无水漂卵砾石地层土压平衡盾构施工关键技术

Key Techniques for EPB Shield Construction in a Waterless Sandy Stratum with Cobbles and Boulders

文章以北京地铁九号线丰台东大街站—丰台北路站区间全断面无水漂卵砾石地层盾构掘进工程为背景,基于地质勘查资料和试验探井的分析结果,掌握了该漂卵砾石地层的空间分布规律和力学性质。在合理选用辐条式土压平衡盾构的基础上,通过对盾构机关键部件进行适应性改造,降低了刀盘刀具磨损。施工中通过掘进参数的有效选择,实现了该类型盾构机在全断面卵砾漂石地层中的长距离掘进。

Shield construction is was used for the Fengtai East Street Station-Fengtai North Road Station section of Beijing Subway Line 9, which is located in a waterless stratum with gravel, cobbles, and boulders. Based on the geological investigation and related data from an exploratory well, the spatial distribution and mechanical properties of the gravel, cobble, and boulder stratum are understood. Wear of the cutterhead and cutting tools is reduced by adaptability improvements to key parts of the EPB shield with a spoke-type cutterhead. By determining appropriate parameters for shield tunnelling, the long-distance full-face tunnel drive in waterless sandy stratum with cobbles and boulders was completed.