进行了理论研究，重点研究了灌浆在注浆阶段的扩散过程。为此，建立了考虑回填灌浆在盾构隧道施工中渗透作用的半球形表面扩散模型。然后使用该模型基于土壤孔隙率和灌浆颗粒的体积分数得出公式，以确定灌浆压力的分布并定义有效灌浆扩散半径的概念。最后，通过案例分析渗透的存在与否，分析了盾构隧道回填注浆对隧道段施加的压力与重要因素之间的关系。结果表明，盾构隧道回填灌浆对隧道管段的总压力和单位面积压力均受渗透作用的影响。确定灌浆压力是分段压力和压力强度变化的原因。

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