氮冻结加固技术具有速度快、强度高等优点,是进行工程抢险和应急处置的重要手段。本文以广州白云国际机场三期扩建工程中顶管机脱困为背景,对液氮冻结加固技术的方案设计、施工关键技术及其应用效果进行了研究。研究针对自身工程特点提出了含金属杂物地层的钻头预估方法、顶管机温控技术措施和冻胀变形控制措施三项关键技术措施,从而保证钻进过程未出现钻头突然失效问题,并将最大冻胀变形控制在3 mm内。此外通过对冻结加固体不同深度、不同位置测温孔数据的分析,指出了液氮冻结加固的不均匀性,并明确对于液氮冻结加固工程必须采用多断面温度场综合评价的方法进行冻结效果判定。相关研究成果为类似工程开展可以提供参考依据。
Liquid nitrogen reinforcement technology is characterized by several distinct advantages, including high freezing velocity and high strength, rendering it an essential method for engineering accident rescue and emergency response. This article examines the escape of the dolly-mounted jack during the third phase expansion project of Guangzhou Baiyun International Airport. The design of the scheme, critical construction technologies, and the application effects of liquid nitrogen freezing reinforcement technology was introduced. The study proposes three critical technical measures to the rescue engineering characteristics: a drill bit prediction method for strata containing metal debris, temperature control measures for the dolly-mounted jack, and frost heave deformation control measures. Which ensure that no sudden bit failure occurs during drilling, and the maximum frost heave deformation is controlled within 3 mm. Furthermore, the analysis of temperature measurement data from various depths and positions of the frozen reinforcements highlights the unevenness of liquid nitrogen reinforcement technology. It emphasizes the necessity of employing a comprehensive evaluation method of multi-section temperature fields for liquid nitrogen reinforcement projects. The findings of this research can serve as a valuable reference for similar future projects.
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