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Effect of the excavation clearance of an under-crossing shield tunnel on existing shield tunnels

机译：穿越式盾构隧道开挖间隙对现有盾构隧道的影响

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摘要

The excavation by earth pressure balance (EPB) shield could cause stress fields varied, which is harmful to adjacent existing structures. Thus the effect of excavation clearance of the EPB shield on the settlement of existing structures should be taken into account. The transit tunnel from Meicun to Shangmeilin of Shenzhen Metro Line 9 constructed by the EPB shield with mid-shield-grouting was investigated. The deformation of existing tunnel is analysed by three-dimensional (3D) finite element methods (FEM). It is found that the settlement of overburden soil is obviously influenced by the structure of the existing tunnels through the plastic development of the soil. The rate of settlement is remarkable when the shield effect zone approaches the existing tunnels so that timely mid-shield grouting is an efficient method of controlling the settlement induced by the excavation clearance. However, the grout used in this method should be with the properties of short hardening time, large elastic modulus and low shear strength. Different standards of settlement control should be employed with respect to different underground tunnels, in which minimum elastic modulus of the filler that is usually determined by fitting function. This can be taken as a guide rule of the selection of material parameters in the project. The simulation results are in good agreement with the settlements measured for the existing tunnels and the ground surface. The parameter sensitivity analysis by means of the Spearman's correlation coefficients shows that the elastic modulus of filling material significantly influences on the settlement of the existing tunnels and the ground surface.
机译：土压平衡（EPB）盾构的开挖可能导致应力场变化，这对相邻的现有结构有害。因此，应考虑到EPB防护罩的开挖间隙对现有结构沉降的影响。研究了由中盾构灌浆的EPB盾构深圳地铁9号线梅村至上梅林的过境隧道。现有隧道的变形通过三维有限元方法（FEM）进行分析。研究发现，通过土壤的塑性发育，覆盖隧道的沉降明显受到现有隧道结构的影响。当盾构效应区接近现有隧道时，沉降速度非常显着，因此及时进行盾构中间注浆是控制开挖间隙引起沉降的有效方法。但是，该方法中使用的灌浆应具有硬化时间短，弹性模量大和剪切强度低的特性。对于不同的地下隧道，应采用不同的沉降控制标准，其中填料的最小弹性模量通常由拟合函数确定。这可以作为选择项目中材料参数的指导原则。模拟结果与现有隧道和地面的沉降量非常吻合。利用Spearman相关系数进行参数敏感性分析表明，填充材料的弹性模量显着影响现有隧道和地面的沉降。

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