富水砂卵石地层双层衬砌类圆形断面矿山法地铁隧道适应性研究

发布时间：2018-05-22 07:15

本文选题：富水砂卵石 + 矿山法　；参考：《铁道标准设计》2017年05期

【摘要】：针对富水砂卵石地层条件下矿山法隧道下穿既有地铁盾构隧道,首先从工期要求与既有工程经验方面进行总体方案设计,明确矿山法隧道近距离下穿既有隧道的优势;随后基于规范要求与富水砂卵石地层特性,提出施工变形控制标准;最后对初期支护+双层衬砌结构型式下的沉降变形、结构内力等进行深入分析,并与常规初期支护+二衬结构型式进行对比分析,明确双层衬砌结构型式的优势。研究结果表明:类圆形断面在减小隧道开挖轮廓与改善结构受力性能等方面具有明显优势,同时本工程双层衬砌构造型式,围岩荷载主要由二次衬砌承担,永久结构(三次衬砌)承担的荷载较小,永久结构在承载力与稳定性,尤其是安全储备方面具有明显的优势。
[Abstract]:In view of the underground shield tunnel under the condition of water-rich sand and pebble stratum, firstly, the overall scheme design is carried out from the requirements of the time limit and the existing engineering experience to make clear the advantages of the mine method tunnel passing through the existing tunnel at short distance. Then based on the requirements of the code and the characteristics of water-rich sand and pebble strata, the construction deformation control standard is put forward. Finally, the settlement deformation and structural internal force under the initial support double-layer lining structure type are deeply analyzed. The advantages of double-layer lining structure are determined by comparing and analyzing the two-liner structure type of conventional initial support. The results show that the quasi-circular section has obvious advantages in reducing the excavation profile of the tunnel and improving the mechanical performance of the structure. At the same time, the double-layer lining structure type of the project, the surrounding rock load is mainly borne by the secondary lining. The load of permanent structure (triple-lining) is small, and the permanent structure has obvious advantages in bearing capacity and stability, especially in safety reserve.
【作者单位】：中铁第一勘察设计院集团有限公司;
【分类号】：U231.3;U455.4

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