基于HVSR法的微动探测技术在富水砂卵石层地铁工程中的应用研究

Study on the Application of Micromotion Detection Technology Based on HVSR Method in Water-Rich Sand Pebble Layer in Stone Layer Subway Engineering

在自稳性差的高富水砂卵石复杂地层中进行地铁盾构法施工,不仅施工技术难度大,而且工程风险极高,为降低施工风险及施工成本,迫切需要在盾构施工前获取更全面、更精准的区域地质信息,传统地勘方法存在明显的不足与缺陷,难以提供全面、精准的地质信息。本文以成都地铁18号线一期工程土建2标为依托工程,针对成都富水砂卵石复合地层地质勘探问题,将基于H/V谱比法的微动探测技术引入传统地铁盾构施工项目,该技术能够最大程度地弥补地质信息盲区,进而帮助施工单位减小地铁盾构区间滞后沉降风险,降低盾构区间地勘施工成本,同时为今后类似地勘工程提供宝贵的经验。

In the poor self-stability of rich water sand pebble complex formation in underground shield construction, not only construction technology is difficult, but also engineering risk is high, to reduce the construction risk and construction cost, an urgent need before shield construction to more comprehensive and more accurate regional geological information, traditional geological exploration method has obvious deficiencies and defects, it is difficult to provide comprehensive and accurate geological information. In this paper, civil engineering Standard 2 of Phase I project of Chengdu Metro Line 18 is taken as the supporting project. Aiming at water-rich sand pebble composite formation geological exploration problems in Chengdu, the micromotion detection technology based on the H/V spectrum ratio method is introduced into the traditional subway shield construction project, the technology can maximize the geological information blind area, and help construction units reduce the risk of subway shield interval lag settlement, reduce the cost of shield interval geological exploration construction, and provide valuable experience for similar geological exploration engineering in the future.